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Method for testing optimal compaction density of lithium ion battery lithium iron phosphate positive plates

A technology of lithium iron phosphate and lithium ion batteries, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of not discussing the impact of compaction density on battery performance, and achieve the effect of excellent performance

Active Publication Date: 2016-12-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

However, there are no related patents on the impact of compaction density on battery performance in the published patents

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  • Method for testing optimal compaction density of lithium ion battery lithium iron phosphate positive plates
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  • Method for testing optimal compaction density of lithium ion battery lithium iron phosphate positive plates

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The test object of the present invention is the lithium iron phosphate positive electrode sheet of the lithium ion battery.

[0020] Such as figure 1 As shown, the present invention tests the method for optimal compaction density of lithium iron phosphate positive plate of lithium ion battery, comprises the following steps:

[0021] 1. Prepare the pole piece: take the unrolled lithium iron phosphate positive pole piece, put it in an oven and bake at 80°C for 12 hours, punch the pole piece with a diameter of 12mm, weigh and measure the thickness one by one and group them, and select the quality A group of pole pieces with an error of 1 mg and a thickness error of 1 μm is used as the experimental object, and then the scale of the double-precision wide-roll rolling machine is adjusted for rolling, and the thickness is measured, g...

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Abstract

The invention discloses a method for testing the optimal compaction density of lithium ion battery lithium iron phosphate positive plates. The method includes the following steps that positive plates are put into an oven to be baked for 12 h at 80 DEG C, then stamped, subjected to weighing, thickness measuring and rolling one by one and then put into the oven to be baked for 3 h at 80 DEG C; button batteries are made; forming is carried out, wherein two cycles of charging and discharging are carried out with 0.1 C current and 0.5 C current; charging is carried out, wherein charging is carried out to a semi-charged state with 0.1 C current; testing is carried out, wherein alternating-current impedance testing and linear scanning testing are carried out in sequence; data processing is carried out, wherein the gram volume is calculated, the exchange current density and the solid-phase diffusion coefficient of Li+ are calculated, and impedance fitting is carried out to obtain the internal resistance value; the result is analyzed, and when the gram volume, the exchange current density and the solid-phase diffusion coefficient of Li+ are the maximum and the internal resistance is the minimum, the battery performance is the optimal. By synthesizing the parameters, the compaction density of the positive plates corresponding to the batteries with the optimal performance is selected as the optimal compaction density of the positive plates.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery production technology, in particular to a method for testing the optimal compaction density of lithium iron phosphate cathode sheets of lithium-ion batteries. Background technique [0002] Lithium-ion batteries are green batteries with a series of excellent properties and have been widely used. Due to the advantages of high safety, high environmental protection, high specific energy, low price, and long life, lithium iron phosphate material has become the first choice material for lithium-ion power batteries, and lithium-ion batteries with lithium iron phosphate as the positive electrode material are now Has been widely used in electric tools, electric bicycles, mopeds, golf carts, airplane model toys, miner's lamps and other power battery fields. With the widespread application of lithium-ion secondary batteries using lithium iron phosphate as the cathode material, competition among companies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3865
Inventor 吴风霞荆孟娜王世旭
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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