Product Description
Li-Ion Battery 104050 3.7v 2500mAh 9.25wh Rechargeable Lithium
Polymer Battery For Hearing Aids
| NO. | Items | Specifications |
| 1 | batteries | 3.7v 2500mah lipo battery |
| 2 | Charge voltage | 4.2V |
| 3 | Nominal voltage | 3.7V |
| 4 | Nominal capacity | 2500mAh 0.2C Discharge |
| 5 | Charge current
| Standard Charging:0.5C
Rapid charge: 1.0C |
| 6 | Standard Charging method | 0.5C CC(constant current)charge to 4.2V, then CV(constant voltage
4.2V)charge till charge current decline to ≤0.05C |
| 7 | Charging time
| Standard Charging:2.75hours(Ref.)
Rapid charge: 2hours(Ref.) |
| 8 | Max.charge current | 1.0C |
| 9 | Max.discharge current | 1.0C |
| 10 | Discharge cut-off voltage | 2.5V0.25V(0.2C) |
| 11 | Operating temperature | Charging: 0 °C ~45 °C
Discharging:0 °C ~45 °C |
| 12 | Storage temperature | -10°C~ +45 °C |
| 13 | Dimension | Length:50±2mm (not including tabs)
Width:40±0.5mm
Thickness:10±0.2mm |
| 14 | Drop Test | The cell is to be dropped from a height of meter twice onto
concrete ground. No fire, no leakage |
| 15 | cycle time | ≥500times |
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.
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