Secondary Battery Pre-Charging With Cyclic Pressure Control
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Solution Overview
Problem
Existing manufacturing methods for secondary batteries lack efficient processes for preliminary charging and pressure management, which can lead to uneven charging, gas buildup, and reduced battery performance.
Innovation Solution
A manufacturing method that includes preliminary charging of the electrode body, multiple cycles of pressurizing and pressure reducing during and after charging, to efficiently form a solid electrolyte interphase and remove gases, thereby enhancing charging uniformity and battery stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If preliminary charging is performed without pressure management, then charging process is simplified, but charging uniformity deteriorates and gas buildup occurs
Solution Approach 1:
The patent applies periodic pressure cycles during preliminary charging, where the battery is subjected to repeated pressurization and depressurization cycles. This periodic action enhances charging uniformity by preventing gas buildup and improving electrolyte distribution, while managing the complexity through automated control sequences.
Solution Approach 2:
The patent changes pressure parameters during the preliminary charging process, transitioning from atmospheric pressure to elevated pressure and back. This parameter variation improves charging uniformity and facilitates gas removal, addressing the technical contradiction by making pressure management an integral part of the charging process rather than a separate complication.
2Object-generated harmful factors
If pressure is applied continuously during charging, then gas removal is improved, but adhesion of battery components deteriorates
Solution Approach 1:
The patent employs periodic pressure application with alternating pressurization and depressurization phases. During pressurization, gas is forced out of the battery; during depressurization, the battery components maintain adhesion. This periodic action effectively removes gas buildup while preserving component adhesion, resolving the contradiction between gas removal and adhesion maintenance.
Solution Approach 2:
The patent applies preliminary pressurization before full charging to prevent excessive gas generation, and uses controlled depressurization intervals to release accumulated gas before it can cause adhesion problems. This anticipatory gas management prevents the harmful effects of gas buildup while maintaining component integrity.
3Productivity
If multiple pressurization cycles are performed, then gas removal efficiency is improved, but production time increases
Solution Approach 1:
The patent implements optimized periodic pressure cycles with controlled duration and frequency. By carefully tuning the number of cycles, pressure levels, and timing, the process achieves effective gas removal while minimizing total production time. The periodic action is structured to be as efficient as possible, balancing gas removal needs with production throughput requirements.
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
This method ensures uniform charging and efficient gas removal, leading to improved battery performance, reduced defects, and lower production costs by enhancing the adhesion of battery components and maintaining a stable environment during charging.
Implementation Method 1
a preliminary charging of preliminarily charging at least one electrode body including a positive electrode material, a negative electrode material, and an electrolyte
Implementation Method 2
one or more times of pressurizing of bringing the electrode body into a pressurized state by a mechanical pressure
Implementation Method 3
one or more times of pressure reducing of reducing a pressure in an atmosphere of the electrode body
Data Source
AI summary
A manufacturing method of a secondary battery, including: a preliminary charging of preliminarily charging at least one electrode body including a positive electrode material, a negative electrode material, and an electrolyte; one or more times of pressurizing of bringing the electrode body into a pressurized state by a mechanical pressure during a period of the preliminary charging and a period after the preliminary charging; and one or more times of pressure reducing of reducing a pressure in an atmosphere of the electrode body during a period of the preliminary charging and a period after the preliminary charging.