Introduction to the 5th battery voltage category analysis

The No. 5 battery is generally used for the carbon battery of the primary battery, the nickel-cadmium battery of the alkaline battery and the secondary battery, and the nickel-hydrogen battery. Therefore, the voltage of the battery No. 5 varies depending on the battery type, because the carbon battery and the voltage properties of alkaline batteries are the same. Therefore, the voltage of No. 5 battery can be divided into one-time No. 5 battery voltage, Ni-Cd 5th battery voltage and Ni-MH No. 5 battery voltage.

1. The nominal voltage of the disposable No. 5 battery is 1.5V, and the termination voltage is 0.9V. This is the same for alkaline batteries and carbon batteries. The criterion for judging the capacity of a primary battery is actually the discharge time when discharging to 0.9V. This is the most important parameter in performance and the basis of the price of a primary battery.

2. Nickel-cadmium battery: The nominal voltage is 1.2V, the discharge termination voltage is related to the discharge rate, and the termination voltage of the 8-hour rate discharge is 1.10V, and the 5-hour rate is 1.00V.

3. The discharge termination voltage of Ni-MH battery is generally specified as 1.0V, the charge termination voltage is 1.5V, the nominal voltage is 1.2V, and the termination voltage of Ni-Cd and Ni-MH No. 5 batteries is generally between 0.9V and 1.1V. . Due to the popularity of lithium batteries , people often talk about the 5th lithium battery , which is actually equivalent to 14500 batteries, the nominal value of this 5th battery voltage is 3.7V.

The charge and discharge curve can help us understand the phase characteristics of the No. 5 battery voltage.

1. It can be seen from the discharge curve of No. 5 carbon battery and alkaline battery that when discharging with 3.9 Ω, the alkaline battery slows down much, which is the root of the more durable alkaline battery.

2. The performance comparison between nickel-cadmium battery and nickel-hydrogen battery during charging and discharging. When the charging is terminated, the voltage of nickel-cadmium battery No. 5 is much lower than that of Ni-MH battery.

The No. 5 battery voltage is required to be marked on the battery case. In the use of the rechargeable battery, attention should be paid to the influence of overcharge and discharge on the voltage of the No. 5 battery. When overcharge and over discharge occurs, the electrode structure is damaged, and the battery is reversible. It cannot be fully recovered, resulting in permanent damage to battery capacity. The primary battery will also be over-discharged. At this time, the battery voltage of the 5th battery will drop below 0.9V, which will cause leakage and the battery can no longer be used.

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