4S Lithium-Ion BMS Design

I could not get the final localized DRC to 0 airwires with the available routing flow.
Completed:
  • Preserved the clean 297 mm × 37 mm board, center slot, and all 8 M6 holes.
  • Re-ran localized DRC.
  • Nudged the B1/B2/B3 monitoring/filter area:
    • Spread B1/B2/B3 terminals.
    • Repositioned RVC1–RVC3 and CVC1–CVC3 to open routing channels.
    • Specifically fixed the blocked RVC1 P2 escape condition.
  • Deleted stale/overlapping local trace fragments around the RVC cluster.
  • Ran autoroute, then a cleanup autoroute pass.
  • Final localized DRC shows 0 overlapping copper errors.
Remaining:
  • 4 airwire errors still remain.
    • 3 are persistent B1/B2/B3-related route failures.
    • 1 remains tied to the auto-generated fill/stitching artifact.
  • 13 dangling-trace warnings remain after the second routing pass.
The board is improved and overlap-free, but it is not yet manufacturing-clean. The remaining items need true manual trace editing/stitch placement or a more capable scoped routing/manual copper tool rather than another autoroute pass.
Simplify placement
Document blockers
Check manufacturability
Adjust terminals
Export review package
B1 P1 - U1 P3.5/TA0.1
ISO_CO CA - U1 TA1.1/P2.1
RT1 1 - U1 P3.1/TA1.0
RBAL1
Resistance
75 Ω
B3 P1 - U1 TDO/TDI/UCB0SIMO/UCB0SDA/A7/P1.7
RBAL3 P2 - Q3 D
RBAL2
Resistance
75 Ω
RISO_DO P1 - U1 TA1.1/P2.2
RBAL3 P2 - Q3 D
RVC1 P2 - U1 P3.7/TA1CLK
RDO
Resistance
2000 Ω
B2 P1 - U1 P3.7/TA1CLK
RBAL4 P2 - Q4 D
RBAL3
Resistance
75 Ω
B3 P1 - U1 TDO/TDI/UCB0SIMO/UCB0SDA/A7/P1.7
RBAL4
Resistance
75 Ω
RBAL1 P2 - Q1 D
RVCC P2 - U1 DVCC
B2 P1 - U1 P3.7/TA1CLK
RBAL2 P2 - Q2 D
RBAL4 P2 - Q4 D
RTRH P1 - U1 P3.0/TA0.2
Q3 G - U1 ~{RST}/NMI/SBWTDIO
RTRH
Resistance
7000 Ω
RCO
Resistance
10000000 Ω
Q4 G - U1 TEST/SBWTCK
Q4 G - U1 TEST/SBWTCK
B4 P1 - RVCC P1
RCO P2 - ISO_DO CA
RT1
RT1 2 - RTRH P2
RT1 2 - RTRH P2
RCO P2 - ISO_DO CA
Q4
Q3


No results...

Prius 4S BM3451 BMS uUHq thumbnail
Custom 4S CATL NCM module BMS/CMU sampling and passive balancing board for a Toyota Prius hybrid battery retrofit using BM3451SMDC-T28A with isolated CO/DO fault outputs and M4 sense studs.

Properties

Properties describe core aspects of the project.

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