Battery cell assembly, battery pack including the battery cell assembly, and vehicle

Abstract

According to this disclosure, a battery cell assembly may be provided, comprising: a plurality of battery cell groups arranged in a row, each of the plurality of battery cell groups having a pouch cell or at least two pouch cells stacked on top of each other; a bridging busbar unit disposed between the plurality of battery cell groups and electrically connecting the battery cell groups; and a battery cell cover accommodating the plurality of battery cell groups and the bridging busbar unit, and supporting the pouch cells of the plurality of battery cell groups. Furthermore, a battery pack may be provided, comprising a battery cell assembly, a battery pack tray on which the battery cell assemblies are disposed, and a battery pack cover configured to cover the battery cell assembly.

Description

Technical Field

[0001] This application claims the benefit of Korean Patent Application No. 10-2021-0120657, filed on September 9, 2021, and Korean Patent Application No. 10-2022-0084492, filed on July 8, 2022, the disclosures of which are incorporated herein by reference.

[0002] This disclosure relates to a battery cell assembly, and more specifically, to a battery cell assembly configured to directly mount pouch-type battery cells into a battery pack housing by omitting the conventional battery module assembly process when assembling a battery pack, and a battery pack including the battery cell assembly. Background Technology

[0003] Secondary batteries are gaining attention as a new energy source that improves environmental friendliness and high energy efficiency because they not only have the major advantage of significantly reducing the use of fossil fuels, but also do not produce byproducts generated through energy use.

[0004] Therefore, the application of secondary batteries in various devices is increasing. For example, they are widely used not only as a power source for wireless mobile devices or wearable devices as multifunctional small products, but also as a power source for electric vehicles and hybrid electric vehicles as alternatives to traditional gasoline and diesel vehicles, or as energy storage systems (ESS).

[0005] Typically, a single secondary battery operates at a voltage of approximately 2.5V to 4.5V. Therefore, in electric vehicles or energy storage systems requiring high capacity and high output, battery modules and battery packs with multiple secondary batteries connected in series and / or parallel are configured and then used as energy sources. That is, a conventional battery pack includes battery modules as sub-concepts, and a battery module includes individual battery cells as sub-concepts. Furthermore, the number of individual battery cells included in a battery module or the number of battery modules included in a battery pack can be determined differently depending on the output or capacity required by the electric vehicle.

[0006] As an example, such as Figure 1 As shown, battery modules for a battery pack used in an electric vehicle can be housed within a battery pack housing including crossbeams. Here, the crossbeams are frames used to enhance the rigidity of the battery pack housing and to suppress deformation of the battery pack housing, such as twisting of the battery pack housing due to external impacts. Within the battery pack housing, the internal space can be divided by the crossbeams, and the battery modules can be disposed within the divided spaces S. Although in Figure 1The battery module is illustrated in a very simple way. An actual battery module is configured to include: multiple battery cells, busbars for electrically connecting the multiple battery cells, sensing lines for sensing the voltage and temperature of the battery cells, and a module housing for integrally housing the above components. Furthermore, a BMS (Battery Management System) for managing and controlling the charging / discharging of each battery module and flexible busbars or cables (though not shown) for interconnecting the battery modules are housed inside the battery housing.

[0007] Meanwhile, pouch cells have advantages in several aspects, such as light weight and small unused space during stacking, but they are susceptible to external impacts and have poor assemblability. Therefore, in the case of battery packs using pouch cells, after forming a cell stack by stacking multiple pouch cells, the stacked pouch cells are electrically connected to each other and encapsulated in a module housing to manufacture a battery module, and then one or more of these battery modules are housed in the battery pack housing. As an example, in battery modules included in conventional battery packs, as disclosed in existing literature such as Korean Unexamined Patent Publication No. 10-2015-0044599, various components are used, such as a stacking frame made of plastic material called a cartridge, plates provided at both ends in the cell stacking direction, and fastening members such as bolts, to stack multiple pouch cells to form a cell stack, and then the cell stack is housed inside the module housing.

[0008] In the case of conventional battery packs that include such battery modules, there are disadvantages in terms of energy density. For example, in the process of accommodating multiple battery cells inside a module housing to form a module, various components, such as the module housing or stacking frame, unnecessarily increase the volume of the battery module or reduce the space occupied by the battery cells. Furthermore, to ensure the space occupied by the components themselves, such as the module housing or stacking frame, and the assembly tolerances of these components, the storage space for the battery cells is reduced. Therefore, there are limitations in increasing energy density when assembling battery packs using the aforementioned battery modules.

[0009] Furthermore, in conventional battery packs, since the module housing is housed inside the battery pack housing and the individual battery cells are housed inside the module housing, it is difficult to ensure excellent cooling performance. In particular, when the heat from the individual battery cells housed inside the module housing is dissipated to the outside of the battery pack housing through the module housing, the cooling efficiency deteriorates and the cooling structure becomes more complex.

[0010] However, with the rapid growth of the electric vehicle market, the performance and maximum driving range on a full charge have become increasingly important. Therefore, there is a growing need for new battery packs with higher energy density and superior battery cooling performance compared to conventional battery packs. As part of increasing energy density, CTP (Cell To Pack, referring to the method of directly assembling battery cells inside the battery pack casing by omitting battery module units) battery packs (i.e., module-less battery packs) have recently become a problem, but until recently, there has been no suitable method for installing battery cells in the CTP battery pack casing. Summary of the Invention

[0011] Technical issues

[0012] This disclosure aims to address the problems of the prior art, and therefore aims to provide a battery cell assembly that can be effectively installed in a CTP (Cell to Pack) battery pack.

[0013] In addition, this disclosure aims to provide a battery pack configured to significantly improve energy density by applying individual battery cell components and maximizing the utilization of storage space in the battery pack casing.

[0014] In addition, this disclosure aims to provide a battery pack and vehicle with excellent energy density, assemblability, cooling performance and / or safety.

[0015] The technical problems to be solved by this disclosure are not limited to those described above, and those skilled in the art can clearly understand from the following description of this disclosure other problems not mentioned herein.

[0016] Technical solution

[0017] In one aspect of this disclosure, a battery cell assembly may be provided, comprising: a plurality of battery cell groups arranged in a row, each of the plurality of battery cell groups having a pouch cell or at least two pouch cells stacked on top of each other; a bridging busbar unit disposed between the plurality of battery cell groups and electrically connecting the battery cell groups; and a battery cell cover accommodating the plurality of battery cell groups and the bridging busbar unit, and supporting the pouch cells of the plurality of battery cell groups.

[0018] Multiple battery cell groups may include: a first battery cell group, including one or more first pouch cell battery cells; and a second battery cell group, including one or more second pouch cell battery cells, wherein the first battery cell group, the bridging busbar unit, and the second battery cell group are arranged in a row.

[0019] The battery cell cover can be configured to support the first pouch cell and the second pouch cell in an upright position.

[0020] The battery cell cover can be configured to partially surround the first pouch cell and the second pouch cell, such that the upper or lower sides of the first pouch cell and the second pouch cell are exposed.

[0021] Each of the first pouch cell and the second pouch cell may include: a receiving portion therein for accommodating an electrode assembly; and an edge portion surrounding the receiving portion, and a cell cover may be configured to cover either the upper edge portion or the lower edge portion of the first pouch cell and the second pouch cell, as well as the receiving portion.

[0022] The battery cell cover may include: a lower cover configured to surround the lower edge of the first pouch cell and the second pouch cell; a first side cover configured to extend upward from one end of the lower cover and surround the outer side of the receiving portion on one side of the first pouch cell and the second pouch cell; and a second side cover configured to extend upward from the other end of the lower cover at a position spaced apart from the first side cover and surround the outer side of the receiving portion on the other side of the first pouch cell and the second pouch cell.

[0023] The battery cell cover may include: a top cover configured to surround the upper edge of the first pouch cell and the second pouch cell; a first side cover configured to extend downward from one end of the top cover and surround the outer side of the receiving portion on one side of the first pouch cell and the second pouch cell; and a second side cover configured to extend downward from another end of the top cover at a position spaced apart from the first side cover and surround the outer side of the receiving portion on the other side of the first pouch cell and the second pouch cell.

[0024] The first and second pouch cell battery cells may include sealed and unsealed portions as edges, and the battery cell cover may be configured to surround at least a portion of the sealed portion relative to the first and second pouch cell battery cells, thereby exposing the unsealed portion.

[0025] The battery cell cover may be configured to have a length corresponding to the length of the first pouch cell, the bridging busbar unit, and the second pouch cell arranged in a row in sequence, and may include a recess configured to be partially cut out in an inward direction in at least one of the upper and lower sides of the central region where the bridging busbar unit is located.

[0026] In both the first and second pouch cell, a bidirectional pouch cell with electrode leads protruding in both directions can be used.

[0027] In the first pouch cell, an electrode lead with a first polarity can be connected to a bridging busbar unit, and in the second pouch cell, an electrode lead with a second polarity can be connected to a bridging busbar unit.

[0028] The bridging busbar unit may include: a busbar frame made of electrically insulating material and arranged in a hollow cylindrical shape; and a busbar partially inserted into the busbar frame and made of conductive material, wherein the electrode leads of the first pouch cell and the electrode leads of the second pouch cell can be fixedly contacted with one surface and the other surface of the busbar inside the busbar frame, respectively.

[0029] The busbar frame may include: at least one slot through which electrode leads of a first pouch cell or a second pouch cell are inserted into a side and an opposite side, respectively; and an insertion hole configured to insert the busbar into the upper surface of the busbar frame in a vertical direction.

[0030] The busbar frame may include openings for welding on the side without slots.

[0031] The busbar may include a curved upper end, and the curved upper end may be exposed outside the insertion hole.

[0032] The busbar frame can be configured such that its upper surface is located at a height lower than the upper ends of the first pouch cell and the second pouch cell.

[0033] In another aspect of this disclosure, a battery pack may be provided, comprising: a battery cell assembly group configured by stacking a plurality of the aforementioned battery cell assemblies in a first direction; a battery pack housing including a battery pack tray on which the battery cell assembly group is disposed, and a battery pack cover connected to the battery pack tray and covering the battery cell assembly group; and a voltage sensing unit extending in the first direction, disposed on top of the battery cell assembly group, and electrically connected to a busbar disposed in a bridging busbar unit of each battery cell assembly group.

[0034] The battery cell assembly can be fixedly attached to the upper surface of the battery pack tray.

[0035] The voltage sensing unit is made of insulating material and is disposed on top of the bridging busbar unit. The voltage sensing unit includes: a sensing frame having sensing holes penetrating various areas of the bridging busbar unit; and a sensing circuit board disposed on top of the sensing frame.

[0036] Each sensing terminal on the sensing circuit board can pass through a sensing hole to be electrically connected to the busbar in the bridging busbar unit.

[0037] The battery cell assembly may include a first battery cell assembly and a second battery cell assembly, and the battery cell assembly may include a first crossbeam that extends between the first battery cell assembly and the second battery cell assembly in a second direction intersecting the first direction and is fixedly connected to the battery pack tray.

[0038] The battery pack may include a second crossbeam located on top of the voltage sensing unit, extending in a first direction, and fixedly coupled to the battery pack tray.

[0039] The battery pack housing may include a heat sink, and a thermal resin may be disposed between the first pouch cell and the second pouch cell and the heat sink.

[0040] The heat sink may include an upper heat sink and a lower heat sink respectively disposed on the upper and lower parts of the battery cell cover.

[0041] The battery cell cover can be configured such that at least one end of it is fitted into the battery pack housing.

[0042] The battery cell assembly may include a directional venting space through which gas can move in an upward or downward direction from at least one end of the battery cell cover in the longitudinal direction inside the battery cell cover.

[0043] The battery pack housing may include an exhaust port communicating with a directional exhaust space.

[0044] A rupture disc that ruptures under predetermined pressure or heat can be installed in the exhaust port.

[0045] In another aspect of this disclosure, a vehicle comprising the aforementioned battery pack may be provided.

[0046] Beneficial effects

[0047] According to this disclosure, a battery cell assembly implemented in the form of an integrated long cell can be provided by using a bridging busbar unit to longitudinally connect one or more pouch cell cells and one or more other pouch cell cells.

[0048] By using such battery cell assemblies to directly assemble pouch cells into the battery pack casing, the space utilization of the battery pack can be maximized and the energy density can be significantly improved.

[0049] In other words, according to one embodiment of this disclosure, the module housing of the battery module is omitted when configuring the battery pack. Therefore, by reducing the space occupied by the module housing, more and more individual battery cells can be arranged inside the battery pack housing. This results in a further improvement in the energy density of the battery pack.

[0050] Furthermore, according to this disclosure, the assembly performance of the battery pack can be improved. In particular, according to one embodiment of this disclosure, the processes of preparing a battery module by accommodating pouch cell battery cells in a module housing, and accommodating one or more battery modules prepared above in a battery pack housing, can be omitted. Therefore, the manufacturing process can be simplified and the manufacturing time can be shortened.

[0051] In addition, according to this disclosure, the following configuration can be easily and stably implemented: multiple pouch cell batteries are stacked side by side in the horizontal direction, while standing upright in the battery pack housing in the upward and downward directions.

[0052] Furthermore, according to this disclosure, in the process of accommodating the pouch cell within the battery pack casing, the cell cover can be clamped without directly clamping the pouch cell. Therefore, the processing of the pouch cell can be performed more easily and safely. Moreover, in this case, damage or breakage of the pouch cell can be prevented during battery processing, such as during the process of accommodating the pouch cell inside the battery pack casing.

[0053] Furthermore, according to this disclosure, the cooling efficiency of the battery pack can be further improved. In particular, in one embodiment of this disclosure, since a portion of each pouch cell is directly exposed to the battery pack casing, the heat from each pouch cell can be effectively dissipated to the outside through the battery pack casing.

[0054] In addition, according to one embodiment of this disclosure, surface cooling can be performed additionally through the large surface area of ​​the pouch cell.

[0055] Furthermore, according to one embodiment of this disclosure, the safety of the battery pack can be improved. Specifically, according to one embodiment of this disclosure, gases emitted from each individual battery cell can be smoothly discharged to the outside. Additionally, according to one embodiment of this disclosure, the direction of gas or flame emission from the battery cells can be controlled. Therefore, the propagation of thermal runaway between adjacent battery cells can be effectively prevented.

[0056] In addition to the above, this disclosure may have a variety of other effects, which will be described in various embodiments, or any effects that are readily inferred by those skilled in the art will not be described in detail. Attached Figure Description

[0057] Figure 1 This is a schematic diagram illustrating the configuration of a battery pack according to the prior art.

[0058] Figure 2 This is a perspective view showing the configuration of a battery cell assembly according to an embodiment of the present disclosure.

[0059] Figure 3 These are perspective views showing the battery cell and battery cell cover according to one embodiment of the present disclosure.

[0060] Figure 4 yes Figure 3 Exploded perspective view of the first and second pouch cell and the bridging busbar unit.

[0061] Figure 5 yes Figure 4 Exploded perspective view of the bridging busbar unit.

[0062] Figure 6 yes Figure 3 A magnified view of region A.

[0063] Figure 7 They are shown separately. Figure 5 The upper part of the bridging bus bar unit ( Figure 7 (a) of, a side ( Figure 7 (b) and another side ( Figure 7 The figure of (c)).

[0064] Figure 8 This is a top view of the central region of a battery cell assembly according to an embodiment of the present disclosure.

[0065] Figure 9 It is viewed from the bottom. Figure 8 A diagram of the central area of ​​a single battery cell assembly.

[0066] Figure 10 This is a perspective view showing a battery cell assembly group configured by stacking four battery cell assemblies according to an embodiment of the present disclosure.

[0067] Figure 11 It is along Figure 10 A cross-sectional view of the battery cell assembly taken by line BB′.

[0068] Figure 12 This is a perspective view schematically illustrating the configuration of a battery pack according to an embodiment of the present disclosure.

[0069] Figure 13 This is a perspective view showing the configuration of a plurality of battery cell assembly groups, a first crossbeam, and a battery pack tray in a battery pack according to an embodiment of the present disclosure.

[0070] Figure 14 They are shown separately. Figure 12 A perspective view of the voltage sensing unit and the second crossbeam.

[0071] Figure 15 and Figure 16This is a diagram illustrating the assembly structure of a bridging busbar unit and a voltage sensing unit in a battery pack according to an embodiment of the present disclosure.

[0072] Figure 17 This is an exploded perspective view showing the main configuration of a battery cell assembly according to another embodiment of the present disclosure.

[0073] Figure 18 This is a perspective view of a battery cell assembly according to another embodiment of the present disclosure.

[0074] Figure 19 Viewed from the top Figure 18 A diagram of the central area of ​​a single battery cell assembly.

[0075] Figure 20 Observing from the bottom Figure 18 A diagram of the central area of ​​a single battery cell assembly.

[0076] Figure 21 This is a perspective view of a battery cell assembly group configured by stacking four battery cell assemblies according to another embodiment of the present disclosure.

[0077] Figure 22 yes Figure 21 A partial exploded perspective view of the battery cell assembly.

[0078] Figure 23 This is a perspective view schematically illustrating the configuration of a battery pack according to another embodiment of the present disclosure.

[0079] Figure 24 This is a diagram illustrating the separate main components in a battery pack according to another embodiment of the present disclosure.

[0080] Figure 25 This is a diagram schematically illustrating the cooling configuration of a battery pack according to another embodiment of the present disclosure.

[0081] Figure 26 This is a diagram illustrating a modified example of the cell cover in a battery pack according to another embodiment of the present disclosure.

[0082] Figure 27 This is a diagram illustrating a modified example of a battery pack tray in a battery pack according to another embodiment of the present disclosure.

[0083] Figure 28 This is a diagram showing an end region of a battery cell assembly group in a battery pack according to another embodiment of the present disclosure, viewed from the bottom.

[0084] Figure 29 This is a schematic diagram illustrating the exhaust configuration of a battery pack according to another embodiment of the present disclosure. Detailed Implementation

[0085] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Before the description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its conventional and dictionary meanings, but rather as understood based on the principle that the inventors can appropriately define the terminology for best illustration, and based on the meanings and concepts corresponding to the technical aspects of the present disclosure.

[0086] Furthermore, the descriptions presented herein are merely preferred examples for illustrative purposes and are not intended to limit the scope of this disclosure. Therefore, it should be understood that other equivalent substitutions and modifications can be made without departing from the scope of this disclosure. In the accompanying drawings, for ease of description and clarity, the dimensions of individual elements or specific portions thereof are shown enlarged, omitted, or schematically. Therefore, the dimensions of individual elements do not necessarily reflect their actual dimensions. Detailed descriptions of known functions or configurations will be omitted if they are determined to unnecessarily obscure the essential points of this disclosure.

[0087] As used herein, the terms “joint” or “connection” include not only cases where one component is directly joined or directly connected to another component, but also cases where one component is indirectly joined or indirectly connected to another component through a joint component.

[0088] The battery cell assembly according to this disclosure includes: a plurality of battery cell groups arranged in a row, each of the plurality of battery cell groups having a pouch cell or at least two pouch cells stacked on top of each other; a bridging busbar unit 120 disposed between the plurality of battery cell groups and electrically connected to the battery cell groups; and a battery cell cover 130 accommodating the plurality of battery cell groups and the bridging busbar unit 120, and supporting the pouch cells of the plurality of battery cell groups.

[0089] Here, a battery cell group refers to a single pouch cell 110, or a group of pouch cells 110 stacked together and connected in parallel. That is, in this specification, the first pouch cell 110A corresponds to one battery cell group, and the second pouch cell 110B corresponds to another battery cell group.

[0090] The embodiments described below are merely preferred embodiments of this disclosure and do not represent all technical concepts of this disclosure. That is, unlike the embodiments described below, the battery cell assembly of this disclosure can be configured to include three or more battery cell groups. Therefore, it is to be stated in advance below that the scope of this disclosure should not be construed as limited to a battery cell assembly 100 in which a first pouch battery cell 110A and a second pouch battery cell 110B are connected in series to form two battery cell groups arranged in a row and partially surrounded by a battery cell cover 130.

[0091] Figure 2 This is a perspective view showing the configuration of a battery cell assembly 100 according to an embodiment of the present disclosure. Figure 3 These are perspective views showing the battery cell and battery cell cover 130 according to one embodiment of the present disclosure. Figure 4 yes Figure 3 Exploded perspective view of the first pouch cell 110A, the second pouch cell 110B, and the bridging busbar unit 120.

[0092] Reference Figures 2 to 4 According to one embodiment of the present disclosure, a battery cell assembly 100 includes: one or more first pouch cell battery cells 110A; one or more second pouch cell battery cells 110B arranged in a row with the first pouch cell battery cells 110A along the longitudinal direction (X direction) of the first pouch cell battery cells; a bridging busbar unit 120 disposed between the first pouch cell battery cells 110A and the second pouch cell battery cells 110B, and electrically connected to the first pouch cell battery cells 110A and the second pouch cell battery cells 110B; and a battery cell cover 130 partially surrounding and supporting the battery cell including the first pouch cell battery cells 110A, the bridging busbar unit 120 and the second pouch cell battery cells 110B.

[0093] A pouch cell 110 includes: an electrode assembly, an electrolyte, a pouch housing for sealing and containing the electrode assembly and the electrolyte, and electrode leads 111 connected to the electrode assembly and extending from the pouch housing. The electrode leads 111 include a positive electrode lead 111A and a negative electrode lead 111B forming a pair. Here, the positive electrode lead 111A and the negative electrode lead 111B are disposed at both ends of the battery cell in the longitudinal direction (X-axis direction). A pouch cell 110 having a pair of electrode leads 111 configured as described above is referred to as a bidirectional pouch cell 110. A battery cell assembly 100 according to an embodiment of this disclosure may include a bidirectional pouch cell 110.

[0094] The first pouch cell 110A may include one pouch cell 110 or two or more pouch cells 110 stacked facing each other. For example, as in this embodiment. Figure 2 and Figure 3 As shown, three pouch cell 110s can be stacked in a first direction (Y-axis direction) to form a group of first pouch cell 110A. Furthermore, electrode leads 111 of the same polarity can all be arranged in the same direction, so that the three pouch cell 110s are connected in parallel (3P) to form a group. That is, as... Figure 3 As shown, three first pouch cell 110A can be configured to form a group by overlapping three positive leads 111A and correspondingly overlapping three negative leads 111B.

[0095] The second pouch cell 110B may include the same number of pouch cells as the first pouch cell 110A. That is, the second pouch cell 110B may also include one pouch cell 110 or two or more pouch cells 110 stacked facing each other. For example, similar to three first pouch cells, a group of second pouch cells 110B can be configured to form a group by stacking three pouch cells 110.

[0096] A set of first pouch cell 110A and another set of second pouch cell 110B can be electrically connected to each other. For example, the negative lead 111B of the first pouch cell 110A can be electrically connected to the positive lead 111A of the second pouch cell 110B, such that the first pouch cell 110A and the second pouch cell 110B are connected in series. From an electrical point of view, the first pouch cell 110A and the second pouch cell 110B according to this embodiment can be configured to be connected in series and in parallel in a 3P2S configuration. From a structural point of view, they can be configured to be connected and integrated longitudinally in the same form as a single long cell.

[0097] Meanwhile, as another example from the above embodiments, the battery cell assembly 100 according to this disclosure can be longitudinally electrically connected to the pouch cell 110 in the form of nPmS (n is a natural number, m is a natural number greater than 2), and can be implemented in the same form as an integrated long battery. That is, for example, depending on the thickness of the pouch cell 110, the battery cell assembly 100 can be implemented in the form of increasing the number of parallel connections to 1P, 2P, 3P, ..., etc., or depending on the length of the pouch cell 110, it can be implemented in the form of increasing the number of series connections to 2S, 3S, 4S, ..., etc. In this case, the battery cell assembly 100 can be arranged in a row with the first pouch cell 110A and the second pouch cell 110B, and may also include another set of pouch cells and bridging busbar unit 120.

[0098] In the following text, for ease of description, electrode leads 111 will be divided into electrode leads 111 with a first polarity and circuit leads 111 with a second polarity. Here, the first polarity and the second polarity are relative to the polarity of the electrode leads 111. That is, if the first polarity is positive, then the second polarity is negative. Conversely, if the first polarity is negative, then the second polarity is positive.

[0099] The bridging busbar unit 120 can be configured such that the first polarity electrode lead 111 of the first pouch cell 110A can be integrally overlapped and connected on one side, and the second polarity electrode lead 111 of the second pouch cell 110B can be integrally overlapped and connected on the other side.

[0100] For example, refer to Figures 3 to 4 In the first pouch cell 110A, the negative electrode lead 111B can be connected to the left side of the bridging busbar unit 120 in the +X axis direction, and in the second pouch cell 110B, the positive electrode lead 111A can be connected to the right side of the bridging busbar unit 120 in the -X axis direction. The positive electrode lead 111A and the negative electrode lead 111B can be electrically connected to each other by soldering to the surface of the busbar 123 inside the bridging busbar unit 120.

[0101] More specifically, such as Figure 5 As shown, the bridging busbar unit 120 includes a busbar frame 121 and a busbar 123 having a curved upper end 123a.

[0102] The busbar frame 121 is made of electrically insulating material and can be configured as a hollow cylinder with a rectangular cross-section. Furthermore, the busbar frame 121 may include: an insertion hole 121a through which the busbar 123 can be vertically inserted into the upper surface of the busbar frame 121; at least one slot 121b through which the electrode leads 111 of the first pouch cell 110A and the second pouch cell 110B can be inserted into one side and the opposite side, respectively; and openings 121c for welding on the two sides without slots 121b.

[0103] Additionally, the busbar frame 121 can be configured to have a height lower than the width in the width direction (Z-axis direction) of the first pouch cell 110A and the second pouch cell 110B. For example... Figure 5 As shown, when assembling the bridging busbar unit 120 and the first pouch cell 110A and the second pouch cell 110B using the busbar frame 121, the upper surface of the busbar frame 121 is configured to be lower than the upper ends of the first pouch cell 110A and the second pouch cell 110B. As will be described below, when assembling the battery pack 1, the space in the upper part of the bridging busbar unit 120 in this configuration can be used as mounting space for the voltage sensing unit 30 and the second crossbeam 50.

[0104] In addition, such as Figure 6 As shown, the busbar frame 121 includes a recessed portion 121e, the lower surface of which is recessed in the upward direction (Z-axis direction). The recessed portion 121e can serve as space to avoid interference with the third crossbeam 24 disposed in the battery pack tray 21 during later assembly of the battery pack 1.

[0105] Busbar 123 is made of a conductive metallic material, such as copper or nickel, and is arranged in a rod shape with its upper end bent. The remainder of busbar 123, except for the bent upper end 123a, is inserted into busbar frame 121 through insertion hole 121a. Insertion hole 121a is configured to have a size equal to or slightly larger than the cross-sectional area of ​​busbar 123, such that the bent upper end 123a of busbar 123 is not inserted. With this configuration, the bent upper end 123a of busbar 123 can be mounted on a support plate 121d of busbar frame 121 surrounding insertion hole 121a, so that its upper surface can be positioned facing upwards. By exposing the bent upper end 123a of busbar 123 to the outside of busbar frame 121 in this manner, the sensing terminal of voltage sensing unit 30 can easily contact busbar 123 during later assembly of battery pack 1.

[0106] like Figure 6 and Figure 7In the illustrated embodiment, the first pouch cell 110A and the second pouch cell 110B may extend in opposite directions relative to the bridging busbar unit 120 and may be connected in series.

[0107] like Figure 7 As shown in (a), the negative lead 111B of the first pouch cell 110A can be inserted into the busbar frame 121 through the slot 121b on one side of the busbar frame 121, and the positive lead 111A of the second pouch cell 110B can be inserted into the busbar frame 121 through the slot 121b on the other side of the busbar frame 121.

[0108] The negative electrode lead 111B of the first pouch cell 110A inserted into the busbar frame 121 can be fixedly contacted to a surface of the busbar 123 by laser welding. For example, as Figure 7 As shown in (b), the welding laser beam can be irradiated to the negative lead 111B through an opening 121c of the busbar frame 121, and the negative lead 111B can be welded to a surface of the busbar 123.

[0109] Additionally, the positive lead 111A of the second pouch cell 110B inserted into the busbar frame 121 can be fixedly contacted to the other surface of the busbar 123 by laser welding. Similar to the negative lead 111B of the first pouch cell 110A, as shown in Figure 7(c), the welding laser beam can irradiate the positive lead 111A through another opening 121c of the busbar frame 121, and the positive lead 111A can be welded to the other surface of the busbar 123.

[0110] Simultaneously, the battery cell cover 130 can be configured to partially cover the first pouch cell 110A and the second pouch cell 110B, such that at least one side of the first pouch cell 110A and the second pouch cell 110B is exposed to the outside. That is, the battery cell cover 130 does not necessarily completely cover the first pouch cell 110A and the second pouch cell 110B, but can be configured to cover only a portion of them. The configuration of the battery cell cover 130 described above facilitates easy assembly of the first pouch cell 110A and the second pouch cell 110B to the battery cell cover 130. Furthermore, when the battery cell assembly 100 is assembled to the battery pack housing 20, it is used to expose at least one side of the first pouch cell 110A and the second pouch cell 110B towards the battery pack housing 20.

[0111] For example, refer to Figure 2 and Figure 3In one embodiment, the battery cell cover 130 can be configured to surround a battery cell including a first pouch cell 110A, a bridging busbar unit 120, and a second pouch cell 110B arranged in a row, but the top of the surrounded battery cell may not be covered.

[0112] In this case, such as Figure 12 As shown, during battery pack assembly, the battery cell assembly 100 is mounted on the battery pack tray 21 such that the upper edges E1 of the first pouch cell 110A and the second pouch cell 110B face the battery pack cover 22. Thermal resin is applied to the upper edges E1 and covers the battery pack cover, thereby directly transferring heat from each pouch cell 110 to the battery pack cover 22 via the thermal resin. With this configuration, since a separate cooling structure is not required between the pouch cell 110 and the battery pack housing 20, the cooling configuration can be simple and effective.

[0113] Refer again Figures 2 to 4 The pouch cell 110 may include a receiving portion indicated by R and edge portions indicated by E1 to E4. Here, the receiving portion R may be a portion that houses an electrode assembly, which is configured such that a positive electrode plate and a negative electrode plate are stacked on top of each other and a separator is inserted between them. Furthermore, an electrolyte may be contained within the receiving portion R. Additionally, the edge portions E1 to E4 may be arranged around the receiving portion R.

[0114] Specifically, the edge portion can be a sealing portion of the soft-pack casing that seals the housing of the soft-pack battery cell 110. For example, in Figure 4 In this context, it can be assumed that, relative to the receiving portion R, the four edge portions are respectively located at the upper edge, lower edge, front edge, and rear edge. In this case, all four edge portions E1 to E4 can be sealing portions. Alternatively, a portion of the four edge portions E1 to E4 can be configured as folded portions instead of sealing portions. For example, in... Figure 4 In this embodiment, the lower edge E2 can be a folded portion of the soft-pack housing, and the upper edge E1, the front edge E3, and the rear edge E4 can all be sealed portions. Here, a battery cell in which all four edges E1 to E4 are sealed can be referred to as a four-sided sealed battery cell, and a battery cell in which three edges E1, E3, and E4 are sealed can be referred to as a three-sided sealed battery cell.

[0115] In this configuration, the battery cell cover 130 can be configured to surround both sides and a portion of the edge portions E1 to E4 of the receiving portion R of the first pouch cell 110A and the second pouch cell 110B. For example, when a battery cell cover 130 is configured to surround a plurality of stacked pouch cells 110, it can be configured to surround the outer surface of the receiving portion of the outermost pouch cell 110 and the upper or lower edge portion of the entire pouch cell 110.

[0116] As a more specific example, such as Figures 2 to 3 As shown, it can be configured as follows: a battery cell cover 130 surrounds three first pouch cell 110A and second pouch cell 110B stacked in the left-right direction (±Y direction). In this case, the battery cell cover 130 can be configured to surround the outer surface of the receiving portion R of the left outermost battery cell of the first pouch cell 110A and the second pouch cell 110B, the lower edge portion E2 of the first pouch cell 110A and the second pouch cell 110B, and the outer surface of the receiving portion R of the right outermost battery cell of the first pouch cell 110A and the second pouch cell 110B.

[0117] Meanwhile, as another example of this embodiment, the battery cell cover 130 can be configured to surround the upper edge E1 of the first pouch cell 110A and the second pouch cell 110B instead of the lower edge E2. As yet another example, when a battery cell cover 130 is configured to surround the first pouch cell 110A and the second pouch cell 110B, which are respectively formed by a pouch cell 110, the battery cell cover 130 can be configured to surround the two surfaces (e.g., the left and right surfaces of the same receiving portion R) of the pouch cell 110 and the upper edge E1 or the lower edge E2.

[0118] According to this embodiment, the following configuration can be easily achieved: one or more pouch cell battery cells 110 are supported and protected by a battery cell cover 130. Furthermore, according to this embodiment, the processing of one or more pouch cell battery cells 110 can be easily and safely performed through the battery cell cover 130. Additionally, according to this embodiment, a battery cell cover 130 can face the surfaces of two receiving portions R relative to the pouch cell battery cells 110 housed therein. Therefore, the cooling performance between the receiving portions R and the battery cell cover 130 can be further improved. In particular, in this case, surface cooling can be achieved through the wide surface of the receiving portion R, thereby improving cooling efficiency.

[0119] Furthermore, the battery cell cover 130 can be configured such that the edges of the two ends located in the longitudinal (±X direction) direction of the first pouch cell 110A and the second pouch cell 110B housed therein are not surrounded. That is, the battery cell cover 130 can be configured to surround one of the upper edge E1 and lower edge E2 of the first pouch cell 110A and the second pouch cell 110B, except for the front edge E3 of the first pouch cell 110A which is provided with electrode leads of the first polarity and the rear edge E4 of the second pouch cell 110B which is provided with electrode leads of the second polarity.

[0120] According to embodiments of this disclosure, the exhaust direction of flames, etc., can be guided to the exposed side of the battery cell cover 130. For example, according to this embodiment, since the front and rear sides of the battery cell cover 130 where the electrode leads 111 are located are open, flames, etc., can be exhausted along the open direction. In particular, when the battery cell cover 130 is configured in a shape with the front and rear sides open as described above, lateral exhaust can be easily achieved.

[0121] The battery cell cover 130 can be configured to partially surround the battery cell, which includes a first pouch cell 100A, a bridging busbar unit 120, and a second pouch cell 100B arranged in a row.

[0122] Reference Figure 2 and Figure 3 as well as Figure 8 and Figure 9 The battery cell cover 130 can be configured to be generally U-shaped, which can tightly press the two outermost surfaces of the first pouch cell 110A and the second pouch cell 110B and expose the upper edges E1 of the first pouch cell 110A and the second pouch cell 110B, thereby supporting the first pouch cell 110A and the second pouch cell 110B in a row. When an external impact or vibration occurs, the battery cell cover 130 can be used to prevent the first pouch cell 110A and the second pouch cell 110B from twisting in a clockwise or counterclockwise direction about the bridging busbar unit 120.

[0123] Furthermore, since the battery cell cover 130 is provided with a thin plate having excellent mechanical rigidity and thinness, space loss can be minimized when the battery pack 1 is assembled later. For example, when the battery cell cover 130 is made of a metal material with excellent rigidity (e.g., steel, and in particular, SUS material), the upright position of the battery cell can be maintained more stably. Therefore, when the battery cell is assembled into the battery pack 1 later, the upright position of the battery cell can be supported more reliably.

[0124] More specifically, such as Figure 2 and Figure 3 As shown, the battery cell cover may include a lower cover 131, a first side cover 132, and a second side cover 133.

[0125] Here, the lower cover 131 can be configured to surround the lower edge E2 of the first pouch cell 110A and the second pouch cell 110B housed therein. Specifically, the lower cover 131 can be configured to contact or be spaced apart from the lower edge E2 of the first pouch cell 110A and the second pouch cell 110B. Furthermore, the lower cover 131 can be configured to be planar.

[0126] The first side cover 132 can be configured to extend from one end of the lower cover 131 in an upward direction (+Y direction). For example, the first side cover 132 can be configured to extend from the left end of the lower cover 131 in an upward direction (+Z direction in the figure). Furthermore, the first side cover 132 can be formed in a planar shape.

[0127] Additionally, the first side cover 132 can be configured to surround the outer side of the receiving portion on one side of the first pouch cell 110A and the second pouch cell 110B housed therein. Here, the first side cover 132 can be configured to directly contact the outer surface of the receiving portion R, or it can be glued with an adhesive.

[0128] The second side cover 133 can be configured to be horizontally spaced from the first side cover 132 and can be configured to extend upward from the other end (-Y direction) of the lower cover 131. For example, the second side cover 133 can be configured to extend upward from the right end of the lower cover 131 (+Z direction in the figure). Furthermore, the second side cover 133 can also be configured with a planar shape similar to the first side cover 132. In this case, the second side cover 133 and the first side cover 132 can be configured to be parallel to each other.

[0129] Additionally, the second side cover 133 can be configured to surround the outer side of the receiving portion on the other side of the first pouch cell 110A and the second pouch cell 110B housed therein. Here, the second side cover 133 can be configured to directly contact the outer surface of the receiving portion, or it can be glued with an adhesive.

[0130] The cross-sectional area of ​​the first side cover 132 and the second side cover 133 is larger than the cross-sectional area of ​​the first soft-pack battery cell 110A and the second soft-pack battery cell 110B that are arranged in a row facing the first side cover 132 and the second side cover 133, thereby preventing the housing R from being exposed to the outside and thus ensuring safety as much as possible.

[0131] Additionally, the battery cell cover 130 can be configured to have a length corresponding to the length of the first pouch cell 110A, the bridging busbar unit 120, and the second pouch cell 110B arranged in a row in sequence. For example, as Figure 3 As shown, the first pouch cell 110A and the second pouch cell 110B can be configured to extend from one end to the other. For reference, unlike this embodiment, when a group of pouch cells 110 extends further in the longitudinal direction to 3S, 4S, ... etc. to form a battery pack 100, the battery cell cover 130 can be configured to have a length capable of accommodating all the pouch cells 110 extending in the longitudinal direction.

[0132] Specifically, the battery cell cover 130 according to this embodiment may include recesses 135 and 136, which are configured to be partially cut inward in at least one of the upper and lower ends of the location where the bridging busbar unit 120 is received.

[0133] In the battery cell cover 130 according to this embodiment, such as Figure 3 As circled in the diagram, recesses can be provided at two locations, the upper end and the lower end, of the battery cell cover 130. Hereinafter, the recess at the upper end of the battery cell cover 130 is referred to as the upper recess 135, and the recess at the lower end of the battery cell cover 130 is referred to as the lower recess 136.

[0134] like Figure 2 As shown, the battery cell assembly 100 according to this embodiment can be provided in a form in which the central region where the bridging busbar unit 120 is located is recessed inward.

[0135] For example, such as Figure 6 As shown, in the bridging busbar unit 120, the upper surface portion of the busbar frame 121 is lower than the upper edge E1 of the first pouch cell 110A and the second pouch cell 110B. Therefore, when the bridging busbar unit 120 is housed in the cell cover 130, as... Figure 8 As shown, its upper surface portion can be configured not to protrude above the upper recess 135, and as... Figure 9 As shown, its lower surface portion can be configured not to protrude below the lower recess 136.

[0136] like Figure 10 As shown, when multiple battery cell assemblies 100 configured as described above are stacked to form a battery cell assembly group 10, the battery cell assembly group 100 has a valley-shaped structure, and the upper recess 135 and lower recess 136 of each battery cell assembly 100 are connected in one direction (±Y direction) within this valley-shaped structure. Figures 12 to 14As shown, when assembling battery pack 1, the valley structure can be used as the mounting space for voltage sensing unit 30, second crossbeam 50 and third crossbeam 24.

[0137] Simultaneously, when multiple battery cell modules 100 having the above configuration are stacked in the first direction, it is possible to fabricate a structure as described above. Figure 10 The battery cell assembly 10 is shown. Specifically, as shown... Figure 10 As shown, the battery cell assembly 10 is configured by stacking four battery cell assemblies 100 in a first direction (Y direction). At this time, as... Figure 11 As shown, the electrode lead 111 of the first pouch cell 110A of each battery cell assembly 100, having a first polarity, overlaps and is in fixed contact with one surface of the busbar 123 of each bridging busbar unit 120, and the electrode lead 111 of the second pouch cell 110B, having a second polarity, overlaps and is in fixed contact with the other surface of the busbar 123 of each bridging busbar unit 120, thereby connecting them in series.

[0138] Additionally, the front busbar unit 200 and the rear busbar unit 300 can be used to electrically connect four battery cell assemblies 100. For example... Figure 10 As shown, the front busbar unit 200 includes: a front external busbar frame made of insulating material, configured to integrally cover the front of four battery cell assemblies 100 in the +X axis direction; and a plurality of plate-shaped busbars mounted on the front external busbar frame; and the rear busbar unit 300 includes: a rear busbar frame made of insulating material, configured to integrally cover the rear of four battery cell assemblies 100 in the -X axis direction; and a plurality of plate-shaped busbars mounted on the rear busbar frame.

[0139] Each of the front and rear busbar frames may include a slot in the Z-axis direction, into which electrode leads 111 can be inserted to be led out to the outside of the busbar frame, and the extracted portion can be welded to the plate-shaped busbar. The four battery cell assemblies 100 can also be electrically connected to each other through the front busbar unit 200 and the rear busbar unit 300.

[0140] Figure 12 This is a perspective view schematically illustrating the configuration of a battery pack according to an embodiment of the present disclosure. Figure 13 This is a perspective view showing the configuration of a plurality of battery cell assembly groups, a first crossbeam, and a battery pack tray in a battery pack according to an embodiment of the present disclosure. Figure 14 They are shown separately. Figure 12 A perspective view of the voltage sensing unit and the second crossbeam. Figure 15 and Figure 16This is a diagram illustrating the assembly structure of a bridging busbar unit and a voltage sensing unit in a battery pack according to an embodiment of the present disclosure.

[0141] Hereinafter, the battery pack 1 according to the present disclosure, configured by applying the above-described battery cell assembly 100, will be described in detail with reference to the accompanying drawings.

[0142] According to one embodiment of the present disclosure, a battery pack 1 includes: a plurality of battery cell assembly groups 10 stacked in a first direction (Y direction); a battery pack housing 20 for accommodating the plurality of battery cell assembly groups 10; a voltage sensing unit 30; crossbeams 23, 40, 50; and a battery control system 60.

[0143] like Figure 12 As shown, the multiple battery cell assembly groups 10 can be referred to as components of the battery cell assembly 100 described above, and can be housed in the battery pack housing 20.

[0144] Multiple battery cell module groups 10 can be divided into a first battery cell module group 10A and a second battery cell module group 10B. It can be seen that dividing the multiple battery cell module groups 10 into a first battery cell module group 10A and a second battery cell module group 10B is for easy differentiation based on... Figures 12 to 13 The first crossbeam 40 of the battery pack tray 21 contains battery cell assembly groups located in the +Y axis direction and battery cell assembly groups located in the -Y axis direction.

[0145] The battery pack housing 20 may include a battery pack tray 21 and a battery pack cover 22.

[0146] The battery pack tray 21 may include a base plate 21B having a generally wide rectangular plate shape and four side plates forming walls along the outer perimeter of the base plate 21B. Furthermore, the first crossbeam 40, the second crossbeam 50, the third crossbeam 24, and the partition wall 23 may be integrally formed or additionally assembled to the battery pack tray 21. The first crossbeam 40, the second crossbeam 50, the third crossbeam 24, and the partition wall 23 can prevent the battery pack tray 21 from deforming, for example, deforming, by supporting the base plate 21B and side plates of the battery pack tray 21 during external impacts or vibrations. That is, as described above, by adding the first crossbeam 40, the second crossbeam 50, the third crossbeam 24, the partition wall 23, etc., the battery pack tray 21 can have higher mechanical rigidity.

[0147] like Figure 13As shown, the battery cell assembly 100 can fill the space surrounded by the bottom plate 21B, partition wall 23, side plates in the -X axis direction, and side plates in the ±Y axis direction inside the battery pack tray 21. Here, as described above, the battery cell assembly 100 can be configured in the form of a long battery, with the battery cell cover 130 partially surrounding the first pouch cell 110A, the bridging busbar unit 120, and the second pouch cell 110B arranged in a row. The battery cell assembly group 10 is formed by stacking the battery cell assemblies 100, and the multiple battery cell assembly groups 10 are configured to be in close contact with the battery pack tray 21, thereby minimizing the unused space in the battery pack tray 21.

[0148] The battery cell assembly 10 can be configured to be adhered to and fixed to the base plate 21B of the battery pack tray 21. For this purpose, an adhesive G or adhesive sheet can be provided on the base plate 21B of the battery pack tray 21. Here, the adhesive can be a thermosetting resin. Preferably, the adhesive G or adhesive sheet can have excellent thermal conductivity. In this case, the heat from the pouch cell 110 can be radiated to the outside more effectively. Although not shown, a heat sink can be provided between the adhesive and the base plate 21B of the battery pack tray 21, or by installing a heat sink under the base plate 21B of the battery pack tray 21, which can be configured to absorb the heat radiated by the pouch cell 110.

[0149] The battery pack cover 22 can be provided in a form that covers multiple battery cell assembly groups 10 and other components, and can be configured to be combined with the battery pack tray 21. For example, the battery pack cover 22 and the battery pack tray 21 can be configured to be combined with each other by means of, for example, bolts, adhesive, snap-fit, welding, etc.

[0150] Meanwhile, since the battery cell assembly 100 is configured with the first pouch cell 110A and the second pouch cell 110B connected in series, voltage sensing is required at the location where the first pouch cell 110A and the second pouch cell 110B are connected in parallel. Therefore, the battery pack of this disclosure includes a voltage sensing unit 30 for voltage sensing. The voltage sensing unit 30 is connected to the busbar 123 of the bridging busbar unit 120 of each battery cell assembly 100 at the location where the first pouch cell 110A and the second pouch cell 110B are connected in series.

[0151] Specifically, refer to Figures 14 to 16 The voltage sensing unit 30 is configured to extend in a first direction and be inserted into a valley-shaped structure formed by the upper recess 135 of the battery cell assembly group that connects the top of the first battery cell assembly group 10A and the second battery cell assembly group 10B, and is electrically connected to the busbar 123 provided in the bridging busbar unit 120 of each battery cell assembly group 10.

[0152] The voltage sensing unit 30 can be configured to include a sensing frame 31 and a sensing circuit board 32, such as Figure 14 As shown. The sensing frame 31 is made of insulating material and can be inserted into... Figure 11 In the upper recess 135 of the battery cell assembly 100. Furthermore, as... Figures 15 to 16 As shown, the sensing frame 31 includes sensing holes 31a penetrating in the respective regions where the bridging busbar units 120 of each individual battery cell assembly 100 are located. The curved upper end 123a of the busbar 123 is located below the sensing holes 31a.

[0153] The sensing circuit board 32 can be implemented as a rigid circuit board or a flat flexible printed circuit board, which can be disposed on the sensing frame 31 and can include sensing terminals that can be inserted into the sensing hole 31a.

[0154] Based on the above configuration, as follows Figure 16 As shown, the sensing terminal can pass through the sensing hole 31a to contact the busbar 123 of the bridging busbar unit 120, that is, the curved upper end 123a of the busbar 123, and then can be electrically connected to it.

[0155] The voltage sensing unit 30 can be connected to the battery control system 60 via a signal transmission component (not shown) (e.g., a cable connector or a flexible printed circuit board (FPCB)), and can be configured to send data to and receive data from the BMS via the signal transmission component.

[0156] The crossbeams include a first crossbeam 40, a second crossbeam 50, and a third crossbeam 24. As described above, the crossbeams are components that provide mechanical rigidity for the battery pack tray 21.

[0157] and Figure 13 Similarly, in other embodiments, the first crossbeam 40 can be disposed in the battery pack tray 21 between the first battery cell assembly group 10A and the second battery cell assembly group 10B, extending in a second direction (X-axis direction) intersecting the first direction (Y-axis direction). In the accompanying drawings, the first crossbeam 40 is separate from the base plate 21B of the battery pack tray 21, but can be integrally disposed with the battery pack tray 21 of the first crossbeam 40.

[0158] Additionally, the first crossbeam 40 may have a height similar to that of the busbar frame 121 of the bridging busbar unit 120, and may be configured to have a shape in which the lower center end is recessed upward along the longitudinal direction (X-axis).

[0159] The second crossbeam 50 can be configured to be located on the voltage sensing unit 30 and extend in the first direction, and is fixedly coupled to the two side plates in the ±Y axis direction of the battery pack tray 21. Furthermore, as... Figure 12 As shown, the second crossbeam 50 can be configured to be inserted into the upper recess 135 of the battery cell assembly 100.

[0160] like Figure 13 As shown, the third crossbeam 24 is configured to extend from the base plate 21B of the battery pack tray 21 along a second direction, and its two ends are fixedly coupled to the two ends of the two side plates in the ±Y axis direction. In the crossbeam assembly structure, the size of the second crossbeam 50 is relatively smaller than that of the first crossbeam 40, so that the supporting force of the second crossbeam 50 relative to the battery pack tray 21 is relatively weak. The third crossbeam 24 can be used to reinforce the second crossbeam 50, which has a relatively weak supporting force relative to the battery pack tray 21. As described above, the battery cell assembly 100 includes a recess 136. Therefore, even though the third crossbeam 24 is on the base plate 21B of the battery pack tray 21, the battery cell assembly 10 can be easily mounted on the base plate 21B of the battery pack tray 22 without interfering with the third crossbeam 24.

[0161] Meanwhile, according to one embodiment of this disclosure, the battery control system 60 included in the battery pack can be disposed in a space separated from the battery cell assembly 10 by a partition wall 23. The battery control system 60 may include a battery management system (BMS) and a battery pack disconnect unit (BDU). The BMS can be configured to control the charging / discharging state, power state, performance state, etc., of the pouch cell 110. The BDU controls the electrical connections of the battery cells to manage the power capacity and function of the battery pack 1. For this purpose, the BDU may include power relays, current sensors, fuses, etc.

[0162] As described above, the battery pack 1 according to this disclosure can fill the interior of the battery pack housing 20 with a large number of high-capacity pouch-type battery cells 110 by maximizing the use of the internal space of the battery pack housing 20.

[0163] For example, in Figure 1 In the case of a conventional battery pack 1, the configuration of the module housings used to arrange the battery modules, the gaps between each battery module and the crossbeams, and the complex layout of the cables for the battery modules arranged in a grid structure for electrical connections are all negative factors in increasing the energy density of the battery pack 1. However, the battery pack 1 of this disclosure does not have the negative factors described above.

[0164] Therefore, according to the configuration of this disclosure, the pouch cell 110 can fill the interior of the battery pack housing 20 in a way that saves a lot of space, thereby providing improved energy density for the battery pack 1.

[0165] Figure 17 This is an exploded perspective view showing the main configuration of a battery cell assembly according to another embodiment of the present disclosure. Figure 18This is a perspective view of a battery cell assembly according to another embodiment of the present disclosure. Figure 19 Viewed from the top Figure 18 A diagram of the central area of ​​a single battery cell module. Figure 20 Observing from the bottom Figure 18 A diagram of the central area of ​​a single battery cell assembly.

[0166] Next, we will refer to Figures 17 to 20 A battery cell assembly 400 according to another embodiment of the present disclosure is described. The same reference numerals as in the above embodiments denote the same components; repeated descriptions of the same components will be omitted, and the differences from the above embodiments will be primarily described.

[0167] Compared with the battery cell assembly 100 described above, the battery cell assembly 400 according to another embodiment of the present disclosure differs in the configuration of the battery cell cover and the assembly structure of the battery cell cover and the battery cell, but the other configurations are basically the same.

[0168] According to another embodiment of this disclosure, a battery cell assembly 400 includes a battery cell cover 430, partially surrounding a battery cell comprising a first pouch cell 110A, a bridging busbar unit 120, and a second pouch cell 110B arranged in a row. Specifically, the battery cell cover 430 may be configured to surround the upper and sides of the battery cell, rather than the lower side, such that the lower edges E2 of the first and second pouch cells are exposed to the outside.

[0169] In other words, if the battery cell cover 130 of the above embodiment has a generally U-shaped longitudinal cross-section to expose the upper edge portion E1 of the first pouch battery cell 110A and the second pouch battery cell 110B, then the battery cell cover 430 according to another embodiment of the present disclosure may have a generally n-shaped longitudinal cross-section to expose the lower edge portion E2 of the first pouch battery cell and the second pouch battery cell.

[0170] More specifically, such as Figures 17 to 18 As shown, the battery cell cover 430 may include an upper cover 431, a first side cover 432, and a second side cover 433.

[0171] Here, the top cover 431 can be configured to surround the upper edge E1 of the pouch cell 110. Specifically, the top cover 431 can be configured to contact or be spaced apart from the upper edge E1 of the pouch cell 110. Furthermore, the top cover 431 can be configured to be planar. In this case, the top cover 431 can have a cross-section formed in a linear shape in the horizontal direction, thereby allowing it to surround the upper edge E1 of the pouch cell 110 in a linear shape from the outside.

[0172] The first side cover 432 can be configured to extend downward from one end of the upper cover 431. For example, the first side cover 432 can be configured to extend downward (in the -Z axis direction in the figure) from the left end of the upper cover 431. Furthermore, the first side cover 432 can be configured in a planar shape. In this case, the first side cover 432 can be configured in a curved form within the upper cover 431.

[0173] Additionally, the first side cover 432 can be configured to surround the outer side of the receiving portion R on one side of the first pouch cell 110A and the second pouch cell 110B housed therein.

[0174] The second side cover 433 can be configured to be horizontally spaced from the first side cover 432. Furthermore, the second side cover 433 can be configured to extend downwards from the other end of the upper cover 431. For example, the second side cover 433 can be configured to extend downwards from the right end of the upper cover 431. Additionally, the second side cover 433 can also be configured with a planar shape similar to the first side cover 432. In this case, the second side cover 433 and the first side cover 432 can be arranged parallel to each other while being horizontally spaced.

[0175] Additionally, the second side cover 433 can be configured to surround the outer side of the receiving portion R on the other side of the pouch cell 110 housed therein. In the above embodiment, the battery cell cover 430 may have an internal space defined by the top cover 431, the first side cover 432, and the second side cover 433. Furthermore, as described above, the battery cell cover 430 can accommodate one or more pouch cells 110 within a limited internal space.

[0176] In addition, the cross-sectional area of ​​the first side cover 432 and the second side cover 433 is larger than the cross-sectional area of ​​the soft-pack battery cell 110 facing the first side cover 432 and the second side cover 433, thereby preventing the housing portion R from being exposed to the outside, thus ensuring safety as much as possible.

[0177] Specifically, the pouch cell 110 may include sealed and unsealed portions as edge portions E1 to E4. For example, in Figure 17 In one embodiment, the upper edge portion E1 may be the DSF (double-sided folding) portion, which serves as the sealing portion of the pouch cell 110, and the lower edge portion E2 may be the unsealed portion of the pouch cell 110.

[0178] The battery cell cover 430 can be configured to surround the pouch cell 110 such that at least a portion of the sealed portion is surrounded at the edges E1 to E4, while at least a portion of the unsealed portion is not surrounded and is exposed to the outside. For example, refer to... Figure 17In one embodiment, the battery cell cover 430 can be configured to cover the upper edge E1, which is part of the sealing portion of the pouch cell 110. In this case, the pouch cell 110 housed in the battery cell cover 430 can be considered to be configured such that the upper edge E1, which is the sealing portion, faces the upper cover 431. Furthermore, the battery cell cover 430 can surround the pouch cell 110, such that the lower edge E2, which is the unsealed portion of the pouch cell 110, is exposed to the outside. In this case, the lower edge E2, which is the unsealed portion of the pouch cell 110, can be considered to be located at the opening surface of the cell cover 430.

[0179] For reference, in the pouch cell 110, the upper edge E1, which is a sealed portion, is more susceptible to the effects of relatively high-temperature gas or flame discharge than the lower edge E2, which is a non-sealed portion. However, according to this embodiment, when the upper edge E1, which is a sealed portion, is positioned to face the top cover 431 and discharges exhaust gas from the sealed portion, it is more advantageous to prevent the exhaust gas from moving upward and causing directional discharge that moves horizontally and / or downward.

[0180] Furthermore, in the pouch cell 110, the lower edge portion E2, which is a non-sealed portion, can have a planar shape with a relatively wider cross-sectional area than the upper edge portion E1, which is a sealed portion. Therefore, the lower edge portion E2 can be provided at the opening surface of the cell cover 430 and directly contact the thermal resin G1, which will be described later, thereby improving cooling efficiency.

[0181] Additionally, according to another embodiment of this disclosure, the battery cell cover 430 may include recesses 435 and 436, which are configured to be partially cut inward in at least one of the upper and lower ends of the location receiving the bridging busbar unit 120.

[0182] For example, such as Figure 17 As circled in the middle, the battery cell cover 430 may include an upper recess 435 and a lower recess 436 at two positions, the upper end and the lower end of the center.

[0183] Additionally, refer to Figures 19 to 20 In the bridging busbar unit 120, the upper surface portion of the busbar frame 121 is lower than the upper edge E1 of the first pouch cell 110A and the second pouch cell 110B. Therefore, when the bridging busbar unit 120 is housed in the cell cover 430, the upper surface portion of the busbar frame 121 can be configured not to protrude above the upper recess 435, and the lower surface portion of the busbar frame 121 can be configured not to protrude below the lower recess 436. Therefore, the cell assembly 400 according to this embodiment can be provided in a form where the central region where the bridging busbar unit 120 is located is recessed inward.

[0184] Furthermore, unlike the upper recess 135 of the battery cell cover 130 described above, the upper recess 435 of the battery cell cover 430 according to this embodiment can be configured such that only the curved upper end 123a of the busbar 123 is exposed in the upward direction, and is blocked by shielding plates 435a and 435b in the direction toward the first pouch battery cell 110A (-X direction) and the direction toward the second pouch battery cell 110B (+X direction), as shown. Figure 19 As shown. Here, shielding plates 435a and 435b can be configured such that their lower ends are fitted into the upper surface of the busbar frame 121.

[0185] With this configuration, the internal space of the battery cell cover 430 can be physically separated from the left and right spaces relative to the bridging busbar unit 120, thereby improving airtightness. Therefore, when assembling a battery pack using the battery cell assembly 400, the battery cell assembly 400 can be configured such that the opening surface of the battery cell cover 430 faces the bottom plate 21B of the battery pack tray 21, thus sealing the opening surface of the battery cell cover 430. In this case, in the event of a thermal accident, since the movement of ignition sources such as gas, heat, and sparks between the first pouch cell 110A and the second pouch cell 110B housed in the battery cell cover 430 is restricted, the propagation of thermal runaway between the first pouch cell 110A and the second pouch cell 110B can be blocked or delayed.

[0186] Meanwhile, according to another embodiment of this disclosure, multiple battery cell assemblies 400 can be stacked in one direction to form a battery cell assembly group 11, such as... Figures 21 to 22 As shown. In this case, the battery cell assembly 11 may have a valley-shaped structure at the region where the upper recess 435 and the lower recess 436 are connected in one direction (±Y direction). Figures 23 to 24 As shown, when assembling the battery pack 2, the space in the battery cell assembly 400 in such a valley-shaped structure can be used as the mounting space for the voltage sensing unit 30, the second crossbeam 50, and the third crossbeam 24.

[0187] For example, such as Figure 23 and Figure 24 As shown, the multiple battery cell assembly groups 11 can be referred to as components of the battery cell assembly 400 described above, and can be housed in the battery pack housing 20. In this embodiment, the multiple battery cell assembly groups 11 can be divided into a first battery cell assembly group 11A and a second battery cell assembly group 11B. It can be seen that dividing the multiple battery cell assembly groups 11 into a first battery cell assembly group 11A and a second battery cell assembly group 11B is for ease of differentiation based on... Figures 23 to 24The first crossbeam 40 of the battery pack tray 21 contains battery cell assembly groups located in the +Y axis direction and battery cell assembly groups located in the -Y axis direction.

[0188] Figure 25 This is a diagram schematically illustrating the cooling configuration of a battery pack according to another embodiment of the present disclosure.

[0189] According to another embodiment of the present disclosure, the battery pack housing 20 of the battery pack can be configured to include a heat sink. Here, a heat sink refers to an object that absorbs and radiates heat from other objects through direct or indirect thermal contact. The battery pack housing 20 itself can serve as a heat sink, or it can be configured to have a heat sink with a flow path F1 for cooling water to flow through, either internally or externally.

[0190] In this embodiment, the heat sink may include an upper heat sink 520 and a lower heat sink 510, and as follows: Figure 25 As shown, the upper heat sink 520 can be installed in the battery pack cover 22, and the lower heat sink 510 can be installed in the battery pack tray 21.

[0191] Additionally, the battery cell cover 430 can be configured to be mounted on the base plate 21B of the battery pack tray 21 in such a way that the lower ends of the first side cover 432 and the second side cover 433 are fitted into the lower heat sink 510. For example, as Figure 25 As shown in “K1”, the lower end of each battery cell cover 430 can be partially fitted into the lower heat sink 510 for fastening and fixing, and the upper heat sink 520 and upper cover 431 of the battery cell cover 430 can be arranged facing each other.

[0192] Additionally, thermal resins G1 and G2 can be respectively disposed in the lower edge E2 and upper edge E1 of the pouch cell 11O inside the battery cell cover 430. Furthermore, thermal resin G3 can be disposed from the outside of the battery cell cover 430 between the upper cover 431 and the upper heat sink 520.

[0193] According to the above configuration, the heat generated from each battery cell assembly 400 can not only be... Figure 25 As indicated by "H1" in the diagram, the radiation extends to the lower edge E2 of the pouch cell 110 -> thermal resin G1 -> lower heat sink 510, and can also be as follows: Figure 25 As indicated by "H2", the heat is radiated to the upper edge E1 of the pouch cell 110 → thermal resin G2 → upper cover 431 of the cell cover 430 → thermal resin G3 → upper heat sink 520. As described above, the battery pack of this disclosure can be dual-cooled, with the heat from the pouch cell 110 being conducted to the lower heat sink 510 and the upper heat sink 520 for cooling.

[0194] In particular, compared with battery packs that include conventional battery modules, the battery pack of this disclosure has a configuration in which the lower edge E2 of the pouch cell directly faces the lower heat sink 510 and the cell cover 430 is located on the lower heat sink 510. Therefore, there are no contact thermal resistance elements (e.g., the module housing of the battery module) between the heat sinks in the pouch cell, and the heat conduction distance is short, thereby further improving the cooling performance.

[0195] In addition, since the battery cell cover 430, the soft-pack battery cell 110 inside the battery cell cover 430 and the battery pack housing 20 are fixed to each other by thermosetting resin G1, G2 and G3, the battery cell assembly 400 can be stably assembled and fixed to the battery pack housing 20 without using fasteners such as bolts and rivets.

[0196] Figure 26 This is a diagram illustrating a modified example of the cell cover in a battery pack according to another embodiment of the present disclosure. Figure 27 This is a diagram illustrating a modified example of a battery pack tray in a battery pack according to another embodiment of the present disclosure.

[0197] Figure 26 and Figure 27 These are perspective views schematically illustrating the configuration of the battery cell cover 600 and the battery pack tray 21 according to another embodiment of this disclosure. Detailed descriptions of parts that are the same as or similar to those in the above embodiments will be omitted, and the differences will be described primarily.

[0198] Similar to the above embodiments, the battery cell cover 600 according to the modified example includes: an upper cover 631, a first side cover 632, a second side cover 633, an upper recess 635, and a lower recess 636. Furthermore, as... Figure 26 As shown, the battery cell cover 600 also includes a protrusion 601 located at the lower end of at least one of the first side cover 632 and the second side cover 633. The protrusion 601 may be configured to extend relatively long in a downward direction from the lower end of the battery cell cover 600.

[0199] Protrusion 601 can be set to multiple. For example, such as Figure 26 As shown, a plurality of protrusions 601, for example, six protrusions 601, may be provided along the longitudinal direction of the battery cell cover 600 at the lower end of the first side cover 632 and / or the second side cover 633.

[0200] In an embodiment of the battery cell cover 600 configured as described above, the battery pack tray 21 may have a mating groove 21Ba, which is configured to allow the protrusion 601 to be inserted, such as... Figure 27 As shown. Here, the groove 21Ba can be formed in a position and shape corresponding to the protrusion 601. For example, refer to Figure 27In one embodiment, the mating groove 21Ba can be formed at the bottom plate 21B of the battery pack tray on which the battery cell cover 600 is disposed, in a position and shape corresponding to the protrusion 601 of the battery cell cover 600. Furthermore, one or more protrusions 601 can be fitted into a mating groove 21Ba. For example, two protrusions 601 can be inserted into the central portion, such as... Figure 25 The mating groove 21Ba is located in the portion indicated by "K1". On the other hand, in the battery pack tray 21, a protrusion 601 can be inserted into the mating groove 21Ba located at the outermost point in the stacking direction of the battery cell cover 600. For example, in... Figure 27 In the configuration, a protrusion 601 can be inserted into the leftmost and rightmost of the multiple mating grooves 21Ba arranged in the left-right direction.

[0201] According to this embodiment of the present disclosure, the connection between the battery cell cover 600 and the battery pack tray 21 can be further improved. Therefore, even if vibration or impact is applied to the battery pack or expansion occurs at the pouch cell 110, the stacked state of the battery cell cover 600 and the pouch cell 110 housed therein can be stably maintained. Furthermore, according to this embodiment, movement of the battery cell cover 600 in the front-to-back direction (X-axis direction) can be prevented. Additionally, according to this embodiment, movement of the battery cell cover 600 in the left-to-right direction (Y-axis direction) can be prevented, and separation of the first side cover 632 and the second side cover 633 can be effectively prevented.

[0202] Figure 28 This is a diagram showing an end region of a battery cell assembly group in a battery pack according to another embodiment of the present disclosure, viewed from the bottom. Figure 29 This is a schematic diagram illustrating the exhaust configuration of a battery pack according to another embodiment of the present disclosure.

[0203] Next, when a thermal accident occurs in a battery pack according to another embodiment of this disclosure, reference will be made to... Figure 28 and Figure 29 Describes the directional exhaust configuration of gases, flames / sparks, etc.

[0204] According to this embodiment, the battery cell assembly 400 includes a directional venting space VS inside the battery cell cover 430. The directional venting space VS may be longitudinally disposed at one or both ends of the battery cell cover 430.

[0205] In the case of the pouch cell 110, the sealing portion of the lead electrode 111, i.e., the front edge portion E3 or the rear edge portion E4, is relatively thinner than the receiving portion R. Therefore, there is remaining space in the front (rear) portion of the cell cover surrounding the front edge portion E3 or the rear edge portion E4. This remaining space inside the cell cover can be used as a directional venting space VS. Figure 28 As shown, the battery cell cover 430 of each battery cell assembly 400 can be partially fitted to the external busbar frame 201, leaving a directional venting space VS, as indicated by "D1" in the figure. In this case, the directional venting space VS can have a closed structure except in one direction.

[0206] Meanwhile, as described above, in the battery cell assembly 400 according to this embodiment, thermal resins G1, G2, and G3 are applied to the upper edge portion E1 and the lower edge portion E2 of the pouch cell for cooling and fixing the pouch cell 110. At this time, as... Figure 28 As shown, specifically, the thermal resin G1 applied to the opening surface of the battery cell cover 430 is applied only before the directional venting space VS. That is, in the battery cell assembly 400 according to this embodiment, thermal resins G1, G2, and G3 are applied only to the upper and / or lower portions of the receiving portion R of the pouch-type battery cell 110, and thermal resin G1 is not applied to the front edge portion E3 and / or the rear edge portion E4 of the sealing portion that serves as the lead electrode lead 111.

[0207] Therefore, in the directional exhaust space VS according to this embodiment, the upward direction (Z direction) is blocked by the upper cover 431 of the battery cell cover 430, and the front-back and left-right directions (±X and ±Y directions) are blocked by at least one of the external busbar frame 201, the receiving portion R of the pouch battery cell 110, and the first side cover 432 and the second side cover 433 of the cell cover 430. On the other hand, the downward direction (-Z direction) of the directional exhaust space VS can communicate with the outside.

[0208] Based on such a configuration, such as Figure 29 As shown, when a thermal accident occurs and gas or flame / spark (such as metal sheets detached from the electrode assembly) is emitted from the pouch cell 110, the upper cover 431 of the cell cover 430 can prevent the gas or flame / spark from moving upwards. Furthermore, the external busbar frame 201, the first side cover 432, and the second side cover 433 of the cell cover 430 can prevent the gas or flame / spark from moving in the front-back and left-right directions. Therefore, as... Figure 29 As shown, the flow of gas or flame / spark can be directed downwards in the directional exhaust space VS.

[0209] Additionally, the battery pack housing 20 may include an exhaust port 25 communicating with a directional exhaust space VS. For example, the exhaust port 25 may be disposed in the base plate 21B, corresponding to the lower vertical portion of the directional exhaust space VS in the battery pack tray 21. Furthermore, a rupture disc 27 that ruptures under predetermined pressure or heat may be installed in the exhaust port 25. The rupture disc 27 may be formed of a material that burns at or above a predetermined gas pressure or temperature, such as a thin aluminum film structure or a plastic resin structure. For reference, in this embodiment, the exhaust port 25 is configured to penetrate the base plate 21B of the battery pack tray 21 in the vertical direction; however, unlike this embodiment, the exhaust port 25 is configured as a channel disposed inside the battery pack tray 21, and the channel may be configured as an opening (not shown) extending to one side of the battery pack housing 20.

[0210] Based on the directional venting structure and the battery pack housing structure of the battery cell assembly, when gas is generated in a specific battery cell assembly 400 included in the battery pack, the gas in the battery cell assembly 400 does not propagate to other adjacent battery cell assemblies 400, but can be discharged downwards along the battery pack tray 21 where the corresponding battery cell assembly 400 is located. Therefore, the battery pack according to this disclosure has the effect of suppressing or significantly delaying the propagation of thermal runaway of the pouch cell 110 in the event of a thermal accident.

[0211] As described above, according to this disclosure, by using a bridging busbar unit to longitudinally connect one or more pouch cells and another one or more pouch cells, a battery cell assembly implemented as an integrated long battery cell can be provided. Furthermore, by using such a battery cell assembly to directly assemble pouch cells into the battery pack housing, the space utilization of the battery pack can be maximized and the energy density significantly improved.

[0212] In addition to the above description, according to one embodiment of this disclosure, battery pack safety can be improved by improving the cooling efficiency of the battery pack and controlling the exhaust direction of gas or flame emitted from the pouch cell.

[0213] Furthermore, the battery pack according to this disclosure can be used as a power source for a vehicle. That is, a vehicle (not shown) according to this disclosure may include the battery pack 1 as described above. Here, for example, a vehicle (not shown) according to this disclosure may include a predetermined vehicle (not shown) that uses electricity as a drive source, such as an electric vehicle or a hybrid vehicle. In addition to the battery pack according to this disclosure, a vehicle according to this disclosure may also include various other components incorporated in the vehicle, such as a body, engine, etc.

[0214] Although directional terms such as “up,” “down,” “left,” “right,” “front,” and “back” are used in this specification, these terms are merely for ease of description and it will be apparent to those skilled in the art that these terms may vary depending on the position of the target object or the observer’s position.

[0215] This disclosure has been described in detail. However, it should be understood that the detailed description and specific examples indicating preferred embodiments of this disclosure are given for illustrative purposes only, as those skilled in the art will clearly understand from the detailed description the various changes and modifications within the scope of this disclosure.

Claims

1. A battery cell assembly, comprising: Multiple battery cell groups are arranged in a row, and each of the multiple battery cell groups has one pouch cell or at least two pouch cells stacked on top of each other. A bridging busbar unit is disposed between the plurality of battery cell groups and electrically connected to the plurality of battery cell groups; as well as The battery cell cover accommodates the plurality of battery cell groups and the bridging busbar unit, and supports the pouch-type battery cells of the plurality of battery cell groups. The battery cell cover includes a recess that is configured to be partially cut out in an inward direction in at least one of the upper and lower sides of the central region where the bridging busbar unit is located.

2. The battery cell assembly according to claim 1, wherein, The plurality of battery cell packs include: The first battery cell group includes one or more first pouch-type battery cells; and The second battery cell assembly includes one or more second pouch-type battery cells. The first battery cell group, the bridging busbar unit, and the second battery cell group are arranged in a row.

3. The battery cell assembly according to claim 2, wherein, The battery cell cover is configured to support the first pouch cell and the second pouch cell in an upright position.

4. The battery cell assembly according to claim 2, wherein, The battery cell cover partially surrounds the first pouch battery cell and the second pouch battery cell, exposing the upper or lower sides of the first pouch battery cell and the second pouch battery cell.

5. The battery cell assembly according to claim 2, wherein, Each of the first and second pouch cell includes: a receiving portion accommodating an electrode assembly; and an edge portion surrounding the receiving portion. The battery cell cover is configured to cover either the upper edge or the lower edge of the first pouch cell and the second pouch cell, as well as the receiving portion.

6. The battery cell assembly according to claim 5, wherein, The battery cell cover includes: The lower cover is configured to surround the lower edges of the first pouch cell and the second pouch cell; A first side cover is configured to extend upward from one end of the lower cover and surround the outer side of the receiving portion on one side of the first pouch cell and the second pouch cell; and The second side cover is configured to extend in the upward direction from the other end of the lower cover at a position spaced apart from the first side cover, and surrounds the outer side of the receiving portion on the other side of the first pouch cell and the second pouch cell.

7. The battery cell assembly according to claim 5, wherein, The battery cell cover includes: The top cover is configured to surround the upper edges of the first pouch cell and the second pouch cell; A first side cover is configured to extend downward from one end of the upper cover and surround the outer side of the receiving portion on one side of the first pouch cell and the second pouch cell; and The second side cover is configured to extend in the downward direction from the other end of the top cover at a position spaced apart from the first side cover, and surrounds the outside of the receiving portion on the other side of the first pouch cell and the second pouch cell.

8. The battery cell assembly according to claim 5, wherein, The first and second pouch-type battery cells include a sealed portion and a non-sealed portion serving as the edge portion, and The battery cell cover is configured to surround at least a portion of the sealing portion relative to the first pouch cell and the second pouch cell, thereby exposing the unsealed portion.

9. The battery cell assembly according to claim 2, wherein, The battery cell cover is configured to have a length corresponding to the length of the first pouch cell, the bridging busbar unit, and the second pouch cell arranged in a row in sequence.

10. The battery cell assembly according to claim 2, wherein, The first and second pouch cell are bidirectional pouch cells with electrode leads protruding in two directions.

11. The battery cell assembly according to claim 2, wherein, In the first pouch cell, an electrode lead with a first polarity is connected to the bridging busbar unit, and In the second pouch cell, an electrode lead with a second polarity is connected to the bridging busbar unit.

12. The battery cell assembly according to claim 2, wherein, The bridging busbar unit includes: Busbar frame, made of electrically insulating material and configured as a hollow column; and The busbar is partially inserted into the busbar frame and is made of conductive material. The electrode leads of the first and second pouch cell are fixedly in contact with one and another surface of the busbar inside the busbar frame, respectively.

13. The battery cell assembly according to claim 12, wherein, The busbar frame includes: At least one slot through which the electrode leads of the first or second pouch cell are inserted into a side portion and an opposite side portion, respectively; and An insertion hole is configured to insert the busbar into the upper surface of the busbar frame in a vertical direction.

14. The battery cell assembly according to claim 13, wherein, The busbar frame includes: An opening for welding on the side without the slot.

15. The battery cell assembly according to claim 13, wherein, The manifold includes a curved upper end, which is exposed outside the insertion hole.

16. The battery cell assembly according to claim 12, wherein, The busbar frame is configured such that its upper surface is located at a height lower than the upper ends of the first pouch cell and the second pouch cell.

17. A battery pack, comprising: A battery cell assembly group comprising a plurality of battery cell assemblies according to any one of claims 2 to 16 stacked respectively in a first direction; A battery pack housing includes a battery pack tray on which the battery cell assembly is disposed, and a battery pack cover combined with the battery pack tray and covering the battery cell assembly; as well as A voltage sensing unit extends in the first direction, is disposed on the top of the battery cell assembly group, and is electrically connected to a busbar disposed in the bridging busbar unit of each battery cell assembly group.

18. The battery pack according to claim 17, wherein, The battery cell assembly is fixedly attached to the upper surface of the battery pack tray.

19. The battery pack according to claim 17, wherein, The voltage sensing unit: Made of insulating material and disposed on top of the bridging busbar unit; Includes a sensing frame having sensing holes that penetrate the respective areas where the bridging busbar unit is located; and The sensing circuit board is mounted on top of the sensing frame. Each sensing terminal disposed on the sensing circuit board passes through the sensing hole to be electrically connected to the busbar disposed in the bridging busbar unit.

20. The battery pack according to claim 17, wherein, The battery cell assembly group includes a first battery cell assembly group and a second battery cell assembly group, and The battery cell assembly includes a first crossbeam that extends between the first battery cell assembly and the second battery cell assembly in a second direction intersecting the first direction and is fixedly connected to the battery pack tray.

21. The battery pack of claim 17, wherein the battery pack includes a second crossbeam disposed on top of the voltage sensing unit, extending in the first direction, and fixedly coupled to the battery pack tray.

22. The battery pack according to claim 17, wherein, The battery pack housing includes a heat sink, and A thermal resin is disposed between the first and second pouch cell and the heat sink.

23. The battery pack according to claim 22, wherein, The heat sink includes an upper heat sink and a lower heat sink respectively disposed on the upper and lower parts of the battery cell cover.

24. The battery pack according to claim 17, wherein, The battery cell cover is configured such that at least one end of it is fitted into the battery pack housing.

25. The battery pack according to claim 17, wherein, The battery cell assembly includes: A directional exhaust space through which gas moves in an upward or downward direction from at least one end of the battery cell cover in the longitudinal direction inside the directional exhaust space.

26. The battery pack according to claim 25, wherein, The battery pack housing includes an exhaust port that communicates with the directional exhaust space.

27. The battery pack according to claim 26, wherein, A rupture disc is installed in the exhaust port, which is designed to rupture under predetermined pressure or heat.

28. A vehicle comprising the battery pack according to claim 17.

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