Porosity measuring method, device, equipment and system

Abstract

The invention discloses a porosity measuring method, device, equipment and system. The porosity measuring method comprises the following steps: acquiring dry weight and volume of a to-be-measured object; obtaining the buoyancy weight of the to-be-measured object in the solid density meter after the to-be-measured object is fully infiltrated; obtaining the to-be-measured object by completely immersing the to-be-measured object in the infiltration type solution under a vacuumizing condition after the to-be-measured object is fully infiltrated, wherein the liquid in the solid density meter is the infiltration type solution, and the to-be-measured object is the same as the to-be-measured object in volume after the to-be-measured object is fully infiltrated; and determining the porosity of the to-be-measured object according to the dry weight, the buoyancy weight, the volume and the density of the infiltrating type solution at normal temperature. The to-be-measured object is completely immersed in the infiltration type solution and vacuumized, it can be guaranteed that the to-be-measured object is fully infiltrated, the speed of infiltrating the to-be-measured object can be increased, the fully infiltrated to-be-measured object is placed in the solid density meter to obtain the buoyancy weight, and the volume of the fully infiltrated to-be-measured object is the same as that of the to-be-measured object. The infiltrating type solution does not influence the volume of the object to be measured, so that the porosity measurement precision is ensured.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a porosity measurement method, device, equipment and system. Background technique [0002] Porosity refers to the percentage of the pore volume in the bulk material to the total volume of the material in the natural state, reflecting the compactness of the bulk material. The porosity of the battery pole piece is one of the very important parameters in the battery design process, which has an important impact on the transport performance of the electrolyte. [0003] At present, the measurement methods of the porosity of the battery pole piece include the following: the first method is to use a mercury porosimeter to measure the test method, which is expensive, difficult to operate and seriously polluted; the second method is to immerse the pole piece in the solution and take it out Weigh and calculate the porosity of the pole piece according to the mass ch...

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Problems solved by technology

[0003] At present, the measurement methods of the porosity of the battery pole piece include the following: the first method is to use a mercury porosimeter to measure the test method, which is expensive, difficult to operate and seriously polluted; the second method is to immerse the pole piece in the solution and take it out Weigh and calculate the porosity of the pole piece according to the mass change, but because the pole piece needs to be wiped with the infiltration solution after it is taken out of the solution, it will absorb the solution in the pole piece, making the mass change inaccurate, thus making the porosity measurement result inaccurate ; The third is to use a spring balance to weigh the dry weight of the pole piece and the weight after immersion in the solution to calculate. Among them, the pole piece is immersed in the solution to soak the pole piece in the solution for a period of time. Liquids can affect the weighing results, causing errors in porosity measurements

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