Pouch Cell Battery Pack Venting and Airflow for Faster Charging
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Solution Overview
Problem
Existing battery packs face challenges in efficiently managing heat dissipation and charging cycles, leading to overheating and prolonged charging times, particularly due to inadequate airflow and venting designs.
Innovation Solution
The battery pack design incorporates a housing with integrated air inlets and outlets, a core box with a resilient layer between pouch cells, and a circuit module with a thermistor and voltage tap, ensuring effective airflow and temperature monitoring, while the pouch cells are connected in a serpentine pattern for enhanced electrical pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If pouch cells are arranged in a traditional configuration, then the battery pack structure is simple, but heat dissipation is inadequate leading to overheating
Solution Approach 1:
The battery pack is divided into modular components: a core box containing pouch cells arranged in a specific configuration, a housing with integrated airflow channels, and a circuit board with monitoring components. This segmentation allows each component to be optimized for its specific function, particularly heat management through the housing's airflow paths
Solution Approach 2:
The patent introduces airflow management as a third dimension of design beyond just cell arrangement and electrical connections. The housing incorporates three-dimensional airflow channels that enable cooling air to pass through the battery pack, addressing heat dissipation by adding a thermal management dimension to the traditional two-dimensional cell layout
2Productivity
If traditional venting design is used, then manufacturing is simple, but charging cycles are prolonged due to inadequate airflow
Solution Approach 1:
The housing is designed to combine multiple functions: structural enclosure, airflow management, and thermal regulation. The integrated housing merges the venting system with the overall battery pack structure, eliminating the need for separate venting components while improving charging efficiency through optimized airflow paths
Solution Approach 2:
The patent applies pneumatic principles by incorporating airflow channels that allow cooling air to move through the battery pack. The housing includes inlet and outlet openings that create a forced convection flow, using air movement to enhance heat dissipation during charging cycles and reduce overall charging time
3Reliability
If cell tabs are not extended through slots, then assembly is simple, but electrical connection reliability is reduced
Solution Approach 1:
The end plate is designed with pre-formed slots that align with the cell tabs during assembly. This preliminary preparation of the connection path ensures that cell tabs can be easily inserted and secured, improving both electrical connection reliability and assembly ease through pre-planned alignment features
Solution Approach 2:
The end plate acts as an intermediary component between the pouch cells and the circuit board. It provides a structured interface with slots that guide and secure the cell tabs, ensuring reliable electrical connection while simplifying the assembly process through this mediating structure
Data Source
AI summary
A battery pack has a housing, a core box, a stack of pouch cells, an end plate, battery pack terminals, and a circuit board. The core box is disposed in the housing and has a support surface. The stack of pouch cells are supported by the support surface. Each pouch cell has cell tabs that extend from a common side of the pouch cell. The end plate has slots, and the cell tabs extend through the slots. The battery pack terminals are electrically connected to the stack of pouch cells and can be electrically connected to an electrical device. The circuit board is coupled to the core box opposite the support surface. The circuit board is electrically connected to the stack of pouch cells and the battery pack terminals. The core box, the end plate, and the circuit board cooperate to enclose the stack of pouch cells.