1. Maieutic Parataxis

2. Software Defined Batteries
6/10/2018 4:03 PM
Brian K Seitz
for
Software Defined Batteries
Ranveer Chandra
Microsoft Research
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3. 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)

4. 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 ……

5. 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.

6. 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.)

7. 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…..

8. 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.)

9. Maieutic Parataxis