Energy Management - Evaira CellSpy
Evaira introduces CellSpy, advanced battery management system for the state-of-the-art lithium ion battery technology, including Evaira's SLiC technology as well as other systems. Energy storage systems require a comprehensive Battery Management System (BMS) in order to safeguard the system from over-charge and over-discharge, monitor pack vitals including temperature and voltage, and to supply statistics to the system including State-Of-Charge (SOC), fault and logging of statistical data. Battery management is critical to system performance and longevity.
CellSpy performs these tasks and more. CellSpy employs a centralized rather than distributed (BMS in each module) architecture and advanced algorithms developed originally for military applications. Aside from a temperature sensor embedded into the core of every SLiC module, there are no electronics in the SLiC (or customer supplier energy system) or elsewhere in the energy storage system. One CellSpy electronic control unit (ECU) manages the entire energy system, measuring voltages and temperature, and balancing every parallel group of cells. This centralization improves reliability by reducing complex component parts count and also lowers initial cost and recurring maintenance costs by simplifying the repair process.
CellSpy performs continuously balancing to <5mV (absolute across the operating temperature range of -55 deg C to +85 deg C) at all times throughout the charge cycle, the discharge cycle, and even at rest. CellSpy performs accurate SOC calculation based on coulombs, voltage, dynamically adjusted for rate, temperature and the dynamically calculated state of health (SOH) of the energy storage system. CellSpy differs from other systems in that it connector between the battery return and the load return, giving CellSpy circuit interruption capability. If a failure is detected, CellSpy can interrupt the main return line in 40usec using its integrated solid-state (fuse-less, contactor-less) circuit interruption feature. CellSpy also provides support for pre-charge contactor drive, and sports CANbus, Ethernet, and serial interfaces. For diagnostics support, CellSpy logs a number of data points recorded during the drive cycle. Parameters are recorded to non-volatile memory inside the ECU for later retrieval and analysis. Baseline parameters include charge/discharge cycles, peak high and low temperatures, average SOC when charging, lowest SOC, maximum current, and operating time. Statistics data is critical for field evaluation of product, failure mode analysis, and for warranty application. To retrieve logged data and support other maintenance operations, CellSpy acts as Internet appliance capable of being controlled, monitored, and upgraded through any web browser capable device over Ethernet. Simply connect any PC, notebook, or similar device to the CellSpy maintenance port and all system functions are available to the operator over the web browser. By integrating the diagnostic support directly into CellSpy there is no need for expensive diagnostic tools, reducing the overall cost of ownership.
Features:
Conduction cooled mil/aero ruggedized construction
Conformal coated, environmentally sealed electronics
Scalable architecture to over 1,000V
Optically isolated channels to each battery modules
Temperature monitoring for each battery module to +/-1 deg C
Current measurement accurate to 1%
Wide operating temperature range, -55 deg C to +85 deg C
Voltage measurements accurate to 0.005V across temperature range
No schedule calibration or maintenance required
CANbus 2.0b, RS232, and Ethernet interfaces
In-system firmware upgrade feature
Integrated security levels for operators, dealers, and maintenance personnel
CellSpy DataBrief
