Battery Pack Holder Structure for PCB Stability and Short-Circuit Protection
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Solution Overview
Problem
Pouch-type secondary batteries face issues with mechanical weakness, moisture penetration, and safety risks due to combustible materials, along with complex manufacturing processes that lead to high defect rates and reduced product durability.
Innovation Solution
A secondary battery pack design featuring a holder with a partition wall, insulating molding member, and a protection circuit module configuration that stabilizes the PCB, prevents movement, and enhances durability through a hook structure and insertion holes, while using a heat radiating portion to manage heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a pouch-type secondary battery is used to reduce volume and mass, then the battery achieves flexibility and compactness, but the mechanical strength decreases and safety issues arise due to weak pouch structure
Solution Approach 1:
The patent embeds the soft pouch-type battery inside a rigid holder structure, creating a nested configuration where the flexible battery is protected by the rigid outer shell. This resolves the contradiction by maintaining the compact volume of the pouch battery while gaining the mechanical strength of the rigid holder.
Solution Approach 2:
The patent combines the soft pouch material with a rigid holder structure to create a composite battery assembly. This composite structure integrates the advantages of both materials: the flexibility and compactness of the pouch with the mechanical strength and safety of the rigid holder.
2Strength
If a rigid holder structure is added to protect the battery, then mechanical strength and safety are improved, but device complexity increases
Solution Approach 1:
The rigid holder is designed to serve multiple functions simultaneously: providing mechanical strength and protection, preventing moisture penetration, stabilizing the PCB, and managing heat dissipation. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Device complexity
If the PCB is directly mounted in the PCM case without additional stabilization, then device complexity is reduced, but manufacturing precision decreases due to movement and damage during assembly
Solution Approach 1:
The holder structure is pre-designed with integrated PCB stabilization features, such as recesses and positioning structures, that automatically stabilize the PCB during assembly. This preliminary design prevents movement and damage during the manufacturing process without requiring complex additional stabilization steps.
4Use of energy by moving object
If various combustible materials are embedded in the pouch-type battery, then energy density is improved, but safety worsens due to risk of heat generation and explosion
Solution Approach 1:
The rigid holder structure serves as a protective barrier that cushions and isolates the combustible materials inside the pouch battery from external impacts and thermal sources. This pre-established protection reduces the risk of heat generation and explosion while maintaining the high energy density of the combustible materials.
Data Source
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AI summary
Provided is a secondary battery pack having effectively improved manufacturing efficiency and product durability. In this regard, the secondary battery pack includes: a battery cell; a protection circuit module mounted on a terrace structure where an electrode lead is formed; a holder including a body portion having a plate shape such that the battery cell is mounted on one surface, and a partition wall protruding from the body portion in an upward direction to surround at least a portion of a side portion of the battery cell in a horizontal direction; and an insulating molding member including an electrical insulating material, and including a protecting portion coated on and bonded to at least one region of a printed circuit board and a fixing portion protruding and extending from the protecting portion in a direction where the partition wall is located and fixed to one region of the partition wall.