Laminated Battery Pack Layout for Lower Cell Temperature Differences
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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 insufficient, causing central cells to overheat.
Innovation Solution
A battery pack configuration with two laminated battery groups, where each group's facing surfaces are thermally connected, either directly or indirectly, to reduce temperature differences, using a case that houses these groups and incorporates heat transfer members for enhanced cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air flow cooling between ribs is used, then heat dissipation is improved, but temperature difference between unit cells increases and central cells overheat
Solution Approach 1:
The patent transitions from one-dimensional air flow cooling (between ribs) to three-dimensional thermal management by thermally connecting facing surfaces of battery groups. This dimensional change allows heat to be dissipated through multiple pathways simultaneously, preventing localized overheating while maintaining overall heat dissipation efficiency.
Solution Approach 2:
The patent merges multiple battery groups into an integrated thermal management system where facing surfaces are thermally connected. This combining approach allows heat from multiple units to be distributed and dissipated collectively, reducing temperature differences between individual cells while maintaining effective heat removal.
2Power
If large current is input and output for higher power, then battery capacity utilization is improved, but heat generation increases and temperature rises
Solution Approach 1:
The patent introduces thermally conductive intermediaries (heat dissipation members) between battery groups that act as mediators for heat transfer. These intermediaries facilitate efficient heat removal from high-power operating batteries, enabling large current operation while maintaining temperature control through enhanced thermal pathways.
3Quantity of substance
If unit cells are arranged in battery group for higher capacity, then energy density is improved, but temperature difference between cells increases
Solution Approach 1:
The patent segments the battery system into multiple groups with thermally connected facing surfaces. This segmentation allows each group to be managed independently while maintaining thermal equilibrium through the connections, enabling high capacity configuration without excessive temperature differences between cells.
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 reduces temperature differences between battery groups, improving heat dissipation and maintaining consistent performance even under high current conditions.
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.