Li-Ion Battery 104050 3.7v 2500mAh 9.25wh Rechargeable Lithium Polymer Battery For Hearing Aids

Advantages:

Safety design‌:Equipped with a protection board, supports overcharge, over-discharge, short circuit and other protection functions ‌

‌Physical characteristics‌: Soft package design, weight about 40-47 grams, internal resistance 60mΩ ‌

‌Cycle life‌: Typical cycle times 300 times (charging upper limit 4.2V) ‌

Main advantages ‌Light and thin features‌: Thickness can be as low as 0.5mm, suitable for space-constrained equipment ‌

‌Flexible shape‌: Can be customized in a variety of shapes, suitable for medical instruments, aircraft models and other special-shaped equipment ‌

‌Low temperature performance‌: Some models support -20℃ operating temperature, outstanding cold resistance ‌

‌High discharge rate‌: Theoretical discharge capacity is 10% higher than that of lithium-ion batteries of the same volume ‌

Typical applications ‌Medical equipment‌: Breast pump, handheld terminal ‌

‌Digital products‌: Mobile power, drones, smart locks ‌

‌Industrial equipment‌: Monitoring equipment, instruments and meters

1. The essential difference between electrolyte morphology and structural design:

Lithium-ion batteries use a liquid electrolyte system, and their positive and negative electrode materials achieve ion conduction through lithium salts immersed in organic solvents. The typical structure includes multi-layer wound electrode sheets and metal shell packaging. This design gives it high structural stability, but also limits the freedom of shape. In contrast, lithium polymer batteries use solid or gel polymer electrolytes instead of traditional liquid electrolytes, and the electrode layers and diaphragms can be stacked in a planar manner through a lamination process. This structural characteristic enables it to have a customizable appearance, which can adapt to ultra-thin, curved or irregular installation spaces, and shows unique advantages in the field of smart wearable devices.

2. Performance game between energy density and power output:

In terms of energy density, lithium polymer batteries have improved their energy density per unit volume by about 10%-15% compared with traditional lithium ion batteries by optimizing electrode composite materials and packaging processes. This is mainly due to the higher tolerance of polymer systems to active substances and more compact internal space utilization. However, the liquid electrolyte system still has an advantage in ion conduction rate, which makes lithium ion batteries have better power output characteristics in high current discharge scenarios. Experimental data show that under 3C rate discharge conditions, the capacity retention rate of lithium ion batteries is 8%-12% higher than that of lithium polymer batteries, which makes them more suitable for the field of power tools that require instantaneous high power output.

3. Safety mechanism and thermal runaway prevention:

Safety is the core consideration of the evolution of battery technology. The solid electrolyte system of lithium polymer batteries significantly reduces the risk of electrolyte leakage, and its aluminum-plastic film soft packaging structure is more likely to achieve pressure release through local bulging when mechanically damaged, rather than explosive rupture. However, the polymer system has the risk of thermoplastic deformation under high temperature conditions, and it is necessary to improve the structure through additives to maintain structural stability. Although the steel shell packaging of lithium-ion batteries can provide stronger physical protection, it may cause a violent chain reaction when the internal short circuit occurs, which puts higher requirements on the temperature control accuracy of the battery management system (BMS).

4. Manufacturing process and cost structure analysis:

In terms of production process, the winding process and automated production line of lithium-ion batteries are highly mature, and the scale effect keeps their unit cost at a low level. However, the stacking process of lithium polymer batteries requires higher precision, and the stacking alignment error needs to be controlled within ±0.1mm, resulting in technical bottlenecks in improving the yield rate. The material cost structure shows that the price of polymer electrolytes is about 30% higher than that of liquid electrolytes, but the cost of aluminum-plastic film packaging is only 60% of that of metal shells. This increase and decrease in cost structure has led to a differentiated competitive landscape for the two types of batteries in the field of consumer electronics.

5. Application scenarios and market positioning:

Lithium-ion batteries dominate the electric vehicle power battery market with their mature industrial chain and cost advantages. Their standardized sizes (such as 18650, 21700) and modular design facilitate large-scale integration and cascade utilization. Lithium polymer batteries dominate the consumer electronics sector, with smartphones, true wireless headphones and other products strongly relying on their thin and light features. It is worth noting that with the breakthrough of solid-state battery technology, lithium polymer systems are gradually penetrating into the electric vehicle sector, while lithium-ion batteries are also improving their energy density through material innovations such as silicon-carbon negative electrodes, and the two technology routes are showing a trend of integration.

Pictures: