Battery Cell Protective Frame for Impact Isolation and Space Efficiency
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Solution Overview
Problem
Secondary battery cells face damage from external impacts, leading to increased internal pressure and potential short circuits, which can cause malfunctions and reduce energy density due to inefficient use of space in the battery cell structure.
Innovation Solution
A battery cell design featuring a protective frame with insulating material and a connection unit that includes a current collecting member with higher rigidity than the protective frame, which is electrically connected to the electrode assembly and terminal, reducing the risk of short circuits and optimizing space for increased energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective structure is added to protect the electrode assembly from external impacts, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The protective frame is merged with the connection unit by coupling the current collecting member to the protective frame. This integration allows the structure to provide both protective function and electrical connection function simultaneously, reducing the number of separate components and simplifying the overall device structure while maintaining reliability.
Solution Approach 2:
The protective frame is designed to serve multiple functions: it provides mechanical protection against external impacts, maintains structural integrity, and serves as a mounting structure for the connection unit. The connection unit itself performs dual functions of electrical connection and structural support. This multi-functionality reduces the need for additional protective components.
2Reliability
If the protective frame is made with insulating material to prevent short circuits, then the reliability is improved, but the rigidity decreases
Solution Approach 1:
The protective frame is made of insulating material (such as plastic or resin) which provides electrical isolation to prevent short circuits. The current collecting member, which requires high rigidity and electrical conductivity, is made of a different material (metal) and is coupled to the protective frame. This composite approach allows each component to be optimized for its specific function: insulation for the frame and structural strength for the connection unit.
3Reliability
If a complex connective structure is used between electrode assembly and terminal, then the electrical connection reliability is improved, but the energy density decreases due to wasted space
Solution Approach 1:
The connection unit merges the electrical connection function with the structural support function. The current collecting member is coupled to the protective frame, creating an integrated structure that provides both electrical conductivity and mechanical strength. This integration eliminates the need for separate protective structures and connection components, reducing the overall space required and increasing energy density while maintaining connection reliability.
Data Source
AI summary
Electrode assemblies and battery cells including the electrode assemblies are disclosed. In some implementations, a battery cell includes: an electrode assembly; one or more protective assemblies disposed on at least one side of the electrode assembly; and a case having an internal space in which the electrode assembly is accommodated, wherein the one or more protective assemblies includes: a protective frame including an insulating material; and a connection unit coupled to the protective frame and electrically connected to the electrode assembly.