Sodium Battery Module Stack Pressure and Cooling Layout
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Solution Overview
Problem
Existing sodium secondary battery modules face challenges in securing stability through automatic electrical connection and integrated surface pressure, while also requiring effective temperature management for unit stacks.
Innovation Solution
The module design includes laminated unit stacks with solid electrolytes and electrodes, orthogonally arranged separators with ventilation holes and slits, a case with surface pressure adjustment, and a blowing fan for temperature management, along with a wiring structure for automatic electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If unit stacks are stacked vertically to connect in series, then electrical output is improved, but structural stability and mechanical bonding become more difficult to maintain
Solution Approach 1:
The patent combines the surface pressure structure with the case into an integrated design, where the case itself applies surface pressure to the unit stacks through its configuration and fastening mechanisms, eliminating the need for separate pressure application structures and ensuring both structural stability and electrical connection
2Manufacturing precision
If separators with ventilation holes and slits are used, then air permeability for cooling is improved, but thermal insulation capability deteriorates
Solution Approach 1:
The patent applies local quality by providing thermal insulation at specific locations (between unit stacks and at ends) while maintaining ventilation holes and slits in the separators at other locations, allowing the system to have both thermal insulation capability and air permeability for cooling in different areas where needed
3Strength
If surface pressure is applied to unit stacks, then mechanical bonding and electrical contact are improved, but complexity of pressure adjustment increases
Solution Approach 1:
The patent implements self-service by designing the case with an integrated surface pressure structure that automatically applies and maintains pressure to the unit stacks through its configuration and fastening mechanisms, eliminating the need for complex external pressure adjustment systems while ensuring stable mechanical bonding and electrical contact
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 ensures stability, automatic electrical connection, and effective temperature management, preventing thermal shock and facilitating efficient air permeability for cooling, thus enhancing the reliability and performance of the sodium secondary battery module.
Implementation Method 1
a blowing fan mounted in a through-hole formed on one surface of the lower case to cause forced convection inside the lower case
Implementation Method 2
The separator may include a line heater on a surface, facing the unit stack
Data Source
AI summary
A sodium secondary battery module, according to an exemplary embodiment of the present invention, may comprise: unit stacks in which a plurality of unit cells are laminated, the plurality of unit cells each having an upper cap and a lower cap which seal up a plate-shaped solid electrolyte and a positive electrode component and a negative electrode component which are plate-shaped and respectively disposed on two sides of the solid electrolyte; separators which are interposed between the unit stacks while the plurality of unit stacks are arranged in columns and rows, so as to separate spaces between the unit stacks; and a case for accommodating the plurality of unit stacks and the separators.