Cell module assembly, battery pack, and energy storage system

Abstract

A cell module assembly, according to one embodiment of the present invention, may comprise: a battery cell stack in which a plurality of battery cells are stacked; and a blocking unit disposed between at least one and at least another one of the plurality of battery cells, wherein the blocking unit may include a plurality of support plates and a first buffer member that is interposed between adjacent support plates.

Description

Cell module assemblies, battery packs and energy storage devices

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0005424, filed January 12, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a cell module assembly, a battery pack and an energy storage device, and more particularly, to a cell module assembly, a battery pack and an energy storage device including a blocking unit for preventing heat transfer between battery cells during a thermal event of the battery cells.

[0004] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based secondary batteries.

[0005] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. Lithium secondary batteries comprise an electrode assembly comprising positive and negative plates coated with the positive and negative electrode active materials, respectively, with a separator interposed between them, and an outer case, i.e., a battery case, that seals and encloses the electrode assembly together with an electrolyte.

[0006] In general, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is built into a metal can and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0007] These secondary batteries are widely used not only in small devices like portable electronic devices, but also in medium- to large-sized devices like electric vehicles and energy storage systems (ESS), and their use is rapidly increasing. Furthermore, the use of battery packs for power storage, not only in vehicles but also in homes, is on the rise.

[0008] There is a growing need for cell module assemblies and battery packs including the same that ensure stability even when thermal events occur within the battery cells.

[0009] Accordingly, the present invention aims to provide a cell module assembly, a battery pack, and an energy storage device including a blocking unit for preventing heat transfer between battery cells during a thermal event of the battery cells.

[0010] In addition, the purpose is to provide a method for further enhancing the heat transfer prevention effect of a blocking unit included in a cell module assembly, battery pack, and energy storage device.

[0011] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0012] A cell module assembly according to one embodiment of the present invention includes: a battery cell stack in which a plurality of battery cells are stacked; and a blocking unit disposed between at least one of the plurality of battery cells and at least another one of the plurality of battery cells, wherein the blocking unit may include a plurality of support plates and a first buffer member interposed between adjacent support plates.

[0013] The above support plate has a plate shape and is made of a material having rigidity and fire resistance, and the first buffer member has a plate shape and may be made of a compressible material.

[0014] The above support plate may be a metal plate, and the first buffer member may be a silicone pad.

[0015] The support plate prevents heat transfer to a neighboring battery cell during a thermal event of the battery cell, and the first buffer member can be compressed between the support plates by a pressure applied to the blocking unit during swelling of the battery cell.

[0016] The above support plates are formed in a pair, and the first buffer member can be interposed between the pair of support plates.

[0017] The blocking unit further includes a pair of second buffer members, and the pair of second buffer members can be respectively arranged at the outermost part of the blocking unit.

[0018] The above second buffer member has a plate shape and may be made of a compressible material.

[0019] The second buffer member may be a silicone pad.

[0020] The second buffer member may be compressibly deformed to fit the outer surface of the swelling battery cell when the battery cell is swollen.

[0021] The above blocking unit may be formed in the order of the second buffer member, the support plate, the first buffer member, the support plate, and the second buffer member.

[0022] The materials of the first buffer member and the second buffer member may be the same.

[0023] At least one protrusion may be provided at the lower end of the above support plate.

[0024] The thickness of each of the plurality of support plates may be the same.

[0025] The battery cell may further include a pair of busbar housings disposed on both sides of the stack of battery cells, each having an opening through which the electrode leads of the battery cell pass; and a pair of end plates each connecting both ends of the pair of busbar housings.

[0026] A battery pack according to an embodiment of the present invention may include a cell module assembly according to the above-described embodiments; a power unit including the BMS disposed on one surface of the cell module assembly; and a pack case that accommodates the cell module assembly and the power unit.

[0027] An energy storage device according to an embodiment of the present invention may include a battery pack according to the embodiments described above.

[0028] According to an embodiment of the present invention, even if a thermal event occurs inside a battery pack, that is, if an issue such as thermal runaway or fire occurs in some battery cells, it is possible to effectively prevent such an issue from being transferred to other battery cells.

[0029] In addition, the heat transfer prevention effect of the blocking unit included in the cell module assembly, battery pack, and energy storage device can be more effectively improved.

[0030] In addition, according to an embodiment of the present invention, a cell module assembly, battery pack, and energy storage device having a simple structure but enhanced stability during a thermal event of a battery cell can be provided.

[0031] In addition, various other additional effects can be achieved by embodiments of the present invention. These various effects of the present invention will be described in detail in each embodiment, or descriptions of effects easily understandable to those skilled in the art will be omitted.

[0032] FIG. 1 is a perspective view of a cell module assembly including a blocking unit according to one embodiment of the present invention.

[0033] Figure 2 is an exploded perspective view showing the blocking unit in Figure 1 separated.

[0034] Figure 3 is a perspective view showing only the blocking unit included in the cell module assembly of Figure 1.

[0035] Figure 4 is an exploded perspective view of the blocking unit of Figure 3.

[0036] Figure 5 is a top view of the blocking unit of Figure 3.

[0037] Figure 6 is a reference drawing of the blocking unit of Figure 3.

[0038] FIG. 7 illustrates a case in which the cell module assembly and the electric unit of FIGS. 1 to 6 are housed in a pack case to form a battery pack.

[0039] Figure 8 illustrates a completed battery pack in which each component of the battery pack of Figure 7 is assembled.

[0040] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0041] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0042] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0043] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, it means that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the direction opposite to gravity.

[0044] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0045] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0046] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0047]

[0048] FIG. 1 is a perspective view of a cell module assembly (100) including a blocking unit according to one embodiment of the present invention. FIG. 2 is an exploded perspective view showing the blocking unit in FIG. 1 separated.

[0049] Referring to FIGS. 1 and 2, a plurality of battery cells (110) are provided to form a battery cell stack. The cell module assembly (100) includes the battery cell stack, an end plate (120), and a busbar housing assembly (130). In addition, the cell module assembly (100) according to one embodiment of the present invention includes a blocking unit (200). The blocking unit (200) will be described in more detail below.

[0050] First, a pair of end plates (120) are provided on each outermost surface of the battery cell stack. The end plates (120) are arranged parallel to the battery cells (110). In addition, a pair of busbar housing assemblies (130) are arranged on the surface of each battery cell (110) of the battery cell stack facing the electrode leads (111). In the example of Fig. 1, a pair of busbar housing assemblies (130) are arranged on both sides of a plurality of battery cell stacks. Each of the busbar housing assemblies (130) is arranged in a direction perpendicular to the longitudinal direction of the battery cells (110). In addition, a pair of end plates (120) are arranged on the front and rear surfaces of the battery cell stack, respectively. Each end of the pair of busbar housing assemblies (130) is connected by a pair of end plates (120).

[0051] The end plate (120) may be made of, for example, a metal material, such as aluminum, iron, or stainless steel. The busbar housing assembly (130) includes a busbar housing (310) in which a busbar electrode (320) and an ICB (Inter Connector Board, 330) are arranged, and the busbar housing (310) may be made of, for example, a plastic material, and may be manufactured by plastic injection molding.

[0052] A pair of busbar housing assemblies (130) are arranged on both sides of a plurality of battery cell stacks. The busbar housing assembly (130) includes a busbar housing (310), a plurality of busbar electrodes (320) arranged in the busbar housing (310), and an ICB (330).

[0053] A busbar electrode (320) is arranged on the outer surface of the busbar housing (310), and includes a plurality of openings near the positions where the busbar electrode (320) is arranged. The electrode lead (111) of the battery cell (110) passes through the opening of the busbar housing assembly (130) and is coupled to the busbar electrode (320). For reference, in the drawing of the present invention, the electrode leads (111) of each of the neighboring battery cells (110) pass through the opening formed in the busbar housing (310) and are coupled to each other, and the busbar electrode (320) is coupled thereon.

[0054] Additionally, an ICB (330) is arranged on the outer surface of the busbar housing (310). In an embodiment of the present invention, the ICB (330) is arranged on the upper portion of the busbar electrode (320).

[0055] The ICB (330) transmits sensing data between the battery cell (110) and the BMS (410). The ICB (330) is a substrate having at least one element for transmitting sensing data, and includes a printed circuit board (PCB, 331) having a circuit pattern formed on an insulating layer and a sensing cable connector (332) to which a sensing cable (340) is connected. The ICB (330) senses current and / or voltage in the battery cell (110) and transmits the sensed data to the BMS (410) via the sensing cable (340). In addition, the BMS (410) transmits data for maintaining and managing the battery cell (110) to the ICB (330) via the sensing cable (340) and ultimately controls the battery cell (110) electrically connected to the ICB (330).

[0056] Each of the upper side and the lower side between a pair of end plates (120) may include at least one strap (140) connecting the pair of end plates (120). The strap (140) reinforces the fastening of the cell module assembly (100). More specifically, it reinforces the fastening of the pair of end plates (120) and the plurality of battery cell stacks and the blocking unit (200) arranged therebetween. Accordingly, the alignment of the plurality of battery cell stacks can be prevented from being misaligned. In addition, the alignment of the blocking unit (200) arranged between the plurality of battery cell stacks can be prevented from being misaligned.

[0057] The blocking unit (200) is arranged in contact with a large area of ​​the battery cell (110) and is arranged between neighboring battery cells (110). The blocking unit (200) may be arranged parallel to the battery cell (110). For reference, a buffering member (not shown) such as a silicone pad may be arranged between the outermost battery cell (110) of the battery cell stack and the end plate (120). In some cases, the blocking unit (200) may be arranged between the outermost battery cell (110) of the battery cell stack and the end plate (120). The blocking unit (200) may block flames or sparks emitted from a battery cell (110) where a thermal event has occurred in the battery cell (110) from propagating to adjacent battery cells (110), thereby preventing thermal runaway between cells. A blocking unit (200) may be placed between a plurality of battery cells (110), and the examples of FIGS. 1 and 2 illustrate, as an example, a case where a blocking unit (200) is placed every six battery cells (110). The present invention is not limited to what is illustrated, and various modifications and changes are possible.

[0058]

[0059] Fig. 3 is a perspective view of only the blocking unit included in the cell module assembly of Fig. 1. Fig. 4 is an exploded perspective view of the blocking unit of Fig. 3. Fig. 5 is a top view of the blocking unit of Fig. 3. Fig. 6 is a reference drawing of the blocking unit of Fig. 3.

[0060] First, as described above, the blocking unit (200) may be included in multiple units depending on the size of the battery cell stack and the number of battery cells (110). In addition, the blocking unit (200) may be stacked together with the battery cells (110) to form a cell module assembly (100).

[0061] Referring to FIGS. 3 to 5, a blocking unit (200) according to one embodiment of the present invention includes at least two support plates (210) and a first buffer member (220) interposed between adjacent support plates (210). In addition, the blocking unit (200) may additionally include a pair of second buffer members (230) arranged at the outermost portion of the blocking unit (200).

[0062] First, according to the blocking unit (200) of the present invention, at least two support plates (210) are included, and the support plates are spaced apart from each other by interposing a first buffer member (220) between them. Each of the support plates (210) and the first buffer member (220) may have a plate shape. Each of the second buffer members (230) may also have a plate shape.

[0063] The support plate (210) is made of a material having rigidity and fire resistance. When a thermal event occurs in the battery cell (110), the support plate (210) prevents heat transfer to neighboring battery cells (110) or the spread of flames, sparks, etc., while maintaining the structure and rigidity of the blocking unit (200) even at high temperatures, thereby preventing deformation of the blocking unit (200).

[0064] At least one protrusion (211) may be additionally provided at the lower end of the support plate (210). Accordingly, the battery cell stack, which is composed of the battery cells (110) and the blocking unit (200), is supported from below by the protrusion (211) of the support plate (210) of the blocking unit (200). Since the bottom surface of the battery cell stack is supported by the protrusion (211), the battery cell stack can be prevented from sagging downward. In other words, as the size and weight of the battery cell stack increases, there is a concern that the center of the battery cell stack may sag downward (there is a concern that the battery cell stack as a whole may become bent downward). However, according to the present invention, since the protrusion (211) is provided at the lower end of the support plate (210) of the blocking unit (200), the bottom surface of the battery cell stack is supported upward, so that the battery cell stack can be maintained flat as a whole. In the case where the battery cell stack is provided with a plurality of blocking units (200), since the protrusions (211) are also provided with a plurality of protrusions, the bottom surface of the battery cell stack is evenly supported by the plurality of protrusions (211), thereby forming a structure in which the weight of the battery cell stack is distributed and supported. Of course, even in the case where the support plate (210) of the blocking unit (200) is provided with a plurality of protrusions (211), and preferably, the plurality of protrusions (211) are provided in a symmetrical structure, the bottom surface of the battery cell stack is evenly supported by the plurality of protrusions (211), thereby forming a structure in which the bottom surface of the battery cell stack is evenly supported by the plurality of protrusions (211). However, the present invention is not limited to what is illustrated, and various modifications and changes are possible.

[0065] The support plate (210) may be made of, for example, a metal material, a plastic material, or a combination thereof. The metal material may be, for example, aluminum, iron, stainless steel, or a combination thereof. The support plate (210) may be made of a material that is rigid and does not deform structurally even in a high-temperature environment, such as a thermal event of a battery cell (110), and may be selected according to the environment in which the present invention is implemented.

[0066] The first buffer member (220) interposed between the adjacent support plates (210) may be made of silicone, plastic, or a combination thereof. The first buffer member (220) has appropriate elasticity and can absorb the pressure applied to the blocking unit (200) by being compressed when the battery cell (110) swells. If it is made of a plastic material, it may be made of, for example, a flexible plastic. When the battery cell (110) swells, the swollen battery cell (110) presses the blocking unit (200), and at this time, the first buffer member (220) can act as a buffer.

[0067] Likewise, a pair of second buffer members (230) arranged at the outermost portion of the blocking unit (200) may also be made of silicone, plastic, or a combination thereof. The second buffer members (230) have appropriate elasticity and can be compressed and deformed to fit the outer surface of the battery cell (110) that is swollen when the battery cell (110) is swollen. That is, the second buffer members (230) can be concavely deformed and compressed to fit the convex surface of the swollen battery cell (110) to absorb the pressure applied to the blocking unit (200). If the second buffer member is made of a plastic material, it may be made of, for example, a flexible plastic. When the battery cell (110) swells, the swollen battery cell (110) presses the blocking unit (200), and at this time, the first buffer member (220) can act as a buffer.

[0068] The first buffer member (220) and the second buffer member (230) may be made of the same material, or in some cases, may be made of different materials. If both the first buffer member (220) and the second buffer member (230) are made of the same material, the first buffer member (220) and the second buffer member (230) may be made of, for example, both silicone pads.

[0069] An adhesive material may be used to bond between the support plate (210) and the first buffer member (220) and between the support plate (210) and the second buffer member (230).

[0070] In the embodiment of FIG. 3, the blocking unit (200) includes two support plates (210), and a second buffer member (230) is interposed between the two support plates (210). Additionally, the embodiment shows a case in which one second buffer member (230) is included on each of the outermost two sides of the blocking unit (200).

[0071] To elaborate, the embodiment of FIG. 3 illustrates a case where the blocking unit (200) has a five-layer structure of a second buffer member (230) - a support plate (210) - a first buffer member (220) - a support plate (210) - a second buffer member (230).

[0072] FIG. 6 is a reference drawing of the blocking unit of FIG. 3, where (a) of FIG. 6 shows a schematic diagram of the support plate of the blocking unit of the present invention, and (b) of FIG. 6 shows a schematic diagram of the support plate of the blocking unit in the prior art as a comparative example.

[0073] In the prior art, it was common for the blocking unit (200) to have one support plate (210). However, in the embodiment of the present invention, the blocking unit (200) has a plurality of support plates (210) spaced apart from each other by interposing a first buffer member (220).

[0074] Compared to the case where the blocking unit in the prior art includes one support plate (see (b) of FIG. 6), when the blocking unit (200) of the present invention includes n (e.g., 2) support plates (210), but the thickness of each support plate (210) is 1 / n (e.g., 1 / 2) of the thickness of the conventional support plate, and the first buffer member (220) is interposed between each support plate (210), the heat blocking effect (heat transfer prevention effect) is more excellent (see (a) of FIG. 6). Since the first buffer member (220) is interposed between adjacent support plates (210), heat transfer from one support plate (210) to another support plate (210) can be better prevented.

[0075] In detail, assuming that the same amount of material is used to form the support plate in each of the present invention and the prior art, the present invention including n support plates (210) having a thickness of 1 / n has a better heat-blocking effect (heat transfer prevention effect) than the prior art including one support plate having a thickness of 1.

[0076] Meanwhile, for example, the thickness of each of the plurality of support plates (210) may be the same. Similarly, when a plurality of first buffer members (220) are provided, the thickness of each of the first buffer members (220) may be the same. Similarly, the thickness of each of the pair of second buffer members (230) arranged at the outermost side may be the same. The thickness of the first buffer member (220) and the second buffer member (230) may also be the same. However, the present invention is not necessarily limited thereto, and the dimensions may be variously modified and changed to suit the environment in which the present invention is implemented.

[0077] The length of the support plate (210) may be equal to or greater than the length of the first buffer member (220) and / or the second buffer member (230). Accordingly, as described above, the overall structure of the cell module assembly (100) can be maintained even from external physical impact during welding pressure or normal times. The length of the support plate (210) may be equal to or greater than the length of the first buffer member (220) and / or the second buffer member (230). However, the present invention is not necessarily limited thereto, and the dimensions may be variously modified and changed to suit the environment in which the present invention is implemented.

[0078] The height of the support plate (210) may be equal to or greater than the height of each of the first buffer member (220) and / or the second buffer member (230). However, the present invention is not necessarily limited thereto, and the dimensions may be modified and changed in various ways to suit the environment in which the present invention is implemented.

[0079] Referring back to FIG. 1, the electric unit (400) will be briefly described. The electric unit (400) is disposed on one side of the cell module assembly (100) (in the embodiment of FIG. 1, the front side of the cell module assembly (100)). The example of FIG. 1 illustrates a case where the electric unit (400) is disposed on the outer surface of the end plate (120) disposed on the front side of the cell module assembly (100). The electric unit (400) includes a BMS (410), an electric unit housing (420) that accommodates each component of the electric unit (400) (BMS (410), power cable (430), etc.), and a power cable (430). The BMS (410) includes a connector terminal (411) so as to be electrically connected to the sensing cable (340). The electric unit (400) may include various components for controlling or managing the charging and discharging of the battery pack, such as a relay, a fuse, and a current sensor. Each component of the electric unit (400) may be implemented by employing an electric unit provided in a typical battery pack, and therefore, a more detailed description of the electric unit (400) is omitted.

[0080]

[0081] Fig. 7 illustrates a case in which the cell module assembly and the electric unit described in Figs. 1 to 6 are housed in a pack case to form a battery pack. Fig. 8 illustrates a completed battery pack in which each component of the battery pack of Fig. 7 is assembled.

[0082] The battery pack (10) includes the cell module assembly (100) and the electrical unit (400) described above in FIGS. 1 to 6, and the cell module assembly (100) and the electrical unit (400) are housed inside a pack case (500). The battery pack (10) according to an embodiment of the present invention includes a blocking unit (200) as described above in FIGS. 1 to 6.

[0083] The pack case (500) includes a lower case member (510) and an upper case member (520). The lower case member (510) and the upper case member (520) are combined to surround the outer side of the cell module assembly (100). For example, the lower case member (510) may have a generally flat plate shape. For example, the upper case member (520) may have a U-shaped frame shape. The cell module assembly (100) may be mounted on the lower case member (510) having a flat plate shape, and the upper case member (520) may cover the cell module assembly (100).

[0084] However, the present invention is not limited to the above-described, and may be variously changed and modified, such as the lower case member (510) and the upper case member (520) may each be an L-shaped frame or a roll press type mono frame.

[0085] Additionally, the pack case (500) additionally includes a front cover (530) that is placed on the front of the cell module assembly (100) and the electric unit (400).

[0086] An insulating sheet (not shown) having electrical insulation is provided between the cell module assembly (100) and the lower case member (510). In addition, an insulating sheet (not shown) having electrical insulation is provided between the cell module assembly (100) and the upper case member (520). The insulating sheet may be, for example, a film made of PC (polycarbonate), PET, PP, or a combination thereof.

[0087] In addition, an energy storage system (ESS) according to the present invention includes one or more battery packs according to the present invention described above. In addition to the battery packs, the energy storage device according to the present invention may further include general components included in energy storage devices.

[0088]

[0089] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0090] [Explanation of symbols]

[0091] 10: Battery pack

[0092] 100: Cell module assembly

[0093] 110: Battery cell

[0094] 111: Electrode lead

[0095] 120: End Plate

[0096] 130: Busbar housing assembly

[0097] 140: Strap

[0098] 200: Blocking Unit

[0099] 210: Support plate

[0100] 220: First buffer member

[0101] 230: Second buffer member

[0102] 310: Busbar housing

[0103] 320: Busbar electrode

[0104] 330: ICB

[0105] 331: Printed circuit board

[0106] 332: Sensing cable connector

[0107] 340: Sensing Cable

[0108] 400: Battlefield Unit

[0109] 410: BMS

[0110] 420: Battlefield Unit Housing

[0111] 430: Power cable

[0112] 500: Pack Case

[0113] 510: Lower case absence

[0114] 520: Upper case member

[0115] 530: Front cover

Claims

1. A battery cell stack in which a plurality of battery cells are stacked; and A blocking unit is included between at least one of the plurality of battery cells and at least one other, A cell module assembly, wherein the blocking unit comprises a plurality of support plates and a first buffer member interposed between adjacent support plates.

2. In paragraph 1, The above support plate has a plate shape and is made of a material having rigidity and fire resistance. A cell module assembly, wherein the first buffer member has a plate shape and is made of a compressible material.

3. In paragraph 2, The above support plate is a metal plate, A cell module assembly, wherein the first buffer member is a silicone pad.

4. In paragraph 1, The above support plate prevents heat transfer to neighboring battery cells during a thermal event of the battery cell, A cell module assembly, wherein the first buffer member is compressible between the support plates by a pressure applied to the blocking unit when the battery cell swells.

5. In paragraph 1, The above support plates are made in pairs, A cell module assembly, wherein the first buffer member is interposed between the pair of support plates.

6. In paragraph 1, A cell module assembly, wherein the blocking unit further comprises a pair of second buffer members, each of the pair of second buffer members being disposed at the outermost portion of the blocking unit.

7. In paragraph 6, A cell module assembly, wherein the second buffer member has a plate shape and is made of a compressible material.

8. In paragraph 7, A cell module assembly, wherein the second buffer member is a silicone pad.

9. In paragraph 6, A cell module assembly, wherein the second buffer member is compressibly deformable to fit the outer surface of the battery cell that is swollen when the battery cell swells.

10. In paragraph 6, A cell module assembly, wherein the blocking unit is composed of the second buffer member, the support plate, the first buffer member, the support plate, and the second buffer member in that order.

11. In paragraph 6, A cell module assembly wherein the materials of the first buffer member and the second buffer member are the same.

12. In paragraph 1, A cell module assembly, wherein at least one protrusion is provided at the lower end of the support plate.

13. In paragraph 1, A cell module assembly wherein each of the plurality of support plates has the same thickness.

14. In paragraph 1, A pair of busbar housings including openings through which electrode leads of the battery cells pass, and arranged on both sides of the stack of battery cells; and A cell module assembly further comprising a pair of end plates respectively connecting opposite ends of the pair of busbar housings.

15. Cell module assembly according to paragraph 1; A battlefield unit including the BMS arranged on one side of the cell module assembly; and A battery pack comprising a pack case that houses the cell module assembly and the electric unit.

16. An energy storage device comprising a battery pack according to paragraph 15.

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