Bare-Cell Module Case Structure for Higher Energy Density
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Solution Overview
Problem
Existing energy storage devices face challenges in increasing energy density due to the volume occupied by cell cases, which act as dead space.
Innovation Solution
The energy storage device eliminates the need for cell cases by directly supporting bare cells within a module case, utilizing a module case with accommodation spaces and a cover that includes outer and inner wall members to enhance coupling strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell cases are used to accommodate bare cells, then the structural stability and protection of bare cells are improved, but the energy density decreases due to the dead space occupied by cell cases
Solution Approach 1:
The patent removes the cell case component entirely, extracting the protective and supportive functions from the traditional cell case structure. The bare cells are directly accommodated in the module case with support ribs providing necessary structural support, eliminating the dead space that would have been occupied by separate cell cases while maintaining the required structural stability through integrated support features.
2Quantity of substance
If the number of bare cells is increased to improve energy density, then the energy storage capacity increases, but the structural complexity and assembly difficulty increase
Solution Approach 1:
The patent merges the functions of the cell case and module case by directly accommodating bare cells in the module case. The support ribs are integrated into the module case structure, combining multiple functions (protection, support, and organization) into a single integrated structure. This reduces the overall number of components and simplifies the assembly process while allowing for increased numbers of bare cells to be accommodated efficiently.
3Quantity of substance
If cell cases are eliminated to increase energy density, then the volume for bare cells increases, but the pressure resistance and anti-explosion performance may deteriorate
Solution Approach 1:
The patent applies local quality by providing targeted structural support through support ribs positioned at specific locations within the module case. Rather than using a complete cell case structure, the support ribs are strategically placed to provide local reinforcement where needed for pressure resistance and anti-explosion performance, while leaving other areas open to maximize the volume available for bare cells.
Data Source
AI summary
The present disclosure relates to an energy storage device including a module case in which a plurality of accommodation spaces are formed, a plurality of bare cells, an cover, and a coupling part coupling the module case to the cover, wherein the module case is in direct contact with the bare cells, the cover includes a cover main body coupled to the module case to cover the accommodation spaces, an outer wall member protruding from a cover facing surface of the cover main body, which faces the module case, in a first direction toward the module case, and an inner wall member protruding from the cover facing surface in the first direction and spaced apart from the outer wall member, and the coupling part includes a first coupling member disposed between the outer wall member and the inner wall member to couple the module case to the cover.