Stacked Battery Pack Layout for Leak and Short-Circuit Isolation
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Solution Overview
Problem
Existing battery pack structures face issues with liquid leakage and short circuits due to interference, and have inefficient packaging due to the placement of heat exchange and gas discharge routes on both end surfaces, affecting package efficiency.
Innovation Solution
A battery pack structure with a first and second battery pack sealed by covers of different materials and thicknesses, featuring a cooler between them to prevent liquid leakage and short circuits, and a larger space between the second cover and modules to absorb energy and secure a flue gas space, maintaining high package efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the passage for heat exchange medium is provided on the lower end surface, then heat exchange function is achieved, but liquid leakage and short circuit risk occurs during interference
Solution Approach 1:
The passage for heat exchange medium is extracted from the lower end surface and relocated to the side surface of the battery pack. This separation removes the liquid passage from the interference-prone lower surface, eliminating the risk of liquid leakage and short circuit during interference while preserving the heat exchange function through the side surface passage.
2Temperature
If passages and gas discharge routes are provided on both upper and lower end surfaces, then heat exchange and gas discharge functions are achieved, but package efficiency deteriorates
Solution Approach 1:
The heat exchange passage and gas discharge route are merged into a single passage structure on the side surface of the battery pack. This integration allows both heat exchange medium flow and gas discharge to occur through the same passage, eliminating the need for separate passages on multiple surfaces and improving package efficiency.
Data Source
AI summary
The battery pack structure includes: a first battery pack in which a first battery module including a plurality of stacked battery cells is housed in a first case and a first cover that seals the first case from above; and a second battery pack located below the first battery pack, wherein a second battery module including a plurality of stacked battery cells is housed in a second case and a second cover that seals the second case from below.