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Method for selecting Li (M1-xFex) PO4/Li4Ti5O12 high-capacity batteries

A high-capacity, battery technology, applied in the field of lithium-ion batteries, can solve the problem that the screening or selection method cannot be accurately and effectively screened out, and achieve the effect of high consistency and improved service life.

Active Publication Date: 2021-01-22
天津普兰能源科技有限公司
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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 that existing screening or selection methods cannot accurately and effectively screen out Li(M 1-x Fe x )PO 4 / Li 4 Ti 5 o 12 The actual internal resistance and self-discharge of the system battery

Method used

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  • Method for selecting Li (M1-xFex) PO4/Li4Ti5O12 high-capacity batteries
  • Method for selecting Li (M1-xFex) PO4/Li4Ti5O12 high-capacity batteries
  • Method for selecting Li (M1-xFex) PO4/Li4Ti5O12 high-capacity batteries

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Positive electrode uses LiMn 0.5 Fe 0.5 PO 4 Material, the homogenate formula is 90% of active material, 5% of conductive agent, 5% of binder, and the surface density of pole piece is 16mg / cm 2 , compacted density 3.0mg / cm 3 ; The negative electrode uses Li 4 Ti 5 o 12 Material, the homogenate formula is 90% of active material, 5% of conductive agent, 5% of binder, and the surface density of pole piece is 15mg / cm 2 , compacted density 1.8mg / cm 3 . The positive and negative electrodes were cut and wound to prepare 18650 type 2.5Ah cylindrical batteries, and 50 batteries were randomly selected from mass-produced batteries for test grouping.

[0045] The specific selection steps are as follows:

[0046] Step 1: Charge the formed battery with constant current 1C to 1.5V, constant voltage cut-off current 0.01C, and after standing for 30 minutes, test and record the battery open circuit voltage and internal resistance Ω1;

[0047] Step 2: Place the battery at 50°C f...

Embodiment 2

[0052] The positive electrode uses LiCo 0.5 Fe 0.5 PO 4 Material, the homogenate formula is 90% of active material, 5% of conductive agent, 5% of binder, and the surface density of pole piece is 16mg / cm 2 , compacted density 3.0mg / cm 3 ; The negative electrode uses Li 4 Ti 5 o 12 Material, the homogenate formula is 90% of active material, 5% of conductive agent, 5% of binder, and the surface density of pole piece is 15mg / cm 2 , compacted density 1.8mg / cm 3 . The positive and negative electrodes were cut and wound to prepare 18650 type 2.5Ah cylindrical batteries, and 50 batteries were randomly selected from mass-produced batteries for test grouping.

[0053] The specific selection steps are as follows:

[0054] Step 1: Charge the formed battery with constant current 1C to 1.5V, constant voltage cut-off current 0.01C, and after standing for 30 minutes, test and record the battery open circuit voltage and internal resistance Ω1;

[0055] Step 2: Place the battery at 50...

Embodiment 3

[0060] Positive electrode uses LiV 0.5 Fe 0.5 PO 4 Material, the homogenate formula is 90% of active material, 5% of conductive agent, 5% of binder, and the surface density of pole piece is 16mg / cm 2 , compacted density 3.0mg / cm 3 ; The negative electrode uses Li 4 Ti 5 o12 Material, the homogenate formula is 90% of active material, 5% of conductive agent, 5% of binder, and the surface density of pole piece is 15mg / cm 2 , compacted density 1.8mg / cm 3 . The positive and negative electrodes were cut and wound to prepare 18650 type 2.5Ah cylindrical batteries, and 50 batteries were randomly selected from mass-produced batteries for testing.

[0061] The specific selection steps are as follows:

[0062] Step 1: Charge the formed battery with constant current 1C to 1.5V, constant voltage cut-off current 0.01C, and after standing for 30 minutes, test and record the battery open circuit voltage and internal resistance Ω1;

[0063] Step 2: Place the battery at 50°C for 12 hou...

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Abstract

The invention relates to a method for selecting Li (M1-xFex) PO4 / Li4Ti5O12 high-capacity batteries. The method comprises the following steps of testing the Li (M1-xFex) PO4 / Li4Ti5O12 high-capacity batteries under at least two electric states of a high electric state, a half electric state and a low electric state, and selecting and matching battery monomers according to a test result. Because theinternal resistance and the self-discharge of the lithium battery are also continuously changed in different electrified states, according to the method, by testing and screening at least two positions of three specific rapid voltage drop areas of the Li (M1-xFex) PO4 / Li4Ti5O12 battery in a charging and discharging curve, high consistency of the internal resistance and the self-discharge trend ofthe assembled battery in each working state can be effectively ensured, and after long-time working, high consistency of the battery monomers can still be maintained, so that the service life of a module is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a Li(M 1-x Fe x )PO 4 / Li 4 Ti 5 o 12 High-capacity battery selection method. Background technique [0002] Due to high safety, long life, excellent rate performance and low temperature characteristics, lithium battery has become the preferred object of fast charge power battery, start-stop system power supply and energy storage system. In the practical application of lithium-ion batteries, the battery cells need to be connected in series and parallel to form a battery module. Usually, the series-parallel mode has extremely strict requirements on the consistency between the battery cells. The difference between the cells will seriously affect the capacity of the battery module, and in severe cases, it will cause irreversible damage to the battery cells, which will cause the battery module to be scrapped or even a safety accident. Internal resistance and self-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/344
CPCB07C5/344Y02E60/10
Inventor 崔维国费鹏扬李爱红王茂范
Owner 天津普兰能源科技有限公司