Cell assembly and battery pack including the same

Abstract

The present invention relates to a cell assembly and a battery pack including the same. The cell assembly of the present invention includes a cell block including a plurality of cells, and a pair of reinforcing plates coupled to both side surfaces of the cell block so as to support both side surfaces of the cell block and including protrusions on the outer surfaces. The reinforcing plates include a first reinforcing plate coupled to one side of the cell block and a second reinforcing plate coupled to the other side of the cell block, and the outer surface of the first reinforcing plate and the outer surface of the second reinforcing plate have a shape that meshes with each other. Further, the battery pack of the present invention includes a cell assembly and a pack case including a housing portion in which the cell assembly is housed. The cell assembly includes a pair of reinforcing plates coupled to both sides so as to support the side surfaces. Any pair of cell assemblies housed adjacent to the housing portion are coupled such that the first reinforcing plate and the second reinforcing plate are combined to form one auxiliary partition wall.

Description

Technical Field

[0001] The present invention relates to a cell assembly and a battery pack including the same. More specifically, the present invention relates to a cell assembly to which reinforcing plates for supporting each side surface are applied on both sides, and a battery pack for accommodating the same.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0049575 filed on April 14, 2023, and all contents disclosed in the literature of the Korean patent application are included as part of this specification.

Background Art

[0003] Types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, nickel zinc batteries, etc. The operating voltage of such a unit secondary battery cell, that is, a unit battery cell, is about 2.5V to 4.2V. Therefore, when a higher output voltage is required, a plurality of battery cells can be connected in series to form a battery pack. Also, depending on the charge and discharge capacity required for the battery pack, a large number of battery cells can be connected in parallel to form a battery pack. Therefore, the number of battery cells included in the battery pack can be variously set according to the required output voltage or charge and discharge capacity.

[0004] For example, when configuring a battery pack by connecting a plurality of battery cells in series / parallel, a cell assembly composed of a plurality of battery cells is first configured.

[0005] FIG. 1 shows one form of a generally used cell assembly 10. The conventional cell assembly 10 includes a cell block 11 in which a plurality of cells are stacked in one direction as shown in the figure, and end plates 12 are coupled to the front and rear of the cell assembly 10, respectively.

[0006] A single battery pack can accommodate a plurality of cell assemblies 10 shown in FIG. 1 above.

[0007] On the other hand, although abnormal phenomena may occur during the charge and discharge process in the cell assembly 10 included in the battery pack, the swelling phenomenon can be cited as one example. The above-mentioned swelling phenomenon is a phenomenon in which the battery cell expands due to gas generated inside the battery cell. The above-mentioned swelling phenomenon can proceed first in each battery cell unit accommodated in the cell assembly 10, and as a result, it affects the entire cell assembly 10. In particular, the above-mentioned swelling phenomenon can proceed throughout the entire cell assembly 10.

[0008] Therefore, even if the swelling phenomenon occurs in each cell assembly 10 stored in the pack case, a new method is required that can maximize the suppression of the deformation of the form of the cell assembly 10.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0010] Therefore, the present invention was devised to solve the above problems, and an object thereof is to provide a structure that can reinforce the side surface of the cell assembly.

[0011] In addition, an object of the present invention is to suppress the swelling phenomenon of the cell assembly stored in the pack case.

[0012] Other objects and advantages of the present invention can be understood from the following description and will become more apparent from the embodiments of the present invention. It can also be easily understood that the objects and advantages of the present invention can be realized by the means shown in the claims and combinations thereof.

Means for Solving the Problems

[0013] According to the present invention, there is provided a cell assembly including a cell block including a plurality of cells, and a pair of reinforcing plates coupled to both side surfaces of the cell block so as to support both side surfaces of the cell block and including protrusions on the outer surface, the reinforcing plates including a first reinforcing plate coupled to one side of the cell block and a second reinforcing plate coupled to the other side of the cell block, wherein the outer surfaces of the first reinforcing plate and the second reinforcing plate have a shape that meshes with each other.

[0014] The first reinforcing plate may include the protrusion at a lower portion of the outer surface and an upper step portion above the protrusion, and the second reinforcing plate may include the protrusion at an upper portion of the outer surface and a lower step portion below the protrusion.

[0015] The first reinforcing plate may include a horizontal insertion bar at an upper portion of the outer surface, and the second reinforcing plate may include a horizontal insertion hole at an upper portion of the outer surface, and the horizontal insertion hole of the second reinforcing plate may be formed corresponding to the horizontal insertion bar of the first reinforcing plate so that the horizontal insertion bar of the first reinforcing plate can be inserted therein.

[0016] The first reinforcing plate may further include a horizontal insertion hole at a lower portion of the outer surface, and the second reinforcing plate may further include a horizontal insertion bar at a lower portion of the outer surface, and the horizontal insertion hole of the first reinforcing plate may be formed corresponding to the horizontal insertion bar of the second reinforcing plate so that the horizontal insertion bar of the second reinforcing plate can be inserted therein.

[0017] The first reinforcing plate includes a horizontal insertion hole at the lower part of the outer surface, the second reinforcing plate includes a horizontal insertion bar at the lower part of the outer surface, and the horizontal insertion hole of the first reinforcing plate can be formed corresponding to the horizontal insertion bar of the second reinforcing plate so that the horizontal insertion bar of the second reinforcing plate can be inserted.

[0018] The first reinforcing plate includes a vertical insertion bar at the upper stepped portion, the second reinforcing plate includes a vertical insertion hole at the lower stepped portion, and the vertical insertion hole of the second reinforcing plate can be formed corresponding to the vertical insertion bar of the first reinforcing plate so that the vertical insertion bar of the first reinforcing plate can be inserted.

[0019] The first reinforcing plate further includes a vertical insertion hole at the upper stepped portion, the second reinforcing plate further includes a vertical insertion bar at the lower stepped portion, and the vertical insertion hole of the first reinforcing plate can be formed corresponding to the vertical insertion bar of the second reinforcing plate so that the vertical insertion bar of the second reinforcing plate can be inserted.

[0020] The first reinforcing plate includes a vertical insertion hole at the upper stepped portion, the second reinforcing plate includes a vertical insertion bar at the lower stepped portion, and the vertical insertion hole of the first reinforcing plate can be formed corresponding to the vertical insertion bar of the second reinforcing plate so that the vertical insertion bar of the second reinforcing plate can be inserted.

[0021] The protruding portion can be formed to extend along the longitudinal direction of the cell assembly.

[0022] The protruding portion can have a hollow structure.

[0023] According to the present invention, there is provided a battery pack including the above cell assembly and a pack case including a housing portion for housing the cell assembly, the cell assembly including a pair of reinforcing plates coupled to both sides so as to support the side surfaces, and any pair of cell assemblies housed adjacent to the housing portion being coupled such that the first reinforcing plate and the second reinforcing plate are joined to form one auxiliary partition wall.

[0024] The auxiliary partition wall can be coupled to the pack case by a coupling member that penetrates the auxiliary partition wall and is coupled to the bottom of the pack case.

[0025] The protruding portion includes a coupling hole through which the coupling member can penetrate, and the coupling holes included in the first reinforcing plate and the second reinforcing plate included in the auxiliary partition wall can be provided at corresponding positions to each other.

[0026] The pack case includes a base plate that supports the lower part of the cell assembly. The base plate corresponds to the position of the coupling hole included in the auxiliary partition wall and includes a bottom groove formed so that the coupling member can be inserted. The auxiliary partition wall can be coupled to the base plate by the coupling member that penetrates the coupling hole and is inserted into the bottom groove.

[0027] The first reinforcing plate includes the protruding portion at the lower part of the outer surface, and includes an upper stepped portion formed by the protruding portion at the upper part of the protruding portion. The second reinforcing plate includes the protruding portion at the upper part of the outer surface, and may include a lower stepped portion formed by the protruding portion at the lower part of the protruding portion.

[0028] The first reinforcing plate includes a horizontal insertion bar at the upper part of the outer surface. The second reinforcing plate includes a horizontal insertion hole at the upper part of the outer surface. The first reinforcing plate of any one cell assembly included in the auxiliary partition wall can be coupled to the second reinforcing plate by inserting the horizontal insertion bar into the horizontal insertion hole included in the second reinforcing plate of another cell assembly.

[0029] The first reinforcing plate includes a vertical insertion bar at the upper stepped portion. The second reinforcing plate includes a vertical insertion hole at the lower stepped portion. The first reinforcing plate of any one cell assembly included in the auxiliary partition wall can be coupled to the second reinforcing plate by inserting the vertical insertion bar into the vertical insertion hole included in the second reinforcing plate of another cell assembly.

Advantages of the Invention

[0030] According to the present invention, the swelling phenomenon of the cell assembly housed in the pack case can be effectively suppressed.

[0031] Further, the present invention can improve the assembly efficiency of the pack case by removing a separate side wall structure for separating the cell assemblies from the pack case.

Brief Description of the Drawings

[0032]

Figure 1

Figure 2

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Figure 8

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Figure 10

Figure 11

Figure 12

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Figure 14

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Figure 16

Figure 17

Figure 18

Figure 19

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Figure 22

Figure 23

Best Mode for Carrying Out the Invention

[0033] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before that, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary or dictionary meanings, but should be construed as meanings and concepts consistent with the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the terms in order to explain his own invention in the best way.

[0034] Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiment of the present invention and do not represent all of the technical ideas of the present invention. Thus, there may be various equivalents and modifications that can replace them at the time of this application.

[0035] In addition, in the description of the present invention, when it is determined that a specific description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

[0036] Embodiments of the present invention are provided to more fully explain the present invention to an ordinary technician. Therefore, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or shown schematically for a clearer explanation. Accordingly, the sizes and ratios of the respective components do not fully reflect the actual sizes and ratios.

[0037] The present invention relates to a battery pack that houses a cell assembly 100.

[0038] The battery pack of the present invention includes a cell assembly 100 including a cell block 110 including a plurality of cells, and a pack case 200 including a housing portion A in which the cell assembly 100 is housed.

[0039] The above cells can be classified into cylindrical cells, prismatic cells, and pouch cells according to the form of the electrode assembly and the battery case.

[0040] The above cylindrical cell has an electrode assembly wound in a roll shape and is inserted into a cylindrical battery case.

[0041] The above prismatic cell can be in a stack form in which the electrode assembly is stacked with electrodes and separators alternately laminated, and can be in a stack-folding form in which electrodes and the like are provided on a sheet-like separator folded at regular intervals.

[0042] In the above rectangular cell, the electrode assembly is inserted into a square box-shaped battery case.

[0043] In the above pouch-type cell, the electrode assembly can be in a stacked form or a stack-folding form.

[0044] In the above pouch-type cell, the electrode assembly is inserted into a pouch-shaped battery case. Therefore, the above cell block can include any one of a cylindrical cell, a rectangular cell, and a pouch-type cell.

[0045] The above cell assembly 100 is composed of a cell block 110 and end plates 120 respectively coupled to the front and rear of the above cell block 110, and includes reinforcing plates 130 respectively coupled to both sides.

[0046] According to some embodiments, the above end plate 120 may further include terminals electrically connected to the above cell block 110. Each cell assembly 100 can be connected via the above terminals.

[0047] According to some embodiments, the above cell assembly 100 may further include a module frame surrounding the above cell block 110 so that each above cell can be protected from external impacts. At this time, the above module frame may be provided to support or protect only a part of the above cell block 110, or may be provided at all parts of the exposed cell block 110 to completely block the above cell block 110 from the outside.

[0048] According to some embodiments, the above module frame may further include terminals electrically connected to the above cell block 110. Each cell assembly 100 can be connected via the above terminals.

[0049] The battery pack of the present invention may further include an upper cover coupled to the above pack case 200 so as to cover the upper part of each cell assembly 100 accommodated in the above pack case 200.

[0050] Since the upper cover described above corresponds to a known technique, a detailed description thereof in the present invention will be omitted.

[0051] FIG. 2 shows a pack case 200 included in the battery pack of the present invention. The pack case 200 includes a base plate 210 as shown in FIG. 2.

[0052] The base plate 210 corresponds to the bottom of the pack case 200 and serves to support the lower part of the cell assembly 100 seated thereon.

[0053] A bottom groove 210a may be formed in the base plate 210 so that a coupling member B can be inserted therein for screw coupling.

[0054] According to some embodiments, the pack case 200 may include side walls 230.

[0055] The side walls 230 are vertically coupled along the periphery of the edge of the base plate 210 and serve to surround and protect the outer surface of the cell assembly 100 located on the base plate 210.

[0056] The pack case 200 includes an accommodation portion A in which the cell assembly is accommodated.

[0057] The cell assembly 100 is seated in the accommodation portion A.

[0058] According to some embodiments, the accommodation portion A may be the inner space of the pack case 200 surrounded by the side walls 230.

[0059] According to some embodiments, the pack case 200 may include a main partition 220.

[0060] The main partition wall 220 is formed to extend across the base plate 210 and is vertically coupled to the central portion of the base plate 210. The main partition wall 220 serves to largely partition and divide the internal space of the pack case 200 into two regions, and may also serve to insert and protect various conducting wires used inside the pack case 200 therein.

[0061] According to some embodiments, the accommodating portion A may be formed by being partitioned by the main partition wall 220 and the side wall 230. At this time, the pack case 200 includes a pair of accommodating portions A on both sides of the main partition wall 220, and a plurality of cell assemblies 100 may be arranged and seated side by side along the longitudinal direction d3 of the main partition wall in any one of the accommodating portions A.

[0062] The cell assemblies 100 seated on both sides of the main partition wall 220 may be arranged to be symmetric with respect to each other with the main partition wall 220 as a reference.

[0063] FIGS. 3 to 15 relate to a battery pack according to a first embodiment of the present invention, FIGS. 16 to 19 relate to a battery pack according to a second embodiment of the present invention, and FIGS. 20 to 23 each relate to a battery pack according to a third to sixth embodiment of the present invention. Hereinafter, the battery pack of the present invention will be described for each embodiment with reference to the drawings.

[0064] For reference, the front and rear, up and down, left and right directions designating relative positions used in the following description are for assisting in understanding the invention, and are based on the directions shown in the drawings unless otherwise defined.

[0065] Also, the longitudinal direction of a certain configuration refers to the direction corresponding to the plane having the longest length of the said configuration shown in the drawing with reference to the horizontal direction, and the width direction of a certain configuration is defined as the direction orthogonal to the longitudinal direction with reference to the horizontal direction.

[0066] (First Embodiment) FIG. 3 is a perspective view of the cell assembly 100 included in the battery pack according to the first embodiment of the present invention, FIG. 4 is a plan view of the cell assembly 100 of FIG. 3, and FIGS. 5 to 7 are perspective views showing modified examples of the cell assembly 100.

[0067] FIGS. 3 and 4 are a perspective view and a plan view showing the cell assembly 100 including pouch-type cells.

[0068] As shown in FIG. 3 above, the cell assembly 100 includes a cell block 110 in which a plurality of cells are stacked, and end plates 120 respectively coupled to the front and rear of the cell block 110. At this time, the end plate 120 may further include terminals that can be electrically connected to the cell block 110.

[0069] The cell assembly 100 includes a pair of reinforcing plates 130 coupled to both sides so as to support the side surfaces of the cell block 110.

[0070] The reinforcing plate 130 can be coupled to the end plate 120. At this time, the reinforcing plate 130 can be coupled to the side surface of the end plate 120 by separate screws or the like, or can be fixed to the end plate 120 by an adhesive.

[0071] The battery pack of the present invention is characterized in that the reinforcing plates 130 included on one side of a pair of cell assemblies 100 accommodated adjacent to the pack case 200 are coupled to each other to form one auxiliary partition wall 240.

[0072] The reinforcing plate 130 forms a step and includes a protruding portion 131 protruding from the outer surface.

[0073] As shown in FIG. 3, the protrusion 131 protrudes from one side of the reinforcing plate 130 so as to form a step along the height direction d2 of the cell assembly body, and is formed to extend along the longitudinal direction d1 of the cell assembly body. The protrusion 131 includes a coupling hole 131a that is perforated in the vertical direction so that the coupling member B can pass through, and has a hollow structure with the remaining portion except the coupling hole 131a being empty.

[0074] The coupling member B can be, for example, a bolt having a thread formed on its outer surface.

[0075] It is preferable that the length of the coupling member B is longer than the height of the reinforcing plate 130.

[0076] According to FIG. 3, a plurality of the coupling holes 131a can be formed along the longitudinal direction d1 of the cell assembly body.

[0077] As shown in FIG. 4, the reinforcing plate 130 is composed of a first reinforcing plate 130a coupled to one side of the cell block 110 and a second reinforcing plate 130b coupled to the other side of the cell block 110.

[0078] That is, one cell assembly body 100 is provided with a first reinforcing plate 130a and a second reinforcing plate 130b on both sides respectively.

[0079] There is a difference in the position of the protrusion 131 between the first reinforcing plate 130a and the second reinforcing plate 130b.

[0080] The cell assembly body 100 can include cells in various forms in addition to the pouch-type cell.

[0081] FIG. 5 is a perspective view showing a cell assembly body 100 including a cylindrical cell.

[0082] As shown in FIG. 5, the cell assembly body 100 includes a cell block 110 in which a plurality of cylindrical cells are arranged, and end plates 120 respectively coupled to the front and rear of the cell block 110.

[0083] The cell assembly 100 includes a pair of reinforcing plates 130 coupled to both sides so as to support the side surfaces of the cell block 110.

[0084] The end plate 120 does not need to be limited to the shape of FIG. 5, and any shape that can support the front and rear of the cell block 110 is sufficient.

[0085] The reinforcing plate 130 can be coupled to the end plate 120. At this time, the reinforcing plate 130 can be screw-coupled to the side surface of the end plate 120 by a separate screw or the like, or can be fixed to the end plate 120 by an adhesive.

[0086] FIG. 6 is a perspective view showing the cell assembly 100 including square cells.

[0087] As shown in FIG. 6, the cell assembly 100 includes a cell block 110 in which a plurality of square cells are arranged, and end plates 120 coupled to the front and rear of the cell block 110, respectively.

[0088] The cell assembly 100 includes a pair of reinforcing plates 130 coupled to both sides so as to support the side surfaces of the cell block 110.

[0089] At this time, each square cell is arranged such that its longitudinal direction is horizontal to the longitudinal direction of the end plate.

[0090] The end plate 120 does not need to be limited to the shape of FIG. 5, and any shape that can support the front and rear of the cell block 110 is sufficient.

[0091] The reinforcing plate 130 can be coupled to the end plate 120. At this time, the reinforcing plate 130 can be screw-coupled to the side surface of the end plate 120 by a separate screw or the like, or can be fixed to the end plate 120 by an adhesive.

[0092] FIG. 7 is a perspective view showing another form of the cell assembly 100 including rectangular cells.

[0093] As shown in FIG. 7, the cell assembly 100 includes a cell block 110 in which a plurality of rectangular cells are arranged, and end plates 120 respectively coupled to the front and rear of the cell block 110.

[0094] The cell assembly 100 includes a pair of reinforcing plates 130 coupled to both sides so as to support the side surfaces of the cell block 110.

[0095] At this time, each rectangular cell is arranged such that its longitudinal direction is horizontal to the longitudinal direction of the reinforcing plate 130.

[0096] The end plate 120 does not need to be limited to the shape shown in FIG. 7, and any shape that can support the front and rear of the cell block 110 is sufficient.

[0097] The reinforcing plate 130 can be coupled to the end plate 120. At this time, the reinforcing plate 130 can be screwed to the side surface of the end plate 120 by a separate screw or the like, or fixed to the end plate 120 by an adhesive.

[0098] A pair of reinforcing plates 130 included in one cell assembly 100 have a shape in which the protrusions 131 engage with each other. That is, in one of the reinforcing plates 130, the protrusion 131 is formed at the upper part, and in the other reinforcing plate 130, the protrusion 131 is formed at the lower part.

[0099] FIG. 8 shows a first reinforcing plate 130a coupled to one side of the cell assembly 100. Referring to FIG. 8, in the first reinforcing plate 130a, the protrusion 131 is formed at the lower part of the reinforcing plate 130 and is formed to extend along the longitudinal direction d1 of the cell assembly.

[0100] The protruding portion 131 protrudes so as to form a step on one side of the reinforcing plate 130. The first reinforcing plate 130a includes an upper step portion 133a formed by the upper corner of the protruding portion 131 formed at the lower part. The upper step portion 133a is formed to extend in the longitudinal direction d1 of the cell assembly along the protruding portion 131.

[0101] The first reinforcing plate 130a includes a coupling hole 131a penetrating the protruding portion 131 in the vertical direction. Specifically, the coupling hole 131a is formed on the upper step portion 133a.

[0102] In some embodiments, a plurality of coupling holes 131a are formed at predetermined intervals along the longitudinal direction of the cell assembly 100.

[0103] FIG. 9 shows a second reinforcing plate 130b coupled to the other side of the cell assembly 100. Referring to FIG. 9, in the second reinforcing plate 130b, the protruding portion 131 is formed at the upper part of the reinforcing plate 130 and extends along the longitudinal direction d1 of the cell assembly.

[0104] The second reinforcing plate 130b includes a lower step portion 133b formed by the lower corner of the protruding portion 131 formed at the upper part. The lower step portion 133b is formed to extend in the longitudinal direction d1 of the cell assembly along the protruding portion 131.

[0105] When a pair of cell assemblies 100 are coupled by the reinforcing plate 130, the first reinforcing plate 130a included on one side of one of the cell assemblies 100 is coupled to the second reinforcing plate 130b included in the other cell assembly 100.

[0106] A plurality of coupling holes 131a are formed at predetermined intervals in the protruding portion 131 of the second reinforcing plate 130b, and preferably at positions corresponding to the positions of the coupling holes 131a formed in the protruding portion 131 of the first reinforcing plate 130a with respect to the longitudinal direction d1 of the cell assembly.

[0107] Figure 10 shows the coupling process of a pair of cell assemblies 100 arranged adjacent to each other.

[0108] At this time, a pair of reinforcing plates 130 formed on one side of each cell assembly 100 so as to face each other are coupled such that the protrusions 131 overlap each other alternately. Specifically, the first reinforcing plate 130a of one of the cell assemblies 100 is coupled to the second reinforcing plate 130b of another adjacent cell assembly 100. At this time, the protrusion 131 formed below the first reinforcing plate 130a and the protrusion 131 formed above the second reinforcing plate 130b are coupled to mesh with each other to form an auxiliary partition wall 240.

[0109] Figure 11 shows a pair of reinforcing plates 130 arranged so as to face each other on the side surfaces of a pair of cell assemblies 100 arranged adjacent to each other in FIG. 10.

[0110] Referring to FIG. 11, each protrusion 131 included in the first reinforcing plate 130a and the second reinforcing plate 130b has a shape that meshes with each other. Specifically, one side of the first reinforcing plate 130a facing the protrusion 131 formed above the second reinforcing plate 130b is formed to correspond to the shape of the protrusion 131 of the second reinforcing plate 130b, and one side of the second reinforcing plate 130b facing the protrusion 131 formed below the first reinforcing plate 130a is formed to correspond to the shape of the protrusion 131 of the first reinforcing plate 130a. The first reinforcing plate 130a and the second reinforcing plate 130b can be coupled so that no gap is generated therebetween due to their corresponding shapes. At this time, the lower step portion 133b of the second reinforcing plate 130b is brought into contact with the upper step portion 133a of the first reinforcing plate 130a by the coupling.

[0111] Also, by the above coupling, each coupling hole 131a included in the first reinforcing plate 130a coincides with each coupling hole 131a included in the second reinforcing plate 130b.

[0112] Figure 12 shows the auxiliary partition wall 240 formed by coupling the first reinforcing plate 130a and the second reinforcing plate 130b.

[0113] As shown in FIG. 12, the auxiliary partition wall 240 of the present invention has the first reinforcing plate 130a and the second reinforcing plate 130b joined together without a gap, and the positions of the respective coupling holes 131a of the first reinforcing plate 130a coincide with each other such that each coupling hole 131a communicates with each coupling hole 131a of the second reinforcing plate 130b.

[0114] According to some embodiments, the auxiliary partition wall 240 may include a coupling portion 132 protruding from either one of both ends with respect to the longitudinal direction d1 of the cell assembly. Specifically, the second reinforcing plate 130b having the protruding portion 131 formed thereon among the pair of reinforcing plates 130 forming the auxiliary partition wall 240 includes a coupling portion 132 protruding from either one of the front end portion and the rear end portion.

[0115] The second reinforcing plate 130b may further include an auxiliary coupling hole 132a that is perforated through the coupling portion 132 in the vertical direction.

[0116] According to some embodiments, the auxiliary partition wall 240 may include a screw groove 240a formed such that a screw can be inserted horizontally and coupled to either one of both ends with respect to the longitudinal direction d1 of the cell assembly. Specifically, the screw groove 240a is included at the end of the first reinforcing plate 130a.

[0117] The auxiliary partition wall 240 included in the battery pack of the present invention may be coupled to at least one of the main partition wall 220, the side wall 230, and the base plate 210 of the pack case 200.

[0118] FIG. 13 shows a part of the auxiliary partition wall 240 of FIG. 12 coupled to the pack case 200. (For ease of understanding, although not shown in the drawing, cell blocks 110 and the like are coupled to both sides of the auxiliary partition wall 240.)

[0119] Referring to FIG. 13 above, the main partition wall 220 includes a coupling groove 220a into which the coupling portion 132 of the auxiliary partition wall 240 can be inserted on one side where the auxiliary partition wall 240 is disposed.

[0120] The auxiliary partition wall 240 is installed on the base plate 210 of the pack case 200 such that the coupling portion 132 is inserted into the coupling groove 220a.

[0121] According to some embodiments, the main partition wall 220 may include an auxiliary coupling groove 220a formed corresponding to the position of the auxiliary coupling hole 132a of the inserted coupling portion 132 at the bottom of the coupling groove 220a.

[0122] The auxiliary partition wall 240 may be coupled and fixed to the main partition wall 220 by a screw that passes through the auxiliary coupling hole 132a and is inserted into the auxiliary coupling groove 220a.

[0123] According to some embodiments, the side wall 230 may include a screw hole 230a through which a coupling member B can penetrate horizontally at a position corresponding to the coupling groove 220a of the main partition wall 220.

[0124] In this case, the auxiliary partition wall 240 is installed such that the screw groove 240a included at the end corresponds to the position of the screw hole 230a.

[0125] The auxiliary partition wall 240 may be coupled and fixed to the side wall 230 by a screw that passes through the screw hole 230a and is inserted into the screw groove 240a.

[0126] The cell assembly 100 of the present invention is characterized in that it passes through the auxiliary partition wall 240 vertically and is coupled to the pack case 200 by a coupling member B that is screwed to the bottom of the pack case 200, and the side surface is supported by the coupling member B that passes through the auxiliary partition wall 240.

[0127] FIG. 14 shows the process of inserting the coupling member B into the coupling hole 131a of the auxiliary partition wall 240 in FIG. 13 above.

[0128] Referring to FIGS. 12 and 14 above, the base plate 210 of the pack case 200 includes a bottom groove 210a formed corresponding to the position of the coupling hole 131a of the auxiliary partition wall 240 and is formed so that the coupling member B can be inserted and coupled.

[0129] The auxiliary partition wall 240 passes through the coupling holes 131a of the first reinforcing plate 130a and the second reinforcing plate 130b and is coupled to the base plate 210 by a coupling member B inserted into the bottom groove 210a.

[0130] The coupling member B inserted into the coupling hole 131a of the auxiliary partition wall 240 preferably has a length longer than the height of the auxiliary partition wall 240 so as to be able to pass through the coupling hole 131a and be inserted into the bottom groove 210a of the base plate 210.

[0131] FIG. 15 shows the pack case 200 in which the cell assembly 100 is housed in the housing portion A. The cell assembly 100 installed in the housing portion A is fixed to the pack case 200 by the auxiliary partition wall 240 and the coupling member B passing through the auxiliary partition wall 240.

[0132] In the battery pack of the present invention, even if any one of the housed cell assemblies 100 swells, the deformation of the cell assembly 100 can be primarily suppressed by the auxiliary partition wall 240 formed by the coupling of the two reinforcing plates 130. Further, the deformation of the cell assembly 100 can be secondarily suppressed through a plurality of coupling members B that vertically penetrate the auxiliary partition wall 240 and are coupled to the base plate 210.

[0133] (Second Embodiment) The cell assembly 100 included in the battery pack according to the second embodiment of the present invention is different from the cell assembly 100 of the battery pack according to the first embodiment in that the protruding portion 131 of the reinforcing plate 130 does not have a hollow structure.

[0134] Therefore, the auxiliary partition wall 240 included in the battery pack of the second embodiment has a feature of further improved strength.

[0135] FIG. 16 is a perspective view of a cell assembly 100 included in a battery pack according to the second embodiment, and FIG. 17 is a plan view of the cell assembly 100 of FIG. 16.

[0136] As shown in FIGS. 16 and 17, the cell assembly 100 includes a cell block 110 in which a plurality of cells are stacked, and end plates 120 respectively coupled to the front and rear of the cell block 110.

[0137] The cell assembly 100 includes a pair of reinforcing plates 130 coupled to both sides so as to support the side surfaces of the cell block 110.

[0138] The reinforcing plate 130 can be coupled to the end plate 120. At this time, the reinforcing plate 130 can be coupled to the side surface of the end plate 120 by separate screws or the like, or can be fixed to the end plate 120 by an adhesive.

[0139] The battery pack of the present invention is coupled such that the reinforcing plates 130 included on one side of a pair of cell assemblies 100 accommodated adjacent to the pack case 200 are coupled to each other to form one auxiliary partition wall 240.

[0140] The reinforcing plate 130 forms a step and includes a protruding portion 131 that protrudes.

[0141] As shown in FIG. 16, the protruding portion 131 protrudes so as to form a step along the height direction d2 of the cell assembly on one side of the reinforcing plate 130, and is formed to extend along the longitudinal direction d1 of the cell assembly.

[0142] According to FIG. 16, a plurality of coupling holes 131a can be formed along the longitudinal direction d1 of the cell assembly.

[0143] As shown in FIG. 17, the reinforcing plate 130 is composed of a first reinforcing plate 130a coupled to one side of the cell assembly 100 and a second reinforcing plate 130b coupled to the other side.

[0144] There is a difference in the position of the protrusion 131 between the first reinforcing plate 130a and the second reinforcing plate 130b.

[0145] In the first reinforcing plate 130a, the protrusion 131 is formed at the lower part of the reinforcing plate 130 and extends along the longitudinal direction d1 of the cell assembly.

[0146] The protrusion 131 protrudes to form a step on one side of the reinforcing plate 130. The first reinforcing plate 130a includes an upper step portion 133a formed by the upper corner of the protrusion 131 formed at the lower part. The upper step portion 133a extends along the protrusion 131 in the longitudinal direction d1 of the cell assembly.

[0147] In the protrusion 131 of the first reinforcing plate 130a, a plurality of coupling holes 131a are formed at predetermined intervals.

[0148] In the second reinforcing plate 130b, the protrusion 131 is formed at the upper part of the reinforcing plate 130 and extends along the longitudinal direction d1 of the cell assembly.

[0149] The second reinforcing plate 130b includes a lower step portion 133b formed by the lower corner of the protrusion 131 formed at the upper part. The lower step portion 133b extends along the protrusion 131 in the longitudinal direction d1 of the cell assembly.

[0150] When a pair of cell assemblies 100 are coupled by the reinforcing plate 130, the first reinforcing plate 130a included on one side of one of the cell assemblies 100 is coupled to the second reinforcing plate 130b included on one side of the other cell assembly 100.

[0151] The protruding portion 131 of the second reinforcing plate 130b has a plurality of coupling holes 131a formed at a predetermined interval, and is preferably formed at the same position as the coupling holes 131a formed in the protruding portion 131 of the first reinforcing plate 130a with respect to the longitudinal direction d1 of the cell assembly.

[0152] In each of the cell assemblies 100 to be coupled, a pair of reinforcing plates 130 formed on one side of each cell assembly 100 so as to face each other are coupled such that the protruding portions 131 mesh with each other. Specifically, the first reinforcing plate 130a of one of the cell assemblies 100 is coupled to the second reinforcing plate 130b of another adjacent cell assembly 100. At this time, the protruding portion 131 formed at the lower part of the first reinforcing plate 130a and the protruding portion 131 formed at the upper part of the second reinforcing plate 130b are positioned and coupled so as to mesh with each other to form one auxiliary partition wall 240.

[0153] FIG. 18 shows a pair of reinforcing plates 130 respectively arranged so as to face each other on the side surfaces of a pair of adjacent cell assemblies 100.

[0154] Referring to FIG. 18, the first reinforcing plate 130a and the second reinforcing plate 130b are formed to correspond to the shapes of the protruding portions 131 formed thereon respectively. Specifically, one side of the first reinforcing plate 130a facing the protruding portion 131 formed at the upper part of the second reinforcing plate 130b is formed to correspond to the shape of the protruding portion 131 of the second reinforcing plate 130b, and one side of the second reinforcing plate 130b facing the protruding portion 131 formed at the lower part of the first reinforcing plate 130a is formed to correspond to the shape of the protruding portion 131 of the first reinforcing plate 130a.

[0155] The first reinforcing plate 130a and the second reinforcing plate 130b can be coupled so that no gap is generated therebetween due to their corresponding shapes. At this time, the lower step portion 133b of the second reinforcing plate 130b contacts the upper step portion 133a of the first reinforcing plate 130a by this coupling.

[0156] Further, due to the above connection, each connection hole 131a included in the first reinforcing plate 130a coincides with each connection hole 131a included in the second reinforcing plate 130b.

[0157] FIG. 19 shows an auxiliary partition wall 240 in which the first reinforcing plate 130a and the second reinforcing plate 130b are connected.

[0158] As shown in FIG. 19, in the auxiliary partition wall 240 of the present invention, the first reinforcing plate 130a and the second reinforcing plate 130b are connected without a gap.

[0159] The positions of the respective connection holes 131a coincide with each other such that each connection hole 131a of the first reinforcing plate 130a communicates with each connection hole 131a of the second reinforcing plate 130b.

[0160] The auxiliary partition wall 240 included in the battery pack according to the second embodiment shown in FIG. 19 is coupled and fixed to the pack case 200 in the same manner as the auxiliary partition wall 240 included in the battery pack according to the first embodiment.

[0161] (Third Embodiment) The cell assembly 100 included in the battery pack according to the third embodiment of the present invention includes a horizontal insertion bar 134b protruding in the horizontal direction and a horizontal insertion hole 135b formed in the horizontal direction on the outer surface of the reinforcing plate 130.

[0162] FIG. 20 shows a pair of reinforcing plates 130 included in the battery pack according to the third embodiment.

[0163] As shown in FIG. 20, the horizontal insertion bar 134b and the horizontal insertion hole 135b are formed on the outer surfaces of the reinforcing plates 130 provided on both sides of the cell assembly 100, respectively.

[0164] The horizontal insertion bar 134b is formed at a position where the protrusion 131 is not formed in each reinforcing plate 130.

[0165] The above horizontal insertion bar 134b is formed at a predetermined interval from the protrusion 131 at one of the upper and lower positions of the protrusion 131.

[0166] Specifically, when the protrusion 131 of the reinforcing plate 130 is formed at the upper part, the horizontal insertion bar 134b is formed at the lower part of the protrusion 131. Also, when the protrusion 131 of the reinforcing plate 130 is formed at the lower part, the horizontal insertion bar 134b is formed at the upper part of the protrusion 131.

[0167] The above horizontal insertion hole 135b is formed at the position where the protrusion 131 is formed in each reinforcing plate 130. Specifically, each horizontal insertion hole 135b is formed at a position corresponding to the horizontal insertion bar 134b of the other reinforcing plate 130 facing it.

[0168] The cell assembly included in the battery pack according to the third embodiment includes only one of the horizontal insertion bar 134b and the horizontal insertion hole 135b in each reinforcing plate 130.

[0169] When the horizontal insertion bar 134b is formed on the first reinforcing plate 130a, correspondingly, the horizontal insertion hole 135b is formed on the second reinforcing plate 130b. Conversely, when the horizontal insertion bar 134b is formed on the second reinforcing plate 130b, correspondingly, the horizontal insertion hole 135b is formed on the first reinforcing plate 130a.

[0170] That is, in some embodiments, the cell assembly 100 of the present invention includes the horizontal insertion bar 134b on the upper part of the outer surface of the first reinforcing plate 130a and includes the horizontal insertion hole 135b on the upper part of the outer surface of the second reinforcing plate 130b.

[0171] In this case, the horizontal insertion hole 135b of the second reinforcing plate 130b is formed corresponding to the horizontal insertion bar 134b of the first reinforcing plate 130a so that the horizontal insertion bar 134b of the first reinforcing plate 130a can be inserted.

[0172] In another embodiment, the cell assembly 100 of the present invention includes a horizontal insertion hole at the lower part of the outer surface of the first reinforcing plate and a horizontal insertion bar at the lower part of the outer surface of the second reinforcing plate.

[0173] In this case, the horizontal insertion hole of the first reinforcing plate is formed corresponding to the horizontal insertion bar of the second reinforcing plate so that the horizontal insertion bar of the second reinforcing plate can be inserted.

[0174] The first reinforcing plate of any one cell assembly 110 included in the auxiliary partition wall 240 is coupled to the second reinforcing plate by inserting the horizontal insertion bar into the horizontal insertion hole included in the second reinforcing plate of another cell assembly.

[0175] Thereby, the pair of cell assemblies 100 can be primarily coupled and fixed by the horizontal insertion bar 134b and the horizontal insertion hole 135b.

[0176] The battery pack according to the third embodiment of the present invention can also be seated in the pack case at once in a state where each cell assembly 100 is preliminarily coupled by the coupling of the horizontal insertion bar 134b and the horizontal insertion hole 135b of the reinforcing plate 130.

[0177] Also, the horizontal insertion bar 134b inserted into the horizontal insertion hole 135b restricts the horizontal movement or swaying of each reinforcing plate 130. Therefore, the reinforcing plate 130 and each cell assembly 100 including the reinforcing plate 130 can secure a stable fixing force in the horizontal direction by the horizontal insertion bar 134b and the horizontal insertion hole 135b.

[0178] (Fourth Embodiment) The cell assembly 100 included in the battery pack according to the fourth embodiment of the present invention includes a horizontal insertion bar 134b protruding horizontally from the reinforcing plate 130 and a horizontal insertion hole 135b formed horizontally on the outer surface.

[0179] FIG. 21 shows a pair of reinforcing plates 130 included in the battery pack according to the fourth embodiment.

[0180] As shown in FIG. 21, the horizontal insertion bar 134b and the horizontal insertion hole 135b are formed on the outer surfaces of the reinforcing plates 130 provided on both sides of the cell assembly 100, respectively.

[0181] The pair of reinforcing plates 130 provided on both sides of the cell assembly 100 each include protruding portions 131 at the upper and lower portions.

[0182] The horizontal insertion bar 134b is formed at a position where the protruding portion 131 is not formed on each reinforcing plate 130. Specifically, when the protruding portion 131 of the reinforcing plate 130 is formed at the upper portion, the horizontal insertion bar 134b is formed at the lower portion of the protruding portion 131. Also, when the protruding portion 131 of the reinforcing plate 130 is formed at the lower portion, the horizontal insertion bar 134b is formed at the upper portion of the protruding portion 131.

[0183] The horizontal insertion hole 135b is formed at a position where the protruding portion 131 is formed on each reinforcing plate 130. Specifically, each horizontal insertion hole 135b is formed at a position corresponding to the horizontal insertion bar 134b of the other reinforcing plate 130 facing it.

[0184] The cell assembly included in the battery pack according to the fourth embodiment may include the horizontal insertion bar 134a and the horizontal insertion hole 135b in each reinforcing plate 130 at the same time.

[0185] Therefore, when a pair of adjacent cell assemblies 100 are coupled, the horizontal insertion bar 134b of each of the reinforcing plates 130 is inserted into the horizontal insertion hole 135b of the other reinforcing plate 130. Thereby, the pair of cell assemblies 100 can be primarily coupled and fixed by the horizontal insertion bar 134b and the horizontal insertion hole 135b.

[0186] That is, in some embodiments, the cell assembly 100 of the present invention includes a horizontal insertion bar 134b on the upper part of the outer surface of the first reinforcing plate 130a and a horizontal insertion hole 135b on the upper part of the outer surface of the second reinforcing plate 130b. Further, the first reinforcing plate further includes a horizontal insertion hole at the lower part of the outer surface, and the second reinforcing plate further includes a horizontal insertion bar at the lower part of the outer surface.

[0187] The battery pack according to the fourth embodiment of the present invention can also be once seated in the pack case in a state where each cell assembly 100 is pre-bonded by the connection of the horizontal insertion bar 134b and the horizontal insertion hole 135b of the reinforcing plate 130.

[0188] Also, the horizontal insertion bar 134b inserted into the horizontal insertion hole 135b restricts the horizontal movement or swaying of each reinforcing plate 130. Therefore, each cell assembly 100 including the reinforcing plate 130 and the reinforcing plate 130 can ensure a stable fixing force in the horizontal direction by the horizontal insertion bar 134b and the horizontal insertion hole 135b.

[0189] (Fifth Embodiment) The cell assembly 100 included in the battery pack according to the fifth embodiment of the present invention includes a vertical insertion bar 134a protruding in the vertical direction on the reinforcing plate 130 and a vertical insertion hole 135a formed in the vertical direction.

[0190] FIG. 22 shows a pair of reinforcing plates 130 included in the battery pack according to the fifth embodiment.

[0191] As shown in FIG. 22, the vertical insertion bar 134a and the vertical insertion hole 135a are formed in the reinforcing plates 130 provided on both sides of the cell assembly 100, respectively.

[0192] Of the pair of reinforcing plates 130 provided on both sides of the cell assembly 100, one includes the vertical insertion bar 134a and the other includes the vertical insertion hole 135a.

[0193] The vertical insertion bar 134a and the vertical insertion hole 135a are formed in either the upper part or the lower part of the protrusion 131. Specifically, in the case of the reinforcing plate 130 in which the protrusion 131 is formed in the upper part among the pair of reinforcing plates 130, the vertical insertion bar 134a is formed so as to extend downward at the lower part of the protrusion 131, that is, at the lower step portion 133b.

[0194] Also, in the case of the other reinforcing plate 130 in which the protrusion 131 is formed in the lower part, the vertical insertion hole 135a is formed at the upper part of the protrusion 131, that is, at the upper step portion 133a at a position corresponding to the vertical insertion bar 134a of the other cell assembly 100.

[0195] That is, in some embodiments, the cell assembly 100 of the present invention includes a vertical insertion bar at the upper step portion of the first reinforcing plate and a vertical insertion hole at the lower step portion of the second reinforcing plate.

[0196] In this case, the vertical insertion hole of the second reinforcing plate is formed corresponding to the vertical insertion bar of the first reinforcing plate so that the vertical insertion bar of the first reinforcing plate can be inserted.

[0197] In other embodiments, the cell assembly 100 of the present invention includes a vertical insertion hole at the upper step portion of the first reinforcing plate and a vertical insertion bar at the lower step portion of the second reinforcing plate.

[0198] In this case, the vertical insertion hole of the first reinforcing plate is formed corresponding to the vertical insertion bar of the second reinforcing plate so that the vertical insertion bar of the second reinforcing plate can be inserted.

[0199] The first reinforcing plate of any one cell assembly 100 included in the auxiliary partition wall 240 is coupled to the second reinforcing plate by inserting the vertical insertion bar into the vertical insertion hole included in the second reinforcing plate of the other cell assembly 100.

[0200] Accordingly, a pair of cell assemblies can be primarily coupled and fixed by the vertical insertion bars and the vertical insertion holes.

[0201] However, different from the battery packs according to the third and fourth embodiments, in the battery pack according to the fifth embodiment, a pair of cell assemblies 100 are coupled by moving in the vertical direction.

[0202] The battery pack according to the fifth embodiment of the present invention can also be seated in the pack case at once in a state where each cell assembly 100 is pre-coupled by the coupling of the vertical insertion bars and the vertical insertion holes of the reinforcing plate 130.

[0203] The vertical insertion bar 134a inserted into the vertical insertion hole 135a restricts the vertical movement or swaying of each reinforcing plate 130. Accordingly, the reinforcing plate 130 and each cell assembly 100 including the reinforcing plate 130 can secure a stable fixing force in the vertical direction by the vertical insertion bar 134a and the vertical insertion hole 135a.

[0204] (Sixth Embodiment) The cell assembly 100 included in the battery pack according to the sixth embodiment of the present invention includes a vertical insertion bar 134a protruding vertically from the reinforcing plate 130 and a vertical insertion hole 135a formed in the vertical direction. In particular, it is characterized in that both the vertical insertion bar 134a and the vertical insertion hole 135a are formed in any one of the reinforcing plates 130.

[0205] FIG. 23 shows a pair of reinforcing plates 130 included in the battery pack according to the sixth embodiment.

[0206] As shown in FIG. 23, the vertical insertion bar 134a and the vertical insertion hole 135a are formed on the outer surfaces of the reinforcing plates 130 provided on both sides of the cell assembly 100, respectively.

[0207] Each reinforcing plate 130 provided on both sides of the cell assembly 100 includes both a vertical insertion bar 134a and a vertical insertion hole 135a.

[0208] In the case of the reinforcing plate 130 in which the protrusion 131 is formed at the upper part among the pair of reinforcing plates 130, the vertical insertion bar 134a and the vertical insertion hole 135a are formed at the lower part of the protrusion 131, that is, at the lower step portion 133b. Conversely, in the case of the reinforcing plate 130 in which the protrusion 131 is formed at the lower part, the vertical insertion bar 134a and the vertical insertion hole 135a are formed at the upper part of the protrusion 131, that is, at the upper step portion 133a.

[0209] At this time, each vertical insertion bar 134a and vertical insertion hole 135a formed in any one of the reinforcing plates 130 corresponds to the positions of the vertical insertion holes 135a and vertical insertion bars 134a formed in the other reinforcing plate 130 to be joined.

[0210] Specifically, as shown in FIG. 23, the vertical insertion bar 134a and the vertical insertion hole 135a formed downward in the reinforcing plate 130 including the protrusion 131 at the upper part correspond to the vertical insertion hole 135a and the vertical insertion bar 134a formed upward in the reinforcing plate 130 including the protrusion 131 at the lower part.

[0211] Therefore, the vertical insertion bar 134a of each reinforcing plate 130 is inserted into the corresponding vertical insertion hole 135a, and the pair of reinforcing plates 130 are joined.

[0212] That is, in some embodiments, the cell assembly 100 of the present invention includes a vertical insertion bar at the upper step portion of the first reinforcing plate and a vertical insertion hole at the lower step portion of the second reinforcing plate. Further, the first reinforcing plate further includes a vertical insertion hole at the upper step portion, and the second reinforcing plate further includes a vertical insertion bar at the lower step portion.

[0213] Similar to the battery pack according to the fifth embodiment, in the battery pack according to the sixth embodiment, a pair of cell assemblies 100 move in the vertical direction to be joined.

[0214] The vertical insertion bar 134a inserted into the vertical insertion hole 135a restricts each reinforcing plate 130 from moving vertically or swaying. Therefore, each reinforcing plate 130 and each cell assembly 100 including the reinforcing plate 130 can secure a stable fixing force in the vertical direction by the vertical insertion bar 134a and the vertical insertion hole 135a.

[0215] As described above, the present invention has been described in more detail through the drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention. Therefore, there may be various equivalents and modifications that can replace these at the time of this application.

Explanation of Reference Numerals

[0216] 10: (Prior Art) Cell Assembly 11: (Prior Art) Cell Block 12: (Prior Art) End Plate 100: Cell Assembly 110: Cell Block 120: End Plate 130: Reinforcing Plate 130a: First Reinforcing Plate 130b: Second Reinforcing Plate 131: Protrusion 131a: Coupling Hole 132: Coupling Portion 132a: Auxiliary Coupling Hole 133: Step Portion 133a: Upper Step Portion 133b: Lower Step Portion 134a: Vertical Insertion Bar 134b: Horizontal Insertion Bar 135a: Vertical Insertion Hole 135b: Horizontal Insertion Hole 200: Pack Case 210: Base Plate 210a: Bottom Groove 220: Main Partition 220a: Coupling groove 230: Side wall 230a: Screw hole 240: Auxiliary partition wall 240a: Screw groove A: Accommodation part B: Coupling member d1: Longitudinal direction of the cell assembly d2: Height direction of the cell assembly d3: Longitudinal direction of the main partition wall

Claims

1. a cell block including a plurality of cells, and a pair of reinforcing plates coupled to both side surfaces of the cell block so as to support both side surfaces of the cell block and including protrusions on outer surfaces wherein the reinforcing plates include a first reinforcing plate coupled to one side of the cell block, and a second reinforcing plate coupled to the other side of the cell block wherein outer surfaces of the first reinforcing plate and the second reinforcing plate have a shape that meshes with each other, a cell assembly.

2. the first reinforcing plate includes the protrusion at a lower portion of an outer surface and includes an upper stepped portion at an upper portion of the protrusion, the second reinforcing plate includes the protrusion at an upper portion of an outer surface and includes a lower stepped portion at a lower portion of the protrusion, the cell assembly according to claim 1.

3. the first reinforcing plate includes a horizontal insertion bar at an upper portion of the outer surface, the second reinforcing plate includes a horizontal insertion hole at an upper portion of the outer surface, the horizontal insertion hole of the second reinforcing plate is formed corresponding to the horizontal insertion bar of the first reinforcing plate so that the horizontal insertion bar of the first reinforcing plate can be inserted therein, the cell assembly according to claim 2.

4. the first reinforcing plate further includes a horizontal insertion hole at a lower portion of the outer surface, the second reinforcing plate further includes a horizontal insertion bar at a lower portion of the outer surface, the horizontal insertion hole of the first reinforcing plate is formed corresponding to the horizontal insertion bar of the second reinforcing plate so that the horizontal insertion bar of the second reinforcing plate can be inserted therein, the cell assembly according to claim 3.

5. the first reinforcing plate includes a horizontal insertion hole at a lower portion of the outer surface, the second reinforcing plate includes a horizontal insertion bar at a lower portion of the outer surface, the horizontal insertion hole of the first reinforcing plate is formed corresponding to the horizontal insertion bar of the second reinforcing plate so that the horizontal insertion bar of the second reinforcing plate can be inserted therein, the cell assembly according to claim 2.

6. the first reinforcing plate includes a vertical insertion bar at the upper stepped portion, the second reinforcing plate includes a vertical insertion hole at the lower stepped portion, the vertical insertion hole of the second reinforcing plate is formed corresponding to the vertical insertion bar of the first reinforcing plate so that the vertical insertion bar of the first reinforcing plate can be inserted therein, the cell assembly according to claim 2.

7. the first reinforcing plate further includes a vertical insertion hole at the upper stepped portion, the second reinforcing plate further includes a vertical insertion bar at the lower stepped portion, The vertical insertion hole of the first reinforcing plate is formed corresponding to the vertical insertion bar of the second reinforcing plate so that the vertical insertion bar of the second reinforcing plate can be inserted, according to claim 6, the cell assembly.

8. The first reinforcing plate includes a vertical insertion hole in the upper stepped portion, The second reinforcing plate includes a vertical insertion bar in the lower stepped portion, The vertical insertion hole of the first reinforcing plate is formed corresponding to the vertical insertion bar of the second reinforcing plate so that the vertical insertion bar of the second reinforcing plate can be inserted, according to claim 2, the cell assembly.

9. The protruding portion is formed to extend along the longitudinal direction of the cell assembly, according to claim 1, the cell assembly.

10. The protruding portion has a hollow structure, according to claim 1, the cell assembly.

11. The cell assembly according to any one of claims 1 to 10, and A pack case including a housing portion in which the cell assembly is housed including, Any pair of cell assemblies housed adjacent to the housing portion are joined such that the first reinforcing plate and the second reinforcing plate are joined to form one auxiliary partition wall, a battery pack.

12. The auxiliary partition wall is joined to the pack case by a coupling member that penetrates the auxiliary partition wall and is joined to the bottom of the pack case, according to claim 11, the battery pack.

13. The protruding portion includes a coupling hole perforated so that a coupling member can penetrate, The coupling holes respectively included in the first reinforcing plate and the second reinforcing plate included in the auxiliary partition wall are provided at corresponding positions to each other, according to claim 12, the battery pack.

14. The pack case includes a base plate that supports the lower portion of the cell assembly, The base plate corresponds to the position of the coupling hole included in the auxiliary partition wall and includes a bottom groove formed so that the coupling member can be inserted, The auxiliary partition wall penetrates the coupling hole and is joined to the base plate by the coupling member inserted into the bottom groove, according to claim 13, the battery pack.

15. The first reinforcing plate includes the protruding portion at the lower part of the outer surface, and includes an upper stepped portion formed by the protruding portion at the upper part of the protruding portion, The second reinforcing plate includes the protruding portion at the upper part of the outer surface, and includes a lower stepped portion formed by the protruding portion at the lower part of the protruding portion, according to claim 11, the battery pack.

16. The first reinforcing plate includes a horizontal insertion bar at the upper part of the outer surface, The second reinforcing plate includes a horizontal insertion hole at the upper part of the outer surface, The battery pack according to claim 15, wherein the first reinforcing plate of any one cell assembly included in the auxiliary partition wall is coupled to the second reinforcing plate by inserting the horizontal insertion bar into the horizontal insertion hole included in the second reinforcing plate of another cell assembly.

17. The first reinforcing plate includes a vertical insertion bar at the upper stepped portion, The second reinforcing plate includes a vertical insertion hole at the lower stepped portion, The battery pack according to claim 15, wherein the first reinforcing plate of any one cell assembly included in the auxiliary partition wall is coupled to the second reinforcing plate by inserting the vertical insertion bar into the vertical insertion hole included in the second reinforcing plate of another cell assembly.

Images