Battery Module Spacer Pressing for Electrolyte Concentration Uniformity
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Solution Overview
Problem
Existing battery modules fail to effectively address concentration unevenness of electrolytic solution within electrode bodies, leading to increased internal resistance due to expansion and contraction during charging and discharging.
Innovation Solution
A battery module design with a spacer that presses battery cells in a specific manner, creating a temperature difference between the central and end portions of the electrode body to promote electrolyte solution diffusion and uniform concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a spacer with convex ribs is used to restrain battery cells, then the battery cells are restrained and positioned, but the electrolytic solution concentration unevenness cannot be eliminated
Solution Approach 1:
The pressing portion is designed with asymmetric pressing areas where the first pressing area (lower side) is larger than the second pressing area (upper side). This local quality difference creates a temperature gradient that promotes electrolytic solution circulation and eliminates concentration unevenness, while the entire pressing portion maintains the battery cell positioning function.
Solution Approach 2:
The invention changes the temperature parameter distribution within the battery cell by applying asymmetric mechanical pressure. The larger first pressing area generates more heat through compression, creating a temperature difference that drives electrolytic solution flow and resolves concentration uniformity issues.
2Adaptability or versatility
If the electrolytic solution is allowed to flow freely during expansion and contraction, then the battery can accommodate volume changes, but concentration unevenness occurs and resistance increases
Solution Approach 1:
The asymmetric pressing portion creates a temperature gradient that drives electrolytic solution circulation. This temperature-induced flow actively redistributes the electrolytic solution to eliminate concentration unevenness, thereby reducing internal resistance while allowing volume expansion.
Solution Approach 2:
The invention converts the harmful effect of electrolytic solution concentration unevenness into a beneficial circulation pattern. By creating a temperature difference through asymmetric pressing, the system generates natural convection currents that actively mix and redistribute the electrolytic solution, turning a passive concentration problem into an active mixing mechanism.
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
Reduces internal resistance by eliminating concentration unevenness of the electrolytic solution, thereby restoring optimal battery performance.
Implementation Method 1
a pressing portion configured to press the plurality of battery cells in the first direction by making contact with a predetermined pressing region of an outer surface of the rectangular battery case
Implementation Method 2
creating a temperature difference between the central and end portions of the electrode body to promote electrolyte solution diffusion and uniform concentration
Data Source
AI summary
A battery module includes: battery cells stacked in a first direction; and a spacer disposed between the plurality of battery cells adjacent to each other. Each of the battery cells includes a rectangular battery case containing an electrode body and an electrolyte solution therein, the spacer includes a pressing portion configured to press the battery cells in the first direction by making contact with a predetermined pressing region of the rectangular battery case, the pressing region is configured to overlap a central portion of the electrode body and not to overlap both end portions of the electrode body in a width direction of the battery cell, and the pressing portion has a shape in which a portion overlapping a lower side portion than the central portion of the electrode body is larger than a portion overlapping an upper side portion than the central portion of the electrode body.