Battery pack case, battery pack, and battery device including same

Abstract

A battery pack according to various embodiments comprises: a cell assembly including a plurality of battery cells; and a battery pack case that accommodates the cell assembly, wherein the battery pack case includes: a lower frame; and a plurality of side frames extending from the lower frame in a substantially vertical direction, and the plurality of side frames may be configured as a combination of: a first side frame including a first flange and a second flange respectively protruding from the upper portion and the lower portion thereof toward the outside of the battery pack case; and a second side frame having one corner at least partially in contact with the first side frame and including a third flange protruding from the upper portion thereof toward the outside of the battery pack case. Other embodiments are possible.

Description

Battery pack case, battery pack, and battery device including the same

[0001] The present invention relates to a battery pack case having a laminated bonding structure and a battery device including the same.

[0002] Secondary batteries, capable of being recharged and discharged, are widely used in mobile devices such as digital cameras, cell phones, and laptops. Recently, they have been attracting attention as an energy source for electric vehicles and energy storage systems (ESS).

[0003] As large-capacity and high-output power is required in electric vehicles and power storage devices, battery modules that house multiple secondary batteries (battery cells) inside a housing or large-capacity battery devices that connect multiple battery packs are widely used.

[0004] In particular, for large vehicles such as commercial vehicles, battery devices with multiple battery packs connected have been applied as large-capacity energy sources are required to drive the vehicles over long distances.

[0005] In the case of an example battery device applied to a large vehicle such as this, a method may be applied in which multiple battery packs are each fixed to a vehicle and electrically connected to each other to form the entire battery device.

[0006] However, in the case of conventional technologies, a complex and irregularly shaped fixing device was required to fix each battery pack, and there may be a problem in that a gap is created between the battery packs, which reduces the energy density per unit volume of the battery device.

[0007] Various embodiments of the present disclosure have been devised to improve such conventional problems, and to propose a structure that can maximize energy density by reducing wasted space in a battery device composed of one or more battery packs, and can quickly and stably stack and combine multiple battery packs.

[0008] The technical tasks to be achieved by this embodiment are not limited to the technical tasks described above, and other technical tasks can be inferred from the following embodiments.

[0009] A battery pack according to various embodiments includes a cell assembly including a plurality of battery cells and a battery pack case accommodating the cell assembly, wherein the battery pack case includes a lower frame and a plurality of side frames extending in a substantially vertical direction from the lower frame, and the plurality of side frames may be configured as a combination of a first side frame including a first flange and a second flange protruding toward the outside of the battery pack case at an upper and a lower portion, respectively, and a second side frame including a third flange configured such that one edge at least partially contacts the first side frame and protrudes toward the outside of the battery pack case at an upper portion.

[0010] A battery pack case according to various embodiments is configured to accommodate a cell assembly including a plurality of battery cells, and includes a lower frame; and a plurality of side frames connected in a vertical direction from the lower frame, wherein the plurality of side frames may include a first side frame including a first flange and a second flange respectively protruding toward the outside of the battery pack case at an upper and a lower portion; and a second side frame including a third flange configured such that one edge is at least partially in contact with the first side frame and protruding toward the outside of the battery pack case at an upper portion.

[0011] Various embodiments of the present disclosure can provide a battery device having a structure in which a plurality of battery packs can be stacked and connected, thereby minimizing wasted space in the battery device, efficiently arranging components necessary for use of the battery device, and maximizing energy density.

[0012] In addition, a battery device capable of quickly and easily stacking and connecting multiple battery packs while ensuring structural stability can be provided.

[0013] In addition, by cooling the cell assembly using the lower frame of the battery pack case that can be stacked, not only can parts be saved, but a cooling effect can also be obtained for the cell assembly of another adjacent battery pack (e.g., a battery pack stacked on the lower side).

[0014] The effects of the invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0015] FIG. 1 is a schematic perspective view of a battery device according to one embodiment of the present disclosure.

[0016] FIG. 2 is a schematic exploded perspective view of a battery device according to one embodiment of the present disclosure.

[0017] FIG. 3 is a schematic exploded perspective view of a battery pack according to one embodiment of the present disclosure.

[0018] FIG. 4 is a schematic exploded perspective view of a lower frame of a battery pack case according to one embodiment of the present disclosure.

[0019] FIGS. 5A to 5C are partial cross-sectional views of a battery pack case according to various embodiments of the present disclosure.

[0020] FIGS. 6A and 6B are partial cross-sectional views of a battery pack case according to one embodiment of the present disclosure.

[0021] FIG. 7 is a drawing for explaining a vehicle including a battery pack or battery device according to one embodiment of the present disclosure.

[0022] Before going into the detailed description of the present invention, it should be noted that the terms and words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted with meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain his own invention in the best way. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of ​​the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of this application.

[0023] The same reference numbers or symbols used in each drawing attached to this specification represent parts or components that perform substantially the same functions. For convenience of explanation and understanding, the same reference numbers or symbols may be used in different embodiments. In other words, even if components with the same reference numbers are depicted in multiple drawings, they do not necessarily represent a single embodiment.

[0024] In the following description, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "comprises" or "comprises" should be understood to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0025] In addition, in the description below, expressions such as top, upper, lower, lower, side, front, and rear are expressed based on the direction shown in the drawing, and it is noted in advance that they may be expressed differently if the direction of the object in question changes.

[0026] Additionally, terms including ordinal numbers, such as "first," "second," etc., may be used in this specification and claims to distinguish between components. These ordinal numbers are used to distinguish identical or similar components from each other, and the use of these ordinal numbers should not be interpreted in a limited manner. For example, components associated with these ordinals should not be interpreted in a restricted manner, such as in the order of use or arrangement, based on their numbers. If necessary, each ordinal number may be used interchangeably.

[0027] Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. However, the spirit of the present invention is not limited to the presented embodiments. For example, those skilled in the art who understand the spirit of the present invention may propose other embodiments within the spirit of the present invention by adding, modifying, or deleting components, etc., but such embodiments will also be considered to be within the spirit of the present invention. The shapes and sizes of elements in the drawings may be exaggerated for clarity.

[0028] Fig. 1 is a schematic perspective view of a battery device (1) according to one embodiment of the present disclosure. Fig. 2 is a schematic exploded perspective view of a battery device (1) according to one embodiment of the present disclosure.

[0029] Referring to FIGS. 1 and 2, a battery device (1) according to various embodiments may include at least one battery pack (10) that may be laminated and combined along one direction (e.g., the Z-axis direction).

[0030] Each battery pack (10) may include a cell assembly (200) including a plurality of battery cells and a pack case (100) that accommodates the cell assembly (200).

[0031] In various embodiments of the present disclosure, each battery pack (10) constituting the battery device (1) may have the same structure and shape. For example, a user (or manufacturer) can easily determine the number of battery packs (10) to be applied to the device in accordance with the power amount or size required for each device, and implement the entire battery device (1) by stacking and combining an appropriate number of battery packs (10).

[0032] For example, as illustrated in FIG. 1, a plurality of battery packs (10) may include a first battery pack (10a) and a second battery pack (10b) that are laminated and connected along one direction (e.g., the Z direction). In this case, the first battery pack (10a) and the second battery pack (10b) may have the same structure.

[0033] Meanwhile, unlike those illustrated in FIGS. 1 and 2, the battery device (1) according to various embodiments of the present disclosure may be configured with three or more battery packs (10) stacked in one direction, or may be configured with only a single battery pack (10). However, even in this case, each battery pack (10) may have a stackable structure according to the needs of the user.

[0034] For example, in each battery pack (10) constituting the battery device (1), the battery pack case (100) may have a structure with an open upper portion.

[0035] For example, the open upper portion of one battery pack (10) (e.g., the second battery pack (10b) of FIGS. 1 and 2) may be covered by one side (e.g., the lower frame) of the battery pack case (100) of another battery pack (10) (e.g., the first battery pack (10a) of FIGS. 1 and 2) laminated and bonded thereto.

[0036] Meanwhile, in the case where there is no other battery pack (10) stacked on the upper side of the battery pack (10), i.e., in the case of the uppermost battery pack (10), the open upper part may be covered by a separate member, for example, an upper cover (20).

[0037] For example, the second pack case (100b) of the second battery pack (10b) may be provided with a structure in which the internal space is opened upwards without a separate cover member covering the internal space. The internal space of the second pack case (100b) opened upwards in this way may be closed by the first pack case (100a) of the first battery pack (10a) stacked on top of the second battery pack (10b). That is, when the first pack case (100a) is stacked on the upper side of the second pack case (100b), the lower surface of the first pack case (100a) may be in close contact with the upper part of the second pack case (100b), thereby closing the internal space of the second pack case (100b).

[0038] In this way, when a plurality of battery packs (10) are stacked and connected, a battery pack (10) closes the internal space of the battery pack (10) positioned below it, so that a separate cover member for battery packs (10) other than the uppermost battery pack (10) can be omitted.

[0039] In various embodiments of the present disclosure, the structure of the battery device (1) can be further simplified through such a stacked structure, and a plurality of battery packs (10) can be closely coupled to maximize the overall energy density of the battery device (1).

[0040] Hereinafter, with reference to FIGS. 3 and 4, a battery pack (10) constituting a battery device (1) according to embodiments will be described in detail.

[0041] Fig. 3 is a schematic exploded perspective view of a battery pack (10) according to one embodiment of the present disclosure. Fig. 4 is a schematic exploded perspective view showing each plate constituting the lower frame (110) of a battery pack case (100) according to one embodiment of the present disclosure.

[0042] For example, the lower frame (110) of the battery pack (10) and the battery pack case (100) of FIGS. 3 and 4 can be understood as a part of the components constituting the battery device (1) illustrated in FIGS. 1 and 2, respectively.

[0043] According to various embodiments, the battery pack (10) may include a cell assembly (200) and a battery pack case (100) that accommodates at least one cell assembly (200) in an inner space.

[0044] The cell assembly (200) may include a battery cell stack (or battery cell unit) (210) composed of a plurality of battery cells (211). For example, the battery cells (211) may be stacked along one direction (e.g., the Y-axis direction of FIG. 3) to form the battery cell stack (210). Meanwhile, the cell assembly (200) may further include a busbar assembly (220) that electrically connects each of the battery cells (211).

[0045] In one embodiment, each battery cell (211) may include a pouch-type secondary battery having a structure in which an electrode assembly is housed inside a pouch. In this case, the electrode assembly and the electrolyte may be housed inside a pouch formed by forming one or more outer materials. However, each battery cell (211) that may be included in the cell assembly (200) according to various embodiments is not limited to a pouch-type secondary battery. For example, the battery cell (211) according to various embodiments may be configured as a square secondary battery or a cylindrical secondary battery to form the cell assembly (200).

[0046] Meanwhile, the cell stack (210) may include a protective member for protecting the plurality of battery cells (211). For example, the protective member may include a pressure pad that can apply a predetermined pressure to the battery cells (211) to minimize problems caused by swelling during the charging and discharging process of each battery cell (211). As another example, the protective member may include an insulating sheet to block high-temperature heat energy or flame generated from a specific battery cell (211) from being transferred to other neighboring components.

[0047] The busbar assembly (220) may include a plurality of conductive busbars electrically connected to the battery cells (211) and a busbar frame supporting the conductive busbars. The busbar assembly (220) may face at least one side of the cell stack (210). For example, as illustrated in FIG. 3, the busbar assembly (220) may be provided in pairs and arranged such that each of the busbar assemblies faces the cell stack (210) in the longitudinal direction of the battery cells (211) (e.g., the X-axis direction of FIG. 3).

[0048] Meanwhile, in various embodiments, the cell assembly (200) may further include an insulating cover disposed between the busbar assembly (220) and the pack case (100). For example, the insulating cover may serve to protect the busbar assembly (220) and prevent a short circuit that may occur between the busbar and the pack case (100).

[0049] The battery pack (10) according to various embodiments of the present disclosure may have a so-called CTP (cell to pack) type structure in which each cell assembly (200) can be directly accommodated in the pack case (100) without a separate module case surrounding the cell assembly (200). In this case, since the module case is eliminated, losses due to space and assembly tolerances occupied by the conventional module case are minimized, and accordingly, a larger number of battery cells can be mounted or battery cells of a larger size can be arranged, thereby obtaining the effect of increasing the energy density of the battery pack (10).

[0050] The battery pack case (100) can accommodate one or more cell assemblies (200) in its internal space. For example, the battery pack case (100) can include a lower frame (110) on which at least one cell assembly (200) is mounted, and a plurality of side frames (e.g., a first side frame (120) and a second side frame (130)) that are coupled to the lower frame (110) to form side surfaces of the pack case (100).

[0051] Hereinafter, a battery pack case (100) according to various embodiments of the present disclosure will be described in detail with reference to FIGS. 3 and 4, as well as FIGS. 5A to 6B.

[0052] FIGS. 5A to 6B are partial cross-sectional views of a battery pack case (100) according to various embodiments of the present disclosure, respectively. Specifically, FIGS. 5A to 5C are schematic side cross-sectional views of the first side frame (120) of the battery pack case (100) of FIG. 3 when cut along line I-I'. FIGS. 6A and 6B are schematic side cross-sectional views when cut along line II-II' of FIG. 3.

[0053] The lower frame (110) of the battery pack case (100) can be formed in a form in which a plurality of plates are mutually connected.

[0054] For example, the lower frame (110) according to various embodiments of the present disclosure may include a first lower plate (112) forming the outermost bottom surface of the battery pack (10), a second lower plate (111) forming the inner bottom surface of the battery pack (10) and facing the cell assembly (200), and a cooling plate (113) interposed between the first lower plate (112) and the second lower plate (111) and having a predetermined protrusion structure to form a passage (CP) space through which a coolant can flow.

[0055] In one embodiment of the present disclosure, since the lower frame (110) is configured with three layers while including a coolant passage (CP) capable of cooling the cell assembly (200) on the inside, space utilization can be maximized, manufacturing costs can be reduced, and the weight of the battery device (1) can be reduced, compared to a case where components for cooling the cell assembly (200) are provided separately from the lower frame (110) of the battery pack case (100). Furthermore, since only one layer is arranged between the coolant passage (CP) provided inside the lower frame (110) and the cell assembly (200) of another battery pack (10) (e.g., the battery pack (10b) of FIG. 1) that is laminated and combined below the battery pack (10), an additional cooling effect for the cell assembly (200) of the other battery pack (10) can also be obtained.

[0056] Meanwhile, the coolant arranged to flow along the cooling path (CP) can be introduced into the cooling path (CP) side through a cooling port (1333, see FIG. 3) provided on one side of the battery pack case (100). This coolant can circulate by cooling one or more cell assemblies (200) mounted in the battery pack case (100) while flowing along the cooling path (CP) and then being discharged to the outside of the pack case (100) through the cooling port (1333).

[0057] Each of the plates (111, 112, 113) constituting the lower frame (110) may have different sizes or shapes. For example, the first lower plate (112) constituting the outermost bottom surface of the battery pack case (100) may have a larger size than the second lower plate (111). Accordingly, the cell assembly (200) can be stably supported and foreign substances can be effectively blocked from entering from the outside through the lower surface of the battery pack (10).

[0058] A plurality of side frames (120, 130) may be arranged on the upper portion of the lower frame (110). For example, the side frames (120, 130) may be formed to extend in a vertical direction (e.g., the Z-axis direction of FIG. 3) from the lower frame (110), and may protect the side portion of the cell assembly (200) and reinforce the rigidity of the battery pack (10) in the height direction (e.g., the Z-axis direction).

[0059] Meanwhile, the side frames (120, 130) constituting the side of the battery pack case (100) may include a first side frame (120) and a second side frame (130) having different shapes.

[0060] The first side frame (120) and the second side frame (130) may be arranged adjacently so that one edge is at least partially in contact with the other to form different side surfaces of the battery pack case (100). For example, the first side frames (120) provided in one battery pack case (100) may be positioned parallel to each other, and similarly, the second side frames (130) provided in one battery pack case (100) may be positioned in a direction parallel to each other. For example, the second side frames (130) may correspond to the side frames of the front and rear ends of the battery pack (10).

[0061] For example, as illustrated in FIGS. 5A to 5C, a first side frame (120) of a battery pack case (100) according to one embodiment of the present disclosure may include a first flange (310) and a second flange (320) formed to protrude in a direction toward the outside of the battery pack (10) (or battery pack case (100)) at the upper and lower portions, respectively.

[0062] The first flange (310) and the second flange (320) can function as a joining surface or a supporting surface when the battery pack (10) is joined to another adjacent battery pack (10) by overlapping each other.

[0063] For example, the second flange (320) of the battery pack (10) (e.g., the first battery pack (10a) of FIG. 1) placed on the upper side among two adjacent battery packs (10) may be combined with the first flange (310) of the battery pack (10) (e.g., the second battery pack (10b) of FIG. 1) placed on the lower side to form a stacked combined structure of the two battery packs (10).

[0064] In addition, the first flange (310) of the battery pack (10) (e.g., the second battery pack (10b) of FIG. 1) placed at the bottom may also serve to support the load of another battery pack (10) (e.g., the first battery pack (10a) of FIG. 1) placed at the top of the battery pack (10) and laminated and connected thereto in the vertical direction.

[0065] Meanwhile, in the battery pack case (100) according to one embodiment as illustrated in FIGS. 5A and 5B, the second flange (320) of the first side frame (120) may protrude outwardly to have a wider width than the first flange (310). Accordingly, the bottom support area of ​​the battery pack case (100) may be increased, thereby ensuring stability in the stacked structure of the battery pack (10).

[0066] On the other hand, as illustrated in FIG. 5c, in a battery pack case (100) according to another embodiment, the first flange (310) and the second flange (320) of the first side frame (120) may be configured to have substantially the same width. In this case, since the widths of the upper and lower flanges of the first side frame (120) are the same, there may be an advantage in that the battery pack (10) can be stacked and stored in the battery device (1) more compactly.

[0067] Next, the second side frame (130) of the battery pack case (100) according to one embodiment of the present disclosure may include a third flange (330) that protrudes from the upper portion toward the outside of the battery pack (10) (or battery pack case (100)), as illustrated in FIGS. 6A and 6B . On the other hand, unlike the first side frame (120), the second side frame (130) may not have a separate flange at the lower portion.

[0068] Accordingly, the third flange (330) formed on the upper portion of the second side frame (130) may be arranged to face a portion of the lower frame (110) (e.g., a portion of the first lower plate (112) forming the outermost bottom surface of the lower frame (110). At this time, the portion of the lower frame (110) facing the third flange (300) may be configured to have a wider width than the second lower plate (111) and may have a structure extending toward the second side frame (130) for the purpose of securing structural stability by increasing the support area of ​​the battery pack (10).

[0069] Meanwhile, as illustrated in FIGS. 6a and 6b, the second side frame (130) does not have a separate flange at the bottom, so that the space between the third flange (330) and the lower frame (110) (e.g., the first lower plate (112) of the lower frame (110)) facing each other can be utilized to place certain parts in the space.

[0070] For example, at least one of a power port (1331), a signal port (1332), and a cooling port (1333) may be arranged in at least a portion of the second side frame (130). For example, a power port (or terminal) for electrically connecting the cell assembly (200) to the outside may be arranged in the space between the third flange (330) and the lower frame (110).

[0071] In addition, the battery pack case (100) may further include one or more cross frames (140) arranged on the upper side of the lower frame (110) to partition the internal space of the battery pack case (100). The cross frame (140) may be connected to the lower frame (110). For example, the cross frame (140) may be arranged to cross the upper surface of the lower frame (110) between the side frames (120, 130).

[0072] This cross frame (140) can divide the internal space of the pack case (100) into a plurality of accommodation spaces. In each accommodation space divided by the cross frame (140), one or more cell assemblies (200) or a control module that controls the cell assemblies (200) can be placed.

[0073] According to various embodiments of the present disclosure, at least one of the lower frame (110), the plurality of side frames (120, 130), and the cross frame (140) constituting the battery pack case (100) may be formed of a metal material having high rigidity so as to protect the battery cells (211) and ensure the structural stability of the battery device (1). For example, at least a portion of the lower frame (110) and the side frames (120, 130) may be formed of aluminum or an alloy including aluminum.

[0074] Meanwhile, in one embodiment, the plurality of side frames (120, 130) may be formed of a material with higher strength than the lower frame (110). For example, the side frames (120, 130) may be formed of a material of the aluminum alloy 6000 series, and the lower frame (110) may be formed of a material of the aluminum alloy 3000 series.

[0075] In addition, as illustrated in FIGS. 5b, 5c, and 6b, in the battery pack case (100) according to various embodiments of the present disclosure, the first side frame (120) may be joined to the first lower plate (112) and the second lower plate (111) by a first welding method (e.g., CMT welding method), and the second side frame (130) may be joined to the second lower plate (111) by the first welding method (e.g., CMT welding method), but may be configured not to be joined to the first lower plate (112) by a separate welding method.

[0076] Meanwhile, the cooling plate (113) can be joined to the first lower plate (112) and the second lower plate (111) using a second welding method (e.g., brazing method) different from the first welding method.

[0077] Accordingly, in various embodiments of the present disclosure, the process of directly connecting the second side frame (130) to the first lower plate (112) and cooling plate (113) of the lower frame (110) can be omitted.

[0078] Each of the first side frame (120) or the second side frame (130) may include a protrusion (e.g., a first protrusion (350) or a second protrusion (360)) protruding toward the inside of the battery pack case (100). The protrusions (350, 360) may be positioned in a space between the first lower plate (111) and the second lower plate (112). In particular, the protrusions (350, 360) may be configured to be in contact with the first lower plate (111) and the second lower plate (112), thereby contributing to a fixing structure between the side frame (120, 130) and the lower frame (110) when the side frame (120, 130) is inserted into the space between the two lower plates (111, 112).

[0079] For example, the problem of the upper side frames (120, 130) opening due to the upper open structure of the battery pack case (100) can be minimized, and a sufficient contact area for performing the welding described above can be provided. In addition, the protrusions (350, 360) can minimize the reduction in rigidity due to the cooling structure and the integrated structure of the lower frame of the present invention, especially the reduction in rigidity in the outer region of the lower frame (110). Meanwhile, unlike the drawing, the protrusions (350, 360) can form a hollow structure like other regions of the side frames (120, 130), thereby contributing to the ease of manufacturing and weight reduction of the side frames (120, 130) while also ensuring sufficient rigidity.

[0080] FIG. 7 is a drawing for explaining a vehicle (1000) including a battery pack (10) (or a battery device (1) including battery packs (10)) according to various embodiments of the present disclosure.

[0081] Referring to FIG. 7, a vehicle (1000) according to various embodiments may include at least one battery device (1) in the form of a battery pack (10) or a plurality of battery packs (10) stacked and connected according to various embodiments of the present disclosure.

[0082] A battery device (1) according to various embodiments of the present disclosure may be configured to seal by omitting a separate cover member covering each battery pack (10), and having one battery pack (10) cover the upper portion of another battery pack (10) disposed thereunder.

[0083] Accordingly, in a battery device (1) composed of a plurality of battery packs (10), the wasted space between the battery packs (10) can be reduced, thereby increasing the energy density.

[0084] In addition, in the connection between a plurality of battery packs (10) stacked in one direction (e.g., up and down, Z direction of FIG. 1), the side frames (120, 130) of the upper battery pack (10) and the side frames (120, 130) of the lower battery pack (10) can be connected based on the flanges provided on the respective side frames (120, 130). Meanwhile, in the case of the second side frame (130) corresponding to the front or rear of the battery pack (10) or the battery device (1), the flange is not provided at the lower portion, thereby increasing the usability in terms of space arrangement.

[0085] Furthermore, the battery device (1) according to the embodiments is manufactured by stacking a plurality of standardized battery packs (10), and thus, battery devices (1) of various capacities and sizes can be quickly manufactured.

[0086] In particular, the battery device (1) according to the embodiments has a structure in which a plurality of battery packs (10) are integrated, while also having high sealing and structural stability, and thus can be used in various ways in large electric vehicles including commercial vehicles that require large-capacity energy storage devices.

[0087] While various embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and it will be apparent to those skilled in the art that various modifications and variations are possible without departing from the technical spirit of the present invention as set forth in the claims. Furthermore, the embodiments described above may be implemented by deleting some components, and the embodiments may be implemented in combination with each other.

Claims

1. In the battery pack, A cell assembly comprising a plurality of battery cells; and A battery pack case comprising: a battery pack case accommodating the above cell assembly; The above battery pack case, lower frame; and It comprises a plurality of side frames extending in a substantially vertical direction from the lower frame, The above plurality of side frames are, A first side frame including a first flange and a second flange protruding toward the outside of the battery pack case from the upper and lower portions, respectively; and A battery pack comprising a combination of a second side frame, wherein one edge is configured to at least partially contact the first side frame, and a third flange protruding from the upper portion toward the outside of the battery pack case.

2. In paragraph 1, The above lower frame, A battery pack comprising a coolant passage for cooling the cell assembly therein.

3. In paragraph 1, The above lower frame, A first lower plate forming an outer bottom surface; a second lower plate forming an inner bottom surface; and A battery pack comprising a cooling plate interposed between the first lower plate and the second lower plate and having a predetermined protruding structure to form a space for a coolant passage for cooling the cell assembly.

4. In paragraph 3, The above first side frame, The first lower plate and the second lower plate are each joined by a first welding method, The above second side frame, A battery pack, which is joined to the second lower plate by the first welding method, but is not joined to the first lower plate by the welding method.

5. In paragraph 4, A battery pack, wherein the cooling plate is joined to the first lower plate and the second lower plate by a second welding method different from the first welding method.

6. In paragraph 3, At least one of the plurality of side frames, A battery pack comprising a protrusion protruding toward the inside of the battery pack case.

7. In paragraph 6, A battery pack, wherein the protrusion is disposed in the space between the first lower plate and the second lower plate.

8. In paragraph 1, Includes a terminal that electrically connects the above cell assembly to the outside, The third flange of the second side frame is positioned to face a part of the lower frame, The battery pack, wherein the terminal is located in the space between the third flange and the lower frame, which face each other.

9. In paragraph 1, A battery pack wherein the above plurality of side frames are formed of a material having higher strength than the lower frame.

10. In paragraph 1 A battery pack, wherein the battery pack case has a bonding structure capable of being laminated and bonded to another battery pack along one direction through at least one of the first flange or the second flange.

11. A battery device in which a plurality of battery packs according to paragraph 1 are provided and vertically stacked, and the second flange of the upper battery pack among two adjacent battery packs is vertically supported by the first flange of the lower battery pack.

12. In a battery pack case configured to accommodate a cell assembly including a plurality of battery cells, lower frame; and comprising a plurality of side frames connected in a vertical direction from the lower frame; The above plurality of side frames, A first side frame including a first flange and a second flange each protruding toward the outside of the battery pack case from the upper and lower portions; and A battery pack case comprising a second side frame configured such that one edge is at least partially in contact with the first side frame and includes a third flange formed to protrude toward the outside of the battery pack case from the upper portion.

13. In paragraph 12, A battery pack case, wherein the first flange and the second flange have substantially the same width.

14. In paragraph 12, A battery pack case wherein the second flange is formed to protrude with a width greater than that of the first flange.

15. In Article 12 The above second side frame, Not including a flange formed to protrude toward the outside of the battery pack case from the bottom, A battery pack case, wherein the third 'flange' is positioned to face a portion of the lower frame.

Images