Five Methods for Selecting High-Quality Lithium Batteries

With rapid advancements in lithium battery technology, the cost of lithium batteries continues to decrease. Lithium batteries are increasingly valued in industries such as electric bicycles due to their high energy density, lightweight nature, low pollution, and long lifespan.

Currently, the market is flooded with various brands of lithium batteries, making it difficult to distinguish between good and bad ones. Thus, selecting a lithium battery that meets the new national standards has become an urgent need for distributors and consumers alike.

1. Inspection of Appearance and Packaging The quality of a battery can often be initially judged by its appearance and packaging. A professional product is sure to excel in detail. Differences in appearance can help us filter out inferior products.

2. Comparison of Weight The weight of a lithium battery pack is usually proportional to its capacity. For polymer lithium batteries, a significant difference in weight indicates insufficient capacity. However, there may be differences in weight among batteries of different brands. Additionally, lithium batteries that feel heavier in their outer packaging are often of higher quality.

3. Testing of Internal Resistance and Maximum Current The quickest way to assess lithium battery performance is by testing internal resistance and maximum discharge current. High-quality lithium batteries have extremely low internal resistance and high maximum discharge currents. Using a 20A multimeter, short-circuiting the two electrodes of a lithium battery should result in a current of around 10A, which can be sustained for a period, indicating battery stability.

4. Assessment of Working Conditions When lithium battery cells are charged, continuous discharge for about 10 minutes without any overheating at the battery terminals indicates a well-functioning battery protection system. Generally, lithium batteries with high-quality protection boards are better in quality than ordinary lithium batteries.

5. Examination of Battery Cells Undoubtedly, the most crucial component of a battery is its cells. Currently, the most common battery cells used in the market are pouch cells and 18650 cells, both of which are common lithium battery cell materials. Due to the presence of some unscrupulous workshops using old cells in lithium batteries, it's important to first check if they are brand new. Pouch lithium cells, also known as polymer cells, are battery cells with a gel-like electrolyte in a flexible package, ensuring high safety and no explosion risk. Presently, the batteries used in electric vehicles are mainly based on 18650 cells, containing primarily lithium iron phosphate, lithium manganese oxide, and ternary lithium.