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BP-LFP-1375
4.5 Deep discharge
The BMS switches to SHUTDOWN mode with particularly low self-consumption as soon
as the cell voltage is below the limit. The MOSFETs and the BMS are turned off to protect
the cells from deep discharge.
Abbreviation
Description / Condition
Limits
Shutdown Voltage
If a cell voltage is below the limit, BMS turns
into shutdown mode after shutdown time has
elapsed.
2.5 V
Shutdown Time
Timer for shutdown mode.
255 s
Abbreviation
Description / Condition
Limits
PF Shutdown
Voltage
If a cell voltage is below the limit for the time
defined in the parameter PF Shutdown Time,
the BMS turns into a permanent error state
after expiration. A charging process is then
no longer possible. The core pack is deeply
discharged.
1.5 V
PF Shutdown Time
Timer for PF shutdown voltage.
120 s
4.6. SMBus
Various data of used balancer IC are available via SMBus. This is integrated into two-wire
SMBus V1.1 standard. IC used: TI bq40z50-R1
(Technical documentation of IC at www.ti.com)
5. Discharging process
During discharge process, the pack voltage drops from the end-of-charge voltage (100%
SoC) to end-of-discharge voltage (0% SoC). Depending on current, the remaining capa-
city decreases continuously. If the battery management system detects an error, it will be
shut down as described in Section 'Functionality of BMS'.