Energy storage unit

Abstract

The present invention relates to an energy storage unit (100). The energy storage unit (100) comprises a plurality of cells (102). The energy storage unit 100 comprises a holder member (104), which is a planar body with a predetermined thickness (T). Each holder member (104) comprises a plurality of receptacles (106). Each of the receptacle (106) is configured to accommodate any one of a first end (102A) and a second end (102B) of a cell of the plurality of cells (102). The holder member (104) comprises a pair of mounting provisions (108, 110) disposed on a peripheral edge (E) of the planar body. The pair of mounting provisions (108, 110) comprises a first mounting provision (108) configured to connect with one or more connecting members (112) and a second mounting provision (110) configured to connect with an electronic board (114) of the energy storage unit (100).

Description

[0001] FIELD OF THE INVENTION

[0002]

[0001] Present invention relates to an energy storage unit of a vehicle.

[0003] BACKGROUND OF THE INVENTION

[0004]

[0002] In existing vehicle layouts, 12V battery packs present in internal combustion engine vehicles achieves the functions of supplying power to the spark plug of the engine for initiating combustion and sustenance of basing electrical operations such as head lamp, horn, tail lamp, etc. Traditionally, the battery pack used is of Lead- Acid kind owing to the high-power density of the Lead Acid. Lead acid battery packs are typically pouch cells which do not need a cell holder or casing, and they are easy to handle. With the usage of lead acid battery, the disadvantages are heavier weight of the battery pack, and reduced durability or life cycle of the battery pack. Thus, it is a necessity to replace the lead acid batteries in 2-wheeler vehicle by a rechargeable 12 V lithium-ion battery to enhance the performance of the vehicle as per requirements. Furthermore, the limitations of the lead acid battery are no signal tapping provision was given on the cell holder to carry current / voltage readings to the BMS from cells, cell holders do not have groves to hold the interconnectors. On the other hand, the lithium-ion cells have a high energy density which permits a longer life cycle. To suit the power density requirements of the lead acid, the lithium ion is used in 4S2P (4 cells in series and 2 in parallel) configuration.

[0003] The disadvantages of existing prior arts include, but not limited to, there is no signal tapping provision given on the cell holder to carry current / voltage readings to the BMS from cells. Since tapping provision was not given, the signal wires were directly soldered on the interconnector and the BMS, therefore increasing the resistance of the pack and thereby decreasing the performance of the pack significantly.

[0005]

[0004] Existing cell holders do not have grooves to hold the interconnectors. The cell holders with no grooves to align interconnectors could lead to float of the interconnectors and therefore leading to short circuit of the cells which is safety critical for the customer. In earlier arrangements of Li-ion cells, there are floating connectors, where the interconnector typically extrudes over the cell tapping surfaces are not typically securely seated. A disadvantage of the same is that during solder / laser welding there are chances of movement of the interconnector leading to an incorrect electrical connection.

[0006]

[0005] Additionally, in case the movement of the floating interconnector exposes the cell surface, the laser weld may accidently puncture the cell. Further, since lead acid batteries are typically pouch cell batteries there was no requirement of a cell holder. Instead, wires were used to directly connect the cell modules to an output. The wire connections are subjected to wear and tear and do not have as high a transmission efficiency as metal plates or interconnectors.

[0006] Thus, there is a need in the art to overcome the aforesaid problems by providing an energy storage unit of a vehicle that addresses these problems.

[0007] SUMMARY OF THE INVENTION

[0008]

[0007] In one aspect, the present invention is directed to an energy storage unit. The energy storage unit comprises a plurality of cells. The plurality of cells comprises a first end and a second end. The energy storage unit comprises at least one holder member. The at least one holder member is a planar body with a predetermined thickness. Each holder member comprises a plurality of receptacles. Each of the receptacle is configured to accommodate any one of the first end and the second end of a cell of the plurality of cells. The holder member further comprises a pair of mounting provisions disposed on a peripheral edge of the planar body. The pair of mounting provisions comprises a first mounting provision which is configured to connect with one or more connecting members and a second mounting provision is configured to connect with an electronic board of the energy storage unit.

[0009]

[0008] In an embodiment, the first end of the plurality of cells is a positive terminal of the energy storage unit and the second end of the plurality of cells is a negative terminal of the energy storage unit.

[0010]

[0009] In a further embodiment, the first mounting provision of the holder member is an embossed region which is configured to connect with the one or more connecting members to electrically connect the plurality of cells.

[0010] In a further embodiment, the embossed region being a pre-defined depth associated with a thickness of the connecting member.

[0011]

[0011] In a further embodiment, the embossed region has a profile matching with a profile of the connecting member.

[0012]

[0012] In a further embodiment, the second mounting provision of the holder member is a protrusion which is configured to connect with one or more mating provisions of the electronic board of the energy storage unit.

[0013]

[0013] In a further embodiment, axes of the plurality of receptacles is coaxially aligned with axes of the plurality of cells, while the peripheral edge is perpendicular to the axes of the plurality of receptacles.

[0014]

[0014] In a further embodiment, the holder member comprises at least one guiding rail on an outer surface for engagement with a casing of the energy storage unit.

[0015]

[0015] In a further embodiment, the energy storage unit comprises a support structure at the first mounting provision. The support structure is configured to insulate electrical connection between the connecting member and the electronic board.

[0016]

[0016] In a further embodiment, the one or more connecting member is configured to be disposed at pre-defined areas of the energy storage unit. Each connecting member is made of a conducting material and comprises a first member. The first member comprises at least one tab configured to establish an electrical connection with a cell of the plurality of cells. The connecting member further comprises a second member. The second member comprises an extended part and at least one cut-out portion. The second member is integrated with the first member forming the connecting member. The at least one tab of the first member is positioned at the cut-out portion of the second member and the extended part of the second member is configured to connect the first member to the electronic board.

[0017]

[0017] In a further embodiment, the first member is made of a first material, the first material is nickel, and the second member is made of a second material, the second material is copper.

[0018]

[0018] In a further embodiment, the extended part of the second member is perpendicular to the cut-out portion of the second portion.

[0019]

[0019] In another aspect, the present invention is directed to a connecting member for an energy storage unit. The connecting member is configured to be disposed at pre-defined areas of the energy storage unit. Each connecting member is made of a conducting material and comprises a first member. The first member comprises at least one tab configured to establish an electrical connection with a cell of the plurality of cells. The connecting member further comprises a second member. The second member comprises an extended part and at least one cut-out portion. The second member is integrated with the first member forming the connecting member. The at least one tab of the first member is positioned at the cut-out portion of the second member and the extended part of the second member is configured to connect the first member to the electronic board.

[0020] BRIEF DESCRIPTION OF THE DRAWINGS

[0021]

[0020] 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.

[0022] Figure 1 illustrates an exploded view of an energy storage unit, in accordance with an embodiment of the present invention.

[0023] Figure 2 illustrates an assembled perspective view of the energy storage unit shown in Figure 1 , in accordance with an embodiment of the present invention.

[0024] Figure 3 illustrates another assembled perspective view of the energy storage unit shown in Figure 2, in accordance with an embodiment of the present invention.

[0025] Figure 4 illustrates an exploded view of a plurality of cells and a holder member of the energy storage unit shown in Figures 1 - 3, in accordance with an embodiment of the present invention. Figure 5 illustrates an exploded view of a plurality of cells and a holder member of the energy storage unit shown in Figure 4, in another direction, in accordance with an embodiment of the present invention.

[0026] Figure 6 illustrates a front view of the holder member shown in Figures 1 - 5, in accordance with an embodiment of the present invention.

[0027] Figure 7 illustrates a perspective view of the holder members shown in Figures 1 - 6, in accordance with an embodiment of the present invention.

[0028] Figure 8 illustrates a perspective view of an assembly of the holder members and an electronic board, in accordance with an embodiment of the present invention.

[0029] Figure 9 illustrates a front view of the assembly of the holder members and the electronic board shown in Figure 8, along with one or more connecting members, in accordance with an embodiment of the present invention.

[0030] Figure 10 illustrates a front view of the holder member, in accordance with an embodiment of the present invention.

[0031] Figure 11 illustrates a perspective view of the holder member shown in Figure 10, in accordance with an embodiment of the present invention.

[0032] Figures 12 - 16 illustrate various views of the holder members, in accordance with an embodiment of the present invention.

[0033] Figure 17 - 26 illustrate various views of the connecting members, in accordance with an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0034]

[0021] Various features and embodiments of the present invention here will be discernible from the following further description thereof, set out hereunder.

[0035]

[0022] Present invention relates to an energy storage unit of a vehicle.

[0036]

[0023] Figure 1 illustrates an exploded view of an energy storage unit 100, in accordance with an embodiment of the present invention. The energy storage unit 100 is typically used in a vehicle such as, but not limited, a two-wheeled vehicle. However, it should be understood that the energy storage unit 100 as illustrated may also find its application in other kinds of vehicle like, a three wheeled vehicle, or a four wheeled vehicle, or other multi-wheeled vehicles, or any non-automotive application which may use the energy storage unit 100. The terms “energy storage unit” and “battery pack” may be interchangeably used in the present disclosure. However, the term “battery pack” may be used more often for brevity.

[0037]

[0024] The energy storage unit 100 comprises a plurality of cells 102. In some embodiments, the plurality of cells 102 may be made of, but not limited to, Lithium-ions. It may be contemplated that the plurality of cells 102 is not limited to only Lithium-ions, and the cells may be made of any other material known in the art. Thus, the scope of application of the present invention may not be limited to only the battery pack having the Lithium-ions. The plurality of cells 102 may be rechargeable by an external electrical source (not shown) and / or by a regenerative braking system in the vehicle, and the stored energy may be utilized for supplying electrical energy to one or more electric and / or electrical components of the vehicle and / or for suppling electrical energy to a motor (not shown) for driving the vehicle. Thus, the application of the present invention may be found in vehicles, such as, but not limited to, internal combustion engine vehicles, electric vehicles, and hybrid vehicles. In some embodiments, the present invention may also find its applications apart from vehicles like any machine driven or operated by the energy of the battery pack.

[0038]

[0025] Further referring to Figure 1 , the plurality of cells 102 comprises a first end 102A and a second end 102B. The plurality of cells 102 is in cylindrical shape with a predefined length. However, it should be understood that the plurality of cells may also be any other shape apart from the cylindrical shape like prismatic. In an embodiment, the first end 102A of the plurality of cells 102 is a positive terminal of the energy storage unit 100 and the second end 102B of the plurality of cells 102 is a negative terminal of the energy storage unit 100. The terms “plurality of cells” and “cells” may be interchangeably used in this disclosure. However, both the terms “plurality of cells” and “cells” are same, and the term “cells” may be used often for sake of brevity. The cells 102 in the illustrated embodiment are arranged in a manner such that the cells 102 in one row are stacked onto the cells 102 onto another row. Further, the cells 102 in one row are arranged in such a manner that the positive terminal of a first cell, for example, is located opposite to the negative terminal of another cell adjacent to the first cell in the same row. In other words, each row of the cells comprises a plurality of cells where the first end 102A having the positive terminal of a cell is disposed opposite to the second end 102B having the negative terminal of another cell located adjacent to the cell having first end 102A with the positive terminal. As shown in Figure 1 , the energy storage unit 100 comprises a holder member 104 which is disposed at sides covering the first end 102A and the second ends 102B of the cells. In the illustrated embodiment of Figure 1 , there are two holder members 104 disposed external to the plurality of cells 102. The energy storage unit 100 further comprises one or more connecting member 112 disposed external to the holder members 104.

[0026] Referring to Figures 2 - 16, the holder member 104 is a planar body with a predetermined thickness “T” (shown in Figure 5). Each of the holder member 104 comprises a plurality of receptacles 106 (shown in Figure 6, 7, 10 and 11 ). Each of the receptacle 106 is configured to accommodate any one of the first end 102A and the second end 102B of a cell of the plurality of cells 102 as shown in Figures 2 - 5. In the illustrated embodiments of the present invention, the receptacles 106 are in a circular shape. It should be understood that the shape of receptacles can be made to any other shape. However, the shape of the receptacles 106 should be such that the receptacles should accommodate the first end 102A or the second end 102B of the cells 102, such that ends of the cells 102 are rigidly or firmly accommodated inside the receptacles 106. In some embodiments, the receptacles 106 may have a diameter which is able to receive the first end 102A and 102B of the cells 102. In some other embodiments, the holder member 104 may be made through molding process. However, the holder member 104 may also be made / manufactured through one or more process known in the art. The receptacles 106 in the holder member 104 may be made through press cutting or any other manufacturing methods. As illustrated in Figure 5, axes “A1” of the plurality of receptacles 106 are coaxially aligned with axes “ A2” of the plurality of cells 102, while the peripheral edge “E” is perpendicular to the axes “ A2” of the plurality of receptacles 106.

[0039]

[0027] The holder member 104 further comprises a pair of mounting provisions 108, 110 (shown in Figures 6 and 7) disposed on a peripheral edge “E” (shown in Figures 5 and 7) of the planar body. The pair of mounting provisions 108, 1 10 comprises a first mounting provision 108 configured to connect with one or more connecting members 112 and a second mounting provision 110 configured to connect with an electronic board 114 of the energy storage unit 100 (as shown in Figures 8 and 9). In some embodiments, the electronic board 1 14 can be a Battery Management System (BMS), which may embody one or more electrical equipment like sensors.

[0040]

[0028] In an embodiment, the first mounting provision 108 of the holder member 104 is an embossed region which is configured to connect with the one or more connecting members 112 to electrically connect the plurality of cells 102. The embossed region is a pre-defined depth associated with a thickness of the connecting member 112. In an embodiment, the embossed region has a profile matching with a profile of the connecting member 112. The second mounting provision 110 of the holder member 104 is a protrusion which is configured to connect with one or more mating provisions 114A of the electronic board 114 of the energy storage unit 100.

[0041]

[0029] In an embodiment as shown in Figure 8, the energy storage unit 100 comprises a support structure 118 at the first mounting provision 108. The support structure 118 is configured to insulate electrical connection between the connecting member 112 and the electronic board 114. In some embodiments, the support structure 118 is a cylindrical member or a grommet made of an insulator material. The support structure 118 may be provided with a through hole (not shown) for mounting onto the first mounting provision 108.

[0030] As illustrated in Figures 8 and 9, the holder member 104 comprises at least one guiding rail 116 on an outer surface 104A for engagement with a casing (not shown) of the energy storage unit 100. In the illustrated embodiment, the holder member 104 comprises two guiding rails at its extreme side edges. In some embodiments, the guiding rails 116 can be integrally formed in the holder member 104. In some other embodiments, the guiding rails 116 can be externally affixed using an adhesive.

[0042]

[0031] Referring to Figures 17 - 22 and 23 - 26, the Figures illustrate one or more connecting members 112, in accordance with an embodiment of the present invention. The one or more connecting members 112 are configured to be disposed at pre-defined areas of the energy storage unit 100. Each connecting member 112 is made of a conducting material and comprises a first member 112A. The first member 112A comprises at least one tab 112B configured to establish an electrical connection with a cell of the plurality of cells 102.

[0043]

[0032] The connecting member 112 further comprises a second member 112C. The second member 112C comprises an extended part 112D and at least one cut-out portion 112E. The second member 112C is integrated with the first member 112A forming the connecting member 112. The at least one tab 112B of the first member 112A is positioned at the cut-out portion 112E of the second member 112C and the extended part 112D of the second member 112 is configured to connect the first member 112A to the electronic board 114.

[0044]

[0033] In an embodiment, the first member 112A is made of a first material such as, but not limited to, nickel. The second member 112C is made of a second material, such as, but not limited to, copper.

[0045]

[0034] In an embodiment, the extended part 112D of the second member 112C is perpendicular to the cut-out portion 112E of the second portion 112C.

[0046]

[0035] Advantageously, the present invention addresses the limitations of the prior arts which include, but not limited to, high battery pack resistance, cell imbalance issue, short circuit, float of interconnectors and vibration of the module.

[0047]

[0036] The holder members are designed in such a way that it has grooves on top for the connecting members (interconnectors) to align and sit at assigned locations and thus eliminating floating of the interconnectors. The holder members (cell holders) have tapping points where interconnector legs will sit directly and would be bolted with the BMS for carrying signals from the cells to the BMS. The holder members have pips like structures to arrest the x and y plane vibration of the cells to eliminate the safety concerns that will arise because of vibration failures. The pips will separate the mechanical and electrical joints of the BMS.

[0048]

[0037] In the present invention, the battery pack uses cylindrical cells stacked in 4s2p configuration based on capacity requirement in conjunction with a battery management system. The bus bar / interconnector directly taps onto the BMS thereby eliminating the requirement of wires.

[0049]

[0038] The holder member comprises four round pips for sensing, which electrically connect to the BMS via screws. Additionally in case of vibrations, the screws absorb the vibration and may undergo stress. Thereby, isolating the cells and interconnectors from vibrations. Four guideways are provided at each corner of the holder member for structurally supporting the BMS. Further, four guideways or ribs are configured to interface with an internal surface of the casing to securely arrest x-direction and y-direction movement of the holder member.

[0050]

[0039] Power output terminals from the positive terminal and the negative terminal of the cells are also integrated onto the holder member. Overall the electrical connections between the cells and the BMS via the cell holder comprise two power sensing terminals, three voltage sensing terminals.

[0051]

[0040] Since the connecting members (busbars) are laser welded onto the cell’s tapping surfaces, it eliminates issues of increased internal resistance via soldering. Once the connecting members are securely disposed in the respective slots, the voltage and power sensing terminals between the BMS and cells are connected via screws. Once the entire assembly of the cells with the holder member, the connecting members and the BMS is completed, the assembly is disposed in the casing.

[0052]

[0041] While the connecting member is a metal such as brass, the locking screws for connecting the connecting member to the BMS are made of plastic to ensure improved reliability and mechanical strength and prevent any form of undesired electrical conduction (which may occur in metal screws).

[0053]

[0042] The holder member is made of poly carbonate material which is thermally as well as electrically insulative.

[0054]

[0043] Earlier connections between the cells / electrode surfaces and the interconnector / busbar were done via spot welding, thereby the tapping surface was provided with dimples / illustrating slots where spot welding was done, with a slit between the dimples for bearing the current capacity. However, in the present invention since laser welding is used, the tapping surface of the connecting member is modified to ensure maximum area of contact during laser welding existing between the electrode surface of the cell and the connecting member (interconnector).

[0055]

[0044] The technical problem pertinent to interconnector design is linked with the issues of floating interconnector lacking any design or profile addressing z- direction movement of the interconnector. The technical solution to the solve the issues of floating interconnectors and appropriate strength of connection between interconnector and the electrode of the cell includes laser welding assisted by way of present interconnector design. Further, the profile of the interconnector is manufactured such that it exactly sits in the embossed region of the holder member. Since laser welding (which provides higher current carrying) is being employed, it is essential to provide a material assisting in laser welding (i.e. , nickel) and a second material (i.e., copper) which ensures signal (i.e., current, voltage and power) transmissions from the cells to the BMS.

[0056]

[0045] The connecting members are designed and profiled in such a way that designated slots are only allotted to sit on the cell terminals for laser welding for better cross section of welding as it must carry high currents. The interconnectors are designed in such a way that it will go sit on designated areas on the cell holder / holder member to avoid float of the interconnector during welding. The interconnector designed are sandwich interconnectors of copper and nickel laser welded together where copper provides current carrying and cell imbalance advantage and nickel aids in laser welding.

[0046] Further, the current capacity of the interconnector isn’t sustainable by only using nickel and thus, the provision of copper is provided.

[0057]

[0047] Further, as there was no provision to arrest the float of the interconnector in the existing design and if the float is not arrested, it would lead to vibrational electrical and mechanical failure during welding and in later stages leading to major safety issues to the customer and in manufacturability. However, the present invention solves said technical problems.

[0058]

[0048] Strips of nickel were spot welded on the cells directly with no design profile. If the interconnectors are not designed or profiled properly, it will touch other mechanical or electrical parts leading to short and safety hazards.

[0059]

[0049] The first member of the connecting member is made of nickel may have a thickness of 0.2 mm and the second member of the connecting member made of copper may have a thickness of 1.8 mm. Thus, the overall thickness of the connecting member (interconnector) would be about 2 mm.

[0060]

[0050] The disclosed configuration of the cells is better applicable for higher cc bikes such as over 310 cc. This is because, since the energy density of Li-ion is better.

[0061]

[0051] As the BMS directly taps onto the connecting member connecting the cells, Poka yoke configuration of slots embossed in the cell holder for secure disposition of the busbars is ensured. The cell tapping surfaces are properly intact and additionally the issues associated with floating interconnectors are addressed. Since the embossed slots receiving the interconnectors occupy the exact thickness of the interconnector and thus the issues pertinent to packaging do not crops up. Additionally, the cell holder with the cell and interconnector assembly can be easily disposed in the casing and thus the packaging efficiency of the entire battery pack is improved by provision of embossed surfaces for receiving the interconnectors. Thereby, the gap between the interconnector and a housing or enclosure is approximately 0.4mm > which ensures that enough clearance for disposition is present at the same time reduces the overall size of battery pack which would have otherwise been present if the interconnectors were floating.

[0062]

[0052] The present invention improves overall vehicle performance owing to reduced number of failed cranks (during combustion initiation process) as well as reduced attenuation of power transmission via the interconnectors from the cells to the BMS. Further, reduced weight of the battery pack further improves vehicle agility since wires and soldering are completely eliminated. Better durability of Li-Ion against lead acid. Further the pips and mounting structures securely hold the cells as well as the BMS and interconnector in position. Ease of assembly is achieved in the present configuration incorporates Poka yoke aspect in reducing assembly time and ease of manufacturability of the overall battery pack. Improved handling since the Poka yoke implementation with reducing in floating interconnectors eases overall handling of the battery pack. Chances of short circuiting between the cells and the bus bar / connecting members are eliminated since the four supporting pips disposing the BMS on the cell holder / holder member provide an adequate insulation between the BMS and cells. Further, even between the cells the cell holder maintains cell spacing to prevent any form of charge transmission. The elimination of wires further enhances the object of addressing short circuiting, since accidental floating of live wires between cells and BMS is eliminated. The present configuration via the method of assembly employs laser welding thereby reducing internal resistance of the module which occurs in soldering processes. Signal (i.e. , voltage and power sensing) transmission losses between the BMS and the cells are eliminated since the cell holder directly connects the BMS to the cells via busbar or interconnector. In earlier configuration, the signals (i.e., voltage and power sensing) were transmitted by the bus bars connected to wires which would then connect onto the BMS.

[0063]

[0053] 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 modification may be made without departing from the scope of the invention as defined in the following claims.

[0064] List of Reference Numerals and Characters:

[0065] 100: Energy storage unit

[0066] 102: Cells

[0067] 102A: First end

[0068] 102B: Second end 104A: Outer surface

[0069] 106: Plurality of receptacles

[0070] 108: First mounting provisions

[0071] 1 10: Second mounting provisions

[0072] 112: Connecting members

[0073] 1 12A: First member

[0074] 1 12B: Tab

[0075] 1 12C: Second member

[0076] 1 12D: Extended part

[0077] 112E: Cut-out portion

[0078] 1 14: Electronic board

[0079] 1 14A: Mating provisions

[0080] 1 16: Guiding rail

[0081] 1 18: Support structure

[0082] T: Thickness

[0083] E: Peripheral edge

[0084] A1 : Axes of receptacles

[0085] A2: Axes of cells

Claims

WE CLAIM:1 . An energy storage unit (100), the energy storage unit (100) comprising: a plurality of cells (102), the plurality of cells (102) comprises a first end (102A) and a second end (102B); and at least one holder member (104), the at least one holder member (104) being a planar body with a predetermined thickness (T), each holder member (104) comprising: a plurality of receptacles (106), each of the receptacle (106) being configured to accommodate any one of the first end (102A) and the second end (102B) of a cell of the plurality of cells (102); and a pair of mounting provisions (108, 110) disposed on a peripheral edge (E) of the planar body, the pair of mounting provisions (108, 110) comprising a first mounting provision (108) being configured to connect with one or more connecting members (112) and a second mounting provision (110) being configured to connect with an electronic board (1 14) of the energy storage unit (100).

2. The energy storage unit (100) as claimed in claim 1 , wherein the first end (102A) of the plurality of cells (102) being a positive terminal of the energy storage unit (100) and the second end (102B) of the plurality of cells (102) being a negative terminal of the energy storage unit (100).

3. The energy storage unit (100) as claimed in claim 1 , wherein the first mounting provision (108) of the holder member (104) is an embossed region which is configured to connect with the one or more connecting members (112) to electrically connect the plurality of cells (102).

4. The energy storage unit (100) as claimed in claim 3, wherein the embossed region being a pre-defined depth associated with a thickness of the connecting member (112).

5. The energy storage unit (100) as claimed in claim 3, wherein the embossed region has a profile matching with a profile of the connecting member (112).

6. The energy storage unit (100) as claimed in claim 1 , wherein the second mounting provision (1 10) of the holder member (104) is a protrusion which is configured to connect with one or more mating provisions (114A) of the electronic board (114) of the energy storage unit (100).

7. The energy storage unit (100) as claimed in claim 1 , wherein axes (A1 ) of the plurality of receptacles (106) being coaxially aligned with axes (A2) of the plurality of cells (102), while the peripheral edge (E) being perpendicular to the axes (A2) of the plurality of receptacles (106).

8. The energy storage unit (100) as claimed in claim 1 , wherein the holder member (104) comprises at least one guiding rail (116) on an outer surface (104A) for engagement with a casing of the energy storage unit (100).

9. The energy storage unit (100) as claimed in claim 1 comprising a support structure (118) at the first mounting provision (108), the support structure (118) being configured to insulate electrical connection between the connecting member (112) and the electronic board (1 14).

10. The energy storage unit (100) as claimed in claim 1 , wherein the one or more connecting member (112) being configured to be disposed at predefined areas of the energy storage unit (100), each connecting member (112) being made of a conducting material and comprises: a first member (112A), the first member (112A) comprising at least one tab (112B) configured to establish an electrical connection with a cell of the plurality of cells (102); and a second member (112C), the second member (112C) comprising an extended part (112D) and at least one cut-out portion (112E), the second member (112C) being integrated with the first member (112A) forming the connecting member (112), wherein the at least one tab (112B) of the first member (112A) being positioned at the cut-out portion (112E) of the second member (112C) and the extended part (112D) of the secondmember (112C) being configured to connect the first member (112A) to the electronic board (114).1 1. The energy storage unit (100) as claimed in claim 10, wherein the first member (112A) is made of a first material, the first material being nickel and the second member (112C) is made of a second material, the second material being copper.

12. The energy storage unit (100) as claimed in claim 10, wherein the extended part (112D) of the second member (112C) is perpendicular to the cut-out portion (112E) of the second portion (112C).

13. A connecting member (112) for an energy storage unit (100), the connecting member (112) being configured to be disposed at pre-defined areas of the energy storage unit (100), each connecting member (112) being made of a conducting material and comprises: a first member (112A), the first member (112A) comprising at least one tab (112B) configured to establish an electrical connection with a cell of the plurality of cells (102); and a second member (112C), the second member (112C) comprising an extended part (112D) and at least one cut-out portion (112E), the second member (112C) being integrated with the first member (112A) forming theconnecting member (112), wherein the at least one tab (112B) of the first member (112A) being positioned at the cut-out portion (112E) of the second member (112C) and the extended part (112D) of the second member (112C) being configured to connect the first member (112A) to the electronic board (114).

14. The connecting member (112) as claimed in claim 13, wherein the first member (112A) is made of a first material, the first material being nickel and the second member (112C) is made of a second material, the second material being copper.

15. The connecting member (112) as claimed in claim 13, wherein the extended part (112D) of the second member (112C) is perpendicular to the cut-out portion (112E) of the second portion (112C).

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