E-Safe

Problem

  Over the course of a couple of years, there have been hundreds of injuries involving e-batteries

10 deaths, 226 injuries in New York from 2021-2022* San Francisco hit record high of 58 battery fire incidents in 2022* Battery fires have caused $10.6 million in property damages in the last decade in San Francisco*

How E-Safe addresses inequity

   E-Safe addresses the multiple inequities caused by electric vehicle fires:

Access to EV’s in any country Environmental Justice

UN Sustainable Development Goals

   Our product relates to the UN Sustainable goals as it promotes

Good Health and Wellbeing (3) Sustainable Cities and Communities (11) Responsible Production and Consumption (12)

How Does it Help?

   E-Safe prevents electric bike fires, which prevent:

property damage injuries and death inequity between different income groups in all countries

Our Engineering Design Process

 ** Problem**
  Electric batteries are catching fire due to overcharging all around the world
 ** Solution**
  We decided to control the power flow using voltmeters and humidity 
  sensors
   This would stop overheating and combustion
   **Implementation**
   We assembled the parts necessary and built the circuit
   To hold it together, we created a box using CAD and 3D printed it
    Finally, we tested it a lot to make it work
    **User Feedback**
     User feedback enabled us to improve our product much further. 
     He asked for An App Compactness Efficiency
     After we implemented these, he was content with the design
     **Design Iteration**
     First, we came up with a crude method : Using a servo to pull out the plug. 
    We then thought of a different solution involving relays to turn the circuit on and off.  
     After building our box, we used our user feedback to make more iterations to our design. 
     **Final Product **
     Using user feedback, we made multiple changes to the product
     Overall E-Safe is now more efficient, compact, and it comes with an app.

Technology Usage

   ESP32  (micro-controller) - $3
   1 Channel AC 250V/ DC 30V Relay (to turn charging on or off ) - $2
   AC/DC 5V Converter (to power ESP32 from Relay load ) - $1
   DHT11 Digital Temperature And Humidity Sensor (to measure temperature 
   of the battery) - $4
   Resistors (measures voltage output) - $0.20
   Extension Cord ( for charger to plug into) - $2
   Filament ( for enclosure of parts ) - $0.30
   Miscellaneous ( wires, screws, connectors ) - $0.50
   Total Cost of E-Safe : $13

How Does It Work?

   The e- safe app  first asks the ESP32 for the value from the temperature and voltage sensors.
   Based on these inputs the ESP decides the state of the relay -  if it is on or off. If it is on, its charging else, its not.
   The app displays the temperature and based on the state of the relay, it displays whether it is currently charging or stopped
    The green button tells the ESP32 to change the state of the relay turning the relay on or off. Once pressed, the button turns red and has different text. 

Challenges and Solutions

   Putting the circuit together ,Wires would move around while soldering which was dangerous, When we were soldering wires, we kept mixing wires up. It can lead to wires connected incorrectly leading a chance of the circuit blowing. Sometimes there were issues with sensor values and readability. Sometimes, the cause of the error couldn’t be found.

Conclusion

   E-safe also saves the user electricity since it will cut off power once the battery is fully charged. Our app allows users to control E-Safe wirelessly.

The design of our 3D printed box allows for it to be produced very easily. E-Safe can work in any country in the world.

Built With

• 3dprinting
• arduino
• c
• cad
• electricalengineering
• esp32
• mechanicalengineering
• soldering