How do we know whether the battery is rechargeable or not?

I. rechargeable battery

1. Charging rate (c-rate)

C is the first letter of Capacity and is used to represent the value of current during charging and discharging.

For example, when the rated capacity of rechargeable battery is 1100mAh, it means that the discharge time can last for 1 hour with 1100mAh (1C); if the discharge time can last for 5 hours with 200mA (0.2c), the charging can also be calculated according to this comparison.

2. Cut-off voltage (cut-off voltage)

Refers to the battery discharge, the voltage drop to the battery should not continue to discharge the lowest operating voltage value.

According to different battery types and different discharge conditions, the requirements for the capacity and life of the battery are also different, so the prescribed termination voltage of the battery discharge is also different.

Teach you how to use a multimeter to determine the quality of rechargeable batteries

3, open circuit voltage (OpencircuitvoltageOCV)

When the battery does not discharge, the potential difference between the battery poles is called the open circuit voltage.

The open-circuit voltage of the battery will be different according to the material of the battery positive and negative electrode and the electrolyte. If the material of the battery positive and negative electrode is exactly the same, the open-circuit voltage will be the same regardless of the size of the battery and the change of geometric structure.

4. Discharge depth (DepthofdischargeDOD)

During the use of the battery, the percentage of the capacity released by the battery to its rated capacity is called discharge depth.

The discharge depth is closely related to the charging life of the secondary battery. The deeper the discharge depth of the secondary battery is, the shorter its charging life will be. Therefore, deep discharge should be avoided as far as possible.

5. Over discharge

If the battery in the process of discharge, more than the battery discharge of the terminal voltage value, also continue to discharge may cause the battery voltage rise, positive and negative active material reversible damage, so that the capacity of the battery significantly reduced.

6. Overcharge

During charging, if the battery continues to be charged after reaching the full state, it may lead to the increase of internal pressure, battery deformation, night leakage and other conditions, and the battery performance will be significantly reduced and damaged.

Teach you how to use a millimeter to determine the quality of rechargeable batteries

7. Energy density (Energy density)

The amount of electrical energy released per unit volume or mass of a battery.

In general, the energy density of lithium-ion batteries is 2.5 times that of nickel-cadmium batteries and 1.8 times that of nickel-hydride batteries in the same volume. Therefore, in the case of equal battery capacity, lithium ion batteries will be smaller and lighter than nickel-cadmium and nickel-hydride batteries.

8. Self-discharge

No matter whether the battery is used or not, it will cause the phenomenon of power loss due to various reasons.

If the unit of a month to calculate, lithium ion battery self-discharge is about 1%-2%, nickel hydrogen battery self-discharge is about 3%-5%.

9. Charging Cycle life (Cyclelife)

After repeated charging and discharging, the battery capacity of rechargeable batteries gradually drops to 60%-80% of the initial capacity.

10. Memory effect

In the process of battery charging and discharging, many small bubbles will be generated on the battery plate. Over time, these bubbles will reduce the area of the battery plate and indirectly affect the capacity of the battery.

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