Prismatic Battery Cell Pressurization for Injection Port Sealing
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Solution Overview
Problem
Existing secondary battery manufacturing processes face challenges in effectively pressurizing and sealing the electrolyte injection port of prismatic type secondary batteries, which can lead to gas discharge and leakage during the formation process.
Innovation Solution
A battery cell pressurizing device and method that includes a battery cell arranging part, pressurizing part, and electrolyte injection port sealing part, utilizing pressurizing balls and a sealing member to securely pressurize the battery cell and seal the electrolyte injection port, ensuring a vacuum state within the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery cell is pressurized using conventional methods, then the gas discharge problem is addressed, but the sealing of the electrolyte injection port becomes difficult and unreliable
Solution Approach 1:
The battery cell is pressurized to a predetermined internal pressure before the electrolyte injection port sealing operation. This preliminary pressurization creates an outward force on the sealing member that counteracts internal gas pressure, ensuring reliable sealing. The pressurization is performed in advance using a pressurizing device that applies force to opposite surfaces of the battery cell, establishing the necessary pressure condition before sealing begins.
Solution Approach 2:
A sealing member is introduced as an intermediary element between the electrolyte injection port and the external environment. This sealing member is inserted into the electrolyte injection port after pressurization, and it is held in place by the pressure differential created during the preliminary pressurization step. The sealing member acts as a mediator that enables reliable sealing without requiring complex welding or mechanical fastening systems.
2Device complexity
If the electrolyte injection port is sealed before pressurization, then the sealing process is simpler, but gas discharge and leakage occur during the formation process
Solution Approach 1:
The battery cell is pressurized to a predetermined internal pressure before the electrolyte injection port sealing operation. This preliminary pressurization creates an outward force on the sealing member that counteracts internal gas pressure, ensuring reliable sealing. The pressurization is performed in advance using a pressurizing device that applies force to opposite surfaces of the battery cell, establishing the necessary pressure condition before sealing begins.
Solution Approach 2:
The internal pressure is increased in advance to create a counteracting force that prevents gas discharge. By establishing this pressure condition before sealing, the system creates a force balance that opposes any potential gas leakage, thereby preventing harmful gas discharge during the formation process while maintaining sealing integrity.
3Manufacturing precision
If multiple pressurizing points are used to evenly pressurize the battery cell, then the pressurization effectiveness is improved, but the device complexity increases
Solution Approach 1:
The pressurizing structure is divided into multiple independent pressurizing units, each capable of applying force to a specific region of the battery cell. These pressurizing units are distributed across opposite surfaces of the battery cell, allowing each unit to independently pressurize its local area. This segmentation enables uniform overall pressurization while keeping each individual pressurizing unit relatively simple in structure.
Solution Approach 2:
Each pressurizing unit is designed to apply force locally to a specific region of the battery cell, creating localized pressurization zones. By distributing multiple such local pressurizing actions across the battery cell surfaces, the system achieves uniform overall pressurization. Each local unit maintains simple structure while the collective arrangement provides the desired uniformity and effectiveness.
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
The solution effectively pressurizes the battery cell between electrode tabs and seals the electrolyte injection port, preventing gas discharge and maintaining a vacuum state, thereby enhancing the manufacturing process efficiency and integrity of prismatic type secondary batteries.
Implementation Method 1
a pressurizing part arranged to pressurize a first surface of the battery cell and a second surface of the battery cell opposite to the first surface
Implementation Method 2
an electrolyte injection port sealing part for sealing an electrolyte injection port of the battery cell with a sealing member while the battery cell is pressurized
Data Source
AI summary
A battery cell pressurizing device includes a battery cell arranger configured to arrange a battery cell, a battery cell pressurizer above the battery cell arranger, the battery cell pressurizer being configured to pressurize the battery cell, and an electrolyte injection port sealer above the battery cell pressurizer, the electrolyte injection port sealer being configured to seal an electrolyte injection port of the battery cell while the battery cell is pressurized by the battery cell pressurizer.