Description of the design requirements of lithium-ion power batteries

The design of the power lithium battery needs to provide the corresponding working power or power source for the equipment according to the requirements of the electrical equipment. Therefore, the design of power lithium batteries must first determine the battery voltage and the required input and output power according to the power requirements of the electrical equipment, and then optimize the process parameters and form them into a finished battery pack with certain specifications and indicators. Whether the design of the power lithium battery is reasonable or not is related to the performance of the battery, and the design must be optimized as much as possible. 1) Design requirements for power lithium batteries When designing power lithium batteries, it is necessary to understand the battery performance indicators and battery usage conditions of the electrical equipment. Generally, the following aspects should be considered: 1) battery working voltage; battery working current, that is, normal discharge Current and peak current; 2) battery working time; including continuous discharge time, service life or cycle life; 3) battery working environment; including battery working environment and ambient temperature; 4) battery maximum allowable volume, equipment reserved battery space allows battery The maximum storage volume of the finished product; because of its excellent performance, lithium-ion power lithium battery has a wider and wider range of use. Sometimes it is used in some special occasions, so there are some special requirements, such as impact resistance, vibration resistance, high and low temperature resistance, Low air pressure, etc. When considering the above-mentioned basic requirements, the source of materials, determinants of battery characteristics, battery performance, battery manufacturing technology, technical and economic analysis, and environmental temperature should also be considered. 2) How to evaluate important indicators of power lithium battery performance. Power lithium battery performance is generally evaluated through the following aspects: 1) Capacity; battery capacity refers to the amount of electricity that can be obtained from the battery under certain discharge conditions, that is, the current versus time Integral, generally expressed in Ah, it directly affects the maximum working current and working time of the battery. 2) Discharge characteristics and internal resistance; battery discharge characteristics refer to the stability of the battery's working voltage, the level of the voltage platform, and the high-current discharge performance under a certain discharge system. It indicates the ability of the battery to carry a load. The internal resistance of the battery includes ohmic internal resistance and electrochemical resistance. When the battery is discharged at a high current, the internal resistance has a particularly obvious influence on the discharge characteristics. 3) Operating temperature range; the working environment and use conditions of electrical equipment require the battery to have good performance within a specific temperature range. 4) Storage performance: After the battery is stored for a period of time, the performance will change due to the influence of certain factors, which will cause the battery to self-discharge, electrolyte leakage, and battery short circuit. 5) Cycle performance; cycle life refers to the number of cycles when the secondary battery is charged and discharged according to a certain system, and its performance decays to a certain level, which significantly affects the service life of the battery 6) safety performance; important refers to the abuse of the battery What is the safety performance of the battery under the conditions? The main abuse conditions include overcharge, short circuit, acupuncture, squeeze, hot box, heavy impact, vibration, etc. Abuse resistance is the primary condition that determines whether the battery can be used in large quantities. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: With an inverter, can the lithium-ion battery be used as a UPS power supply?