Lithium-Ion Energy Store Segmented Electrode for State of Charge Detection
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Solution Overview
Problem
Existing lithium ion energy storage devices face challenges in accurately determining the depth of discharge and state of charge without risking short circuits or requiring additional sensors, as existing methods either disrupt the ion flow or rely on complex theoretical models.
Innovation Solution
The device is divided into a main cell and a smaller measuring cell, with the measuring cell allowing for separate charging or discharging to determine depth of discharge and state of charge, using a current source, voltage ascertaining device, and time measuring device to scale characteristics from the measuring cell to the main cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference electrode is embedded in the separator to form a reference cell, then information regarding the state of the energy storage device can be obtained, but the ion flow is disrupted and there is a risk of short circuit between electrodes
Solution Approach 1:
The electrode is divided into a main section and a measuring section that are electrically separate from one another. The measuring section forms a measuring cell with the mating electrode measuring section, while the main section forms the main cell. This segmentation allows the measuring cell to be used for state of charge determination without affecting the reliability of the main cell.
Solution Approach 2:
The measuring function is extracted from the main cell by creating a separate measuring cell with a dedicated measuring section. This extraction allows the measuring operations to be performed independently without risking the main cell's integrity or disrupting the primary ion flow path.
2Measurement precision
If additional sensors are used to measure current and characteristics, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The measuring cell serves multiple functions: it determines state of charge, depth of discharge, and provides information about the main cell's condition. By making the measuring cell multi-functional, additional measurement capabilities are achieved without requiring separate sensors for each parameter.
Solution Approach 2:
The measuring cell is self-sufficient for measurement purposes, using its own electrode sections and separator to generate measurement data. This self-service capability eliminates the need for external sensors and complex measurement systems.
3Reliability
If the measuring section is made smaller than the main section, then the risk of short circuit is reduced, but the measurement representativeness may be compromised
Solution Approach 1:
The characteristics of the measuring cell (such as capacity and surface area) are scaled relative to the main cell using a scaling factor. This parameter change allows the smaller measuring cell to provide accurate measurements that are mathematically related to the main cell's state, maintaining measurement precision despite the size difference.
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 approach enables accurate determination of the depth of discharge and state of charge without affecting the main cell, allowing for independent operation and precise monitoring while minimizing the risk of short circuits and eliminating the need for additional sensors.
Implementation Method 1
the separator is saturated between the electrodes with an ion-transporting means that renders it possible for the ions to pass through the separator
Implementation Method 2
Lithium ion energy storage devices have a high cell voltage and a good ratio between stored energy and weight
Data Source
AI summary
The invention relates to a lithium-ion energy store (1), comprising an electrode (2, 3) having a main segment (2) and having a measurement segment (3) electrically isolated from the main segment (2), a counter-electrode (4), and a separator (5) between the electrode (2, 3) and the counter-electrode (4), wherein a measuring cell (3, 4), which forms part of the lithium-ion energy store (1), comprises the measuring segment (3) of the electrode (2, 3), a counter-electrode measuring segment, which is opposite the measuring segment (3) of the electrode (2, 3) with respect to the separator (5), and a segment of the separator (5) in arranged between the measuring segment (3) of the electrode (2, 3) and the counter-electrode measuring segment, and a main cell (2, 4), which forms part of the lithium-ion energy store (1), comprises the main segment (2) of the electrode (2, 3), a counter-electrode in main segment, which is opposite the main segment (2) of the electrode (2, 3) with respect to the separator (5), and a segment of the separator (5) arranged between the main segment (2) of the electrode (2, 3) and the counter-electrode main segment, wherein the lithium-ion energy store (1) has a measuring device (110) for a depth of discharge and/or a state of charge of the measuring cell (3, 4).