Method and apparatus for heat transfer in a cylindrical battery cell
An electrochemical battery cell includes a plurality of first electrodes, a plurality of second electrodes, a plurality of layers interleaved between and stacked in an electrode stack along a central stack axis with the first and second electrodes, a first current collector, and a second current collector. The second current collector includes an elongated cylinder and a fluidic coupler, the second current collector extends axially through the central stack cavity, and the second current collector includes a flow channel extending longitudinally between a first end and a second end.
1 . An electrochemical battery cell, comprising:
a plurality of first electrodes each having a first active electrode material borne by a first body and a flexible first electrode tab projecting from the first body;
a plurality of second electrodes each having a second active electrode material borne by a second body and a flexible second electrode tab projecting from the second body; and
a plurality of separators; wherein the plurality of first electrodes, the plurality of second electrodes, and the plurality of separators are stacked in an electrode stack along a central stack axis
wherein the plurality of first electrodes, the plurality of second electrodes, and the plurality of separators define a central stack cavity;
a first current collector; and
a second current collector;
wherein the second current collector includes an elongated cylinder and a fluidic coupler;
wherein the second current collector extends axially through the central stack cavity;
wherein the second current collector is disposed inside the first current collector is aligned in parallel with the central stack axis, and has an interference fit with the second electrode tabs to electrically connect to the second electrodes; and
wherein the second current collector includes a flow channel extending longitudinally between a first end and a second end.
2 . The electrochemical battery cell of claim 1 , further comprising a fluidic coupler arranged at the first end and fluidly coupled to the flow channel of the second current collector.
3 . The electrochemical battery cell of claim 2 , wherein the flow channel comprises a circuit extending longitudinally between the first end and the second end and having an inlet and an outlet; and wherein the fluidic coupler includes a first port fluidly coupled to the inlet and a second port fluidly coupled to the outlet.
4 . The electrochemical battery cell of claim 2 , wherein the flow channel comprises a single channel extending longitudinally between the first end and the second end; and wherein the fluidic coupler is fluidly coupled to the single channel.
5 . The electrochemical battery cell of claim 1 , wherein the second current collector includes an outer portion fabricated from an electrically conductive material.
6 . The electrochemical battery cell of claim 1 , wherein the first current collector encases the electrode stack and interference fits with the first electrode tabs to thereby electrically connect to the first electrodes.
7 . The electrochemical battery cell of claim 1 , wherein the first and second bodies of the first and second electrodes each has a substantially flat annular shape.
8 . The electrochemical battery cell of claim 7 , wherein the first and second bodies have respective central holes coaxially aligned on the central stack axis to define the central stack cavity extending through the electrode stack, and wherein the second current collector includes an elongated electrically conductive bar extending axially through the central stack cavity.
9 . The electrochemical battery cell of claim 8 , wherein each of the second electrode tabs includes a plurality of second electrode tabs projecting radially inward from an inner-diameter (ID) edge of the second body, circumferentially spaced around the second body, and bent against an outer surface of the electrically conductive bar of the second current collector.
10 . The electrochemical battery cell of claim 9 , wherein the second body of each of the second electrodes has an outer-diameter (OD) edge with a second layer of electrical insulation.
11 . The electrochemical battery cell of claim 1 , wherein the first current collector includes an electrically conductive cylinder concentric with and surrounding the first and second electrodes.
12 . The electrochemical battery cell of claim 11 , wherein each of the first electrode tabs includes a plurality of first electrode tabs projecting radially outward from an outer-diameter (OD) periphery of the first body, circumferentially spaced around the first body, and bent against an inner surface of the electrically conductive cylinder of the first current collector.
13 . The electrochemical battery cell of claim 12 , wherein the first body of each of the first electrodes has an inner-diameter (ID) edge with a first layer of electrical insulation.
14 . The electrochemical battery cell of claim 1 , further comprising a rigid outer housing containing therein the electrode stack and the first and second current collectors.
15 . The electrochemical battery cell of claim 14 , wherein the outer housing includes a main housing, a housing cap closing off an open end of the main housing, and a biasing member compressed between the electrode stack and the housing cap or the main housing.
16 . The electrochemical battery cell of claim 1 , wherein the second current collector includes an electrically conductive plate extending longitudinally along a lateral side of the electrode stack, abutting the second electrodes, and spaced in relation to the first electrodes.
17 . The electrochemical battery cell of claim 1 , wherein the first current collector includes an electrically conductive hollow container coaxial with and surrounding the first and second electrodes.
18 . An electrochemical battery cell, comprising:
a plurality of first electrodes;
a plurality of second electrodes having a plurality of second electrode tabs;
a plurality of layers interleaved between and stacked in an electrode stack along a central stack axis with the first and second electrodes, wherein the plurality of layers form a central stack cavity;
a first current collector; and
a second current collector;
wherein the second current collector includes an elongated cylinder and a fluidic coupler;
wherein the second current collector extends axially through the central stack cavity;
wherein the second current collector is disposed inside the first current collector, is aligned parallel with the central stack axis, and has an interference fit with the plurality of second electrode tabs to electrically connect to the plurality of second electrodes; and
wherein the second current collector includes a flow channel extending longitudinally between a first end and a second end.
19 . The electrochemical battery cell of claim 18 , further comprising a fluidic coupler arranged at the first end and fluidly coupled to the flow channel of the second current collector;
wherein the flow channel comprises a circuit extending longitudinally between the first end and the second end and having an inlet and an outlet; and
wherein the fluidic coupler includes a first port fluidly coupled to the inlet and a second port fluidly coupled to the outlet.