4S Lithium-Ion BMS Design

flux

The 1 kΩ sense resistors are now in the schematic and placed beside U1. I’m cleaning stale routing on the affected nets before running the router again.

flux

Implemented the approved RC filter fix.
What changed:
  • Added RVC1–RVC4, each 1 kΩ, in series with the four BM3451 cell-sense inputs.
  • Rewired the sense inputs so B1–B4 raw taps feed filtered VC2–VC5 nodes through the new resistors.
  • Kept the existing 1 µF CVC1–CVC4 capacitors on the filtered side, completing the intended 1 ms RC input filters.
  • Placed RVC1–RVC4 next to U1 in the cool logic zone.
  • Removed stale routing on the modified nets and re-ran the autorouter.
  • Cleaned the overlap and dangling-trace issues introduced during rerouting.
Final audit:
  • ERC: no open errors/warnings in the checked categories.
  • DRC: no overlapping copper, invalid layers, dangling traces, missing footprints, or protected-intrusion errors.
  • Remaining: 2 airwire errors still remain, tied to the same auto-generated fill/stitching artifact seen previously. The normal component routing for the updated RC filter paths has been completed, but the project is still not formally “zero-DRC” until those fill-related airwire artifacts are resolved or accepted.
Fix airwire artifacts
Verify RC routing
Check isolation barrier
Run manufacturability review
Prepare export package
Sign up to send
B1 P1 - U1 P3.5/TA0.1
RT1 1 - U1 P3.1/TA1.0
RBAL1
Resistance
75 Ω
RBAL3 P2 - Q3 D
RBAL2
Resistance
75 Ω
RBAL3
Resistance
75 Ω
B3 P1 - U1 TDO/TDI/UCB0SIMO/UCB0SDA/A7/P1.7
RBAL1 P2 - Q1 D
B2 P1 - U1 P3.7/TA1CLK
RBAL2 P2 - Q2 D
RTRH P1 - U1 P3.0/TA0.2
RT1
RT1 2 - RTRH P2
  • Generic Inductor
    Generic Inductor
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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.

Pricing & Availability

Distributor

Qty 1

Arrow

$0.26–$1.32

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$1.06–$16.98

HQonline

$0.03–$0.22

LCSC

$0.52–$0.75

Mouser

$1.96

TME

$0.00

Verical

$0.21–$0.97

Controls