Pouch Battery Cell Structure for Cooling and Directed Gas Venting
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Solution Overview
Problem
Pouch-shaped battery cells face challenges in cooling efficiency and gas discharge direction during thermal events, leading to potential accidents such as fire or explosion.
Innovation Solution
The battery cell design features thermally conductive metal side plates and a notch for gas discharge, with electrode leads facing each other and protruding outward for enhanced cooling and controlled gas release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pouch case is made of laminate sheet with thermal fusion sealing, then hermetic sealing is achieved, but cooling efficiency deteriorates due to inability to cool through folding parts
Solution Approach 1:
The battery case is divided into two distinct parts: a laminate sheet portion for hermetic sealing and metal side plates for thermal conduction. This segmentation allows each material to perform its optimal function without compromise.
Solution Approach 2:
The battery case uses a composite structure combining laminate sheet and metal materials. The metal side plates are coupled to the laminate sheet, creating a hybrid structure that achieves both hermetic sealing and effective cooling through opposite side surfaces.
2Object-generated harmful factors
If gas discharge opening is provided on battery case, then gas can be discharged, but gas may be discharged to undesired position causing case breakage
Solution Approach 1:
A gas discharge guide structure acts as an intermediary between the gas discharge opening and the external environment. This guide directs the discharged gas to a predetermined safe position, preventing uncontrolled gas release that could cause case breakage.
3Productivity
If electrode assembly is continuously charged despite gas generation, then charging capacity is maintained, but temperature increases causing ignition or explosion
Solution Approach 1:
The gas discharge mechanism provides feedback about the battery's internal state. When gas is generated, the discharge opening activates, allowing the system to release pressure and prevent dangerous temperature buildup while maintaining charging operations.
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 design improves cooling efficiency and minimizes secondary accidents by guiding gas to a desired position, increasing energy density and safety.
Implementation Method 1
each of opposite side surfaces of a pouch case is made of a metal material, thereby improving cooling efficiency
Data Source
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AI summary
The present invention relates to a pouch-shaped battery cell having an easily coolable structure and a manufacturing method thereof, and more particularly to a pouch-shaped battery cell including an electrode assembly having a pair of electrode tabs connected thereto and a case configured to receive the electrode assembly, wherein a pair of electrode leads configured to be connected respectively to the pair of electrode tabs of the electrode assembly is fixed to the case, and a manufacturing method thereof.