Battery packs and automobiles including them

Abstract

The battery pack according to the present invention may include a cell array structure containing a plurality of battery cells, a pack case housing the cell array structure, and a fixing portion provided at the opposing portion between the cell array structure and the pack case, which fixes the cell array structure to the pack case by mutual shape coupling.

Description

Technical Field

[0001] The present invention relates to a battery pack and an automobile including the same, and more specifically, to a battery pack capable of increasing the energy density of a battery pack by mounting a cell array structure on a pack case using the empty space between battery cells, and an automobile including the same. This application claims priority based on Korean Patent Application No. 10-2023-0123394 filed on September 15, 2023, and all the contents disclosed in the specification and drawings of the application are incorporated into this application.

Background Art

[0002] Secondary batteries with high applicability according to product groups and having electrical characteristics such as high energy density are generally applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by an electric drive source. Such secondary batteries not only have the main advantage of being able to dramatically reduce the use of fossil fuels but also are environmentally friendly in that they do not generate any by-products due to energy use and are attracting attention as a new energy source for improving energy efficiency.

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

[0004] On the other hand, lithium-ion secondary batteries can be classified into pouch-type secondary batteries, in which the electrode assembly is incorporated into an aluminum laminate sheet pouch, and can-type secondary batteries, in which the electrode assembly is incorporated into a metal can, depending on the shape of the battery case. Furthermore, can-type secondary batteries can be classified into cylindrical batteries and prismatic batteries depending on the shape of the metal can.

[0005] In particular, cylindrical batteries are used as battery modules or battery packs by superimposing or stacking multiple battery cells, either on themselves or attached to cartridges, to provide high voltage and high current, forming at least one unit assembly (e.g., a cell-to-pack structure), which is then electrically connected and packaged in a pack case.

[0006] Recently, unit assemblies composed of multiple battery cells have tended to increase in size, area, and weight as pack density increases. This necessitates further improvements to the mounting structure that firmly connects such unit assemblies to the pack case. In particular, from the perspective of energy density (E / D), it is necessary to optimize the mounting structure and shape to maximize cell capacity per unit volume while also improving ease of assembly. [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] This invention has been made in consideration of the above-mentioned problems, and the problem that this invention aims to solve is to provide a battery pack in which a protruding structure provided on the inner wall of the pack case and a recessed structure formed in the empty space between battery cells are provided so as to be shape-coupled with each other, thereby optimizing the mounting structure of the cell array structure to the pack case, and thereby increasing the energy density of the battery pack.

[0008] The technical problems that this invention aims to solve are not limited to those described above, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention below. [Means for solving the problem]

[0009] The battery pack according to the present invention may include a cell array structure containing a plurality of battery cells, a pack case housing the cell array structure, and a fixing portion provided at the opposing portion between the cell array structure and the pack case, which fixes the cell array structure to the pack case by mutual shape coupling.

[0010] The fixing portion may be configured such that a protruding structure provided on either the cell array structure or the pack case and a recessed structure provided on the other of the cell array structure or the pack case are shape-coupled to each other.

[0011] The pack case includes a bottom plate positioned at the lower part of the cell array structure and an outer side wall positioned on the outer edge of the bottom plate, and the fixing portion may be provided on the outermost surface of the cell array structure and on the inner wall of the outer side wall.

[0012] The fixing portion may include a fastening projection provided on either the cell array structure or the outer side wall, and a fastening receiving groove provided on the other of the cell array structure or the outer side wall.

[0013] The cell array structure includes a plurality of unit cell groups, each containing a plurality of battery cells, and a side frame positioned between the plurality of unit cell groups, wherein the side frame includes a side structure interposed between the unit cell groups and a side wall interposed between the pack case and the unit cell groups, the fastening projection is provided on the outer side wall, and the fastening accommodating groove is provided on the side wall.

[0014] The fastening accommodating groove portion is provided along the thickness direction of the sidewall and may include an inner recessed groove formed on one surface of the sidewall and a mounting step provided so as to protrude from the inner recessed groove.

[0015] When the cell array structure is coupled to the pack case, the fastening protrusion can be securely attached to and supported by the mounting step.

[0016] The fastening projection may be provided such that its cross-section protrudes in a triangular shape.

[0017] The inner recessed groove may be provided in a triangular shape, corresponding to the shape of the fastening projection.

[0018] The inner recessed groove may be formed in an area where, when the cell array structure is viewed from above, one battery cell and another adjacent battery cell are positioned side by side without interference.

[0019] The cell array structure can be mounted and supported on the pack case by sliding downward when the fastening projection is inserted into the fastening housing groove.

[0020] Fastening holes are formed in the fastening projection and the mounting step in the vertical direction, and fastening members can be connected to the fastening holes.

[0021] Further, according to the present invention, an automobile including the above-described battery pack can be provided.

Effects of the Invention

[0022] According to one aspect of the present invention, a protruding structure provided on the inner wall of the pack case and a recessed structure formed in the empty space between battery cells are provided so as to be shape-coupled with each other, and the mounting structure of the cell array structure with respect to the pack case is optimized, whereby the energy density of the battery pack can be increased.

[0023] Also, according to one aspect of the present invention, a strong coupling force between the pack case and the cell array structure is ensured, and the cell array structure, which tends to be large in area and heavy in weight, can be firmly fixed on the pack case.

[0024] Also, according to one aspect of the present invention, mounting and coupling are possible by slidingly coupling the recessed structure of the cell array structure to the protruding structure of the pack case, and the assembling property of the pack can be improved.

[0025] The effects of the present invention are not limited to the above-described effects, and effects not mentioned will be clearly understood by those having ordinary knowledge in the technical field to which the present invention pertains from the present specification and the accompanying drawings.

[0026] The following drawings attached to this specification illustrate desirable embodiments of the present invention and serve to further understand the technical idea of the present invention together with the detailed description of the invention. Therefore, the present invention should not be construed as being limited only to the matters described in the drawings.

Brief Description of the Drawings

[0027] <00><000094> [Figure 1] It is a schematic perspective view of the main configuration of a battery pack according to an embodiment of the present invention. [Figure 2] It is an exploded perspective view of FIG. 1. [Figure 3] This is a perspective view of a battery pack according to one embodiment of the present invention, with the top cover plate removed. [Figure 4] Figure 2 is an enlarged perspective view of the pack case portion. [Figure 5] This is a top view of Figure 4. [Figure 6] Figure 2 is an enlarged perspective view of the side frame. [Figure 7] This figure shows a cell array structure applied to a battery pack according to one embodiment of the present invention. [Figure 8] Figure 7 is a perspective view showing the joined parts. [Figure 9] This figure shows a portion of the upper part of a cell array structure housed in a battery pack according to one embodiment of the present invention. [Figure 10] Figure 9 is a perspective view of the incision along line A-A'. [Figure 11] This is a longitudinal cross-sectional view of a battery pack according to one embodiment of the present invention. [Figure 12] This is a diagram illustrating an automobile relating to one embodiment of the present invention. [Modes for carrying out the invention]

[0028] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and in the claims shall not be interpreted in their usual and dictionary sense, but rather in a sense and concept appropriate to the technical idea of ​​the present invention, in accordance with the principle that the inventor himself may appropriately define the concept of terms in order to best describe the invention.

[0029] Therefore, it should be understood that the configurations shown in the embodiments described herein represent only one of the most preferred embodiments of the present invention and do not represent the entire technical concept of the present invention, and that there may be a variety of equivalents and modifications that can be substituted therein at the time of filing this application.

[0030] The dimensions of each component or specific parts thereof in the drawings are exaggerated, omitted, or schematic for the sake of clarity and ease of explanation. Therefore, the dimensions of each component do not fully reflect their actual dimensions. Where a specific description of a relevant known function or configuration would unnecessarily obscure the gist of the invention, such description is omitted.

[0031] Figure 1 is a schematic perspective view of the main components of a battery pack according to one embodiment of the present invention, Figure 2 is an exploded perspective view of Figure 1, and Figure 3 is a perspective view of the battery pack according to one embodiment of the present invention with the top cover plate removed.

[0032] Referring to Figures 1 to 3, a battery pack 10 according to one embodiment of the present invention may include a cell array structure 100 containing a plurality of battery cells 112, a pack case 200 housing the cell array structure 100, a busbar assembly 300 positioned on top of the cell array structure 100, a top cover plate 230, and a fixing portion 400 provided at the point where the cell array structure 100 and the pack case 200 face each other.

[0033] Referring primarily to Figure 2, the cell array structure 100 can include a plurality of battery cells 112.

[0034] The plurality of battery cells 112 are secondary batteries and can be provided as cylindrical secondary batteries, pouch-type secondary batteries, or prismatic secondary batteries. In this embodiment, the description will be limited to the case where the plurality of battery cells 112 are provided as cylindrical secondary batteries. Such battery cells 112 may be a plurality of cylindrical secondary batteries arranged horizontally and standing upright in the vertical direction.

[0035] Multiple battery cells 112, positioned in this manner, can be stacked horizontally or on a horizontal plane (XY plane), as shown in Figure 2. Furthermore, cooling structures can be interposed between each of the battery cells 112, or structures (such as the side frames 130 described later) can be connected to maintain the spacing between the battery cells 112, forming a cell array structure 100, which is an assembly of single battery cells 112.

[0036] Here, the cell array structure 100 may be a single assembly (structure) provided in the shape of a flat plate having a predetermined thickness (for example, the height of the battery cell 112), although this will be described in detail later. Furthermore, the cell array structure 100 may be made larger in area and its weight may also be increased. Such a large-area single structure can ensure a predetermined structural rigidity. As a result, the cell array structure 100 may be a cell-to-pack configuration.

[0037] The pack case 200 can accommodate the cell array structure 100. As shown in Figures 2 and 3, the pack case 200 may include a bottom plate 210, an outer side wall 220 positioned on the edge of the bottom plate 210, a busbar assembly 300 positioned on top of the cell array structure 100, and a top cover plate 230. Here, the cell array structure 100 can be accommodated in the internal space formed by the bottom plate 210, the outer side wall 220, and the top cover plate 230.

[0038] The bottom plate 210 may be positioned below the cell array structure 100. The bottom plate 210 can support the cell array structure 100 facing each other at the bottom. The bottom plate 210 may include a protrusion 211 and a recess 212.

[0039] The outer sidewall 220 refers to a type of frame having a predetermined height and positioned on the outer edge, to which the bottom plate 210 may be attached to the lower part of the outer sidewall 220. The outer sidewall 220 is provided with a hollow interior and may be provided with a plurality of reinforcing partitions 221 (see Figures 10 and 11).

[0040] The busbar assembly 300 is positioned on top of the cell array structure 100 and can electrically connect the multiple battery cells 112. The top cover plate 230 is positioned in the upper region of the pack case 200 and can cover the cell array structure 100 from above.

[0041] Figure 4 is an enlarged perspective view of the bottom plate and outer side wall in Figure 2, Figure 5 is a top view of Figure 4, and Figure 6 is an enlarged perspective view of the side frame portion in Figure 2.

[0042] Referring to Figures 4 to 6 and Figure 2 above, the fixing portion 400 may be provided at the opposing portion between the cell array structure 100 and the pack case 200. The fixing portion 400 may consist of a protruding structure provided on either the cell array structure 100 or the pack case 200, and a recessed structure provided on the other of the cell array structure 100 or the pack case 200. Furthermore, the protruding structure and the recessed structure may be joined together by shape coupling.

[0043] The fixing portion 400 may include a fastening projection 410 provided on either the cell array structure 100 or the outer side wall 220, and a fastening receiving groove 420 provided on the other of the cell array structure 100 or the outer side wall 220.

[0044] As an example, the fastening projection 410 may be provided on the inner wall of the outer side wall 220. The fastening projection 410 may be provided in the middle of the inner wall of the outer side wall 220. The fastening projection 410 is shaped-coupled with the fastening housing groove 420, and a portion of the fastening housing groove 420 can be mounted on it.

[0045] Furthermore, the fastening accommodating groove 420 may be provided in the cell array structure 100. The fastening accommodating groove 420 may be formed on the sidewall 132, which is the outermost surface of the cell array structure 100, and may be formed in a position facing the fastening projection 410. In particular, the fastening accommodating groove 420 may be formed in an area of ​​the cell array structure 100 where one battery cell 112 and another adjacent battery cell 112 are arranged side by side without interference, a so-called empty space.

[0046] As a result, when the cell array structure 100 is assembled into the pack case 200, the protruding structure (fastening protrusion 410 in this embodiment) provided on the inner wall of the outer side wall 220 and the recessed structure (fastening housing groove 420 in this embodiment) formed in the empty space between the battery cells 112 can be coupled to each other in shape.

[0047] According to this embodiment, the protruding structure provided on the inner wall of the pack case 200 and the recessed structure formed in the empty space between the battery cells 112 are arranged to be shape-coupled to each other, optimizing the mounting structure of the cell array structure 100 to the pack case 200, thereby increasing the energy density of the battery pack 10. This eliminates the need for a separate mounting structure on the pack case 200 (such as a further protruding flange configuration) that was necessary to fix the conventional cell array structure, and allows for the accommodation of more battery cells 112 by the space occupied by the eliminated mounting structure. Alternatively, it is possible to increase the capacity of battery cells 112 per unit volume of the battery pack 10.

[0048] Furthermore, the fastening housing groove 420 is inserted into the fastening projection 410, and a portion of the fastening housing groove 420 is securely attached to the fastening projection 410, mounting and supporting it, thereby enabling a strong bond between the pack case 200 and the cell array structure 100. This allows the cell array structure 100 to be more firmly fixed on the pack case 200, in response to the trend of the cell array structure 100 becoming larger in area and heavier.

[0049] The cell array structure 100 and the fixing part 400 according to one embodiment of the present invention will be described in more detail below.

[0050] Figure 7 shows a cell array structure applied to a battery pack according to one embodiment of the present invention, Figure 8 is a combined perspective view of the components of Figure 7, and Figure 9 shows a portion of the upper part of the cell array structure housed in the battery pack according to one embodiment of the present invention.

[0051] Referring to Figures 7 to 9 and Figure 2 above, the cell array structure 100 may include a plurality of unit cell groups 110, each including a plurality of battery cells 112 and a plurality of cooling tubes 115 attached to the plurality of battery cells 112, and a side frame 130 positioned between the plurality of unit cell groups 110.

[0052] The battery cell 112 may have a tab portion 113 and an upper surface 114 at its top. The tab portion 113 has a first polarity, and the upper surface 114 has a second polarity, and the tab portion 113 and the upper surface 114 may be electrically insulated from each other. The first polarity may be the positive electrode of the battery cell 112, and the second polarity may be the negative electrode of the battery cell 112. That is, the tab portion 113 may be the positive electrode portion of the battery cell 112, and the upper surface 114 may be the negative electrode portion of the battery cell 112. The tab portion 113 may be provided so as to protrude beyond the upper surface 114. Alternatively, the tab portion 113 may be configured so as not to protrude beyond the upper surface 114. For example, it may be a so-called tab-less structure in which the tab portion 113 is arranged in the same plane as the upper surface. Since such configurations of battery cells 112 were widely known to those skilled in the art at the time of filing of the present invention, further detailed explanation is omitted in this specification.

[0053] Multiple such battery cells 112 can be combined to form a single cell array 111. That is, multiple cell arrays 111 can be arranged in a line along the length direction (X-axis direction) of the battery pack 10. The number of battery cells 112 forming the cell array 111 is not limited.

[0054] Furthermore, the unit cell group 110 may include a cooling tube 115 between the pair of cell arrays 111. That is, the unit cell group 110 may include a pair (two) of cell arrays 111 and a cooling tube 115 interposed between the pair of cell arrays 111. Here, the cooling tube 115 is a portion that cools the battery cells 112 facing each other on one surface of the cell array 111. The cooling tube 115 has an empty space through which a cooling medium flows, and since it is provided facing each other on the outer surfaces of a plurality of battery cells 112, the heat generated in the battery cells 112 can be directly transmitted to the cooling medium.

[0055] Such a unit cell group 110 inevitably forms a curved section because multiple battery cells 112 are located on the outer surface. Therefore, the cell array structure 100 can be provided with a side frame 130 that maintains and fixes the spacing between the multiple battery cells 112 while accommodating the curved section.

[0056] The side frame 130 may be provided between the unit cell group 110 and an adjacent unit cell group 110, or at the leading edge of the unit cell group 110. Specifically, the side frame 130 may include a side structure 131 interposed between the unit cell groups 110, and a side wall 132 interposed between the pack case 200 and the unit cell group 110.

[0057] The side structure 131 may be positioned between a pair of unit cell groups 110. The side structure 131 is positioned between one unit cell group 110 and an adjacent unit cell group 110, and can fix at least one pair of unit cell groups 110 and maintain the spacing between battery cells 112. The side structure 131 may be provided with grooves 131a on one longitudinal surface and the other surface, respectively, corresponding to the shape of the outer surface of the unit cell group 110. The curvature and number of the inner grooves 131a can be determined according to the specifications of the outer surface of the unit cell group 110 or battery cell 112 that is shape-coupled to the side structure 131.

[0058] A pair of sidewalls 132 may be arranged on both sides in the assembly direction (Y-axis direction) in which the unit cell group 110 and the side structure 131 are assembled. The sidewalls 132 may be provided on the outermost side in the width direction (X-axis direction) of the cell array structure 100. One surface of the sidewall 132 has the aforementioned groove portion 133 formed thereon to accommodate one surface of the unit cell group 110, while the other surface (opposite side) is formed flat and may be provided so as to face the outer sidewall 220 of the pack case 200. This allows the cell array structure 100 and the outer sidewall 220 to face each other and prevents the formation of unnecessary gaps.

[0059] In this way, multiple unit cell groups 110 and multiple side structures 131 and side walls 132 can be assembled to create a single cell array structure 100. A cell array structure 100 with this configuration does not require a separate module case and can be a structure that ensures structural rigidity.

[0060] Specifically, the side frames 130 can be positioned between each of the multiple battery cells 112 within the cell array structure 100, or on one side of the cell array 111, to fix and support the multiple battery cells 112. Furthermore, the side frames 130 can be attached to the multiple battery cells 112 to form a single structure as the cell array structure 100, which can be made larger in area and heavier than conventional structures.

[0061] Referring to Figure 8 and Figures 4 to 6 described above, the fixing portion 400 may include a fastening projection 410 provided on any one of the outer side walls 220 and a fastening receiving groove 420 provided on the cell array structure 100.

[0062] The fastening projection 410 is provided on the inner wall of the outer sidewall 220 and may be provided in the central area in the thickness direction of the outer sidewall 220. The fastening projection 410 may also be provided so as to have a triangular cross-section. In such a fastening projection 410, a fastening hole 416 is formed in the vertical direction, and a fastening member 430 can be connected to the fastening hole 416.

[0063] The fastening receiving groove 420 is provided along the thickness direction of the side wall 132 and may include an inner recessed groove 421 formed on one surface of the side wall 132 and a mounting step 425 provided so as to protrude from the inner recessed groove 421.

[0064] The inner recessed groove 421 may be provided in a triangular shape, corresponding to the shape of the fastening projection 410. That is, the inner recessed groove 421 may be formed in a triangular shape, with the vertex of the upper end of the triangle facing the thickness direction of the sidewall 132. Furthermore, the inner recessed groove 421 may be formed continuously in the thickness direction of the sidewall 132 from the upper end to the lower end of the sidewall 132.

[0065] The inner recessed groove 421 can be formed in an area where, when the cell array structure 100 is viewed from above, one battery cell 112 and another adjacent battery cell 112 are positioned side by side without interference. In other words, the inner recessed groove 421 can be formed in an empty space, known as idle space (buffer space), between one battery cell 112 and an adjacent battery cell 112. This is advantageous in terms of energy density compared to conventional structures where a separate additional mounting space is provided.

[0066] The mounting step 425 may be provided in the intermediate area of ​​the inner recessed groove 421. The mounting step 425 may be provided so as to protrude outward from the triangular recessed structure of the inner recessed groove 421. The mounting step 425 can be fixed to the upper surface of the fastening projection 410, and the cell array structure 100 can be mounted and supported on the pack case 200. Fastening holes 426 can be formed in the vertical direction in such a mounting step 425.

[0067] According to this embodiment, the protruding structure provided on the inner wall of the outer sidewall 220 and the recessed structure formed in the empty space between the battery cells 112 are shape-coupled to each other, thereby optimizing the mounting structure of the cell array structure 100 to the pack case 200 and increasing the energy density of the battery pack 10.

[0068] Furthermore, according to this embodiment, a strong bonding force is ensured between the pack case 200 and the cell array structure 100, allowing the cell array structure 100, which tends to be larger in area and heavier, to be firmly fixed onto the pack case 200. Because the fixing part 400 can firmly support the cell array structure 100, which is larger in area than conventional designs, it can withstand vibrations and external shocks.

[0069] Furthermore, the recessed structure of the cell array structure 100 can be mounted and connected to the protruding structure of the pack case 200 by sliding it into place, thereby improving the ease of assembling the pack.

[0070] Furthermore, because the cell array structure 100 is firmly fixed to the pack case 200, problems such as deformation of the cell array structure 100 itself, warping due to external impacts, detachment of electrical connection wires, and short circuits that may occur due to positional changes can be greatly reduced, and the risk of cracks or damage at the mounting point between the cell array structure 100 and the pack case 200 can also be reduced.

[0071] The following explains the bonding process.

[0072] Figure 10 is a cross-sectional perspective view of the line A-A' in Figure 9, and Figure 11 is a longitudinal cross-sectional view of a battery pack according to one embodiment of the present invention.

[0073] The pack case 200 is positioned, and the cell array structure 100 moves downward on the upper side.

[0074] When the fastening projection 410 is inserted into the fastening receiving groove 420, the cell array structure 100 slides downward.

[0075] The mounting step 425 may be provided so as to protrude outward from one section of the inner recessed groove 421. As a result, when the cell array structure 100 slides downward and is coupled to the pack case 200, the mounting step 425 securely attaches to the fastening projection 410.

[0076] As shown in Figures 10 and 11, fastening holes 416 and 426 are formed in the fastening projection 410 and the mounting step 425 in the vertical direction, and fastening members 430 are connected to the fastening holes 416 and 426.

[0077] As a result, the protruding structure provided on the inner wall of the outer sidewall 220 and the recessed structure formed in the empty space between the battery cells 112 are shape-coupled to each other, optimizing the mounting structure of the cell array structure 100 to the pack case 200 and increasing the energy density of the battery pack 10.

[0078] Furthermore, according to this embodiment, a strong bonding force is ensured between the pack case 200 and the cell array structure 100, allowing the cell array structure 100, which tends to be larger in area and heavier, to be firmly fixed onto the pack case 200. Because the fixing part 400 can firmly support the cell array structure 100, which is larger in area than conventional designs, it can withstand vibrations and external shocks.

[0079] Furthermore, the recessed structure of the cell array structure 100 can be mounted and connected to the protruding structure of the pack case 200 by sliding it into place, thereby improving the ease of assembling the pack.

[0080] On the other hand, the battery pack 10 according to one embodiment of the present invention may further include various devices for controlling the charging and discharging of the battery cells 112, such as a battery management system (BMS), a current sensor, a fuse, etc., although these are not shown in the figures.

[0081] Figure 12 is a diagram illustrating an automobile according to one embodiment of the present invention.

[0082] Referring to Figure 12, the battery pack 10 according to one embodiment of the present invention can be applied to an automobile V such as an electric vehicle or a hybrid vehicle. That is, an automobile V according to one embodiment of the present invention may include the battery pack 10 according to one embodiment of the present invention. The battery pack 10 is installed in the vehicle body frame under the seats or in the trunk space of the vehicle, and when installing it in the vehicle, the battery pack 10 can be installed in reverse order as needed.

[0083] In this specification, terms indicating directions such as up, down, left, right, front, and back are used, but such terms are for explanatory convenience and it will be obvious to those skilled in the art that they may change depending on the position of the object in question, the position of the observer, etc.

[0084] Although the present invention has been described above with reference to limited embodiments and drawings, it goes without saying that the present invention is not limited thereto, and various modifications and variations are possible within the equivalent scope of the technical idea of ​​the present invention and the claims described below by persons with ordinary skill in the art to which the present invention pertains. [Explanation of symbols]

[0085] 100: Cell array structure 110: Unit Cell Group 111: Cell Array 112: Battery cell 115: Cooling tube 130: Side frame 131: Side Structure 132: Sidewall 200: Pack Case 210: Bottom plate 220: Outer sidewall 221: Reinforced bulkhead 230: Top cover plate 300: Busbar Assembly 400: Fixed part 410: Fastening protrusion 416: Fastening hole 420: Fastening housing groove 421: Internal depression groove 425: Mounting step 426: Fastening hole 430: Fastening member

Claims

1. A cell array structure containing multiple battery cells, A pack case for housing the aforementioned cell array structure, A fixing portion is provided at the opposing portion between the cell array structure and the pack case, and fixes the cell array structure to the pack case by mutual shape coupling, A battery pack, including the battery pack.

2. The battery pack according to claim 1, wherein the fixing portion is configured such that a protruding structure provided on either the cell array structure or the pack case and a recessed structure provided on the other of the cell array structure or the pack case are shaped to connect with each other.

3. The aforementioned pack case is A bottom plate is positioned at the lower part of the cell array structure, An outer side wall positioned on the outer edge of the bottom plate, Includes, The battery pack according to claim 1, wherein the fixing portion is provided on the outermost surface portion of the cell array structure and on the inner wall of the outer side wall.

4. The aforementioned fixing part is A fastening projection provided on either the cell array structure or the outer side wall, A fastening accommodating groove provided in either the cell array structure or the outer side wall, The battery pack according to claim 3, including the following:

5. The aforementioned cell array structure is Multiple unit cell groups including multiple battery cells, A side frame positioned between multiple unit cell groups, Includes, The aforementioned side frame is A side structure interposed between the aforementioned unit cell groups, A side wall interposed between the pack case and the unit cell group, Includes, The fastening projection is provided on the outer side wall. The battery pack according to claim 4, wherein the fastening and receiving groove portion is provided in the side wall.

6. The fastening receiving groove portion is, An inner recessed groove is provided along the thickness direction of the sidewall and formed on one surface of the sidewall, A mounting step is provided so as to protrude from the aforementioned inner recessed groove, The battery pack according to claim 5, including the following:

7. The battery pack according to claim 6, wherein when the cell array structure is coupled to the pack case, the fastening protrusion is securely attached to and supported by the mounting step.

8. The battery pack according to claim 4, wherein the fastening projection is provided such that its cross-section protrudes in a triangular shape.

9. The battery pack according to claim 6, wherein the inner recessed groove is provided in a triangular shape corresponding to the shape of the fastening projection.

10. The battery pack according to claim 6, wherein the inner recessed groove is formed in an area where, when the cell array structure is viewed from above, one battery cell and another adjacent battery cell are arranged side by side without interference.

11. The battery pack according to claim 6, wherein the cell array structure slides downward when the fastening projection is inserted into the fastening housing groove, and is mounted and supported on the pack case.

12. A fastening hole is formed in the fastening projection and the mounting step in the vertical direction. The battery pack according to claim 6, wherein a fastening member is connected to the fastening hole.

13. An automobile comprising a battery pack according to any one of claims 1 to 12.

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