Battery Pack Cell Separation and Lead Cooling Against Thermal Propagation
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Solution Overview
Problem
The increasing demand for secondary batteries in mobility applications necessitates improved safety measures due to the potential risks of fires and thermal propagation, which existing technologies have not adequately addressed.
Innovation Solution
A battery pack design featuring a pack housing with a bottom plate and a battery assembly that includes a separation structure with cell accommodation spaces and venting channels, coupled with a heat dissipation fin to thermally couple electrode leads to the bottom plate, enhancing cooling efficiency and preventing thermal propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If battery cells are densely packed to increase energy density, then productivity and space utilization improve, but thermal propagation risk and safety deteriorate
Solution Approach 1:
The battery pack divides battery cells into separate modules using partition walls with cooling channels. Each module is independently cooled and isolated, preventing thermal propagation between cells while maintaining high density packaging.
Solution Approach 2:
Cooling channels act as intermediary structures between adjacent battery cells, providing thermal isolation and active cooling. These channels serve as buffer zones that prevent direct thermal contact while enabling heat dissipation.
2Reliability
If cooling channels are added to prevent thermal propagation, then safety improves, but device complexity increases
Solution Approach 1:
The partition walls serve dual functions as both structural separators and cooling channels. By merging the separation function with the cooling function into a single integrated component, the design avoids adding separate complex cooling systems while maintaining safety.
Solution Approach 2:
The partition wall structure performs multiple functions simultaneously: mechanical separation of cells, thermal isolation barrier, and fluid cooling channel. This multi-functionality reduces overall system complexity by eliminating the need for separate components for each function.
3Temperature
If heat dissipation structures are implemented, then cooling efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The electrode leads themselves serve as heat dissipation pathways by being thermally coupled to cooling channels. The existing structural components (electrode leads, partition walls) are designed to perform both their primary functions and heat dissipation, eliminating the need for separate heat dissipation components.
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 cooling efficiency, prevents thermal propagation and serial ignition of battery cells, and ensures safe directional venting of high-temperature gases, thereby increasing the safety and energy density of the battery pack.
Implementation Method 1
a heat dissipation fin configured to thermally couple at least one of electrode leads of the plurality of battery cells to the bottom plate
Implementation Method 2
a pack housing including a bottom plate with a cooling channel
Implementation Method 3
the plurality of venting channels may extend in the second direction to guide a gas in the second direction
Data Source
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AI summary
The present technology provides a battery pack including a pack housing including a bottom plate with a cooling channel, and a battery assembly mounted in the pack housing, in which the battery assembly includes a separation structure with a plurality of cell accommodation spaces separated from each other in a first direction, a plurality of battery cells accommodated in the plurality of cell accommodation spaces of the separation structure and extending in a second direction perpendicular to the first direction, and a heat dissipation fin configured to thermally couple at least one of electrode leads of the plurality of battery cells to the bottom plate.