Main switching and pre-charge
A project may integrate main positive/negative contactors, pre-charge, service disconnect, and control sequencing according to the battery and inverter requirements.
Custom BDU / BJB capability
custom BDU · Product category / custom BDU-BJB capability
Custom BDU and BJB Solutions for High-Voltage Battery Systems
TRHT supports project-based BDU and BJB architecture review for high-voltage battery systems. No fixed BDU model, rating, environmental limit, or product-specific image is claimed on this page.
What a BDU or BJB typically does
A Battery Disconnect Unit or Battery Junction Box typically manages battery isolation and connection functions near or within the battery system. The exact boundary between BDU, BJB, PDU, and pack controls depends on the electrical architecture and service strategy.
Typical functions available in a custom architecture
Fuse, current sensing, service disconnect, HVIL, and interfaces
Fuse protection, sensing, HVIL/control, busbars, connectors, and pack interfaces can be evaluated when the battery/BMS data and packaging constraints are available.
BDU/BJB versus EV PDU
An EV PDU generally distributes and protects high-voltage power to vehicle loads. A BDU/BJB typically emphasizes battery isolation, main connection, pre-charge, and serviceability. Real architectures can combine or divide these functions, so the system boundary should be agreed from the SLD.
Engineering inputs for a custom BDU/BJB
- Battery nominal and operating voltage window
- Continuous/peak current and fault data
- BMS signals, contactor logic, pre-charge and HVIL requirements
- Fuse, sensing, service disconnect and connector requirements
- Pack envelope, mounting, cooling, environment, quantity and project stage
Battery-system control, protection, and serviceability considerations
Engineering review should align protection coordination, isolation behavior, service access, connector and busbar routing, thermal conditions, control diagnostics, and validation acceptance criteria. Existing factory/testing media is process evidence only, not proof of a completed BDU validation program.
Evidence context
Real TRHT engineering and testing context
These visuals support a conservative engineering and workmanship context. They do not identify an exact model or prove a universal rating, certification, customer case, or completed validation result.
Buyer questions
Frequently asked questions
What is a Battery Disconnect Unit?
A BDU is a battery-system assembly that typically manages high-voltage isolation, main connection, pre-charge, protection, sensing, and service functions. The exact design depends on the battery architecture.
What is the difference between a BDU and BJB?
The terms overlap in industry. A BDU often emphasizes disconnect and switching functions, while a BJB may describe a broader battery junction and protection assembly. The required functions and system boundary should be defined in the project SLD.
How is a BDU different from an EV PDU?
A BDU/BJB is usually centered near the battery system, while an EV PDU distributes protected high-voltage power to vehicle loads. The final boundary is architecture-dependent.
What components can be integrated?
Depending on the project, main contactors, pre-charge, fuse protection, current sensing, service disconnect, HVIL/control, busbars, connectors, and pack interfaces may be evaluated.
What battery and BMS data are required?
Provide voltage and current duty, fault assumptions, battery/BMS signals, contactor and pre-charge logic, service requirements, pack envelope, connectors, environment, project stage, and quantity context.
How are pre-charge and fuse requirements defined?
They are defined from bus capacitance, load profile, fault current, battery resistance, switching sequence, protection coordination, service strategy, and applicable validation criteria.
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