Magnetic Force Dilatometer for Independent Electrode Dilation
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Solution Overview
Problem
Existing battery technologies lack accurate methods to measure the independent dilation of individual electrodes within battery cells, which is crucial for understanding electrode expansion, preventing dry out, improving battery life, and designing battery modules and packs.
Innovation Solution
A magnetic force dilatometer (MFD) that measures battery cell dilation by using an internal magnetic sensing element and a magnetic force sensor to detect changes in magnetic force strength between the sensing element and an external magnet, allowing independent measurement of one electrode's dilation relative to the other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional dilation measurement methods are used for battery cells, then overall cell dilation can be measured, but independent dilation of individual electrodes cannot be measured
Solution Approach 1:
The measurement system is segmented into two independent measurement channels: one for measuring overall cell dilation and another for measuring magnetic sensing element displacement. This segmentation allows independent electrode dilation to be calculated by subtracting the overall cell dilation from the magnetic sensing element displacement, thereby achieving precise individual electrode measurement without requiring a completely complex new system architecture.
Solution Approach 2:
A magnetic sensing element is introduced as an intermediary component between the first electrode and the second electrode. This magnetic sensing element serves as a mediator that translates physical electrode displacement into measurable magnetic field changes, enabling non-contact, high-precision measurement of the first electrode's independent dilation without directly interfering with the battery cell structure or operation.
2Measurement precision
If magnetic sensing element is placed between electrodes, then individual electrode dilation can be measured, but ion transport between electrodes may be blocked
Solution Approach 1:
The magnetic sensing element is constructed using porous materials that allow ion and electrolyte transport through its structure. The porosity is carefully designed to maintain mechanical stability for accurate magnetic sensing while ensuring sufficient pore connectivity and size for reliable ion transport between electrodes, thus preventing any blockage of the electrochemical reactions.
Solution Approach 2:
The magnetic sensing element utilizes composite materials that combine magnetic properties with ion-conductive characteristics. This composite structure enables the element to simultaneously function as a magnetic sensor for precise dilation measurement and as a permeable barrier that maintains ion transport pathways, resolving the contradiction between measurement precision and transport reliability.
3Ease of operation
If magnetic force sensor is used to detect changes in magnetic force strength, then non-contact measurement is achieved, but sensitivity to external magnetic interference increases
Solution Approach 1:
The measurement system dynamically tracks changes in magnetic force strength rather than relying on absolute magnetic field values. By measuring the dynamic response of the magnetic sensing element to electrode displacement and using differential measurement techniques, the system can distinguish between genuine electrode dilation signals and static or slowly varying external magnetic interference, maintaining non-contact measurement capability while reducing sensitivity to external magnetic factors.
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
Enables precise measurement of individual electrode dilation, enhancing understanding of battery cell behavior and facilitating advancements in battery technology by providing data for improved design and performance.
Implementation Method 1
an internal magnetic sensing element and a magnetic force sensor to detect changes in magnetic force strength between the sensing element and an external magnet
Data Source
AI summary
A dilatometer for measuring battery dilation including: a battery cell with a first electrode and a second electrode; an internal magnetic sensing element; and a magnetic force sensor. The internal magnetic sensing element is configured to move in response to expansion the first electrode and remain stationary in response to expansion of the second electrode during dilation of the battery cell. The magnetic force sensor is stationary relative to the battery cell and configured to sense a change in magnetic force strength between the internal magnetic sensing element and the magnetic force sensor. A controller is configured to measure dilation of the first electrode independent of dilation of the second electrode based on the change in the magnetic force strength between the internal magnetic sensing element and the magnetic force sensor.