Automotive Engineering - May 2022 - BET8

Ultracapacitor Solutions
Ragone Plot: BCAP3000 & BCAP0325
10
t = 5 s
t = 2 s
t = 1 s
1
1,000
10,000
Power Density [W/kg]
Maxwell BCAP3000 cell and Ragone Plot. (Photo: UCAP Power/Maxwell Technologies)
BCAP3000
BCAP0325
bursts of power in the seconds time frame
over many hundreds of thousands of cycles.
Ultracapacitor Technology
Compact in size, ultracapacitors can deliver
much higher peak power compared to
batteries and store an incomparably higher
amount of energy than conventional capacitors.
Ultracapacitors
from Maxwell
Technologies offered under the trademark
DuraBlue, for example, currently are available
on the market in larger cylindrical-format
cells with capacitance up to 3000
Farads. These cells incorporate advanced
shock and vibration technology and when
combined with Maxwell's patented electrode
formulation and manufacturing process,
result in a product line specialized for
the most demanding requirements of the
transportation industry.
For applications requiring a smaller
form factor, Maxwell has developed a
325F cell, the BCAP0325. A high-power
cell with ultra-low Equivalent Series
Resistance (ESR), it is ideally suited for
automotive applications. The cell is AECQ200
qualified and provides one of the
longest lifetimes available in the industry.
Feature and performance metrics include:
* Small (33 mm) form factor
* 1 million cycle capability
* PCB mountable
* Compliant to UL, RoHS and REACH standards
Safety-Critical X-by-Wire
Applications of Distributed
Power Modules
An electrical system architecture with
modular and distributed power modules is
one method of addressing the need for
Vehicle System Controller
power and redundancy required by the safety-critical
and security systems in automotive
applications. Distributed ultracapacitor
modules alleviate electrical distribution
system voltage sag and transients by supplying
peak power locally, while requiring
only the average power from the vehicle's
primary power supply. This essentially decouples
the high transient power load from
the vehicle's primary power supply system.
A further requirement of safety-critical
applications is the necessity of redundant
power supply in the event of loss of the
main electrical distribution system branch
circuit for x-by-wire functions. Distributed
power modules located at critical loads,
such as electric power-assist steering system,
offer the vehicle designer additional
redundancy for safety-critical applications.
As outlined above and prevalent in the
Electronic Power
Assist Steering
Steering
Actuator
Electronic Power
Assist Braking
Brake
Actuator
Engine
ETC, Fan,
Water Pump
Gear Sel, L/U
Clutch, Oil Pump
UC
ECU
Mtr
Steering
wheel
HCU
UC
ECU
Brake Pedal
Mtr
UC
ECU
Accel Pedal
Throttle
Body
Distributed module architecture for vehicle safety-critical and hybrid functionality. (Photo:
UCAP Power/Maxwell Technologies)
8
Distributed Ultracapacitor
Energy Storage Modules
=
=
ECU
ISG/BEV
Subsystem
ISG Torque
Energy Storage
System Mgmt.
SOC, SOH,
Vsys
Transmission/
Gearbox
Continuous,
Scheduled,
Selectable
Other Voltage
Loads
market today, ultracapacitors are an excellent
tool for vehicle engineers to specify
in support of high-power, short-duration
loads. With their extremely fast
charge and discharge capabilities, unmatched
cycling durability, wide operating
temperature range, long lifetime and
environmentally friendly design, ultracapacitors
offer many benefits in a small,
lightweight package. Maxwell
TechUC
HVAC
High
Voltage
Battery Primary
Storage
Electric Air
cond. comp.
UC
nologies' line of DuraBlue and AEC-Q200
qualified ultracapacitors are ideally
suited to meet these demands.
This article was written by Troy Brandon -
GM, VP Marketing, and David Wright - VP
Engineering,
UCAP
Power,
Maxwell
Technologies (San Diego, CA). For more info
visit http://info.hotims.com/82321-422. 
Battery & Electrification Technology, May 2022
Energy Density [Wh/kg]

http://info.hotims.com/82321-422

Automotive Engineering - May 2022

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