Typhon Power: 3s lipo battery

2015年7月21日星期二

RC Battery Safety to Use

Lithium Polymer Safety Tips: Lithium Polymer cells are a tremendous advance in battery technology for RC use. However, due to the chemistry of lithium cells, there is a possibility of fire if charging is not properly done. It is unavoidable due to the nature of lithium itself. This is no different from many things we use in daily life – knives, kitchen cleaners, automobiles, for a few examples – which are inherently dangerous, but which can be used safely by adhering to simple rules and precautions.

Batteries should NEVER be left unattended while charging.
Be absolutely sure that the Lithium Polymer charger settings are correct for the battery pack being charged – both voltage and current settings.
Lithium Polymer must be CHARGED and STORED in a fire-safe container like a Lipo Sack.
Do not charge batteries near flammable items or liquids.
Keep a dry fire extinguisher nearby or a large bucket of dry sand, which is a cheap and effective extinguisher.
Never charge inside an automobile even when parked.
KEEP BATTERIES AWAY from children and pets at ALL times.

Connection: Be sure that the correct polarity is observed when connecting battery packs to charger or ESC.

POSITIVE (+) NEGATIVE (-)

Charging/Discharging: Your new battery will arrive half charged. Charge your pack fully before first use. Charge your LiPo battery pack at 5C or less on the LiPo setting only. You must use a balance charging system, otherwise, you risk your pack becoming severely out of balance over time, which will significantly decrease the lifespan.

Do NOT charge your LiPo packs on a NIMH/NICD charger. Your charger must be designed for LiPo cells. Do not charge above 4.2V per cell, over discharge under 3V per cell. Never leave LiPo packs unattended during charging or after a crash in your vehicle. Don’t leave the battery pack plugged into a vehicle while not in use. The pack can still discharge to an unsafe level and damage the pack even if all components are turned off.

It is dangerous to draw more power than what the pack is rated for. This will void any warranty on the pack and can also cause your battery pack to ignite into flames. The temperature of the pack should never exceed 140F degrees. If it does, you may need a pack that is rated to handle more power.

Storage Procedure: When not using your LiPo/Life battery pack, store it at 50% of the pack’s rated capacity. Make sure to cycle your packs at least once per month since leaving them on the shelf for a prolonged period of time can cause the packs to get severely out of balance, puff/swell or even go dead.

Handling Cautions:

Never leave batteries inside a car on a hot day or any other place where temperature may exceed 140F / 60C.
Although environmentally friendly, lithium polymer cells must be FULLY discharged before disposal. Use a resistor setup (light bulbs, for example) to accomplish this, to avoid the possibility of a short-induced fire after disposal.
Immediately discharge damaged batteries at 1/2 C rate and dispose.
Do not put the loose cells in a pocket, bag, or drawer where they could short-circuit against other items, or the battery tabs could be pressed against each other.
Do not place the loose cells on any conductive surface, such as a metal-topped table.
We recommend purchasing pre-assembled packs rather than assembling packs from loose cells.
Take care that the cells are not punctured, especially by metallic objects like hobby knives.
If the electrolyte in the cells should get on your skin, thoroughly wash with soap and water. If in the eyes, rinse thoroughly with cool water. Immediately seek medical attention for this, or for burns.
Although our batteries are now water sealed, we do not recommend submerging our batteries for extended periods of time. The battery packs will be protected during normal rc conditions.

All Lithium Polymer Batteries we carry are only approved for rc use, and may not be used in any other application. Battery discharging, charging, electric motors, spinning propellers, and flying models all have the potential for serious injury to persons and damage to property. In purchasing these products, the user agrees to accept responsibility for all such risks, and not to hold the battery manufacturer, distributors, or retailers - (all including owners and employees) -responsible for any accident, injury to persons, or damage to property.

The use of Lithium Polymer batteries in radio-controlled models is to be considered experimental, and there is no warranty, expressed or implied, by the manufacturer, distributors, or retailers with respect to the capacity, life in cycles, storage, or discharge characteristics of lithium cells in RC use, nor any other use nor aspect unless otherwise stated.

Do not, under any circumstances, attempt to “heat up” your batteries or increase the voltage of a pack above 4.2V per cell using these devices or techniques. Some insidious lithium polymer retailers/distributors have suggested using these devices and techniques to increase the performance of your lithium polymer packs. THIS IS NOT SAFE AND IS LITERALLY PLAYING WITH FIRE!

Devices on the market that heat up lithium polymer batteries can increase the risk of a fire. Lithium polymer cell manufacturers suggest that exceeding 140 degrees is NOT a safe temperature for a lithium polymer cell. At 140 degrees, the pack can become unstable and very dangerous. The small increase in performance is not worth the risk of a fire. PLEASE STAY SMART AND SAFE BY NOT USING THESE PRODUCTS!

Some retailers/distributors of other brands of lithium polymer batteries have suggested that their customers and racers “bump” the voltage of their packs using settings other than the lithium polymer setting on their charger. The manufacturers of lithium polymer cells suggest a voltage range of 3V-4.2V. Increasing voltage above 4.2V per cell is not safe. You should never attempt to charge your packs beyond the voltage set for lithium polymer packs on your lithium polymer charger. Using other battery settings to “bump” the voltage beyond 4.2V per cell can cause fire and injury. The small increase in performance is not worth the risk of fire. PLEASE DO NOT USE THESE METHODS!

2015年6月24日星期三

Polymer Lithium Batteries will explode it?

Lithium batteries "safe" is always an important issue of troubled lithium battery industry. In recent years, exposure of battery explosion without exception are caused by the use of lithium batteries, talking about causes of the explosion, compared with other types of batteries, This is due to the special nature of the lithium battery materials and technology decisions. To do this, you should understand the knowledge of lithium battery exploding, we try to be explained in the following three aspects.

First, what is the battery explode?

Stipulated by national standard, the moment of solid material ejected within any part of the battery was pushed to the lithium batteries over a distance of 25cm,called the explosion. Experiments found is: a circular mesh covering the experimental battery and place battery in the center position, that is, from the guards on either side of 25cm, if the without solid part passed the grilles, then battery unexploded. Here on the "net" specific to show: cable with a diameter of 0.25mm soft aluminum, density network of 6 to 7 / cm.

Second, how to prevent the lithium battery explode?

All lithium battery explosions are caused by a short circuit which caused by the fever, and caused by a short circuit due to another reasons like overcharge, over discharge, positive and negative direct docking, electrolyte leakage. Therefore, in the lithium battery design, you can start from the following:

1, prohibits overcharging to 4.2V or more;

2, prohibit over discharging 2.75V or less;

3, installed explosion-proof valve on a metal shell;

4, short-circuit proof on the process.

Of course, Design process Lithium battery need to have a design for battery protection circuit board. Although this will increase the production cost of lithium batteries, it is necessary for safety to use lithium batteries, all the normal lithium battery manufacturer's products are inevitably this design.

Third, polymer lithium batteries will explode it?

Lithium polymer battery is the use of flexible packaging and polymer electrolyte made of a lithium battery products, under normal usage circumstances, storage will not explode unless damage caused artificially strong short-circuited.

To reduce the explosion happened, lithium polymer is used by more and more occasions, although lithium batteries replace other types batteries are still alternatives, in the type of lithium battery, the lithium-polymer battery has already begun to replace ordinary lithium batteries in some field.