Battery Module Housing Using Vacuum Constraint Assembly
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Solution Overview
Problem
Constraining a plurality of stacked power storage modules is time-consuming and labor-intensive, necessitating a more efficient method for assembly.
Innovation Solution
A power storage device with a housing that constrains a module stacked body by utilizing an air pressure difference within a sealed space, featuring deformable components and an intermediate member that expands due to pressure differences, allowing easy assembly and reduced mechanical stress on electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a plurality of stacked power storage modules is constrained by a predetermined pressing force using conventional mechanical methods, then the modules are securely fixed, but it takes time and effort to constrain the modules
Solution Approach 1:
The patent applies pneumatic pressure differential to constrain the module stacked body. The housing creates a sealed space where negative pressure (vacuum) is generated, causing the atmospheric pressure outside to press the housing walls inward, thereby constraining the modules automatically without manual intervention or mechanical fastening operations.
Solution Approach 2:
The constraining mechanism operates autonomously through the pressure differential system. Once the sealed space is created and negative pressure is applied, the housing structure automatically constrains the modules through the pressure-induced deformation of its walls, eliminating the need for external mechanical constraint operations.
2Strength
If the housing walls are made rigid to maintain structural strength, then the housing can withstand pressure differences, but the housing cannot deform to constrain the module stacked body
Solution Approach 1:
The housing structure employs local quality differentiation where different portions have different stiffness characteristics. The bottom wall and lid are designed with controlled deformability to allow constraining movement, while the side walls maintain higher rigidity to preserve overall structural strength and withstand the pressure differential without collapsing.
Solution Approach 2:
The housing transitions from a static rigid structure to a dynamic adaptable structure. Under normal conditions, the housing maintains its rigid form for structural integrity. When negative pressure is applied, the bottom wall and lid dynamically deform inward to constrain the modules, demonstrating adaptability while maintaining overall structural strength.
3Device complexity
If electronic devices are arranged inside the sealed space, then wiring is simplified, but the electronic devices may be damaged by mechanical stress during constraining
Solution Approach 1:
The housing internal space is segmented into different functional zones. The module stacked body is constrained in one region through pressure-induced deformation, while electronic devices are positioned in separate regions that are not directly involved in the constraining action, protecting them from mechanical stress while maintaining wiring simplicity.
Solution Approach 2:
The housing design anticipates potential mechanical stress on electronic devices by strategically positioning them in areas less susceptible to deformation during the constraining process. This beforehand consideration protects the electronic devices from damage while still allowing them to be housed inside the sealed space for wiring simplification.
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
Facilitates easy and secure constraining of stacked power storage modules, minimizing mechanical stress on electronic components and ensuring airtightness while maintaining deformability for efficient operation.
Implementation Method 1
the housing constrains the module stacked body in the stacking direction of the electrode inside the first sealed space by deforming at least a portion of the bottom wall and the lid so as to come close to each other due to an air pressure difference between the inside and outside of the first sealed space
Implementation Method 2
the intermediate member arranged between the inner wall surface of the housing and the module stacked body is deformed so as to expand due to an air pressure difference between the first sealed space and the second sealed space. Accordingly, the intermediate member can function as a damper
Data Source
AI summary
A power storage device includes: a module stacked body including at least one power storage module including a plurality of stacked electrodes; and a housing constituting a first sealed space for accommodating the module stacked body, wherein the housing has a housing body including a cylindrical side wall extending along a stacking direction in the module stacked body and a plate-shaped bottom wall closing one end of the side wall and a lid being joined to the other end of the side wall and constrains the module stacked body in the stacking direction of the electrode inside the first sealed space by deforming at least a portion of the bottom wall and the lid so as to come close to each other due to an air pressure difference between the inside and outside of the first sealed space.