A method for measuring the distribution of electrolyte in a lithium-ion battery core

A technique for lithium-ion batteries and measurement methods, which is applied in the field of measurement of electrolyte distribution in lithium-ion battery cores, and can solve problems such as lithium analysis in batteries, affecting battery safety and service life, etc.

Active Publication Date: 2019-04-23
JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the electrolyte in some parts of the pole piece is seriously lacking, it may even cause the battery to decompose lithium, which seriously affects the safety and service life of the battery.

Method used

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  • A method for measuring the distribution of electrolyte in a lithium-ion battery core
  • A method for measuring the distribution of electrolyte in a lithium-ion battery core
  • A method for measuring the distribution of electrolyte in a lithium-ion battery core

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The measurement of electrolyte distribution on the negative pole sheet in embodiment 1 lithium-ion battery core

[0047] 1. Prepare two groups (experimental group and control group) of V0D5N0 non-injected electrolyte batteries (length 220mm, width 135mm, thickness 29mm, steel case), wherein the electronic insulating film uses polyethylene film with surface ceramic treatment ; The positive electrode active material is LiFePO 4 ; The active material of the negative electrode is graphite; the electrolyte formula containing tracer elements is a chain carbonate, and the lithium salt is 1M LiPF 6 .

[0048] 2. According to the normal battery processing procedure, inject 300g of electrolyte solution containing 1mol / L lithium hexafluorophosphate salt, and the trace element is lithium element in lithium hexafluorophosphate salt. Among them, the experimental group made the battery before charging according to the normal battery processing procedure, and the control group direct...

Embodiment 2

[0061] Determination of electrolyte distribution on the negative pole sheet in embodiment 2 lithium-ion battery core

[0062] 1. Prepare two groups (experimental group and control group) of V0D5N0 non-injected electrolyte batteries (220mm in length, 135mm in width, 29mm in thickness, aluminum shell), in which the electronic insulating film uses a polyethylene film with surface ceramic treatment ; The positive electrode active material is LiFePO 4 ; The active material of the negative pole piece is hard carbon; the electrolyte formula containing tracer elements is a chain carbonate, and the lithium salt is 1M LiPF 6 .

[0063] 2. Inject 300g of electrolyte solution containing 1mol / L lithium hexafluorophosphate salt according to the normal battery processing procedure, and the trace element is iron. Among them, the experimental group made the battery before charging according to the normal battery processing procedure, and the control group directly charged to the full state. ...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a method for measuring electrolyte distribution in a lithium ion battery core. The method specifically comprises the following steps of injecting electrolyte containing a tracer element into a to-be-measured lithium ion battery, measuring the content of the tracer element in a to-be-measured part of the lithium ion battery core by utilization of an ion tracing method, calculating actual electrolyte distribution quantity of each region of the to-be-measured part, and obtaining an electrolyte distribution difference value by means of calculating a difference between the actual electrolyte distribution quantity and theoretical electrolyte absorption quantity. The method disclosed by the invention has the advantages that the effects of simplicity and easiness in implementation are achieved; the distribution quantity condition of the electrolyte on a battery anode film sheet, a battery cathode film sheet and an electronic insulating film can be respectively tracked and characterized, so that not only can the injecting quantity of the electrolyte of the battery with different sizes or different materials be predicted, and the condition that sufficient electrolyte is injected into the battery can be guaranteed, but also the distribution tracking on the absorption of the electrolyte of all parts of the battery anode sheet and the battery anode sheet can be performed.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for measuring electrolyte distribution in lithium ion battery cores. Background technique [0002] Since the commercialization of lithium-ion batteries, they have been widely used in the field of electronic products due to their advantages such as high energy density, high voltage, low self-discharge rate, and light weight. In recent years, in order to meet the needs of electric vehicles and energy storage, the capacity and volume of single lithium-ion batteries have been continuously increased, so that the amount of electrolyte in the battery has increased from a few grams or tens of grams to hundreds of grams. Affected by many factors such as the placement method in the battery case, the winding method of the battery core, the width and tightness of the winding, and the battery processing process, so much electrolyte is not evenly distributed in the batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/73
CPCG01N21/73
Inventor 刘凯陈玲吕欢欢邓兆轩冯铸
Owner JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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