Power Storage Module Sealing Structure for Accurate Electrolyte Porting
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Solution Overview
Problem
The existing manufacturing process for bipolar batteries is complex and prone to decreased sealing performance if the liquid injection port for electrolytic solution deviates from its designed position.
Innovation Solution
A power storage module design that includes a sealing body with first and second sealing portions, where the first sealing portion is joined to the edge of each electrode and has a protruding part, and the second sealing portion covers the outer periphery of the first sealing portion. The sealing body has a welded layer where the protruding parts of adjacent first sealing portions are welded, and an opening wall with a communication hole and a non-opening wall without a hole, with the width of the welded layer varying accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid injection port is formed in the sealing body after the sealing body is formed, then the sealing performance may be improved, but the manufacturing process complexity increases
Solution Approach 1:
A plate is inserted into the first sealing portion before the second sealing portion is formed, preliminarily defining the position where the liquid injection port will be formed. This preliminary action ensures that the port is formed at the correct design position without requiring post-processing adjustments, thus maintaining sealing performance while avoiding increased manufacturing complexity.
Solution Approach 2:
The plate acts as an intermediary tool that temporarily occupies the space where the liquid injection port will be formed. By using this intermediary object during the formation process, the patent achieves precise positioning of the port without requiring complex manufacturing processes or post-formation modifications to the sealing body.
2Ease of manufacture
If the liquid injection port formation position deviates from the design, then the manufacturing process may be simplified, but the sealing performance declines
Solution Approach 1:
The plate is inserted beforehand to preliminarily define the exact position where the liquid injection port will be formed. This preliminary positioning action ensures that when the second sealing portion is formed, the port automatically appears at the correct design position, eliminating positioning deviation while keeping the manufacturing process simple.
Solution Approach 2:
The patent replaces complex mechanical positioning systems with a simple plate insertion method. Instead of using sophisticated fixtures or alignment mechanisms, a straightforward plate insertion preliminarily defines the port position, achieving both manufacturing simplicity and positioning accuracy.
3Reliability
If the width of the welded layer at the opening wall is increased, then the sealing performance is improved, but burrs form and adhere to the plate
Solution Approach 1:
The width of the welded layer is made different at different locations: at the opening wall where the plate is inserted, the welded layer width is controlled to be smaller to prevent burr formation that would adhere to the plate. At other locations without the plate, the welded layer width can be larger to ensure sealing performance. This local differentiation of welded layer quality resolves the contradiction between sealing performance and burr prevention.
4Object-generated harmful factors
If the width of the welded layer at the non-opening wall is decreased, then burr formation is reduced, but the sealing performance is compromised
Solution Approach 1:
The welded layer width is optimized locally: at non-opening walls where no plate is present, the welded layer width is sufficient to ensure sealing performance without causing burr formation issues. At opening walls where the plate is inserted, the welded layer width is deliberately reduced to prevent burrs from forming and adhering to the plate. This local quality differentiation allows each region to have the appropriate welded layer width for its specific function.
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 design ensures sufficient sealing performance without increasing manufacturing complexity, by accurately positioning the communication hole and maintaining the integrity of the welded layer, thus preventing burrs and simplifying the process.
Implementation Method 1
the sealing body has a welded layer where the protruding parts of the first sealing portions adjacent to each other in the first direction are welded to each other
Data Source
AI summary
In a power storage module, a side surface of an electrode laminate body has a welded layer where first sealing portions adjacent in a lamination direction are welded. A sealing body has: a side surface (opening wall) provided with a through hole communicating with an internal space; and side surfaces (non-opening walls) lacking the through hole. When viewed from the lamination direction, a width of the welded layer at the opening wall is smaller than a width of the welded layer at the non-opening wall.