How to calculate the amount of battery electrolyte

Lithium batteries are composed of auxiliary materials such as positive and negative pole pieces, diaphragm, electrolyte, and shell tabs. The battery pole piece coating can be regarded as a kind of composite material, which is mainly composed of three parts: (1) living material particles; (2) a mixed phase of conductive agent and binder; (3) pores, which must be filled with electrolyte. The diaphragm is also porous. On the one hand, it isolates electrons. On the other hand, the pores must be filled with electrolyte to allow lithium ions to pass through. Therefore, the electrolyte volume of a lithium battery is important to fill the pores in the pole pieces and diaphragms. The pore volume is the volume of electrolyte consumption, namely: electrolyte volume u003d positive electrode pore volume + negative electrode pore volume + diaphragm pore volume; and The calculation method of the pore volume of the pole piece and the diaphragm is: the pore volume of the pole piece u003d (length × width × thickness of each pole piece coating) × number of sheets × porosity pore volume of the diaphragm u003d area of u200bu200bthe diaphragm × thickness × porosity Taking into account that in addition to the battery core, the space inside the shell has remaining space that has not been filled (the space can also be calculated based on the battery design), these places will also have residual electrolyte, that is: actual electrolyte volume u003d all pores Volume + residual electrolyte volume Hard-shell batteries have a large residual volume, and the actual electrolyte consumption is much larger than the theoretical value. The remaining space inside the soft-pack battery is average, the residual electrolyte volume is moderate, the internal space utilization of the cylindrical battery is high, and the residual electrolyte volume less. The thickness and porosity of the diaphragm will be supplied by the material manufacturer. For example, the thickness is 25 microns and the porosity is 49%. According to the cell design or straight disassembly of the battery, the length and width of the diaphragm can be measured to calculate the area of u200bu200bthe diaphragm, so that the amount of electrolyte required by the diaphragm can be calculated. For the parameters of the pole piece, the length, width and thickness of the coating (except for the foil) can be measured according to the actual pole piece. The method of calculating the porosity of the pole piece is: pore division ratiou003d1- (coating compaction density divided by coating uniform density), where the uniform density of the coating and the compaction density of the coating are respectively: Statement: Article published on this site Part of the pictures and content are from the Internet. If there is any infringement, please contact to delete the previous post: Discussion on traditional lithium battery charging methods