Stafl Systems
Insights Video Series

Learn about the latest in lithium-ion battery technology.

Erik Stafl, founder of Stafl Systems, walks you through the latest innovations in Battery Management System technology in this series of detailed, easy to understand videos.

1b

BMS SAFETY AND FAULT MANAGEMENT

Summary

Erik discusses BMS safety and fault management. He looks at the conditions the BMS monitors, using a system diagram to understand cell voltage reporting. Using a chart with voltage and temperature, Erik explains the safe operating area for the battery pack cells. The BMS monitors the minimum safe temperature, maximum safe operating temperature, minimum safe voltage and maximum safe voltage, depending on chemistry. The BMS will work to keep battery cells within the safe operating area and report any faults that threaten overtemperature or overcharge, which can lead to thermal runaway. The BMS will also prevent overdischarge or under temperature that can also threatened the battery cell.

The BMS manages the cell performance and communicates this information to the external application. The BMS can also disconnect the from the external application to protect the battery pack to prevent unsafe operation, triggering a fault.

Topics Covered

BMS safety

Safe Operating Area

Over Voltage Fault (OV Fault)

Over Temperature Fault (OT Fault)

Under Voltage (UV Fault)

Under Temperature (UT Fault)

Dendritic Growth

Thermal Runaway

Fault Reporting

BMS Disconnect

1a

INTRODUCTION TO BATTERY MANAGEMENT SYSTEMS

Summary

Erik Stafl, president of Stafl Systems, explains two primary purposes of a battery management system for a lithium-ion battery pack: providing safe and reliable operation. The Battery Management System takes a number of inputs, including voltage, temperatures, and current among other inputs. The BMS then runs algorithms to create a series of outputs including state of charge (the fuel gauge), the state of health, the safe operating envelope ™, and any faults the battery pack may have.

Erik then describes how the BMS is used in a multi-cell application, using a system diagram.

Topics Covered

Purpose of a BMS

BMS Inputs

BMS Outputs

Current Sensors

BMS System Diagram

BMS Communication

Blog Post Title One

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Blog Post Title Two

It all begins with an idea. Maybe you want to launch a business. Maybe you want to turn a hobby into something more. Or maybe you have a creative project to share with the world. Whatever it is, the way you tell your story online can make all the difference.

Don’t worry about sounding professional. Sound like you. There are over 1.5 billion websites out there, but your story is what’s going to separate this one from the rest. If you read the words back and don’t hear your own voice in your head, that’s a good sign you still have more work to do.

Be clear, be confident and don’t overthink it. The beauty of your story is that it’s going to continue to evolve and your site can evolve with it. Your goal should be to make it feel right for right now. Later will take care of itself. It always does.

Blog Post Title Three

It all begins with an idea. Maybe you want to launch a business. Maybe you want to turn a hobby into something more. Or maybe you have a creative project to share with the world. Whatever it is, the way you tell your story online can make all the difference.

Don’t worry about sounding professional. Sound like you. There are over 1.5 billion websites out there, but your story is what’s going to separate this one from the rest. If you read the words back and don’t hear your own voice in your head, that’s a good sign you still have more work to do.

Be clear, be confident and don’t overthink it. The beauty of your story is that it’s going to continue to evolve and your site can evolve with it. Your goal should be to make it feel right for right now. Later will take care of itself. It always does.

Blog Post Title Four

It all begins with an idea. Maybe you want to launch a business. Maybe you want to turn a hobby into something more. Or maybe you have a creative project to share with the world. Whatever it is, the way you tell your story online can make all the difference.

Don’t worry about sounding professional. Sound like you. There are over 1.5 billion websites out there, but your story is what’s going to separate this one from the rest. If you read the words back and don’t hear your own voice in your head, that’s a good sign you still have more work to do.

Be clear, be confident and don’t overthink it. The beauty of your story is that it’s going to continue to evolve and your site can evolve with it. Your goal should be to make it feel right for right now. Later will take care of itself. It always does.