Description:TECHNICAL FIELD
[0001] The present subject matter relates generally to a battery pack structure and more particularly but not exclusively to a fireproof battery pack structure. The present application is a patent of addition with respect to the patent application number 202041028936.
BACKGROUND
[0001] Rechargeable Batteries for example lithium-ion batteries and lead acid batteries are commonly used in portable electronics and in many automobile applications. Due to better power efficiency and life expectancy, lithium-ion batteries are preferred for said portable electronics and in many automobile applications. In automobile industry, the lithium-ion batteries are used for fulfilling power requirements for electrical components and for assisting in engine cranking operation. In addition, lithium-ion batteries are widely used in automobile sector to provide traction power to an electric or hybrid electric vehicles.
[0002] The lithium-ion battery includes several lithium-ion cells. Each lithium-ion cell includes an anode, a cathode and a separator submerged in a solvent that acts as an electrolyte. The separator separates the anode and the cathode but permits the lithium ions to pass through it. Multiple lithium-ion cells are placed in a cell holder which is further enclosed in a housing. The housing as well as the cell holder of the battery pack is generally made of a thermoplastic material.
[0003] With better efficiency of the li-ion cells, design challenges related to high temperature arise and sometimes excess temperature rise may ignite flame in the lithium-ion cell with extreme high temperature. The thermoplastic cell holder used in lithium-ion batteries are not capable of retarding the flame propagation sufficiently from one cell module to another cell module. Expansion of flames within the battery pack results in excess pressure generation in the battery pack. The excess pressure built up inside the battery pack results in deformation of the battery pack and malfunction. Many lithium-ion batteries are provided with a sacrificial member, which melts down and creates a space between the two cell modules, but this does not ensure the arrest of propagation of flames to other modules effectively. In some events, pressure created inside the battery pack may lead to explosion, which may be life threatening for the user of the automobile.

BRIEF DESCRIPTION OF THE DRAWINGS

[0004] The details are described with reference to an embodiment of a battery pack along with the accompanying figures. The same numbers are used throughout the drawings to reference similar features and components.
[0005] Figure 1 exemplarily illustrate perspective views of a battery pack, as pear an embodiment of the present invention.
[0006] Figure 2 exemplarily illustrates an exploded perspective view of the battery pack illustrated in Figure 1, in accordance with an embodiment of the main application.
[0007] Figure 3 exemplarily illustrates an exploded perspective view of the battery pack illustrated in Figure 1, in accordance with an embodiment of the present application.
[0008] Figure 4a exemplarily illustrates a corrugated first partition structure, in accordance with an embodiment of the present application.
[0009] Figure 4b exemplarily illustrates a corrugated second partition structure, in accordance with an embodiment of the present application.
[00010] Figure 5a exemplarily illustrates a perspective view of the assembly of the corrugated first partition structure and the corrugated second partition structure in a cell module holder within the battery pack.
[00011] Figure 5b exemplarily illustrates a top view of the assembly of the corrugated first partition structure and the corrugated second partition structure in a cell module holder within the battery pack.
[00012] Figure 6 exemplarily illustrates a horizontally exploded view of the battery pack, in accordance with an embodiment of the present application.
[00013] Figure 7 exemplarily illustrates an exploded view of a third partition structure along with the battery pack, in accordance with an embodiment of the present application.
[00014] Figure 8 exemplarily illustrates an exploded view of the third partition structure having an insert structure and a plurality of supporting structure.

DETAILED DESCRIPTION

[00015] To prevent expansion of flame in the lithium-ion batteries, few lithium-ion batteries use a high temperature insulating material which adds extra cost to the battery. In addition, packaging of large number of the lithium-ion cells in the battery pack in a limited space is a challenging task as it requires the cell holders, the separators, and the cell modules to be dimensionally stable, mechanically robust and impact resistance over a wide temperature range so that it is able to retard the flame propagation within the battery pack. Also, a closely packed cell in the battery pack requires a reduction of space and cost for fulfilling the packaging requirement. The above-mentioned problems are very critical and therefore, should be mitigated for the safety and health of the battery pack. Therefore, there is a need of an improved design of a compact battery pack for a device which is safe, secure and stable from thermal runaway effects and overcomes all of the problems cited above as well as other problems of known art.
[00016] The present application is a patent of addition of the patent application number 202041028936. Henceforth patent application number 202041028936 is referred as “Main application” for the purpose of brevity. To provide a secure and closely packed battery, the main application discloses about a battery pack that is configured with at least a plurality of partition structure configured to separate a plurality of cell units, the plurality of partition structure includes at least a first partition structure and at least a substantially orthogonally disposed third partition structure being adapted to prevent flame propagation to the other cell unit of the battery pack.
[00017] “The Main application”, further in an embodiment of the present subject matter discloses that the at least one first partition structure is adapted to vertically separate one row of the plurality of cell units from the rest of the rows of the plurality of cell units, and the at least one third partition structure is adapted to horizontally separate the cell module from a battery housing cover.
[00018] However, since first partition structure is capable of isolating only one row of cell units from the other rows of the cell units, thereby the cell units of each row still remain in close contact with the other cell units of the same row. Such close contact between two cell units does not ensure the effective arrest of propagation of flames within a row of cell units. In some events, due to such propagation of flames within a row of cell units, pressure may be created inside the battery pack, which further may lead to explosion, and thereby life-threatening accidents.
[00019] The present application discloses a subject matter that has been devised in view of the above circumstances as well as solving other problems of the known art.
[00020] The present subject matter in an embodiment discloses about a battery pack for a powered device. The battery pack comprises of a plurality of cells forming a cell module, a cell module holder for holding the cell module, and a plurality of partition structures configured to prevent flame propagation between the plurality of cells of the cell module and external to the battery pack.
[00021] As per an aspect of the present embodiment, the plurality of partition structures includes at least one first partition structure and at least one second partition structure being configured to prevent flame propagation to a plurality of cells of the cell module and at least one third partition structure being adapted to prevent flame propagation to the external of the battery pack.
[00022] As per another aspect of the present embodiment, the least one third partition structure is disposed orthogonal to the plurality of cells, the at least one first partition structure, and at least one second partition structure.
[00023] As per another aspect of the present embodiment, the cell module is disposed in the cell module holder forming a plurality of rows and columns. The at least one first partition structure is disposed vertically between the plurality of rows of the plurality of cells, and the at least one second partition structure is disposed vertically between the plurality of columns of the plurality of cells.
[00024] As per another aspect, at least one first partition structure includes at least one first cut out, formed by removal of material on a bottom portion of the at least one first partition structure. The at least one second partition structure includes at least one second cut out, formed by removal of material on a top portion of the at least one second partition structure.
[00025] The at least one first cut out of the at least one first partition structure being configured to perpendicularly receive at least one second cut out of the at least one second partition structure, forming a plurality of isolated cell housing, thereby isolating one cell from the rest of plurality of cells. Further, the at least one first partition structure and the at least one second partition structure are together received by a cell module holder. The shape of the at least one first partition structure and the at least one second partition structure conforms to a longitudinal surface profile or a shape of each of the plurality of cells of the cell module.
[00026] Another embodiment of the present subject matter has a corrugated first partition structure and a corrugated second partition structure, which acts as a partition structure having compact packaging of the cell module as it occupies less space compared to other partition structures. Unlike other partition structures, the corrugation provided on the first partition structure adds rigidity and strength to the first partition structure and enables the structure to occupy an interstitial space between the cell units. The flexible nature of the first partition structure and the second partition structure helps it in easily adjusting between the cell units. The partition structure disposed between the two-cell unit in the battery pack is made up of a metal such as stainless steel. The isolated housing formed by the first partition structure and the second partition structure acts as a wall and thus restricts the flame propagation from one cell unit to another cell units within the battery pack. In comparison to the thermoplastics used in conventional battery packs to arrest the flame propagation, stainless steel is very stable in nature and has very good flexibility. Stainless steel has a very high melting point which helps in withstanding a higher flame temperature and restricts the propagation of flame within the cell module.
[00027] According to another embodiment of the present subject matter, the thickness of the first partition structure and the second partition structure is made up of stainless-steel lies in the range of 0.2 mm to 2 mm. This thickness provides a compact packaging of the first structure and the second structure without compromising the properties of the first partition structure and the second partition structure, its rigidity and strength for the purpose of retarding the flame within in the battery pack.
[00028] According to another embodiment of the present subject matter, a plurality of the third partition structure is disposed on a top portion and on a bottom portion of the cell module. The third partition structure is adapted to locally restrict the flames inside the battery pack and thus acts as a wall placed on the top and the bottom portion of the battery pack. In the present embodiment, the third partition structure includes plurality of stainless-steel insert moulded with a plurality of supporting structure on both sides of the insert structure. The insert structure is made up of stainless-steel having poor thermal conductivity, high melting point and high tensile strength. The insert structure is provided with metal profiles so as to maintain the stiffness and strength of the insert structure and restricts it from bending. However, the insert structure can be made up of any material exhibiting poor thermal conductivity, high melting point and high tensile strength. For the purposes of maintaining strength, rigidity and life of the insert structure, a plurality of elevated surface is formed on the surface of the insert structure on both the sides. The elevated surface so formed around a centrally disposed cavity is designed with a rectangular shape with rounded ends placed in the center of the insert structure. However, the centrally disposed cavity can be of different shapes depending on the structure of the cell module.
[00029] According to another embodiment of the present subject matter, the insert structure is moulded with the plurality of supporting structures on both sides of the insert structure to prevent it from making any electrical contacts with the terminals of the plurality of cell modules, thus safeguarding the battery pack from short circuit. The plurality of supporting structure is made up of plastic material. The supporting structure can be made up of any insulating material having high dielectric strength instead of plastic. The plurality of supporting structure includes a plurality of projections like that of a comb to support the insert structure. In the present embodiment, four supporting structures are placed at the corners of the insert structure, the plurality of projections are facing to the center of the insert structure.
[00030] According to yet another embodiment of the present subject matter, the battery pack may have a cell-to-cell partition structure with a plurality of stainless-steel cell profile conforming sheet to prevent the propagation of flame between the cell modules.
[00031] According to yet another embodiment of the present subject matter, the plastic structure is assembled on the cell module for insulation and then the metal sheet is assembled on the top of the plastic structure by means of a glue or hot sealing. In another embodiment, instead of adding a third partition structure, the thickness of the housing is increased, or the material of the housing is changed so that the flame is restricted inside the housing. The embodiments of the present invention will now be described in detail with reference to an embodiment in the battery pack in an electric vehicle along with the accompanying drawings.
[00032] Exemplary embodiments detailing features regarding the aforesaid and other advantages of the present subject matter will be described hereunder with reference to the accompanying drawings. Various aspects of different embodiments of the present invention will become discernible from the following description set out hereunder. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. 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. Further, it is to be noted that terms “upper”, “down”, “right”, “left”, “front”, “forward”, “rearward”, “downward”, “upward”, “top”, “bottom”, “exterior”, “interior” and like terms are used herein based on the illustrated state or in a standing state of the two wheeled vehicles with a driver riding thereon. Furthermore, arrows wherever provided in the top right corner of figure(s) in the drawings depicts direction with respect to the vehicle, wherein an arrow F denotes front direction, an arrow R indicates rear direction, an arrow Up denotes upward direction, an arrow Dw denotes downward direction, an arrow RH denotes right side, and an arrow LH denotes left side. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
[00033] Figure 1 exemplarily illustrate perspective views of a battery pack 100, as pear an embodiment of the present invention. The present configuration is applicable to any battery pack 100 having a cell module 202 (shown in Fig. 2). The battery pack 100 is enclosed in a battery housing cover 101, which is a box like structure, preferably having at least six sides of a housing. The battery housing cover 101 can be a rectangle or a square in shape.
[00034] Figure 2 exemplarily illustrates an exploded perspective view of the battery pack illustrated in Figure 1, in accordance with an embodiment of the main application. The Lithium-ion battery 200 (hereinafter battery) includes a cell module holder 203, a cell module 202, a plurality of partition structures (201,211) disposed inside the battery housing cover 101, a rear housing cover 206, and a front housing cover 205. The cell module holder 203 accommodates the cell module 202. The cell module holder 203 includes an upper part and a lower part such that the cell module 202 is disposed sandwiched between the two parts. The upper part and the lower part are provided with a plurality of slots (not shown) to accommodate each cell from the cell module 202 to form a closely packed cell cluster arranged either in series, or in parallel to each other or in zig zag manner. However, configurations of the cell module 202 are not limited to above-mentioned structure and can have many other configurations.
[00035] Further, a rear part of the battery housing cover 101 is closed by the battery rear housing cover 206. The rear housing cover 206 is a mesh like structure (not shown) provided for allowing cooling air from the atmosphere inside the battery pack 200. This is done to keep the temperature of the battery pack 200 from rising by providing cooling by natural means. A front part of the battery pack 200 is provided with a board having other electrical connections (not shown) necessary for the operation of the battery pack 200. These components are essential for connecting the battery pack 100 to an external terminal (not shown) for delivering electricity from the battery pack 100. The front part of the battery pack 200 along with the board having electrical connections is further covered by the front housing cover 205 to secure and package the whole battery pack 200 in one part.
[00036] The plurality of partition structures is configured in the battery 200 in such a manner, to separate the cell units 209 from each other in a secure way for preventing propagation of potential fire inside the battery. The plurality of partition structure includes at least a first partition structure 201 and at least a third partition structure 211. The at least a first partition structure 201 is adapted to vertically separate or isolate the cell module 202, and the at least a third partition structure 211 is adapted to horizontally separate or isolate the cell module 202 from the battery housing cover 101. The plurality of cell module 202 is disposed in the cell module holder 203 forming a plurality of rows and columns. The at least a first partition structure 201 is disposed vertically interspaced between the plurality of rows in the interstitial space. The at least first partition structure 201 is disposed between the plurality of rows conforming to the shape of each cell in the cell module 202. The cell module holder 203, the cell module 202, the third partition structure 211 and the first partition structure 201 are closely packed in a layout and is disposed inside the battery housing cover 101.
[00037] However, since the first partition structure 201 can isolate only one row of cell units 209 from the other rows of the cell units 209, thereby the cell units 209 of each row still remain in close contact with the other cell units 209 of the same row. Such close contact between two cell units 209 does not ensure the effective arrest of propagation of flames within same row of cell units 209. In some events, due to such propagation of flames within a row of cell units 209, pressure may be created inside the battery pack, which further may lead to explosion, and thereby life-threatening accidents.
[00038] Figure 3 exemplarily illustrates an exploded perspective view of the battery pack 100 illustrated in Figure 1, in accordance with an embodiment of the present application. The present subject matter in an embodiment discloses about a battery pack 100 for a powered device. The battery pack 100 comprises of a plurality of cells 209 forming a cell module 202, a cell module holder 203 for holding the cell module 202, and a plurality of partition structures (201, 301, 211) configured to prevent flame propagation between the plurality of cells 209 of the cell module 202 and external to the battery pack 100.
[00039] The plurality of partition structures (201, 301, 211) includes at least one first partition structure 201 and at least one second partition structure 301 being configured to prevent flame propagation to a plurality of cells 209 of the cell module 202 and at least one third partition structure 211 being adapted to prevent flame propagation to the external of the battery pack 100.
[00040] The least one third partition structure 211 is disposed orthogonal to the plurality of cells 209, the at least one first partition structure 201, and at least one second partition structure 301.
[00041] The cell module 202 is disposed in the cell module holder 203 forming a plurality of rows and columns. The at least one first partition structure 201 is disposed vertically between the plurality of rows of the plurality of cells 209, and the at least one second partition structure 301 is disposed vertically between the plurality of columns of the plurality of cells 209.
[00042] Further, the cell module holder 203 holds the cells of the cell module 202 and ensures that the cell module 202 are closely packed. This compact packaging reduces the size of the battery pack (not shown) which is utmost important in the electric vehicles and addresses the problem of a space constraint. The cell module 202 are configured within the cell module holder 203 to effectively be disposed in the interstitial space present in the cell module holder 203. These cell module 202 are connected electrically to produce the power required for the traction of the electric vehicle (not shown).
[00043] Figure 4a exemplarily illustrates a corrugated first partition structure 201, in accordance with an embodiment of the present application. Figure 4b exemplarily illustrates a corrugated second partition structure 301, in accordance with an embodiment of the present application.
[00044] Both the first partition structure 201 and the second partition structure 301 are made up of stainless-steel. Stainless-steel provides rigidity and strength to the first partition structure 201 and the second partition structure 301, which is required to act as safe and secure wall between the two cell units 209 (shown in Figure 3) within the battery pack (shown in Figure 2). Stainless steel is very stable in nature and has very good flexibility which facilitates placement of the first partition structure 201 and the second partition structure 301 in between the cell units 209. As stainless steel has a very high melting point, it can withstand very high flame temperature and thus does not melt in case of thermal runaway or fire, thereby restricting the propagation of flame effectively to other cell unit (not shown). In addition, stainless steel has very low thermal conductivity which ensures that no heat or flame is conducted in the neighbouring cell unit 209. The thickness of each sheet of the first partition structure 201 and the second partition structure 301 made up of stainless-steel lies in the range of 0.2 mm to 2 mm. This thickness may vary according to the application of the battery pack 100 (shown in Figure 1). This thickness provides the compact packaging of the battery pack 100 along with the first partition structure 201 and the second partition structure 301 without compromising the properties of first partition structure 201 and the second partition structure 301 made up of stainless-steel having rigidity and strength. However, the first partition structure 201 and the second partition structure 301 can be made up of any metal having high melting point, high tensile strength, and poor thermal conductivity.
[00045] The first partition structure 201 and the second partition structure 301 as shown in figure. 4a to figure 4b has corrugated surface on both the edges of the structure, when viewed from the side of any one of the first partition structure 201 or the second partition structure 301. These corrugations are provided to ensure the separation of one cell unit 209 with another cell unit 209 and allowing no contact between the two cell units 209 and still maintain the compactness of the battery pack 100. Along with individual housing 300 of each of the cell unit 209, corrugated shape of the first partition structure 201 and the second partition structure 301 additionally restricting the flame propagation disposed between each cell unit 209. This also reduces the overall cost of the battery pack 100. The corrugated part of the first partition structure 201 and the second partition structure 301 also provides flexibility while placing the structure 201 within the interstitial spaces easily.
[00046] Further, each of the first partition structure 201 includes at least one first cut out 201a, formed by removal of material on a bottom portion of the at least one first partition structure 201. The at least one second partition structure 301 includes at least one second cut out 301a, formed by removal of material on a top portion of the at least one second partition structure 301.
[00047] The at least one first cut out 201a of the at least one first partition structure 201 being configured to perpendicularly receive at least one second cut out 301a of the at least one second partition structure 301, forming a plurality of isolated cell housing 300, thereby isolating one cell 209 from the rest of plurality of cells 209. Further, the at least one first partition structure 201 and the at least one second partition structure 301 are together received by a cell module holder 203. The shape of the at least one first partition structure 201 and the at least one second partition structure 301 conforms to a longitudinal surface profile or a shape of each of the plurality of cells of the cell module 202.
[00048] Figure 5a exemplarily illustrates a perspective view of the assembly of the corrugated first partition structure 201 and the corrugated second partition structure 301 in a cell module holder within the battery pack 100. Figure 5b exemplarily illustrates a top view of the assembly of the corrugated first partition structure and the corrugated second partition structure in a cell module holder within the battery pack.
[00049] The first partition structure 201 and the second partition structure 301 together form an isolated housing 300 (shown in Fig. 5a) for each individual cell unit 209 for arresting the propagation of flames from one cell unit 209 to another cell unit 209. The first partition structure 201 and the second partition structure 301 together acts as a wall between each cell units 209. The first partition structure 201 and the second partition structure 301 are disposed between the available interstitial spaces between the two cell units 209 ensuring that the compactness of the battery pack 100 is maintained. In case of an accident or an undesirable impact on the battery 100, if one cell unit 209 gets affected due to thermal runaway, fire or a short circuit, these impacts are not transmitted to another cell unit 209 due to the placement of the first partition structure 201 and the second partition structure 301. The first partition structure 201 and the second partition structure 301 where the impact had started and does not allow an excess of pressure to be build up in the battery pack 100. This excess pressure if gets build up inside the battery pack 100, may damage the entire battery 100 or even result in a blast or fire. So, the first partition structure 201 and the second partition structure 301 both become crucial elements in the battery pack 100 from safety point of view. As per another aspect, the guiding of the cell module 202 also provides stability for each of the cell unit 209 to withstand undesirable vibrations or shock loads.
[00050] Figure 6 exemplarily illustrates a horizontally exploded view of the battery pack 100, in accordance with an embodiment of the present application. The battery pack 100 having a battery set 210 which includes the cell module 202 (shown in Figure 2) having the plurality of cells 209 (shown in Figure 3), the cell module holder 203 (shown in Figure 3), first partition structure 201 (shown in Figure 3), the second partition structure 301 (shown in Figure 3) and the third partition structure 211 (shown in Figure 2). The battery pack 100 further includes the battery set 210, the battery housing casing 101 to cover a top portion, a bottom portion, and the sides of the battery set 210. The rear part of the battery set 210 is closed by the battery rear housing cover 206. The front part of the battery set 210 is covered by the front housing cover 205 to secure and package the whole battery pack 100 in one part.
[00051] Fig. 7 exemplarily illustrates an exploded perspective view of a plurality of third partition structure 211 along with the battery pack 100, in accordance with an embodiment of the present application. The third partition structure 211 consists of a top portion and a bottom portion. The cell module 202 (not shown in this fig.) in the battery pack 100 are connected in either series or parallel and the electrical connection are taken out from a pair of terminals (not shown).The third partition structure 211 is placed on the top portion and the bottom portion of the cell module (not shown) in the battery set 210 to ensure that the flame propagation within the battery set 210 do not escape the battery pack (not shown). This is done to contain the flame within the battery pack (not shown) in case of any accident, fire or thermal runaway. This is to also ensure that no excess pressure is built up, resulting in explosion, which can damage the battery (not shown) and may even injure the person from the explosion or fire while riding the vehicle. The third partition structure 211 is placed on the top and the bottom portion of the battery set 210 by means of a plurality of snap fits 217 This provides ease of assembly and secures the third partition structure 211 on the battery set 210. However, other means of mounting i.e. fastening, bonding, gluing, welding etc. can also be employed to mount the third partition structure 211 on the battery set 210.
[00052] Fig. 8 exemplarily illustrates an exploded perspective view of the third partition structure 211 having an insert structure 212, a plurality of supporting structure 213, a plurality of elevated surfaces 215, a cavity 218, and a plurality of projections 216. The insert structure 212 acts as a wall and thus restricts the flame from the top and the bottom portion of the battery set (not shown) from coming out of the battery pack (not shown). The insert structure 212 is made up of stainless-steel material having high tensile strength, high melting point, and poor thermal conductivity which helps the insert structure 212 to stop the flame or thermal runaway from propagating out of the battery pack (not shown). However, any metal having above-mentioned properties can be used as a metal part in the third partition structure 211. In addition to this, the insert structure 212 has the plurality of elevated surface 215 formed around the cavity 218 having a rectangular shape with rounded ends placed in the centre of the insert structure 212 on both sides of its surface which prevents the bending of the insert structure 212 and maintains the stiffness of the insert structure 212. Since the insert structure 212 is a metal, it conducts electricity. The insert structure 212 when comes in contact with the terminals of the cell module (not shown) may result in a short circuit. To prevent the short circuit in the battery pack (not shown), the plurality of supporting structure 213 made up of plastic is provided on both the sides of the insert structure 212. The supporting structure 213 being an insulator acts as a wall between the insert structure 212 and the terminals. The supporting structure 213 as per an embodiment is moulded on the insert structure 212 to form a third partition structure 211. As per another embodiment, the supporting structure 213 is enmoulded on the insert structure 212.The supporting structure 213 is enmoulded on both the sides of the insert structure 212. Instead of placing a single integrated supporting structure, the plurality of supporting structure 213 is placed in proximity to the corners of the insert structure 212, in the present embodiment four plastic structure 213 are placed at the corners of the insert structure 212 facing the canter of the insert structure 212. The plurality of supporting structure 213 includes the plurality of projections 216 like that of a comb to support the insert structure 212. Also, any insulating material having high dielectric strength can be used in place of plastic material to provide insulation, strength, and stiffness to the third partition structure 211.
[00053] Many modifications and variations of the present subject matter are possible in the light of above disclosure. Therefore, within the scope of claims of the present subject matter, the present disclosure may be practiced other than as specifically described.

 
List of Reference numerals:

100: Battery pack
101: Battery housing cover
200: Exploded view of lithium-ion battery
201: First partition structure
201a: First cut-out
202: Cell module

203: Cell module holder

205: Battery front housing cover

206: Battery rear housing cover

209: Single cell unit

209: Single cell

210: Battery set
301: Second partition structure
302: Second cut-out
211: Third partition structure
212: insert structure
213: plurality of supporting structure
215: plurality of metal profiles
216: plurality of projections
217: snap fit
218: Cavity

300: Cell housing

, Claims:We claim:

1. A battery pack (100) for a powered device, said battery pack (100) comprising:
a plurality of cells (209) forming a cell module (202);
a cell module holder (203) for holding said cell module (202); and
a plurality of partition structures (201, 301, 211) configured to prevent flame propagation between said plurality of cells (209) of said cell module (202);
wherein said plurality of partition structures (201, 301, 211) includes a first partition structure (201) and a second partition structure (301) being configured to prevent flame propagation within said cell module (202).
2. The battery pack (100) as claimed in claim 1, wherein said plurality of cell (209) being disposed within said cell module holder (203) in a plurality of rows and columns.
3. The battery pack (100) as claimed in claim 1, wherein said at least one first partition structure (201) being disposed vertically between said plurality of rows of said plurality of cell (209).
4. The battery pack (100) as claimed in claim 1, wherein said at least one second partition structure (301) being disposed vertically between said plurality of columns of said plurality of cell (209).
5. The battery pack (100) as claimed in claim 1, wherein said at least one first partition structure (201) includes at least one first cut out (201a), formed by removal of material on a bottom portion of said at least one first partition structure (201).
6. The battery pack (100) as claimed in claim 1, wherein said at least one second partition structure (301) includes at least one second cut out (301a), formed by removal of material on a top portion of said at least one first partition structure (201).
7. The battery pack (100) as claimed in claim 5, wherein said at least one first cut out (201a) of said at least one first partition structure (201) being configured to perpendicularly receive at least one second cut out (301a) of said at least one second partition structure (301), forming a plurality of isolated cell housing (300), thereby isolating one cell (209) from rest of plurality of cells (209).
8. The battery pack (100) as claimed in claim 7, wherein said at least one first partition structure (201) and said at least one second partition structure (301) are together received by a cell module holder (203).
9. The battery pack (100) as claimed in claim 1, wherein said at least one first partition structure (201) and said at least one second partition structure (301) being adapted to vertically isolate at least one cell (209) of said plurality of cells (209) from rest of said plurality of cells (209) of said cell module (202).
10. The battery pack (100) as claimed in claim 1, wherein said at least one third partition structure (211) being adapted to horizontally isolate said cell module (202) from a battery housing cover (101) of said battery pack (100).
11. The battery pack (100) as claimed in claim 3, wherein a shape of said at least one first partition structure (201) and said at least one second partition structure (301) conforms to a longitudinal surface profile or a shape of each of said plurality of cells (209) of said cell module (202).
12. The battery pack (100) as claimed in claim 1, wherein each one of said at least one first partition structure (201) and said at least one second partition structure (301) having a thickness in a range of 0.2 mm to 2 mm.
13. The battery pack (100) as claimed in claim 1, wherein at least one third partition structure (211) being disposed orthogonal to said plurality of cells (209), and said first partition structure (201), and said second partition structure (301).
14. The battery pack (100) as claimed in claim 13, wherein said at least one third partition structure (211) being a pair of third partition structures (211), each of said pair of third partition structures (211) being disposed on one of a top portion and a bottom portion of said cell module (202) and wherein said pair of third partition structures (211) being adapted to locally restrict flames inside said battery pack (100).
15. The battery pack (100) as claimed in claim 13, wherein said each of said pair of third partition structures (211) includes an insert structure (212) enmoulded in a plurality of supporting structures (213) on both sides of said insert structure (212).
16. The battery pack (100) as claimed in claim 15, wherein said insert structure (212) being made of stainless steel.
17. The battery pack (100) as claimed in claim 15, wherein said insert structure (212) being provided with a plurality of elevated surfaces (215) formed around a centrally disposed cavity (218), wherein said cavity (218) having a rectangular shape with rounded ends and formed in a centre of said insert structure (212) to maintain stiffness of said insert structure (212).
18. The battery pack (100) as claimed in claim 15, wherein said plurality of supporting structures (213) having a plurality of projections (216) to support said insert structure (212).
19. The battery pack (100) as claimed in claim 1, wherein each one of said at least one first partition structure (201) and said at least one second partition structure (301) being a plurality of cell profile conforming sheet (201) adapted to prevent propagation of flame between said plurality of cells (209) of said cell module (202).
20. The battery pack (100) as claimed in claim 1, wherein said at least one first partition structure (201) and said at least one second partition structure (301) being corrugated structures.