Battery Pack Lead Plate Layout for Cell Emission Release
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Solution Overview
Problem
Lithium ion secondary battery cells in battery packs can cause unsafe events leading to emissions that damage adjacent cells due to the transfer of high-temperature gas and electrolyte through lead plates.
Innovation Solution
A battery pack design with an open space between adjacent secondary battery cells' electrodes, using a lead plate that forms a U-shaped gap to divert emissions away from adjacent cells, ensuring they are released to the outside.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lead plate completely closes the space between adjacent secondary battery cells, then electrical connection between cells is improved, but emissions from abnormal cells can transfer to adjacent cells through the lead plate causing damage
Solution Approach 1:
The lead plate is segmented to form a U-shape with an open space between adjacent battery cells. This segmentation allows the lead plate to perform dual functions: maintaining electrical connection while preventing emission transfer. The open space acts as a barrier that blocks the pathway for high-temperature gas and electrolyte to reach adjacent cells through the lead plate.
Solution Approach 2:
The U-shaped lead plate with open space acts as an intermediary structure between adjacent battery cells. It provides electrical connection while the open space configuration serves as a protective barrier that intercepts and blocks emissions before they can transfer to adjacent cells, thus mediating between the need for connection and the need for protection.
2Object-affected harmful factors
If an open space is provided between adjacent first electrodes, then emissions can be released to the outside reducing damage to adjacent cells, but electrical connection through the lead plate is reduced
Solution Approach 1:
The lead plate is divided into segments that form the U-shape structure with open spaces. This segmentation allows the structure to maintain electrical conductivity through the lead plate material while creating gaps that enable emission release paths, thus resolving the contradiction between connection reliability and emission management.
Solution Approach 2:
The lead plate has different local qualities: the solid portions provide electrical connection, while the open space portions provide emission release pathways. This local differentiation allows different regions of the same component to serve different functions, simultaneously achieving both electrical connection and emission management.
3Object-affected harmful factors
If a U-shaped lead plate with open space is used, then emissions are diverted away from adjacent cells, but the lead plate structure becomes more complex
Solution Approach 1:
The U-shaped lead plate with open spaces is formed by segmenting the lead plate structure. While this increases structural complexity compared to a solid plate, the segmentation is achieved through a single continuous U-shaped design rather than multiple separate components, thus managing complexity while achieving the emission diversion function.
Solution Approach 2:
The U-shaped lead plate performs multiple functions: electrical connection, structural support, and emission diversion. By integrating these functions into a single component design, the overall device complexity is managed while achieving the protective function against emissions.
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
This design effectively reduces the risk of damage to adjacent cells by allowing emissions to be safely expelled, minimizing the impact of abnormal events in one cell on others.
Implementation Method 1
by releasing these emissions to the outside from the open space, it is possible to reduce a situation where 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 provided with a safety valve, a battery holder for holding the plurality of secondary battery cells; and a lead plate with conductivity for connecting the end surface electrodes of the secondary battery cells adjacent to each other. The lead plate forms an open space between the first electrodes in the secondary battery cells adjacent to each other.