Battery Module Connection Terminal Design for Accurate Voltage Detection
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Solution Overview
Problem
In battery packs, accurately detecting the voltage of multiple battery cells is challenging due to measurement errors caused by resistance differences in connection terminal portions.
Innovation Solution
A battery module design featuring a connection terminal portion with a coupling portion that couples adjacent battery columns and an extension portion positioned to minimize resistance differences, ensuring accurate voltage measurement across battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional connection terminal portion is used to couple battery columns, then the battery pack structure is simple, but the voltage detection accuracy deteriorates due to resistance differences
Solution Approach 1:
The connection terminal portion is segmented into multiple functional regions: a coupling portion for connecting battery columns and an extension portion for voltage detection. This segmentation allows the voltage detection function to be separated from the current conduction function, enabling accurate voltage measurement by providing a dedicated detection path that is electrically isolated from the high-current coupling paths.
Solution Approach 2:
The extension portion acts as an intermediary element between the coupling portion and the voltage detection point. It provides a separate electrical pathway that mediates the voltage detection process, allowing the detection terminal to access the battery column voltage without being influenced by the resistance variations in the main current-carrying coupling portions.
2Measurement precision
If the connection terminal portion is extended to improve voltage detection, then measurement accuracy improves, but the terminal portion becomes more complex
Solution Approach 1:
The extension portion is merged with the coupling portion to form an integrated connection terminal structure. This merging allows the voltage detection function to be incorporated into the existing connection terminal without requiring completely separate components, thus improving measurement accuracy while minimizing the increase in overall structural complexity.
Data Source
AI summary
A battery module, a power storage device, a power storage system, an electronic appliance, an electric vehicle, and a power system that can detect the voltage of a plurality of battery cells more accurately are provided. The power storage device includes a connection terminal portion which is coupled with terminal planes of a plurality of battery cells constituting battery columns. The connection terminal portion includes a coupling portion including a first coupling portion configured to couple at least with a first battery column and a second coupling portion configured to couple at least with a second battery column adjacent to the first battery column, and an extension portion extended from an end of the coupling portion in a longitudinal direction. The extension portion is provided at a predetermined position.