A lipo battery pack, or lithium polymer battery pack, is a type of rechargeable battery commonly used in various applications such as RC vehicles, drones, electric vehicles, and portable electronics. It’s part of the lithium-ion family but differs in its construction and performance characteristics, which make it ideal for devices that require high power output with minimal weight.
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A lipo battery pack is composed of several lipo cells connected together. These cells are usually made of lithium cobalt oxide or lithium iron phosphate materials, depending on the battery’s application. The cells are connected in series or parallel to create the desired voltage and capacity.
Additionally, most lipo battery packs contain a battery management system (BMS). The BMS protects the cells from overcharging, over-discharging, and ensures each cell is balanced, which is crucial for safe operation.
It’s important to understand the difference between a lipo cell and a lipo battery pack, as they’re often used interchangeably but serve different purposes. Here’s a more detailed comparison:
In essence, a lipo cell is a single battery unit with a defined voltage, while a lipo battery pack is a collection of cells that work together to provide the power necessary for more demanding applications.
When looking at a lipo battery pack, you’ll often see numbers like 3S mAh or 6S mAh. These numbers might seem confusing at first, but they’re actually essential in understanding the pack’s configuration and performance.
While both lipo and lithium-ion battery packs belong to the same family of batteries, there are significant differences that affect their performance and suitability for specific applications. Here’s a more in-depth comparison:
Lipo battery packs are typically preferred for applications that need a lightweight, high-performance battery capable of delivering quick bursts of power. In contrast, lithium-ion packs are better for long-term power supply needs, as they offer better durability and safety features.
Building your own lipo battery pack might seem daunting, but with the right tools and understanding, it can be a rewarding project. Here’s how you can make your own custom battery pack:
Connect the Battery Management System to ensure that each cell in the pack is balanced. This prevents issues like overcharging, which can lead to swelling or, in extreme cases, fires.
Before using the pack, test it to ensure that all cells are functioning properly and that the BMS is managing the cells correctly.
Once everything is connected and tested, insulate the battery pack to avoid short circuits and enclose it in a durable casing to protect it from external damage.
Charging a lipo battery pack requires a specific type of charger designed for lithium polymer batteries. Unlike regular chargers, a lipo charger includes features to balance the cells and prevent overcharging.
Key aspects of a lipo battery charger:
Always use a charger that’s compatible with the voltage and capacity of your battery pack. Avoid using a charger designed for lithium-ion batteries, as it may not provide proper balancing.
Swelling in lipo battery packs is a common issue and occurs when the battery undergoes internal damage or overcharging. It’s typically caused by the buildup of gas inside the battery due to chemical reactions during improper usage.
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Common causes of swelling:
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If your lipo battery pack swells, stop using it immediately. Dispose of it properly, as swollen lipo batteries can be dangerous. Never puncture or attempt to drain a swollen battery.
Proper charging and maintenance are critical for extending the lifespan of your lipo battery pack. Here are a few essential tips:
Lithium polymer battery is developed on the basis of liquid lithium ion battery. The anode and cathode materials of lithium polymer battery are the same as liquid lithium ion battery, but it uses gel electrolyte and aluminum plastic film as the outer package, so it was lighter and thinner, higher energy density and safety features, and is widely favored by customers at home and abroad.
The weight of a lithium-polymer battery is half that of a nickel-cadmium or nickel-hydride battery of the same volume, and the volume is 40-50% that of nickel-cadmium and 20-30% that of nickel-hydride, making it a large-capacity battery of the same volume.
Liquid lithium battery adopts the method of first customizing the shell and then plugging the positive and negative electrode materials. There is a technical bottleneck when the thickness is below 3.6mm, while the polymer cell does not have this problem. The thickness can be less than 1mm, which is in line with the development direction of applications thinning.
The internal resistance of the polymer batteries is less than liquid batteries, the current domestic internal resistance of the polymer batteries can even do below 35 m Ω, greatly reduced the battery power, can effectively extend the standby time of the applications.
Polymer battery can increase or reduce cell thickness according to customer demand, the development of new cell model, cheap price, mold opening cycle is short, some even according to the shape of applications tailored shaped battery, to make full use of battery shell space, improve the battery capacity.
The constant current and constant voltage charger with a rated voltage of 4.2V can make the lithium polymer battery fully charged in one to two hours. Polymer batteries use colloidal electrolytes, which have more stable discharge characteristics and higher discharge platform than liquid electrolytes.
The operating voltage of a single lithium-polymer cell is 3.7v (average), equivalent to three nickel-cadmium or nickel-hydride batteries in series.
The outer package is an aluminum-plastic package, which is different from the metal shell of liquid lithium battery. Due to the use of flexible packaging technology, internal quality hidden trouble can be immediately through the outer packaging deformation and show, once the occurrence of safety hidden trouble, will not explode, will only swell.
Under normal conditions, the lithium polymer battery charge and discharge cycle can exceed 500 times.
Lithium-polymer batteries are free of harmful metals such as cadmium, lead, and mercury. Professional battery factories like Grepow have passed the ISO environmental system certification and the products comply with the EU RoHS directive.
Memory effect refers to the phenomenon that the capacity of nickel-cadmium battery decreases during the cycle of charge and discharge. Lithium polymer batteries do not have this effect. The lithium polymer battery is gradually expanding its market share due to its advantages of a lightweight, low mold opening cost, and high safety. Mainly used in digital products, but also gradually to applications, laptops, power tools, and other market development. Grepow is a well-known lithium polymer battery manufacturers, national high-tech special enterprises, providing ultra-safe and ultra-reliable lithium polymer battery customized solutions and products. The voltage, capacity, size, shape, and function of the lithium battery pack can be customized flexibly to meet customers' personalized demand for electricity.
Contact us to discuss your requirements of custom lipo battery pack. Our experienced sales team can help you identify the options that best suit your needs.