General Description
5
SLOU471E – May 2017 – Revised April 2019
Copyright © 2017–2019, Texas Instruments Incorporated
BQ79606A-Q1 Evaluation Module
1
General Description
TI's
BQ79606EVM Battery Management System
(BMS) is an evaluation board of the
BQ79606A-Q1
device for use in large format lithium-ion batteries that provide monitoring, balancing, and
communications. Each BQ79606EVM can manage up to 6 cells (30-V max) for Li-ion battery applications.
Up to 64 BQ79606EVM modules can be stacked, for packs up to 1300 V. The system provides fast cell
balancing, diagnostics, and module to controller communication. Independent protection circuitry is also
provided. Please see the BQ79606A-Q1 data sheet for more details.
The BQ79606EVM is equipped with precision measurement and synchronous communication to enable a
master controller to perform
State of Charge
(SOC) and
State of Health
(SOH) estimation. Highly-accurate
cell voltages and a fast sampling time for the entire battery pack allows more efficient operation of battery
modules and more accurate SOC and SOH calculations. Communication with stacked BQ79606EVMs is
via an isolated daisy-chain differential bus.
Control a single EVM or multiple stacked BQ79606EVMs using a PC-hosted GUI. Communication
between the PC and the lowest in a stack of BQ79606EVMs is via an FTDI USB-to-TTL (5 V) serial
interface cable. Communication between all other EVMs in the stack is via the isolated, daisy-chain
differential communication bus. The PC GUI allows configuration of the BQ79606EVMs to monitor cells
and other analog data channels, control balancing, and monitor details of any faults.
1.1
Key Features
This EVM includes the following features:
•
Passive cell balancing
•
Isolated communications (1 kV)
•
Flexible architecture for up to 6 cells
•
UART interface
•
High-accuracy cell voltage measurement
•
Diagnostics
•
Resistor ladder to simulate cell voltages
1.2
Key Electrical Parameters
The following table identifies the key electrical parameters:
Maximum battery pack voltage (stacked EVMs)
1300 V
Maximum operating voltage
30 V
Minimum operating voltage
5.5 V
Maximum cell open circuit voltage
5 V
Ambient temperature
–40 ºC to 105 ºC
Nominal operating temperature
–20 ºC to 60 ºC
Cell balancing current
Approximately 100 mA