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By now we've all heard about "thermal incidents" with various type of lithium batteries and we've probably even seen videos of exploding laptops. Many of you have also complained about why it's taking so long for car-makers to get lithium batteries to market. One of the main causes of batteries getting too hot is overcharging or charging too fast.

Unfortunately determining the state of charge of a larger battery pack is not a trivial matter (we'll be following up with more information on this soon). A lot of the battery development work involves developing software to determine the state of charge and control the charging. For a look at what can happen when you over charge a lithium polymer battery, check out the video after the jump.

[Source: Kipkay, Metacafe]

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    • 1 Second Ago
  • 8 Comments
      • 4 Years Ago
      Ms.Helen Ren ******************** Qinhuangdao Xinchi Photoelectricity Technology Co.,Ltd 275km South to No.102 National Road, Shenhe Industry Park, Funing County, Qinhuangdao,Hebei,China Tel: 0086-335-6309637 Fax: 0086-335-6309632 Msn: helenxcgd@msn.cn Skype: helenxcgd Yahoo ID: helenxcgd@yahoo.cn http://xcgd.en.alibaba.com/ http://www.xcgdbattery.com ********************** About Us Qinhuangdao Xinchi Photoelectricity Technology Co.,Ltd., was established in 2006, specializing in Research and Development, manufacture of high quality Li-ion battery. We offer wide ranges of batteries, LiFePO4 battery, LiMn2O4 battery, and also Li(NiCoMn)O2 battery, which are widely used in Electric Vehicle, Electric Bicycles, Power tools, Industrial miner's lamp, UPS, other industry and military fields, etc. With Advanced production equipment, professional manufacturing team, proficient production skills, we can produce more than 120000Ah per day. We have high-precision coating machine from Hirano Tecseed Co. Ltd (Japan), full-automatic Slitter Machine from Nishimura Mfg. Co., Ltd. (Japan), and full-automatic Filling Machine from Hibar systems limited (Canada), and many other imported production equipment or domestic high-end auxiliary equipment to ensure our products high quality and consistency. XINCHI products will not only be tested during every step of the whole production process, but also exfactory inspection will be taken, for example over discharge, anti-aging, short circuit, drop, extrusion, prickling, and other safety inspection. Advanced testing equipment and professional quality inspection system are an efficient guarantee to the quality of our products. Therefore, every index of XINCHI products is better than national standard. At the moment, all the batteries of our company has got ISO,CE ,UN38.3,MSDS and ROHS certificates.
      • 7 Years Ago
      Thanks to Jason from the RC Airplane community. I use Lipo's in my RC airplanes all the time. Going from NiCds and NiMHs to lithium was the greatest move I made. They are much lighter weight for their power output and are higher capacity as well. I will never go back. All that said, I am always paying attention to them during charging, and double check charge rates to make sure they don't cook and explode as shown in the video. I even charge them in a metal trashcan just to be on the safe side.

      If you do things right, they are awesome. But all it takes is a short while soldering a connector on to ruin your day(garage, workshop, car, etc)
      • 7 Years Ago
      Gee, I've managed to charge my cell phone every night without burning down my house.

      Useless propaganda.
      • 7 Years Ago
      You've gotta be kidding me. Why don't you show a video of some baby being buried alive in a pile of lithium polymer batteries while you're at it and talk about the dangers of piling up batteries.

      If I pump too much juice into anything, it'll likely melt or catch on fire. Every NiCad battery I've ever used had some warning on it about not misuse it.

      I think I understand the point of the post, but this video is not very helpful in any discussion.
      • 7 Years Ago
      • 7 Years Ago
      First, I think someone needs to learn the difference between lithium-ion (li-ion) batteries and lithium-polymer (li-po) batteries.

      Second, these videos were made for the RC community. I happen to have a couple li-po batteries for my RC truck, and yes, they are this dangerous. The card that comes with them has a big disclaimer on it that warns you to store and charge them in fireproof containers, and to do so away from anything that might burn. It also specifies temperature ranges at which they should be kept, etc.

      In the RC community, you can use a few different kinds of batteries for one application... and the chargers that you use to charge those batteries aren't necessarily made specifically for those types/brands of batteries. For example, I can pick up a battery charger at a hobby shop that's not designed to charge li-po batteries, and since RC hobbyists solder tehir own kinds of connectors on all of their equipment, that doesn't stop me from physically plugging a li-po battery into a li-ion only charger. Doing so WILL result in what you see in those videos.

      This isn't the same as a li-po battery in a cell phone, where circuitry is in place to prevent over-charging the battery. Said circuitry might not be in place in RC applications, as each manufacturer is different and there aren't a lot of rules regarding what they can and can't do. Plus, as I said, batteries and chargers are constantly mis-matched and people don't know enough to always pick the right charger for the type of battery they're using.
      • 7 Years Ago
      This is Stupid, Lipo are dangerous if you are an idiot, but they are far from the most dangerous.. Lithium Ions are much greater threat as they have more chance of exploding if you say use them in a car or bike and then crash..Lipo tend to expand but not explode in that type of event.

      Also almost all Lithium Batteries come with BMS Boards that balance and protect the cells so these events don't happen...(such as overcharging or over use(letting the cells drop below a certain voltage where the cells reverse and short circuit and possibly explode)

      All this guy has done is connect a lipo directly to a charger, and let it cook. Under normal conditions with the right gear...proper lipo charger and good lipo batts with BMS boards this would not happen.
      • 7 Years Ago
      Don't leave Li-Po unattended during charging?

      So sit there for 4 hours to make sure it doesn't blow up?

      Basically, this video is saying, if you're REALLY stupid, the battery will explode.