Laminated Battery Pack Thermal Connection for Even Cell Temperatures
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Solution Overview
Problem
In battery packs, large temperature differences between unit cells lead to uneven deterioration and reduced performance, particularly when high currents are applied, as existing cooling methods like air flow between ribs are inefficient, causing central cells to overheat.
Innovation Solution
A battery pack configuration with two laminated battery groups facing each other, directly or indirectly thermally connected, and housed in a case where the wide surfaces face the bottom surface, enhancing heat dissipation through thermal connection and increased cooling area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air flow cooling between ribs is used, then cooling is provided, but cooling efficiency is insufficient causing temperature distribution and central cell overheating
Solution Approach 1:
The patent transitions from one-dimensional air flow cooling (through ribs) to two-dimensional thermal management by arranging battery groups in a planar configuration with direct thermal connections between facing surfaces, enabling heat dissipation across multiple dimensions and locations simultaneously
Solution Approach 2:
The battery pack is divided into multiple battery groups with each group containing unit cells arranged in specific patterns. This segmentation allows independent thermal management of different regions and enables strategic placement of thermal connections to address local overheating issues
2Power
If large current is input and output for higher power, then output density increases, but heat generation from internal resistance increases
Solution Approach 1:
The patent converts the harmful heat generated by large current operation into a beneficial thermal management opportunity by designing direct thermal connections between battery groups, allowing the heat to be redistributed and dissipated across a larger area, turning the overheating problem into an efficient heat distribution system
3Quantity of substance
If unit cells are arranged in battery group, then power capacity is achieved, but temperature difference between unit cells causes uneven deterioration
Solution Approach 1:
The patent merges adjacent battery groups through direct thermal connections at their facing surfaces, creating a unified thermal management system that equalizes temperatures across all unit cells while maintaining the required power capacity through the combined battery group configuration
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 significantly reduces temperature differences between battery groups, improving heat dissipation and maintaining battery performance by ensuring even cooling across all cells.
Implementation Method 1
the facing surfaces of the first battery group and the second battery group are directly or indirectly thermally connected to each other
Data Source
AI summary
Provided is a battery pack including: a first battery group in which a plurality of storage batteries having a battery can side surface and a battery can bottom surface linked to the battery can side surface are laminated so that the battery can side surfaces face each other; a second battery group in which a plurality of storage batteries having a battery can side surface and a battery can bottom surface linked to the battery can side surface are laminated so that the battery can side surfaces are face each other; and a case housing the first battery group and the second battery group, wherein the facing surfaces of the first battery group and the second battery group are directly or indirectly thermally connected to each other.