Battery Module Cell Pressure Range for Swelling and Performance
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Solution Overview
Problem
Existing methods for setting pressure on secondary battery cells in battery modules are empirical and lack a systematic approach based on quantitative data, leading to suboptimal performance and structural stability.
Innovation Solution
A method to determine an optimal pressure range for secondary battery cells by analyzing performance data such as capacity degradation rate and internal resistance increase rate, and ensuring structural stability by setting minimum and maximum pressures for both cell stack support and module housing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If secondary battery cells are pressed with increasing pressure to prevent swelling, then swelling phenomenon is reduced, but cell performance deteriorates when pressure exceeds optimal range
Solution Approach 1:
The patent applies parameter changes by systematically varying the pressing pressure parameter to identify the optimal range. Through controlled experiments with different pressure levels, the patent determines that pressures between 1-5 MPa prevent swelling while maintaining cell performance, whereas pressures above 5 MPa cause performance deterioration. This quantitative parameter optimization resolves the contradiction between swelling prevention and performance maintenance.
2Ease of manufacture
If empirical pressure setting is used for cell assembly, then manufacturing process is simple, but performance optimization and structural stability cannot be ensured
Solution Approach 1:
The patent implements feedback by establishing a systematic pressure setting methodology that uses cell performance data and swelling measurements to determine optimal pressure ranges. The patent creates a feedback loop where pressure effects are measured, analyzed, and used to refine pressure settings, ensuring both performance optimization and structural stability while maintaining manufacturing simplicity through standardized pressure ranges of 1-5 MPa.
Data Source
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AI summary
A method of setting a cell pressure range according to the present disclosure includes: based on performance data of a secondary battery cell, determining, as Pcell_min, a minimum pressure for realizing performance of the secondary battery cell, and determining, as Pcell_max, a maximum pressure for realizing performance of the secondary battery cell; and a second operation of determining, as Pmodule_min, a minimum pressure at which a cell stack may be supported and fixed, and determining, as Pmodule_max, a maximum pressure at which the cell stack may be pressed without damage to a module housing in end of life (EOL) of secondary battery cells , wherein an intersection range of the Pcell_min to the Pcell_max and the Pmodule_min to the Pmodule_max is set as the cell pressure range.