Battery Cell Case With Exposed Metal Layer for Heat Dissipation
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Solution Overview
Problem
Existing battery modules are not efficient in dissipating heat generated by electrode bodies during charging, discharging, and short-circuit events.
Innovation Solution
A battery module design featuring a battery cell case with a metal layer and a fusion resin layer, where the metal layer is exposed at least partially on the outer face and in contact with a heat dissipation member, such as a battery module case or a condenser, to enhance heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat dissipation members are disposed between battery cells with laminate sheet cases, then heat dissipation is improved, but the contact area between heat dissipation member and battery cell case is limited by the laminate structure
Solution Approach 1:
The metal layer is extracted from the laminate sheet structure and exposed on the outer surface of the battery cell case. This allows the heat dissipation member to directly contact the high-thermal-conductivity metal layer rather than being separated by the resin layer, thereby increasing effective thermal contact area and improving heat dissipation efficiency
Solution Approach 2:
The battery cell case utilizes a composite laminate structure comprising both resin layer and metal layer. The resin layer provides hermetic sealing while the exposed metal layer provides high thermal conductivity for heat dissipation. This composite structure resolves the contradiction by allowing both sealing and efficient thermal contact
2Stability of the object's composition
If the battery cell case is fully covered by resin layer for hermetic sealing, then sealing performance is improved, but heat transfer efficiency deteriorates due to resin's low thermal conductivity
Solution Approach 1:
The battery cell case exhibits different properties in different regions: the resin layer covers most of the outer surface for hermetic sealing, while the metal layer is locally exposed at specific positions to provide high-thermal-conductivity contact areas for heat dissipation members. This local differentiation resolves the contradiction between sealing and heat transfer
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 design allows for efficient heat dissipation from the electrode body by increasing the contact area between the metal layer and the heat dissipation member, thereby alleviating the rate-determining process of the heat transfer path and improving overall thermal management.
Implementation Method 1
the battery cell case includes at least a metal layer and a fusion resin layer disposed at the inner face side of the metal layer and includes, at at least part of the outer face of the battery cell case, an exposed portion at which the metal layer is exposed, and the heat dissipation member is in contact with the exposed portion
Data Source
AI summary
A battery module includes a battery cell and a heat dissipation member that is in contact with a battery cell case. The battery cell includes an electrode body including plural layered structures layered one on another, each including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and the battery cell case that hermetically encloses the electrode body inside the battery cell case. The battery cell case includes at least a metal layer and a fusion resin layer disposed at the inner face side of the metal layer and has an exposed portion, at which the metal layer is exposed, at at least part of the outer face of the battery cell case. The heat dissipation member is in contact with the exposed portion.