Metallized Film Battery Module Current Path Design
Solution Overview
Problem
Existing soft pack battery designs using aluminum plastic film packages suffer from suboptimal current path utilization, leading to high transmission loss and heat generation, which compromises the stability and efficiency of the battery cell.
Innovation Solution
A soft pack battery module design that utilizes metallized plastic film packages with inner and outer electrically-conductive areas to form direct electrical connections between battery units, maximizing the current path and eliminating the need for additional wires, while incorporating fire retardants for enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electricity power is guided from the gap of the aluminum plastic film, then the battery cell can be sealed, but the current path cannot be maximized and transmission loss is large
Solution Approach 1:
The patent transitions from guiding electricity through a narrow gap (one-dimensional path) to utilizing the entire inner surface of the metallized plastic film (two-dimensional surface). The inner surface serves as a large-area current collection path, maximizing the current path area and minimizing transmission loss while maintaining battery cell sealing.
2Reliability
If electricity power is guided from the gap of the aluminum plastic film, then the battery cell can be sealed, but heat generation is high and stability is affected
Solution Approach 1:
The patent expands the current path from a narrow gap to the entire inner surface of the metallized plastic film. This increased surface area distributes the current more evenly, reducing current density and consequently reducing Joule heating, which improves battery stability.
3Weight of moving object
If the aluminum plastic film is used for packaging, then light weight and flexible design are achieved, but the current path is limited
Solution Approach 1:
The metallized plastic film performs multiple functions: it provides sealing (packaging function) and simultaneously serves as a large-area current collection path (electrical function). The inner surface of the film is designed to be electrically conductive, allowing it to collect current from the entire battery cell surface, thus maximizing current path area while maintaining light weight and flexibility.
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 enhances current path efficiency, reduces heat generation, and improves the stability and safety of the battery module by optimizing electrical connections and incorporating fire retardants.
Implementation Method 1
The inner electrically-conductive area is electrically connected with the outer electrically-conductive area... The electricity power of the battery cell can be transmitted via the outer electrically-conductive areas of the two sheet to make the current path of the battery cell be maximized
Implementation Method 2
The sheets are adhered to each other via an adhesion layer
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The invention provides a soft pack battery module and its electricity supply thereof. The battery units, which are independent and complete modules, are utilized to be contacted to each other to form the battery cell with the serial connection, the parallel connection or both. There only have charges transferred rather than electrochemical reactions occurred between the battery units. Also, the metallized plastic film package is utilized to pack the battery cell. The inner electrically-conductive area of the metallized plastic film package is directly contacted to the electric power outputs of the battery cell to form electrical connections. Therefore, the problems caused by the need for additional wires can be avoided and the surface area the current path of the battery cell can be maximized.