Method and equipment for measuring weight of lithium battery electrolyte by using solution dilution
A solution dilution and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of inaccurate measurement and difficulty in measuring the remaining electrolyte and lithium salt residue of batteries with unknown liquid injection volume
Pending Publication Date: 2022-08-05
苏州时代华景新能源有限公司
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Problems solved by technology
In this method, powder will fall off the pole piece during the battery dissection process, and lithium salt will still remain after the electrolyte solvent is dried, and water absorption may occur when the pole piece is weighed after drying, the operation time is long, and there are many uncontrollable factors, resulting in The accuracy of this method is low and can only be used as a rough reference
[0007] The above two measurement methods are difficult to measure the remaining electrolyte of batteries with unknown liquid injection volume, or cannot be measured accurately, so a method for accurately measuring the remaining electrolyte of batteries with unknown liquid injection volume is needed
Method used
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[0035] The following combined with the attachment is further explained to the present invention.
[0036] Such as figure 1 Show, a method of using solution to dilute the weight of lithium battery electrolyte, including:
[0037] Step 1: Preparation of standard solutions, its concentration is C, the mass is M standard, the volume is V, and the density is a tadpole. The standard solution stabilizes each group of lithium ion batteries. Existing in the battery to be measured, the solvent and electrolyte solution occur in each other;
[0038] The standard solution of the standard solution is NATFSI (double (dilate (triaxyl sulfamin) sodium) amine sodium) with 1mol / L, the ion ion is a sodium ion, and the ion that is detected during concentration measurement. Any type of carbonate, ethyl carbonate, and ethyl carbonate.
[0039] Step 2: Insecting the battery shell in a dry environment to expose the battery electrolyte; under the dew point at -30 degrees, the battery shell is anatomy to le...
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The invention discloses a method for measuring the weight of a lithium battery electrolyte by using solution dilution, which comprises the following steps of: preparing a standard solution which is stable for each component of a lithium ion battery, does not generate chemical reaction between the two components, does not exist in a battery to be measured, and is mutually soluble with an electrolyte solution; the method comprises the following steps: sampling a mixed solution in a battery at regular intervals, measuring the concentration of calibration ions in the mixed solution, and calculating the mass of the electrolyte in a battery pack according to the concentration of the diluted calibration ions in a standard solution when the solute concentration between the electrolyte and the standard solution is balanced. The weight of the electrolyte in the original battery can be accurately calculated according to the relative change of the concentration of the diluted solute in the standard solution of the components.
Description
Technical field [0001] The present invention belongs to the field of lithium -ion battery, which specializes in a method and equipment that uses solution to dilute the weight of lithium battery electrolyte. Background technique [0002] With the continuous growth of market demand, the application of lithium -ion batteries in the field of 3C and power storage categories is becoming more and more widespread. In recent years, with the launch of the timetable for fuel vehicles in various countries, the status of new energy vehicles has become more stable, and lithium -ion batteries, as the core power source of electric vehicles, have also been sought after by the market. During the production process, the lithium -ion battery involves the selection and matching of positive poles, electrolytes, negative electrodes, and diaphragms, and the selection of pole design parameters; the battery work involves chemical reactions, mass transmission, conductivity, heat production and other proces...
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Login to View More IPC IPC(8): G01G17/04G01N1/28G01N1/30G01N21/73
CPCG01G17/04G01N1/28G01N1/30G01N21/73Y02P70/50
Inventor 王奇志
Owner 苏州时代华景新能源有限公司