Pouch Battery Cell Sensing Member for Compact Module Voltage Detection
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Solution Overview
Problem
The challenge is to measure the voltages of multiple pouch-shaped battery cells in a battery module without increasing the volume or reducing the capacity of the battery pack, particularly in electric vehicle applications where space is limited and traditional connection methods require additional space and components.
Innovation Solution
A pouch-shaped battery cell design with a built-in sensing member, including a wire and leads that extend from the battery case to connect with a busbar plate, allowing voltage measurement without the need for separate connection members, and incorporating a fuse for safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate connection member is added to connect the BMS to electrode leads protruding in opposite directions, then voltage measurement capability is improved, but the height of the battery pack is increased
Solution Approach 1:
The patent combines the voltage detection function directly into the battery cell structure by integrating a sensing member with the electrode assembly. The sensing member is mounted on the electrode assembly such that its detection end faces the positive electrode and negative electrode, eliminating the need for separate connection members and reducing battery pack height while maintaining voltage measurement capability.
Solution Approach 2:
The sensing member acts as an intermediary between the electrode assembly and the BMS. It is electrically connected to the positive and negative electrodes through the electrode assembly, enabling voltage detection without requiring additional connection structures that would increase the battery pack height.
2Quantity of substance
If the pouch-shaped battery cell is designed with large length to secure capacity, then energy density is improved, but additional space is needed for voltage measurement structures
Solution Approach 1:
The sensing member is integrated directly onto the electrode assembly within the pouch-shaped battery cell structure. This merging of the voltage detection function into the existing cell structure eliminates the need for additional space for separate measurement structures, allowing the battery cell to maintain large length for capacity without volume penalty.
Solution Approach 2:
The electrode assembly serves multiple functions: it provides the electrochemical reaction structure for energy storage and simultaneously serves as the mounting structure for the sensing member, enabling voltage detection. This multi-functionality eliminates the need for dedicated space for measurement structures.
3Adaptability or versatility
If electrode leads protrude in opposite directions for bidirectional battery cells, then electrical connection flexibility is improved, but device complexity is increased
Solution Approach 1:
The patent extracts the voltage detection function from the external connection structure and integrates it directly into the battery cell. The sensing member is mounted on the electrode assembly with its detection end facing the electrodes, eliminating the need for complex external connection structures while maintaining electrical connection flexibility through the existing electrode leads.
Data Source
AI summary
The present invention relates to a pouch-shaped battery cell having an electrode assembly received in a pouch-shaped battery case, wherein the electrode assembly includes a plurality of positive electrodes and a plurality of negative electrodes, positive electrode tabs and negative electrode tabs extend in opposite directions respectively from opposite ends of the electrode assembly in an overall length direction, a positive electrode lead coupled to the positive electrode tabs and a negative electrode lead coupled to the negative electrode tabs protrude outwards from the pouch-shaped battery case via a sealed portion of the pouch-shaped battery case, and the pouch-shaped battery case has a sensing member configured to detect voltage mounted therein.