Skip to content

RE: Safety requirements of Li-ion rechargeable battery

March 8, 2011

In order to your safety when you use Li-ion rechargeable battery, pls note some advices as following.

How to choose a safe Li-ion rechargeable battery?

  1. The safe Li-ion rechargeable battery must have control board inside.
  2. You can find a battery’s safety certificate on the battery, i.e. PSE
  3. The battery has many kinds itself protections
    1. Overcharged protection

b.  Discharged protection

  1. Short-circuit protection

d.  High/Low temperature protection

Overheated or overcharged Li-ion batteries may suffer thermal runaway and cell rupture, and in extreme cases this can lead to combustion. Deep discharge may short-circuit the cell, in which case recharging would be unsafe. To reduce these risks, Lithium-ion battery packs contain fail-safe circuit that shuts down the battery when its voltage is outside the safe range of 3–4.2 V per cell. When stored for long periods the small current draw of the protection circuitry itself may drain the battery below its shut down voltage; normal chargers are then ineffective. Many types of lithium-ion cell cannot be charged safely below 0°C.

Other safety features are required in each cell:

  • shut-down separator (for over temperature)
  • tear-away tab (for internal pressure)
  • vent (pressure relief)
  • thermal interrupt (over current/overcharging)

These safety features increase costs compared to nickel metal hydride batteries, but for your own or your consumers’ safety, these safety features are necessary.

Those very cheap lithium-ion batteries and products using them on the market tend to catch fire when being used or charged.  More and more accidents of this kind, http://www.geomangear.com/index.php?main_page=page&id=17 as one of the recent examples, have happened and thus drew governments’ attention to regulate the rechargeable battery.

Product manufacturers and their following distributors/dealers should not pursue excess cost-down at the cost of end-users’ safety and property.

Advertisements

From → News

Leave a Comment

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: