Bipolar Battery Module Sealing Around Electrolyte Feed Holes
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Solution Overview
Problem
Existing bipolar secondary batteries face challenges in achieving stable sealability at the seal portions, particularly at communication holes where the inside of the battery communicates with the outside, leading to potential leakage of electrolytic solutions.
Innovation Solution
The electric power storage module incorporates a first resin portion with frame-shaped sealing members and spacers between current collectors, forming internal spaces sealed by a sealing body, with communication holes allowing access to these spaces. The sealing body is joined to the resin portion, and a laminate sheet with a metal layer and insulating layers is welded to enhance stability and sealability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing body is attached to the seal portion to increase sealing performance, then sealability is improved, but the complexity of the structure increases
Solution Approach 1:
The sealing body is integrated with the first resin portion to form a unified sealing structure. The joining of the sealing body to the resin portion creates a combined component that provides both sealing function and structural support, reducing the number of separate parts while maintaining enhanced sealability at the communication holes and seal portions.
Solution Approach 2:
The sealing structure utilizes composite construction by joining the sealing body (which may be made of different material properties) to the first resin portion. This composite approach allows optimization of each component for its specific function while achieving overall improved sealing performance without requiring complete redesign of the entire structure.
2Reliability
If the inner edge of the spacer is located inside the inner edge of the sealing member, then a holding region is formed for stable sealing body attachment, but the internal space volume is reduced
Solution Approach 1:
The spacer is designed with different edge positions at different locations: in the first portion where the sealing body is attached, the inner edge is positioned inside the sealing member's inner edge to create a holding region for stable attachment. In other portions, the spacer's inner edge can be positioned at or outside the sealing member's inner edge to maximize internal space volume. This local variation in spacer positioning optimizes both attachment stability and space utilization.
Solution Approach 2:
The first resin portion is divided into multiple portions (first portion and other portions) with different spacer positioning strategies. The first portion has the spacer inner edge inside the sealing member inner edge for stable sealing body attachment, while other portions can have the spacer inner edge at or outside the sealing member inner edge to preserve internal space volume. This segmentation allows simultaneous optimization of different functional requirements in different regions.
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 configuration provides a stable sealing body that increases sealability, preventing leakage while allowing easy access for electrolytic solution feeding, thus ensuring the integrity and functionality of the battery.
Implementation Method 1
a welded end portion including the four outer side faces, the welded end portion being formed by welding outer peripheral edges of the sealing members and the spacers opposite to the internal spaces
Data Source
AI summary
An electric power storage module including: an electrode stack including a plurality of electrodes each including a current collector, the electrodes being stacked along a first direction; a first resin portion provided to the electrode stack such that an internal space is formed between each of the current collectors adjacent in the first direction, the first resin portion sealing the internal space; and a sealing body joined to the first resin portion, in which the first resin portion has an outer surface including: a first end face in the first direction; a second end face opposite the first end face in the first direction; and four outer side faces extending along the first direction such that the first end face and second end face are connected.