Intro =========== **openBMS is seeking contributors** Offical Development Google Group: http://groups.google.com/group/openbms openBMS is an electric vehicle lithium ion battery management system(BMS) based on the [Linear Tech LTC6802-2](http://www.linear.com/product/LTC6802-2) integrated IC and [Cinch ModICE](http://www.cinch.com/products/transportation/modular-integrated-connector-enclosure) automotive enclosure. This BMS was originally designed by Ricky Gu of [UBC Electric Car Club](http://ubcecc.com) for the eBeetle project in spring 2010. The eBeetle became the [first electric vehicle to drive coast to coast across Canada](http://www.wired.com/autopia/2010/09/electrified-beetle-goes-coast-to-coast-in-canada/) in summer 2010. This BMS was one of the key component that enabled the eBeetle to drive 6400km in 14 days. Todo ========== * Complete Arduino breakout board to interface with BMS boards * Start Wiki Documentations Master Board Features =============== * Arduino Micro-controller * Low Voltage Protection * High Voltage Protection * LCD Display * Hall Effect Isolated Current Sensor * Coulomb Counting Daughter Board Features =========== * Measures up to 12 Li-Ion Cells in Series (60V Max) * Stackable Architecture Enables >1000V Systems * 0.25% Maximum Total Measurement Error * 13ms to Measure All Cells in a System * Cell Balancing: * On-Chip Passive Cell Balancing * Two Thermistor Inputs Plus On-Board Temperature Sensor * 1MHz Daisy-Chainable Serial Interface * High EMI Immunity * Delta Sigma Converter with Built-In Noise Filter * Open Wire Connection Fault Detection * Low Power Modes Mechanical Features =========== * Interfaces with Cinch SHS Harness Connector * Header modularity and blank headers offer design flexibility for alternate interconnects * Simple Assembly * Slide Header/PCB assembly in the Enclosure and snap shut * Housings – Glass filled polymer * Pins – Brass – Post tin plated * Seals – Silicone elastomer * RoHS – Compliant * Operating Temperature -55oC to +85oC * Sealing IP67, IP69K * Current Cycling 500 Hr * Salt Fog 96 Hr * Thermal Shock 10 cycles * Vibration 10 to 2000 Hz – 20 g peak level – XYZ – 24 Hr * Shock 50 g – 20 pulses * Temperature Humidity 1008 Hr * Temperature Life 1000 Hr * UV exposure 1000 Hr * Resists to most fluids used in industrial applications Photos ===========     License =========== This project is released under Creative Commons Noncommercial Share-Alike license. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.