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Aging method of cylindrical lithium ion batteries

A lithium-ion battery, cylindrical technology, applied in non-aqueous electrolyte battery, electrolyte battery manufacturing, sustainable manufacturing/processing, etc., can solve the problems such as difficult selection of battery cells and insignificant voltage drop of battery cells

Inactive Publication Date: 2011-04-27
BALEAF XIAMEN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this aging method to age the batteries, the voltage drop of the batteries is not obvious, and it is not easy to select low-voltage batteries, which is not conducive to controlling the potential certain dangerous batteries to flow into the market.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] 1. Preparation of battery

[0016] (1) Preparation of positive electrode

[0017] 143 kg of positive active ingredient LiFePO 4 , 6.4 kilograms of conductive agent SP, 9.55 kilograms of binder polyvinylidene fluoride PVDF, and 262 kilograms of N-methylpyrrolidone were mixed, and then stirred in a vacuum mixer to form a uniform positive electrode slurry.

[0018] The slurry was evenly coated on 18um aluminum foil, then dried at 120°C, rolled, and cut into strips to obtain a positive electrode with a size of 1540×55mm×0.167mm, which contained 26.4 grams of active ingredient LiFePO4.

[0019] (2) Preparation of negative electrode

[0020] Mix 53.2 kg of active ingredient natural graphite, 1.48 kg of acetylene black, 1.77 kg of conductive agent SP, 2.65 kg of binder polyvinylidene fluoride PVDF, 64.5 kg of N-methylpyrrolidone, and 0.04 g of additive oxalic acid, and then mix them in a vacuum mixer Stir in medium to form a uniform negative electrode slurry.

[0021] The ...

Embodiment 1

[0027] At the beginning of aging, the voltage of the initial cell is 3.60V, the aging temperature is 50°C, and the aging time is 4 days.

[0028] Take any of the above methods to make 300 unformed cylindrical steel-shell lithium-ion batteries, pre-charge the batteries to 3.60V, then place the batteries in a high-temperature room, set the ambient temperature to 50°C, and age for 4 days There are 9 batteries for detecting low voltage, and the low voltage rate is 3.0%.

Embodiment 2

[0030] At the beginning of aging, the voltage of the initial cell is 3.70V, the aging temperature is 40°C, and the aging time is 3 days.

[0031] Take any of the above methods to make 300 unformed cylindrical steel-shell lithium-ion batteries, pre-charge the batteries to 3.70V, then place the batteries in a high-temperature room, set the ambient temperature to 40°C, and age for 3 days There are 9 batteries for detecting low voltage, and the low voltage rate is 3.0%.

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Abstract

The invention relates to an aging method of cylindrical lithium ion batteries, which comprises the following steps: charging a battery cell to increase the voltage to that of an initial battery cell; and placing the battery cell in an environment with the preset aging temperature. By adopting the high temperature aging method, the regenerative process of forming a solid electrolyte interface (SEI) is promoted more effectively to form a more even and stable SEI film, and a battery cell the interior microcircuit of which has low voltage can be better picked out. Compared with the existing methods, the aging time is shorter, the temperature is higher, and compared with the normal battery cells, the voltage of the battery cell with interior micro short circuit is more obvious, so that the battery cell with low voltage can be picked out more easily, thereby shortening the period, saving the energy source and increasing the economic benefits.

Description

technical field [0001] The invention relates to an aging method for batteries, more specifically, the invention relates to an aging method for cylindrical lithium ion batteries. technical background [0002] With the development of technology and economy, the functions of electronic products in the market are becoming more and more powerful, and the shape and size requirements are getting smaller and smaller, and the weight requirements are getting lighter and lighter. Due to the advantages of high specific capacity, high working voltage, no environmental pollution, long cycle life, and wide operating temperature range, lithium-ion batteries are widely used in mobile phones, notebook computers, digital cameras and other electronic products, and even some lithium-ion batteries Batteries are already used in cars. [0003] Lithium-ion batteries use lithium cobalt oxide, lithium nickel oxide, nickel-cobalt-manganese ternary materials, lithium manganese oxide, lithium ferrous ph...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 庄志光
Owner BALEAF XIAMEN NEW ENERGY TECH
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