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

Abstract

This invention provides a structure that can maximize energy density by reducing wasted space in a battery device composed of one or more battery packs, and that allows for the rapid and stable stacking and bonding of multiple battery packs. [Solution] A battery pack in various embodiments includes a cell assembly containing a plurality of battery cells and a battery pack case housing the cell assembly, wherein the battery pack case includes a lower frame and a plurality of side frames extending substantially vertically from the lower frame, and the plurality of side frames may consist of a combination of a first side frame including a first side frame and a second side frame including a third side frame having at least one corner in contact with the first side frame and projecting outward from the battery pack case from the top and bottom, respectively, and a third side frame including a third flange projecting outward from the top of the battery pack case. Other embodiments are possible.

Description

Technical Field

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

Background Art

[0002] Secondary batteries can be charged and discharged and are widely used in mobile devices such as digital cameras, mobile phones, and notebook computers. In particular, in recent years, they have attracted attention as energy sources for electric vehicles, energy storage systems (ESS), etc.

[0003] In electric vehicles and energy storage devices, due to the requirement for large capacity and high output power, large capacity battery devices in which a plurality of battery modules or battery packs each housing a large number of secondary batteries (battery cells) are connected are widely used.

[0004] In particular, in the case of large vehicles such as commercial vehicles, due to the requirement for a large capacity energy source for long-distance operation of the vehicle, a battery device in which a large number of battery packs are connected is applied.

[0005] In the case of an example of a battery device applied to such a large vehicle, a method of fixing a large number of battery packs to the vehicle respectively and electrically connecting them to each other to form an entire battery device can be applied.

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the case of the prior art, in order to fix each battery pack, a complicated and non-uniform fixing device is required, and a separation interval occurs between the battery packs, which may cause a problem of reducing the energy density per unit volume of the battery device.

[0007] The various embodiments of this disclosure have been devised to improve upon the aforementioned conventional problems, and aim to propose a structure that can maximize energy density by reducing the space wasted in a battery device composed of one or more battery packs, and that can rapidly and stably stack and bond a large number of battery packs.

[0008] The technical problems that this embodiment aims to solve are not limited to those described above, and other technical problems can be inferred from the following embodiments. [Means for solving the problem]

[0009] A battery pack in various embodiments includes a cell assembly containing a plurality of battery cells and a battery pack case housing the cell assembly, the battery pack case including a lower frame and a plurality of side frames formed substantially vertically from the lower frame, the plurality of side frames may consist of a combination of a first side frame including a first flange and a second flange projecting outward from the top and bottom of the battery pack case, respectively, and a second side frame including a third flange projecting outward from the top of the battery pack case, with one corner configured to at least partially contact the first side frame.

[0010] A battery pack case in various embodiments is configured to house a cell assembly comprising a plurality of battery cells and includes a lower frame and a plurality of side frames connected perpendicularly from the lower frame, the plurality of side frames including a first side frame having a first flange and a second flange, respectively, that project outward from the top and bottom of the battery pack case, and a second side frame having a third flange that project outward from the top of the battery pack case, with one corner configured to at least partially contact the first side frame. [Effects of the Invention]

[0011] Various embodiments of this disclosure can minimize wasted space in a battery device having a structure in which multiple battery packs can be stacked and coupled together, efficiently arrange the components necessary for the use of the battery device, and provide a battery device that maximizes energy density.

[0012] Furthermore, it is possible to provide a battery device that ensures structural stability while quickly and easily stacking and bonding multiple battery packs.

[0013] Furthermore, by using the lower frame of a stackable battery pack case to cool the cell assembly, not only is the number of components reduced, but a cooling effect can also be obtained on the cell assemblies of other adjacent battery packs (for example, battery packs stacked on the lower side).

[0014] The effects of the present invention are not limited to those mentioned above, and any further effects not mentioned should be clearly understood by those skilled in the art from the description of the claims. [Brief explanation of the drawing]

[0015] [Figure 1] This is a schematic perspective view of a battery device according to one embodiment of the present disclosure. [Figure 2] This is a schematic exploded perspective view of a battery device according to one embodiment of the present disclosure. [Figure 3] This is a schematic exploded perspective view of a battery pack according to one embodiment of the present disclosure. [Figure 4] This is a schematic exploded perspective view of the lower frame of a battery pack case according to one embodiment of the present disclosure. [Figure 5a] This is a partial cross-sectional view of a battery pack case according to various embodiments of the present disclosure. [Figure 5b] This is a partial cross-sectional view of a battery pack case according to various embodiments of the present disclosure. [Figure 5c] This is a partial cross-sectional view of a battery pack case according to various embodiments of the present disclosure. [Figure 6a] This is a partial cross-sectional view of a battery pack case according to one embodiment of the present disclosure. [Figure 6b] A partial cross-sectional view of a battery pack case according to an embodiment of the present disclosure. [Figure 7] A diagram for explaining an automobile including a battery pack or a battery device according to an embodiment of the present disclosure. Embodiments for the implementation of the invention

[0016] Prior to the detailed description of the present invention, terms and words used in this specification and the claims should not be construed as being limited to their ordinary or dictionary meanings. Based on the principle that the inventor can appropriately define the concept of the terms in order to explain his own invention in the best way, they must be construed in a meaning and concept consistent with the technical idea of the present invention. 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 ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modifications that can replace them at the time of this application.

[0017] The same reference numerals or signs described in each of the drawings attached to this specification indicate components or elements that perform substantially the same functions. For the convenience of explanation and understanding, the same reference numerals or signs may be used for explanation even in different embodiments. That is, even if components having the same reference numeral are illustrated in a plurality of drawings, the plurality of drawings do not necessarily mean the same embodiment.

[0018] In the following description, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "including" or "comprising" are intended to specify that there are features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and do not preclude the existence or addition possibility of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0019] In the following description, expressions such as upper side, upper portion, lower side, lower portion, side surface, front surface, rear surface, etc. are expressed based on the directions shown in the drawings. It should be clearly stated in advance that if the direction of the object is changed, the expressions may be different.

[0020] In addition, in this specification and the claims, for the purpose of distinguishing components, terms including ordinal numbers such as "first", "second", etc. may be used. Such ordinal numbers are used to distinguish the same or similar components from each other, and the meaning of the terms should not be limited by the use of such ordinal numbers. As an example, for components combined with such ordinal numbers, their order of use, order of arrangement, etc. should not be limited by the numbers. If necessary, each ordinal number may be used by replacing each other.

[0021] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the idea of the present invention is not limited to the presented embodiments. For example, those skilled in the art who understand the idea of the present invention should be able to propose other embodiments included within the scope of the idea of the present invention through addition, modification, or deletion of components, etc. This should also be included within the scope of the idea of the present invention. The shape and size of elements in the drawings, etc. may be exaggerated for clearer explanation.

[0022] FIG. 1 is a schematic perspective view of a battery device 1 according to an embodiment of the present disclosure. FIG. 2 is a schematic exploded perspective view of the battery device 1 according to an embodiment of the present disclosure.

[0023] Referring to FIGS. 1 and 2, the battery device 1 according to various embodiments can include at least one battery pack 10 that can be stacked and coupled along one direction (for example, the Z-axis direction).

[0024] Each battery pack 10 can include a cell assembly 200 including a plurality of battery cells and a pack case 100 that houses the cell assembly 200.

[0025] In various embodiments of this disclosure, each battery pack 10 constituting the battery device 1 may have the same structure and form as one another. For example, a user (or manufacturer) can easily determine the number of battery packs 10 to be applied to each device in accordance with the amount of power or size required by each device, and realize the entire battery device 1 by stacking and combining an appropriate number of battery packs 10.

[0026] For example, as shown in Figure 1, the multiple battery packs 10 may include a first battery pack 10a and a second battery pack 10b that are stacked and coupled together along one direction (for example, the Z direction). In this case, the first battery pack 10a and the second battery pack 10b may have the same structure as each other.

[0027] On the other hand, unlike those shown in Figures 1 and 2, the battery device 1 according to various embodiments of this disclosure may consist of three or more battery packs 10 stacked in one direction, or it may consist of only a single battery pack 10. However, even in this case, each battery pack 10 may have a stackable structure as required by the user.

[0028] For example, in each battery pack 10 that constitutes the battery device 1, the battery pack case 100 may have a structure in which the top is open.

[0029] For example, the open top of one battery pack 10 (e.g., the second battery pack 10b in Figures 1 and 2) can be covered through 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 in Figures 1 and 2) that is stacked and bonded on top of it.

[0030] On the other hand, if there are no other battery packs 10 stacked on top of the battery pack 10, that is, in the case of the topmost battery pack 10, the open top can be covered by a separate component, such as an upper cover 20.

[0031] 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 open to the top without the need for a separate cover member to cover the internal space. In this way, the internal space of the second pack case 100b, which is open to the top, can be closed by the first pack case 100a of the first battery pack 10a, which is stacked on top of the second battery pack 10b. That is, the first pack case 100a is stacked on top of the second pack case 100b, and the lower surface of the first pack case 100a is in close contact with the upper part of the second pack case 100b, thereby closing the internal space of the second pack case 100b.

[0032] In this way, multiple battery packs 10 are stacked and connected, and one of the battery packs 10 closes the internal space of the battery pack 10 located below it, thereby eliminating the need for separate cover members for the battery packs 10 other than the topmost battery pack 10.

[0033] In various embodiments of this disclosure, such a stacked structure can simplify the structure of the battery device 1 and allow for the close coupling of multiple battery packs 10 to maximize the overall energy density of the battery device 1.

[0034] In the following, the battery pack 10 constituting the battery device 1 according to this embodiment will be described in detail with reference to Figures 3 and 4.

[0035] Figure 3 is a schematic exploded perspective view of a battery pack 10 according to one embodiment of the present disclosure. Figure 4 is a schematic exploded perspective view showing the plates constituting the lower frame 110 of a battery pack case 100 according to one embodiment of the present disclosure.

[0036] For example, the lower frame 110 of the battery pack 10 and battery pack case 100 in Figures 3 and 4 can be understood as part of the components that make up the battery device 1 shown in Figures 1 and 2, respectively.

[0037] According to various embodiments, the battery pack 10 may include a cell assembly 200 and a battery pack case 100 that houses at least one cell assembly 200 in an internal space.

[0038] The cell assembly 200 may include a stack of battery cells (or a 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 in Figure 3) to form the stack of battery cells 210. Alternatively, the cell assembly 200 may further include a busbar assembly 220 that electrically connects each of the battery cells 211.

[0039] 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 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 cells 211 according to various embodiments may consist of prismatic or cylindrical secondary batteries to form the cell assembly 200.

[0040] On the other hand, the cell stack 210 may include protective members to protect the multiple 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, which occurs when each battery cell 211 expands during the charging and discharging process. As another example, the protective member may also include an insulating sheet to block the transfer of high-temperature thermal energy or flames generated in a particular battery cell 211 to other adjacent components.

[0041] 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, the busbar assemblies 220 may be provided in pairs, as shown in Figure 3, with each facing the cell stack 210 in the longitudinal direction of the battery cells 211 (e.g., the X-axis direction in Figure 3).

[0042] On the other hand, in various embodiments, the cell assembly 200 may further include an insulating cover positioned between the busbar assembly 220 and the pack case 100. For example, the insulating cover can protect the busbar assembly 220 and prevent short circuits that may occur between the busbars and the pack case 100.

[0043] In various embodiments of this disclosure, the battery pack 10 may have a so-called CTP (cell to pack) type structure in which each cell assembly 200 can be directly housed in the pack case 100 without a separate module case covering the cell assembly 200. In this case, by eliminating the module case, losses due to space and assembly tolerances that were previously occupied by the module case are minimized, thereby enabling the implementation of a larger number of battery cells or the placement of larger sized battery cells, and thus improving the energy density of the battery pack 10.

[0044] The battery pack case 100 can accommodate one or more cell assemblies 200 in its internal space. For example, the battery pack case 100 may 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) coupled to the lower frame 110 to form the sides of the pack case 100.

[0045] In the following, we will describe in detail the battery pack case 100 according to various embodiments of this disclosure, with reference not only to Figures 3 and 4, but also to Figures 5a to 6b.

[0046] Figures 5a to 6b are partial cross-sectional views of the battery pack case 100 according to various embodiments of the present disclosure. Specifically, Figures 5a to 5c are schematic side cross-sectional views obtained when the first side frame 120 of the battery pack case 100 of Figure 3 is cut along line II'. Figures 6a and 6b are schematic side cross-sectional views obtained when cut along line II-II' of Figure 3.

[0047] The lower frame 110 of the battery pack case 100 may be formed in a configuration in which multiple plates are interconnected.

[0048] For example, the lower frame 110 according to various embodiments of the present disclosure may include a first lower plate 112 that forms the outermost bottom surface of the battery pack 10, a second lower plate 111 that forms the inner bottom surface of the battery pack 10 and faces the cell assembly 200, and a cooling plate 113 interposed between the first lower plate 112 and the second lower plate 111, having a predetermined uneven structure to form a flow path (CP) space through which a refrigerant can flow.

[0049] In one embodiment of the present disclosure, the lower frame 110 is composed of three layers, even though it includes a coolant channel (CP) inside that can cool the cell assembly 200. This maximizes space utilization, reduces manufacturing costs, and reduces the weight of the battery device 1, 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, by arranging only one layer between the coolant channel CP inside the lower frame 110 and the cell assembly 200 of another battery pack 10 (for example, battery pack 10b in Figure 1) that is stacked and coupled below the battery pack 10, an additional cooling effect on the cell assembly 200 of the other battery pack 10 can also be obtained.

[0050] On the other hand, the refrigerant provided to flow along the refrigerant flow path CP can flow into the refrigerant flow path CP side through a cooling port 1333 (see Figure 3) provided on one side of the battery pack case 100. This refrigerant can circulate by flowing along the refrigerant flow path CP, cooling one or more cell assemblies 200 mounted in the battery pack case 100, and then being discharged to the outside of the pack case 100 through the cooling port 1333.

[0051] Each of the plates 111, 112, and 113 that make up the lower frame 110 may differ in size or shape from one another. For example, the first lower plate 112 that makes up the outermost bottom surface of the battery pack case 100 may be larger than the second lower plate 111. This allows for stable support of the cell assembly 200 and effectively blocks foreign matter from entering from the outside through the lower surface of the battery pack 10.

[0052] Multiple side frames 120, 130 may be positioned on top of the lower frame 110. For example, the side frames 120, 130 can be formed to extend vertically from the lower frame 110 (e.g., in the Z-axis direction in Figure 3), protecting the side portions of the cell assembly 200 and enhancing the rigidity of the battery pack 10 in the height direction (e.g., in the Z-axis direction).

[0053] On the other hand, the side frames 120 and 130 that constitute the sides of the battery pack case 100 may include a first side frame 120 and a second side frame 130 having different shapes from each other.

[0054] The first side frame 120 and the second side frame 130 are arranged adjacent to each other such that at least one corner touches, and can form different sides of the battery pack case 100. For example, the first side frame 120 provided on one battery pack case 100 may be positioned parallel to each other, and similarly, the second side frame 130 provided on one battery pack case 100 may also be positioned parallel to each other. For example, the second side frame 130 may correspond to the front and rear side frames of the battery pack 10.

[0055] For example, as shown in Figures 5a to 5c, the 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 30 that are formed to protrude from the upper and lower ends toward the outside of the battery pack 10 (or battery pack case 100), respectively.

[0056] The first flange 310 and the second flange 320 can function as a coupling surface or a support surface when the battery pack 10 is coupled to another adjacent battery pack 10 by overlapping.

[0057] For example, of two adjacent battery packs 10, the second flange 320 of the upper battery pack 10 (for example, the first battery pack 10a in Figure 1) can be coupled to the first flange 310 of the lower battery pack 10 (for example, the second battery pack 10b in Figure 1) to form a stacked bonded structure of the two battery packs 10.

[0058] Furthermore, the first flange 310 of the battery pack 10 located at the bottom (for example, the second battery pack 10b in Figure 1) can also be positioned above the battery pack 10 to vertically support the load of other battery packs 10 (for example, the first battery pack 10a in Figure 1) that are stacked and coupled together.

[0059] On the other hand, as shown in Figures 5a and 5b, in a battery pack case 100 according to one embodiment, the second flange 320 of the first side frame 120 can protrude further outward so as to have a greater width than the first flange 310. This increases the bottom support area of ​​the battery pack case 100 and ensures stability in the stacked structure of the battery pack 10.

[0060] On the other hand, as shown in Figure 5c, in the 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 packs 10 can be stacked and combined more compactly and housed in the battery device 1.

[0061] 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 top toward the outside of the battery pack 10 (or battery pack case 100), as shown in Figures 6a and 6b. On the other hand, unlike the first side frame 120, the second side frame 130 does not need to have a separate flange at its bottom.

[0062] As a result, the third flange 330 formed on the upper part of the second side frame 130 can be positioned to face a portion of the lower frame 110 (for example, a portion of the first lower plate 112 that forms the outermost bottom surface of the lower frame 110). In this case, the portion of the lower frame 110 facing the third flange 300 may be configured to have a greater width than the second lower plate 111 and may have a structure that extends toward the second side frame 130, for the purpose of ensuring structural stability by increasing the support area of ​​the battery pack 10.

[0063] On the other hand, as shown in Figures 6a and 6b, the second side frame 130 does not have a separate flange at its lower part, so that the space between the mutually facing third flange 330 and the lower frame 110 (for example, the first lower plate 112 of the lower frame 110) can be utilized to arrange a predetermined component in that space.

[0064] For example, at least one of the following components may be located in at least a portion of the second side frame 130: a power port 1331, a signal port 1332, and a cooling port 1333. For example, a power port (or terminal) for electrically connecting the cell assembly 200 to the outside may be located in the space between the third flange 330 and the lower frame 110.

[0065] In addition, the battery pack case 100 may further include one or more cross frames 140 positioned above the lower frame 110 to partition the internal space of the battery pack case 100. The cross frames 140 may be connected to the lower frame 110. For example, the cross frames 140 may be positioned to cross the upper surface of the lower frame 110 between the side frames 120, 130.

[0066] Such a cross frame 140 can partition the internal space of the pack case 100 into multiple storage spaces. One or more cell assemblies 200 or control modules for controlling the cell assemblies 200 can be placed in each storage space partitioned by the cross frame 140.

[0067] According to various embodiments of this disclosure, at least one of the lower frame 110, the multiple side frames 120, 130, and the cross frame 140 constituting the battery pack case 100 may be formed of a highly rigid metal material 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 made of aluminum or an aluminum-containing alloy.

[0068] On the other hand, in one embodiment, the multiple side frames 120, 130 may be formed from a material with higher strength than the lower frame 110. For example, the side frames 120, 130 may be formed from an aluminum alloy 6000 series material, and the lower frame 110 may be formed from an aluminum alloy 3000 series material.

[0069] Furthermore, as illustrated in Figures 5b, 5c, and 6b, in the battery pack case 100 according to various embodiments of the present disclosure, the first side frame 120 can 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 can be joined to the second lower plate 111 by the first welding method (e.g., CMT welding method), while being configured not to be joined to the first lower plate 112 by a separate welding method.

[0070] On the other hand, the cooling plate 113 can be joined to the first lower plate 112 and the second lower plate 111 by a second welding method (for example, a brazing method) different from the first welding method.

[0071] As a result, in various embodiments of this disclosure, the second side frame 130 can omit the process of directly coupling with the first lower plate 112 and cooling plate 113 of the lower frame 110.

[0072] Each of the first side frame 120 or the second side frame 130 may include protrusions (e.g., first protrusion 350, second protrusion 360) projecting inward from the battery pack case 100. The protrusions 350, 360 may be positioned in the space between the first lower plate 111 and the second lower plate 112. In particular, the protrusions 350, 360 may be configured to abut against the first lower plate 111 and the second lower plate 112, contributing to a fixing structure between the side frames 120, 130 and the lower frame 110 when the side frames 120, 130 are inserted into the space between the two lower plates 111, 112.

[0073] For example, the problem of the upper part of the side frames 120 and 130 spreading out due to the open top structure of the battery pack case 100 can be minimized, and a sufficient contact area for the aforementioned welding can be provided. In addition, the protrusions 350 and 360 can minimize the reduction in rigidity due to the integrated structure of the cooling structure and the lower frame of the present invention, in particular the reduction in rigidity of the outer region of the lower frame 110. On the other hand, contrary to the figures shown, the protrusions 350 and 360 can also form a hollow structure, similar to other regions of the side frames 120 and 130, to ensure sufficient rigidity while contributing to the ease of manufacturing and weight reduction of the side frames 120 and 130.

[0074] Figure 7 is a diagram illustrating an automobile 1000 including a battery pack 10 (or a battery device 1 comprising the battery pack 10) according to various embodiments of the present disclosure.

[0075] Referring to Figure 7, the automobile 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 coupled together according to various embodiments of the present disclosure.

[0076] In various embodiments of the present disclosure, the battery device 1 may omit separate cover members covering each battery pack 10, and be configured such that one battery pack 10 covers and seals the top of the other battery pack 10 located below it.

[0077] This reduces the wasted space between battery packs 10 in a battery device 1 composed of numerous battery packs 10, thereby increasing the energy density.

[0078] Furthermore, in the connection between multiple battery packs 10 stacked in one direction (for example, vertically, in the Z direction in Figure 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 flanges provided on each side frame 120, 130. On the other hand, in the case of a second side frame 130 corresponding to the front or rear of the battery pack 10 or battery device 1, the absence of a flange at the bottom can improve usability in terms of spatial arrangement.

[0079] Furthermore, the battery device 1 according to this embodiment is manufactured by stacking a large number of standardized battery packs 10, thereby enabling the rapid production of battery devices 1 of various capacities and sizes.

[0080] In particular, the battery device 1 according to this embodiment has a structure in which a large number of battery packs 10 are integrated, yet it has high airtightness and structural stability, and can be used in a variety of applications in large electric vehicles, including commercial vehicles, that require a large-capacity energy storage device.

[0081] Although various embodiments of the present invention have been described in detail above, it should be clear to any person with average technical knowledge that the scope of the present invention is not limited thereto, and that various modifications and variations are possible without departing from the technical spirit of the invention as described in the claims. Furthermore, the embodiments described above can be implemented by omitting some components, and each embodiment may be implemented in combination with one another.

Claims

1. It is a battery pack, A cell assembly containing multiple battery cells, The battery pack includes a battery pack case that houses the cell assembly, The aforementioned battery pack case is Lower frame and It includes a plurality of side frames that are formed to extend substantially vertically from the lower frame, The aforementioned plurality of side frames are A first side frame including a first flange and a second flange that protrude outward from the top and bottom of the battery pack case, respectively, It is configured in combination with a second side frame, which has one corner configured to contact the first side frame at least partially, and includes a third flange that protrudes from the top toward the outside of the battery pack case, but does not include a flange that protrudes from the bottom toward the outside of the battery pack case. The aforementioned lower frame is A first lower plate that forms the outer bottom surface, A second lower plate that forms the inner bottom surface, Includes, The first side frame described above is The first lower plate and the second lower plate are joined together by the first welding method, The aforementioned second side frame is The second lower plate is joined to the first welding method, The first lower plate is not joined by welding. Battery pack.

2. The aforementioned lower frame is The internal structure includes a refrigerant flow path for cooling the cell assembly, The battery pack according to claim 1.

3. The aforementioned lower frame further, A cooling plate interposed between the first lower plate and the second lower plate, having a predetermined uneven structure, and forming a space for a refrigerant flow path to cool the cell assembly, The battery pack according to claim 1, including the following:

4. The cooling plate is, The first lower plate and the second lower plate are joined together by a second welding method different from the first welding method. The battery pack according to claim 3.

5. At least one of the aforementioned plurality of side frames is Including a protrusion that extends inward toward the inside of the battery pack case, The battery pack according to claim 3.

6. The protruding portion is positioned in the space between the first lower plate and the second lower plate. The battery pack according to claim 5.

7. The cell assembly includes a terminal that electrically connects to the outside, The third flange of the second side frame is positioned to face a portion of the lower frame, The terminal is located in the space between the third flange and the lower frame, which face each other. The battery pack according to claim 1.

8. The aforementioned plurality of side frames are formed of a material with higher strength than the lower frame. The battery pack according to claim 1.

9. The battery pack case has a coupling structure that allows it to be stacked and coupled to other battery packs in one direction through at least one of the first flange or the second flange. The battery pack according to claim 1.

10. A battery device, A plurality of battery packs according to any one of claims 1 to 8 are provided and stacked and coupled in a vertical direction, Of the two adjacent battery packs, the second flange of the upper battery pack is supported vertically by the first flange of the lower battery pack. battery device.

11. A battery pack case configured to house a cell assembly containing multiple battery cells, Lower frame and It includes a plurality of side frames connected vertically from the lower frame, The aforementioned plurality of side frames are A first side frame including a first flange and a second flange, respectively, which are formed to protrude outward from the top and bottom of the battery pack case, A second side frame, comprising a third flange formed to project outward from the top toward the outside of the battery pack case, with one corner configured to at least partially contact the first side frame, and not including a flange projecting outward from the bottom toward the outside of the battery pack case, Includes, The aforementioned lower frame is A first lower plate that forms the outer bottom surface, A second lower plate that forms the inner bottom surface, Includes, The first side frame described above is The first lower plate and the second lower plate are joined together by the first welding method, The aforementioned second side frame is The second lower plate is joined to the first welding method, The first lower plate is not joined by welding. Battery pack case.

12. The first flange and the second flange have substantially the same width as each other. The battery pack case according to claim 11.

13. The second flange is formed to protrude with an even greater width than the first flange. The battery pack case according to claim 11.

14. The third flange is positioned to face a portion of the lower frame, The battery pack case according to claim 11.

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