Bipolar Battery Module Electrolyte Injection Opening Layout
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Solution Overview
Problem
The liquid injectability of an electrolytic solution into the internal space of a cell in conventional bipolar battery modules is compromised due to the thinning of the positive and negative electrode layers, which reduces the height of the liquid injection opening and the internal space.
Innovation Solution
A bipolar battery module design that includes a sealing member covering the peripheral edge of the positive-negative electrode foil, with a liquid injection opening that extends to the adjacent cell side, allowing for improved injectability by increasing the opening size and maintaining the internal space volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the positive electrode layer and negative electrode layer is reduced to increase energy density, then the energy density is improved, but the height of the liquid injection opening is reduced and liquid injectability deteriorates
Solution Approach 1:
The liquid injection opening is extended in the lateral direction (along the peripheral edge of the electrode foil) rather than relying solely on the thickness direction. This dimensional shift allows the opening to compensate for the reduced height caused by thinner electrode layers, maintaining adequate liquid injectability while preserving high energy density.
Solution Approach 2:
The peripheral edge of the electrode foil is configured to be deflectable or movable, allowing the liquid injection opening to dynamically adapt its shape and size. This flexibility enables the opening to maintain sufficient dimensions for liquid injection even when the overall cell thickness is reduced.
2Volume of moving object
If the thickness of the electrode layers is reduced, then the total thickness of the cell is reduced, but the volume of the internal space is reduced and liquid injectability deteriorates
Solution Approach 1:
The liquid injection opening extends along the peripheral edge of the electrode foil in the lateral dimension, compensating for the reduced thickness dimension. This allows adequate liquid access to the internal space even when the overall cell volume is reduced due to thinner electrode layers.
3Ease of operation
If the liquid injection opening is extended to the adjacent cell side, then the liquid injectability is improved, but the device complexity increases
Solution Approach 1:
The extended peripheral edge structure serves multiple functions: it forms the liquid injection opening, provides sealing surfaces, and defines cell boundaries. This multi-functionality achieves improved liquid injectability without proportionally increasing structural complexity.
Solution Approach 2:
The liquid injection opening structure is merged with the peripheral edge of the electrode foil and the sealing member. By combining these elements into an integrated structure, the patent achieves extended opening functionality without adding separate complex components.
Data Source
AI summary
The bipolar battery module of the present disclosure has a structure in which a plurality of cells is stacked in a laminating direction of the bipolar electrodes. Each of the plurality of cells includes an internal space in which an electrolytic solution is accommodated between two positive-negative electrode foil adjacent to each other in the laminating direction. In a part of the outer peripheral part of each cell, a liquid injection opening for injecting an electrolytic solution into the internal space is formed by the sealing member. The liquid injection opening in at least a part of the cells has a shape widened to the adjacent cell side by disposing the peripheral edge part of at least one of the positive-negative electrode foil of the two positive-negative electrode foil so as to be offset to the adjacent cell side.