Partition Member With Liquid Encapsulation For Battery Pressure And Heat Management
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Solution Overview
Problem
Existing partition members in assembled batteries lack sufficient pressure resistance and heat conduction characteristics, as they do not adequately address the expansion of electrodes and generated gas pressure during charging and use.
Innovation Solution
A partition member design featuring an encapsulated body that retains a liquid and an outer package body, where specific relationships between the areas and volumes of the encapsulated body and the liquid, along with a gap between the outer package body and encapsulated body, enhance pressure resistance and heat conduction by allowing the liquid to move and absorb pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a partition member is disposed between single batteries to cool damaged batteries, then heat conduction is improved, but pressure resistance is insufficient
Solution Approach 1:
The partition member is segmented into an encapsulated body containing coolant and an outer package body structure. This segmentation allows the coolant to be isolated in a controlled environment while the outer structure provides mechanical strength and pressure resistance, resolving the contradiction between heat conduction effectiveness and structural durability.
Solution Approach 2:
The partition member uses a composite structure combining an encapsulated body (for heat conduction) with an outer package body (for pressure resistance). This composite design integrates materials and structures with different functional properties to simultaneously achieve both thermal management and mechanical strength requirements.
2Quantity of substance
If electrodes expand during charging, then battery capacity is improved, but adjacent members are compressed
Solution Approach 1:
The partition member structure incorporates cushioning capabilities in advance to accommodate electrode expansion during charging. The encapsulated body and outer package body are designed with appropriate clearance and flexibility to absorb expansion forces before they can compress adjacent members, preventing damage while maintaining full battery capacity.
Solution Approach 2:
The partition member is designed with dynamic characteristics that allow it to adapt to changing battery dimensions during charging cycles. The structure can flexibly respond to electrode expansion and contraction, maintaining appropriate spacing and preventing compression of adjacent components while preserving full battery capacity utilization.
3Duration of action of moving object
If gas is generated from electrolyte solution, then battery operation is maintained, but pressure increases
Solution Approach 1:
The partition member structure includes pre-designed pressure accommodation space within the encapsulated body and outer package body configuration. This space serves as a cushion to absorb pressure increases from gas generation during battery operation, maintaining safe internal pressure levels while allowing continuous battery operation.
Solution Approach 2:
The encapsulated body and outer package body utilize flexible structural characteristics that allow controlled deformation in response to internal pressure changes from gas generation. This flexibility enables the partition member to accommodate pressure increases during battery operation while maintaining structural integrity and preventing damage to adjacent components.
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 partition member achieves improved pressure resistance and heat conduction by allowing the liquid to move and absorb pressure, maintaining a sealed state and efficiently transferring heat, thus enhancing the safety and performance of assembled batteries.
Implementation Method 1
the liquid retained in the encapsulated body moves to the gap between the outer package body and the encapsulated body as a result of deformation of the outer package body and the encapsulated body when the external pressure increases
Implementation Method 2
it is possible to efficiently move heat generated by a single battery to an adjacent single battery
Data Source
AI summary
A partition member includes an encapsulated body capable of retaining a liquid, and an outer package body for accommodating the encapsulated body and the liquid. The area S1 of the encapsulated body when the outer package body and the encapsulated body are seen in a planar view from the thickness direction and the area S2 of a gap between the outer package body and the encapsulated body satisfy the relationship represented by formula 1 below, and the volume V1 of the liquid and the volume V2 of the encapsulated body satisfy the relationship represented by formula 2 below.S1/(S1+S2)≤0.99 and Formula 10.02≤V1/V2≤1.90 Formula 2