Battery Pack Compression Using Porous Spacers With Gas Flow Channels
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Solution Overview
Problem
Conventional battery packs face challenges in maintaining a stable restriction load on secondary batteries, especially at low state of charge, due to the porous material's inability to return to its original thickness and inhale air effectively, leading to insufficient compression during discharge.
Innovation Solution
A battery pack design featuring a porous elastic member with communication holes that can deform by taking in or discharging gas, including a gas flow channel extending from the outer edge to the inside, and optionally a different member with a gas flow channel on its surface, ensuring the porous elastic member can expand and maintain stable compression even during discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the porous material is tightly held between the side surfaces of the secondary batteries, then the restriction load is maintained during charge, but the porous material cannot inhale air effectively and cannot return to original thickness during discharge
Solution Approach 1:
The porous elastic member is divided into multiple porous blocks arranged in series between adjacent secondary batteries. This segmentation creates multiple communication holes that extend from the outer edge to the inside of each block, forming a network of gas flow channels that enable effective air intake while maintaining compression force
Solution Approach 2:
The porous elastic member acts as an intermediary between the restriction mechanism and the secondary batteries. It transmits the restriction load while its porous structure with communication holes allows air to penetrate through, mediating between the need for mechanical compression and the need for gas permeability
2Reliability
If the porous material is compressed during charge to prevent excessive restriction load, then the safety is improved, but the material does not return to original size during discharge causing restriction load to decrease
Solution Approach 1:
The invention uses porous elastic members with controlled porosity (30-80%) that can be compressed during charge to absorb excess restriction load. The porous structure allows air to enter during discharge, enabling the material to expand back to its original thickness and restore the restriction load, thus maintaining both reliability and compositional stability
Solution Approach 2:
The physical state of the porous elastic member changes dynamically between compressed and expanded states based on the charge-discharge cycle. During charge, the member is compressed (parameter change in thickness); during discharge, air intake restores the original thickness. This parameter change enables the member to adapt to different operational requirements
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
This design allows for stable maintenance of the secondary battery's compression and prevents a decrease in the restriction load, ensuring consistent performance even at low state of charge by facilitating easier air intake and expansion of the porous elastic member.
Implementation Method 1
The porous elastic member includes a plurality of communication holes that communicate with outside and is configured to be deformable elastically in the arrangement direction by taking in or discharging gas
Implementation Method 2
the porous material is tightly held between the side surfaces of the secondary batteries and the porous material is hardly exposed to outside air. The porous material needs to inhale gas in order to be returned to the original thickness
Data Source
AI summary
A battery pack disclosed herein includes a plurality of rectangular secondary batteries, a porous elastic member disposed between the rectangular secondary batteries, and a restriction mechanism that applies a restriction load on the rectangular secondary batteries and the porous elastic member. The porous elastic member includes a gas flow channel extending from an outer edge to the inside in a state where the porous elastic member is assembled to the battery pack.