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Lithium iron phosphate lithium-ion battery with electricity exhaustion early-warning function

A lithium-ion battery, lithium iron phosphate technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve problems such as poor reliability, high development cost, complex electronic circuits, etc., to achieve low cost, accurate early warning of battery exhaustion, Simple production process

Inactive Publication Date: 2015-12-16
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a lithium iron phosphate lithium ion battery with an early warning function of battery exhaustion in view of the problems of complex electronic circuits, high development costs, and poor reliability in the existing lithium iron phosphate battery remaining power estimation system. Ion battery, the battery uses a simpler and more reliable electronic circuit to measure the characteristic warning platform voltage, accurately provides a warning of power exhaustion, and can still have a certain capacity for emergency use after the warning

Method used

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  • Lithium iron phosphate lithium-ion battery with electricity exhaustion early-warning function

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Embodiment 1

[0022] This embodiment describes a lithium iron phosphate lithium-ion battery with an early warning function of power exhaustion, the positive electrode active material is mainly lithium iron phosphate, the gram specific capacity of lithium iron phosphate is 160mAh / g, and the initial efficiency is 98%; Lithium vanadate is used as an auxiliary positive active material with an early warning function. The amount of lithium vanadate added accounts for 15% of the positive active material, and lithium vanadate and positive active material are physically mixed; natural graphite negative material is used, and the specific capacity is 360mAh / g, the first efficiency is 95%.

[0023] Among them, the production of the positive electrode sheet is to first make a solution of the binder and the solvent methyl pyrrolidone, add a conductive agent, and after dispersion, add the active material lithium iron phosphate and the auxiliary positive electrode material lithium vanadate to mix into a sl...

Embodiment 2

[0031] This embodiment describes a lithium iron phosphate lithium-ion battery with an early warning function of power exhaustion, the positive electrode active material is mainly lithium iron phosphate, the gram specific capacity of lithium iron phosphate is 160mAh / g, and the initial efficiency is 98%; Lithium vanadate is used as an auxiliary positive active material with an early warning function. The amount of lithium vanadate added accounts for 30% of the positive active material, and lithium vanadate and positive active material are physically mixed; natural graphite negative material is used, and the gram specific capacity is 360mAh / g, the first efficiency is 95%.

[0032] Among them, the production of the positive electrode sheet is to first make a solution of the binder and the solvent methyl pyrrolidone, add a conductive agent, and after dispersion, add the active material lithium iron phosphate and the auxiliary positive electrode material lithium vanadate to mix into...

Embodiment 3

[0040]This embodiment describes a lithium iron phosphate lithium-ion battery with an early warning function of power exhaustion, the positive electrode active material is mainly lithium iron phosphate, the gram specific capacity of lithium iron phosphate is 160mAh / g, and the initial efficiency is 98%; Lithium vanadate is used as an auxiliary positive active material with early warning function. The amount of lithium vanadate added accounts for 45% of the positive active material, and lithium vanadate and positive active material are physically mixed; natural graphite negative material is used, and the specific capacity is 360mAh / g, the first efficiency is 95%.

[0041] Among them, the production of the positive electrode sheet is to first make a solution of the binder and the solvent methyl pyrrolidone, add a conductive agent, and after dispersion, add the active material lithium iron phosphate and the auxiliary positive electrode material lithium vanadate to mix into a slurry...

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Abstract

The invention discloses a lithium iron phosphate lithium-ion battery with an electricity exhaustion early-warning function. The lithium iron phosphate lithium-ion battery comprises a positive pole material, a negative pole material, a conductive agent, a binding agent, a positive pole plate, a negative pole plate, a diaphragm, an electrolyte and a shell. The positive pole material is prepared from, by weight, 50-80% of lithium iron phosphate serving as a main positive pole active substance and 15-45% of lithium vanadate serving as an auxiliary positive pole active substance with an early-warning function. Compared with an existing lithium iron phosphate lithium-ion battery, a voltage platform for electricity exhaustion early-warning is additionally arranged and is lower than a discharging platform of the existing lithium iron phosphate lithium-ion battery, when discharging voltage reaches the early-warning platform, characteristic early-warning platform voltage can be measured through a simpler and more reliable electronic circuit without software support, the electricity exhaustion early-warning function is provided accurately, and certain capacity is still left over after early-warning for emergency use.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium iron phosphate lithium ion battery with an early warning function of power exhaustion. Background technique [0002] In recent years, with the vigorous development of the electric vehicle (EV) industry, lithium iron phosphate lithium-ion batteries have become the mainstream as power batteries. Therefore, the demand for lithium iron phosphate lithium-ion batteries has grown rapidly. Strict requirements, the capacity of electric vehicles comes from the battery pack, the battery pack is composed of multiple single cells connected in series and parallel, it requires the single cells to have good consistency, small size, high energy density, light weight, and long cycle life , high security and environmental friendliness. On the other hand, electric vehicles have continuously improved the estimation accuracy of the remaining power of the lithium iron phosphate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/36H01M4/58H01M4/485
CPCH01M4/364H01M4/485H01M4/5825H01M10/0525H01M2004/028H01M2220/20Y02E60/10
Inventor 吴强王龙超李庆余王红强黄有国胡坤赖飞燕张晓辉
Owner GUANGXI NORMAL UNIV