How to calculate the electrolyte consumption of lithium-ion battery?

Lithium-ion batteries are composed of auxiliary materials such as positive and negative pole pieces, separators, 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 to pass through. Therefore, the electrolyte volume of a lithium-ion battery is important to fill the pores in the pole piece and the diaphragm. 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 diaphragm is: the pore volume of the pole piece u003d (length × width × thickness of each pole piece coating) × number of sheets × porosity the pore volume of the diaphragm u003d the 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 according to the battery design), these places will also have residual electrolyte, that is: actual electrolyte volume u003d all pores Volume + Residual Electrolyte Volume The hard-shell battery has 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%. The length and width of the diaphragm can be calculated according to the design of the battery cell or the direct disassembly of the battery, and the area of u200bu200bthe diaphragm can be calculated, so that the amount of electrolyte required by the diaphragm can be calculated. Electrolyte volume u003d positive electrode sheet pore volume + negative electrode sheet pore volume + diaphragm pore volume and the calculation method of the pore volume of the pole piece and diaphragm is: the pore volume of the pole piece u003d (length × width × thickness of each pole piece coating) × Number of slices × porosity diaphragm pore volume u003d diaphragm area × thickness × porosity considering that in addition to the battery core, the space inside the shell has remaining space that is not filled (these spaces can also be calculated according to the battery design) There will also be residual electrolyte in these places, that is: actual electrolyte volume u003d all pore volume + residual electrolyte volume. Hard-shell batteries have more 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 amount of residual electrolyte is appropriate, the utilization rate of the internal space of the cylindrical battery is high, and the amount of residual electrolyte is small. 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%. The length and width of the diaphragm can be calculated according to the design of the battery cell or the direct disassembly of the battery, and the area of u200bu200bthe diaphragm can be calculated, so that the amount of electrolyte required by the diaphragm can be calculated. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.