Multilayered cylindrical battery module having heat dissipation and chain ignition preventing structure and battery pack comprising same
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Solution Overview
Problem
Conventional multilayer cylindrical secondary battery modules face challenges in efficiently dissipating heat and preventing chain ignition when positive and negative electrode terminals face each other vertically, complicating electrical connections and making it difficult to secure both heat dissipation and gas discharge spaces.
Innovation Solution
A multilayer battery module design featuring first and second cylindrical battery cells arranged in a matrix form with a heatsink interposed between them, where the heatsink has a convex portion for gas discharge and a closely adhered portion for heat dissipation, allowing for efficient heat and gas discharge paths, and additional heat transfer pads for enhanced thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If positive and negative electrode terminals are arranged to face each other vertically in a multilayer battery module, then electrical connection is simplified, but heat dissipation and gas discharge spaces cannot be secured
Solution Approach 1:
The battery module is divided into multiple layers with battery cells arranged in a matrix pattern. By segmenting the structure into first and second layers with alternating terminal orientations, the design achieves both simplified electrical connections and adequate heat dissipation spaces. The segmentation allows heat to be distributed across multiple surfaces rather than concentrated in one area.
Solution Approach 2:
The patent transitions from a single-layer arrangement to a multilayer three-dimensional structure. By adding the vertical dimension with multiple layers, the design can maintain terminal-to-terminal electrical connections while creating lateral and vertical pathways for heat dissipation. The heat dissipation plate extends in multiple directions to accommodate thermal management in the additional dimension.
2Temperature
If heat dissipation structure is applied to positive electrode terminals facing each other vertically, then heat dissipation is improved, but gas discharge space is compromised
Solution Approach 1:
Different regions of the battery module are assigned different functions: the heat dissipation plate provides thermal management at terminal locations, while the safety vents provide gas discharge at specific positions. This local differentiation allows heat dissipation and gas discharge to occur simultaneously without interfering with each other, as each function is localized to appropriate areas.
3Reliability
If safety vent is installed at positive electrode terminal for gas discharge, then chain ignition prevention is improved, but heat dissipation path is blocked
Solution Approach 1:
The heat dissipation plate and safety vent structures are merged into an integrated design. The heat dissipation plate extends to create pathways that work in conjunction with the safety vents, allowing both heat dissipation and gas discharge functions to operate together. The merged structure ensures that heat can be dissipated while gas vents remain accessible for pressure relief.
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 effectively dissipates heat and discharges gas generated between cylindrical battery cells with opposing terminals, preventing chain ignition and simplifying electrical connections by creating a structured heat and gas discharge path.
Implementation Method 1
a heatsink made of a material with high thermal conductivity and disposed at a layer boundary between the first cylindrical battery cells and the second cylindrical battery cells
Implementation Method 2
a portion of the heatsink facing the positive electrode terminal is convex toward the positive electrode terminal to form a heat and gas discharge path
Implementation Method 3
a portion of the heatsink facing the positive electrode terminal is convex toward the positive electrode terminal to form a heat and gas discharge path
Implementation Method 4
additional heat transfer pads for enhanced thermal conductivity
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A multilayer battery module includes first cylindrical battery cells arranged standing in lateral and longitudinal directions into a matrix form; second cylindrical battery cells arranged standing on the first cylindrical battery cells with each one of the second cylindrical battery cells in a one-to-one relationship with a corresponding one of the first cylindrical battery cells; and a heatsink of high thermal conductivity between the first and second cylindrical battery cells. The first and second cylindrical battery cells and are disposed so that positive electrode terminals and negative electrode terminals face each other with the heatsink being interposed therebetween. A portion of the heatsink facing each respective positive electrode terminal is recessed to form a heat and gas discharge path, and a portion of the heatsink facing each respective negative electrode terminal contacts the respective negative electrode terminal to form a heat dissipation path.