Methods for testing the quality of lithium-ion battery equipment
1. The fastest way to test a lithium-ion battery is to test its internal resistance and maximum discharge current. High-quality lithium-ion batteries have very low internal resistance and a large maximum discharge current. Using a multimeter with a 20A range, directly short-circuit the two electrodes of the lithium-ion battery. The current should generally be around 10A, or even higher, and should remain relatively stable for a period of time; this indicates a good battery.
2. Examine the appearance; the overall appearance is more substantial. For example, lithium-ion battery devices with a capacity of around 2000mAh tend to be larger. The workmanship is also more refined, or the packaging appears more substantial.
3. Check the hardness; you can gently squeeze or moderately pinch the middle part of the lithium-ion battery device. If the hardness is moderate and there is no soft squeezing feeling, it proves that the lithium battery cell is a relatively high-quality cell.
4. Check the weight; remove the outer packaging and feel the weight of the battery. If it is heavy, it is a high-quality battery cell.
5. If the battery terminals do not get hot after discharging continuously for about 10 minutes during the operation of the lithium-ion battery equipment, it proves that the battery protection board system is perfect. Generally, lithium-ion battery equipment with a high-quality protection board is of better quality than ordinary lithium-ion battery equipment.
The performance testing of lithium-ion batteries mainly includes power supply, internal resistance, capacity, internal threads, self-discharge rate, cycle life, sealing performance, safety performance, storage performance, appearance, etc. Other tests include overcharge, over-discharge, solderability, corrosion resistance, etc. When selecting a battery testing system, the capacity range and required voltage range of the battery or battery pack to be tested should be considered. Battery testing systems can be divided into micro-current range equipment and high-current range equipment according to the current range. (1) The current range of micro-current range testing equipment is from a few milliamps to a few amps, such as 1mA, 2mA, 5mA, 10mA, 100mA, 500mA, 1000mA, 1800mA, 3000mA, 5000mA, etc. (2) The current range of high-current range testing equipment is from a few amps to several hundred amps, such as 10A, 20A, 40A, 60A, 100A, etc.
Compared with other rechargeable batteries, lithium-ion batteries have advantages such as high energy density, high voltage, long lifespan, and no memory effect. In the future, with further improvements in lithium-ion battery manufacturing processes and battery performance, lithium-ion batteries will occupy the mainstream market in fields such as energy storage batteries and power lithium batteries. There are many well-known foreign manufacturers of lithium-ion battery performance testing systems, and among the leading domestic manufacturers, their lithium-ion battery performance testing equipment is highly praised and far ahead in the battery testing industry.
