How to correctly choose power lithium-ion battery products?

How to correctly choose power lithium-ion battery products. Lithium-ion batteries are called ultimate energy and green energy. Since their appearance in the 1990s, they have been widely used in people’s production and life, from button batteries for electronic products to lithium-ion batteries for mobile phones. And DC digital products, to the battery of electric vehicles. Compared with other batteries, lithium-ion batteries have great advantages in volume, weight and performance. It is not right to use lithium-ion batteries in a reasonable voltage range to pursue ultra-large capacity and ultra-high voltage. First of all, everything has to go through a process from simple to complex, from difficult to easy, just like the same combustible gas, it is easier to effectively ensure the safety of the lighter, but it is more difficult to effectively ensure the safety of the car's fuel tank, so far During the period, the situation of automobile fire and explosion accidents has not yet been completely resolved. The more energy accumulated in a limited volume, the more difficult it is to manage. At present, Suzhou Sunstar can only guarantee the safety of battery combinations below 48V10Ah. Secondly, the higher the voltage and the larger the capacity, the greater the difficulty and failure rate of the protection circuit and the balance circuit. Therefore, Suzhou Xingheng does not advocate or support battery combinations above 48V10Ah. View lithium-ion battery safety testing certification i.UL certification At present, most countries and regions in the world require products involving safety, health, environmental protection and other items to obtain safety certification before entering the market. The UL mark has become one of the world's famous safety certification marks. The testing standards are as follows: 1. The outer casing of the lithium-ion battery casing should be strong and hard enough to withstand excessive pressure without causing a fire. The user-replaceable lithium-ion battery should be strong enough not to hurt people. 2. The battery that can be replaced by the electrolyte user shall not contain pressurized vapor or toxic vapor and liquid that may harm the eyes, or the leakage of the battery shell under normal laboratory conditions (temperature: 23°C) shall not exceed 5ml. 3. When using lithium-ion batteries, measures to prevent abnormal charging current should be used. The battery under test should have an acceptable charging current Ic. Under abnormal conditions, the terminal product should take protective measures. 4. The maximum mass loss of a discharged battery or battery shall not exceed 1g0.5%, 1~5g0.2%u003e5g0.1%. 5. Mechanical test (1) Squeeze: A pressure of 13KN (17.2Mpa) is applied to the two planes of the battery through a hydraulic piston with a diameter of 32mm, and the pressure is released when the maximum pressure is reached. The sample will not catch fire or explode. (2) Impact: Place a rod with a diameter of 15.8mm in the center of the sample, and drop a weight of 9.1kg from a height of 610mm onto the sample. The sample will not catch fire or explode. (3) Acceleration: Place the battery on a fixed fixture and accelerate in three mutually perpendicular directions (acceleration requirements: the minimum average acceleration in the initial 3ms is 75g, and the peak acceleration is 125-175g). The test temperature is 20±5°C. The sample shall not catch fire, explode, or leak. (4) Vibration: Simple tuning vibration of the battery (along three mutually perpendicular directions). The vibration frequency changes at a frequency of 1Hz/min within the range of 10-55hz, and recovers within 90-100min, with an amplitude of 0.8mm. The sample must not catch fire, explode or leak. (5) Thermal shock: The sample is heated in a natural convection or forced convection furnace. The temperature of the oven is increased to 150°C, the heating rate is 5±2°C/min, and the temperature is stopped after 10 minutes. The sample must not catch fire or explode. (6) Thermal cycle test: The battery is placed in the test room, and the cycle is as follows: the temperature is raised to 70±3°C within 30 minutes, and the temperature is kept for 4 hours. After 30 minutes, cool down to 20±3°C and keep it warm for 2h. Raise the temperature to 40±3℃ within 30min and keep it for 4h. Cool down to 20±3℃ within 30min. Repeat this cycle 9 times. After 10 cycles, the battery was left for 7 days. The sample must not catch fire, explode or leak. (7) High altitude simulation: The sample battery is stored for 6 hours at an absolute pressure of 11.6Kpa (1.68psi) and 20±3°C (68±5F). The sample battery should not explode or catch fire, nor should it perforate or leak. 6. Charge and discharge test (1) Charge and discharge cycle: The test temperature is 25℃, and the battery should be charged and discharged according to the manufacturer's requirements. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Analysis of the impact of water on lithium-ion batteries