Rapid baking method for square lithium ion battery

A technology of lithium-ion batteries and baking methods, which is applied in the manufacture of secondary batteries, non-aqueous electrolyte batteries, and electrolyte batteries. It can solve the problems of affecting battery capacity and life, affecting oven utilization, and long time consumption, so as to improve production. Efficiency, shortening the baking time, and shortening the effect of the baking cycle

Active Publication Date: 2021-05-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Inventions described earlier have improved ways to improve batteries' quality after they are dried up due to high levels of humidity inside their cases or when exposed to external conditions like rainwater. These improvements include removing excessive air from the outside surface of the cells while still allowing them to absorb enough oxygen (or other gases) needed for proper functioning of the cell chemistry. Additionally, these inventors propose methods called slow-vacuum evaporation, where an alternating current voltage applied across two terminals removes any remaining liquid without affecting its properties. By doing both techniques simultaneously, the resulting product has better stability over multiple cycles of use compared to previous designs.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the speed at which lithiated carbonate (LiCoO2) cathode materials have been developed into secondary cells that use LiCo02 or similar type of layered oxide compounds. These new chemistry allows for improved specific properties like longer lifespan, higher power output, better stability during charge/recharge cycles, reduced self-heat generation rates, increased usable area without losing any significant amount of stored electrical charges due to poor solubility characteristics when mixed together.

Method used

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  • Rapid baking method for square lithium ion battery
  • Rapid baking method for square lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Preparatory stage: in the contact vacuum oven with nitrogen air inlet, gas evacuation baffle and heating device at the bottom, and nitrogen air outlet with gas collection cover in the box on the top, vacuum drying oven for placing square batteries Vacuumize to vacuum degree ≤ 50Pa, vacuumize for 3 minutes, and then fill with nitrogen to normal pressure;

[0041] (2) Preheating stage: preheat and dry the vacuum drying oven with the square battery placed, and turn on the vacuum degree control at the same time during the heating process, keep the vacuum degree between 10-100Pa, and the vacuum pump will automatically start when the vacuum degree is > 100Pa Vacuumize the program, reduce the vacuum degree to 10Pa, preheat the temperature at 80°C, and the total preheating time is 120min; the temperature rise process is combined with the opening of the vacuum degree control parameters as shown in the following table:

[0042] Table II

[0043] serial number time (

Embodiment 2

[0051] (1) Preparatory stage: in the contact vacuum oven with nitrogen air inlet, gas evacuation baffle and heating device at the bottom, and nitrogen air outlet with gas collection cover in the box on the top, vacuum drying oven for placing square batteries Vacuumize to vacuum degree ≤ 50Pa, vacuumize for 3 minutes, and then fill with nitrogen to normal pressure;

[0052] (2) Preheating stage: preheat and dry the vacuum drying oven with the square battery placed, and turn on the vacuum degree control at the same time during the heating process, keep the vacuum degree between 50-100Pa, and the vacuum pump will automatically start when the vacuum degree is > 100Pa Vacuumize the program, reduce the vacuum degree to 50Pa, preheat the temperature at 85°C, and the total preheating time is 90 minutes; the temperature rise process is combined with the opening of the vacuum degree control parameters as shown in the following table:

[0053] Table three

[0054] serial number t

Embodiment 3

[0062] (1) Preparatory stage: in the contact vacuum oven with nitrogen air inlet, gas evacuation baffle and heating device at the bottom, and nitrogen air outlet with gas collection cover in the box on the top, vacuum drying oven for placing square batteries Vacuumize to vacuum degree ≤ 50Pa, vacuumize for 3 minutes, and then fill with nitrogen to normal pressure;

[0063] (2) Preheating stage: preheat and dry the vacuum drying oven with the square battery placed, and turn on the vacuum degree control at the same time during the heating process, keep the vacuum degree between 10-100Pa, and the vacuum pump will automatically start when the vacuum degree is > 100Pa Vacuumize the program, reduce the vacuum degree to 10Pa, preheat the temperature at 95°C, and the total preheating time is 60 minutes; the temperature rise process is combined with the opening of the vacuum degree control parameters as shown in the following table:

[0064] Table four

[0065] serial number

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Abstract

The invention discloses a rapid baking method for a square lithium ion battery, which comprises the following steps of 1, in a preparation stage, vacuumizing a vacuum drying oven in which the square battery is placed to P0 for the vacuumizing time of t0, and then filling nitrogen to normal pressure, 2, in a preheating stage, preheating and drying the vacuum drying oven in which the square battery is placed, 3, in a heat and pressure maintaining stage, maintaining the vacuum degree P2 in the vacuum baking oven for the preheated battery, 4, in a circulation stage, repeating the step 3 for circulation times of X0, 5, in a nitrogen cooling circulation stage, filling nitrogen into the baking device to normal pressure, keeping the normal pressure for t3, and keeping the normal pressure for t4 under the vacuum degree P3, 6, repeating the step 5 for circulation times of X1, and 7, ending the baking. According to the method, air exchange operation is carried out in the vacuum drying oven before baking, the moisture content of gas in the oven body before baking can be removed, what is guaranteed is that the moisture content of the battery baking environment is low, and the performance of the battery is brought into play.

Description

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Claims

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Application Information

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Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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