lithium-battery-dat
Li-ion VS Li-Poly Battery
| Feature | Li-ion Battery | Li-Poly Battery |
|---|---|---|
| Electrolyte | Liquid or gel electrolyte. Requires a hard casing to contain the liquid. Can be more volatile and prone to leakage if damaged. | Solid or gel-like polymer electrolyte. More stable, flexible, and less prone to leakage. |
| Shape/Size | Typically cylindrical or prismatic in rigid, metal casings. Bulkier design, limiting shape flexibility. | Can be made in custom shapes and sizes, including thinner, flat, or flexible designs, allowing for more space-efficient configurations. |
| Weight/Size | Heavier due to metal casing. Bulkier, typically used for larger devices. | Lighter and more compact due to the flexible polymer casing, ideal for small, thin devices like smartphones and wearables. |
| Energy Density | Generally higher energy density, meaning more power for the same weight and volume. This gives longer battery life in large devices. | Lower energy density than Li-ion batteries, meaning slightly shorter battery life per charge, but improvements in technology can minimize this difference. |
| Durability/Safety | Less durable; susceptible to damage, leakage, or fire if punctured or overcharged. Requires more protective circuitry to prevent overheating and short circuits. | More durable and safer; less prone to leakage, rupture, or combustion. It has a lower risk of damage, making it safer in small, thin devices. |
| Charging Speed | Can charge faster due to higher energy density, and faster charging systems are more commonly available. | Slower charging speed compared to Li-ion due to higher resistance in the polymer electrolyte, though the difference can be minor depending on the device. |
| Lifespan | Typically lasts longer (500-1000 charge cycles), especially for larger applications like laptops, power tools, and electric vehicles. | Shorter lifespan (300-500 cycles) compared to Li-ion, though this may be less of an issue in smaller devices or low-drain applications. |
| Applications | Commonly used in larger, power-demanding devices such as laptops, electric vehicles, and power tools where higher energy density is a priority. | More often used in smaller, portable electronics like smartphones, drones, wearables, and tablets, where compact size and flexibility are important. |
| Cost | More cost-effective per unit of energy and storage, especially in larger battery configurations. | Slightly more expensive to manufacture due to the polymer design and materials used. |
| Performance in Extreme Temperatures | Li-ion batteries generally have a wider operating temperature range, but may degrade faster in high or low temperatures. | Li-Poly batteries are more sensitive to extreme temperatures, potentially leading to quicker degradation in high heat or low cold, though this can depend on the specific chemistry used. |
| Environmental Impact | Higher environmental impact due to the complexity of materials and disposal, though efforts are being made for recycling improvements. | Typically lower environmental impact, with polymer materials that can be easier to recycle than the metals used in Li-ion batteries. However, both types still have significant environmental concerns. |
Low Battery Voltage (Below Safe Threshold)
Protection boards are designed to protect lithium batteries from over-discharge, overcharge, and short circuits. Many lithium battery protection circuits cut off the battery's output if the voltage drops below a certain threshold, often around 2.5V to 2.8V.
If the battery is at 2.6V, it's very close to this cutoff threshold, and the protection circuit may be designed to prevent any further discharge to avoid damaging the battery, which could explain the drop to 0V.
Lithium battery Check
- battery voltage B+/B- = OK, output == 0V, BMS problem