Pouch Battery Cell Voltage Sensing Without Added Pack Height
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Solution Overview
Problem
Existing pouch-shaped battery cells face challenges in measuring voltages of all cells without increasing volume or reducing capacity, particularly when stacked, due to the need for separate connection members that add height to the battery pack.
Innovation Solution
A pouch-shaped battery cell design with a sensing member integrated into the battery case, featuring sensing leads and wires that protrude from opposite ends, allowing direct electrical connection to both positive and negative electrode leads without additional space, and 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 sensing member is merged with the electrode lead structure, integrating the voltage detection function directly into the existing electrode lead that protrudes from the battery case. This eliminates the need for separate connection members and reduces the overall height requirement.
Solution Approach 2:
The electrode lead serves dual functions: as the current-carrying conductor and as the sensing member for voltage detection. By making the electrode lead multi-functional, the patent eliminates the need for additional dedicated sensing components, thereby reducing height.
2Quantity of substance
If the pouch-shaped battery cell is designed with large length to maximize capacity, then energy density is improved, but additional space is needed for voltage measurement structures
Solution Approach 1:
The sensing function is merged with the electrode lead, utilizing the same structural element for both current conduction and voltage sensing. This integration eliminates the need for additional space-dedicated sensing structures.
Solution Approach 2:
The electrode lead serves its own additional function of voltage sensing without requiring external assistance or separate components. The electrode lead 'self-services' by detecting voltage along its length, eliminating the need for separate sensing infrastructure.
3Adaptability or versatility
If electrode leads protrude in opposite directions from the battery case, then bidirectional connection flexibility is improved, but connection complexity to BMS is increased
Solution Approach 1:
The sensing function is segmented along the length of the electrode lead, with sensing capabilities distributed at different positions. This allows independent sensing at multiple points without requiring complex centralized connection structures.
Solution Approach 2:
The electrode lead itself acts as an intermediary between the internal battery components and the external BMS, performing both current conduction and voltage sensing functions. This eliminates the need for additional intermediary connection members.
Data Source
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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 through 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.