Assemblies of the IEP
This block diagram shows the principal assemblies of the battery pack.
1
Integral pre-charge
2
Relay monitoring
3
Current monitoring
4
Temperature monitoring
5
Integral heater
6
Cell balancing
7
SOC calculation
8
CAN interface
9
Short circuit protection (fuse)
10 Lithium-ion cells
11 Inputs
12 Main connector
3.3 Functions
Integrated precharge
Precharge: The BAT+ relay is bridged with a 2 Ω resistance. This produces current ow charging the
capacitors in the connected consumers, e.g. an inverter. When current ow undershoots the preset
maximum at the end of the precharge phase, the BAT+ relay closes and precharging ends.
Default parameters
■
Precharge time: 0.65 s
■
Current at end of precharge time: < 2 A
These parameters may be changed without notice during series production or be changed to match
customer requirements.
DAMAGE
■
The lower the current at the end of the precharge time, the lower also the wear on the relay contacts.
■
No more than 10 precharge operations may be performed or attempted within 10 minutes.
Two factors affect residual current at the end of the precharge time:
1. The connected capacity value. Experience has shown that the precharge facility’s design can handle
the reasonably expectable capacities.
2. Continuous current I
DC
at the end of the precharge time.
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B 6130 - 02-2022 - 1.0en
HAWE Hydraulik SE
