Pouch Battery Module Cooling Layout for Electrode Lead Hotspots
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Solution Overview
Problem
Conventional battery modules and packs face challenges in cooling performance due to temperature deviations within battery cells, particularly in pouch-type secondary batteries, where increased length leads to localized heating near electrode leads, necessitating improved cooling methods.
Innovation Solution
A battery module design incorporating a bus bar assembly connected to electrode leads, heatsinks, and cooling plates with a heat transfer member made of thermal interface material, along with a perimeter tube system for efficient cooling water flow, to address temperature deviations and enhance cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the total length of the pouch-type secondary battery is increased to obtain greater energy, then the energy capacity is improved, but the temperature deviation inside the battery cell becomes large and localized heating occurs near the electrode lead
Solution Approach 1:
The cooling system is segmented into multiple cooling plates (first cooling plate and second cooling plate) positioned at different locations along the battery cell. This segmentation allows different regions of the battery to be cooled independently, addressing the temperature deviation issue that arises when increasing battery length for greater energy capacity.
Solution Approach 2:
Different cooling strategies are applied to different parts of the battery cell. The first cooling plate contacts the electrode lead region where localized heating occurs, while the second cooling plate addresses other regions. This local quality approach ensures that each region receives appropriate cooling based on its specific thermal characteristics.
2Device complexity
If a conventional cooling system is used, then the structure is simple, but the cooling temperature deviation is not improved and localized heating persists
Solution Approach 1:
The cooling system transitions from a single-plane cooling approach to a multi-dimensional cooling architecture. Cooling plates are positioned at different orientations and locations, including contact with the electrode lead and other regions of the battery cell. This dimensional expansion of the cooling system enables effective heat removal from multiple heat generation zones simultaneously.
Solution Approach 2:
A heat transfer member is introduced as an intermediary between the battery cell and the cooling plates. This heat transfer member facilitates efficient thermal coupling between the battery components and the cooling system, enabling effective heat transfer from the electrode lead and other regions to the cooling plates without requiring direct contact in all areas.
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 solution effectively reduces cooling temperature deviations by rapidly transferring heat from the battery cells to cooling plates and heatsinks, improving overall cooling efficiency and preventing localized heating issues.
Implementation Method 1
at least one heatsink provided to at least one side of the at least one battery cell and the bus bar assembly
Implementation Method 2
the pair of heatsinks may have an inner channel for a cooling water to flow
Implementation Method 3
a pair of cooling plates connected perpendicular to the at least one heatsink and provided in direct contact with the bus bar assembly
Implementation Method 4
a heat transfer member configured to guide connection of the connection bus bar and the pair of cooling plates
Data Source
AI summary
A battery module includes a battery cell, a bus bar assembly connected to an electrode lead of the battery cell and positioned on both side surfaces of the battery cell, a heatsink positioned on at least one side of the battery cell and the bus bar assembly, and a pair of cooling plates connected perpendicularly to the heatsink and arranged in direct contact with the bus bar assembly.