Reference of Lithium Ion Rechargeable Battery

OVERVIEW

THE BEST CHOICE FOR PORTABLE ELECTRONIC DEVICES_______
LITHIUM ION BATTERIES

REACTION PRINCIPLE

Li-ion battery contains lithium oxide instead of metal lithium. It makes use of lithium cobalt oxide
as the positive electrode and specialty carbon as the negative electrode, Only lithium ions move
between the positive and the negative poles. The ions are ionized from positive material and
move to the negative electrode during charge. During discharge, the ions move to the positive
electrode and return to the original compound.
The reaction for charge and discharge are shown as below:

Schematic Diagram of the Chemical Reaction of the Lithium Ion Battery

　

FEATURE

High Energy density

Li-ion battery boasts a higher energy density than Ni-Cd battery and Ni-Mh battery because of its high voltage and light weight.

Flat Discharge Voltage

The use of special carbon creats an extremely Flat discharge voltage profile.

Usually cycle of Li-ion batteries is Approximately 500 times.

Hight Voltage

Voltage of 3.7V is approximately therr fimes of rechargeable Ni-cd batteries or Ni-Mh batteries.
It makes possibly to produce smaller and lighter devices.

No Memory Effect Absolutely

Li-ion batteries have none of the memory effects seen in other rechargeable batteries.

BUTTON TYPE LITHIUM-ION BATTERY

• Voltage is high, with average operating at 3.6V. it is approximately three times that
  Of Ni-Cd and Ni-Mh rechargeable batteries.

• Charge / discharge cycle characteristics are excellent.

• Self-discharge is minimal, at fewer than 10%per month.

• There is no memory effect.

• Working temperature is suitable for a wide range, it can work under such a
  Circumstances of -20~60℃.

• The output power is relatively high even though the size is small.
  

  Model Number	Nominal Voltage (V)	Nominal Capacity (mAh)	Typical Capacity (mA)	Max Charge And Discharge Current (mA)	Pulse Current (mA)	Resistance (mΩ)	Max Dimension Φ x H (mm)
  LIR2025	3.6	20	4	20	50	2000	20.0 X 2.8
  LIR2032	3.6	35	7	35	87	2000	20.0 X 3.5
  LIR2430	3.6	40	8	40	100	2000	24.5 X 3.4
  LIR2450-I	3.6	80	16	80	200	2000	24.5 X 5.4
  LIR2450-II	3.6	110	22	110	275	2000	24.5 X 5.4
  LIR2450-III	3.6	140	28	140	350	2000	24.5 X 5.4
  LIR2477	3.6	130	26	130	325	2000	24.5 X 8.1

　

PRISMATIC LITHIUM-ION BATTERY

• Energy density is high, it attains volumetric energy density of 370wh/l and gravimetric energy density of 150wh/kg.

• Voltage is high, with average operating voltage at 3.7v. It is approximately three times that of Ni-Cd and Ni-Mh rechargeable batteries.

• Charge/discharge cycle characteristics are excellent; batteries may be put through 500 or more cycles.

• Self-discharge is minimal, at fewer than 10% per month.

• There is no memory effect such as those in Ni-Cd and Ni-Mh rechargeable batteries.

• Carbon material, rather than metallic lithiym or lithium alloy, is used as the anode material The lithium ion state is maintained over a wide range of operating conditions, for excellent safety.

• Working temperature is suitable for wide range, it can work under such circumstances of -20~60℃.

• Quick charge is available, only 70minutes can we charge the battery to saturation under the condition of 1CmA.
  

STRUCTURE

TO USE SAFELY- PCBS

In order to ensure batteries working safely, please choose authorized PCBs.

The Overcharge Safety Function

The charge will stop when the voltage rises 4.35±0.05V.

The Overdischarge Safety Function

The discharge will stop when the voltage falls below 2.50±0.06V.

The Range of Work Voltage

The set works about 3.10~4.20V

The controller IC

The controller IC measures the voltage of each cell and shuts off a control switch to prevent either overcharging or discharging. Moreover, the voltage of the control switches will be shut off if the voltage exceeds specification.

The Control Switch

The control switches usually comprise FET structures, and turn off the charge or discharge depend on the output of the controller IC.

Charging Method (Recommendations)

1. Charge Voltage

The max output voltage of the charger should be no more that 4.25V

2. Charge current

The reference charge current should be 0.7C mA.

3. Charge Ambient Temperature

0℃~ 45℃ is suitable.

4. Low - Voltage battery Charge

Charge current will keep at 0.1C mA or less when the voltage per cell is lower that 3.10v.

CAUTION

The temperature range which charge battery is 0℃~ 45℃. Charging battery out of this range may harm the performance or reduce life expectancy.

The temperature range which discharge battery is -20℃~60℃. Using the battery out of this range may damage or reduce life expectancy.

Please store battery in -20℃~60℃ to keep its performance and expectant life.

Please don't place battery in microwave, cookware, or high-pressure container.

Please keep battery away from young children. If a device with battery is used by young ones, adult should explain the user manual to the children.

 

WARNING

Don't place battery in fire or heat it.

Don't connect the positive terminal and the negative terminal directly with any conductor such as metal.

Don't pierce, strike, or step on the battery, or otherwise subject it to strong impacts.

Don't expose battery to water of salt water, or allow battery wet.

Don't solder directly.