Battery Power - Summer 2016 - (Page 25)

Components * New Products Heat Flux Measurements Enable a Fast Alternative to Common Battery Calorimetry To increase the safety and quality of batteries, research and data about batteries is necessary. On important parameter is the thermal behavior of batteries, which can be measured with heat flux sensors. In addition to standard calorimetric measurements, using heat flux sensors directly on the battery surface allows for highly resolved thermal profiling at isothermal conditions. Common entropy and enthalpy determination methods take up to 400 hours for characterization of one cell. The entropy profiling with the a heat flux sensor can be done during normal charging and discharging of a battery. With highly sensitive heat flux sensors, calorimetric measurements become affordable and feasible for any system and application. This method opens new dimensions in terms of speed and precision of battery quality and status analysis. During charging and discharging of batteries Li-ions are intercalated or removed from the electrode. When no more space is available, the Li-ions undergo a phase transition in order to intercalate more ions. The same phase transitions also occur during discharging of the electrode. These transitions are accompanied by thermal energy release or uptake, which can be detected with greenTEG's heat flux sensors. Any change in the electrode or electrolyte quality can be detected accordingly. Heat flux sensors can measure conductive, convective and radiative heat fluxes. Tiny piles of serially connected semiconductor material build up a voltage signal as soon as a temperature difference between the two sides of the sensor occurs and thus heat begins to flow. This voltage signal can then be read out and further processed. The advantage of greenTEG's heat flux sensors is the high sensitivity, which is achieved thanks to a thin sensor module design. A patented production process based on electrochemical deposition allows for highly competitive prices for large volumes. Ultra Low Profile, 20 mm Coin Cell Battery Retainers A series of SMT and THM, low profile, 20 mm coin cell battery retainers designed for high density PCB packaging use are the latest products from Keystone Electronics Corp. Engineered with high efficiency spring tension to assure low contact resistance, the designs firmly secure batteries within the retainers. Rugged, lightweight and bearing clearly-marked polarity, the ultralow profile feature makes them well suited for space saving PCB applications. Manufactured of Phosphor Bronze, these 20 mm coin cell retainers accept 2016, 2020, 2025 and 2032 coin cells from all major manufacturers. These holders are nickel-plated for durability and high temperature soldering. The SMT versions, Catalog #3034, are equipped with solder tails located outside of the retainer bodies to ease solder joint visual inspections. Dreamweaver International Develops Technology for Thin Nonwoven Battery Separator Dreamweaver International has developed patented technology that will allow it to make thin, nonwoven separators for lithium ion batteries and supercapacitors, as low as 10 to 12 microns. The technology relies on lighter weights and much higher compression than other nonwoven battery separators. The innovation will allow the traditional benefits of nonwoven separators, enhanced safety at a low cost, to be delivered at a thickness that is optimum for traditional lithium ion battery separators. Dreamweaver's new separator technology half the thickness of current non-woven separators. It facilitates smaller, lighter, less expensive batteries and supercapacitors, and is compatible with all existing supercapacitor and lithium ion battery technologies. Dreamweaver has prototypes for a 15 micron Titanium product developed for the supercapacitor industry, and a 20 micron Silver product developed for the lithium ion battery market. The products will be produced by Glatfelter, Dreamweaver's production partner. Products as low as 10 to 12 microns thin will follow. Summer 2016 * Battery Power 25

Table of Contents for the Digital Edition of Battery Power - Summer 2016

Toolbox Energy Storage Systems: Modeling, Simulating and Testing Battery Systems of (H)EVs
Enhancing Smartphone Battery Performance During GSM Pulses Through The Use of a Parallel Supercapacitor
ICs & Semiconductors
Charging Systems
Testing & Monitoring
Editor’s Choice
Research & Development
Conference Preview
Industry News
Calendar of Events

Battery Power - Summer 2016