Description:FIELD OF THE INVENTION
[001] The present invention relates to a cell holder. More specifically, the present invention relates to a cell holder for efficiently connecting a plurality of cells in an energy storage device.

BACKGROUND OF THE INVENTION
[002] Conventionally, an energy storage device consists of multiple cells such as Lithium-ion or Nickel metal hydride cells. The cells are typically grouped together into modules which are then interconnected within a battery pack to achieve the desired output power. Conventionally, the cells are configured such that the positive terminal and the negative terminal of the battery are provided on opposing faces of the cell. To provide the multiple cells in a pack formation, a pair of holders are utilised wherein one holder holds the cells at the one face while the other holder holds the cells at the other face. Therefore, to connect the multiple cells to a terminal connector, welding of the cell to the connector is required on both the holders or the opposing faces of the cells. Such connection is called a dual side welding, since welding is required on two sides of the battery pack.
[003] Such dual welding for manufacturing of the battery pack requires complex and specialised welding machines, resulting in a high manufacturing cost and a substantial increase in manufacturing time. Integration of the manufacturing of the battery pack into a computer integrated manufacturing (CIM) becomes extremely sophisticated. Further, presence of a higher number of welding joints at different locations also leads to higher resistance, resulting in higher resistance losses.
[004] The higher resistance loss also leads to higher generation of heat. The conventional arrangements using dual side welding are thus affected by poor thermal management and lowered heat dissipation. Provision of welding joints on opposing faces of the cells has a further detrimental effect on the thermal management and heat dissipation capabilities of the battery pack.
[005] Thus, there is a need in the art for a cell holder, which addresses at least the aforementioned problems.

SUMMARY OF THE INVENTION
[006] In one aspect, the present invention provides a cell holder for accommodating a plurality of cells. The cell holder has one or more housings configured to receive a cell. Each cell has a positive terminal and a negative terminal provided at a first end of the cell. Each housing has an opening configured to allow at least a portion of the positive terminal of the cell and at least a portion of the negative terminal of the cell to be exposed.
[007] In an embodiment, a periphery of the opening is shaped to expose at least the portion of the negative terminal of the cell.
[008] In a further embodiment of the present invention, a portion of the periphery of the opening is semi-circular in shape or C-shaped thereby allowing the negative terminal of the cell to be exposed.
[009] In another embodiment, an interconnector is provided to connect the cells. In this regard, the opening is configured to receive the interconnector. The interconnector has a first terminal configured to be connected to the positive terminal of the cell, and a second terminal configured to be connected to the negative terminal of the cell.
[010] In an embodiment, the first terminal of the interconnector is of arch shaped or D-shaped.
[011] In a further embodiment, the second terminal is of semi-circular shaped or C-shaped and configured to be received in the semi-circular shape or C-shaped portion of the periphery of the opening.
[012] In an embodiment, the positive terminal of the cell is welded to the first terminal of the interconnector by at least one of a spot weld and a laser weld and a wire bond.
[013] In a further embodiment, the negative terminal of the cell is welded to the second terminal of the interconnector by at least one of a spot weld, a laser weld and a wire bond.
[014] In a further embodiment, the cell holder has one or more spacer provided adjacent to the periphery of the opening to avoid short circuiting.
[015] In another embodiment, the cell holder is made of polyvinyl chloride (PVC) or polycarbonate/acrylonitrile-butadiene-styrene (PCABS).
[016] In another aspect, the present invention relates to an energy storage device having a cell holder. The cell holder has one or more housings configured to receive a cell. Each cell has a positive terminal and a negative terminal provided at a first end of the cell. Each housing has an opening configured to allow at least the portion of the positive terminal of the cell and at least a portion of the negative terminal of the cell to be exposed.
[017] In an embodiment, a periphery of the opening is shaped to expose at least the portion of the negative terminal of the cell.
[018] In a further embodiment of the present invention, a portion of the periphery of the opening is semi-circular in shape or C-shaped thereby allowing the negative terminal of the cell to be exposed.
[019] In another embodiment, an interconnector is provided to connect the cells. In this regard, the opening is configured to receive the interconnector. The interconnector has a first terminal configured to be connected to the positive terminal of the cell, and a second terminal configured to be connected to the negative terminal of the cell.
[020] In an embodiment, the first terminal of the interconnector is of arch shaped or D-shaped.
[021] In a further embodiment, the second terminal is of semi-circular shaped or C-shaped and configured to be received in the semi-circular shape or C-shaped portion of the periphery of the opening.
[022] In an embodiment, the positive terminal of the cell is welded to the first terminal of the interconnector by at least one of a spot weld and a laser weld and a wire bond.
[023] In a further embodiment, the negative terminal of the cell is welded to the second terminal of the interconnector by at least one of a spot weld and a laser weld and a wire bond.
[024] In a further embodiment, the cell holder has one or more spacer provided adjacent to the periphery of the opening.
[025] In another embodiment, the cell holder and the casing are made of polyvinyl chloride (PVC) or polycarbonate / acrylonitrile-butadiene-styrene (PCABS).

BRIEF DESCRIPTION OF THE DRAWINGS
[026] Reference will be made to embodiments of the invention, examples of which may be illustrated in accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
Figure 1 illustrates an exemplary embodiment showing a cell holder and a plurality of cells, in accordance with the present invention.
Figure 2 illustrates an exemplary embodiment of a positive terminal and negative terminal of an interconnector, in accordance with the present invention.
Figure 3 illustrates an exemplary embodiment showing a cell holder having a plurality of housings, in accordance with the present invention.
Figure 4 illustrates an exemplary embodiment showing the cells being housed in the cell holder, in accordance with the present invention.
Figure 5 illustrates an exemplary embodiment showing a bottom view of the cells when housed inside the cell holder, in accordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION
[027] The present invention relates to a cell holder and an energy storage device having the cell holder. The cell holder is configured to receive and accommodate a plurality of cells.
[028] Figure 1 shows a cell holder and is configured to house a plurality of cells, in accordance with the present invention. As shown in the figure, the cell holder 101 has a plurality of housings 105 and each of the housings 105 in the cell holder 101 is configured to receive a single cell 120. It may be noted that while the cell 120 has been illustrated as cylindrical in shape, the present invention contemplates that the cell 120 can be of any shape and size. For example, the cell 120 may be rectangular shaped, in which case the housing 105 is designed to accommodate rectangular shaped cells. It should be obvious to a person of ordinary skill in the art that various shapes and sizes of the housing may be designed based on the shape and size of the cell used to build the energy storage device 100.
[029] Each of the cells 120 extends between a first end 122 and a second end 124. The cell 120 may be designed to have a pre-defined length or a standard length. Each of the cell 120 has a positive terminal 125 and a negative terminal 127, which are provided at the first end 122 of the cell 120. The positive terminal 125 is provided at the centre of on the first end 122 of the cell 120, whereas the negative terminal 127 is provided around the periphery or circumference of the first end 122 of the cell 120. The cell 120 in accordance with the present invention is designed such that both the positive terminal 122 of the cell 120 and the negative terminal 127 of the cell 120 are configured to be exposed at the first end 122. This ensures that all the cells 120 in the cell holder 101 are oriented in the same direction, and hence all the interconnectors need to be welded only on one side.
[030] Additionally, any modifications made to the cell holder 101 only need to be done on a single side. The other side of the cell holder 101 need not be changed or modified at all. This ensures that minimal modifications are being made to the cell holder and hence the energy storage device in order to achieve several technical advantages like single side welding, orientation of the cell being uniform along a same direction and orienting the cells in parallel making the cells work more efficiently etc.
[031] Each of the cell 120 are configured to be placed in a plurality of housing 105 of the cell holder 101. The plurality of housing 105 may be arranged in an array in a pre-defined manner, forming a pre-defined shape. For example, as illustrated the plurality of cells are arranged in a rectangular manner forming a matrix. Other shapes for the cell holder 105 may be possible, for example a hexagonal shape, a rectangular shape etc., and all such shapes for the cell holder 105 fall within the scope of the present invention.
[032] Each of the plurality of housing 105 of the cell holder 101 has an opening 110, where the opening 110 is configured to allow at least a portion of the positive terminal 125 of the cell 120 and at least a portion of the negative terminal 127 of the cell 120 to be exposed. The periphery 115 (which may also be referred to as circumference or part of the circumference) of the opening 110 is shaped so as to expose at least the portion of the negative terminal 127 of the cell 120. At least a portion of the periphery 115 of the opening 110 is semi-circular in shape or C-shaped. The semi-circular shape at the opening 110 allows the negative terminal 127 of the cell 120 to be exposed, while at least a portion of the positive terminal 125 of the cell 120 is exposed at the opening 110.
[033] The opening 110 is designed such that it is configured to receive an interconnector 200. The interconnector essentially makes the connection between the cells 120 housed in each of the plurality of housing 105, thereby ensuring all the cell 120 in the cell holder 101 are connected, which form an energy storage device 100 and power may be drawn from the energy storage device 100.
[034] The positive terminal 125 of the cell 120 is welded to a positive terminal of the interconnector 200, and the negative terminal 127 of the cell 120 is welded to a negative terminal of the interconnector 200 by at least one of a spot weld and a laser weld and a wire bond. It should be obvious to a person of ordinary skill in the art that various other techniques may be used to bond the terminals of the cell to the terminals of the interconnector and all such techniques fall within the scope of the present invention.
[035] Each of the plurality of housing 105 of the cell holder 101 is provided with one or more spacers 150. The one or more spacer 150 separates each of the plurality of housing 105, and in a preferred embodiment, the spacer 150 is placed proximate to the periphery 115, which is configured to accommodate the negative terminal 127 of the cell 120. The one or more spacer 150 between the plurality of housing 105 ensures that when the cell 120 are connected to the interconnector 200, any chance of a short circuit occurring accidently because of consecutive positive terminals of the cell or negative terminals of the cell coming into contact is prevented. The cell holder 101 is preferably made from PVC or PCABS. It should be obvious to a person of ordinary skill in the art that other similar materials may be used to make the cell holder 101 and all such materials fall within the scope of the present invention.
[036] A mould may be first prepared in the desired shape of the cell holder 101 and PVC or PCABS may be used to form the cell holder 101 of the desired shape. It should be obvious to a person of ordinary skill in the art that various other material may also be used to form the cell holder. As disclosed herein, the cell holder 101 is made in the present invention considering cylindrical cell 120, specifically Li-Ions or Li-polymer cells, and if the shape or size of the cells 120 are different, the shape of the mould may be changed to make the cell holder 101 of a desired shape to accommodate the cell. For example, if the shape of the cell is rectangular, then the cell holder 101 may be designed to be rectangular in shape, and the positive terminal of the cell, the negative terminal of the cell and the interconnector may be designed to be accommodated for the cell holder 101.
[037] Figure 2 illustrates an exemplary embodiment of a positive terminal and negative terminal of an interconnector, in accordance with the present invention. As illustrated only a part of the interconnector 200 consisting of the positive terminal, the negative terminal and the bus is shown in the Figure. Each interconnector 300 has many such positive terminals and negative terminals connected at predefined locations on a bus and the interconnector 200 in general is designed to connect all cells in a row or column the cell holder 101 that are housed within the plurality of housing 105. All the positive terminal 205 of the interconnector 200 are connected with all the positive terminal 125 of the cell 120, which is then connected to a main positive terminal of the energy storage device 100. Similarly, all the negative terminal 210 interconnector 200 is connected with all the negative terminal 127 of the cell 120, and then connected to a main negative terminal of the energy storage device 100. Energy may be drawn from the main positive terminal and main negative terminal of the energy storage device 100, which in turn would draw the required power for the vehicle from the cell 120 connected in the cell holder 101.
[038] As illustrated at least a part of the interconnector 200 has a first terminal 205 configured to be connected to the positive terminal 125 of the cell 120, and a second terminal 210 configured to be connected to the negative terminal 127 of the cell 120. The first terminal 205 of the interconnector 200 is of arch shaped or D-shaped and is connected to the positive terminal 125 at the opening 110. The second terminal 210 of the interconnector 200 is of semi-circular shaped or C-shaped and is configured to be received in the semi-circular shape or C-shaped portion of the periphery 115 of the opening 110, where the negative terminal 127 of the cell 120 is exposed. The positive terminal 125 of the cell 120 is welded to the first terminal 205 of the interconnector 200 by at least one of a spot weld and a laser weld and a wire bond. The negative terminal 127 of the cell 120 is welded to the second terminal 210 of the interconnector 200 by at least one of a spot weld and a laser weld and a wire bond. It should also be obvious to a person of ordinary skill in the art that various other techniques may be used for welding or bonding the terminals of the cell with the terminals of the interconnector and all such techniques fall within the scope of the present invention.
[039] The interconnector 200 may be formed a conducting material or an alloy or a layered composite. The alloy may be a combination of Copper and Nickel in a predetermined ratio. The layered composite be an admixture of a first material coated with a second material, and wherein the first material and the second material are either one of Nickel or Copper. Further, the conducting material may be at least one of Aluminium, Copper or Nickel.
[040] Figure 3 illustrates an exemplary embodiment showing a cell holder having a plurality of housings, in accordance with the present invention. The cell holder 101 is made up of a plurality of housing 105 arranged in a per-defined shape. The shape of the cell holder 101 illustrate herein is rectangular shaped, but essentially it should be obvious to a person of ordinary skill in the art that the shape of the cell holder can be designed to vary, for example a square shape, a hexagonal shape etc., as desired by the space available for the energy storage device to be fixed in the vehicle.
[041] Each of the plurality of housing 105 has an opening 110, where a first end 122 of the cell 120 is exposed, the first end of the cell 120 having a positive terminal 125 and a negative terminal 127 on the periphery or circumference. The opening 110 has a periphery 115 which is configured to accommodate the negative terminal 127 of the cell 120 and is designed such that the negative terminal 210 of the interconnector 200 can be accommodate, such that a connection can be made between the negative terminal 127 of the cell 120 and the negative terminal 210 of the interconnector 200. Proximate to the periphery 115 of each of the plurality of housing 105, one or more spacer 150 is provided such that there is a definitive space between two consecutive housing units of the plurality of housings 105, thereby preventing any chance of a short circuit from occurring due to the connections in the cell holder 101.
[042] The one or more spacer 150 essentially acts as a divider when a number of cells are connected in an array, and prevents the negative terminals of the cells and the negative terminals of the interconnector or the positive terminals of the cells and the positive terminals of the interconnector from accidentally coming into direct contact, thereby preventing an short circuit otr explosion. In an exemplary case, a conducting material may accidently fall or be placed between two cells connected in an array, which may result in a short circuit and explosion of cells, and the cell holder 101 so designed prevents such accidental short circuits from occurring and prevent any undue explosion of the cells 120..
[043] Figure 4 illustrates an exemplary embodiment showing the cells being housed in the cell holder, in accordance with the present invention. The cell holder 101, the plurality of housing 105 and the interconnector 200 have been described previously with respect to Figures 1 to 3. Figure 4 illustrates an energy storage device 400 which has a cell holder 101, and the shape and size of the energy storage device 400 may vary and depend on various parameters such as the shape of the cell, the size of the cell, etc. In an example, the shape of the energy storage device may be rectangular as illustrated in the figure. In another example the shape may be hexagonal and may be designed such based on the availability of space for placing the energy storage device in the vehicle. It should therefore be obvious to a person of ordinary skill in the art that the shape and size of the energy storge device 400 may vary and all shapes and sizes of such energy storage device fall within the scope of the present invention.
[044] The cell holder 101 in the energy storage device 400 has a plurality of housings 105 and each of the housings 105 in the cell holder 101 is configured to receive a single cell 120. As disclosed previously, it should be obvious to a person of ordinary skill in the art that various shapes and sizes of the housing 105 may be designed based on the shape and size of the cell used to build the energy storage device.
[045] Each of the cells 120 extends between a first end 122 and a second end 124. The cell 120 may be designed to have a pre-defined length or a standard length. Each of the cell 120 has a positive terminal 125 and a negative terminal 127, which are provided at the first end 122 of the cell 120. The positive terminal 125 is provided at the centre of on the first end 122 of the cell 120, whereas the negative terminal 127 is provided around the periphery 115 or circumference of the first end 122 of the cell 120. The cell 120 in accordance with the present invention is designed such that both the positive terminal 125 of the cell 120 and the negative terminal 127 of the cell 120 are configured to be exposed at the first end 122.
[046] Each of the cell 120 are configured to be placed in a plurality of housing 105 of the cell holder 101 that make the energy storage device 400. Each of the plurality of housing 105 of the cell holder 101 has an opening 110, where the opening 110 is configured to allow at least a portion of the positive terminal 125 of the cell 120 and at least a portion of the negative terminal 127 of the cell 120 to be exposed. The periphery 115 (which may also be referred to as circumference or part of the circumference) of the opening 110 is shaped so as to expose at least the portion of the negative terminal 125 of the cell 120. At least a portion of the periphery 115 of the opening 110 is semi-circular in shape or C-shaped. The semi-circular shape at the opening 110 allows the negative terminal 127 of the cell 120 to be exposed, while at least a portion of the positive terminal 125 of the cell 120 is exposed at the opening 110.
[047] The opening 110 is designed such that it is configured to receive an interconnector 200. The interconnector essentially makes the connection between the cells 120 housed in each of the plurality of housing 105, thereby ensuring all the cell 120 in the cell holder 101 are connected, which form an energy storage device and power may be drawn from the energy storage device.
[048] The positive terminal 125 of the cell 120 is welded to a positive terminal 205 of the interconnector 200, and the negative terminal 127 of the cell 120 is welded to a negative terminal 210 of the interconnector 200 by at least one of a spot weld and a laser weld and a wire bond. It should be obvious to a person of ordinary skill in the art that various other techniques may be used to weld or bond the terminals of the cell 120 to the terminals of the interconnector 200 and all such techniques fall within the scope of the present invention.
[049] Each of the plurality of housing 105 of the cell holder 101 is provided with one or more spacer 150. The one or more spacer 150 separates each of the plurality of housing 105, and in a preferred embodiment, the spacer 150 is placed proximate to the periphery 115, which is configured to accommodate the negative terminal 127 of the cell 120. The one or more spacer 150 between the plurality of housing 105 ensures that when the cell 120 are connected to the interconnector 200, any chance of a short circuit occurring accidently because of consecutive positive terminals of the cell or negative terminals of the cell coming into contact is prevented. The cell holder 101 is preferably made from PVC or PCABS. Other similar materials may be used to make the cell holder 101 and all such materials fall within the scope of the present invention.
[050] Each interconnector 200 has many such positive terminal 205 and negative terminals 210, and the interconnector 200 in general is designed to connect all cells 120 in a row or column the cell holder 101 that are housed within the plurality of housing 105. Each of the positive terminals 205 of the interconnectors 200 is connected with the positive terminal 125 of the cell 120, and then connected to a main positive terminal of the energy storage device 400. Similarly, each of the negative terminals 210 of the interconnectors 200 is connected with the negative terminal 127 of the cell 120, and then connected to a main negative terminal of the energy storage device 400. Energy may be drawn from the main positive terminal and main negative terminal, which in turn would provide power for the vehicle from the cell 120 connected in the cell holder 101.
[051] As illustrated at least a part of the interconnector 200 has a first terminal 205 configured to be connected to the positive terminal 125 of the cell 120, and a second terminal 210 configured to be connected to the negative terminal 127 of the cell 120. The first terminal 205 of the interconnector 200 is of arch shaped or D-shaped and is connected to the positive terminal 125 at the opening 110. The second terminal 210 of the interconnector 200 is of semi-circular shaped or C-shaped and is configured to be received in the semi-circular shape or C-shaped portion of the periphery 115 of the opening 110, where the negative terminal 127 of the cell 120 is exposed. The positive terminal 125 of the cell 120 is welded to the first terminal 205 of the interconnector 200 by at least one of a spot weld and a laser weld and a wire bond. The negative terminal 127 of the cell 120 is welded to the second terminal 210 of the interconnector 200 by at least one of a spot weld and a laser weld and a wire bond. It should also be obvious to a person of ordinary skill in the art that various other techniques may be used for welding or bonding the terminals of the cell with the terminals of the interconnector and all such techniques fall within the scope of the present invention.
[052] A mould may be first prepared in the desired shape of the cell holder 101 and PVC or PCABS may be used to form the cell holder 101 of the desired shape. It should be obvious to a person of ordinary skill in the art that various other material may also be used to form the cell holder. As disclosed herein, the cell holder 101 is made in the present invention considering cylindrical cell, specifically Li-Ions or Li-polymer cells, and if the shape or size of the cells are different, the shape of the mould may be changed to make the cell holder 101 of a desired shape to accommodate the cell. For example, if the shape of the cell is rectangular, then the cell holder 101 may be designed to be rectangular in shape, and the positive terminal and the negative terminal of the cell and the interconnector may be designed to be accommodated for the cell holder 101.
[053] Figure 5 illustrates an exemplary embodiment showing a bottom view of the cells when housed inside the cell holder, in accordance with the present invention. The bottom view of the energy storage device 400 illustrates the cell holder 101 configured to hold a plurality of cells 120. All other descriptions of the energy storage device 500, the cell holder 101 and the cell 120 have been disclosed previously.
[054] Advantageously, the current design of the cell holder 101 allows for each of the plurality of cells in the energy storage device to be arranged in parallel configuration and all the cells are in the same orientation, thereby maximizing power efficiency drawn from the energy storage device. Advantageously the cell holder may be made from PVC or PCABS or other suitable materials. Further, the design of the cell holder ensure that all the cells are oriented in the same direction, therefore all the interconnectors only need to be welded on one side of the energy storage device using such a cell holder, thereby providing better efficiency in terms of power usage and also preventing any inadvertent short circuit from occurring. Additionally, the any further modifications to the cell holder need to be done on one side, thereby saving cost and material, as the other side of the cell holder need not be changed or modified, allowing for minimum modifications being made to achieve the technical advantages.
[055] In an advantageous embodiment, the interconnectors are designed in such a way that the interconnect structures have negative terminal connectors and positive terminal connectors distinguished in two different shapes for ease of assembly by the operators in the operation line thereby eliminating the chance of any error that may result in a short circuit of the energy storage device, and the current design may be applied to energy storage devices in general.
[056] 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.

List of Reference Numerals
101: Cell Holder
105: Housing
110: Opening
115: Periphery
150: Spacer
120: Cell
122: First End of the Cell
125: Positive Terminal
127: Negative Terminal
124: Second End of the Cell
200: Interconnector
205: First Terminal
210: Second Terminal
400: Energy Storage Device , Claims:WE CLAIM:
1. A cell holder (101), the cell holder (101) comprising:
one or more housings (105), each housing (105) configured to receive a cell (120), the cell (120) having a positive terminal (125) and a negative terminal (127) provided at a first end (122) of the cell, each housing (105) comprises: an opening (110) configured to allow at least a portion of the positive terminal (125) of the cell (120) and at least a portion of the negative terminal (127) of the cell (120) to be exposed.

2. The cell holder (101) as claimed in claim 1, wherein a periphery (115) of the opening (110) being shaped to expose at least the portion of the negative terminal (127) of the cell (120).

3. The cell holder (101) as claimed in claim 2, wherein a portion of the periphery (115) of the opening (110) being semi-circular shape or C-shaped thereby allowing the negative terminal (127) of the cell (120) to be exposed.

4. The cell holder (100) as claimed in claim 1, wherein the opening (110) being configured to receive an interconnector (200), the interconnector (200) comprising: a first terminal (205) configured to be connected to the positive terminal (125) of the cell (120); and a second terminal (210) configured to be connected to the negative terminal (127) of the cell (120).
5. The cell holder (101) as claimed in claim 4, wherein the first terminal (205) being of arch shaped or D-shaped, and wherein the second terminal (210) being of semi-circular shaped or C-shaped and configured to be received in the semi-circular shape or C-shaped portion of the periphery (115) of the opening (110).

6. The cell holder (101) as claimed in claim 4, wherein the positive terminal (125) of the cell (120) being welded to the first terminal (205) of the interconnector (200) by at least one of a spot weld, a laser weld and a wire bond, and wherein the negative terminal (127) of the cell (120) being welded to the second terminal (210) of the interconnector (200) by at least one of a spot weld, a laser weld and a wire bond.

7. The cell holder (101) as claimed in claim 2, comprising one or more spacers (150) provided adjacent to the periphery (115) of the opening (110) to avoid short circuiting.

8. The cell holder (101) as claimed in claim 1, wherein the cell holder (101) comprises polyvinyl chloride (PVC) or polycarbonate/ acrylonitrile-butadiene-styrene (PCABS).

9. An energy storage device (400) comprising:
a cell holder (101), the cell holder (101) comprising:
one or more housings (105), each housing (105) configured to receive a cell (120), the cell (120) having a positive terminal (125) and a negative terminal (127) provided at a first end (122) of the cell, each housing (105) comprises: an opening (110) configured to allow at least a portion of the positive terminal (125) of the cell (120) and at least a portion of the negative terminal (127) of the cell (120) to be exposed.

10. The energy storage device (400) as claimed in claim 9, wherein a periphery (115) of the opening (110) being shaped to expose at least a portion of the negative terminal (127) of the cell (120).

11. The energy storage device (400) as claimed in claim 10, wherein a portion of the periphery (115) of the opening (110) being semi-circular shape or C-shaped thereby allowing the negative terminal (127) of the cell (120) to be exposed.

12. The energy storage device (400) as claimed in claim 9, wherein the opening (110) being configured to receive an interconnector (200), the interconnector (200) comprising: a first terminal (205) configured to be connected to the positive terminal (125) of the cell (120) and a second terminal (210) configured to be connected to the negative terminal (127) of the cell (120).

13. The energy storage device (400) as claimed in claim 12, wherein the first terminal (205) being of arch shaped or D-shaped, and wherein the second terminal (210) being of semi-circular shaped or C-shaped and configured to be received in the semi-circular shape or C-shaped portion of the periphery (115) of the opening (110).

14. The energy storage device (400) as claimed in claim 12, wherein the positive terminal (125) of the cell (120) being welded to the first terminal (205) of the interconnector (200) by at least one of a spot weld and a laser weld and a wire bond, and wherein the negative terminal (127) of the cell (120) being welded to the second terminal (210) of the interconnector (200) by at least one of a spot weld and a laser weld and a wire bond.

15. The energy storage device (400) as claimed in claim 9, wherein each housing (105) comprising one or more spacers (150) provided adjacent to the periphery (115) of the opening (110) to avoid short circuiting.

16. The energy storage device (400) as claimed in claim 9, wherein the cell holder (100) and the casing comprise polyvinyl chloride (PVC) or polycarbonate/acrylonitrile-butadiene-styrene (PCABS).