Controlling temperature of individual electrochemical cell during testing
An apparatus comprises: a clamshell configured for holding an electrochemical cell having first and second terminals, the clamshell comprising at least first and second portions hinged to each other; first and second contacts positioned for contacting the first and second terminals, respectively; and a thermoelectric device mounted to the clamshell for controlling a temperature of the electrochemical cell.
1 . A system comprising:
a frame having an interior channel for coolant; and
an apparatus mounted to the frame, the apparatus comprising:
a clamshell configured for holding an electrochemical cell having first and second terminals, the clamshell comprising at least first and second portions hinged to each other;
first and second contacts positioned for contacting the first and second terminals, respectively;
a thermoelectric device mounted to the clamshell for controlling a temperature of the electrochemical cell;
a fitting mounted to the frame that facilitates flow into or out of the frame, the fitting including a coolant path member configured to fit inside an O-ring fitting; and
a positive thermal coefficient device positioned to detect temperature inside at least one of the first and second portions of the clamshell, wherein the positive thermal coefficient device is configured for detecting a safety cutoff temperature of the electrochemical cell.
2 . The system of claim 1 , further comprising a thermal pad positioned between the apparatus and the frame.
3 . The system of claim 1 , where the frame comprises an extrusion with an interior channel.
4 . The system of claim 3 , wherein at least one fin faces inward in the interior channel.
5 . The system of claim 3 , wherein the thermoelectric device is positioned between and abuts the clamshell and the extrusion.
6 . The system of claim 3 , wherein the frame further comprises an upright, wherein the extrusion is coupled to the upright, and wherein a coolant passage is formed between the extrusion and the upright, the coolant passage facilitating flow of coolant into and out of the interior channel of the extrusion.
7 . The system of claim 1 , wherein a form factor of the electrochemical cell is a cylinder shape or a prismatic shape.
8 . The system of claim 1 , wherein the thermoelectric device is configured for operating according to Peltier effect.
9 . The system of claim 1 , wherein at least one of the first and second contacts includes a spring-loaded pin, the spring-loaded pin configured to be moveable relative to a remainder of the one of the first and second contacts for electrically contacting a terminal of the electrochemical cell.
10 . The system of claim 1 , wherein at least one of the first and second contacts is spring mounted relative to the electrochemical cell such that the one of the first and second contacts is moveable relative to the electrochemical cell.
11 . The system of claim 10 , wherein both the first and second contacts are spring mounted relative to the electrochemical cell.
12 . The system of claim 1 , further comprising a thermal pad of a dielectric material inside the clamshell, the thermal pad facing the electrochemical cell.
13 . The system of claim 12 , further comprising a polymer film on a surface of the thermal pad, the polymer film positioned so that the electrochemical cell touches the polymer film, and does not touch the thermal pad, when positioned inside the clamshell.
14 . The system of claim 1 , further comprising a latch on the clamshell, the latch configured for selectively keeping the first and second portions of the clamshell in a closed position.
15 . The system of claim 1 , wherein the positive thermal coefficient device is further configured for detecting a testing temperature of the electrochemical cell.
16 . The system of claim 1 , wherein the coolant path member has a threaded hole.
17 . The system of claim 1 , wherein the O-ring fitting includes a passage for flow of coolant.
18 . The system of claim 1 , wherein the positive thermal coefficient device is configured to trigger a shutdown of testing equipment if the temperature of the electrochemical cell becomes too high.