I. Let's start with the battery cells, which are mainly soft pack lithium-ion batteries and 18650 models. Soft pack lithium-ion batteries, also known as polymer cells, are a paste-like battery that can be formed into various shapes, hence the industry term "soft pack." Their capacity is calculated through mathematical formulas, and the soft pack batteries on the market are generally attractive and unique in design. They have a high safety factor, but there is a relatively higher chance of swelling and combustion. The 18650 is a liquid lithium-ion battery, with "18" and "65" indicating the cell size, and "0" indicating its cylindrical shape. They have a high capacity, up to 3000mAh, but there is a risk of explosion, with a lower safety factor. The likelihood of explosion can be significantly reduced if an outer packaging protection panel is attached.
The protective board is designed to automatically regulate during overcharging or over-discharging of the power source, automatically shutting off the charging function once fully charged. It also enhances conversion rates and reduces the impact of resistance on charging.
Appearance: Believe it or not, the appearance is one of the primary factors for many friends when choosing a mobile power bank. A stylish look can add a lot of fun. For the same volume, a higher capacity highlights the portability of the mobile power bank, enhancing its practicality. Aviation Ground Power 2, 36V Aviation Power 1, 400HZ Frequency Conversion Power Supply 7, 115/200V Power Supply 2, 27V DC Power Supply 5, 400HZ Power Supply 12, Aviation Power Supply
Four, Electrical Parameters 1. Charging Voltage and Current: The charging voltage typically requires 5V, which can be compatible with most phone adapters. The charging current theoretically should be as high as possible for faster charging. However, actual use should be mindful of heating issues. 2. Battery Cell Capacity: Generally, battery cell capacity is proportional to volume; larger volume equals larger capacity. Opt for products with higher capacity within the same volume. 3. Output Voltage and Current: The output voltage must be 5V. The discharge current should also ideally be as high as possible for faster charging. Actual use should consider heating issues and the characteristics of digital products. 4. Protection Parameters: The product should have overvoltage, overcurrent, and undervoltage protection measures. These parameters determine the charging speed, charging time, and safety of the portable power bank, which is greatly related to daily use. 5. Battery Cell Selection: The battery cell is a crucial component of a portable power bank. The quality of the battery cell essentially represents the quality of the power bank product. Therefore, it is the primary selection to be made. There are several types of rechargeable lithium-ion battery cells on the market, including polymer cells, aluminum shell cells, steel shell cells, and cylindrical metal shell cells (commonly 18650 cylindrical cells). Aluminum shell cells are mainly used for phone batteries, steel shell cells are too basic and are rarely used, while polymer and cylindrical cells are primarily used for power banks.
