3.14. ADD switch dip function:
ADD is applicable to modules connected in parallel. ADD consists of four
binary bits. Detailed information is shown in Fig 3.2.
Fig. 3.2 ADD switch dip
Up to 16 batteries can be connected in parallel with the max deviation of
current should be 40A and total charge/discharge current for the whole string
must be in below range:
✓ 1 module: 1C (max.100A);
✓ 2~5 modules: 0.5C (max.100A~max.250A)
✓ 6~8 module: 0.3C (max.180A~max.240A)
✓ 8~10 module: 0.2C (max.160A~max.240A)
✓ 10~16 module: 0.2C (max.160A~max.240A)
The new batteries also can be connected with old batteries (different SOH)
then properly work if the below conditions are met:
✓ Same nominal voltage and capacity (48V100Ah)
✓ Same cell material (LFP)
✓ Maximum 3 old batteries when 10 batteries in total.
✓ Old modules have been in use for no more than 1 year.
Note: This scheme is just based on theoretical calculation. With this
configuration, the life time of new batteries will be affected. Moreover, the
capacity of new batteries is less than nominal because they can only be
discharged the capacity as old ones, can not full discharge themselves.
3.15. Dry contact function:
Two pcs of normal close dry contact:
• Failure Alarm: Indicate BMS or battery fail including but not limited to charge and
discharge MOS fail, cell voltage under 1.75V, module voltage under 26V, NTC
disconnect.
• Fault Alarm: Output short circuit, charge and discharge over current, charge and
discharge over temperature/low temperature, polarity reverse, battery shutdown
To Next Page
Loading...
