What are the effects of lithium ion batteries?home solar energy storage lithium battery

　　temperature

　　The effect of temperature on internal resistance is obvious. The lower the temperature, the slower the ion transmission inside the battery, and the greater the internal resistance of the battery. Battery impedance can be divided into body phase impedance, SEI membrane impedance, and charge metastatic impedance. Body phase impedance and SEI membrane impedance are mainly affected by electrolyte ion conductivity. The changes in low temperatures are consistent with the changes in electrolyte conductivity.

　　Compared with the increase in body impedance and SEI membrane resistance at low temperatures, the amount of charge response impedance increases with decreased temperature. Below -20 ° C, the proportion of charge response impedance accounted for almost 100%.

　　SOC

　　When the battery is in different SOCs, its internal resistance is also different, especially the DC internal resistance directly affects the power performance of the battery, which reflects the battery performance in the actual state: the lithium battery DC internal resistance is DOD with the depth of the battery discharge DOD DOD DOD Increased increases, the internal resistance size is basically unchanged when the discharge interval of 10%to 80%, and generally increases the internal resistance significantly at a deeper discharge depth.

　　storage

　　As the storage time of lithium -ion batteries increases, the battery is constantly aging, and its internal resistance continues to increase. Different types of lithium battery internal resistance varies. After the long-term storage of September to October, the internal resistance increase rate of LFP batteries is higher than the internal resistance increase rate of NCA and NCM batteries. Internal resistance increases is related to storage time, storage temperature and storage SOC.

　　cycle

　　Whether it is storage or cycle, the effect of temperature on the internal resistance of the battery is consistent. The higher the circulating temperature, the greater the internal resistance increase. The effects of different circular intervals on the battery's internal resistance are different. The internal resistance of the battery increases with the increase of the charging and discharge depth.

　　In addition to the impact of the depth of charging and discharge in the cycle, the charging interception voltage also has an impact: the upper limit of the charging voltage of too low or too high will increase the interface of the electrode. Too high voltage limit can cause electrolyte to oxidize and decompose the electrolytic fluid on the Lifepo4 electrode surface to form a product with low conductivity.

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