HouYou Ploymer Cell Manufacturer

Lithium-ion batteries are widely used in various electronic products such as mobile phones, laptops, tablets, digital cameras, electric toys, power banks, etc. due to their high output voltage, high energy density, long cycle life, long shelf life and no memory effect. However, due to the high energy density of lithium-ion batteries and many combustible components, the risk of fire is relatively high. In recent years, fires caused by lithium-ion batteries have occurred frequently. Many airplanes, such as Emirates Airlines Boeing 777, UPS Airlines Boeing 747 freighter, Japan Airlines Boeing 787 passenger aircraft, etc., had accidents caused by lithium-ion battery fire and even crashed. News such as mobile phone charging fire, mobile phone battery explosion, power bank fire and smoke, etc. are often seen in the newspapers. According to statistics, more than 10 million laptop batteries have been recalled globally for similar reasons. The main cause of lithium-ion battery ...

Causes of fire in lithium-ion batteries The nature of the ignition of lithium-ion batteries is that the heat in the battery fails to be released according to the design intent, causing internal and external combustion materials to ignite after ignition. The main reasons for the fire are external short circuit, external high temperature and internal short circuit. 1). Internal short circuit: due to the abuse of the battery, such as the branch crystal caused by overcharge and overdischarge, the impurity dust in the battery production process, etc., it will deteriorate to pierce the diaphragm, cause a micro short circuit, and the release of electric energy will cause the temperature to rise. The chemical reaction of the material brought about by the increase expands the short-circuit path and forms a larger short-circuit current. This mutually accumulating and mutually reinforcing destruction leads to thermal runaway. 2). External short circuit: Take electric vehicles as...

If the remaining capacity/initial capacity=80% is used as the end point of the test, the current 1C cycle life of the lithium iron phosphate battery laboratory is more than 3500 times, and some reach 5000 times, while the 1C cycle life of the ternary lithium ion battery laboratory is 2500 times about. In terms of the true cycle life, the lithium iron phosphate battery pack has a much longer true cycle life than the ternary lithium ion battery. Under the same number of cycles, the remaining capacity of the lithium iron phosphate battery is much more than that of the ternary lithium ion battery. According to laboratory data, the remaining capacity of the ternary lithium ion battery after 3900 cycles is 66%, and the remaining capacity of the lithium iron phosphate battery after 5000 cycles is 84%. The battery cycle life of the lithium iron phosphate material is higher than that of the ternary material lithium ion battery. Lithium iron phosphate batteries have obvious adv...

The consistency of lithium-ion battery packs should be judged by using special tools to measure capacity, internal resistance, and charge and discharge curves. To measure the capacity internal resistance and discharge platform of a single battery, it also depends on the process level of lithium battery assembly and the battery performance requirements of specific products. The consistency of a lithium battery pack refers to the sameness of important characteristic parameters of a group of lithium batteries. The consistency of a battery refers to the consistency of battery weight and voltage. There are multiple strings of cells in the same battery pack. Each parameter is best. All are in a smaller range, which is good for consistency. The higher the consistency of the capacity, internal resistance, and charge-discharge curve of batteries produced with the same material and the same process, the better. Whether batteries can be assembled into battery packs on a large sca...

Different types of batteries have different internal resistances. The same type of battery has different internal resistance due to the inconsistency of internal chemical characteristics. The internal resistance of the battery is very small, we generally use the unit of milliohm to mean it. Internal resistance is an important technical indicator to measure battery performance. Under normal circumstances, a battery with a small internal resistance has a strong high-current discharge capacity, and a battery with a large internal resistance has a weak discharge capacity. In terms of the schematic diagram of the discharge circuit, we can consider the battery and the internal resistance separately, and divide it into a power supply with no internal resistance at all and connect it with a small resistance in series. At this time, if the external load is light, then the voltage distributed to this small resistor is small. On the contrary, if the external load is very heavy, then...