Secondary Battery Activation for Electrolyte Permeation at High Voltage
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Solution Overview
Problem
Conventional secondary battery activation methods fail to sufficiently permeate electrolyte solution into the electrode, leading to insufficient capacity and potential thickness increase, especially at high voltages.
Innovation Solution
A method involving pre-aging, initial-charging, room temperature aging, full-charging to 4.4V or more, degassing, and controlled CC and CV charging processes to secure electrolyte solution and minimize electrode thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional charge/discharge repetition is performed, then battery activation is attempted, but electrolyte solution is not sufficiently permeated into the electrode
Solution Approach 1:
The patent applies parameter changes by modifying the charging voltage to 4.4V or higher, which creates sufficient electrostatic pressure to force electrolyte solution permeation into the electrode structure. This voltage threshold parameter change directly addresses the insufficient permeation issue while maintaining capacity requirements.
2Quantity of substance
If battery capacity is increased to operate at high voltages, then maximum capacity in limited space is achieved, but sufficient remaining amount of electrolyte solution inside electrode becomes necessary
Solution Approach 1:
The patent changes the operating voltage parameter to 4.4V or higher, which enables the battery to achieve maximum capacity in limited space while simultaneously ensuring sufficient electrolyte solution remains inside the electrode through the enhanced electrostatic pressure for permeation.
3Length of stationary object
If electrode thickness is reduced to minimize battery size, then space efficiency improves, but sufficient electrolyte solution penetration becomes more difficult
Solution Approach 1:
By increasing the charging voltage to 4.4V or higher, the patent generates sufficient electrostatic pressure to overcome the reduced diffusion path length in thinner electrodes, ensuring adequate electrolyte solution penetration and remaining amount even when electrode thickness is minimized for space efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Increases the remaining amount of electrolyte solution inside the electrode, ensuring high capacity and preventing excessive electrode thickness, thereby enhancing battery performance.
Implementation Method 1
the electrolyte solution was not sufficiently permeated into the inside of the electrode
Implementation Method 2
electrolyte solution permeation into the electrode
Implementation Method 3
a degassing step of removing gas inside the secondary battery
Data Source
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AI summary
A method of activating a secondary battery according to the present invention includes: a pre-aging step of aging a secondary battery, where an electrode assembly and an electrolyte solution are accommodated in a battery case, at a room temperature; an formation step of initial-charging the pre-aged secondary battery; a room temperature aging step of aging the initial-charged secondary battery at a room temperature; a step of full-charging the room-temperature-aged secondary battery to a voltage of 4.4V or more; and a degassing step of removing gas inside the secondary battery. According to the present invention, it is possible to increase the remaining amount of an electrolyte solution inside an electrode by full-charging a secondary battery.