Panasonic HHR160A manual Features

NICKEL METAL HYDRIDE BATTERIES - CONTINUED

The hydrogen-absorbing alloy negative electrode successfully reduces the gaseous oxygen given off from the positive electrode during overcharge by sufficiently increasing the capacity of the negative electrode which is the same method employed by Ni- Cd batteries. By keeping the battery’s internal press- ure constant in this manner, it is possible to seal the battery.

		Charge	O H	OH
MHx
	H	H+	H+	Ni
		Discharge
H		H+	O	OH
	H		H+	Ni
M
(Negative Electrode			(Positive Electrode
Hydrogen-absorbing Alloy)			Nickel Hydroxide)

Schematic Discharge of Ni-MH Battery

Features

•Similarity with Ni-Cd batteries

These batteries have similar discharge characteris- tics to those of Ni-Cd batteries.

•Double the energy density of conventional

batteries

Nickel-metal hydride batteries have approximately double the capacity compared with Panasonic’s standard Ni-Cd batteries.

	1.8
		Size		: KR17/43
	1.6	Charge		: 1CmA X 1.2h
		Discharge		: 0.2CmA
		Temperature: 20˚C
(V)	1.4
Voltage	1.2
	1.0
		P-120ASHHR160A HHR200A
			Ni-Cd	Ni-MH Ni-MH

0.8

0200 400 600 800 1000 1200 1400 1600 1800 2000

Discharge Capacity (mAh)

•Cycle life equivalent to 500 charge and discharge cycles

Like Ni-Cd batteries, nickel-metal hydride batteries can be repeatedly charged and discharged for about 500 cycles. (example: IEC charge and discharge conditions)

•Rapid charge in approx. 1 hour

Nickel-metal hydride batteries can be rapidly charged in about an hour using a specially designed charger.

•Excellent discharge characteristics

Since the internal resistance of nickel-metal hydride batteries is low, continuous high-rate discharge up to 3CmA is possible, similar to Ni-Cd batteries.

Capacity (mAh)

2200

2000

HHR200A

1800 Ni-MH

1600

HHR160A

1400 Ni-MH

1200 P-120AS

1000 Ni-Cd

800

600

400

0 1 2

Size : HR17/43

Charge: 1CmA X 1.2h

Temp.: 20˚C

345

Discharge Current (A)

NICKEL METAL HYDRIDE HANDBOOK, PAGE 9 August 2000