Secondary Battery Current Collector Structure for Reliable Energy Density
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Solution Overview
Problem
Conventional secondary batteries face challenges in achieving high energy density and reliability.
Innovation Solution
A secondary battery design featuring a current collecting portion composed of multiple conductive members, including a first member joined to the electrode assembly, a second member fixed on the sealing plate, and a third member connecting them, with a line-shaped or strip-shaped configuration, to enhance electrical conductivity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire bonding or ribbon bonding is applied to electric connection in a battery, then electrical connection is achieved, but energy density and reliability are insufficient
Solution Approach 1:
The current collecting portion is divided into multiple members (first member, second member, third member) with distinct functions. The first member collects current from the electrode assembly, the second member is fixed to the sealing plate, and the third member connects them. This segmentation allows each component to be optimized for its specific function, improving overall reliability while maintaining manageable complexity through clear functional division.
Solution Approach 2:
The third member acts as an intermediary component that electrically connects the first member (attached to electrode assembly) and the second member (attached to sealing plate). This intermediary structure provides a reliable electrical connection path while allowing independent optimization of the connection points at the electrode assembly and sealing plate, thereby improving reliability without requiring a monolithic complex structure.
2Quantity of substance
If conventional electrode terminal connection is used, then battery assembly is simple, but energy density is insufficient
Solution Approach 1:
The current collecting portion is divided into multiple members (first member, second member, third member) with distinct functions. The first member collects current from the electrode assembly, the second member is fixed to the sealing plate, and the third member connects them. This segmentation allows each component to be optimized for its specific function, improving overall reliability while maintaining manageable complexity through clear functional division.
Solution Approach 2:
The third member acts as an intermediary component that electrically connects the first member (attached to electrode assembly) and the second member (attached to sealing plate). This intermediary structure provides a reliable electrical connection path while allowing independent optimization of the connection points at the electrode assembly and sealing plate, thereby improving reliability without requiring a monolithic complex structure.
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 energy density and reliability by ensuring effective electrical connection between the electrode assembly and the electrode terminal, facilitating high-capacity and efficient energy transfer.
Implementation Method 1
a third member having electric conductivity, the third member electrically connecting the first member and the second member
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A secondary battery includes: an electrode assembly (200); a case (100) that accommodates the electrode assembly (200), the case (100) including a case main body (110) provided with an opening and a sealing plate (120, 130); an electrode terminal (300); and a current collecting portion (400), wherein the current collecting portion (400) includes a first member (430) having electric conductivity, the first member (430) being joined to the electrode assembly (200), a second member (440) having electric conductivity, the second member (440) being fixed on an inner surface of the sealing plate, the second member (440) being joined to the electrode terminal (300), and a third member (460) having electric conductivity, the third member (460) being constituted of a member different from the first member (430) and the second member (440), the third member (460) electrically connecting the first member (430) and the second member (440).