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Battery Management Systems (BMS)
2 Product Series · 6 Models available
The battery management system is the safety and intelligence layer of every storage battery. QDTB BMS products implement a scalable three-level architecture — cell module (BMU), cluster (BCU) and system/container (BAU) — that samples every cell's voltage, temperature and current, estimates SOC and SOH in real time, and enforces protection against over-charge, over-discharge, over-current, short-circuit and over-temperature. Active or passive balancing keeps cells matched so the pack delivers its full rated energy over thousands of cycles. CAN and RS485/Modbus interfaces relay state to the PCS and energy management system, closing the control loop for safe, efficient operation.
Specifications Range
All specifications and dimensions can be customized upon request
| Key parameters | Model Range |
|---|---|
| Cell Type | LiFePO4 |
| Cells in Series | 8–24 |
| Voltage Accuracy | 3 mV, 2 mV |
| SOC Accuracy | 5 % |
| Balancing | Passive 50~300mA, Active 1~5A |
| Communication | CAN, RS485/Modbus, CAN, RS485/Modbus, Ethernet |
Available Series
BMS-Home
→BMS-Home Series — Compact Cell Monitoring for Residential Packs
Compact BMS boards monitor 8–16 series LiFePO4 cells in wall-mount and rack-mount home batteries, with SOC estimation and full protection in a small footprint.
BMS-Cluster
→BMS-Cluster Series — Cluster & System-Level Management
Cluster-level BMS controllers aggregate multiple packs and coordinate with the PCS and EMS, forming the BCU and BAU layers of large storage systems.
Application Scenarios
Residential Batteries
Compact BMS boards that monitor 8–16 series cells in wall-mount home batteries.
Commercial Battery Clusters
Cluster-level controllers that aggregate and balance many packs in a rack or cabinet.
Containerised BESS
Three-level BMS spanning cells, clusters and the whole container for utility-scale safety.
Backup & Telecom
BMS with black-start and UPS functions for critical and telecom batteries.
EV & E-mobility Packs
High-accuracy cell monitoring suited to traction and light-electric-vehicle packs.
Second-Life Batteries
SOH tracking and balancing that extend the useful life of repurposed cells.
Technical Advantages
Three-Level Architecture
BMU / BCU / BAU hierarchy scales cleanly from a single pack to a container of clusters.
High-Accuracy Sampling
Millivolt voltage, percent-grade current and degree-grade temperature measurement per cell.
SOC / SOH Estimation
Adaptive algorithms keep state-of-charge and state-of-health accurate across the cell's life.
Multi-Layer Protection
Hardware and software guards against over-charge, over-discharge, over-current and thermal runaway.
Frequently Asked Questions
What does a BMS actually protect against?
It continuously guards against over-charge, over-discharge, over-current, short-circuit and over-temperature, and isolates the battery before any condition becomes dangerous.
What is the three-level architecture?
BMU monitors individual cells, BCU manages a battery cluster, and BAU coordinates the whole system and exchanges data with the PCS and EMS.
Why is balancing important?
Cell voltages drift over time; balancing equalises them so no single cell limits capacity or over-charges, preserving pack energy and life.
How accurate is the SOC estimate?
Our adaptive estimation typically holds SOC accuracy within a few percent across the full temperature and current range.
What interfaces does the BMS expose?
Standard CAN and RS485/Modbus, plus dry-contact and relay outputs for external protection and signalling.
Instant Selection & Quote Calculator
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| Base price (interpolation) | $0 |
| × Product factor | ×1.0000 |
| × Country factor | ×1.0000 |
| × Copper-linked factor | ×1.0000 |
| + Options / accessories | $0 |
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All specifications and dimensions can be customized upon request