Electrochemical Cell Testing With Peltier Temperature Control
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Solution Overview
Problem
Existing methods for testing electrochemical cells, such as those used in battery packs for electric vehicles, struggle to distinguish between performance characteristics due to charge/discharge current and temperature changes, and fail to control temperature conditions uniformly along the cell length.
Innovation Solution
An apparatus and system using Peltier modules and heat sinks to maintain a controlled temperature condition, with a cell-contacting member and heat sink members to manage heat transfer, and a controller to regulate power supply for precise temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a thermal chamber is used to test electrochemical cells, then the cell can be subjected to controlled charge and discharge currents, but the cell temperature cannot be controlled uniformly and temperature variations interfere with performance measurements
Solution Approach 1:
The thermal chamber is divided into multiple independently controlled heating zones along the cell length, allowing different temperature conditions to be applied to different sections of the cell. This segmentation enables uniform temperature control or controlled temperature gradients while maintaining the ability to subject the cell to charge/discharge currents for performance testing.
Solution Approach 2:
Temperature sensors are placed at multiple positions along the cell to provide real-time temperature feedback. This feedback is used by the control system to adjust the heating power in each zone, maintaining the desired temperature profile (isothermal or gradient) during charge/discharge testing, thereby eliminating temperature interference with performance measurements.
2Stability of the object's composition
If the entire cell surface is contacted for heat transfer, then uniform temperature control is achieved, but the device complexity increases
Solution Approach 1:
Instead of requiring contact with the entire cell surface, the invention uses a limited number of strategically placed heating elements that contact specific portions of the cell. This partial action is sufficient to achieve uniform temperature control or controlled gradients, reducing device complexity while maintaining thermal stability.
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 accurate testing of electrochemical cells by maintaining isothermal conditions or controlled temperature gradients, separating performance effects from temperature variations.
Implementation Method 1
at least one Peltier module comprising a cold side and a hot side, wherein the cold side is in contact with the cell-contacting member
Implementation Method 2
at least one heat sink member in contact with the hot side of the at least one Peltier module
Data Source
AI summary
An apparatus is provided for testing an electrochemical cell under a controlled temperature condition. The apparatus comprises: a pair of terminals positioned to contact a pair of cell terminals; a cell-contacting member comprising a cell-contacting surface shaped to contact at least part of a cell casing when the pair of cell terminals contact the pair of terminals; a Peltier module comprising a cold side an a hot side, wherein the cold side is in contact with the cell-contacting member; and a heat sink member in contact with the hot side of the Peltier module. A system comprises the apparatus operatively connected to an electrical power supply, and a controller programmed to control a supply of electrical power from the electrical power supply to the Peltier module of the apparatus.