Battery pack design for high temperature and shock and vibration applications
View Patent ↗Various embodiments of an electrochemical cell interconnect assembly are described. The interconnect assembly is designed to be positioned between two adjacent electrochemical cells, providing an electrical conduit therebetween. The interconnect assembly consists of an interconnect body having a curved formed and an interwoven wire structure. The interconnect assembly is designed to provide a robust electrical connection between two adjacent electrochemical cells in extreme mechanical stress and temperature environments.
1. A modular battery assembly, comprising:
a) a first electrochemical cell, comprising:
i) a first casing enclosing a first anode in electrochemical association with a first cathode,
ii) wherein the first casing has a casing reservoir having a reservoir surrounding edge residing along an imaginary reservoir plane;
b) a first terminal pin electrically connected to one of the first anode and the first cathode to thereby serve as a first cell first terminal, wherein the first terminal pin is electrically isolated from the first casing and comprises a first terminal pin distal portion extending outside the first casing, but residing in the casing reservoir, spaced inwardly from the imaginary reservoir plane;
c) an interconnect assembly, comprising:
i) a flexible interconnect extending from an interconnect proximal portion to an interconnect distal portion;
ii) a proximal electrically conductive contact plate connected to the interconnect proximal portion in a first connection; and
iii) a distal electrically conductive contact plate connected to the interconnect distal portion,
d) wherein the proximal contact plate is physically connected to the first terminal pin distal portion in a second connection, and wherein the first and second connections reside in the casing reservoir, spaced inwardly from the imaginary reservoir plane;
e) an encapsulate material residing in the casing reservoir and encapsulating the first and second connections of the proximal contact plate to the respective interconnect proximal portion and the first terminal pin distal portion, wherein the encapsulate material does not encapsulate the distal contact plate; and
f) a second electrochemical cell, comprising:
i) a second casing enclosing a second anode in electrochemical association with a second cathode;
ii) a second terminal pin electrically connected to one of the second anode and the second cathode to thereby serve as a second cell first terminal, wherein the second cell first terminal is electrically isolated from the second casing and is of the same polarity as the first terminal pin serving as the first cell first terminal,
iii) wherein the second casing is connected to the other of the second anode and the second cathode not electrically connected to the second terminal pin to thereby serve as a second cell second terminal having a polarity that is opposite that of the second terminal pin, and
iv) wherein the distal contact plate connected to the interconnect distal portion is directly contacted to the second casing of the second electrochemical cell so that the first and second electrochemical cells are electrically connected in series, and
v) wherein the flexibility of the interconnect of the interconnect assembly is configured so that the first and second electrochemical cells to move with respect to each under mechanical shock and vibration conditions.
2. The modular battery assembly of claim 1 , wherein the encapsulate material is a resin epoxy.
3. The modular battery assembly of claim 2 , wherein the resin epoxy is thermally conductive.
4. The modular battery assembly of claim 1 , wherein proximal contact plate comprises spaced apart first and second sides, and wherein the first terminal pin distal portion is connected to the proximal contact plate first side opposite the proximal contact plate second side connected to the interconnect proximal portion.
5. The modular battery assembly of claim 1 , wherein the first terminal pin is supported in a glass-to-metal seal, and wherein the glass-to-metal seal is supported in a lid for the first casing of the first electrochemical cell.
6. The modular battery assembly of claim 5 , wherein the lid comprises a lid sidewall providing the reservoir.
7. The modular battery assembly of claim 6 , wherein the interconnect comprises a plurality of interwoven wire strands.
8. The modular battery assembly of claim 1 , wherein the encapsulate material does not encapsulate the interconnect distal portion.
9. The modular battery assembly of claim 1 , wherein the distal contact plate comprises opposed third and fourth sides, and wherein the interconnect distal portion is connected to the distal contact plate third side and the distal contact plate fourth side is directly contacted to the second casing serving as the second cell second terminal.
10. The modular battery assembly of claim 1 , wherein the interconnect comprises a first wire strand, a second wire strand and a third wire strand, and wherein the second wire strand crosses over in front of the third wire strand at a first crossing point and the third wire strand crosses over in front of the second strand at a second crossing point spaced from the first crossing point, and wherein the first wire strand passes alternatively under and over the first and second crossing points.
11. The modular battery assembly of claim 1 , wherein the distal contact plate comprises at least one planar side that is directly contacted to a planar surface of the second casing serving as the second cell second terminal.
12. A modular battery assembly, comprising:
a) a first electrochemical cell, comprising:
i) a first casing enclosing a first anode in electrochemical association with a first cathode; and
ii) wherein the first casing has an upwardly extending sidewall providing a casing reservoir having a reservoir surrounding edge residing along an imaginary reservoir plane;
b) a first terminal pin electrically connected to one of the first anode and the first cathode to thereby serve as a first cell first terminal, wherein the first terminal pin is electrically isolated from the first casing and comprises a first terminal pin distal portion extending outside the first casing, bur residing in the casing reservoir, spaced inwardly from the imaginary reservoir plane;
c) an interconnect assembly, comprising:
i) a flexible interconnect comprising a plurality of interwoven wire strands extending from an interconnect proximal portion to an interconnect distal portion;
ii) a proximal electrically conductive contact plate connected to the interconnect proximal portion in a first connection; and
iii) a distal electrically conductive contact plate connected to the interconnect distal portion; and
d) wherein the proximal contact plate is connected to the first terminal pin distal portion in a second connection, and wherein the first and second connections reside in the casing reservoir, spaced inwardly from the imaginary reservoir plane;
e) an encapsulate material residing in the casing reservoir and encapsulating the first and second connections of the proximal contact plate to the respective interconnect proximal portion and the first terminal pin distal portion, wherein the encapsulate material does not encapsulate the distal contact plate; and
f) a second electrochemical cell, comprising:
i) a second casing enclosing a second anode in electrochemical association with a second cathode;
ii) a second terminal pin electrically connected to one of the second anode and the second cathode to thereby serve as a second cell first terminal, wherein the second cell first terminal is electrically isolated from the second casing and is of the same polarity as the first terminal pin serving as the first cell first terminal,
iii) wherein the second casing is connected to the other of the second anode and the second cathode not electrically connected to the second terminal pin to thereby serve as a second cell second terminal having a polarity that is opposite that of the second terminal pin, and
iv) wherein the distal contact plate connected to the interconnect distal portion is directly contacted to the second casing of the second electrochemical cell so that the first and second electrochemical cells are electrically connected in series, and
v) wherein the flexibility of the interconnect of the interconnect assembly is configured so that the first and second electrochemical cells move with respect to each under mechanical shock and vibration conditions.
13. The modular battery assembly of claim 12 , wherein the distal contact plate comprises at least one planar side that is directly contacted to the second casing serving as the second cell second terminal.
14. The modular battery assembly of claim 12 , wherein the encapsulate material is a resin epoxy.
15. The modular battery assembly of claim 14 , wherein the resin epoxy is thermally conductive.
16. The modular battery assembly of claim 12 , wherein proximal contact plate comprises spaced apart first and second sides, and wherein the first terminal pin distal portion is connected to the proximal contact plate first side opposite the proximal contact plate second side connected to the interconnect proximal portion.
17. The modular battery assembly of claim 12 , wherein the first terminal pin is supported in a glass-to-metal seal, and wherein the glass-to-metal seal is supported in a lid for the first casing of the first electrochemical cell.
18. The modular battery assembly of claim 17 , wherein the lid comprises a lid sidewall providing the reservoir.
19. A modular battery assembly, comprising:
a) a first electrochemical cell, comprising:
i) a first casing enclosing a first anode in electrochemical association with a first cathode,
ii) wherein the first casing has a casing reservoir having a reservoir surrounding edge residing along an imaginary reservoir plane;
b) a first terminal pin electrically connected to the first cathode to thereby serve as a first cell positive terminal, wherein the first terminal pin is electrically isolated from the first casing and comprises a first terminal pin distal portion extending outside the first casing, but residing in the casing reservoir, spaced inwardly from the imaginary reservoir plane;
c) an interconnect assembly, comprising:
i) a flexible interconnect extending from an interconnect proximal portion to an interconnect distal portion;
ii) a proximal electrically conductive contact plate connected to the interconnect proximal portion in a first connection; and
iii) a distal electrically conductive contact plate connected to the interconnect distal portion,
d) wherein the proximal contact plate is physically connected to the first terminal pin distal portion in a second connection, and wherein the first and second connections reside in the casing reservoir, spaced inwardly from the imaginary reservoir plane;
e) an encapsulate material residing in the casing reservoir and encapsulating the first and second connections of the proximal contact plate to the respective interconnect proximal portion and the first terminal pin distal portion, wherein the encapsulate material does not encapsulate the distal contact plate; and
f) a second electrochemical cell, comprising:
i) a second casing enclosing a second anode in electrochemical association with a second cathode;
ii) a second terminal pin electrically connected to the second cathode to thereby serve as a second cell positive terminal, wherein the second cell positive terminal is electrically isolated from the second casing,
iii) wherein the second casing serves as a second cell negative terminal, and
iv) wherein the distal contact plate comprises at least one planar side that is directly contacted to a planar surface of the second casing of the second electrochemical cell so that the first and second electrochemical cells are electrically connected in series, and
v) wherein the flexibility of the interconnect of the interconnect assembly is configured so that the first and second electrochemical cells to move with respect to each under mechanical shock and vibration conditions.