Dual-Hardness Buffer Member for Battery Module Expansion Loads
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Solution Overview
Problem
The increasing capacity of electrical storage devices in modules leads to enhanced expansion, which increases the load on bind bars, risking their breakage and compromising the reliability of the electrical storage module.
Innovation Solution
Incorporating a buffer member with a soft part and a hard part, where the soft part is more easily deformed than the hard part, to absorb the load from the electrical storage devices and reduce the stress on the bind bars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the capacity of electrical storage device is increased, then the energy storage capability is improved, but the expansion amount increases and load on bind bars increases leading to potential breakage
Solution Approach 1:
The buffer member is designed with different hardness values at different locations: a first buffer portion with hardness 30-50 Shore A and a second buffer portion with hardness 70-90 Shore A. This local quality differentiation allows the softer first portion to absorb expansion loads while the harder second portion maintains positioning stability, resolving the contradiction between accommodating expansion and ensuring reliability.
Solution Approach 2:
The buffer member comprises regions with different material properties (different hardness values) to simultaneously achieve load absorption and positioning functions. This composite approach with varying hardness zones allows the single buffer member to handle both the expansion accommodation and reliability requirements.
2Strength
If the constraining force of bind bar is weakened, then the load applied to bind bar is reduced preventing breakage, but the positioning of electrical storage device may be loosened
Solution Approach 1:
The buffer member uses local quality differentiation with a softer first portion (30-50 Shore A) for load absorption and a harder second portion (70-90 Shore A) for positioning. This allows the bind bar to maintain strong positioning without bearing excessive expansion loads, as the buffer member's differentiated structure handles different functions at different locations.
Solution Approach 2:
The buffer member is functionally segmented into a first buffer portion for shock absorption and a second buffer portion for positioning. This segmentation allows each portion to specialize in its function, enabling the bind bar to maintain positioning stability while the buffer member absorbs expansion loads.
3Strength
If the constraining force of bind bar is weakened, then breaking of bind bar is suppressed, but reliability of electrical storage module may be lowered due to loosened positioning
Solution Approach 1:
The buffer member's differentiated hardness structure (30-50 Shore A for buffering, 70-90 Shore A for positioning) enables the bind bar to maintain strong constraining force for reliability while the buffer member's softer portion absorbs expansion loads to prevent bind bar breakage, thus resolving the contradiction.
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
The buffer member effectively absorbs the expansion load of the electrical storage devices, reducing the risk of bind bar breakage and enhancing the overall reliability of the electrical storage module.
Implementation Method 1
the soft part is more easily deformed than the hard part
Data Source
AI summary
An electrical storage module includes at least one electrical storage device, and a buffer member that is arrayed in first direction X together with the electrical storage device and receives a load in first direction X from the electrical storage device. The buffer member has a soft part and a hard part, which is positioned closer to an outer edge part of the buffer member than the soft part, and the soft part is more easily deformed than the hard part.