How to Measure Battery Internal Resistance Using the Current Interrupt Method

James Niemann, Analog Design Engineer, Tektronix

One of the demonstrations we often set up at battery conferences is to use a source measure unit (SMU) to measure the internal resistance of an energy storage device such as a battery or a fuel cell. In such demonstrations, the SMU changes the load current from the battery operating current or the polarizing current to the open circuit potential and simultaneously measures the change in cell voltage. In this “current interrupt method,” the battery’s internal resistance is equal to the change in voltage divided by the change in current. Continue reading

Q&A with Inventus Power CEO Pat Trippel

Battery Power’s Senior Editor, Shannon Given, had the opportunity to interview Pat Trippel, the recently announced CEO of Inventus Power. Inventus Power is the is the largest vertically integrated power systems manufacturer in the US and produces custom battery solutions for medical, military, commercial and consumer markets in nine countries across the globe. Continue reading

Improve Tab to Terminal Connections in Battery Pack Manufacturing

Geoff Shannon, Amada Miyachi America, Inc.

Battery packs have become an integral part of everyday life, powering a growing range of portable electronic devices, cordless power tools, energy storage, and hybrid and electric vehicles. Tab to terminal connection welding is one of the key battery pack manufacturing applications. Manufacturers need equipment, systems, and automated lines that meet quality and production requirements for these products. Both resistance and laser products are well suited to integration into production lines that may be either standalone or automated operation. To maintain the required throughput that offers high quality and yields, users must have a clear understanding of which process is best for the particular battery pack size, tab and terminal material, type, and thickness. In addition, the selected process and integration solution should include process monitoring, process data management, and weld quality assessment. Continue reading

Sorting Busbar Choices for Electric Vehicle Power Distribution

Dominik Pawlik, Technical Marketing Manager
Rogers Corp., Power Electronics Solutions (PES)

Interest in electric vehicles (EVs) and hybrid electric vehicles (HEVs) is growing steadily as battery technologies improve and the driving range of such vehicles increases. Perhaps as important, EVs/HEVs offer a “green” alternative to traditional vehicles powered by internal-combustion gasoline engines. Continue reading

Protecting Lithium Batteries and Battery Packs from Runaway Thermal Events

BS&B Safety Systems

The market for lithium batteries and battery packs is booming.  With extensive applications in automotive, IT, aerospace, consumer electronics and a myriad of industrial sectors, the usage of rechargeable lithium batteries is growing throughout the world.  The market for lithium-ion batteries alone is expected to exceed $30 billion in the next few years. Continue reading

Improving Lithium Ion Battery for Future Energy Storage Needs

David Lee, CEO, BioSolar

Different electrical energy storage applications require a different set of energy storage solutions based on their own unique specifications. Therefore, different electric energy storage applications possess different order of priorities for storage device features often associated with specific types of electrical energy storage technology. Continue reading

Enhancing Smartphone Battery Performance During GSM Pulses Through The Use of a Parallel Supercapacitor

Ron Demcko • AVX Fellow
Patrick German, Field Applications Engineer • AVX Corp.

The continual addition of smartphone features and functionality, combined with users’ growing dependence on them for both business and personal use, has made battery life and reliability increasingly vital. The digital transmission signals that these devices rely on to operate require quick pulses of current from the battery. However, these pulses can also cause the battery’s instantaneous voltage to drop below the phone’s minimum operating voltage, which can temporarily interrupt the flow of power from the battery. To solve this problem, engineers performed a series of tests on multiple battery chemistries to determine whether placing a supercapacitor in parallel with the battery could effectively improve the life of the battery and the quality of the power it provides.
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