Battery pack and vehicle including the same

Abstract

The battery pack according to the present invention may comprise: a cell array structure comprising a plurality of battery cells; the battery pack shell is used for accommodating the battery cell array structure; and a fixing portion provided at an interface between the cell array structure and the battery pack case to fix the cell array structure to the battery pack case through an interlocking connection.

Description

Technical Field

[0001] The present disclosure relates to a battery pack and a vehicle including the same, and more particularly to a battery pack in which a cell array structure is mounted in a battery pack case using empty spaces between battery cells to increase the energy density of the battery pack, and a vehicle including the same. This application is based on and claims priority from Korean Patent Application No. 10-2023-0123394 filed in the Korean Intellectual Property Office on September 15, 2023, the disclosure of which is incorporated herein by reference in its entirety. Background Art

[0002] Because they are easy to apply to different types of products and have electrical properties such as high energy density, secondary batteries are not only commonly used in portable devices, but also in electric vehicles (EV) or hybrid electric vehicles (HEV) powered by power supplies. Secondary batteries can significantly reduce the use of fossil fuels. In addition to these main advantages, another advantage is that they do not produce by-products due to the use of energy. Due to these advantages, secondary batteries are gaining attention as a new eco-friendly and efficient energy source.

[0003] Currently, widely used secondary battery types include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and the like. A unit secondary battery cell, or unit battery cell, has an operating voltage of approximately 2.5V to 4.5V. Therefore, when a higher output voltage is required, multiple battery cells can be connected in series to form a battery pack. Alternatively, a battery pack can be formed by connecting multiple battery cells in parallel according to the desired charge / discharge capacity of the battery pack. Therefore, the number of battery cells included in the battery pack and the type of electrical connection can be set in various ways depending on the desired output voltage and / or charge / discharge capacity.

[0004] Meanwhile, lithium-ion secondary batteries can be classified into pouch-type secondary batteries and can-type secondary batteries based on the shape of the battery case. In pouch-type secondary batteries, the electrode assembly is contained in a pouch of aluminum laminate, while in can-type secondary batteries, the electrode assembly is contained in a metal can. In addition, can-type secondary batteries can be further subdivided into cylindrical batteries and square batteries based on the shape of the metal can.

[0005] In particular, to provide high voltage and high current, cylindrical batteries are formed into battery modules or battery packs by stacking or stacking multiple battery cells with or without a case to form at least one unit structure (e.g., a cell to battery pack structure), establishing electrical connections, and encapsulating in a battery pack housing.

[0006] To keep pace with the recent trend toward higher density in battery packs, unit structures comprising multiple battery cells are increasing in size and weight. Consequently, improvements are needed to securely attach the unit structure to the battery pack housing. In particular, optimizing the mounting structure and shape is required to maximize cell capacity per unit volume and improve assembly efficiency, particularly in terms of energy density (E / D). Summary of the Invention

[0007] Technical issues

[0008] The present disclosure is designed to solve the above-mentioned problems, and therefore the present disclosure is committed to providing a battery pack in which the protruding structure on the inner wall of the battery pack shell and the recessed structure in the empty space between the battery cells are matched with each other in shape, thereby optimizing the mounting structure for mounting the cell array structure in the battery pack shell and thereby increasing the energy density of the battery pack.

[0009] The technical problems to be solved by the present disclosure are not limited to the above-mentioned problems, and those skilled in the art will clearly understand these and other problems from the following description.

[0010] Technical Solution

[0011] According to the present disclosure, a battery pack may include: a cell array structure including a plurality of battery cells; a battery pack shell that accommodates the cell array structure; and a fixing portion that is arranged at a position where the cell array structure and the battery pack shell face each other and is configured to fix the cell array structure to the battery pack shell through a shape-fitting connection.

[0012] The fixing portion may include a protruding structure in any one of the cell array structure or the battery pack case and a recessed structure in the other of the cell array structure or the battery pack case, and the protruding structure and the recessed structure may be shape-matched with each other.

[0013] The battery pack case may include a bottom plate disposed below the cell array structure; and an outer sidewall disposed at an outer edge of the bottom plate, and the fixing portion may be disposed on the outermost side of the cell array structure and an inner wall of the outer sidewall.

[0014] The fixing portion may include a fastening protrusion portion in any one of the battery cell array structure or the outer sidewall; and a fastening groove portion in the other one of the battery cell array structure or the outer sidewall.

[0015] The cell array structure may include: a plurality of unit cell groups including the plurality of battery cells; and a side frame, wherein the side frame is arranged between the plurality of unit cell groups, and the side frame may include: a side structure, wherein the side structure is inserted between the unit cell groups; and a side wall, wherein the side wall is inserted between the battery pack housing and the unit cell groups, the fastening protrusion may be arranged in the outer side wall, and the fastening groove portion may be arranged in the side wall.

[0016] The fastening groove portion may include an inwardly recessed groove formed on one surface of the side wall along a thickness direction of the side wall; and a mounting step protruding in the inwardly recessed groove.

[0017] When the battery cell array structure is coupled to the battery pack case, the fastening protrusion may be mounted on and supported by the mounting step.

[0018] A horizontal cross-section of the fastening protrusion may protrude in a triangular shape.

[0019] The inwardly concave groove may be concave in a triangular shape to conform to the shape of the fastening protrusion.

[0020] When the battery cell array structure is viewed from the top, the inwardly concave groove may be formed at a region that does not interfere with a position where any one battery cell and other adjacent battery cells are arranged side by side.

[0021] As the fastening protrusion portion is inserted into the fastening groove portion, the battery cell array structure may be slidably moved downward and mounted and supported on the battery pack case.

[0022] The fastening protrusion and the mounting step may have fastening holes in a longitudinal direction, and the fastening member may be coupled to the fastening holes.

[0023] In addition, according to the present disclosure, a vehicle including the above-mentioned battery pack is provided.

[0024] Beneficial effects

[0025] According to one aspect of the present disclosure, since the protruding structure on the inner wall of the battery pack housing and the recessed structure in the empty space between the battery cells are shaped to fit each other, the mounting structure for mounting the cell array structure in the battery pack housing can be optimized, thereby increasing the energy density of the battery pack.

[0026] In addition, according to one aspect of the present disclosure, a strong connection strength between the battery pack housing and the cell array structure can be ensured, thereby firmly fixing the cell array structure to the battery pack housing to keep up with the trend of cell array structures toward larger areas and higher weights.

[0027] In addition, according to one aspect of the present disclosure, since mounting and coupling operations may be performed through slidable coupling between the concave structure of the battery cell array structure and the protruding structure of the pack case, assembly efficiency of the battery pack may be improved.

[0028] The effects of the present disclosure are not limited to the above-described effects, and those skilled in the art will clearly understand these and other effects based on the present disclosure and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the following detailed description, serve to provide a better understanding of the technical aspects of the present disclosure; therefore, the present disclosure should not be construed as limited to the accompanying drawings.

[0030] Figure 1 is a schematic perspective view of main components of a battery pack according to an embodiment of the present disclosure.

[0031] Figure 2 yes Figure 1 Exploded three-dimensional diagram.

[0032] Figure 3 is a perspective view of a battery pack according to an embodiment of the present disclosure from which a top cover plate is removed.

[0033] Figure 4 yes Figure 2 An enlarged perspective view of the battery pack housing in FIG.

[0034] Figure 5 yes Figure 4 Top view of .

[0035] Figure 6 yes Figure 2 A partial enlarged perspective view of the side frame in FIG.

[0036] Figure 7 FIG. 1 is a schematic diagram of a cell array structure applied to a battery pack according to an embodiment of the present disclosure.

[0037] Figure 8 yes Figure 7 Assembly stereogram.

[0038] Figure 9 is a partial top view of a battery cell array structure received in a battery pack according to an embodiment of the present disclosure.

[0039] Figure 10 It is taken along line A-A' Figure 9 A sectional perspective view of .

[0040] Figure 11 is a longitudinal sectional view of a battery pack according to an embodiment of the present disclosure.

[0041] Figure 12 is a diagram illustrating a vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terms or words used in the specification and the appended claims should not be interpreted as limited to the general meaning and dictionary meaning, but should be interpreted according to the meaning and concept corresponding to the technical aspects of the present disclosure based on the principle of allowing the inventor to appropriately define the terms for the best interpretation.

[0043] Therefore, the description provided herein and the illustrations in the accompanying drawings are provided to describe some exemplary embodiments of the present disclosure, but are not intended to fully describe the technical aspects of the present disclosure, and it should be understood that various other equivalents and modifications may be made thereto when a patent application is filed.

[0044] In the accompanying drawings, for the convenience and clarity of description, the size of each element or a specific portion of an element is exaggerated, omitted, or schematically shown. Therefore, the size of each element does not exactly reflect the actual size. When it is determined that a detailed description of a related known function or element may unnecessarily obscure the subject matter of the present disclosure, the description is omitted.

[0045] Figure 1 is a schematic perspective view of main components of a battery pack according to an embodiment of the present disclosure, Figure 2 yes Figure 1 , and Figure 3 is a perspective view of a battery pack according to an embodiment of the present disclosure from which a top cover plate is removed.

[0046] Reference Figures 1 to 3 , a battery pack 10 according to an embodiment of the present disclosure may include: a battery cell array structure 100, which includes a plurality of battery cells 112; a battery pack housing 200, which accommodates the battery cell array structure 100; a bus bar assembly 300, which is arranged on the battery cell array structure 100; a top cover plate 230; and a fixing portion 400, which is arranged at a position where the battery cell array structure 100 and the battery pack housing 200 face each other.

[0047] Main reference Figure 2 , the battery cell array structure 100 may include a plurality of battery cells 112 .

[0048] The plurality of battery cells 112 may include secondary batteries, such as cylindrical secondary batteries, pouch-type secondary batteries, or square-type secondary batteries. Hereinafter, the embodiment will be described based on cylindrical secondary batteries as the plurality of battery cells 112. The battery cells 112 may be a plurality of cylindrical secondary batteries arranged in a horizontal direction and standing upright in a vertical direction.

[0049] The plurality of upright battery cells 112 may be stacked in a horizontal direction or on a horizontal plane (XY plane), such as Figure 2 In addition, a structure for maintaining spacing between the battery cells 112 (such as the side frame 130 described below) or a cooling structure may be provided or coupled between each of the plurality of battery cells 112 to form a cell array structure 100 as an assembly of the battery cells 112 .

[0050] Here, the cell array structure 100 can be a single component (structure) of a flat plate type having a predetermined thickness (e.g., the height of the battery cell 112), as described in detail below. In addition, the area of the cell array structure 100 can be increased, and the weight of the cell array structure 100 can be increased. The single large-area structure can have a predetermined structural strength. Therefore, the cell array structure 100 can be a component of a battery cell to a battery pack.

[0051] The battery pack housing 200 can accommodate the battery cell array structure 100. Figure 2 and Figure 3 As shown, the battery pack housing 200 may include a bottom plate 210, an outer sidewall 220 provided at an edge of the bottom plate 210, a bus bar assembly 300 provided on the battery cell array structure 100, and a top cover plate 230. Here, the battery cell array structure 100 may be received in an internal space formed by the bottom plate 210, the outer sidewall 220, and the top cover plate 230.

[0052] The bottom plate 210 may be disposed below the cell array structure 100. The bottom plate 210 may contact and support the bottom of the cell array structure 100. The bottom plate 210 may include a convex portion 211 and a concave portion 212.

[0053] The outer side wall 220 refers to a frame having a predetermined height provided at the outer edge, and the bottom plate 210 may be coupled to the bottom of the outer side wall 220. The outer side wall 220 may be hollow and may have a plurality of reinforcement partitions 221 (see Figure 10 、 Figure 11 ).

[0054] The bus bar assembly 300 may be disposed on the cell array structure 100 and configured to electrically connect the plurality of battery cells 112 . In addition, the top cover plate 230 may be disposed on top of the battery pack case 200 and configured to cover the upper surface of the cell array structure 100 .

[0055] Figure 4 yes Figure 2 An enlarged perspective view of the bottom plate and outer side wall in FIG. Figure 5 yes Figure 4 A top view of Figure 6 yes Figure 2 A partial enlarged perspective view of the side frame in FIG.

[0056] Reference Figures 4 to 6 as well as Figure 2 The fixing portion 400 may be provided at a position where the battery cell array structure 100 and the battery pack housing 200 face each other. The fixing portion 400 may include a protruding structure in either the battery cell array structure 100 or the battery pack housing 200, and a recessed structure in the other of the battery cell array structure 100 or the battery pack housing 200. Furthermore, the protruding structure and the recessed structure may be shaped to fit each other.

[0057] The fixing portion 400 may include a fastening protrusion portion 410 in any one of the battery cell array structure 100 or the outer sidewall 220 , and a fastening groove portion 420 in the other one of the battery cell array structure 100 or the outer sidewall 220 .

[0058] For example, the fastening protrusion 410 may be provided at the inner wall of the outer sidewall 220. The fastening protrusion 410 may be provided at the middle of the inner wall of the outer sidewall 220. The fastening protrusion 410 may be form-fitted to the fastening groove portion 420 and configured to fit a portion of the fastening groove portion 420.

[0059] In addition, a fastening groove portion 420 may be provided at the battery cell array structure 100. The fastening groove portion 420 may be formed at the sidewall 132 on the outermost side of the battery cell array structure 100 and may be disposed opposite the fastening protrusion 410. In particular, the fastening groove portion 420 may be formed in a so-called empty space in the battery cell array structure 100 that does not interfere with the position where any one battery cell 112 and its adjacent other battery cells 112 are arranged side by side.

[0060] Therefore, when the battery cell array structure 100 is assembled with the battery pack housing 200, the protruding structure on the inner wall of the outer wall 220 (the fastening protruding portion 410 in this embodiment) and the recessed structure in the empty space between the battery cells 112 (the fastening groove portion 420 in this embodiment) can be shaped to fit each other.

[0061] According to this embodiment, because the protruding structures on the inner wall of the battery pack housing 200 and the recessed structures in the empty spaces between the battery cells 112 are form-fitted to each other, the mounting structure for mounting the battery cell array structure 100 in the battery pack housing 200 can be optimized, thereby increasing the energy density of the battery pack 10. This can eliminate the need for mounting structures (flanges, etc.) on the battery pack housing 200 for securing the battery cell array structure, and can accommodate more battery cells 112 in the same amount as the space occupied by the removed mounting structures. Alternatively, for the same volume of the battery pack 10, the capacity of the battery cells 112 can be increased.

[0062] In addition, when the fastening groove portion 420 is inserted into the fastening protrusion portion 410 and a portion of the fastening groove portion 420 is mounted and supported on the fastening protrusion portion 410, the battery pack case 200 and the battery cell array structure 100 can be strongly coupled to each other. In order to keep up with the trend of the battery cell array structure 100 toward a larger area and higher weight, the battery cell array structure 100 can be more firmly fixed to the battery pack case 200.

[0063] Hereinafter, the battery cell array structure 100 and the fixing portion 400 according to an embodiment of the present disclosure will be described in more detail.

[0064] Figure 7 is a diagram of a cell array structure applied to a battery pack according to an embodiment of the present disclosure, Figure 8 yes Figure 7 Assembly stereogram of Figure 9 is a partial top view of a battery cell array structure received in a battery pack according to an embodiment of the present disclosure.

[0065] refer to Figures 7 to 9 as well as Figure 2 The cell array structure 100 may include a plurality of unit cell groups 110 and side frames 130 disposed between the plurality of unit cell groups 110 , the unit cell groups 110 including a plurality of battery cells 112 and cooling pipes 115 attached to the plurality of battery cells 112 .

[0066] The battery cell 112 may have a joint portion 113 and an upper surface 114 on the top. The joint portion 113 may have a first polarity, and the upper surface 114 may have a second polarity. The joint portion 113 and the upper surface 114 may be electrically isolated from each other. The first polarity may be the positive polarity of the battery cell 112, and the second polarity may be the negative polarity of the battery cell 112. That is, the joint portion 113 may be the positive portion of the battery cell 112, and the upper surface 114 may be the negative portion of the battery cell 112. The joint portion 113 may extend from the upper surface 114. Alternatively, the joint portion 113 may not extend from the upper surface 114. For example, the joint portion 113 may be arranged on the same plane as the upper surface, such as a so-called jointless structure. The components of the battery cell 112 are well known to those skilled in the art at the time of filing this application, and a detailed description thereof is omitted.

[0067] The plurality of battery cells 112 may form a cell array 111. That is, the cell array 111 may include a plurality of battery cells 112 arranged side by side in a row 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 to a specific range.

[0068] In addition, the unit cell group 110 may include a pair of cell arrays 111 and a cooling pipe 115 between the pair of cell arrays 111. That is, the unit cell group 110 may include a pair of (two) cell arrays 111 and a cooling pipe 115 interposed between the pair of cell arrays 111. Here, the cooling pipe 115 cools the battery cells 112 while contacting one surface of the cell array 111. The cooling pipe 115 may be a structure having an empty space in which a cooling medium flows, and may be configured to directly transfer heat from the battery cells 112 to the cooling medium while contacting the outer surfaces of the plurality of battery cells 112.

[0069] Because the plurality of battery cells 112 are disposed on the outside, the unit cell group 110 has a curved shape. Therefore, the cell array structure 100 may include a side frame 130 to adapt to the curved shape and fix the plurality of battery cells 112 while maintaining intervals between the battery cells 112.

[0070] The side frame 130 may be provided between the unit cell group 110 and an adjacent unit cell group 110, or provided at the front end 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 battery pack case 200 and the unit cell group 110.

[0071] The side structure 131 may be provided between a pair of unit cell groups 110. The side structure 131 may be provided between a unit cell group 110 and an adjacent unit cell group 110 to fix at least a pair of unit cell groups 110 and maintain the interval between the battery cells 112. Figure 2 and Figure 3 As shown in FIG, the side structure 131 may have grooves 131 a on each of one surface and the other surface in the length direction to conform to the shape of the outer surface of the unit cell group 110. The inner curvature of the groove 131 a or the number of grooves 131 a may be determined according to the specifications of the outer surface of the battery cell 112 or the unit cell group 110 to which the side structure 131 is to be matched in shape.

[0072] A pair of side walls 132 may be provided 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 side walls 132 may be provided at the outermost side of the cell array structure 100 in the width direction (X-axis direction). One surface of the side wall 132 may have a concave recess 133, in which one surface of the unit cell group 110 is received, and the other surface (opposite surface) may be flat to contact the outer side wall 220 of the battery pack case 200. Therefore, the cell array structure 100 and the outer side wall 220 may contact each other without unnecessary gaps.

[0073] As described above, the plurality of unit cell groups 110, the plurality of side structures 131, and the plurality of side walls 132 may be assembled to form a cell array structure 100. The cell array structure 100 may be a structure having structural strength without any module case.

[0074] Specifically, the side frame 130 may be provided for each of the plurality of battery cells 112 in the battery cell array structure 100, or may be provided on one surface of the battery cell array 111, and may be configured to fix and support the plurality of battery cells 112. Furthermore, the side frame 130 may be attached to the plurality of battery cells 112 to form a structure serving as the battery cell array structure 100, thereby achieving a larger area and higher weight.

[0075] Reference Figure 8 as well as Figures 4 to 6 , the fixing portion 400 may include a fastening protrusion portion 410 in any one of the outer sidewalls 220 and a fastening groove portion 420 in the battery cell array structure 100 .

[0076] The fastening protrusion 410 may be provided on the inner wall of the outer side wall 220 and may be provided at the center portion of the outer side wall 220 in the thickness direction. In addition, the horizontal cross-section of the fastening protrusion 410 may protrude in a triangular shape. The fastening protrusion 410 may have a fastening hole 416 in the longitudinal direction, and the fastening member 430 may be coupled to the fastening hole 416.

[0077] The fastening groove portion 420 may include an inwardly recessed groove 421 on one surface of the sidewall 132 along a thickness direction of the sidewall 132 , and a mounting step 425 protruding in the inwardly recessed groove 421 .

[0078] The inwardly concave groove 421 may be concave in a triangular shape to conform to the shape of the fastening protrusion 410. That is, the inwardly concave groove 421 may be concave in a triangular shape with the top vertex facing the thickness direction of the side wall 132. In addition, the inwardly concave groove 421 may be formed continuously from the top to the bottom of the side wall 132 in the thickness direction of the side wall 132.

[0079] When viewing the battery cell array structure 100 from the top, the inwardly recessed groove 421 can be formed in an area that does not interfere with the position where any one battery cell 112 and its adjacent battery cells 112 are arranged side by side. In other words, the inwardly recessed groove 421 can be formed in an empty space that serves as an unused space (buffer space) between the battery cell 112 and the adjacent battery cell 112. Therefore, compared to a conventional structure with additional installation space, this can have a beneficial effect on energy density.

[0080] The mounting step 425 may be provided in the middle of the inwardly recessed groove 421. The mounting step 425 may protrude outward from the triangular recessed structure of the inwardly recessed groove 421. The mounting step 425 may be mounted on the upper surface of the fastening protrusion 410 and configured to mount and support the cell array structure 100 on the battery pack case 200. The mounting step 425 may have a fastening hole 426 in the longitudinal direction.

[0081] According to this embodiment, since the protruding structure on the inner wall of the outer wall 220 and the recessed structure in the empty space between the battery cells 112 are shaped to fit each other, the mounting structure for mounting the cell array structure 100 in the battery pack housing 200 can be optimized, thereby increasing the energy density of the battery pack 10.

[0082] In addition, according to this embodiment, a strong connection strength between the battery pack case 200 and the battery cell array structure 100 can be ensured, thereby firmly fixing the battery cell array structure 100 to the battery pack case 200, in keeping with the trend toward larger areas and higher weights of the battery cell array structure 100. Since the fixing portion 400 can firmly support the larger area of the battery cell array structure 100, high resistance to vibration or external impact can be ensured.

[0083] In addition, since installation and coupling may be performed through slidable coupling between the recessed structure of the battery cell array structure 100 and the protruding structure of the pack case 200 , assembly efficiency of the battery pack may be improved.

[0084] In addition, since the battery cell array structure 100 is firmly fixed to the battery pack housing 200, the disconnection or short circuit problems of the electrical connection lines that may occur in the event of deformation (such as twisting of the battery cell array structure 100 itself or twisting or dislocation due to external impact) can be significantly reduced, and the risk of cracks or damage at the installation position of the battery cell array structure 100 and the battery pack housing 200 is reduced.

[0085] Hereinafter, the connection process will be described.

[0086] Figure 10 It is taken along line A-A' Figure 9 sectional perspective view, and Figure 11 is a longitudinal sectional view of a battery pack according to an embodiment of the present disclosure.

[0087] The battery pack housing 200 is placed, and the battery cell array structure 100 is moved downward from above.

[0088] As the fastening protrusion portion 410 is inserted into the fastening groove portion 420 , the battery cell array structure 100 is slidably moved downward.

[0089] The mounting step 425 may protrude outward from the inwardly recessed groove 421. Therefore, as the cell array structure 100 slidably moves downward, when the cell array structure 100 is coupled to the battery pack case 200, the mounting step 425 is mounted on the fastening protrusion 410.

[0090] like Figure 10 and Figure 11 As shown, the fastening protrusion 410 and the mounting step 425 have fastening holes 416 , 426 in the longitudinal direction, respectively, and the fastening member 430 is coupled to the fastening holes 416 , 426 .

[0091] Therefore, since the protruding structure on the inner wall of the outer wall 220 and the recessed structure in the empty space between the battery cells 112 are shaped to fit each other, the mounting structure for mounting the cell array structure 100 in the battery pack housing 200 can be optimized, thereby increasing the energy density of the battery pack 10.

[0092] In addition, according to this embodiment, a strong connection strength between the battery pack case 200 and the battery cell array structure 100 can be ensured, thereby firmly fixing the battery cell array structure 100 to the battery pack case 200, in order to keep up with the trend toward larger areas and higher weights of the battery cell array structure 100. Since the fixing portion 400 can firmly support the larger area of the battery cell array structure 100, resistance to vibration or external impact can be ensured.

[0093] In addition, since the mounting and coupling operations may be performed through the slidable coupling between the recessed structure of the battery cell array structure 100 and the protruding structure of the pack case 200 , the assembly efficiency of the battery pack may be improved.

[0094] Although not shown, the battery pack 10 according to the present disclosure may further include various types of devices to control charging and discharging of the battery cells 112 , for example, a battery management system (BMS), a current sensor, a fuse, and the like.

[0095] Figure 12 is a diagram illustrating a vehicle according to an embodiment of the present disclosure.

[0096] Reference Figure 12 The battery pack 10 according to the present disclosure can be applied to a vehicle V such as an electric vehicle or a hybrid electric vehicle. That is, the vehicle V according to the present disclosure can include the battery pack 10 according to the present disclosure. The battery pack 10 can be installed at the vehicle frame under the vehicle seat or the trunk space, and when installed in the vehicle, the battery pack 10 can be placed in reverse order if necessary.

[0097] Terms indicating directions such as up, down, left, right, front, and rear are used for convenience of description, but it is obvious to those skilled in the art that these terms may vary according to positions of the elements or observers.

[0098] Although the present disclosure has been described above with a limited number of embodiments and drawings, the present disclosure is not limited thereto, and it will be apparent to those skilled in the art that various changes and modifications may be made thereto within the technical aspects of the present disclosure and the appended claims and their equivalents.

[0099] [Reference Signs List]

[0100] 100: Cell array structure

[0101] 110: Cell group 111: Cell array

[0102] 112: Battery cell 115: Cooling pipe

[0103] 130: Side frame

[0104] 131: Side structure 132: Side wall

[0105] 200: Battery pack housing 210: Bottom plate

[0106] 220: Outer side wall 221: Reinforced partition

[0107] 230: Top cover

[0108] 300: Busbar assembly

[0109] 400: fixing portion 410: fastening protrusion 416: fastening hole 420: fastening groove portion 421: inwardly concave groove 425: mounting step

[0110] 426: Fastening hole 430: Fastening member

Claims

1. A battery pack, comprising: A battery cell array structure, comprising a plurality of battery cells; A battery pack housing, the battery pack housing accommodating the battery cell array structure; as well as A fixing portion is provided at a position where the battery cell array structure and the battery pack case face each other and is configured to fix the battery cell array structure to the battery pack case through a form-fitting connection.

2. The battery pack according to claim 1, wherein: The fixing portion includes a protruding structure in either the battery cell array structure or the battery pack case and a recessed structure in the other of the battery cell array structure or the battery pack case, and the protruding structure and the recessed structure are shape-matched with each other.

3. The battery pack according to claim 1, wherein: The battery pack housing comprises: a bottom plate, the bottom plate being arranged below the battery cell array structure; and an outer side wall disposed at an outer edge of the bottom plate, and Wherein, the fixing portion is arranged on the outermost side of the battery cell array structure and the inner wall of the outer side wall.

4. The battery pack according to claim 3, wherein: The fixed part includes: a fastening protrusion in either the cell array structure or the outer sidewall; and a fastening groove portion in the other of the battery cell array structure or the outer sidewall.

5. The battery pack according to claim 4, wherein: The battery cell array structure includes: a plurality of unit cell groups including the plurality of battery cells; and A side frame is provided between the plurality of unit cell groups, Wherein, the side frame includes: a side structure interposed between the unit cell groups; and sidewalls, the sidewalls being interposed between the battery pack housing and the unit cell group, wherein the fastening protrusion is provided in the outer side wall, and Wherein, the fastening groove is partially provided in the side wall.

6. The battery pack according to claim 5, wherein: The fastening groove portion comprises: an inwardly concave groove formed on one surface of the side wall along a thickness direction of the side wall; and A mounting step protrudes in the inwardly concave groove.

7. The battery pack according to claim 6, wherein: When the battery cell array structure is coupled to the battery pack case, the fastening protrusion is mounted and supported on the mounting step.

8. The battery pack according to claim 4, wherein: A horizontal cross-section of the fastening protrusion protrudes in a triangular shape.

9. The battery pack according to claim 6, wherein: The inwardly concave groove is concave in a triangular shape to conform to the shape of the fastening protrusion.

10. The battery pack according to claim 6, wherein: When the battery cell array structure is viewed from the top, the inwardly concave groove is formed at a region that does not interfere with a position where any battery cell and other adjacent battery cells are arranged side by side.

11. The battery pack according to claim 6, wherein: As the fastening protrusion is inserted into the fastening groove, the battery cell array structure is slidably moved downward and mounted and supported on the battery pack case.

12. The battery pack according to claim 6, wherein: The fastening protrusion and the mounting step have fastening holes in the longitudinal direction, and wherein a fastening member is coupled to the fastening hole.

13. A vehicle comprising the battery pack according to any one of claims 1 to 12.

Images