Battery & Electrification Technology - May/June 2024 - 17

GLOBAL EV BMS MARKET FORECAST,
SPLIT BY VEHICLE ELECTRIFICATION TYPE - IN B$
Source: Battery Management System (BMS) for Electric Vehicles report, Yole Intelligence, 2023
14
12
10
8
6
4
2
2018
2019 2020 2021
2022
2023
PHEV BEV
Figure 2: The BMS market is expected to see significant growth over the next decade. Plug-in EV = plug-in hybrid electric vehicle (PHEV) +
battery electric vehicle (BEV). (Image: Yole Group)
address more comprehensibly through
rigorous testing of BMS.
The Impact of More Accurate
and Functional BMS
The BMS is a system for monitoring EV
battery performance to ensure safety and
reliability, and to maximize range. The
BMS controls charging and balancing the
charge on individual cells within a battery
pack and integrates a multitude of
semiconductors. Its multi-channel battery
monitoring and balancing system ICs
manage cell voltage, current, and temperature,
to determine the state of charge
(SoC) and health of the entire battery
pack. These devices may be wired or
wireless, communicating the information
they gather to a central processing unit,
which, for example, displays the battery
status to the driver or sends alerts or
warnings. The BMS market is expected to
see significant growth over the next decade
(Figure 2).
Battery packs are comprised of multiple
cells. For ideal performance, the BMS
must manage the charge and monitor
the state of charge for each cell individually.
The BMS must also manage temperature
fluctuations and the health of
the entire battery stack, where batteries
of various voltages are stacked on top of
one another.
Better Battery Management
Systems Improve EV Range
Can a better BMS help alleviate range
anxiety? There is reason for optimism.
By providing a more precise measurement
of the vehicle's charge status, an
improved BMS enhances battery utilization.
This, in turn, extends the driving
range and improves estimates, instilling
greater driver confidence.
Battery & Electrification Technology, May/June 2024
Improved BMS monitor accuracy aids
battery pack performance, allowing the vehicle
to manage its charge and discharge
cycles more efficiently, ultimately resulting
in extended battery life. In a cascade of
benefits, this stands to open up additional
driving miles, thus granting drivers greater
mileage with fewer charging stops.
For instance, if the accuracy of measuring
the SoC is increased, then the usable
battery energy is also increased. SoC is
determined by measuring the voltage
across the cell, so accurate voltage measurement
is crucial to obtaining an accurate
figure for SoC.
A typical cell might need to be kept
between 10 percent and 90 percent of its
theoretical capacity, giving a usable energy
of 80 percent. If the BMS has an error
rate of +/-1 percent, the practical limits
will be 11 percent and 89 percent, and
usable energy is therefore 76 percent,
17
2024
2025
2026
2027
2028
Plug-in EV BMS (B$) 2022-2028 CAGR: 15.6%

Battery & Electrification Technology - May/June 2024

Table of Contents for the Digital Edition of Battery & Electrification Technology - May/June 2024