Introduction of Nickel Hydrogen Battery Parameters

Any type of nickel-metal hydride battery should set the parameters of the specification, and some of the parameters should be reflected in the product specification when facing the market. In general, nickel-metal hydride battery parameters include the following:

Core parameters that determine battery performance:

1, nominal capacity: the capacity of the power cell depends on the number of active substances, and the content of active substances by the battery

The material and volume are determined, so the larger the battery, the higher the capacity.

2, nominal voltage: When the battery is just delivered, the potential difference between the positive and negative poles is the nominal voltage. The nominal voltage of a unit nickel-metal hydride battery is 1.2 V. The nominal voltage is determined by the electrode potential of the electrode material and the concentration of the internal electrolyte. When the ambient temperature, service time, working state, and residual power change, the unit cell The output voltage will change.

3, the internal resistance of the battery depends on the resistance of the plate and the impedance of the ion flow. In the process of charging and discharging, the resistance of the polar plate is not

Variable, the impedance of the ion flow will change with the change of electrolyte concentration and the increase or decrease of charged ions.

4, after the nickel-metal hydride battery is charged, the active material of the polar plate has reached saturation, and the charging voltage will not increase. The voltage at this time is called the termination voltage, and the termination voltage of the nickel-metal hydride battery is 1.4 V.

5, the discharge termination voltage is the minimum voltage allowed when a nickel-metal hydride battery is discharged. It continues to discharge under the discharge termination voltage state, and the voltage at both ends of the battery will rapidly drop, forming deep discharge and over-discharge. In this way, the product formed on the polar plate is not easy to recover when charging normally, affecting the battery life.

6, charging and discharging current: must have the maximum current regulations. Because the high current will impact the stability of the battery structure.

Second, indicators of battery performance:

1, cycle life: a full charge and discharge process is considered as a recharging cycle of nickel-metal hydride batteries, the battery repeated charging constitutes the battery's cycle life. The charging cycle of nickel-metal hydride batteries is in accordance with IEC standards. Usually, nickel-metal hydride batteries should have a life of 500 times.

2, specific energy: The commonly used standard is:(1), energy/weight is 30 ~ 80 wh/kg (watt hours/kg); (2), Energy/volume is 140 ~ 300 wh/L (watt hours/l).

III. Parameters for the description of battery physical properties

Weight: The nickel-metal hydride battery is the heaviest of the same type of battery.

2, model: named according to relevant standards, such as commonly used AAA, AA, etc.

3, shape size: a single section of the battery to mark the diameter and height, combined batteries are usually expressed in three-dimensional numbers.

4, external packaging and spray code printing.

Sometimes not all of the above parameters appear in the product description, but some important parameters must be indicated, such as the core parameter section.

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