20S 72V 40A Li-ion Battery BMS Module Battery Charger Protection
Board for EV Industrial Equipment
The BAKTH-021S100A-0019-01 is a high-voltage, industrial-grade
protection board exclusively optimized for 20-cell series (20S)
lithium battery packs—supporting Li-ion chemistries—with a maximum
discharge current of 40A. While its model code includes “021S”
(indicating broad design compatibility) and “100A” (denoting
extended current handling potential), it is fine-tuned for 20S
configurations (nominal voltage: 74V for Li-ion) and calibrated to
deliver stable protection for 40A medium-to-high power
applications. This makes it an ideal choice for high-voltage
devices like electric mobility gear, industrial tools, and
mid-scale energy storage systems.
20S-Specific Protection & 40A High-Current Safeguards
Tailored to address the unique risks of 20-cell high-voltage packs,
the board delivers multi-layered protection aligned with 20S
dynamics and 40A discharge demands:
- Overcharge Protection: Triggers at 4.25V (Li-ion) per cell, instantly cutting charging
current to prevent thermal runaway—critical for 20S packs where
cumulative voltage (up to 85V fully charged for Li-ion) amplifies
overcharge hazards.
- Undervoltage Protection: Shuts down discharge at 2.5V (Li-ion) per cell, avoiding
irreversible capacity loss from “weak cells” that can disable the
entire 20S system, especially during 40A high-load operation (e.g.,
electric motor startup).
- 40A Overcurrent & Short-Circuit Protection: Blocks currents exceeding 40A (max discharge) or 120A (peak
surge), shielding the 20S pack and connected devices (e.g.,
heavy-duty e-scooters, industrial grinders) from burnout during
sustained high-power use.
- 20-Cell Active Balancing: Automatically equalizes voltage across all 20 cells during
charging, eliminating uneven charge distribution—a persistent
challenge in high-cell-count packs. This extends the 20S pack’s
lifespan by up to 40% compared to unbalanced systems and maintains
consistent 40A discharge performance.
About Us
Shenzhen BAKTH Technology Co., Ltd. was established in 2002. For 21 years, we've specialized in
battery pack assembly and PCM/BMS design and production. Our
5,000-square-meter factory features automated production lines and
SMT assembly capabilities.
Certifications
FAQ
What kind of certificate your battery pack owned?
ISO9001, ISO14001, UL, BIS, KC, USTC, CE, CB - our battery packs
have reliable quality assurance.
Do you have MOQ?
No limitation - we offer competitive pricing based on order
quantity. Sample orders are welcome to test our quality before bulk
orders.
What's the warranty? How can we guarantee quality?
Standard warranty is 12 months (negotiable for special products).
Our complete production process ensures quality before shipment.
What's the lead time?
Standard products: 3-4 weeks for samples (depending on cell
availability), 5-8 weeks for bulk orders (varies by model and
quantity).
Can we have our own Logo on the battery pack? Can you accept
customized battery?
Yes - our professional R&D team can provide customized
solutions according to your requirements.
