DESC:TECHNICAL FIELD
[0001] The present invention relates to a battery pack of a vehicle. More particularly, the present invention relates to a cell holder in a battery pack for a vehicle thereof.

BACKGROUND
[0002] In recent times there is an increased demand to control emissions from automobiles, in view of stringent emission norms. As a result, a number of hybrid and electric vehicles are seeing the light of the day in order to minimize the amount of emissions. Typically, hybrid vehicles have distinct advantage of allowing longer travel, as at least one source is always available to drive the vehicle. Hence, there is low risk of running out of fuel or getting stranded as it may happen with a traditional internal combustion powered vehicle.
[0003] Hybrid vehicles which are configured to be powered either by an internal combustion engine or electric motor or both are off-late replacing normal engine powered vehicles. In the Hybrid vehicles, an internal combustion engine can be used for driving on terrain or for long distances and electric propulsion system can be used for the shorter distances. However, incorporation of both internal combustion engine and electric motor assembly in the hybrid vehicle and especially in a two-wheeled vehicle makes the system bulky and more complex.
[0004] Thus, electric vehicles have gained popularity in recent years as the potential replacement for internal combustion vehicles, since they promise zero emission from electric drive system, and a break away from oil dependency. Hence, a focus of the electric vehicle industry in battery research is directed to rechargeable batteries, such as sealed, starved electrolyte, lead/acid batteries, are commonly used as power sources in vehicles and the like. However, lead-acid batteries are heavy, bulky, and have short cycle life, short calendar life, and low turn around efficiency. Hence, a pure electric vehicle entails a problem in that its own weight increases. Also, the traveling distance for a pure electric vehicle is short, and due to packaging constraints, it is difficult to mount one or more batteries as an additional rechargeable back-up power source. The limited spaces of the vehicle and further structural challenges for installing said one or more additional batteries thereon is another constraint with pure electric vehicles.
[0005] In order to overcome problems associated with said conventional battery packs including the lead-acid batteries for the vehicle, a lithium-ion battery cell provides an ideal system for high energy-density applications, improved rate capability, and safety. Further, the rechargeable battery packs like lithium-ion batteries exhibit characteristics such as flexibility, solid components and more which makes it useable on the vehicle. First, for safety reasons, the lithium-ion battery is constructed of all solid components while still being flexible and compact. Secondly, the battery packs including the lithium-ion battery exhibits similar conductivity characteristics to primary batteries with liquid electrolytes, i.e., deliver high power and energy density with low rates of self-discharge. Thirdly, the battery packs with lithium-ion battery are readily manufacturable in a manner that it is both reliable and cost-efficient. Finally, the battery packs including the lithium-ion battery is able to maintain a necessary minimum level of conductivity at sub-ambient temperatures.
[0006] In a known structure for a battery pack, the battery pack including lithium-ion battery cells are disposed in at least one cell holder assembly in series and /or parallel combinations. Generally, the interconnect members are adapted for electrically interconnecting at least one array of the battery cells being disposed in said at least one battery pack. Particularly, each of the interconnect members and at least one of the battery cells are made of dissimilar materials. Further, the interconnecting plates includes metal plate made up of steel and the battery cell terminals are made of nickel. However, nickel is not as good as a conductor as steel. Hence in the known structure, the interconnecting plates including metal plates having high thermal and electrical conductivity are electrically connected to at least one terminal of each of the battery cells through a spot-welding method having at least one contact point.

BRIEF DESCRIPTION OF DRAWINGS
[0007] The detailed description is described with reference to the accompanying figures, which is related to a battery pack in a vehicle being one embodiment of the present subject matter. However, the present subject matter is not limited to the depicted embodiment(s) and is applicable to all kinds of battery packs in vehicles such as two-wheeled vehicle, three-wheeled vehicle, four-wheeled vehicle and the like. In the figures, the same or similar numbers are used throughout to reference features and components.
[0008] Fig. 1 depicts an isometric view of a battery pack in accordance with an embodiment of the present subject matter.
[0009] Fig. 2 illustrates an exploded view of the battery pack in accordance with an embodiment of the present subject matter.
[00010] Fig. 3 illustrates a top view of the battery pack and zoomed view of the single cell pocket with stopper in accordance with an embodiment of the present subject matter.
[00011] Fig. 4 illustrates a bottom view of the battery pack in accordance with an embodiment of the present subject matter.
[00012] Fig. 5 illustrates a top view of a top plate of a cell holder having circular shaped holes for placing the cell from top in accordance with an embodiment of the present subject matter.
[00013] Fig. 6 illustrates a top view of an insulation sheet with the provision for one or more interconnectors and a stopper in accordance with an embodiment of the present subject matter.
[00014] Fig. 7 illustrates a top view of a bottom plate of the cell holder with a stopper in accordance with an embodiment of the present subject matter.
[00015] Fig. 8 illustrates top view of signal interconnector in accordance with an embodiment of the present subject matter.
[00016] Fig. 8(a) illustrates an exploded view of the signal interconnector with the provision for gap filling with a phase change material in accordance with an embodiment of the present subject matter.
[00017] Fig. 8(b) illustrates a side view of the signal interconnector with the provision for gap filling with a phase-change material in accordance with an embodiment of the present subject matter.
[00018] Fig. 9(a) illustrates a top view of the power interconnector with the provision for gap filling with a phase-change material in accordance with an embodiment of the present subject matter.
[00019] Fig. 9(b) illustrates an exploded view of the power interconnector with the provision for gap filling with a phase-change material in accordance with an embodiment of the present subject matter.
[00020] Fig. 10 illustrates a new method of assembly of battery pack in accordance with an embodiment of the present subject matter.
DETAILED DESCRIPTION
[00021] Various features and embodiments of the present subject matter here will be discernible from the following further description thereof, set out hereunder. In a typical design for a cell holder in a battery pack, the cell holder comprises a top cell holder, a bottom cell holder, one or more interconnect members having one or more slits integrally formed in at least a portion thereof. The one or more slits comprises at least one electrode structure configured to form at least one contact joint with at least one terminal of each of said one or more battery cells through the spot welding.
[00022] In order to obtain desired power from the battery pack, numerous lithium-ion cells are interconnected in series and parallel configuration. Conventionally, the interconnect members are usually made using copper and nickel joined together by various methods such laser and spot-welding means combined with plastic parts such as plastic cell holders. Typically, battery cells are firstly placed in the bottom cell holder. The top cell holder then covers the battery cells from the top. Interconnectors are placed on either top or below the top cell holder and bottom cell holder post which welding is performed so that the battery cells are placed accurately inside the cell holder. The battery cells are placed in the cell holders in such a manner that required cell spacing and proper alignment of the cells is taken care of to avoid short circuit of battery cells with each other.
[00023] However, such conventional method of assembling of battery cells inside the battery pack poses numerous challenges in terms of complex assembly and increased chances of short circuit between the battery cells. While the battery cells are placed inside the bottom cell holder, it becomes a challenge while assembling the top cell holder at the top of the battery cells. There are high chances of misalignment of battery cells with the top cell holder, thereby resulting into problems in assembly and decreased manufacturability. Moreover, during welding while assembly, if the positive and negative terminals of two battery cells come in contact with each other, there is a possibility for short circuit since the battery cells are non-insulated and the entire portion of the battery cells is exposed during welding.
[00024] Moreover, during the time of short circuit, where positive and negative terminals of the cell come in contact, it may cause severe damage to the cells, thereby resulting into battery pack either catching fire or posing the risk of thermal runaway, causing harm to the rider. Thus, it becomes essential to disconnect the cell from the battery pack at the time of short circuit.
[00025] Thus, there is a need for an improved cell holder which enables easy manufacturability and improved assembly sequence, prevents the problem of short circuit while assembling and which can overcome all the above problems & other problems in known art.
[00026] Thus, the present subject matter aims to provide a battery pack with an improved cell holder that prevents the problem of short circuiting while assembling such battery pack.
[00027] It is further an objective of the present subject matter to prevent the chances of thermal runaway in the battery pack.
[00028] It is another objective of the present subject matter to enable easy manufacturability of the battery pack and provide improved assembly sequence to prevent mis-alignment of cells while placing in the battery pack.
[00029] Thus, the present subject matter discloses a battery pack comprising a cell holder for holding one or more battery cells, said cell holder includes one or more plates, wherein each of said one or more plates being configured to have one or more circular shaped holes for holding said one or more battery cells from one or more sides of one or more battery cells. The battery pack further comprises one or more interconnectors. The interconnectors are used to electrically connect said one or more battery cells. The battery pack further comprises one or more insulation sheets positioned on a top portion of said the holder. Herein, the one or more insulation sheets includes one or more circular shaped holes. The one or more insulation sheets further has a stopper disposed within said one or more circular shaped holes. The stopper can facilitate contact of said one or more interconnector with a negative terminal and a positive terminal of the one or more battery cells. The stopper can prevent contact of said one or more interconnector with portions other than the negative terminal and the positive terminal to avoid short circuit during assembly of the battery pack.
[00030] In another embodiment, the one or more interconnectors include a power interconnector and a signal interconnector.
[00031] In yet another embodiment, the one or more interconnectors includes a single row interconnector and a dual row interconnector.
[00032] In another embodiment, the power interconnector and said signal interconnector are made of a combination of nickel and copper.
[00033] In another embodiment, the one or more plates includes a top plate and a bottom plate.
[00034] In another embodiment, the one or more insulation sheets has one or more provisions for holding said interconnectors.
[00035] In yet another embodiment, the one or more insulation sheet being placed in a bottom portion of said cell holder, said one or more insulation sheet being placed between said one or more plates and said one or more interconnectors.
[00036] In another embodiment, the top plate includes a circular shaped hole for inserting one or more battery cells from a top portion within said battery pack and said bottom plate includes a circular shaped hole for holding one or more battery cells.
[00037] In yet another embodiment, the circular shaped hole of said bottom plate includes a stopper, said stopper being disposed within a depression formed in said circular shaped hole.
[00038] In another embodiment, the circular shaped hole of the bottom plate being lesser in size as that of said circular shaped hole of the top plate to hold one or more battery cells being inserted from said top plate.
[00039] In yet another embodiment, the one or more interconnectors includes a gap for filling a phase-change material through a channel disposed within said one or more interconnectors, wherein said phase-change material being capable of enhancing thermal conductivity of said battery pack.
[00040] In another embodiment, the one or more interconnectors includes an extended L-bent provision for welding said one or more interconnectors with said cell holder.
[00041] In another embodiment, the top plate includes one or more extending arms on one or more sides of said top plate and said bottom plate includes one or more extending arms on one or more sides of said bottom plate.
[00042] The present subject matter further discloses a method for assembling a battery pack comprising the steps of placing one or more interconnectors at a bottom portion of said battery pack, disposing a cell holder on top of said one or more interconnectors, said cell holder includes a top plate and a bottom plate, inserting one or more battery cells inside said cell holder from top through one or more circular holes of said top plate to securely place said one or more battery cells within one or more circular holes of said bottom plate to hold said one or more battery cells, arranging one or more insulation sheets on top of said cell holder, placing one or more interconnectors at a top of said one or more insulation sheets, said interconnectors being fastened to said one or more insulation sheets through one or more fasteners and welding said interconnectors with said cell holder to assemble said battery pack. The method for assembling said battery pack enables assembling of said one or more battery cells securely inside said battery pack by placing one or more battery cells inside said one or more circular holes inside said cell holder, thereby preventing mis-alignment of said one or more battery cells while assembling said battery pack.
[00043] In another embodiment, disposing a cell holder on top of said one or more interconnectors includes disposing said bottom plate on top of said one or more interconnectors.
[00044] In another embodiment, arranging one or more insulation sheets on top of said cell holder includes arranging one or more insulation sheets on top of said top plate of said cell holder.
[00045] In yet another embodiment, enclosing said one or more extending arms of said bottom plate by one or more extending arms of said top plate to securely hold a cell holder.
[00046] In yet another embodiment, the one or more circular holes of said bottom plate includes a stopper to prevent short circuit between said one or more battery cells and said one or more interconnectors.
[00047] In another embodiment, placing said one or more interconnectors at top of one or more insulation sheets includes placing said one or more interconnectors being in contact with a stopper of said one or more insulation sheets.
[00048] The present subject matter is further described with reference to accompanying figures. 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.
[00049] The battery pack may be implemented in any type of electric and hybrid electric vehicle which is using battery pack as a power source. However, for the purpose of explanation and by no limitation, the battery pack, and corresponding additional advantages and features are described through the following embodiments.
[00050] Referring to Fig. 1 and Fig. 2, which illustrates, and isometric view of a battery pack (100) and an exploded view of the battery pack (100) are described hereinafter. A battery pack (100) comprises a cell holder (105) having a top plate (110) and a bottom plate (112). One or more battery cells (120) are placed between the top plate (110) and the bottom plate (112). One or more interconnectors (210a, 215a) are placed below the bottom plate (112). An insulation sheet (205) is placed above top plate (110). One or more interconnectors (210a, 210b and 215b) are placed above the insulation sheet (205). Herein, the one or more interconnector (210a) is a dual row interconnector, and one or more interconnector (210b) is a single row interconnector.
[00051] The battery pack (100) is charged through a charger. The charger consists of two end covers, one PCB, two connectors, one extruded aluminium casing and one switch assembly. The switch assembly is installed with one side of end cover in electric vehicle charger to operate the power supply for battery. The magnetic switch assembly is assembled on an end cover and it will be installed on the charger. In a magnetic switch assembly, one permanent magnet will be fitted with plastic holder and two clips were provided for tight sliding. Functionally, the permanent magnet is creating magnetic field when it goes near to the reed switch. So, that the circuit will be closed. After that, if the magnetic switch moved away from the attraction of reed switch, the circuit will be opened. Here, reed switch is called as electrical switch, which is operating by an applied magnetic field. This will be soldered on PCB to operate the charger by giving signal like ON or OFF in binary method of input. According to the signal type, charger will charge and discharge the battery perfectly without any error.
[00052] Referring to Fig. 3 which depicts a top view of the battery pack (100) describes the arrangement of the top plate (not shown), insulation sheet (205), wherein the insulation sheet (205) has one or more stoppers (300) to prevent the contact between interconnectors and either a negative or positive terminal of said one or more cells (120), to avoid short circuit while assembling the cells (120) inside the cell holder (205). One or more interconnectors (210a, 210b, 215b) are arranged over the insulation sheet (205). Referring to Fig. 4, which illustrates a bottom view of the battery pack (100), describes a bottom view wherein one or more interconnectors (210a, 215a) are being placed on the bottom of the bottom plate (112). The interconnectors (210a, 210b, 215a, 215b) is used to electrically connect the one or more cells (120).
[00053] Referring to Fig. 5, which illustrates a top view of the top plate (110) describes one or more circular shaped holes (505) through which one or more cells (120) are being inserted inside the cell holder (205). The top plate (110) includes one or more extending arms (500) to enclose corresponding one or more arms of the bottom plate (not shown). Referring to Fig. 6, which illustrates a top view of the insulation sheet (205) describes the insulation sheet (205) having one or more provisions (610) for placing the one or more interconnectors (210a, 210b, 215a, 215b) and the insulation sheets (205) comprises a stopper (300) disposed inside a depression formed in one or more circular shaped holes (600). Such circular shaped holes (600) enable the contact between the one or more interconnectors (210a, 210b, 215a, 215b) and the positive or negative terminal of one or more battery cells (120) and the stopper (300) prevents the contact of the one or more interconnectors (210a, 210b, 215a, 215b) with any other part of the one or more battery cells (120).
[00054] Referring to Fig.7, wherein a top view of the bottom plate (112) of the cell holder (205) is being provided. The bottom plate (112) has one or more extending arms (700) which is enclosed by the one or more extending arms of the top plate (not shown). The bottom plate (112) further comprises one or more circular shaped holes (710) with the circular shaped holes (710) having a stopper (300) formed in a depression in the one or more circular shaped holes (710). Herein, the stopper (300) has the same function of preventing contact of one or more interconnectors (210a, 210b, 215a, 215b) with any other part of the one or more battery cells to avoid short circuit of the battery pack (100).
[00055] Referring to Fig. 8, Fig. 8 (a) and Fig. 8(b), which illustrates a top view of signal interconnector (210a), an exploded view of the signal interconnector (210a) and a side view of the signal interconnector (210a), describes that the signal interconnector (210a) has a channel (805) for filling a phase-change material to prevent thermal runaway in the battery pack (100). This phase-change material is filled in the channel (805) through a gap (810) between the one or more interconnectors (215b, 210a).
[00056] Referring to Fig. 9(a) and 9(b) which illustrates a power interconnector (215b, 210b) having a provision (805) for filling the phase change material inside the power interconnectors (215b, 210b) through a gap (810) between the one or more power interconnectors (215b, 210b). This phase change material prevents thermal runaway from the battery pack (100).
[00057] Therefore, the present subject matter discloses a cell holder (205) that has provisions (610) for holding the power interconnectors (210b, 215b) and the signal interconnector (210a, 215a) and has a stopper (300) to avoid the short circuit in the one or more battery cells (120) due to welding between one or more battery cells (300) and the one or more interconnectors (210a, 210b, 215a, 215b). The interconnectors (210a, 210b, 215a, 215b) have an extended L-bent provision (not shown) for welding. So that, it will not foul with stopper (300) which is in the cell holder (205). The stopper (300) is necessary, so that one or more interconnectors (210a, 210b, 215a, 215b) will be in contact only with the required terminal and not with any other part of the battery cells (120). If the stopper (300) is not there, there may be a chance for one or more interconnectors (210a, 210b, 215a, 215b) to touch the one or more battery cells (120) negative terminal during assembly as well as during vibration due to the vehicle movement. This will create a potential damage to the battery pack (100).
[00058] Referring to Fig. 10, which illustrates a new method of assembly of the battery pack (100). The method comprising the steps of placing one or more interconnectors (210a, 215a) at a bottom portion of said battery pack (100), disposing a cell holder (105) on top of said one or more interconnectors (210a, 215a), said cell holder (205) includes a top plate (110) and a bottom plate (112), inserting one or more battery cells (120) inside said cell holder (105) from top through one or more circular holes (505) of said top plate (110) to securely place said one or more battery cells (120) within one or more circular holes (700) of said bottom plate (112) to hold said one or more battery cells (120), arranging one or more insulation sheets (205) on top of said cell holder (105), placing one or more interconnectors (210a, 210b, 215b) at a top of said one or more insulation sheets (205), said interconnectors (210a, 210b, 215b) being fastened to said one or more insulation sheets (205) through one or more fasteners and welding said interconnectors (210a, 210b, 215b) with said cell holder (105) to assemble said battery pack (100).
[00059] The method for assembling said battery pack (100) enables assembling of said one or more battery cells (120) securely inside said battery pack (100) by placing one or more battery cells (120) inside said one or more circular holes (505, 700) inside said cell holder (105), thereby preventing mis-alignment of said one or more battery cells (120) while assembling said battery pack (100).
[00060] Herein, disposing a cell holder (105) on top of said one or more interconnectors (210a, 215a) includes disposing said bottom plate (112) on top of said one or more interconnectors (210a, 215a). Further, arranging one or more insulation sheets (205) on top of said cell holder (105) includes arranging one or more insulation sheets (205) on top of said top plate (112) of said cell holder (105). Also, enclosing said one or more extending arms (700) of said bottom plate (112) by one or more extending arms (505) of said top plate (110) to securely hold the cell holder (105).
[00061] Further, the one or more circular holes (710) of said bottom plate (112) includes a stopper (300) to prevent short circuit between said one or more battery cells (120) and said one or more interconnectors (210a, 215a).
[00062] Moreover, placing said one or more interconnectors (210a, 210b, 215b) at top of one or more insulation sheets (205) includes placing said one or more interconnectors (210a, 210b, 215b) being in contact with a stopper (300) of said one or more insulation sheets (205).
[00063] Thus, arranging/ assembling the cells (120) in an appropriate location will be easy. There will not be any assembly issue while placing the top cell holder plate (110). The one or more battery cells (120) are placed after assembling the bottom plate (112) and the top plate (110) of the cell holder (105). Thus, the one or more battery cells (120) are placed in an appropriate cell pocket or circular shaped holes (505, 710) through the circular shaped holes (505) in the top plate (110). So that, the existing difficulty in the prior art, while placing the top plate (110) on top of the one or more battery cells (120) can be avoided.
[00064] While certain features of the claimed subject matter have been illustrated and described herein, many modifications, substitutions, changes, and equivalents will now occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes that fall within the true spirit of the claimed subject matter.

List of reference signs:
100 battery pack assembly
105 cell holder
110 top plate
112 bottom plate
120 battery cells
205 insulation sheet
210a nickel plate for signal interconnector
210b nickel plate for power interconnector
215a copper plate for signal interconnector
215b copper plate for power interconnector
300 stopper
500 pair of arms of top plate
505 circular shaped holes in top plate
600 circular shaped holes in insulation sheet
610 provision for interconnectors
700 pair of arms of bottom plate
710 circular shaped holes in bottom plate
805 channel
810 gap

,CLAIMS:We claim:
1. A battery pack (100) comprising:
a cell holder (105) for holding one or more battery cells (120), said cell holder (105) includes:
one or more plate members (110, 112), wherein each of said one or more plate members (110, 112) being configured to have one or more circular shaped holes (505, 710) for holding said one or more battery cells (120) from one or more sides of one or more battery cells (120),
one or more interconnectors (210a, 210b, 215a, 215b), wherein said one or more interconnectors (210a, 210b, 215a, 215b) being used to electrically connect said one or more battery cells (120); and
one or more insulation sheets (205), wherein said one or more insulation sheets (205) being positioned on a top portion of said cell holder (105), and said one or more insulation sheets (205) includes one or more circular shaped holes (600);
wherein said one or more insulation sheets (205) being configured to have a stopper (300) disposed within said one or more circular shaped holes (600);
wherein said stopper (300) being capable of facilitating contact of said one or more interconnector (210a, 210b, 215a, 215b) with one of a negative terminal and a positive terminal of said one or more battery cells (120); and
wherein said stopper (300) being capable of preventing contact of said one or more interconnector (210a, 210b, 215a, 215b) with portions other than said negative terminal and said positive terminal to avoid short circuit during assembly of the battery pack (100).

2. The battery pack (100) as claimed in Claim 1, wherein said one or more interconnectors (210a, 210b, 215a, 215b) include a power interconnector (210b, 215b) and a signal interconnector (210a, 210b).
3. The battery pack (100) as claimed in Claim 2, wherein said one or more interconnectors includes a single row interconnector (210b) and a dual row interconnector (210a).
4. The battery pack (100) as claimed in Claim 2, wherein said power interconnector (210b, 215b) and said signal interconnector (210a, 210b) being made of a combination of nickel and copper.
5. The battery pack (100) as claimed in Claim 1, wherein said one or more plate members (110,112) includes a top plate (110) and a bottom plate (112).
6. The battery pack (100) as claimed in Claim 1, wherein said one or more insulation sheets (205) has one or more provisions (610) for holding said interconnectors (210a, 210b, 215a, 215b).
7. The battery pack (100) as claimed in Claim 1, wherein said one or more insulation sheet (205) being placed in a bottom portion of said cell holder (105), said one or more insulation sheet (205) being placed between said one or more plates (112) and said one or more interconnectors (210a, 215a).
8. The battery pack (100) as claimed in Claim 2, wherein said top plate (110) includes a circular shaped hole (505) for inserting one or more battery cells from a top portion within said battery pack (100) and said bottom plate (120) includes a circular shaped hole (710) for holding one or more battery cells (120).
9. The battery pack (100) as claimed in Claim 8, wherein said circular shaped hole (710) of said bottom plate (112) includes a stopper (300), said stopper (300) being disposed within a depression formed in said circular shaped hole (710).
10. The battery pack (100) as claimed in Claim 8, wherein said circular shaped hole (710) of said bottom plate (112) being lesser in size as that of said circular shaped hole (505) of said top plate (110) to hold one or more battery cells (120) being inserted from said top plate (110).
11. The battery pack (100) as claimed in Claim 1, wherein said one or more interconnectors (210a, 210b, 215a, 215b) includes a gap (810) for filling a phase-change material through a channel (805) disposed within said one or more interconnectors (210a, 210b, 215a, 215b), wherein said phase-change material being capable of enhancing thermal conductivity of said battery pack (100).
12. The battery pack (100) as claimed in Claim 1, wherein said one or more interconnectors (210a, 210b) includes an extended L-bent provision for welding said one or more interconnectors (210a, 210b) with said cell holder (105).
13. The battery pack (100) as claimed in Claim 2, wherein said top plate (110) includes one or more extending arms (500) on one or more sides of said top plate (110) and said bottom plate (112) includes one or more extending arms (700) on one or more sides of said bottom plate (112).
14. A method for assembling a battery pack (100), said method comprising the steps of:

placing one or more interconnectors (210a, 215a) at a bottom portion of said battery pack (100);

disposing a cell holder (105) on top of said one or more interconnectors (210a, 215a), said cell holder (105) includes a top plate (110) and a bottom plate (112);

inserting one or more battery cells (120) inside said cell holder (105) from top through one or more circular holes (505) of said top plate (110) to securely place said one or more battery cells (120) within one or more circular holes (710) of said bottom plate (112) to hold said one or more battery cells (120);

arranging one or more insulation sheets (205) on top of said cell holder (105);

placing one or more interconnectors (210a, 210b, 215b) at a top of said one or more insulation sheets (205), said interconnectors (210a, 210b, 215b) being fastened to said one or more insulation sheets (205) through one or more fasteners; and

welding said interconnectors (210a, 210b, 215b) with said cell holder (105) to assemble said battery pack (100);

wherein said method for assembling said battery pack enables assembling of said one or more battery cells (120) securely inside said battery pack (100) by placing one or more battery cells (120) inside said one or more circular holes (505,710) inside said cell holder (105), thereby preventing mis-alignment of said one or more battery cells (120) while assembling said battery pack (120).

15. The method of assembling said battery pack (100) as claimed in Claim 14, said disposing a cell holder (105) on top of said one or more interconnectors (210a, 215a) includes disposing said bottom plate member (112) on top of said one or more interconnectors (210a, 215a).

16. The method of assembling said battery pack (100) as claimed in Claim 14, wherein arranging one or more insulation sheets (205) on top of said cell holder (105) includes arranging one or more insulation sheets (205) on top of said top plate (110) of said cell holder (105).
17. The method of assembling said battery pack (100) as claimed in Claim 14, includes enclosing said one or more extending arms (700) of said bottom plate member (112) by one or more extending arms (505) of said top plate member (110) to securely hold a cell holder (105).
18. The method of assembling said battery pack (100) as claimed in Claim 14, wherein said one or more circular holes (710) of said bottom plate (112) includes a stopper (300) to prevent short circuit between said one or more battery cells (120) and said one or more interconnectors (210a, 210b, 215a, 215b).
19. The method of assembling said battery pack (100) as claimed in Claim 14, wherein placing said one or more interconnectors (210a, 210b, 215a, 215b) at top of one or more insulation sheets (205) includes placing said one or more interconnectors (210a, 210b, 215a, 215b) being in contact with a stopper (300) of said one or more insulation sheets (205).