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A method for quickly detecting the self-discharge rate of lithium iron phosphate lithium ion battery

A lithium-ion battery and lithium iron phosphate technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effects of reducing production costs, improving production efficiency and product quality

Inactive Publication Date: 2016-08-03
SHENZHEN HAIYING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fast and accurate measurement

Method used

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  • A method for quickly detecting the self-discharge rate of lithium iron phosphate lithium ion battery
  • A method for quickly detecting the self-discharge rate of lithium iron phosphate lithium ion battery
  • A method for quickly detecting the self-discharge rate of lithium iron phosphate lithium ion battery

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Embodiment 1

[0022] The method for quickly detecting the self-discharge rate of the lithium iron phosphate lithium ion battery includes the steps of preparing the lithium iron phosphate lithium ion battery to be fully charged, and its initial state is just fully charged, so that the battery has a greater polarization , the subsequent voltage change will show a sharp drop, approaching the equilibrium potential of the battery; the fully charged lithium iron phosphate lithium ion battery needs to be kept from overcharging, and the cut-off voltage range of charging is 3.5-4.0V; then Leave the battery on hold for 18-48 hours, preferably 24 hours; prepare a voltmeter, and use the voltmeter to measure the voltage U across the positive and negative terminals of the lithium iron phosphate lithium-ion battery after shelving 1 .

[0023] For a fully charged battery, the self-discharge rate of the battery is judged based on the voltage values ​​at both ends of the battery’s positive and negative termi...

Embodiment 2

[0030] A method for quickly detecting the self-discharge rate of a lithium iron phosphate lithium-ion battery, the steps of which are: take the lithium iron phosphate lithium-ion battery and make it fully discharged, and its initial state is just discharged, so that the battery has a greater polarization , the subsequent voltage change will show a sharp rise, approaching the equilibrium potential of the battery; the discharged lithium iron phosphate lithium-ion battery needs to be kept undischarged, and the cut-off voltage range is 2.0-2.5V; the battery Leave it on hold for 2-12 hours, preferably 4 hours, and use a voltmeter to measure the voltage U across the positive and negative terminals of the battery 2 .

[0031] For a fully discharged battery, the self-discharge rate of the battery is judged according to the voltage values ​​at both ends of the battery’s positive and negative terminals. relationship, as shown in Table 2:

[0032] Table 2: The relationship between the ...

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PUM

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Abstract

The invention relates to the field of a lithium-ion battery, and discloses a method for quickly detecting self discharge rate of a lithium iron phosphate lithium-ion battery. Aiming at the problem that as the open-circuit voltage of current lithium iron phosphate lithium-ion battery is irrelevant to charge state of the battery, the self-discharged degree of the battery cannot be judged in the using process of the battery, the invention provides the method for quickly detecting self discharge rate of the lithium iron phosphate lithium-ion battery. The method respectively measures voltage values of the battery fully charged and fully discharged after a period so as to judge the self-charge rate of the battery, and the method is rapid and accurate to measure, and beneficial for greatly improving the production efficiency and product quality and screening the consistency of lithium ion single battery. Meanwhile, complex devices and steps are avoided, so that the production cost is effectively reduced.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for detecting the self-discharge rate of iron phosphate lithium ion batteries. Background technique [0002] Lithium iron phosphate is a positive electrode material for lithium-ion batteries used in power batteries. Due to the characteristics of lithium iron phosphate, the discharge platform of lithium-ion batteries made solely of lithium iron phosphate as the positive electrode material is very flat. Generally, lithium iron phosphate The static voltage of the battery after charging is almost always at 3.33V, and the value of the static voltage is basically independent of the degree of charging, and its voltage value is closely related to its crystal structure, while the lithium iron phosphate material always maintains the Olivine structure, the olivine structure only changes very slightly with the charging and discharging process of the material. Therefore, when the lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
Inventor 唐道平陶芝勇曾纪术郭永兴曾坚义
Owner SHENZHEN HAIYING TECH