Battery Heat Transfer Plate Segmentation for Thermal Management
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Solution Overview
Problem
Existing lithium ion secondary batteries face issues with internal short-circuits due to overcharge or external pressure, leading to overheating and rapid thermal decomposition, which is exacerbated by the low heat-transfer efficiency of adhesive layers used in heat release plates.
Innovation Solution
A battery design featuring a heat transfer plate with a region in direct contact with the casing and a separate region with a joining material, such as double-sided tape or adhesive, to efficiently dissipate heat, ensuring reliable attachment and effective heat release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive layer is used to join the heat release plate to the outer casing, then the plate can be securely attached, but heat transfer efficiency deteriorates due to the low thermal conductivity of the adhesive material
Solution Approach 1:
The heat release plate is divided into two distinct regions: a first region that directly contacts the outer casing for optimal heat transfer, and a second region that provides attachment functionality. This segmentation allows each region to be optimized for its specific function without compromise.
Solution Approach 2:
Different regions of the heat release plate are assigned different functions and properties. The first region has high thermal conductivity for heat transfer, while the second region is designed for attachment. This local differentiation resolves the contradiction by ensuring that the heat transfer path remains free of adhesive layers while still providing secure attachment capabilities.
2Temperature
If metal powder is added to the adhesive agent to improve thermal conductivity, then heat transfer efficiency improves, but adhesion strength deteriorates and cost increases
Solution Approach 1:
The plate is segmented into a heat transfer region and an attachment region, eliminating the need to compromise adhesive formulation. The attachment region can use standard adhesive materials without metal powder, preserving adhesion strength while the heat transfer region maintains optimal thermal conductivity through direct material contact.
Solution Approach 2:
The heat transfer function is extracted from the adhesive layer and placed directly into the heat release plate structure itself. This removes the conflicting requirement from the adhesive material, allowing it to focus solely on providing strong adhesion without the need for thermal conductivity enhancements that would compromise bonding strength.
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 design allows for prompt heat dissipation from the battery casing, effectively preventing thermal decomposition of the positive electrode active material and electrolyte, enhancing the reliability of the battery by improving heat transfer efficiency without compromising adhesion strength.
Implementation Method 1
a heat transfer plate 30 for dissipating heat generated in the casing 20 (that is, the power generating element 10) to the outside
Data Source
Figure 1
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AI summary
Provided is a battery which is able to promptly release heat from a casing including a power generating element housed therein, and reliably prevent the occurrence of rapid thermal decomposition and the like of one of a positive electrode active material and an electrolyte from. In the battery including a positive electrode member, a negative electrode member, a casing, and a heat transfer plate, the heat transfer plate 30 is configured to have a region 30a in contact with the outer surface of the casing 20 and a region 30b provided with a joining material (double-sided tape 50a) for joining the heat transfer plate to the outer surface of the casing, thereby efficiently dissipating heat in the casing (outer casing) from the region 30a in direct contact with the outer surface of the casing. The region 30b of the heat transfer plate provided with the joining material serves as a step section at a level lower than the region of the heat transfer plate in contact with the casing. In addition, the region of the heat transfer plate provided with the joining material is used as through holes 32a, 32b, and the joining material filling the through holes bonds the heat transfer plate to the outer surface of the casing.