X-Ray Diffractometry Sample Holder Thermal Management
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Solution Overview
Problem
Existing apparatuses for analyzing battery cells, particularly pouch battery cells, struggle to maintain a specified target temperature during x-ray diffractometry, which is crucial for accurately determining the state of charge, especially in high-power rechargeable batteries, as they often fail to ensure constant temperature conditions due to direct temperature control methods that affect the battery and its housing.
Innovation Solution
The apparatus incorporates at least one inner temperature control device, such as Peltier elements, attached to the sample holder for direct heat transfer and an outer heat dissipation or introduction device, like air or water cooling, to manage heat generated by the battery, ensuring effective thermal management and maintaining settable temperatures for non-destructive analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If direct temperature control methods are used on the battery, then temperature control capability is improved, but temperature stability deteriorates due to thermal interference with the battery and housing
Solution Approach 1:
The temperature control system is segmented into two independent parts: an inner temperature control device attached to the sample holder for direct battery temperature control, and an outer temperature control device attached to the housing for controlling the housing temperature. This segmentation allows each device to operate independently without thermal interference, resolving the contradiction between temperature control capability and temperature stability.
Solution Approach 2:
The sample holder acts as an intermediary between the inner temperature control device and the battery. The inner temperature control device controls the temperature of the sample holder, which in turn controls the battery temperature indirectly, avoiding direct thermal contact that would cause instability. The housing serves as another intermediary that isolates the battery from external thermal influences.
2Manufacturing precision
If inner temperature control device is attached to sample holder, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The inner temperature control device is merged with the sample holder structure, and the outer temperature control device is merged with the housing structure. This integration reduces the number of separate components and simplifies the overall device architecture while maintaining high temperature control precision through the dual-device approach.
Solution Approach 2:
The sample holder serves multiple functions: it holds the battery sample, provides a mounting surface for the inner temperature control device, and acts as a thermal intermediary. The housing serves multiple functions: it encloses the measurement apparatus, provides a mounting surface for the outer temperature control device, and isolates the system from external thermal influences. This multi-functionality reduces overall device complexity.
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 solution allows for precise temperature control of flat samples, including battery cells, enabling high-quality analysis of charging and discharging cycles under real usage conditions, adaptable to commercially available x-ray diffractometers, and suitable for both industry and research applications, with the ability to control temperatures from -40°C to 60°C without cryogens.
Implementation Method 1
at least one first temperature control device, in particular in the form of a Peltier element, for controlling the temperature of the sample
Implementation Method 2
at least one second temperature control device for dissipating heat, which is output by the first temperature control device to the housing, out of the housing to the outside and/or for introducing heat from the outside into the housing
Implementation Method 3
at least two x-ray windows for letting in and out x-rays
Implementation Method 4
holding elements that are able to be tensioned in relation to one another for clamping the sample
Data Source
AI summary
The invention relates to an apparatus (1) for clamping flat samples (6), in particular pouch battery cells, for x-ray diffractometry, wherein the apparatus has a housing (2) having a sample holder (4), which has holding elements (5) that are able to be tensioned in relation to one another for clamping the sample (6), at least two x-ray windows (11a, 11b, 12) for letting in and out x-rays, and at least one first temperature control device (7) for controlling the temperature of the sample (6). At least one first temperature control device (7) is in each case attached to the holding elements (5), wherein the first temperature control devices (7) are thermally coupled to the housing (2), and the apparatus has at least one second temperature control device (9), which is configured to dissipate heat, which is output by the first temperature control device (7) to the housing (2), out of the housing (3) to the outside and/or to introduce heat from the outside into the housing (2).