What are the factors that limit the depth of discharge of lithium batteries?

Lithium battery discharge depth Lithium battery discharge depth refers to the ratio of the discharge capacity of the lithium battery to the total stored power (nominal capacity). The smaller the number, the shallower the discharge. The depth of discharge of lithium batteries is closely related to voltage and current. It can be said that it is expressed in voltage and used in current. For example, a lithium battery has a discharge depth of 80%, which means that it is discharged to 20% of its capacity. The impact of the depth of discharge on the battery is: the deeper the depth of discharge, the easier the life of the lithium battery is to shorten; the other aspect is the performance on the discharge curve, the deeper the discharge, the more unstable the voltage and current. Under the same discharge system, the smaller the voltage value, the deeper the discharge depth. Small current discharge is more thorough, the smaller the current, the longer the working time, and the less charged electricity will reach the same voltage. In short, any topic discussing the discharge of lithium batteries must consider the discharge system, the key is the current. The first reason that limits the depth of discharge of lithium batteries is that the cycle life increases dramatically as the depth of discharge (DoD) decreases. Technically speaking, in the case of deep discharge, it is quite difficult to reduce the impact of battery charging and discharging on cycle life, which depends on many factors and exceeds the control ability of the existing technology. The second reason is that when a lithium battery supplies current to any electrical appliance, the internal resistance of the battery will increase as the capacity decreases. When the depth of discharge is large, the resistance increases and the current is constant, so the battery supply must be increased. Much electricity and wasted in the form of heat. The third reason is that the original relatively stable discharge curve of lithium batteries will change sharply when the depth of discharge is large. Therefore, limiting the depth of discharge to a relatively flat range can enable consumers to have a better control of the power. , Can also get a better experience. 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: How to assemble lithium iron phosphate batteries for electric vehicles?