How to calculate the amount of electrolyte for industrial lithium batteries?

Industrial lithium batteries are composed of auxiliary materials such as positive and negative pole pieces, barriers, electrolyte, and shell tabs. The cell coating can be regarded as a composite material, which is mainly composed of three parts: (1) active material particles; (2) a mixed phase of conductive agent and binder; (3) pores, which must be filled with electrolyte. The barrier is also porous. On the one hand, it isolates electrons, and on the other hand, the pores must be filled with electrolyte to allow lithium ions to pass through. Therefore, the electrolyte volume of industrial lithium batteries is primarily to fill the pores in the overflowing pole pieces and barriers, and the pore volume is the volume of electrolyte consumption. Electrolyte volume u003d positive electrode sheet pore volume + negative electrode sheet pore volume + barrier pore volume and the calculation method of the pore volume of the pole piece and the barrier is: the pore volume of the pole piece u003d (length × width × thickness of each pole piece coating) × The number of pieces × the volume of the pores of the porosity barrier u003d the area of u200bu200bthe barrier × the thickness × the porosity, taking into account whether the space inside the shell has been filled in addition to the battery cells (these spaces can also be calculated according to the battery plan) ), there will also be residual electrolyte in these places, that is: practical electrolyte volume u003d all pore volume + residual electrolyte volume. Hard-shell industrial lithium batteries have more residual volume, and the practical electrolyte consumption is much larger than the theoretical value. Soft pack batteries The remaining space inside is average, the amount of remaining electrolyte is appropriate, the utilization rate of the internal space of the cylindrical battery is high, and the amount of remaining electrolyte is small. The thickness and porosity of the barrier will be supplied by the material manufacturer. For example, the thickness is 25 microns and the porosity is 49%. According to the cell planning or straight dismantling of the battery, the length and width of the barrier can be measured, and the barrier area is calculated, so that the amount of electrolyte required for the barrier can be calculated. The parameters of the pole piece can measure the length, width and thickness of the coating (except the foil) according to the practice of the pole piece. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Analysis of the working principle of lithium batteries