Battery Manufactory

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

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

At present, major lithium battery manufacturers have designed various types of lithium battery protection chips for different types of lithium-ion battery overcharge, overdischarge, and overcurrent protection requirements to ensure battery safety performance and avoid deterioration of battery characteristics. Most of these lithium battery protection chips are suitable for lithium-ion batteries with 1-4 cells in series, and very few new products, such as Texas Instruments' BQ77PL900 chip, are suitable for lithium-ion batteries with 5-10 cells in series, and their protection functions Perfect and widely used in many lithium battery protection circuits. However, for many serial numbers, such as battery packs with more than 10 strings of lithium batteries in series or the number of protection chips are different from the actual number of lithium battery packs in series, if the current integrated circuit chips on the market are used to make the protection circuit, there w

Low-temperature lithium-ion batteries are classified according to their discharge performance: energy storage low-temperature lithium-ion batteries, rate-type low-temperature lithium-ion batteries. Low-temperature energy storage lithium-ion batteries are widely used in military tablet computers, paratroopers, military navigators, unmanned aerial vehicle backup starting power supplies, special flight instrument power supplies, satellite signal receiving devices, marine data monitoring equipment, atmospheric data monitoring equipment, outdoor Video recognition equipment, oil exploration and detection equipment, monitoring equipment along railway lines, outdoor monitoring equipment for power grids, military warm shoes, on-board backup power supplies. Low-temperature rate-type lithium-ion batteries are used in infrared laser equipment, strong light-type police equipment, and acoustic police equipment. Low-temperature lithium-ion batteries are classified according to appli