Battery Pack Lead Plate Venting for Cell Emission Isolation
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Solution Overview
Problem
Lithium-ion secondary battery cells in battery packs can cause unsafe events, leading to high-temperature gas and electrolyte emissions that can damage adjacent cells through connected lead plates, potentially causing fires.
Innovation Solution
A battery pack design with lead opening windows between adjacent secondary battery cells and insulating plates to allow emissions to be released externally, reducing the impact on neighboring cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lead plate is used to connect adjacent secondary battery cells, then electrical conductivity between cells is improved, but emissions from faulty cells can spread to adjacent cells through the lead plate
Solution Approach 1:
The lead plate is segmented by providing lead opening windows that divide the continuous plate into separate regions. This segmentation allows the lead plate to maintain electrical connectivity while creating isolated zones that prevent emissions from spreading between adjacent battery cells through the lead plate structure.
Solution Approach 2:
The lead opening windows act as intermediary elements between adjacent battery cells connected by the lead plate. These openings serve as a mediating structure that allows electrical connection to be maintained while blocking the transmission of harmful emissions, effectively mediating between the need for conductivity and the need for emission containment.
2Ease of manufacture
If a complete lead plate is used to connect battery cells, then manufacturing simplicity is improved, but safety is worsened due to potential emission transmission
Solution Approach 1:
The lead plate incorporates lead opening windows that segment the plate structure, creating a design that is still relatively simple to manufacture while significantly improving safety. The segmentation is achieved through standard manufacturing processes that cut or form openings in the lead plate, maintaining ease of production while enhancing safety performance.
Solution Approach 2:
The design converts the potential harm of a continuous lead plate (emission transmission) into a benefit by strategically placing openings. These openings, which might seem to reduce structural integrity, actually serve to block emission pathways while maintaining electrical connectivity, turning a safety risk into a safety feature.
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 effectively contains emissions from one faulty cell, minimizing damage to adjacent cells by directing them outside, thereby enhancing safety.
Implementation Method 1
an insulating plate with insulation property for covering a surface of the lead plate
Implementation Method 2
by releasing these emissions to the outside from the open space, it is possible to reduce a situation in which other adjacent secondary battery cells are adversely affected
Data Source
AI summary
A battery pack includes a plurality of secondary battery cells arranged in parallel to each other in a longitudinal direction, each of the plurality of secondary battery cells including end surface electrodes each on both ends, at least one of the end surface electrodes being a first electrode including a safety valve, a battery holder for holding the plurality of secondary battery cells, a lead plate with conductivity for connecting the end surface electrodes of the secondary battery cells adjacent to each other, and an insulating plate with insulation property for covering a surface of the lead plate. The lead plate includes a lead opening window between the first electrodes of the adjacent secondary battery cells, and the insulating plate includes an insulation opening window in a position corresponding to the lead opening window.