Battery Module Sealing Protective Member for Pouch Cells
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Solution Overview
Problem
Pouch-type battery cells face sealing issues due to increased internal pressure, leading to electrolyte leakage and reduced energy density, as the wide sealing portions required for pressure resistance compromise the size of the electrode and capacity of the battery module.
Innovation Solution
A battery module design incorporating a sealing protective member that contacts the sealing portions of adjacent pouch-type battery cells, reducing the width of the sealing portions while maintaining pressure resistance and preventing deformation, thereby stabilizing the sealing and increasing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of sealing portions is increased to withstand internal pressure, then sealing reliability is improved, but the size of electrode and capacity of battery module are reduced
Solution Approach 1:
A sealing protective member is introduced as an intermediary component between adjacent battery cells. This protective member bears the mechanical load of internal pressure, allowing the sealing portions to maintain reliable sealing without requiring excessive width. The sealing protective member acts as a mediator that transfers and distributes the pressure load, resolving the contradiction between sealing reliability and electrode size.
Solution Approach 2:
The pressure resistance function is segmented from the sealing portion and assigned to a separate sealing protective member. This segmentation allows the sealing portion to focus on its primary sealing function with minimized width, while the sealing protective member handles the pressure resistance function. This division resolves the contradiction by separating the two competing requirements into different components.
2Quantity of substance
If the width of sealing portions is reduced to increase electrode size, then energy density is improved, but sealing reliability under pressure deteriorates
Solution Approach 1:
The sealing protective member serves as a mediator that compensates for the reduced sealing portion width. By introducing this protective structure, the system can achieve high energy density through minimized sealing portions while maintaining sealing reliability through the protective member's pressure resistance capability.
Solution Approach 2:
Different parts of the battery cell structure are assigned different functional qualities: the sealing portions are minimized in width for energy density, while the sealing protective members are designed with sufficient structural quality to provide pressure resistance. This local differentiation of quality allows simultaneous optimization of both energy density and sealing reliability.
3Stability of the object's composition
If the sealing portions are made wide to prevent deformation, then sealing stability is improved, but the internal space utilization of module housing is reduced
Solution Approach 1:
The sealing protective member acts as an intermediary that provides deformation prevention function externally, allowing the sealing portions to be minimized. This protects the sealing stability while maximizing the internal space available for electrode assemblies within the module housing.
Solution Approach 2:
The pressure resistance and deformation prevention functions are moved from the two-dimensional sealing portion width to a three-dimensional sealing protective member structure. This dimensional transition allows compact sealing portions that maximize internal space utilization while maintaining sealing stability through the protective member's structural design.
Data Source
AI summary
A battery module includes a cell stack formed by stacking a plurality of pouch-type battery cells, each of the plurality of pouch-type battery cells including an electrode accommodation portion accommodating an electrode assembly therein, a sealing portion sealing at least a portion of a periphery of the electrode accommodation portion, and electrode leads electrically connected to the electrode assembly, a module housing accommodating the cell stack therein, a bus bar assembly having at least one conductive bus bar electrically connected to the electrode leads, and at least one sealing protective member disposed between sealing portions of adjacent battery cells. The sealing protective member is disposed to be in contact with the sealing portions.