Embedded Frame for Pouch Battery Dimensional Stability
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Solution Overview
Problem
Conventional pouch-type secondary batteries are prone to electrode assembly deformation and crushing during vacuum pressure application due to the low hardness of the separator and flexible pouch casing, leading to dimension instability and potential capacity reduction.
Innovation Solution
An embedded frame with a rectangular shape is integrated into the pouch casing, featuring a reception space for the electrode assembly, multiple pores for electrolyte storage, and elastic means like springs to maintain shape and absorb external forces, while preventing heat transfer and ensuring reliable protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum pressure is applied to the pouch casing during manufacturing, then the pouch-type secondary battery can be sealed and formed, but the corners of the forming part are easily crushed and deformed due to low separator hardness and flexible pouch casing
Solution Approach 1:
The patent applies local quality by adding a reinforcing member specifically at the corners of the pouch casing where deformation occurs during vacuum sealing. This localized reinforcement provides structural support exactly where needed without making the entire pouch casing rigid, thus preventing corner crushing while maintaining the flexibility required for vacuum sealing and electrode assembly protection.
Solution Approach 2:
The patent employs composite materials by combining the flexible pouch casing material with a rigid or semi-rigid reinforcing member (such as a corner protector or frame). This composite structure integrates the advantages of both materials: the flexibility and lightness of the pouch casing with the structural strength of the reinforcing member, thereby preventing deformation during manufacturing while maintaining the desired flexible characteristics.
2Adaptability or versatility
If the pouch casing is made of flexible material to enable easy adaptation to desired battery shapes, then adaptability is improved, but the pouch casing cannot reliably protect the electrode assembly from external forces
Solution Approach 1:
The patent applies local quality by strategically placing reinforcing members at critical locations (corners and edges) of the pouch casing where external forces are most likely to cause damage. This localized reinforcement provides enhanced protection at vulnerable points while maintaining the overall flexibility and adaptability of the pouch casing for various battery shapes and installation configurations.
Solution Approach 2:
The patent employs beforehand cushioning by incorporating reinforcing members and corner protectors into the pouch casing structure before the battery is subjected to external forces during use or installation. These pre-installed protective elements are designed to absorb and distribute external impacts, preventing direct transmission of forces to the electrode assembly and thereby providing advance protection against potential damage.
3Weight of moving object
If the separator is made of thin material with low hardness to reduce weight and improve flexibility, then weight is reduced, but the separator cannot prevent crushing and deformation of the electrode assembly under vacuum pressure
Solution Approach 1:
The patent employs an intermediary approach by introducing a reinforcing member as a mediator between the thin separator and the external vacuum pressure. The reinforcing member acts as a structural intermediary that distributes and bears the vacuum load, preventing direct transmission of crushing forces to the thin separator and electrode assembly, thereby maintaining structural integrity while allowing the separator to remain thin and lightweight.
Solution Approach 2:
The patent applies the principle of flexible shells and thin films by using a thin separator material that provides the necessary separation function while incorporating a flexible but structurally supportive pouch casing with localized reinforcement. The reinforced pouch casing acts as a flexible shell that maintains its shape under vacuum pressure, preventing deformation of the thin separator and electrode assembly inside, thus achieving both weight reduction and structural integrity.
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 embedded frame prevents electrode assembly deformation, maintains precise dimensions, enhances battery capacity by controlled electrolyte distribution, and provides reliable protection against external forces and heat transfer.
Implementation Method 1
A plurality of pores is formed in the embedded frame... the embedded frame storing electrolyte therein discharges an appropriate amount of electrolyte when needed and supplies it into the pouch casing
Implementation Method 2
elastic means like springs to maintain shape and absorb external forces
Data Source
AI summary
The present invention relates to an embedded frame for pouch-type secondary batteries and a secondary battery having the embedded frame. The embedded frame is provided in a pouch casing for a secondary battery so as to maintain the external shape of the pouch casing and additionally protect an electrode assembly from an external shock. The embedded frame has a rectangular shape and makes close contact with an inner surface of the pouch casing. The electrode assembly is housed in the embedded frame. A plurality of pores is formed in the embedded frame.