Bipolar Battery Terminal Configuration for Voltage Measurement
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Solution Overview
Problem
Bipolar batteries face challenges in accurately measuring and balancing voltages across unit cells due to variations in internal resistance and discharge current, leading to reduced lifespan as voltage detection precision is compromised when discharge terminals also handle measurement tasks.
Innovation Solution
A bipolar battery design with separate voltage detection and discharge terminals positioned strategically on the collector's edge, allowing for precise voltage measurement and discharge control, thereby maintaining accurate voltage balance across unit cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the voltage detection terminal is used for discharge, then the discharge function is integrated, but the voltage measurement precision deteriorates due to large discharge current flow
Solution Approach 1:
The patent divides the terminal functions into two separate terminals: a voltage detection terminal for accurate voltage measurement and a discharge terminal for current discharge. This segmentation allows each terminal to be optimized for its specific function, preventing the voltage detection terminal from being affected by large discharge currents and thus maintaining measurement precision.
Solution Approach 2:
The voltage detection function is extracted from the discharge terminal. The patent specifically positions the voltage detection terminal at a location where discharge current does not flow or flows minimally, separating the voltage measurement path from the discharge current path to ensure accurate voltage detection independent of discharge operations.
2Productivity
If the discharge terminal is positioned for optimal discharge current flow, then discharge efficiency is improved, but voltage measurement precision deteriorates due to dramatic voltage variation
Solution Approach 1:
The patent segments the functional locations by positioning the discharge terminal at the peripheral edge portion for optimal discharge current flow, while placing the voltage detection terminal at a distinct location (centroid or specific peripheral position) where voltage remains stable during discharge, thus achieving both high discharge efficiency and accurate voltage measurement.
Solution Approach 2:
Different locations on the collector are assigned different functional qualities: the peripheral edge portion is optimized for discharge current flow, while the centroid or specific peripheral position is optimized for voltage stability. This local quality differentiation ensures that each terminal operates in the most favorable location for its specific function.
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
This design enhances voltage balance control precision, extending the lifespan of bipolar batteries by ensuring accurate voltage measurement and discharge management, even under varying internal resistances and discharge currents.
Implementation Method 1
a plurality of electrolyte layers through which ions move internally are laminated
Implementation Method 2
a positive electrode active material layer disposed on one surface of the collector, and a negative electrode active material layer disposed on another surface of the collector
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A voltage detection terminal (27a-27e, 27aa-27ee, 27aaa-27eee) and a discharge terminal (21a-21e) are connected to a peripheral edge portion of a collector (4a-4e) of a bipolar battery (2). Assuming a first straight line (Da1) that connects a centroid of the collector (4a-4e) and the voltage detection terminal (27a-27e) and a second straight line (Da2) that is orthogonal to the first straight line (Da1), the discharge terminal (21a-21e) is disposed on an opposite side of the second straight line (Da2)-the voltage detection terminal (27a-27e). A requirement relating to measurement of a voltage of the collector (4a-4e) and a requirement relating to discharge are thereby both satisfied.