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Software Defined Batteries 6/10/2018 4:03 PM Brian K Seitz for Software Defined Batteries Ranveer Chandra Microsoft Research © 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

Evolution of Phones vs. Batteries Application Energy Density & chemistry Battery System Design Li-ion Courtesy: Electronic Design Energy Density NiMH Batteries have different parameters: List typical parameters cost, capacity, rate of charge, charge density,  weight, cycle life time, shelf life.   NiCad Time (yr)

Battery Chemistries are primary determinant of type 1 Power Density (watt/kg) Flexibility (Bendability) Energy Density (joule/kg) Affordability (joule/$) Longevity (cycles) Efficiency (heat loss %) type 2 type 3 Needs are varied by application and nothing is demanded in steady state. Care on a trip, Starting an OS vs. Running application.   Had to pick the best possible compromise based on application The chemistry has, until now, been the standard of battery functionality ……

Software Defined Batteries Heterogeneous Chemistries SDB Hardware SDB Charging Circuit SDB Discharging Circuit Cheap, simple & Future proof hardware SDB Software SDB OS Device Driver Kernel User SDB Policy Engine Intelligent software: Workload aware The base assumption of battery design is challenged by adding a time switch that is driven by a software definition. This enables one to combine different chemistries and therefore performance profiles   The software monitors load, charge state, understands cell capability and provides optimum performance to load.

Key SDB Benefits Scenario Enabled Benefits Flexible battery Larger battery capacity with SDB Batteries can be installed anywhere No need for silver-bullet battery Scenario Enabled Benefits Flexible battery 200% increase in battery capacity 3x fast charging battery 2.5 year battery life High power battery 10% decrease in latency for certain tasks External battery 100% increase in battery capacity significant increase with SDB... even more performance with predictive system management   1st time ever! Enable the OS to work with the battery to optimize power consumption with demand implication applies to every electro mechanical system that uses a battery an electric device: (eg. electric cars, computers, renewable energy storage etc.)

Implication applies to every electro mechanical system that uses a battery Implication applies to every electro mechanical system that uses a battery an electric device: (eg. electric cars, computers, renewable energy storage etc.); Even that small weekend vacation cottage…..

SDB Summary SDB enables battery to be managed by the OS as a resource Power to/from the battery can be adapted based on workload Combining different chemistries leads to significant benefits New scenarios, increase capacity, reduced charging times Moving ahead: Integration with calendars and smart assistants, e.g. Cortana Improving electrical vehicle range based on incline, temperature, traffic Increasing drone flight time based on wind conditions, flight path   implication applies to every electro mechanical system that uses a battery an electric device: (eg. electric cars, computers, renewable energy storage etc.)

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