Description:FIELD OF THE INVENTION
[001] The present invention generally relates to a battery pack and more particularly relates to a system for cooling the battery pack.

BACKGROUND OF THE INVENTION
[002] A battery pack includes a plurality of battery cells interconnected to each other. The battery pack achieves desired voltage by connecting several battery cells in series, such that each battery cell adds its voltage potential to derive the total terminal voltage. Similarly, the battery pack achieves desired current by connecting several battery cells in parallel. The use of battery packs as an energy source is becoming prevalent in all parts of the world because of the advantages offered by stored electrical energy when compared to especially energy generated via fossil fuel powered internal combustion engines. Thus, battery packs are being used to power a variety of electrical and electronic devices including for power intensive applications like powering automobiles, work machines and power tools.
[003] The battery pack is the energy source of an electric vehicle which provides the required electrical energy to propel the vehicle and power its auxiliary components. During charging and discharging cycles of the battery pack, it releases a significant amount of heat which causes the battery cells of the battery pack to heat up. Higher temperatures are detrimental to the health of the battery cells as battery cell heating leads to faster capacity degradation and is likely to cause thermal runaway. Capacity degradation of the battery cells reduces performance and longevity of the battery pack. Thermal runaway of the battery cells further poses a huge safety risk as it could lead to fire and explosion of the battery pack. Ideally the battery cells need to be maintained between 25 degrees Celsius and 45 degrees Celsius for optimum performance, longevity and safety, regardless of ambient thermal conditions. To ensure safe operation of cells and optimum battery life, it is important to maintain uniform temperature across cells and optimum thermal condition in the battery pack overall.
[004] Generally, two types of cooling systems are employed for cooling the battery pack, i.e., active cooling and passive cooling. Small capacity battery packs generally require only passive cooling to maintain its temperature below the upper threshold limit. However, larger capacity battery packs generate more heat and employs active cooling means to maintain its temperature below the upper threshold limit. Conventional passive cooling systems employ regular conduction-convection cooling to dissipate heat generated inside the battery pack to a surrounding environment. Phase Change Material (PCM) may also be employed to absorb heat generated and dissipate this heat gradually to the surrounding environment. Active cooling systems conventionally employ forced air cooling where air flow is continuously maintained over the battery pack surface to carry heat away or uses liquid cooling where a coolant is circulated to the battery pack to absorb heat from the battery cells. The passive cooling means are not very effective in cooling the battery pack since cooling efficiency decreases with increase in temperature of the battery pack. In case of PCM, once all of the PCM is melted due to absorption of heat, phase change stops and heat absorption drastically drops. These effects lead to very high battery temperature due to reduced cooling efficiency as the temperature of the battery pack progressively increases.
[005] Therefore, active cooling systems have better performance and are better suited to cooling higher capacity battery packs. However, active cooling systems known in the art are bulky and consume a lot of space. Further, a separate cooling system has to be provided to dissipate heat from the coolant used, for e.g., a separate bulky heat exchanger disposed outside the battery pack is generally employed to cool the coolant used.
[006] Thus, there is a need in the art for a battery pack having a compact and efficient liquid cooling system, which addresses at least the aforementioned problems and limitations.

SUMMARY OF THE INVENTION
[007] In one aspect, the present invention is directed to a battery pack. The battery pack includes a casing and a plurality of battery cells disposed inside the casing. A plurality of conduits is disposed on a bottom portion of the casing and the plurality of conduits projects externally of the casing. The plurality of conduits is adapted to enable a dielectric coolant to flow through the plurality of conduits. The battery pack further includes a pump mounted to the casing. The pump circulates the dielectric coolant between the casing and the plurality of conduits. The plurality of conduits is adapted to dissipate heat from the dielectric coolant to a surrounding atmosphere.
[008] In an embodiment, the casing includes a first cover member and a second cover member. The second cover member has a base wall and one or more side walls extending orthogonally from the base wall. The first cover member is joined to the side walls of the second cover member to form the casing. The first cover member and the second cover member together define a cavity of the casing.
[009] In an embodiment, the plurality of battery cells is accommodated inside the cavity, and the plurality of the battery cells is immersed in the dielectric coolant.
[010] In an embodiment, the casing includes a plurality of fins formed integrally with the casing. The plurality of fins projects externally of the cavity. The plurality of fins is provided on the base wall of the second cover member and is adapted to dissipate heat from the casing to the surrounding atmosphere.
[011] In an embodiment, the plurality of conduits is disposed externally of the cavity and interspersed between the plurality of fins. The plurality of conduits is provided on the base wall of the second cover member.
[012] In an embodiment, the battery pack is oriented to have the plurality of fins and the plurality of conduits along an incoming air stream. The incoming airstream is generated by moving wind or forced air from a cooling fan.
[013] In an embodiment, the plurality of fins is spaced apart to be disposed parallel to one another. In another embodiment, the plurality of conduits includes lateral tubes aligned parallelly along the plurality of fins.
[014] In an embodiment, the battery pack includes an inlet tube which receives the dielectric coolant from the cavity and transfer the dielectric coolant to the plurality of conduits. The inlet tube is disposed along an edge of the base wall of the second cover member. The inlet tube is orthogonal to the plurality of conduits.
[015] In an embodiment, the battery pack includes an outlet tube which receives the dielectric coolant from the plurality of conduits. The dielectric coolant is returned to the cavity of the casing from the outlet tube. The outlet tube is disposed along another edge of the base wall of the second cover member and opposite to the inlet tube.
[016] In an embodiment, the battery pack includes a first pipe member and a second pipe member. The first pipe member is adapted to transfer the dielectric coolant from the cavity of the casing to the pump. The second pipe member is adapted to transfer the dielectric coolant from the pump to the inlet tube.
[017] In another embodiment, the battery pack includes a third pipe member adapted to transfer the dielectric coolant from the outlet tube to the cavity of the casing. In an embodiment, the third pipe member has a first connection tube to receive the dielectric coolant from the outlet tube, and a second connection tube to receive the dielectric coolant from the first connection tube and transfer the dielectric coolant to the cavity.
[018] In yet another embodiment, the pump causes the dielectric coolant to flow from the cavity to the inlet tube, from the inlet tube to the plurality of conduits so as to flow through the lateral tubes into the outlet tube, and from the outlet tube to be returned to the cavity.
[019] In an embodiment, the plurality of battery cells which are disposed in contact with the casing dissipates heat to the plurality of fins while simultaneously dissipating heat to the dielectric coolant surrounding the battery cells.
[020] In another embodiment, each of the plurality of conduits is in thermal contact with at least one of the plurality of fins to enable heat dissipation from the dielectric coolant flowing through the respective conduit to the corresponding fin while simultaneously dissipating heat from the dielectric coolant flowing through the respective conduit to the surrounding atmosphere.

BRIEF DESCRIPTION OF THE DRAWINGS
[021] Reference will be made to embodiments of the invention, examples of which may be illustrated in accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
Figure 1 illustrates a top perspective view of an exemplary battery pack, in accordance with an embodiment of the present invention.
Figure 2 illustrates a cross sectional perspective view of the battery pack, in accordance with an embodiment of the present invention.
Figure 3 illustrates a bottom perspective view of the battery pack, in accordance with an embodiment of the present invention.
Figure 4 illustrates a perspective view of a plurality of conduits, an inlet tube and an outlet tube of the battery pack, in accordance with an embodiment of the present invention.
Figure 5 illustrates a perspective view of the plurality of conduits, the inlet tube the outlet tube and an exemplary pump of the battery pack, in accordance with an embodiment of the present invention.
Figure 6 illustrates a top perspective view of the battery pack and an exemplary third pipe member of the battery pack, in accordance with an embodiment of the present invention.
Figure 7 illustrates a top perspective view of the battery pack and an exemplary second cover member of the battery pack, in accordance with an embodiment of the present invention.
Figure 8 illustrates a perspective view of the plurality of conduits, the inlet tube, the outlet tube, an exemplary first pipe member, an exemplary second pipe member and the third pipe member, in accordance with an embodiment of the present invention.
Figure 9 illustrates a perspective view of the plurality of conduits, the inlet tube, the outlet tube and the pump of the battery pack indicating flow direction of a dielectric coolant, in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION
[022] Various features and embodiments of the present invention here will be discernible from the following further description thereof, set out hereunder.
[023] The present invention generally relates to a battery pack and more particularly relates to a system for cooling the battery pack. In the ensuing exemplary embodiments, the battery pack is illustrated to have an octagonal pyramidal shape. However, it is contemplated that the disclosure in the present invention may be applied to any battery pack capable of accommodating the present subject matter without defeating the scope of the present invention.
[024] Figure 1 illustrates a top perspective view of an exemplary battery pack 10, in accordance with an embodiment of the present subject matter. The battery pack 10 includes a casing 20. The casing 20 includes a first cover member 22 and a second cover member 24. The second cover member 24 has a base wall 240 and one or more side walls 242. The one or more side walls 242 extend orthogonally from the base wall 240 to define a chamber between the base wall 240 and the one or more side walls 242 and to define an opening at the mouth of the chamber. The first cover member 22 is joined to the side walls 242 to cover the opening of the chamber, thus forming the casing 20 and defining a cavity 30 therein. In the illustrated embodiment, the casing 20 has an octagonal pyramidal shape and has eight side walls 242 extending from the base wall 240.
[025] Figure 2 illustrates a cross sectional perspective view of the battery pack 10, in accordance with an embodiment of the present subject matter. The battery pack 10 includes a plurality of battery cells 12 disposed inside the casing 20 in a dielectric coolant 40. In the illustrated embodiment, the plurality of battery cells 12 are cylindrical battery cells. The plurality of battery cells 12 can be any type of battery cells including prismatic battery cells. In an embodiment, cell holders are provided in the battery pack 10 to securely receive the plurality of battery cells 12. The cell holders may be integrally provided with only the first cover member 22 or only the second cover member 24 or with both the first cover member 22 and the second cover member 24. The plurality of battery cells 12 are immersed in the dielectric coolant 40. The dielectric coolant 40 allows for immersion cooling of the plurality of battery cells 12. The casing 20 is formed to have an airtight construction so as to hold the dielectric coolant 40 within the cavity 30 without leakage. In an embodiment, the plurality of battery cells 12 are completely submerged in the dielectric coolant 40. In another embodiment, the plurality of battery cells 12 are only partially immersed in the dielectric coolant 40. The battery pack 10 includes a plurality of conduits 60 which are adapted to enable the dielectric coolant 40 to flow through them. The plurality of conduits 60 are also adapted to dissipate heat from the dielectric coolant 40 to a surrounding atmosphere. The plurality of conduits 60 are disposed on the casing 20 and externally of the casing 20, i.e., outside the cavity 30 of the casing 20. In the illustrated embodiment, the plurality of conduits 60 is provided on the base wall 240 of the second cover member 24 and is in thermal communication with the surrounding atmosphere. In an embodiment, the plurality of conduits 60 is embedded on the base wall 240 and is in thermal communication with the base wall 240. In a further embodiment, the plurality of conduits 60 are constituted by lateral tubes 62 (shown in Figure 4). The lateral tubes 62 are disposed parallel to one another.
[026] Figure 3 illustrates a bottom perspective view of the battery pack 10, in accordance with an embodiment of the present subject matter. The casing 20 includes a plurality of fins 50 which are formed integrally with the casing 20. The plurality of fins 50 projects externally of the cavity 30. In the illustrated embodiment, the plurality of fins 50 is provided on the base wall 240 of the second cover member 24. The plurality of fins 50 is adapted to dissipate heat from the casing 20 to the surrounding atmosphere. Further, the fins 50 are spaced apart from one another and disposed parallel to one another for optimum heat dissipation to the surrounding atmosphere. In an embodiment, the plurality of fins 50 has a cuboidal shape with a rectangular cross section and straight longitudinal length, and the fins 50 are disposed parallel to one another. In yet another embodiment, the plurality of fins 50 is moulded or machined on the casing 20 so as to be integrally formed with the casing 20 for achieving minimal thermal resistance. In the illustrated embodiment, the plurality of fins 50 is moulded to or machined on the base wall 240 of the second cover member 24. Referring to Figures 2 and 3, in an embodiment, the plurality of conduits 60, i.e., the lateral tubes 62 are interspersed between the plurality of fins 50. In another embodiment, each of the lateral tubes 62 is sandwiched between a pair of the fins 50, and the lateral tubes 62 are aligned parallelly along the plurality of fins 50. In yet another embodiment, the battery pack 10 is oriented to have the plurality of fins 50 and the plurality of conduits 60 disposed along an incoming air stream. This disposition allows for the best possible cooling efficiency as the flowing wind carries away heat from the plurality of fins 50 and the plurality of conduits 60. In an embodiment, the battery pack 10 is mounted to a vehicle, such that the incoming airstream is generated by moving wind induced by motion of the vehicle. The battery pack 10 may be mounted to be in line with a floor of the vehicle or may have any other disposition that allows for the incoming airstream to flow parallelly to the plurality of fins 50 and the plurality of conduits 60. In another embodiment, the incoming airstream is generated by forced air produced from a cooling fan.
[027] The battery pack 10 includes a pump 70 mounted to the casing 20. The pump 70 is adapted to circulate the dielectric coolant 40 between the cavity 30 and the plurality of conduits 60. In the illustrated embodiment, the pump 70 is mounted externally of the casing 20. However, in an embodiment the pump 70 may be mounted inside the cavity 30. Further, the pump 70 may be mounted to the first cover member 22 or the second cover member 24. In an embodiment, the pump 70 is fastened to the casing 20 with the aid of any type of fasteners known in the art.
[028] Figure 4 illustrates a perspective view of a plurality of conduits 60, an inlet tube 80 and an outlet tube 82 of the battery pack 10, in accordance with an embodiment of the present subject matter. The battery pack 10 includes an inlet tube 80. The inlet tube 80 receives the dielectric coolant 40 from the cavity 30 of the casing 20 and transfers the dielectric coolant 40 to the plurality of conduits 60. In an embodiment, the pump 70 receives the dielectric coolant 40 from the cavity 30 and pumps the dielectric coolant 40 into the inlet tube 80. The connections between the cavity 30, the pump 70 and the inlet tube 80 are internal connections. In another embodiment, the inlet tube 80 is disposed along an edge of the base wall 240 of the second cover member 24. This disposition allows for the lateral tubes 62 to have the maximum length for heat dissipation. In yet another embodiment, the inlet tube 80 is disposed to be orthogonal to the plurality of conduits 60. The inlet tube 80 and the plurality of conduits 60, i.e., the lateral tubes 62 are in fluid communication with each other and are connected internally. The battery pack 10 further includes an outlet tube 82 to receive the dielectric coolant 40 from the plurality of conduits 60 and transfer the dielectric coolant 40 to the pump 70. From the pump 70 the dielectric coolant 40 is returned to the cavity 30 of the casing 20. In an embodiment, the outlet tube 82 is disposed along another edge of the base wall 240 such that it is opposite the inlet tube 80. In an embodiment, the outlet tube 82 and the plurality of conduits 60, i.e., the lateral tubes 62 are in fluid communication with each other and are connected internally. In a further embodiment, the outlet tube 82 consists of a first section and a second section, the first section being disposed along another edge of the base wall 240 such that it is opposite the inlet tube 80. The second section of the outlet tube 82 bends along yet another edge of the base wall 240 to be disposed orthogonally to the plurality of conduits 60 and the first section of the outlet tube 82. This allows the dielectric coolant 40 to flow a further distance to dissipate even more heat before being pumped back into the cavity 30.
[029] Figure 5 illustrates a perspective view of the plurality of conduits 60, the inlet tube 80 the outlet tube 82 and an exemplary pump 70 of the battery pack 10, in accordance with an embodiment of the present subject matter. Figure 6 illustrates a top perspective view of the battery pack 10 and an exemplary third pipe member 84 of the battery pack 10, in accordance with an embodiment of the present subject matter. Referring to Figures 5 and 6, the battery pack 10 includes the third pipe member 84 which is adapted to transfer the dielectric coolant 40 from the outlet tube 82 to the cavity 30 of the casing 20. In the illustrated embodiment, the third pipe member 84 includes a first connection tube 86 and a second connection tube 88. The first connection tube 86 receives the dielectric coolant 40 from the outlet tube 82. The second connection tube 88 receives the dielectric coolant 40 from the first connection tube 86 and transfers the dielectric coolant 40 to the cavity 30. The first connection tube 86 is in fluid communication with the outlet tube 82 at one end and with the second connection tube 88 at its other end. The second connection tube 88 is in fluid communication with the first connection tube 86 at one end and with the cavity 30 of the casing 20 at its other end. In the illustrated embodiment, the first connection tube 86 is an L bend tube. In the illustrated embodiment, the second connection tube 88 is a J bend tube.
[030] Figure 7 illustrates a top perspective view of the battery pack 10 and an exemplary second cover member 24 of the battery pack 10, in accordance with an embodiment of the present subject matter. Figure 8 illustrates a perspective view of the plurality of conduits 60, the inlet tube 80, the outlet tube 82, an exemplary first pipe member 72, an exemplary second pipe member 74 and the third pipe member 84, in accordance with an embodiment of the present invention. Referring to Figures 7 and 8, the first pipe member 72 is adapted to transfer the dielectric coolant 40 from the cavity 30 of the casing 20 to the pump 70. The first pipe member 72 is in fluid communication with the cavity 30 of the casing 20 at one end and with the pump 70 at its other end. The second pipe member 74 is adapted to transfer the dielectric coolant 40 from the pump 70 to the inlet tube 80. The second pipe member 74 is in fluid communication with the pump 70 at one end and with the inlet tube 80 at its other end. In an embodiment, connection joints between the cavity 30 and the first pipe member 72, the first pipe member 72 and the pump 70, the pump 70 and the second pipe member 74, the second pipe member 74 and the inlet tube 80, the inlet tube 80 and the plurality of conduits 60, the plurality of conduits 60 and the outlet tube 82, the outlet tube 82 and the third pipe member 84, the third pipe member 84 and the cavity 30 are all joined by brazing to form sealed airtight joints to prevent the dielectric coolant 40 from leaking. In another embodiment, the inlet tube 80, the plurality of conduits 60, the outlet tube 82, the first pipe member 72, the second pipe member 74 and the third pipe member 84 all have the same cross-sectional area.
[031] Figure 9 illustrates a perspective view of the plurality of conduits 60, the inlet tube 80, the outlet tube 82 and the pump 70 of the battery pack 10 indicating flow direction of the dielectric coolant 40, in accordance with an embodiment of the present subject matter. The pump 70 causes the dielectric coolant 40 to flow from the cavity 30 to the inlet tube 80, due to a low pressure produced in the inlet tube 80. From the inlet tube 80 the dielectric coolant 40 flows into the plurality of conduits 60 and through the lateral tubes 62 into the outlet tube 82. From the outlet tube 82 the dielectric coolant 40 flows back into the cavity 30. Thus, the dielectric coolant 40 in the cavity 30 which absorbs heat generated by the plurality of battery cells 12 and other heat generating components of the battery pack 10 is pumped through the plurality of conduits 60 to dissipate heat to the surrounding environment and the cooled dielectric coolant 40 is returned back into the cavity 30. In an embodiment, the pump 70 is adapted to be actuated when a temperature of the battery pack crosses a threshold temperature and continue to operate and pump the dielectric coolant 40 while the temperature of the battery pack 10 stays above the said threshold temperature. For this purpose, a temperature monitoring system is provided within the battery pack 10. The monitoring of temperature of the battery pack 10 and the actuation of the pump 70 is monitored by an electronic device of the battery pack 10, for e.g., a Battery Management System. Further, the battery pack 10 may be mounted horizontally, vertically or in an inclined manner so as to achieve the best heat dissipation and cooling efficiency.
[032] Referring to Figures 2 and 3, the plurality of battery cells 12 and the plurality of conduits 60 are adapted for two-way cooling. The plurality of battery cells 12 which are disposed in contact with the casing 20 dissipate heat to the plurality of fins 50 while simultaneously dissipating heat to the dielectric coolant 40 surrounding the battery cells 12. In an embodiment, a bottom of the battery cells 12 which are in contact with the base wall 240 dissipate heat to both the plurality of fins 50 and plurality of conduits 60 through the base wall 240, and to the dielectric coolant 40 simultaneously. Each of the plurality of conduits 60 is in thermal contact with at least one of the plurality of fins 50 to enable heat dissipation from the dielectric coolant 40 flowing through the respective conduit 60 to the corresponding fin 50. The conduits 60 that are sandwiched between a pair of the fins 50 dissipate heat to both the fins 50 at the same time. While dissipating heat to the corresponding fins 50, the plurality of conduits 60 is adapted to simultaneously dissipate heat from the dielectric coolant 40 flowing through the respective conduit 60 to the surrounding atmosphere.
[033] Advantageously, the present claimed invention provides a battery pack and an immersion cooling system for the battery pack. The claimed configurations of the battery pack as discussed above are not routine, conventional, or well understood in the art, as the claimed configurations of the battery pack enable the following solutions to the existing problems in conventional technologies. Specifically, the battery pack achieves efficient and effective cooling of the battery cells and other heat generating components of the battery pack, thereby increasing battery performance, longevity and safety. The immersion cooling system disclosed in the present invention allows for a compact construction of the battery pack since use of a separate radiator is eliminated. The radiator forms an integral part of the casing of the battery pack in the guise of the fins integrated with the casing and the plurality of conduits embedded on the casing. This also ensures modularity of the battery pack as the cooling system is integrated with the casing of the battery pack. The battery pack disclosed can be employed in any type of vehicle including two-wheeled and three-wheeled vehicles and heavy power tools that use high-capacity batteries that need active cooling. The battery pack also improves cooling efficiency by enabling two-way cooling by providing for maximum surface area for heat dissipation from the surface of the fins and the conduits. Other advantages include increased durability, better aesthetics, better ergonomics, overall weight reduction, reduction in total number of parts used, and reduction in overall cost.
[034] While the present invention has been described with respect to certain embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.

List of Reference Numerals:
10 - battery pack
12 - plurality of battery cells
20 - casing
22 - first cover member
24 - second cover member
240 - base wall
242 - one or more side walls
30 - cavity of the casing
40 - dielectric coolant
50 - plurality of fins
60 - plurality of conduits
62 - lateral tubes
70 - pump
72 - first pipe member
74 - second pipe member
80 - inlet tube
82 - outlet tube
84 - third pipe member
86 - first connection tube
88 - second connection tube
, C , Claims:1. A battery pack (10) comprising:
a casing (20);
a plurality of battery cells (12) disposed inside the casing (20);
a plurality of conduits (60) disposed on a bottom portion of the casing (20) and projecting externally of the casing (20), the plurality of conduits (60) configured to enable a dielectric coolant (40) to flow through the plurality of conduits (60); and
a pump (70) mounted to the casing (20), the pump (70) configured to circulate the dielectric coolant (40) between the casing (20) and the plurality of conduits (60);
wherein, the plurality of conduits (60) being configured to dissipate heat from the dielectric coolant (40) to a surrounding atmosphere.

2. The battery pack (10) as claimed in claim 1, wherein the casing (20) comprising: a first cover member (22); and a second cover member (24), the second cover member (24) having a base wall (240) and one or more side walls (242) extending orthogonally from the base wall (240), and the first cover member (22) being joined to the side walls (242) of the second cover member (24) to form the casing (20) and defining a cavity (30) therein.

3. The battery pack (10) as claimed in claim 2, wherein the plurality of battery cells (12) being accommodated inside the cavity (30), and the plurality of battery cells (12) being immersed in the dielectric coolant (40).

4. The battery pack (10) as claimed in claim 2, wherein the casing (20) comprising a plurality of fins (50) formed integrally with the casing (20) and projecting externally of the cavity (30), the plurality of fins (50) provided on the base wall (240) of the second cover member (24), and the plurality of fins (50) configured to dissipate heat from the casing (20) to the surrounding atmosphere.

5. The battery pack (10) as claimed in claim 4, wherein the plurality of conduits (60) being disposed externally of the cavity (30) and interspersed between the plurality of fins (50), the plurality of conduits (60) provided on the base wall (240) of the second cover member (24).

6. The battery pack (10) as claimed in claim 5, wherein the battery pack (10) being oriented to have the plurality of fins (50) and the plurality of conduits (60) along an incoming air stream, wherein the incoming airstream is generated by moving wind or forced air from a cooling fan.

7. The battery pack (10) as claimed in claim 5, wherein the plurality of fins (50) is spaced apart to be disposed parallel to one another and the plurality of conduits (60) comprising lateral tubes (62) aligned parallelly along the plurality of fins (50).

8. The battery pack (10) as claimed in claim 5 comprising an inlet tube (80) configured to receive the dielectric coolant (40) from the cavity (30) and transfer the dielectric coolant (40) to the plurality of conduits (60), the inlet tube (80) disposed along an edge of the base wall (240) of the second cover member (24), and the inlet tube (80) being orthogonal to the plurality of conduits (60).

9. The battery pack (10) as claimed in claim 8 comprising an outlet tube (82) configured to receive the dielectric coolant (40) from the plurality of conduits (60), the dielectric coolant (40) being returned to the cavity (30) of the casing (20) from the outlet tube (82), and the outlet tube (82) disposed along another edge of the base wall (240) of the second cover member (24) and opposite the inlet tube (80).

10. The battery pack (10) as claimed in claim 9 comprising: a first pipe member (72) configured to transfer the dielectric coolant (40) from the cavity (30) of the casing (20) to the pump (70); and a second pipe member (74) configured to transfer the dielectric coolant (40) from the pump (70) to the inlet tube (80).

11. The battery pack (10) as claimed in claim 9 comprising a third pipe member (84) configured to transfer the dielectric coolant (40) from the outlet tube (82) to the cavity (30) of the casing (20).

12. The battery pack (10) as claimed in claim 11, wherein the third pipe member (84) comprises: a first connection tube (86) configured to receive the dielectric coolant (40) from the outlet tube (82); and a second connection tube (88) configured to receive the dielectric coolant (40) from the first connection tube (86) and transfer the dielectric coolant (40) to the cavity (30).

13. The battery pack (10) as claimed in claim 9, wherein the pump (70) causes the dielectric coolant (40) to flow from the cavity (30) to the inlet tube (80), from the inlet tube (80) to the plurality of conduits (60) so as to flow through the lateral tubes (62) into the outlet tube (82), and from the outlet tube (82) to be returned to the cavity (30).

14. The battery pack (10) as claimed in claim 5, wherein the plurality of battery cells (12) disposed in contact with the casing (20) is configured to dissipate heat to the plurality of fins (50) while simultaneously being configured to dissipate heat to the dielectric coolant (40) surrounding the battery cells (12).

15. The battery pack (10) as claimed in claim 5, wherein each of the plurality of conduits (60) is in thermal contact with at least one of the plurality of fins (50) to enable heat dissipation from the dielectric coolant (40) flowing through the respective conduit (60) to the corresponding fin (50) while simultaneously being configured to dissipate heat from the dielectric coolant (40) flowing through the respective conduit (60) to the surrounding atmosphere.