CELL STACK ASSEMBLY AND BATTERY PACK INCLUDING SAME - Patent application

Abstract

The present invention relates to a cell stack assembly including a cell stack in which a plurality of battery cells are stacked, bus bar frames including bus bars electrically connected to the battery cells and closely coupled to front and rear ends of the cell stack, end plates coupled to the bus bar frames to cover the bus bars, and support blocks coupled to both side surfaces of the end plates to cover one side of a battery cell located at the outermost edge of the cell stack, and a battery pack including the cell stack assembly.

Description

[Technical field]

[0001] The present invention relates to a cell stack assembly including a plurality of stacked battery cells and a battery pack including the cell stack assembly. More specifically, the present invention is characterized in that a partition wall for partitioning the cell stack assembly is removed from the battery pack and a support block structure capable of replacing the partition wall is used to enhance utilization of the internal space of the battery pack.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0053655 dated April 29, 2022, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference. [Background technology]

[0003] Currently, types of secondary batteries that are widely used include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, and nickel zinc batteries. The operating voltage of such a unit secondary battery cell, i.e., a unit battery cell, is about 2.5V to 4.5V. Therefore, when a higher output voltage is required, a battery pack may be configured by connecting a plurality of battery cells in series. Also, a battery pack may be configured by connecting a number of battery cells in parallel according to the charge / discharge capacity required for the battery pack. Therefore, the number of battery cells included in the battery pack may be variously set according to the required output voltage or charge / discharge capacity.

[0004] Meanwhile, when constructing a battery pack by connecting a plurality of battery cells in series / parallel, a common method is to first construct a battery module including at least one battery cell, and then use this at least one battery module to add other components to construct the battery pack.

[0005] A conventional battery module generally includes at least one cell stack including battery cells, and a box-shaped metal housing structure, i.e., a module frame, that houses the at least one cell stack. This conventional battery module structure has problems in that the weight and volume of the module frame itself reduce the energy density of the entire battery pack, and increase the weight of the entire battery pack.

[0006] Due to the above-mentioned problems, a conventional method was attempted in which the module frame configuration that encases and protects the cell stack was eliminated, and instead, a method was attempted in which a bus bar frame and end plates were attached to the front and rear faces, respectively, of the cell stack on which the electrode leads are formed, to store and arrange the cell stack in a battery pack.

[0007] Fig. 1 is a perspective view of a cell stack assembly including a cell stack, a bus bar frame, and an end plate, excluding the module frame. However, the cell stack assembly having the structure shown in Fig. 1 has problems in that it is difficult to handle and not easy to fix inside a battery pack.

[0008] Therefore, there is a need to find a way to provide a cell stack assembly that is lightweight, thereby reducing the overall weight and thereby increasing the energy density, and that is easy to fix and handle, and a battery pack including the cell stack assembly. Summary of the Invention [Problem to be solved by the invention]

[0009] Therefore, an object of the present invention is to increase the space utilization rate inside a battery pack by eliminating the conventional module frame.

[0010] Another object of the present invention is to provide a structure that can support a cell stack in which a plurality of battery cells are stacked without a module frame, and can couple and fix the cell stack to a battery pack.

[0011] Another object of the present invention is to provide a structure capable of connecting and fixing a plurality of cell stacks together.

[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. Also, it will be easily understood that the objects and advantages of the present invention can be realized by the means and combinations thereof as set forth in the claims. [Means for solving the problem]

[0013] According to the present invention, there is provided a cell stack assembly including: a cell stack in which a plurality of battery cells are stacked; bus bar frames including bus bars electrically connected to the battery cells and tightly coupled to front and rear ends of the cell stack, respectively; end plates coupled to the bus bar frames to cover the bus bars; and support blocks coupled to both side surfaces of the end plates, respectively, to cover one side of a battery cell located at an outermost portion of the cell stack, the support blocks including fastening grooves at their upper and lower portions.

[0014] The fastening grooves may be formed in a plurality of locations spaced apart from each other at predetermined intervals along a longitudinal direction of the support block.

[0015] The support blocks on both sides of the cell stack may include fastening grooves at positions facing each other.

[0016] The cell stack may further include a cover coupled to the support block to cover at least one of the open upper and lower portions of the cell stack, and the cover may include a through hole corresponding to the fastening groove of the support block in an area where the cover is in contact with and coupled to the support block.

[0017] The support block and the cover may be screwed together by a bolt that passes through the through hole and is inserted into the fastening groove.

[0018] According to the present invention, there is provided a battery pack including the cell stack assembly and a pack case in which a plurality of the cell stack assemblies are arranged, wherein the cell stack assembly is arranged such that at least one side of a support block of the cell stack assembly is in contact with one side of the support block of an adjacent cell stack assembly.

[0019] The pack case includes a bottom hole formed through the bottom corresponding to the position of a fastening groove formed at the bottom of the cell stack assembly, and the cell stack assembly can be coupled to the pack case by bolts inserted into the fastening groove and bottom hole.

[0020] The pack case further includes a fixing member that is coupled to a support block of each of the cell stack assemblies so as to fix the at least two cell stack assemblies arranged in the pack case, the fixing member including fixing holes formed therethrough at positions corresponding to the fastening grooves of each of the support blocks, and the fixing member can be screwed to the support block by bolts inserted into the fixing holes and the fastening grooves corresponding to the fixing holes.

[0021] The fixing member may be coupled at both ends to two adjacent support blocks to fix the pair of cell stack assemblies.

[0022] The fixing member may be formed to extend along a longitudinal direction of two adjacent support blocks, and the fixing holes may be formed spaced apart along the longitudinal direction of the fixing member to correspond to the fastening grooves of each support block.

[0023] The fixing member may be extended in a width direction of the support block to fix a plurality of cell stack assemblies, and may be coupled to at least four support blocks.

[0024] The fixing member may extend across a cell stack included in the cell stack assembly and support an upper portion of the cell stack.

[0025] The pack case includes a lower plate supporting a lower portion of the cell stack assembly to be placed, and a side wall formed along the edge of the lower plate to enclose a side of the cell stack assembly, and an inner surface of the side wall includes a mounting portion formed to protrude toward the cell stack assembly, and a support block of the cell stack assembly includes a protrusion protruding toward at least one of a front surface and a rear surface of the cell stack assembly, and the cell stack assembly can be placed in the pack case such that the protrusion is mounted on the mounting portion of the side wall.

[0026] The mounting portion includes a mounting groove at an upper portion, and the protrusion portion includes a protrusion hole formed through an upper portion and a lower portion, and the cell stack assembly can be screwed to the side wall by bolts inserted into the protrusion hole and the mounting groove. Effect of the Invention

[0027] According to the present invention, the energy density of the battery pack can be increased by improving the space utilization rate inside the battery pack. [Brief description of the drawings]

[0028] [Figure 1] 1 shows a conventional cell stack assembly. [Diagram 2] FIG. 2 is an exploded perspective view of the cell stack assembly of the present invention. [Diagram 3] FIG. 2 is a perspective view of a cell stack assembly of the present invention. [Figure 4] FIG. 2 is a perspective view of a cover and a cell stack assembly of the present invention. [Diagram 5] FIG. 2 is a perspective view of a cell stack assembly of the present invention with a cover coupled thereto. [Figure 6] FIG. 6 is a cross-sectional view of the cell stack assembly of FIG. 5. [Figure 7] FIG. 1 is a perspective view of a battery pack according to the present invention. [Figure 8] FIG. 2 is a perspective view of a pair of cell stack assemblies of the present invention positioned adjacent to one another. [Figure 9] FIG. 2 is a rear perspective view of the pack case of the present invention. [Figure 10] 13 is a modified example of the support block of the present invention. [Figure 11] 11 shows a part of a cell stack assembly and a pack case to which the support block of FIG. 10 is applied. [Figure 12] FIG. 12 is a plan view of a battery pack including a cell stack assembly to which the support block of FIG. 11(a) is applied, and a pack case in which the cell stack assembly is disposed. [Figure 13] 1 illustrates a fixing member and a cell stack assembly included in a battery pack according to a first embodiment of the present invention. [Figure 14] FIG. 14 is a perspective view of a pair of cell stack assemblies to which the fixing member of FIG. 13 is applied. [Figure 15] 14 is a plan view of a battery pack including a cell stack assembly to which the fixing member of FIG. 13 is applied, and a pack case in which the cell stack assembly is disposed. FIG. [Figure 16] 13 illustrates a fixing member and a cell stack assembly included in a battery pack according to a second embodiment of the present invention. [Figure 17] 13 illustrates a fixing member and a cell stack assembly included in a battery pack according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Before that, the terms and words used in the specification and claims should not be interpreted limitedly to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concept of the term to best describe his own invention.

[0030] Therefore, it should be understood that the embodiment described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiment of the present invention and do not represent the entire technical idea of ​​the present invention, and that there may be various equivalents and modifications that can replace them at the time of this application.

[0031] In addition, in the description of the present invention, if it is determined that a detailed description of related known structures or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0032] Since the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or illustrated roughly for clearer explanation. Therefore, the sizes and ratios of each component do not completely reflect the actual sizes and ratios.

[0033] The present invention relates to a cell stack assembly and a battery pack including the cell stack assembly. Hereinafter, the cell stack assembly of the present invention will be described with reference to Figures 2 to 6, and the battery pack of the present invention will be described with reference to Figures 7 to 17.

[0034] <Cell stack assembly 100> FIG. 2 is an exploded perspective view of the cell stack assembly 100 of the present invention, and FIG. 3 is a perspective view of the cell stack assembly 100 of the present invention.

[0035] According to above FIGS. 2 and 3, the cell stack assembly 100 of the present invention includes a cell stack 110, a bus bar frame 120, an end plate 130, and a support block 140.

[0036] The cell stack 110 includes a plurality of stacked battery cells 111. The battery cell 111 includes an electrode assembly therein, a pair of electrode leads electrically connected to the electrode assembly, and a battery case that encases the electrode assembly such that the electrode leads are led out to the outside. In this case, the electrode leads may be led out to both sides of the battery case.

[0037] The bus bar frame 120 includes a bus bar 121 (not shown) electrically connected to the battery cell 111 .

[0038] The bus bar frame 120 is closely coupled to the cell stack 110 at the front and rear of the cell stack 110 such that electrode leads of each battery cell 111 included in the cell stack 110 are connected to the bus bar 121 .

[0039] The end plate 130 is coupled to the bus bar frame 120 to cover 150 the bus bar 121 in order to protect the bus bar 121 and the electrode leads from external impact.

[0040] In addition, the end plate 130 fixes the battery cells 111 included in the cell stack 110 together.

[0041] The support blocks 140 are coupled to both sides of the end plate 130 as shown in FIG. 3 so as to cover 150 one side of the battery cell 111 located at the outermost edge of the cell stack 110 .

[0042] The support block 140 may be made of the same material as the partition walls conventionally installed to divide the inside of the battery pack 1000 and separate each battery module, and preferably includes a flame-retardant and heat-resistant material.

[0043] The support block 140 may be screwed to the end plate 130, or may be connected to the end plate 130 by methods such as adhesive and heat fusion.

[0044] The support block 140 is coupled to the end plate 130 and comes into close contact with the battery cells 111 located at the outermost edge of the cell stack 110 to protect the cell stack 110 .

[0045] The support block 140, as shown in FIG. 2, is characterized in that it includes fastening grooves 141 at its upper and lower parts into which a bolt B can be inserted.

[0046] The fastening grooves 141 are formed in a plurality at predetermined intervals along the longitudinal direction of the support block 140 .

[0047] The fastening grooves 141 formed in each of the support blocks 140 are preferably formed at positions facing each other with the cell stack 110 at the center.

[0048] The fastening groove 141 includes an upper fastening groove 141 a formed in the upper part of the support block 140 and a lower fastening groove 141 b formed in the lower part of the support block 140 .

[0049] The upper fastening groove 141a and the lower fastening groove 141b formed on the upper and lower parts of the support block 140, respectively, may be separated from each other or may be connected to each other by penetrating the support block 140 in the thickness direction.

[0050] FIG. 4 shows a cell stack assembly 100 of the present invention and a cover 150 that can be coupled to the cell stack assembly 100. As shown in FIG.

[0051] As shown in FIG. 4, the cell stack assembly 100 of the present invention further includes a cover 150 that is coupled to the support block 140 so as to cover at least one of the open upper and lower portions of the cell stack 110.

[0052] The cover 150 includes through holes corresponding to the fastening grooves 141 of the support block 140 in an area where the cover 150 is in contact with and coupled to the support block 140. That is, the cover 150 includes through holes on both side edges through which the bolts B pass.

[0053] The cover 150 includes an upper cover 151 coupled to the support block 140 at the upper portion of the cell stack assembly 100 , and a lower cover 152 coupled to the support block 140 at the lower portion of the cell stack assembly 100 .

[0054] FIG. 5 is a perspective view of the cell stack assembly 100 in which the upper cover 151 and the lower cover 152 are joined to the support block 140. As shown in FIG.

[0055] As shown in FIG. 5, the upper cover 151 is coupled to an upper surface of the support block 140 , and the lower cover 152 is coupled to a lower surface of the support block 140 .

[0056] The upper cover 151 and the lower cover 152 may be screwed to the support block 140 by bolts B inserted into through holes and fastening grooves 141 formed in the upper and lower parts of the support block 140, respectively.

[0057] The cover 150 may be used temporarily to protect the cell stack 110 that is open to the outside in the cell stack assembly 100, and may be detached from the cell stack assembly 100 at any time as necessary.

[0058] FIG. 6 shows a cross section of the cell stack assembly 100 of FIG.

[0059] 6, the lower cover 152 may be coupled to the support block 140 at the lower portion of the cell stack 110 to support the lower portion of the cell stack 110 so as not to sag. In addition, the cell stack 110 may be sealed and protected from the outside by the support block 140 surrounding both sides, the end plates 130 surrounding the front and rear sides, and the covers 150 covering the top and bottom.

[0060] <Battery Pack 1000> The battery pack 1000 of the present invention includes the cell stack assembly 100 of the present invention, and a pack case 200 in which the cell stack assembly 100 is disposed. The battery pack 1000 of the present invention may further include a cover 150 (not shown) of the pack case 200 coupled to the pack case 200 so as to cover the upper part of the cell stack assembly 100 at an upper part of the pack case 200, if necessary.

[0061] FIG. 7 shows a battery pack 1000 of the present invention, in which a plurality of cell stack assemblies 100 are arranged in a pack case 200.

[0062] Specifically, the pack case 200 includes a lower plate 210 that supports the lower part of the cell stack assembly 100 to be arranged, and a side wall 220 formed along the edge of the lower plate 210 to wrap around the side of the cell stack assembly 100.

[0063] The cell stack assembly 100 is disposed in the pack case 200 such that at least one side of the support block 140 of the adjacent cell stack assembly 100 is in contact with one side of the support block 140 of the adjacent cell stack assembly 100 .

[0064] The pack case 200 may include a center partition 230 that crosses the center, and the cell stack assemblies 100 may be disposed symmetrically about the center partition 230 as shown in FIG.

[0065] FIG. 8 is a perspective view and a partial cross-sectional view of a pair of cell stack assemblies 100 arranged adjacent to each other within a pack case 200.

[0066] 8, it is preferable that the fastening grooves 141 are formed at corresponding positions in the support blocks 140 of adjacent cell stack assemblies 100. That is, the fastening grooves 141 included in the different support blocks 140 are formed at the same positions along the longitudinal direction of the support blocks 140.

[0067] It is preferable that the cell stack assembly 100 disposed in the pack case 200 is coupled and fixed to the pack case 200 .

[0068] FIG. 9 is a rear perspective view of the battery pack 1000 of the present invention.

[0069] The pack case 200 of the present invention may include a bottom hole 211 formed by penetrating the bottom corresponding to the position of the fastening groove 141 formed in the lower part of the cell stack assembly 100. Specifically, the bottom hole 211 is formed by penetrating the lower plate 210 of the pack case 200 at a position corresponding to the lower fastening groove 141b formed in the lower part of the support block 140 included in the cell stack assembly 100 disposed in the pack case 200.

[0070] Each cell stack assembly 100 arranged in the pack case 200 can be fixed to the pack case 200 by screwing it with a bolt B that passes through a bottom hole 211 of the pack case 200 and is inserted into a fastening groove 141 formed in the support block 140, as shown in FIG. 9.

[0071] Although not shown, for convenience, the bolt B may be inserted through the upper fastening groove 141a and the lower fastening groove 141b of the support block 140 and into the bottom hole 211 of the lower plate 210 to fix the cell stack assembly 100 and the pack case 200.

[0072] According to a modified example of the support block 140 of the present invention, the support block 140 may include a protrusion 142 protruding toward at least one of the front and rear surfaces of the cell stack assembly 100. In addition, an inner surface of a side wall 220 included in the pack case 200 may include a seating portion 221 protruding toward the cell stack assembly 100.

[0073] FIG. 10 shows a modified example of the support block 140, and more specifically, is a partial cross-sectional view of a pack case 200 including a seating portion 221 and a cell stack assembly 100 disposed in the pack case 200.

[0074] Referring to FIG. 10, the cell stack assembly 100 is disposed in the pack case 200 such that the protrusion 142 is seated on the seat 221 of the side wall 220 .

[0075] FIG. 11 shows a cell stack assembly 100 having a protrusion 142 formed on one or both sides of a support block 140 and a portion of a pack case 200, and FIG. 12 is a plan view of a battery pack 1000 in which the cell stack assembly 100 of FIG. 11(a) is disposed within a pack case 200.

[0076] 11, the cell stack assembly 100 is formed so that the protrusion 142 protrudes from one side of the support block 140 so as to face the side wall 220 of the pack case 200 (FIG. 11(a)), or the protrusion 142 protrudes from both sides of the support block 140 (FIG. 11(b)).

[0077] Referring to FIG. 12, each cell stack assembly 100 is disposed in the pack case 200 such that the protrusion 142 faces the side wall 220.

[0078] The cell stack assembly 100 may be fixed to the pack case 200 by screwing the protrusion 142 of the support block 140 into the seating portion 221 of the side wall 220. Specifically, as shown in the figure, the seating portion 221 includes a seating groove 221a in an upper portion into which a bolt B can be inserted, and the protrusion 142 includes a protrusion hole 142a into which the bolt B can be inserted and coupled.

[0079] The cell stack assembly 100 may be screwed and fixed to the side wall 220 by the bolt B inserted into the protruding hole 142a and the seating groove 221a.

[0080] The battery pack 1000 further includes a fixing member 300 coupled to the support block 140 of the cell stack assembly 100 so as to fix at least two cell stack assemblies 100 arranged in the pack case 200. More specifically, the fixing member 300 includes fixing holes 300a formed through the support block 140 at positions corresponding to the fastening grooves 141. The fixing member 300 is screw-coupled to the support block 140 by a bolt B inserted into the fixing hole 300a and the fastening groove 141 corresponding to the fixing hole 300a.

[0081] By the above-mentioned bonding, the cell stack assemblies 100 are fixed and connected to each other.

[0082] The battery pack 1000 of the present invention can be divided into several embodiments depending on the form of the fixing member 300.

[0083] Hereinafter, the battery pack 1000 of the present invention will be described for each embodiment with reference to FIGS.

[0084] (First embodiment) The fixing member 300 included in the battery pack 1000 of the present invention according to the first embodiment is characterized in that both ends are coupled to two adjacent support blocks 140.

[0085] FIG. 13 shows the configuration of a pair of adjacent cell stack assemblies 100 and a fixing member 300 of a battery pack 1000 according to the first embodiment, FIG. 14 is an oblique view of a pair of cell stack assemblies 100 joined together by the fixing member 300 of FIG. 13, and FIG. 15 is a plan view of a battery pack 1000 in which each cell stack assembly 100 is connected by the fixing member 300 of FIG. 13 and placed in a pack case 200.

[0086] The fixing member 300 included in the battery pack 1000 of the present invention according to the first embodiment includes a pair of fixing holes 300a through which the bolts B are drilled.

[0087] As shown in FIG. 14, the fixing member 300 is positioned on the support block 140 such that each fixing hole 300a corresponds to each fastening groove 141 formed in two adjacent support blocks 140, and is screwed and fixed to each support block 140 by a bolt B inserted into the fixing hole 300a and the fastening groove 141.

[0088] A pair of adjacent cell stack assemblies 100 are joined to each other by screwing the fixing members 300 to the respective support blocks 140 .

[0089] Second embodiment The fixing member 300 included in the battery pack 1000 of the present invention according to the second embodiment is characterized in that it is extended along the longitudinal direction of the support block 140 and has both ends coupled to two adjacent support blocks 140.

[0090] FIG. 16 shows the configuration of a pair of adjacently arranged cell stack assemblies 100 and a fixing member 300 of a battery pack 1000 according to the second embodiment.

[0091] The fixing member 300 included in the battery pack 1000 according to the second embodiment of the present invention includes a plurality of fixing holes 300a through which the bolts B pass.

[0092] 16, the fixing member 300 is extended along the longitudinal direction of the support block 140 and includes a plurality of fixing holes 300a formed along the extended direction to correspond to the fastening grooves 141 of each support block 140. That is, the fixing holes 300a are formed at predetermined intervals along the longitudinal direction of the fixing member 300 to correspond to the fastening grooves 141 of each support block 140.

[0093] The fixing member 300 firmly fixes the pair of cell stack assemblies 100 together by a plurality of bolts B inserted into fixing holes 300 a formed to correspond to the fastening grooves 141 .

[0094] Third embodiment The fixing member 300 included in the battery pack 1000 of the present invention according to the third embodiment is characterized in that it is extended in a direction crossing the cell stack 110 included in the cell stack assembly 100 and is coupled to a plurality of support blocks 140. More specifically, the extended fixing member 300 may be coupled to at least four support blocks 140.

[0095] FIG. 17 shows the configuration of a pair of adjacently arranged cell stack assemblies 100 and a fixing member 300 of a battery pack 1000 according to the third embodiment.

[0096] The fixing member 300 included in the battery pack 1000 according to the third embodiment of the present invention includes a plurality of fixing holes 300a through which the bolts B pass.

[0097] 17, the fixing member 300 is extended in a direction crossing the cell stack 110 and the support block 140, and includes a plurality of fixing holes 300a formed in the extended direction to correspond to the fastening grooves 141 of each support block 140. That is, the fixing holes 300a are formed at predetermined intervals along the longitudinal direction of the fixing member 300 to correspond to the fastening grooves 141 of each support block 140.

[0098] The fixing member 300 may fix a plurality of cell stack assemblies 100 by a plurality of bolts B inserted into fixing holes 300a formed to correspond to the fastening grooves 141, and may also support the upper portion of the cell stack 110 housed in the fixed cell stack assembly 100.

[0099] The fixing members 300 included in the battery packs 1000 according to the above three embodiments can be mixed and used within one battery pack 1000 as necessary.

[0100] The present invention has been described in more detail above with reference to the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments, etc. in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, so it should be understood that there may be various equivalents and modifications that can replace them at the time of filing this application. [Explanation of symbols]

[0101] 100 Cell stack assembly 110 Cell Stack 111 Battery Cell 120 Busbar Frame 121 Busbar 130 End Plate 140 Support Block 141 Fastening groove 141a Upper fastening groove 141b Lower fastening groove 142 Protrusion 142a Protruding hole 150 Cover 151 Top cover 152 Lower cover 200 pack case 210 Lower plate 211 Bottom Hole 220 Side wall 221 Safe Place 221a Seat groove 230 Center bulkhead 300 Fixing member 300a fixed hole 1000 Battery Pack B Bolt

Claims

1. A cell stack in which a plurality of battery cells are stacked; a bus bar frame including a bus bar electrically connected to the battery cell, the bus bar frame being closely coupled to a front and rear of the cell stack, respectively; an end plate coupled to the bus bar frame to cover the bus bar; support blocks coupled to both side surfaces of the end plate to cover one side of a battery cell located at an outermost portion of the cell stack, The support block includes fastening grooves at its top and bottom.

2. The cell stack assembly of claim 1 , wherein the fastening grooves are formed in a plurality of grooves spaced apart from each other at predetermined intervals along a longitudinal direction of the support block.

3. The cell stack assembly according to claim 1 , wherein the support blocks on both sides of the cell stack each include a fastening groove at a position opposite to each other.

4. a cover coupled to the support block to cover at least one of an open upper portion and a closed lower portion of the cell stack, The cell stack assembly of claim 1 , wherein the cover includes a through hole corresponding to a fastening groove of the support block in an area where the cover is in contact with and coupled to the support block.

5. The cell stack assembly according to claim 4 , wherein the support block and the cover are screwed together by bolts that pass through the through holes and are inserted into the fastening grooves.

6. A cell stack assembly according to any one of claims 1 to 5; a pack case in which a plurality of the cell stack assemblies are arranged, The cell stack assemblies are arranged such that at least one side of a support block of an adjacent cell stack assembly is in contact with one surface of the support block of the adjacent cell stack assembly.

7. the pack case includes a bottom hole formed through a bottom thereof in correspondence with a position of a fastening groove formed in a lower portion of the cell stack assembly, The battery pack according to claim 6 , wherein the cell stack assembly is coupled to the pack case by bolts inserted into the fastening grooves and bottom holes.

8. a fixing member coupled to a support block of each of the at least two cell stack assemblies arranged in the pack case so as to fix the at least two cell stack assemblies, The fixing member includes a fixing hole formed at a position corresponding to the fastening groove of each of the support blocks, The battery pack according to claim 6 , wherein the fixing member is screw-coupled to the support block by a bolt inserted into the fixing hole and a fastening groove corresponding to the fixing hole.

9. The battery pack according to claim 8 , wherein both ends of the fixing member are respectively coupled to two adjacent support blocks to fix a pair of cell stack assemblies.

10. The fixing member is formed to extend along the longitudinal direction of two adjacent support blocks, The battery pack according to claim 8 , wherein the fixing holes are spaced apart along a longitudinal direction of the fixing member to correspond to the fastening grooves of the support blocks.

11. The battery pack according to claim 8 , wherein the fixing member is extended in a width direction of the support block to fix a plurality of cell stack assemblies and is coupled to at least four support blocks.

12. The battery pack according to claim 11 , wherein the fixing member extends across the cell stack included in the cell stack assembly and supports an upper portion of the cell stack.

13. The pack case includes a lower plate for supporting a lower portion of the cell stack assembly to be disposed. a sidewall formed along an edge of the lower plate to enclose a side surface of the cell stack assembly, The side wall includes a seating portion protruding toward the cell stack assembly on an inner surface thereof, the support block of the cell stack assembly includes a protrusion protruding toward at least one of a front surface and a rear surface of the cell stack assembly, The battery pack according to claim 6 , wherein the cell stack assembly is disposed in the pack case such that the protrusion is seated on the seat of the side wall.

14. The seating portion includes a seating groove at an upper portion, The protrusion includes a protrusion hole formed through an upper portion and a lower portion, The battery pack of claim 13 , wherein the cell stack assembly is screw-coupled to the side wall by bolts inserted into the protruding holes and the seating grooves.

Images