Stacked Battery Pack Structure for Heat Propagation Isolation
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Solution Overview
Problem
Existing stacked battery packs with flat cells face issues of abnormal heat propagation due to simple metal plate configurations, which can lead to overheating and fire risks, and require complex support mechanisms for stable cell arrangement.
Innovation Solution
A stacked battery pack design featuring resin holders, flat cells, and metal plates with protrusions, where the resin holders and metal plates interpose between cells to provide heat insulation, dissipation, and fire protection, and the cells are stacked perpendicular to the support surface, eliminating the need for complex support mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a metal plate is used to stack flat cells, then the structure is simple, but abnormal heat generation propagates to adjacent cells through the metal plate
Solution Approach 1:
The patent uses a composite structure consisting of a resin holder and a metal plate. The resin holder provides heat insulation to prevent heat propagation, while the metal plate provides heat dissipation. This composite material approach resolves the contradiction by combining materials with opposite thermal properties to achieve both structural simplicity and heat management.
Solution Approach 2:
Different parts of the stacking structure have different thermal properties: the resin holder portion provides heat insulation where needed to prevent abnormal heat propagation, while the metal plate portion provides heat dissipation in other areas. This local differentiation of material properties solves the heat propagation problem while maintaining structural simplicity.
2Object-affected harmful factors
If a heat insulating sheet is sandwiched between two metal plates to prevent heat propagation, then heat insulation is improved, but the structure becomes complicated
Solution Approach 1:
The patent extracts the heat insulating function from the metal plate structure and assigns it to a separate resin holder component. This separation allows the metal plate to focus on heat dissipation while the resin holder handles heat insulation, simplifying the overall structure compared to sandwiching an insulating sheet between metal plates.
Solution Approach 2:
The resin holder serves multiple functions: it provides heat insulation to prevent heat propagation, supports the flat cells, and works in conjunction with the metal plate for heat dissipation. This multi-functionality reduces the need for separate components, simplifying the overall structure while maintaining effective heat management.
3Volume of moving object
If flat cells are arranged parallel to the support surface, then space utilization is improved, but a complicated support mechanism is required to stabilize the cells
Solution Approach 1:
The patent changes the stacking direction from horizontal (parallel to support surface) to vertical (perpendicular to support surface). This dimensional change allows the resin holder to provide inherent structural support, eliminating the need for complicated support mechanisms while maintaining efficient space utilization through vertical stacking.
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 prevents abnormal heat propagation, enhances heat dissipation, and provides fire protection while simplifying the support structure, ensuring stable cell arrangement and efficient heat management.
Implementation Method 1
the resin holder and the metal plate are interposed between the flat cells adjacent in the stacking direction, so that it is possible to achieve a heat insulating effect by the presence of the resin holder
Implementation Method 2
a heat capacity enhancing effect, a heat dissipation effect, and a fire protection effect by the presence of the metal plate
Implementation Method 3
the protrusion parts adjacent in the stacking direction may be connected through a heat conducting member or may be connected directly. With this configuration, the heat capacity can be significantly enhanced, so that even if a given flat cell abnormally generates heat, the heat is efficiently dissipated through the plurality of protrusion parts
Implementation Method 4
a heat capacity enhancing effect, a heat dissipation effect, and a fire protection effect by the presence of the metal plate
Data Source
AI summary
Disclosed herein is a stacked battery pack that includes a plurality of unit cells stacked in a stacking direction. Each of the plurality of unit cells includes a resin holder, a flat cell housed in the resin holder, and a metal plate covering the flat cell, thereby the flat cell is sandwiched between the resin holder and the metal plate in the stacking direction.