SG Power Enterprise - Advanced Unmanned System Power Solution

Battery monitoring importance for facilities personnel. Especially and UI designers. Know what are the important monitoring parameters and what are the different causes of lead acid battery or battery.

Battery monitoring and maintenance guidelines | EEP Battery monitoring has become a very popular topic, and many companies have either purchased equipment or are in the process of evaluating these

This is a great achievement.

Totally Silent Airplane Achieves Flight With No Moving Parts An airplane you can't hear no matter how hard you try.

Newly commissioned 3-phase, 10KW charger unit.
• Output 24Vdc@400Amp
• Input 3-phase 32A
• Fully protected
• Fitted with 6" castor wheels
• Forklift-able

Contact us for more info.

In Sept 2011, Tesla, builds 500 electric powertrain components for the Mercedes-Benz A-Class E-Cell, an electric car with a range of 120 mi (200 km) and 214 ft·lbf (290 N·m) of torque. The 36 kWh battery contains approximately 4,000 lithium-ion cells.

- Source: Wikipedia

We can achieve that with no more than 486 cells.

Do you know how many cells are there in a Tesla Model S? How are they configured as a DC source?

Model S has 7,104 numbers of 18650 cylindrical cells stacked into 16 modules in series. Each module is 444 cells arranged in 6S74P configuration. They pump out 24V exactly and produces 5,300Wh. 16 in series make up 384V-dc.

With 384V and almost 85kWh capacity, a lot of heat is generated internally. Therefore Tesla battery system is designed with cooling surface mated to coolant flow system at the bottom of the battery packs.

In 2012, DSO sought out and discussed what we can achieve if given a tube of diameter 150mm, the maximum battery capacity. On paper we think its possible for 1600Wh at a very light weight of just 5-6kg. The conversation took place somewhere end of 2012.

By beginning of 2013 very near to CNY, we thought maybe we could put up quickly a physical model with exact acrylic tube size of 150mm and made some rectangular blocks using acrylic as well to assimilate the weight and dimension of the proposed high-energy cells. We work through the CNY week and while friends and family members were with us at a chalet having buffet steamboat, we were hacking and hammering away in the courtyard chipping off the model to a smooth finishing touch. It was all hard work as our fingers were sore from the micrometer of sanding down so as to get that tight fit.
We finished the sample model that night and presented it upon the first opportunity to our potential customer.

They presented it to the board for god knows what that may end up with. We do not have any clue what it will be used on as usual, secrecy and BS story they tell you. We understood.

After a week it was returned. and nothing further was asked. We probed, nothing. Months went and we focus on other projects. End 2013, RFQ came. We work out the math and submitted our package. Unfortunately it was way beyond their budget to stomach. For that budget they had, and because it was only exploratory stage, they suggested doing with low tech chemistry since light-weight is not the top priority. We settled for Ni-MH.

When we went back to the drawing board, it became clearer the challenge was much more complex and tedious then we thought. From a 6-months delivery schedule it was stretched. The R&D began in Mar-2014. Many iterations evolved, mechanically and electronically. A single cylindrical cell on paper can perform like wonder. Now place 52 of them concentrically held in an industrial laser 3D-printed mold and close them up, the thermal run-away became a real threat. We generate enough heat quickly during charging to set fire to one of the prototype in order to set a critical limit to how far we can push these cells.

After months of data-collection, we were ready to integrate the massive 50S5P of Ni-MH and run charging and discharging of various rates. Sometime it will take more than 16hrs to complete a cycle and it went on for months in order to fine-tune the parameters and hard-set them. Many thanks to Vi Su of Adma & Lee and his team for developing the Smart-BMS. When it was finally ready for Environment Qualification Test, we really do not know what will happen when the high and low temperature shock is applied and that shaker table will break anything at all. After a week, it passed the litmus test and we delivered the first set to DSO for system integration test. It all went well and we delivered the final system by mid 2015, thus clearing the longest R&D to production delivery project we had ever undertaken.

IMPORTANT LESSON:

On June 14, 2016 the encountered their 4th Li-Ion battery fire incident. This happen on their system.

In short, the 24S4P 20Ah Li-Ion pack was put to charged on the system instead on another external charging station. This procedure somehow had a shortcut taken, bypassing the BMS that was on-board but not connected to the pack to monitor and control the charging.

For full story, please visit the NASA page and view the full safety message by Lynne Lee, MIshap Program Manager.

I advise all WSHC Safety Managers, Officers, Facilitators, Senior Management and anybody else having a stake related to the safe use of Li-Ion/Li-Po batteries to view the video where a detail account of what had happen, why it happens, what could be done, and how to put in place safety wrt Lithium batteries powered projects.

In SGPE, we only recommend Amicell's Li-Po battery cells. Cells as high as 23.88Ah has passed UL1642 tests and no reported fire incident as far as we distributed them. We have also undertook design, test & integration of our own customised BMS for large battery pack and in the midst of customizing another BMS for a medium size UAV.

In term of safety, we have Type D fire extinguisher in our premises.

We hope you pick up precious points from this video professionally done by the .

RoboSimian Lithium-Ion Battery Fire RoboSimian Lithium-Ion Battery Fire October 03, 2016 Just as lithium-ion (Li-ion) batteries are a very common power supply in consumer items, they are also an essential part of the power systems used across NASA. Agency applications range from launch systems, payloads and unmanned aerial systems to…

We mourned today the lost of our founding father of Singapore, Mr Lee Kuan Yew. There will never be another you.. Thank you for leading Singapore where she is today.

Impressive! Full size F16 flown unmanned!

Test Missile Fired at Boeing’s QF-16 | UAS VISION Test Missile Fired at Boeing’s QF-16 Boeing’s unmanned QF-16 performs for the first time as an aerial target. Source: YouTube/Boeing Posted in Targets on August 29, 2014 by The Editor. Leave a comment

SGPE wishes a Happy 49th Birthday!