Description:FIELD OF THE INVENTION
[0001] The present invention relates to the domain of a battery pack, more specifically the present application is related to a cell holder of different dimensions for holding plurality of cells in the battery pack.

BACKGROUND
[0002] Battery pack, such as Lithium-ion (Li-ion) battery pack or the like, are used to power components in applications, such as electric vehicles, hybrid vehicles, mobile phones, laptops, medical equipment’s or the like. A battery pack has a plurality of cells in electrical connection with each other.

[0003] A lithium-ion battery is usually constituted of a positive electrode, a negative electrode, an electrolyte, and a separator. As a positive electrode active material to be used for the positive electrode, lithium cobaltate, manganese spinel, or the like are mainly used. Since the positive electrode active material has a high electric resistance, the electric resistance of the positive electrode is decreased by using carbon-based conductive additives. As a binder, for example, styrene-butadiene rubber, fluororubber, synthetic rubber, a polymer such as polyvinylidene fluoride, an acryl resin, or the like are used.

[0004] A negative electrode active material to be used is natural graphite, artificial graphite obtained by thermally treating coal, petroleum pitch or the like at a high temperature, amorphous carbon obtained by thermally treating coal, petroleum pitch coke, acetylene pitch coke or the like, a lithium alloy such as metallic lithium or AlLi, or the like. Further, carbon-based conductive additives are used for a negative electrode in some cases for the purpose of decreasing the resistance.

[0005] A holder used for battery adhesion-fixation structure has been usually provided with multiple holder holes. More specifically, a battery cell is inserted into each of the holder holes and is adhered or bonded with the holder via an adhesive agent onto an inner peripheral face of the holder holes. Moreover, an electrode terminal located at one of the opposite ends of the battery cells is exposed at one of the axials opposite ends of the holder holes. In addition, a bus bar connects electrically between the electrode terminals exposed at the one of the axials opposite ends of the holder holes.

[0006] Battery pack comprises plurality of cells in electrical connection with each other. During operation, each cell generates heat which is to be dissipated from the battery pack to ensure proper operation of the battery pack without failing. More specifically, the battery pack, such as Lithium-ion (Li-ion) battery pack, have an issue of thermal runaway. For instance, when a cell or an area within the cell or a plurality of cells of a Li-ion battery pack achieves an elevated temperature due to a thermal failure or a mechanical failure or internal or external short circuiting or an electro-chemical abuse a large amount of heat is generated. When the generated heat is larger than the heat dissipation, various side reactions between the components inside the battery pack are induced. This may cause further heat generation and the pressure and the temperature of the battery pack may increase sharply. This may lead to inflammation and/or explosion of the battery pack. This process is referred to as thermal runaway. Accordingly, during operation of the battery pack, to avoid thermal runaway and to ensure proper operation of the battery pack without failing, heat generated by each cell is to be dissipated from the battery pack.

[0007] Conventionally, to dissipate the heat generated in the plurality of cells of the battery pack and to overcome the thermal runaway issue, the battery pack includes liquid-filling materials, such as cooling liquid. However, use of such materials cause handling problems of the battery pack. In some conventional battery pack, Phase Change Material (PCM) is filled in the battery pack for heat transfer. The PCM absorbs the heat generated by the cells and change its state from liquid to solid. However, the PCM has very low conductivity. Further, the filling material, such as the liquid-filing material and the PCM, is used only at tip of the cells. Therefore, the thermal exchange only occurs at the tip of the cells and the thermal exchange occurring through the surface of the cells is not performed thereby leading to sub optimal cooling of the battery pack.

[0008] Generally, in all of battery pack available in the art cell holder dimensions is kept same for both positive and negative terminals of the cell. More specifically, in the conventional art diameter of both the positive and negative terminals of the cell holder are kept same. Accordingly, this will reduce the contact area between the tip of the cells and the battery pack casing. Therefore, in such a configuration heat will be dissipated from the tip of the cells only. The dimension of the cell holder can be a measurable extent of a particular kind, such as length, breadth, depth, or height.

[0009] In light of the aforesaid problem available in the art there is a need to develop a new cell holder to overcome the deficiency available in the art. Further, there is also a need for a light cell holder which will help in better heat dissipation and reduce the overall weight of the battery.

[00010] The above information as disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

SUMMARY
[00011] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

[00012] In one of the embodiments of the present application, the power unit assembly comprises a plurality of cells and a plurality of cell holders. The plurality of cells comprises a first group of cells and a second group of cells. The plurality of cell holders comprises a plurality of conduits. Further, the plurality of conduits are configured to receive the plurality of cells. Furthermore, the plurality of conduits comprises a first group of conduits and a second group of conduits and the first group of conduits have a first dimension, and the second group of conduits have a second dimension. Moreover, the second dimension of the second group of conduits is greater than the first dimension of the first group of conduits.

[00013] In one of the embodiments of the present application, the first set of cells being of positive polarity and the second set of cells being of negative polarity. Further, the plurality of cells being in an electrical connection with each other.

[00014] In one of the embodiments of the present application, the first group of cells being disposed within the first group of conduits such that a negative terminal of each of the first group of cells being facing a casing bottom of the power unit and a positive terminal being facing a casing top of the power unit.

[00015] In one of the embodiments of the present application, the second group of cells being disposed within the second group of conduits such that the negative terminal of each of the first group of cells being facing the casing top of the power unit and the positive terminal being facing the casing bottom of the power unit.

[00016] In one of the embodiments of the present application, the casing top and the casing bottom are parts of a casing of the power unit. Further, the casing top and the casing bottom being connected with each other to form the casing of the power unit. Furthermore, the casing being made of a thermally conductive material and an electrically insulating material.

[00017] In one of the embodiments of the present application, the first dimension of the first group of conduits and the second dimension of the second group of conduits being corresponds to shape of the first group of cells and to the second group of cells.

[00018] In one of the embodiments, the first dimension and the second dimension correspond to a width of the first group of conduits and the second group of conduits, respectively.

[00019] In one of the embodiments, the first dimension and the second dimension correspond to a diameter of the first group of conduits and the second group of conduits, respectively.

[00020] In one of the embodiments of the present application, the first set of cells being disposed in the first cell holder at a predefined distance from the second set of cells.

[00021] In one of the embodiments of the present application, the first group of cells being disposed in the plurality of cell holder at a predefined distance from the second group of cells.

[00022] In one of the embodiments of the present application, the plurality of cells is disposed co-axially with the plurality of conduits.

[00023] In one of the embodiments of the present application, the power unit comprises one or more interconnectors.

[00024] In one of the embodiments of the present application, the power unit comprises at least one layer of Thermal Interface Material (TIM).

[00025] In one of the embodiments of the present application, at least one layer of TIM being connected from an inner side with the casing top and the casing bottom.

[00026] In one of the embodiments of the present application, at least one layer of TIM being disposed between the casing top and the one or more interconnectors.

[00027] In one of the embodiments of the present application, at least one layer of TIM being disposed between the casing bottom and the one or more interconnectors.

[00028] In one of the embodiments of the present application, the casing comprises a plurality of heat dissipating fins. Further, the plurality of heat dissipating fins being disposed on an outer surface of the casing top and the casing bottom.

[00029] In one of the embodiments of the present application, the power unit corresponds to at least one battery.

[00030] In one of the embodiments of the present application, the power unit comprises Phase Change Material (PCM). Further, the PCM material being filled in the plurality of conduits.

[00031] In one of the embodiments of the present application, the second group of conduits comprises more PCM material than the first group of conduits.

[00032] In one of the embodiments of the present application, the plurality of cell holders comprises a plurality of protrusions being disposed on an outer top surface of the plurality of cell holders and between each of the plurality of conduits. Further, the plurality of protrusions being configured to restrict movement of the one or more interconnectors.

[00033] In one of the embodiments of the present application, the plurality of cell holders comprises of a cell holder top and a cell holder bottom. Further, the cell holder top and the cell holder bottom being connected to each other at edges.

BRIEF DESCRIPTION OF FIGURES:
[00034] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate preferred embodiments of the invention, and together with the general description given above and the detailed description given below, serve to explain features of the invention.

[00035] Figure 1 illustrates a battery pack as per one of the embodiments of the present invention.

[00036] Figure 2 illustrates exploded view of the battery pack as per one of the embodiments of the present invention.

[00037] Figure 3 illustrates an pack perspective view of the cell holder as per one of the embodiments of the present invention.

[00038] Figure 4 illustrates a perspective side view of the cell holder as per one of the embodiments of the present invention.

[00039] Figure 5 illustrates a top view of the cell holder as per one of the embodiments of the present invention.

DETAILED DESCRIPTION
[00040] Exemplary embodiments detailing features of a battery pack in accordance with the present subject matter will be described hereunder with reference to the accompanying drawings. Various aspects of different embodiments of the present invention will become discernible from the following description set out hereunder. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the present subject matter. Further, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. Additionally, all numerical terms, such as, but not limited to, “first”, “second”, “third”, “primary”, “secondary”, “main” or any other ordinary and/or numerical terms, should also be taken only as identifiers, to assist the reader's understanding of the various elements, embodiments, variations and/or modifications of the present disclosure, and may not create any limitations, particularly as to the order, or preference, of any element, embodiment, variation and/or modification relative to, or over, another element, embodiment, variation and/or modification.

[00041] The following detailed description refers to the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the following description to refer to the same or similar elements. While embodiments may be described, modifications, adaptations, and other implementations are possible. For example, substitutions, additions, or modifications may be made to the elements illustrated in the drawings, and the methods described herein may be modified by substituting, reordering, or adding stages to the disclosed methods. Accordingly, the following detailed description does not limit the claimed subject matter. Instead, the proper scope of the claimed subject matter is defined by the appended claims. It should be noted that the description and figures merely illustrate principles of the present subject matter. Various arrangements may be devised that, although not explicitly described or shown herein, encompass the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects, and examples of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof.

[00042] Further, various embodiments disclosed herein are to be taken in the illustrative and explanatory sense and should in no way be construed as limiting of the present disclosure. All joinder references (e.g., attached, affixed, coupled, disposed, etc.) are only used to aid the reader's understanding of the present disclosure, and may not create limitations, particularly as to the position, orientation, or use of the systems and/or methods disclosed herein. Therefore, joinder references, if any, are to be construed broadly. Moreover, such joinder references do not necessarily infer those two elements are directly connected to each other.

[00043] It will also be appreciated that one or more of the elements depicted in the drawings/figures can also be implemented in a more separated or integrated manner, or even removed or rendered as inoperable in certain cases, as is useful in accordance with a particular application. Additionally, any signal hatches in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise specifically specified.

[00044] With the initiation of electric vehicles and electric vehicles, there is a growing interest in an automotive industry to develop electrical machines which dissipate heat properly from the cells of the battery pack, light in weight, utilize less space and are efficient in operation. Therefore, the direction of innovation in designing electrical machines is to develop electrical machines which have good heat dissipation, lighter in weight and compact size for a given power rating, or for a given size, power rating should be more than the present rating. However, in general, close packaging of components in compact machines leads to greater electrical and magnetic interactions between the components and may lead to high core losses in case of electrical machines using permanent magnets.

[00045] Battery pack comprises a plurality of cells in electrical connection with each other. During operation, each cell generates heat which is to be dissipated from the battery pack to ensure proper operation of the battery pack without failing. More specifically, battery pack, such as Lithium-ion (Li-ion) battery pack or the like, have an issue of thermal runaway. For instance, when a cell, an area within the cell, or a plurality of cells of a Li-ion battery pack achieves an elevated temperature due to a thermal failure, a mechanical failure, internal or external short circuiting, or an electro-chemical abuse, a large amount of heat is generated. When the heating generated is larger than the heat dissipation, various side reactions between components inside the battery pack are induced. This may cause further heat generation and the pressure and the temperature of the battery pack may increase sharply. This may lead to inflammation and/or explosion of the battery pack. This process is referred to as the thermal runaway.

[00046] The present subject matter relates to heat transfer in power unit assembly such as but not limited to battery pack assemblies. With the implementations of the present subject matter, heat generated by the cells of the battery pack assemblies can be efficiently dissipated from the battery pack assemblies, thereby, the thermal runaway can be eliminated.

[00047] With reference to figure 1, in which a power unit assembly (100) is shown. The power unit assembly (100) comprises a casing to provide a cover and to protection to the components of the power unit assembly (100). Particularly, the casing enclose the plurality of cells present inside the power unit assembly (100). In addition to providing cover and protecting components of the power unit assembly (100), the casing may facilitate dissipating the heat away from the power unit assembly (100) to the surroundings. The power unit assembly (100) may be a battery pack, also in the present specification the terms battery pack and power unit assembly are used interchangeably. Accordingly, in an example, the casing may be made of a thermally conductive and electrically insulating material. The power unit assembly (100) comprises a casing top (102) and a casing bottom (104). The casing top (102) is placed opposite to the casing bottom (104). Further, the casing top (102) and the casing bottom (104) are connected with each other to form the casing of the power unit assembly (100). Furthermore, the battery pack (100) also comprises plurality of heat dissipating fins (106) present on both the casing top (202) and the casing bottom (218) for dissipating heat from inside the battery pack (100) to the surroundings. The casing top (102) and the casing bottom (104) comprises an inner area which is facing inside the battery pack (100) and an outer area which is opposite to the inner area and comprises plurality of heat dissipating fins (106).

[00048] With reference to figure 2, an exploded view (200) of the battery pack (100) is shown. In the exploded view (200), the battery pack (100) comprises the casing top (102) and the casing bottom (104), at least one or more layer of Thermal Interference Material (TIM) (204, 216), one or more interconnectors, one or more cell holders and plurality of cells (210) are shown. The one or more interconnectors comprising at least a first interconnector (206) and a second interconnector (214). Further, the first interconnector (206) is placed close to the casing top (102) in comparison to the casing bottom (104) and the second interconnector (214) is placed closer to the casing bottom (104) in comparison to the casing top (102). Furthermore, one or more cell holders of the battery pack (100) is further divided into two parts that is a cell holder top (208) and a cell holder bottom (212). The cell holder top (208) is placed opposite to the cell holder bottom (212) and the cell holder top (208) is connected to the cell holder bottom (212) to form a cell holder. The cell holder top (208) is connected to the cell holder bottom (212) using various means such as bit not limited to welding.

[00049] The one or more layer of Thermal Interface Materials (TIM) (204, 216) is used to remove the excess heat from battery pack (100) to the surrounding to regulate the temperature of the plurality of cells (210) inside the battery pack (100) and to improve the functionality of the of the plurality of cells (210) which will result in prolong life of the plurality of cells (210) and the battery pack (100). The one or more layer of TIM comprising first TIM layer (204) and second TIM layer (216). There are different ways in which one or more TIMs (204, 216) are used in the battery pack (100). The one or more TIMs (204, 216) are placed adjacent to the casing top (102) and to the casing bottom (104), thereby conducting heat and providing a thermal path for heat to flow away from the battery pack (100) to the environment via the plurality of heat dissipating fins (106). The functionality of a TIM comes from thermally conductive material(s) that are laden in a dispersion or solid matrix. Further, first TIM layer (204) is placed between the casing top (102) and the first interconnector (206) and the second TIM layer (216) is placed between the casing bottom (104) and the second interconnector (214). Further, the second interconnector (214) is placed between the cell holder bottom (212) and the second TIM layer (216). Furthermore, the cell holder top (208) and the cell holder bottom (212) comprising plurality of cells (210). Moreover, the first interconnector (206) is placed between the first TIM layer (204) and the cell holder top (208). In one of the embodiments of the present application the at least one layer of TIM (204, 216) being connected from an inner side with the casing top (102) and the casing bottom (104).

[00050] The one or more interconnectors (206, 214) within the battery pack (100) are used to connect the plurality of cells (210) electrically. In one of the embodiments of the present application, one or more interconnectors (206, 214) are essential to monitoring efficiency, health and operational systems and communicating that data to the appropriate channels. The one or more interconnectors (206, 214) pass along critical information to other sensors – for example, sensors that detect leaks as well as heat and pressure levels that detect the health of every component of the battery pack (100). These components also communicate battery operations and safety concerns to the user, giving them confidence in and control over the status of a vehicle or the like. Further, there is a separate opening in the cell holder top (208) and cell holder bottom (212) for the wires.

[00051] The battery pack (100) comprises the plurality of cells (210). The plurality of cells (210) may include a first group of cells and a second group of cells. The plurality of cells (210) is in electrical connection with each other. The plurality of cells (210) cells may be, for example, Lithium-ion (Li-ion) cells, a nickel hydrogen battery, or the like. Accordingly, the battery pack (100) may be a Li-ion battery pack assembly, a nickel hydrogen battery pack assembly, or the like. The battery pack (100) may include one or more interconnectors (206, 214) to connect the plurality of cells (210). Further, the first group of cells being disposed in the plurality of cell holder at a predefined distance from the second group of cells.

[00052] With reference to figure 3 (300), illustrate how the cell holder top (208) and cell holder bottom (212) are connected with each other to form at least one cell holder from the plurality of cell holders and each cell holder accommodate plurality of cells (210). Further, the figure 3 also depicts that a first interconnector (206) is disposed onto the cell holder top (208).

[00053] With reference to figure 4 and figure 5, (400) and (500) illustrate the cell holder top (208). For the sake of brevity, figure 4 and figure 5 are explained in conjunction with each other. More specifically, (400) is showing one of the cell holder top (208) from the plurality of cell holders. The plurality of cells (210) holders comprising the plurality of conduits (502, 504). The plurality of conduits (502, 504) is designed to hold at least a cell from the plurality of cells (210). Further, the shape of each of the plurality of conduits (502, 504) corresponds to shape of the plurality of cells (210). The shape of the plurality of conduits (502, 504) may be but not limited to shapes such as cylindrical in shape, brick shape, and a flat-rectangular shape. In one of the embodiments of the present application, the plurality of cells (210) are placed coaxially within the plurality of conduits (502, 504).In one of the embodiments, the first dimension and the second dimension correspond to a width of the first group of conduits (504) and second group of conduits (502), respectively. In one of the embodiments, the first dimension and the second dimension correspond to a diameter of the first group of conduits (504) and second group of conduits (502), respectively.

[00054] The (500) illustrate the outer top surface of one of the cell holder top (208) from the plurality of cell holders. The outer top surface of the cell holder top (208) is the surface which will connect with the first interconnect (206). More specifically, (500) is showing the cell holder top (208) comprising multiple conduits (502, 504), and the multiple conduits (502, 504) are arranged in a pattern. Further, the plurality of conduits (502, 504) comprising a first group of conduits (504) and a second group of conduits (502). Furthermore, the first group of conduits (504) having a first dimension and the second group of conduits (502) having a second dimension. The second dimension of the second group of conduits (502) is greater than the first dimension of the first group of conduits (504). Particularly, in the present embodiment, diameter of the second group of conduits (502) is greater than the diameter of the first group of conduits (504). The dimension of the plurality of conduits (502, 504) may depend on the shape of the plurality of conduits (502, 504). More specifically, in one of the embodiments, the first dimension and the second dimension correspond to a width of the first group of conduits (504) and second group of conduits (502), respectively. Similarly, in one of the embodiments, the first dimension and the second dimension correspond to a diameter of the first group of conduits (504) and second group of conduits (502), respectively. The dimension of the cell holder can be a measurable extent of a particular kind, such as length, breadth, depth, or height.

[00055] In one of the embodiments of the present application, the first group of cells are disposed within the first group of conduits (504) such that a negative terminal of each of the first group of cells is facing the casing bottom (104) of the power unit assembly (100) and a positive terminal is facing the casing top (102) of the power unit assembly (100). In one of the embodiments of the present application, the second group of cells are disposed within the second group of conduits (504) such that the negative terminal of each of the first group of cells being facing the casing top (102) of the power unit assembly (100) and the positive terminal being facing the casing bottom (104) of the power unit assembly (100).

[00056] The first dimension of the first group of conduits (504) and the second dimension of the second group of conduits (502) being corresponds to shape of the first group of cells and to the second group of cells. The multiple conduits (502, 504) are arranged in plurality of rows for example one row of second group of conduits (502) is followed by the first group of conduits (504). Accordingly, using the present configuration the plurality of cells (210) will have more contact area for thermal interface material at the second group of conduits (502) which will improve cooling of the plurality of cells (210) of the power unit assembly (100)which will increase the efficiency of the plurality of cells (210) and of the power unit assembly (100). In one of the embodiments of the present application the polarity of the first group of cells which are disposed within the first group of conduits (504) is opposite from the polarity of the second group of cells which are disposed within the second group of conduits (502).

[00057] The cell holder top (208) of the plurality of cell holders also comprises plurality of protrusions (506), as shown in figure 5. The plurality of protrusions (506) are disposed on the outer top surface of the plurality of cell holders and between each of the plurality of conduits (502, 504). Further, the plurality of protrusions (506) are configured to restrict movement of the one or more interconnectors (206, 214) which will reduce the chances of failure of the power unit assembly (100).

[00058] In one of the embodiments of the present application, the plurality of cells (210) which are connected in one row is of one polarity and are in parallel connection, accordingly, the entire row is of one polarity. For example, a first row which is comprising the second group of cells and are disposed within the second group of conduits (502). Further, the first row is of the second dimension and are holding the plurality of cells (210) which are of negative polarity. Accordingly, the combined polarity for that first row will be negative only. Similarly, a second row which is comprising the first group of cells and are disposed within the first group of conduits (504). Furthermore, the second row is of the first dimension and are holding the plurality of cells (210) of positive polarity. Accordingly, the combined polarity for that second row will be positive only. Moreover, the entire first row of combined negative polarity will be in a series connection with the entire second row of combined positive polarity.

[00059] The aforesaid configuration will provide one benefit over the solution available in the art is that it will provide more area for the gap filler material such as Phase Change Material (PCM) or the like to be in contact with cell surface of the plurality of cells (210) and battery casing. Accordingly, the present configuration is able to dissipate large amount of heat in comparison to the solutions available in the art. Further, the present configuration will also reduce the chances of thermal runaway. The configuration is designed in such a way that after increase the dimensions of the plurality of conduits (502, 504) we are not required to decrease the number of cells. Furthermore, the present solution also allows the plurality of cells (210) to charge discharge at higher C rates and makes it safe to use in operational condition and it will reduce part weight.

[00060] The present subject matter relates to heat transfer from a battery pack. With the implementations of the present subject matter, heat generated by the plurality of cells of the battery pack can be efficiently dissipated from the battery pack, thereby, the thermal runaway can be eliminated. Accordingly, the plurality of cells thermally efficient and electrically safe.

[00061] In the present invention, the plurality of cells of the power unit assembly will have more contact area with the layer of thermal interface material at the negative polarity of the plurality of cells which will improve cooling of the plurality of cells.

[00062] In view of the above, the steps as discussed above are not routine, conventional, or well understood in the art, as the claimed steps enable the following solutions to the existing problems in conventional technologies.

[00063] The above-described embodiments, and particularly any “preferred” embodiments, are possible examples of implementations and merely set forth for a clear understanding of the principles of the invention. It will be apparent to those skilled in the art that changes in form, connection, and detail may be made therein without departing from the spirit and scope of the invention.

[00064] Non-limiting and non-exhaustive embodiments of the invention are described with reference to the following figures, wherein like reference numerals refer to like parts throughout the various views unless otherwise specified. It should be appreciated that the following figures may not be drawn to scale.

[00065] The foregoing disclosure is not intended to limit the present disclosure to the precise forms or particular fields of use disclosed. As such, it is contemplated that various alternate embodiments and/or modifications to the present disclosure, whether explicitly described or implied herein, are possible in light of the disclosure. Having thus described embodiments of the present disclosure, a person of ordinary skill in the art will recognize that changes may be made in form and detail without departing from the scope of the present disclosure. Therefore, it is intended that the present invention not be limited to the particular embodiment disclosed, but that the present invention will include all embodiments falling within the scope of the appended claims.

[00066] In the foregoing specification, the disclosure has been described with reference to specific embodiments. However, as one skilled in the art will appreciate, various embodiments disclosed herein can be modified or otherwise implemented in various other ways without departing from scope of the disclosure. Accordingly, this description is to be considered as illustrative and is for the purpose of teaching those skilled in the art the manner of making and using various embodiments of the disclosure. It is to be understood that the forms of disclosure herein shown and described are to be taken as representative embodiments. Equivalent elements, materials, processes or steps may be substituted for those representatively illustrated and described herein. Moreover, certain features of the disclosure may be utilized independently of the use of other features, all as would be apparent to one skilled in the art after having the benefit of this description of the disclosure. Expressions such as “including”, “comprising”, “incorporating”, “consisting of”, “have”, “is” used to describe and claim the present disclosure are intended to be construed in a non-exclusive manner, namely allowing for items, components or elements not explicitly described also to be present. Reference to the singular is also to be construed to relate to the plural.
, Claims:1. A power unit assembly (100) comprising:
a plurality of cells (210), the plurality of cells (210) comprising a first group of cells and a second group of cells; and
a plurality of cell holders, the plurality of cell holders comprising a plurality of conduits (502, 504), wherein the plurality of conduits configured to receive the plurality of cells (210), and wherein the plurality of conduits (502, 504) comprising a first group of conduits (504) and a second group of conduits (502),
wherein the first group of conduits (504) having a first dimension and the second group of conduits (502) having a second dimension, and
wherein the second dimension of the second group of conduits (502) being greater than the first dimension of the first group of conduits (504).

2. The power unit assembly (100) as claimed in claim 1, wherein the plurality of cells (210) being in an electrical connection.

3. The power unit assembly (100) as claimed in claim 1, wherein the first group of cells being disposed within the first group of conduits (504) such that a negative terminal of each of the first group of cells being facing a casing bottom (104) of the power unit assembly (100) and a positive terminal being facing a casing top (102) of the power unit assembly (100).

4. The power unit assembly (100) as claimed in claim 1, wherein the second group of cells being disposed within the second group of conduits (504) such that the negative terminal of each of the first group of cells being facing the casing top (102) of the power unit assembly (100) and the positive terminal being facing the casing bottom (104) of the power unit assembly (100).

5. The power unit assembly (100) as claimed in claim 3, wherein the casing top (102) and the casing bottom (104) being parts of a casing of the power unit assembly (100),
wherein the casing top (102) and the casing bottom (104) being placed opposite to each other, and
wherein the casing top (102) and the casing bottom (104) being connected with each other to form the casing of the power unit assembly (100).

6. The power unit assembly (100) as claimed in claim 5, wherein the casing being made of a thermally conductive material and an electrically insulating material.

7. The power unit assembly (100) as claimed in claim 1, wherein the first dimension of the first group of conduits (504) and the second dimension of the second group of conduits (502) being corresponds to shape of the first group of cells and to the second group of cells.

8. The power unit assembly (100) as claimed in claim 1, wherein the first group of cells being disposed in the plurality of cell holder at a predefined distance from the second group of cells.

9. The power unit assembly (100) as claimed in claim 1, wherein each of the plurality of cells (210) being disposed coaxially with the plurality of conduits (502, 504).

10. The power unit assembly (100) as claimed in claim 1, wherein the power unit assembly (100) comprises one or more interconnectors (206, 214).

11. The power unit assembly (100) as claimed in claim 1, wherein the power unit assembly (100) comprises at least one layer of Thermal Interface Material (TIM) (204, 216), and
wherein the at least one layer of TIM (204, 216) being connected from an inner side with the casing top (102) and the casing bottom (104).

12. The power unit assembly (100) as claimed in claim 11, wherein the at least one layer of TIM (204, 216) being disposed between the casing top (102) and the one or more interconnectors (206, 214).

13. The power unit assembly (100) as claimed in claim 11, wherein the at least one layer of TIM (204, 216) being disposed between the casing bottom (104) and the one or more interconnectors (206, 214).

14. The power unit assembly (100) as claimed in claim 5, wherein the casing comprises a plurality of heat dissipating fins (106), and
wherein the plurality of heat dissipating fins (106) being disposed on an outer surface of the casing top (102) and the casing bottom (104).

15. The power unit assembly (100) as claimed in claim 1, wherein the power unit assembly (100) corresponds to at least one battery.

16. The power unit assembly (100) as claimed in claim 1, wherein the power unit assembly (100) comprises Phase Change Material (PCM), and
wherein the PCM material being filled in the plurality of conduits (502, 504).

17. The power unit assembly (100) as claimed in claim 16, wherein the second group of conduits (502) comprises more PCM material than the first group of conduits (502).

18. The power unit assembly (100) as claimed in claim 10, wherein the plurality of cell holders comprises a plurality of protrusions (506) being disposed on an outer top surface of the plurality of cell holders and between each of the plurality of conduits (502, 504), and
wherein the plurality of protrusions (506) being configured to restrict movement of the one or more interconnectors (206, 214).

19. The power unit assembly (100) as claimed in claim 1, wherein the plurality of cell holders comprises of a cell holder top (208) and a cell holder bottom (212), and
wherein the cell holder top (208) and the cell holder bottom (212) being connected to each other at edges.

20. The power unit assembly (100) as claimed in claim 1, wherein the first dimension and the second dimension correspond to a width of the first group of conduits (504) and second group of conduits (502).

21. The power unit assembly (100) as claimed in claim 1, wherein the first dimension and the second dimension correspond to a diameter of the first group of conduits (504) and second group of conduits (502).