Multichannel Lithium Ion Battery Testing System Design

The 8-channel lithium-ion battery testing system is designed for high-demand makes use of, providing dependable charging management and temperature checks.

The  multichannel lithium ion battery testing system reference design from Analog Gadgets (ADI) is a exact, cost-effective, 8-channel battery testing setup for single-cell lithium-ion (Li-ion) batteries with open circuit voltages (OCV) starting from 3.5 V to 4.4 V. Demand for Li-ion batteries is excessive throughout numerous functions, from low-power gadgets like laptops, cellphones, and transportable wi-fi terminals to high-power makes use of in hybrid and all-electric automobiles (HEV/EV). Correct and reliable check methods are important for these batteries. 

The circuit options the ADP5065 fast-charging battery supervisor, which supplies versatile, environment friendly, and steady charging management with a low-cost, compact PCB footprint and ease of use over conventional discrete options. For precision knowledge acquisition and processing, the ADuCM360 analog microcontroller is employed to measure battery voltage, present, and temperature. Outfitted with a high-precision ADC, DAC, and an on-chip microcontroller, the ADuCM360 allows totally self-contained management over the charging and discharging processes.

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The ADP5065 handles full charging management for single-cell Li-ion or lithium polymer batteries, supporting fixed present (CC), fixed voltage (CV), and trickle cost (TC) modes. The TC mode is especially helpful for safely testing deeply discharged batteries. Leveraging a DC-DC switching converter structure, the ADP5065 achieves increased charging effectivity than conventional linear regulators.

For dependable efficiency, the battery supervisor integrates options corresponding to thermal administration, battery fault detection, and fault restoration. Its charging parameters—together with quick charging present, termination present, and termination voltage—are programmable by way of an I2C interface. This programmability permits the battery supervisor to accommodate numerous sorts of Li-ion batteries, making it a flexible and full battery charging and testing controller.

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The analog entrance finish is designed with a completely differential configuration, delivering excessive common-mode rejection ratio (CMRR) and powerful immunity to common-mode and floor noise generated by giant currents throughout cost and discharge cycles. Moreover, the system’s structure helps straightforward enlargement of channels, enabling decreased testing time and value per battery.

The digital load (E-load) circuit affords a programmable constant-current load. It makes use of the AD8601 precision CMOS op-amp, 4 1 W, 1% energy resistors, and two SIR464 energy MOSFETs. Most Li-ion batteries shouldn’t be charged at temperatures beneath 0°C or above 60°C, with quick charging and discharging restricted to a spread of 10°C to 45°C. Past security considerations, battery efficiency can differ considerably with temperature. Correct temperature measurement is crucial to make sure each the consistency of check outcomes and general security.

ADI has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has further knowledge concerning the reference design. To learn extra about this reference design, click on right here.