Secondary Battery Case Holder for PCM Stability
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Solution Overview
Problem
Pouch type secondary batteries are vulnerable to external impact due to their structure, which can lead to damage and instability, particularly affecting the protection circuit module (PCM) when subjected to external forces.
Innovation Solution
The design incorporates a case holder with a hollow structure and ribs for enhanced rigidity, a protrusion to support the PCM, and a plate attached via an adhesion member, along with a unique pouch configuration to prevent interference and improve structural stability, allowing the electrode tab to be exposed and securely connected to the PCM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a pouch type structure is used for the secondary battery, then high energy density and space utilization are achieved, but vulnerability to external impact increases
Solution Approach 1:
The protective case is divided into multiple segments: a case holder that fits into a case cavity, a case top, a case bottom, and plates. This segmentation allows each component to perform its specific protective function while maintaining the overall pouch structure's energy density advantages.
Solution Approach 2:
The protective case combines multiple materials with different properties: the case holder provides structural support, the plates (metal or hard material) provide impact resistance, and the pouch material maintains flexibility and energy density. This composite structure resolves the contradiction between soft pouch benefits and impact resistance needs.
2Device complexity
If the PCM is directly connected to the electrode tab without additional support structures, then device complexity is reduced, but stability under external forces deteriorates
Solution Approach 1:
The case holder acts as an intermediary component between the electrode assembly/pouch and the PCM. It provides a stable mounting surface and protective enclosure for the PCM, ensuring its stability under external forces while maintaining relatively simple overall structure.
3Reliability
If a rigid protective structure is added to protect the PCM, then resistance to external impact is improved, but the pouch type structure's flexibility and space utilization are compromised
Solution Approach 1:
Rigid protective elements (plates, case holder) are applied locally only where needed for PCM protection and structural support, rather than making the entire battery rigid. The pouch structure remains flexible in areas not requiring protection, maintaining space utilization and energy density benefits.
Data Source
AI summary
A secondary battery includes a bare cell including an electrode assembly, an electrode tab drawn upwardly from the electrode assembly, and a pouch surrounding the electrode assembly, the electrode tab being exposed to an outside through the pouch, a protection circuit module (PCM) connected to the electrode tab, a case holder disposed between the pouch and the PCM to support the PCM, a case top on the bare cell, the PCM and the case holder being covered by the case top, a case bottom at a bottom side of the bare cell, and a plate attached to a side surface of the bare cell, the plate being coupled to the case top and the case bottom.