Battery Stack Thermal Management via Interlayer Coolant Duct
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Solution Overview
Problem
The alignment of multiple battery stacks in vehicles can lead to nonuniform temperature distribution, causing uneven deterioration of unit cells due to heat transfer from lower stacks to upper ones, resulting in potential performance and lifespan issues.
Innovation Solution
A configuration where a first battery stack is positioned above a second battery stack, with a coolant duct placed between them to prevent heat transfer, and electronic equipment is positioned under the ducts to control charging and discharging, using a supporting member and reinforcement frame to ground the shielded wire harness for efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple battery stacks are arranged vertically to save space, then the device density is improved, but heat transfer from lower stacks to upper stacks causes nonuniform temperature distribution
Solution Approach 1:
A duct is introduced as an intermediary component between the first battery stack and the second battery stack. The duct serves as a thermal barrier that prevents heat transfer from the lower battery stack to the upper battery stack, thereby maintaining temperature uniformity while allowing vertical arrangement for compactness.
Solution Approach 2:
The battery system is segmented into multiple stacks arranged vertically, with each stack thermally isolated from others through the use of ducts. This segmentation approach allows each battery stack to be independently temperature-controlled, preventing heat accumulation and nonuniform temperature distribution while maximizing space utilization.
2Area of stationary object
If battery stacks are arranged in intersecting patterns, then space utilization is improved, but partial heating of upper stacks occurs leading to cell deterioration
Solution Approach 1:
The duct acts as a thermal intermediary that blocks heat pathways between battery stacks arranged in intersecting patterns. By positioning the duct between the first and second battery stacks, heat generated in the lower stack cannot reach the upper stack, preventing localized heating and ensuring uniform cell conditions across the entire battery system.
Solution Approach 2:
The thermal isolation approach applies local quality control by specifically addressing the thermal environment of each battery stack independently. The duct provides localized thermal barrier functionality at the interface between stacks, ensuring that each stack operates within its own thermal zone, thereby maintaining uniform cell deterioration conditions across all stacks.
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 configuration effectively inhibits heat transfer from lower to upper battery stacks, reducing temperature nonuniformity and thereby minimizing cell deterioration, ensuring consistent performance and extended lifespan of the battery cells.
Implementation Method 1
a duct for coolant. The duct is disposed along the first battery stack and is positioned between the first battery stack and the second battery stack
Implementation Method 2
a duct for coolant
Data Source
AI summary
An electricity storage device includes: a first battery stack (15) including a plurality of cells that are aligned in a first direction; a second battery stack (11 to 14) including a plurality of cells that are aligned in a second direction different from the first direction, the second battery stack being placed under the first battery stack; and a duct for coolant. The duct is disposed along the first battery stack and is positioned between the first battery stack and the second battery stack.