Battery Cell Holding Fixture With Expansion Circuit for Forming Gas
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Solution Overview
Problem
The existing methods for producing lithium battery cells require the forming process to be carried out outside controlled-atmosphere environments, leading to trapped gases and increased production costs due to the need for temporary sealing and subsequent degassing.
Innovation Solution
A device and method for safely holding and moving lithium battery cells during production, allowing the forming process to be performed outside dry rooms without temporary sealing, using an expansion circuit to manage gases created during the forming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the forming process is carried out outside controlled-atmosphere environments, then production costs are reduced and productivity is improved, but gases are trapped inside the cells and the process becomes unsafe
Solution Approach 1:
The patent introduces an expansion circuit as an intermediary system between the cell inner volume and the external environment. This circuit includes expansion chambers that can safely accommodate gas expansion during forming without requiring controlled-atmosphere environments. The circuit acts as a mediator that manages gas pressure and volume changes, enabling safe forming operations outside dry rooms while maintaining process reliability.
Solution Approach 2:
The invention segments the gas management function by separating the cell inner volume from the external environment through an intermediate expansion circuit. The circuit divides gas management into distinct functional zones: the cell inner volume where forming occurs, the expansion chambers that accommodate gas expansion, and the external environment. This segmentation allows each zone to operate under optimal conditions without requiring the entire system to be in a controlled atmosphere.
2Reliability
If temporary sealing is performed to prevent gas escape during forming, then safety is improved, but device complexity and production costs increase
Solution Approach 1:
The expansion circuit serves as a permanent intermediary structure that eliminates the need for temporary sealing operations. Instead of sealing cells before forming and then opening them afterward, the circuit provides a continuous, controlled pathway for gas management throughout the forming process. This reduces device complexity by replacing complex temporary sealing mechanisms with a simpler, integrated expansion circuit design.
Solution Approach 2:
The invention performs preliminary action by pre-configuring the expansion circuit to handle gas expansion before forming begins. The circuit is prepared in advance with expansion chambers positioned to accommodate expected gas volumes, eliminating the need for reactive sealing operations during the forming process. This preliminary preparation simplifies the overall process and reduces operational complexity.
3Reliability
If excessive empty space is provided within cells to accommodate gas expansion, then safety is improved, but manufacturing precision and product density are reduced
Solution Approach 1:
The invention resolves the space contradiction by moving the gas expansion function to another dimension - from within the cell inner volume to an external expansion circuit. The expansion chambers are positioned outside the cell structure, allowing cells to be designed with precise, compact dimensions optimized for manufacturing and energy density. The external circuit provides the necessary volume for gas accommodation without compromising cell design precision.
Solution Approach 2:
The expansion circuit acts as an intermediary that decouples the cell design from gas expansion requirements. By placing the expansion function in an external circuit rather than within the cell structure, the invention allows cell dimensions to be precisely optimized for manufacturing and performance while the external circuit handles gas volume changes. This separation enables both safety during forming and high manufacturing precision.
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 solution enables safe and efficient forming of lithium battery cells without the need for temporary sealing, reduces production costs, and allows for compact cell design by eliminating the need for excessive empty space within the cell.
Implementation Method 1
an expansion circuit (25) configured to receive, in use, any gaseous substances emitted from the access ports (4) of the cells (2)
Data Source
AI summary
A device for holding and moving lithium battery cells, in particular during a forming step, including a supporting base with a plurality of bays for the cells, a holding member which can be bound to the supporting base above the bays and an expansion circuit configured to receive, in use, gaseous substances emitted from access ports of the cells when the holding member is in the working configuration. The expansion circuit includes a connecting inlet at each bay, configured to couple gas-tight to the access port of the cell located in the bay. The expansion circuit also includes one or more expansion chambers and each connecting inlet is fluidly connected with at least one of the expansion chambers.