Chroma ATE Inc.

2016
2016
Test Solution for 48V Mild Hybrid Battery Pack
2016/09/19

Today, many automakers are prepared to adopt 48V mild hybrid systems used for idle stop-start, power boosting, and regenerative braking. The cost of these systems is lower when compared to full hybrid electric vehicle (HEV) systems that can both reduce fuel consumption and also increase the horsepower of a car. Converting the power system from existing 12V to 48V has become a major trend for future development.

With the high demands a 48v power system places on batteries DCIR, high peak current charge/discharge, and lifespan, the early development of battery materials and type selection are the most important. In general, the analysis of differences in battery discharge curves (as shown in Fig.01) can be used as criteria for selection of the battery.

The specifications for this type of lithium battery module are 45 to 55 volts with 0.5kWh to 1.5kWh capacitance, and 200A~400A/10kW~20kW maximum peak output current/power. Chroma provides regenerative power pack test systems capable of instantaneous high current testing. The recommended models for testing to these specifications are the 17020_60V/250A/10kW and 17020_60V/500A/20kW systems .

In addition to the power specifications, the process quality during battery pack assembly is also crucial to battery production (as shown in Fig.02). Chroma has automatic battery pack test solutions for testing 48V battery packs which are the standard for several well-known car manufacturers in Europe, and have been used in the production lines of their battery suppliers. To meet battery production line test requirements, Chroma produces the 8700 Battery Pack Functional Automatic Test System (as shown in Fig.03) which includes standard testing functions like (1) short circuit detection, (2) BMS version and CAN communication tests, (3) relay switch detection, (4) insulation and hipot tests, (5) voltage/temperature conformity, (6) DCIR test, (7) dynamic performance test, and (8) other customized test items.

Furthermore, Chroma produces the 17020 bi-directional DC power source solution for testing the power and performance of the electric motor drive system. This system has energy recovery and battery simulation functions to optimize for energy-saving and safety test control.

Fig01: Comparison of Discharge Curves in Different Battery Materials

Fig01: Comparison of Discharge Curves in Different Battery Materials

Fig02: Lithium Battery Pack Assembly Diagram

Fig02: Lithium Battery Pack Assembly Diagram

Fig03: 8700 Battery Pack Functional Automatic Test System

Fig03: 8700 Battery Pack Functional Automatic Test System

With 30 years of experience in test and measurement instrumentation, Chroma is able to provide wide variety of test solutions for power and storage batteries. These include: Regenerative Battery Pack Test Systems for battery cells, battery modules, and battery packs; BMS PCBA test systems; battery cells/module/battery pack EOL Auto Test Systems; battery simulators; and super capacitors. These solutions are in use worldwide by manufacturers and third party laboratories. For any questions regarding these battery test solutions, please provide your contact information and we will reach out to you for further service.

For more information about our testing solutions for power supply - battery, please visit our company website:
http://www.chroma.com.tw/product/list/battery_pack_test_solution.htm