Panasonic HHR160A user manual

Summary of the content on the page No. 1

NICKEL METAL HYDRIDE BATTERIES
Overview Construction
As electronic products have come to feature more Nickel-metal hydride batteries consist of a positive
sophisticated functions, more compact sizes and plate containing nickel hydroxide as its principal active
lighter weights, the sources of power that operate material, a negative plate mainly composed of hydro-
these products have been required to deliver in- gen-absorbing alloys, a separator made of fine fibers,
creasingly higher levels of ene

Summary of the content on the page No. 2

NICKEL METAL HYDRIDE BATTERIES - CONTINUED Structure of Nickel Metal Hydride Batteries Safety Vent Cap Cap (+) Sealing Plate Insulation Ring Safety Vent Insulation Ring Positive Sealing Electrode Insulator Electrode Collector Negative Electrode Positive Electrode Negative Electrode Separator Case ( ) Case Separator Positive Electrode Insulator Prismatic Type Cylindrical Type Principle of Electrochemical Reaction Involved in Batteries Principle of Electrochemical Reaction Hydrogen-absorbing A

Summary of the content on the page No. 3

NICKEL METAL HYDRIDE BATTERIES - CONTINUED The hydrogen-absorbing alloy negative electrode Features successfully reduces the gaseous oxygen given off • • • • • Similarity with Ni-Cd batteries from the positive electrode during overcharge by These batteries have similar discharge characteris- sufficiently increasing the capacity of the negative tics to those of Ni-Cd batteries. electrode which is the same method employed by Ni- • • • • • Double the energy density of conventional Cd batteries. By

Summary of the content on the page No. 4

NICKEL METAL HYDRIDE BATTERIES - CONTINUED Five Main Characteristics • Charge temperature characteristics at various charge rates As with Ni-Cd batteries, nickel-metal hydride batteries have five main characteristics: charge, discharge, 110 storage life, cycle life and safety. 1C 100 • • • • • Charge characteristics Like Ni-Cd batteries, the charge characteristics of nickel- 90 Charge 0.33C 0.1C metal hydride batteries are affected by current, time and 80 0.1C x 12h temperature. The battery volt

Summary of the content on the page No. 5

NICKEL METAL HYDRIDE BATTERIES - CONTINUED • Discharge temperature characteristics at 1C discharge Self-discharge is affected by the temperature at which the batteries are left standing and the length of time during which they are left standing. It increases 2.0 Charge : 1CmA x 1.2h in proportion as the temperature or the shelf-standing 1.8 Temperature: 20˚C time increases. Panasonic’s nickel-metal hydride Model : HHR160A 1.6 batteries have excellent self-discharge 20˚C 1.4 characteristics tha