Automotive Engineering - October 2021 - 19

COVER STORY
BYD Blade battery cycle life - capacity recovery rate when charging or driving, at various temperatures.
Blade pack-strength CAE. A crush force of 800 kN was applied;
only deformation was observed, no smoke or fire. The pack can
sustain a compressive force of 445 kN, according to BYD.
Test results showing thermal stability comparison of BYD's LFP chemistry vs. NCM.
thermal management, usually liquid cooling. BYD uses a special thermally-conductive
adhesive between the cooling system and the cell
stack. The third layer from the top is the cell stack. Protective plates
are integrated with the battery's aluminum housing.
" It's a robust design; a lot of cross bars, bus bars. The BDU and
BMS [battery disconnect unit and battery management system] are
included; we do the integration, " he said.
BYD uses the Blade battery in its new-for-2021 Tang electric SUV and
in its Han EV sedan, among other vehicles. During development, the
Blade battery was subjected to a new series of stringent tests, Dr. Chen
said. Neither a 300°C furnace test or a 260% overcharging test resulted
AUTOMOTIVE ENGINEERING
in any indication of fire or explosion. During a nail-penetration
ballistics test, the Blade battery's surface temperature
remained with a 30°C-to-60°C range without
any smoke or fire. And the battery successfully sustained
repeated 80-Hz vibration attenuation, Dr. Chen said.
According to BYD, the Blade battery exceeds 1.2
million km after 3,000 charge/discharge cycles. The
new Tang SUV delivers a range of 505 km (NEDC; 313
mi.) on a single charge, BYD claims, with 0-100 km/h
acceleration of 4.6 seconds. Tang's battery has demonstrated
a recharge capability from 30% to 80% of
full SOC in 30 minutes, on 110-kW DC.
BYD is moving to become an EV parts supplier under
the 'FinDreams' brand, which will include
FinDreams Battery, FinDreams Powertrain, etc., said
Dr. Chen. Beyond mobility applications, he believes
BYD's Blade battery has " significant market potential "
in energy storage and various infrastructure/grid applications
such as solar and wind buffers, which " have
become huge business for us, " he said.
BYD has eight manufacturing locations across China
that are either already or will be available to produce
the Blade battery, with a current production capacity
of about 70 GWh, Dr. Chen noted.
October 2021 19

Automotive Engineering - October 2021

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