Tech Briefs Magazine - December 2022 - BET18
Light Electric Vehicles
This feature enhances the user experience
and helps the user to track battery parameters
accurately. Figure 1 shows a smart
gauge that can display battery parameters
such as SOC, voltage, current, time-toempty
etc. over various screens. The figure
has 100 percent as the SOC, 51.1V as the
battery pack voltage and 10 hours and 01
minute as the time-to-empty.
Another option is to use the existing
gauge in the vehicle that works with a
lead-acid battery, without replacing it
with a smart gauge. This avoids the additional
cost of the smart gauge but requires
a different interface between the
Li-ion battery and the gauge.
Power Tripping
The main functionality of a BMS in a
Li-ion battery is protection. The protection
includes cell over voltage, cell under
voltage, over current and over/under temperature.
The BMS monitors the current,
cell voltages and cell temperature to
identify a faulty situation and activates
protection. This process may end up cutting
the connection between the cell
stack and the pack terminals, which would
result in a tripping of power to the vehicle.
This does not happen if using a leadacid
battery pack and presents a critical
safety hazard as the user could get stuck
in a busy intersection or lose braking capability
while riding down a hill. Certain
LEVs have a safety interlock that applies
the full brake when the battery pack terminals
lose power. This is a critical safety
hazard for the riders in the vehicle.
While retrofitting an LEV with Li-ion
battery pack, care must be taken to
avoid sudden tripping of battery power.
The battery pack needs to account for
the safety hazards that
could result
from power tripping. There are multiple
design considerations to be applied
which solves the above problems and
ensures a smooth and safe operation of
the vehicle.
Li-ion batteries are enhancing the
user experience of golf carts and other
LEVs by providing longer run times, a
maintenance-free solution, and a more
reliable user interface. When choosing to
replace lead-acid batteries with a higher
performing, more sustainable, and intelligent
battery technology like Li-ion, the
key is to ensure the battery being installed
has been designed, manufactured,
and tested to perform to the application's
requirements. Consider asking
your battery manufacturer how their
batteries have been designed to handle
charging, regeneration, a vehicle's user
interface, and power tripping.
This article was written by Anvin Joe
Manadan, Technical Lead, Inventus Power
(Woodridge, IL). For more information,
visit www.inventuspower.com.
+1 262-372-2165 | tlxtech.com
18
Battery & Electrification Technology, December 2022
http://www.inventuspower.com
http://info.hotims.com/82328-708
Tech Briefs Magazine - December 2022
Table of Contents for the Digital Edition of Tech Briefs Magazine - December 2022
Tech Briefs Magazine - December 2022 - Intro
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