DESIGN OF A LARGE LOW MAINTENANCE BATTERY PACK FOR A HYBRID LOCOMOTIVE

• US 20070144804A1
• Filed: 10/19/2006
• Published: 06/28/2007
• Est. Priority Date: 10/19/2005
• Status: Active Grant

• Current Assignee: Mi-Jack Canada, Inc. (Lanco International, Inc.)
• Original Assignee: Railpower Technologies Corp.
• Inventors: Pike, James, Jarrett, Brian
• Granted Patent: US 7,661,370 B2
• Time in Patent Office: Days
• US Class Current: 180/170
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 50/64 Constructional details of batteries specially adapted for electric vehicles
• CPC Class Codes: B60L 58/26 by cooling
• CPC Class Codes: H01M 10/0413 Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• CPC Class Codes: H01M 10/4207 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/615 Heating or keeping warm
• CPC Class Codes: H01M 10/617 for achieving uniformity or desired distribution of temperature
• CPC Class Codes: H01M 10/625 Vehicles
• CPC Class Codes: H01M 10/63 Control systems charging or discharging in response to temperature H01M10/44 , H01M10/443; measurement of temperature H01M10/48 , H01M10/486
• CPC Class Codes: H01M 10/647 Prismatic or flat cells, e.g. pouch cells
• CPC Class Codes: H01M 10/6551 Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
• CPC Class Codes: H01M 10/6562 with free flow by convection only
• CPC Class Codes: H01M 10/6563 with forced flow, e.g. by blowers
• CPC Class Codes: H01M 10/6566 Means within the gas flow to guide the flow around one or more cells, e.g. manifolds, baffles or other barriers H01M10/6565 takes precedence
• CPC Class Codes: H01M 10/658 by thermal insulation or shielding
• CPC Class Codes: H01M 50/204 Racks, modules or packs for multiple batteries or multiple cells
• CPC Class Codes: H01M 50/242 adapted for protecting batteries against vibrations, collision impact or swelling
• CPC Class Codes: H01M 50/249 specially adapted for aircraft or vehicles, e.g. cars or trains constructional details of batteries specially adapted for electric vehicles B60L50/64
• CPC Class Codes: H01M 50/293 characterised by the material
• CPC Class Codes: H01M 50/579 : in response to shock
• CPC Class Codes: H01M 6/42 : Grouping of primary cells into batteries H01M6/40 takes precedence
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries

Abstract

The present invention is directed to systems for prolonging battery life, such as maintaining battery cell temperatures in battery packs within specified limits, providing vibration and shock resistance, and/or electrically isolating groups of batteries from nearby conductive surfaces.

Claims

1. A hybrid vehicle, comprising:

(a) a prime mover for generating electrical energy;

(b) a battery pack for receiving, storing, and providing, as needed, the electrical energy, the battery pack comprising a plurality of battery cells; and

(c) at least one motor for consuming the electrical energy, wherein the vehicle comprises at least one of the following;

(c1) a hood assembly, the hood assembly comprising a chimney vent and hood and wall members respectively defining upper and lower plenums, the upper and lower plenums being in fluid communication with the chimney vent and separated by the wall member, the wall member inhibiting airflow between the upper and lower plenums, and the lower plenum being in fluid communication with and removing heated air from the battery pack, wherein heated air in the upper and/or lower plenums passes, by free convection, through the chimney vent and into the external environment;

(c2) a plurality of airflow channels in communication with the lower plenum, a first set of airflow channels being positioned between adjacent battery cells and a second set of airflow channels being positioned between battery cells and the wall member, the airflow channels in the first set having a first cross-sectional area normal to the direction of airflow and the airflow channels in the second set having a second cross-sectional area normal to the direction of airflow, and wherein the first cross-sectional area is greater than the second cross-sectional area;

(c3) a rack structure, the rack structure comprising a plurality of vertical and horizontal fire wall members defining a plurality of containment sections, each section receiving a corresponding set of battery cells, whereby a fire in one section is retarded from spreading to an adjacent section;

(c4) a fan positioned in a fan duct, the fan duct being in communication with the chimney vent, wherein, when the battery pack is less than a first temperature, the fan is disabled and removal of heated air from the battery pack is done by free convection alone and wherein, when the battery pack is more than a second temperature, the fan is enabled and removal of at least a portion of heated air from the battery pack is done by forced convection;

(c5) a plurality of vertical and longitudinal shock absorbers, a set of vertical and longitudinal shock absorbers being positioned in each containment section to absorb at least a portion of shock imparted to the absorbers by movement of and impacts to the vehicle;

(c6) an electrically insulating material positioned between the rack structure and a supporting deck of the vehicle and/or between each cell and a supporting member in the rack structure; and

(c7) a support plate structure supporting the battery rack, the support plate structure being operable to permit and limit movement of the battery rack relative to the support plate structure.

2. The hybrid vehicle of claim 1, wherein the vehicle comprises feature (c1).

3. The hybrid vehicle of claim 2, wherein the vehicle comprises feature (c4) and wherein a plane of the fan is positioned below a phlrality of louvres in the hood member, the louvres permitting air in the external environment to enter into the upper plenum.

4. The hybrid vehicle of claim 1, wherein the vehicle comprises feature (c2) and further comprising a second plurality of airflow channels, the second plurality of airflow channels being transverse to the plurality of airflow channels and being positioned above and/or below the plurality of cells.

5. The hybrid vehicle of claim 1, wherein the vehicle comprises feature (c3) and wherein closure members are positioned to inhibit airflow between adjacent containment sections in the event of a fire.

6. The hybrid vehicle of claim 1, wherein the vehicle comprises feature (c4).

7. The hybrid vehicle of claim 1, wherein the vehicle comprises feature (c5).

8. The hybrid vehicle of claim 7, wherein each cell is able to withstand shock loading of no less than 2 gs in the longitudinal direction, no less than about 0.25 gs in the vertical direction, and no less than about 0.1 g lateral acceleration.

9. The hybrid vehicle of claim 7, wherein each cell is able to withstand constant vibration loading of no less than 0.00003-m deflection at 100 cycles per second and 0.03-m deflection at 1 cps.

10. The hybrid vehicle of claim 1, wherein the vehicle comprises feature (c6).

11. The hybrid vehicle of claim 1, wherein the vehicle comprises feature (c7).

12. A method for operating a hybrid vehicle, comprising:

(a) generating, by a prime mover, electrical energy;

(b) receiving, storing, and providing, as needed and by a battery pack, the electrical energy, the battery pack comprising a plurality of battery cells;

(c) providing to at least one motor the electrical energy; and

(d) at least one of the following additional steps;

(d1) passing, by free convection, heated air through upper and/or lower plenums and through a chimney vent into the ambient atmosphere, wherein a hood assembly comprises the chimney vent and hood and wall members respectively defining the upper and lower plenums, the upper and lower plenums being in fluid communication with the chimney vent and separated by the wall member, the wall member inhibiting airflow between the upper and lower plenums, and the lower plenum being in fluid communication with and removing heated air from the battery pack;

(d2) passing heated air through a plurality of airflow channels in communication with the lower plenum, a first set of airflow channels being positioned between adjacent battery cells and a second set of airflow channels being positioned between battery cells and the wall member, the airflow channels in the first set having a first cross-sectional area normal to the direction of airflow and the airflow channels in the second set having a second cross-sectional area normal to the direction of airflow, and wherein the first cross-sectional area is greater than the second cross-sectional area;

(d3) providing a rack structure, the rack structure comprising a plurality of vertical and horizontal fire wall members defining a plurality of containment sections, each section receiving a corresponding set of battery cells, whereby a fire in one section is retarded from spreading to an adjacent section;

(d4) providing a fan positioned in a fan duct, the fan duct being in communication with the chimney vent, wherein, when the battery pack is less than a first temperature, the fan is disabled and removal of heated air from the battery pack is done by free convection alone and wherein, when the battery pack is more than a second temperature, the fan is enabled and removal of heated air from the battery pack is done by forced convection;

(d5) providing a plurality of vertical and longitudinal shock absorbers, a set of vertical and longitudinal shock absorbers being positioned in each containment section to absorb at least a portion of shock imparted to the absorbers by movement of and impacts to the vehicle;

(d6) positioning an electrically insulating material between the rack structure and a supporting deck of the vehicle and/or between each cell and a supporting member in the rack structure; and

(d7) providing a support plate structure, the support plate structure supporting the battery rack and being operable to permit and limit movement of the battery rack relative to the support plate structure.

13. The method of claim 12, wherein step (d1) is performed.

14. The method of claim 13, wherein step (d4) is performed and wherein a plane of the fan is positioned below a plurality of louvres in the hood member, the louvres permitting air in the external environment to enter into the upper plenum.

15. The method of claim 12, wherein step (d2) is performed and further comprising a second plurality of airflow channels, the second plurality of airflow channels being transverse to the plurality of airflow channels and being positioned above and/or below the plurality of cells.

16. The method of claim 12, wherein step (d3) is performed and wherein closure members are positioned to inhibit airflow between adjacent containment sections in the event of a fire.

17. The method of claim 12, wherein step (d4) is performed.

18. The method of claim 12, wherein step (d5) is performed.

19. The method of claim 18, wherein each cell is able to withstand shock loading of no less than 2 gs in the longitudinal direction, no less than about 0.25 gs in the vertical direction, and no less than about 0.1 g lateral acceleration.

20. The method of claim 18, wherein each cell is able to withstand constant vibration loading of no less than 0.00003-m deflection at 100 cycles per second and 0.03-m deflection at 1 cps.

21. The method of claim 12, wherein step (d6) is performed.

22. The method of claim 12, wherein step (d7) is performed.