Comprehensive analysis of the skills of buying batteries

A comprehensive analysis of the purchased batteries to master the basic knowledge of batteries is conducive to our daily use. Today, lithium-ion battery manufacturers explain how to buy and accept batteries: the choice and specifications of the battery make the battery system more reliable. First, the battery must be selected correctly. UPS and communication batteries are different in design: some batteries have good Cycle characteristics; some batteries are suitable for starting; some batteries are suitable for low temperature environment; some batteries are suitable for small current discharge, etc. In the process of choosing a battery, it is necessary to understand the difference between the battery and the use process, fully understand the battery's electrical performance and user requirements for product performance. The user's demand for the product. Such as backup power system capacity requirements, use frequency, use environment, one-time use, service life, reliability requirements, instantaneous discharge rate, rectification specifications and other battery-related performance requirements. Commitment to the supplier’s product. Product design parameters (battery model, appearance size, rated power, rated voltage specific energy, volume, weight, weight, design life, the number of positive and negative plates, the thickness ratio of the positive and negative plates, the density of the electrolyte, the plate Types, grid materials, etc.), product performance parameters, actual products used, installation and use environment, performance and price of different models, different types of product guarantees, etc. According to the discharge capacity in the completely power-off state, select the appropriate battery model: Ccu003dKkCs/KcKk-capacity reserve factor, set to 1.25. Kc-capacity conversion coefficient, corresponding to the end-of-discharge voltage of 1.8v, check the relationship curve between battery discharge capacity and discharge time in the design manual. Cc-Long-term full discharge capacity. The battery specification is described in IEEEstd.485, so the user can easily select the battery specification after determining the cycle life of the system. In the process of selecting a suitable battery, the following factors should be considered: Kt-temperature correction coefficient so that the battery can work normally under the lowest temperature environment expected. Kd-design margin factor allows the battery to compensate for the additional load. The aging factor enables the battery to meet its service life. The user must follow the correct procedures for the acceptance and storage of the battery to ensure the quality of installation and use. The following are the three most important steps: (1) Damage inspection: Check the battery immediately after delivery, so that the user can quickly grasp the damage or missing parts. If the problem is reported too late, not only will new losses be added, but it will also be difficult for the manufacturer or supplier to make a claim. (2) After the above check is completed, the installation can be carried out. After the installation is complete, charge it up, and then suspend it for 72 hours after fully charged, and then complete the capacity test. If the capacity test is passed, the battery acceptance is complete. (3) After acceptance, the battery must be fully charged again. After charging for 72 hours, the internal resistance of the battery was measured as the base value to judge its performance. If the internal resistance value is ±5% of the average value, it is considered that the internal resistance value matches. If the battery value exceeds 5% of the average value, it is best to let the supplier replace it, because if the internal resistance changes too much, it will affect the battery life. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete it.