For next gen BMS Validation As electric mobility and high-capacity energy storage systems (ESS) evolve, the complexity of Battery Management System (BMS) validation grows exponentially. Testing against real battery cells is not only hazardous and time-consuming but also limits the ability to replicate critical edge-case faults and long-term aging effects.

Introducing the MaxEye MBCS-12C Battery Cell Simulator is a high-precision, programmable solution designed to replicate the complex electrochemical behavior of real battery cells. Built on a modular and scalable architecture, the MBCS-12C enables engineers to perform rigorous HIL (Hardware-in-the-Loop) testing in a safe, repeatable, and fully controlled laboratory environment.

The MBCS-12C is engineered with a modular philosophy, allowing you to transition from sub-module testing to full-scale pack validation with ease. By stacking multiple 12-channel modules in series, the system scales up to 240 cells, achieving a total series voltage of 1200V DC. This makes it the ideal solution for validating modern 400V and 800V EV architectures.

Communication is streamlined through a unified CAN interface architecture. Multiple hardware units can be daisy-chained, allowing the host PC to command and monitor every individual cell in the stack through a single CAN gateway. This reduces wiring complexity and ensures high-speed, synchronized control across the entire high-voltage system.

MBCS-12C Hardware Highlights:

• Simulates 12 isolated programmable cells in a single compact module

• Scalable up to 250 cells (1200 V max) for full-pack simulation

• High-precision output — 120 µV resolution and ±1 mV accuracy

• Supports open, short, and reverse polarity fault simulation

• CAN interface (1 Mbps) for seamless integration with HIL setups

• Supports both passive and active balancing

High-Current Cell Balancing Emulation:

The MBCS-12C is engineered to validate the most demanding cell equalization strategies. Unlike standard simulators that offer limited current sinks, the MBCS-12C provides a robust, bidirectional current capability of +/-2A per channel, enabling full-scale validation of both passive and active balancing circuits

The MBCS-12C hardware is engineered to meet the accuracy requirements of modern Li-ion and solid-state battery monitoring ICs.The detailed specification of the MBCS is as follows

Parameters	Value / Range
Output voltage per cell	0.01 V - 6 V
Output voltage resolution	200 µV
Output voltage accuracy	+/- 1 mV
Sourcing/sinking current per cell	+/- 2 A
Cell to ground isolation	1.2 kV
Max. number of cells in series	240
Fault simulation (for each cell)	Open, short & reverse polarity
Voltage sensing accuracy	+/- 0.5 mV
Sinking current accuracy	+/- 2 mA
Current sensing range	-2.2 A to +2.2 A
Current sensing accuracy	+/- 1 mA
Communication Interface	CAN (1 Mbps)

Enabling Dynamic Battery Behavior with MX EV Suite Integration

Beyond Static Voltage

The MX EV Suite is a deterministic simulation environment designed to replicate the dynamic behavior of Lithium-ion cells with surgical precision. At its core is the 3RC Equivalent Circuit Model (ECM)—a sophisticated mathematical framework that strikes the perfect balance between high-speed real-time execution and the complex accuracy required for advanced BMS validation.

The 3RC ECM architecture allows the software to simulate not just static voltage, but the transient "recovery" and "voltage drop" characteristics of a battery under load

Data-Driven Fidelity: The model leverages user-provided Look-Up Tables (LUT) containing experimentally measured Open Circuit Voltage (OCV) and Internal Resistance data. This ensures the simulation is a true reflection of your specific cell chemistry.

Coupled Electro-Thermal Physics: Beyond electrical signals, the suite calculates real-time thermal behavior for up to 200 cells in series. By inputting the cell’s mass, surface area, and thermal coefficients, engineers can observe heat generation and dissipation across the entire pack.

Flexible Load Profiles: The model accepts charge/discharge current via:

• Manual Control: For real-time "on-the-fly" testing.

• Standard Drive Cycles: Integrated support for UDDS, FUDS, and WLTP.

• Custom Field Data: Import current logs directly from vehicle fleet data to replicate real-world driving conditions in the lab.

Key Features

• Aging Simulation: Simulate the long-term lifecycle of a battery in a fraction of the time. The suite calculates Calendar Aging, Self-Aging, and Capacity/Resistance Fading caused by repetitive cycling.

• High-Scale Series Simulation: Supports full-pack architectures with up to 200 cells modeled in a single deterministic loop.

• Dynamic Thermal Mapping: Real-time calculation of cell temperature based on current throughput and physical cell characteristics.

• Native MBCS Integration: The MX-EV Suite features an inbuilt CAN protocol driver specifically mapped for the MBCS-12C Battery Cell Simulator, ensuring zero-config connectivity.

Seamless HIL Integration: Building a Complete Battery Digital Twin

The MBCS-12C is designed specifically to serve as the high-precision foundation of a comprehensive BMS HIL environment. By acting as a modular "Cell Layer," it integrates seamlessly with a diverse array of sensor simulation units and power electronics to provide a 360-degree digital twin of a battery pack. This multi-signal synchronicity allows for the validation of complex control logic that depends on the simultaneous interaction of voltage, current, temperature, and safety monitoring.

To achieve a true-to-life simulation, the HIL should be integrated with MBCS-12C , Temperature Simulation units and Bidirectional Power Supplies. While the MBCS-12C manages the individual cell potentials, programmable resistance modules emulate the NTC/PTC thermistor signals that the BMS uses to monitor pack health. Simultaneously, high-power bidirectional DC supplies simulate the pack-level current flow, allowing the system to emulate the massive energy shifts of regenerative braking or rapid DC charging.

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