Battery pack stack

Abstract

According to exemplary embodiments, a battery pack stack is provided. The battery pack stack may comprise: first to third battery packs sequentially stacked in the vertical direction; a first pack connection bolt for fastening the first and second battery packs; and a second pack connection bolt for fastening the second and third battery packs. The first pack connection bolt and the second pack connection bolt may be misaligned in the vertical direction.

Description

Battery pack stack

[0001] The present invention relates to a battery pack stack. The present application claims the benefit of Korean application No. 10-2025-0047923, filed on April 14, 2025, which is incorporated herein by reference in its entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] The technological development trend for rechargeable batteries in mobility is the improvement of energy density and safety. Here, the energy density of a rechargeable battery is defined as the maximum electrical energy that can be stored by the battery's mass. As high energy density is directly linked to driving efficiency and range in mobility applications, various studies are being conducted to improve this energy density.

[0004] One of the powerful solutions for increasing the energy density of secondary batteries is the modular type battery pack (or cell-to-pack structure). Since the modules covering the battery cells are omitted in the modular type battery pack, the mass of the battery pack can be drastically reduced.

[0005] The problem that the technical concept of the present invention aims to solve is to provide a battery pack stack with improved space utilization, impact resistance, and safety.

[0006] According to exemplary embodiments of the present invention for solving the above-described problem, a battery pack stack is provided. The battery pack stack may include first to third battery packs sequentially stacked in a vertical direction; a first pack connecting bolt for connecting the first and second battery packs; and a second pack connecting bolt for connecting the second and third battery packs. The first pack connecting bolt and the second pack connecting bolt may be staggered in a vertical direction.

[0007] Each of the first to third battery packs may include a base plate; a plurality of battery cell assemblies on the base plate; and a beam on the base plate that separates the plurality of battery cell assemblies. The beams of the first to third battery packs may be aligned in a vertical direction.

[0008] The first pack connecting bolt may be configured to penetrate the beam of the first battery pack and the beam of the second battery pack. The second pack connecting bolt may be configured to penetrate the beam of the second battery pack and the beam of the third battery pack.

[0009] The first pack connecting bolt may be spaced apart from the second pack connecting bolt in the direction of extension of the beam of each of the first to third battery packs.

[0010] The first battery pack may further include a first internal connecting bolt for connecting the beam and the base plate. The second battery pack may further include a second internal connecting bolt for connecting the beam and the base plate. The third battery pack may further include a third internal connecting bolt for connecting the beam and the base plate.

[0011] The first to third internal connecting bolts can be aligned in a vertical direction.

[0012] Each of the first to third internal connecting bolts may be staggered in a vertical direction with respect to the first pack connecting bolt. Each of the first to third internal connecting bolts may be staggered in a vertical direction with respect to the second pack connecting bolt.

[0013] Each of the first to third internal connecting bolts may be spaced apart from the first pack connecting bolt in the direction of extension of the beam of each of the first to third battery packs. Each of the first to third internal connecting bolts may be spaced apart from the second pack connecting bolt in the direction of extension of the beam of each of the first to third battery packs.

[0014] Each of the first to third battery packs may further include a cover having venting holes, which is positioned on top of the plurality of battery cell assemblies. Each of the first to third internal connecting bolts may fasten the base plate, the beam, and the cover.

[0015] The first pack connecting bolt may be spaced apart from the third battery pack in a vertical direction. The second pack connecting bolt may be spaced apart from the first battery pack in a vertical direction.

[0016] The battery pack stack may further include a fourth battery pack on the third battery pack; and a third pack connecting bolt for connecting the third and fourth battery packs. The third pack connecting bolt may be aligned in a vertical direction with the first pack connecting bolt.

[0017] The third pack connecting bolt can be spaced vertically apart from each of the first and second battery packs.

[0018] The vertical length of each of the first and second pack connection bolts may be smaller than the vertical height of the battery pack stack.

[0019] According to exemplary embodiments of the present invention for solving the above-described problem, a method for manufacturing a battery pack stack is provided. The method for manufacturing the battery pack stack may include the steps of: stacking first and second battery packs in a vertical direction; fastening a first pack connecting bolt penetrating the first and second battery packs; stacking a third battery pack on the second battery pack; and fastening a second pack connecting bolt penetrating the second and third battery packs. The first and second pack connecting bolts may be staggered in the vertical direction.

[0020] The above method may further include the step of stacking a fourth battery pack on the third battery pack; and the step of fastening a third pack connecting bolt that penetrates the third and fourth battery packs. The third pack connecting bolt may be aligned in a vertical direction with the first pack connecting bolt, but may be staggered in a vertical direction with the second pack connecting bolt.

[0021] According to exemplary embodiments of the present invention, the space utilization rate within a vehicle can be improved by stacking a plurality of battery packs in a vertical direction. In addition, the impact resistance and safety of the battery pack stack can be enhanced by limiting the length and position of the connecting bolts that fasten the plurality of battery packs.

[0022] The effects obtainable from the exemplary embodiments of the present invention are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects resulting from the implementation of the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0023] FIG. 1 is a perspective view showing a battery pack stack according to exemplary embodiments.

[0024] FIG. 2 is an exploded perspective view showing a battery pack according to exemplary embodiments.

[0025] FIG. 3 is an exploded perspective view showing a battery cell assembly according to exemplary embodiments.

[0026] FIG. 4 is a cross-sectional view showing a battery pack stack according to exemplary embodiments.

[0027] FIG. 5 is a flowchart illustrating a method for manufacturing a battery pack stack according to exemplary embodiments.

[0028] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0029] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0030] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0031] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0032]

[0033] (1st embodiment)

[0034] FIG. 1 is a perspective view showing a battery pack stack (10) according to exemplary embodiments.

[0035] FIG. 2 is an exploded perspective view showing a battery pack (100) according to exemplary embodiments.

[0036] FIG. 3 is an exploded perspective view showing a battery cell assembly (BCA) according to exemplary embodiments.

[0037] FIG. 4 is a cross-sectional view showing a battery pack stack (10) according to exemplary embodiments. FIG. 4 shows a cross-section along A-A' of FIG. 1.

[0038]

[0039] Referring to FIG. 1, the battery pack stack (10) may include first to fourth battery packs (100, 200, 300, 400). The first to fourth battery packs (100, 200, 300, 400) may be sequentially stacked in the Z direction.

[0040] Referring together with FIG. 2, the first battery pack (100) may include base plates (BP1, BP2), a battery cell assembly (BCA), beams (110), a cover (CV), and first internal connecting bolts (150). In FIG. 2, the side plates (SP) of FIG. 1 are omitted from the illustration. The second to fourth battery packs (200, 300, 400) may have the same or similar structure as the first battery pack (100). To avoid redundant descriptions, only the first battery pack (100) will be described below.

[0041] Base plates (BP1, BP2) may be configured to support a battery cell assembly (BCA). FIG. 2 illustrates an embodiment in which the first battery pack (100) includes two battery cell assemblies (BCA), but is not limited thereto. In other embodiments, the number of battery cell assemblies (BCA) may be one or three or more. Two directions substantially parallel to the mounting surface of the base plates (BP1, BP2) are defined as the X direction and the Y direction, and a direction substantially perpendicular to the mounting surface of the base plates (BP1, BP2) is defined as the Z direction. Each of the X direction, the Y direction, and the Z direction may be substantially perpendicular to each other. Unless otherwise noted, the definitions of directions are the same for the following drawings.

[0042] A base plate (BP1) may include an inlet port (IP). A base plate (BP2) may include an outlet port (OP). A base plate (BP1) may include a flow path (IF in FIG. 4) connected to the inlet port (IP). A base plate (BP2) may include a flow path (OF in FIG. 4) connected to the outlet port (OP). The flow paths (IF) and the flow paths (OF) may be connected to each other. Refrigerant introduced into the inlet port (IP) may flow through the flow paths (IF) and the flow paths (OF) and be discharged to the outside through the outlet port (OP).

[0043] The flow paths (IF) and flow paths (OF) can provide a flow path for the refrigerant. The refrigerant can absorb heat generated from the battery cells (BC in FIG. 3) to prevent or mitigate the temperature rise of the battery cells (BC). In one embodiment, the base plate (BP1) may be formed integrally with the base plate (BP2). In another embodiment, the base plate (BP1) may be joined to the base plate (BP2) by means such as welding, bonding, or bolting.

[0044] The battery cell assembly (BCA) may be on base plates (BP1, BP2). Referring together to FIG. 3, the battery cell assembly (BCA) may include a plurality of battery cells (BC), pads (PD), and a bus bar frame assembly (BFA).

[0045] A plurality of battery cells (BC) may be arranged in the X direction. FIG. 3 illustrates an embodiment in which the plurality of battery cells (BC) are pouch-type cells, but is not limited thereto. The technical concept of the present invention is applicable even when the battery cells (BC) are prismatic cells or cylindrical cells.

[0046] Each of the plurality of battery cells (BC) may include an electrode assembly, an electrolyte, and a case covering them. The case may be any one of a pouch case, a cylindrical case, and a prismatic case. The pouch case may include an aluminum laminate sheet. The prismatic case and the cylindrical case may include a metallic material such as aluminum. The prismatic case may have a rectangular prism shape. The cylindrical case may have a cylinder shape.

[0047] An electrode assembly embedded in a case includes an anode, a cathode, and a separator interposed between the anode and the cathode. Depending on the assembly form, the electrode assembly may be either a jelly roll type or a stack type. A jelly roll type electrode assembly may include a wound structure of an anode, a cathode, and a separator interposed between the anode and the cathode. A stack type electrode assembly includes a plurality of anodes, a plurality of cathodes, and a plurality of separators interposed between them, which are sequentially stacked. According to exemplary embodiments, a plurality of battery cells (BC) connected in parallel may form a plurality of banks, and the plurality of banks may be connected in series. Depending on the number of battery cells (BC) included in each of the plurality of banks, the output current of the battery cell assembly (BCA) may be determined. Depending on the number of the plurality of banks connected in series, the output voltage of the battery cell assembly (BCA) may be determined.

[0048] Pads (PDs) may be interposed between multiple battery cells (BCs). The pads (PDs) may include a compressible material. The pads (PDs) may absorb swelling of the multiple battery cells (BCs).

[0049] According to exemplary embodiments, the pads (PDs) may be thermal barriers. According to exemplary embodiments, each of the pads (PDs) may have a high melting temperature and low thermal conductivity. According to exemplary embodiments, each of the pads (PDs) may include a flame-retardant material, such as ceramic and coated glass material. According to exemplary embodiments, the pads (PDs) may be configured to release a fire retarding material and a fire extinguishing agent in the event of a thermal runaway event.

[0050] Bus bar frame assemblies (BFA1, BFA2) can be spaced apart from each other in the Y direction with a plurality of battery cells (BC) in between.

[0051] A bus bar frame assembly (BFA1) may include a bus bar frame, a plurality of bus bars, a pair of terminals (TM), and an insulating cover (not shown). A bus bar frame assembly (BFA2) has a structure substantially identical or similar to that of a bus bar frame assembly (BFA1), except that it does not have terminals (TM). A detailed description of the structure of the bus bar frame assembly (BFA2) will be omitted below, and only the structure of the bus bar frame assembly (BFA1) will be described.

[0052] The bus bar frame may include an insulating material such as plastic. The bus bar frame may cover the front of a plurality of battery cells (BC). The bus bar frame may support bus bars and terminals (TM).

[0053] Bus bars can be fixed on a bus bar frame. Bus bars may include metal. The electrode leads of the battery cells (BC) can each be drawn out through lead slits formed in the bus bar frame. The electrode leads can be joined to the bus bar by welding while in a bent state. However, this is not limited thereto, and the electrode leads of the battery cells (BC) may also be directly connected by welding or the like. In this case, the bus bar frame assembly (BFA1) may not include bus bars.

[0054] Bus bars can be connected to the positive leads of one or more battery cells (BC) of the first bank and to the negative leads of one or more battery cells (BC) of the last bank, respectively. The positive leads of each bank can be connected in series with the negative leads of an adjacent bank by a bus bar. The negative leads of each bank can be connected in series with the positive leads of an adjacent bank by a bus bar. Bus bars can be connected to the electrode leads by ultrasonic welding or laser welding, etc. The sum of the voltages of multiple battery cells (BC) can be output through the bus bars.

[0055] The terminals (TM) can be fixed on a bus bar frame. The terminals (TM) can be configured to transmit voltage and current generated inside the battery pack (100) to an external circuit. The terminals (TM) can be external connection points of the battery pack (100). Each terminal (TM) can be connected to the battery cells located at the outermost edge in the X direction among the battery cells (BC). The terminals (TM) can function as high-potential terminals. One of the terminals (TM) can function as a positive high-potential terminal, and the other of the terminals (TM) can function as a negative high-potential terminal.

[0056] The insulating cover may include an insulating material such as plastic. The insulating cover may be fitted into a bus bar frame. The insulating cover may be configured to cover an integrated circuit to protect electrical components.

[0057]

[0058] Referring again to FIG. 2, beams (110) can support a battery cell assembly (BCA). The beams (110) can be spaced apart in the X direction with the battery cell assembly (BCA) in between. The beams (110) can be configured to support the battery cell assembly (BCA) in the X direction. Each of the beams (110) can extend in the Y direction. A portion of the beams (110) can be adjacent to the outermost surface of the battery cell assembly (BCA) in the X direction. A portion of the beams (110) can be between adjacent battery cell assemblies (BCA). A portion of the beams (110) can separate the battery cell assemblies (BCA).

[0059]

[0060] A cover (CV) may be located on the upper side of a battery cell assembly (BCA) in the Z direction. The cover (CV) may include a plurality of venting holes (VH). The venting holes (VH) may be configured to facilitate the discharge of heat or gas, etc., when generated in one of the battery cells (BC in FIG. 3). In one embodiment, the venting holes (VH) may overlap with a corresponding one of the battery cells (BC) in the Z direction. In one embodiment, each battery cell (BC) may overlap with a plurality of venting holes (VH) in the Z direction.

[0061]

[0062] Hereinafter, the connection structure of the battery pack stack (10) will be described with reference to FIG. 4. FIG. 4 shows a cross-section along A-A' of FIG. 1.

[0063] Referring to FIGS. 1 through 4 together, the first battery pack (100) may include first internal connecting bolts (150). The first internal connecting bolts (150) may be configured to fasten the base plates (BP1, BP2), beams (110), and cover (CV) of the first battery pack (100). The first internal connecting bolts (150) may penetrate the base plates (BP1, BP2), beams (110), and cover (CV) of the first battery pack (100).

[0064] The second battery pack (200) may include second internal connecting bolts (250). The second internal connecting bolts (250) may be configured to fasten the base plates (BP1, BP2), beams (210), and cover (CV) of the second battery pack (200). The second internal connecting bolts (250) may penetrate the base plates (BP1, BP2), beams (210), and cover (CV) of the second battery pack (200).

[0065] The third battery pack (300) may include third internal connecting bolts (350). The third internal connecting bolts (350) may be configured to fasten the base plates (BP1, BP2), beams (310), and cover (CV) of the third battery pack (300). The third internal connecting bolts (350) may penetrate the base plates (BP1, BP2), beams (310), and cover (CV) of the third battery pack (300).

[0066] The fourth battery pack (400) may include fourth internal connecting bolts (450). The fourth internal connecting bolts (450) may be configured to fasten the base plates (BP1, BP2), beams (410), and cover (CV) of the fourth battery pack (400). The fourth internal connecting bolts (450) of the fourth battery pack (400) may penetrate the base plates (BP1, BP2), beams (410), and cover (CV).

[0067] In one embodiment, the first to fourth internal connecting bolts (150, 250, 350, 450) may be aligned in the Z direction, but are not limited thereto. In another embodiment, only some of the first to fourth internal connecting bolts (150, 250, 350, 450) may be aligned in the Z direction. In another embodiment, the first to fourth internal connecting bolts (150, 250, 350, 450) may not be aligned with each other in the Z direction.

[0068] Each of the beams (110) of the first battery pack (100) can be aligned in the Z direction with a corresponding beam (210) of the second battery pack (200). Each of the beams (210) of the second battery pack (200) can be aligned in the Z direction with a corresponding beam (310) of the third battery pack (300). Each of the beams (310) of the third battery pack (300) can be aligned in the Z direction with a corresponding beam (410) of the fourth battery pack (400).

[0069] The first pack connecting bolt (510) may be configured to connect the first and second battery packs (100, 200). The first pack connecting bolt (510) may be configured to penetrate the first and second battery packs (100, 200). The first pack connecting bolt (510) may be configured to penetrate the base plate (BP1, BP2), beam (110), and cover (CV) of the first battery pack (100), and the base plate (BP1, BP2), beam (210), and cover (CV) of the second battery pack (200).

[0070] The second pack connecting bolt (520) may be configured to connect the second and third battery packs (200, 300). The second pack connecting bolt (520) may be configured to penetrate the second and third battery packs (200, 300). The second pack connecting bolt (520) may be configured to penetrate the base plate (BP1, BP2), beam (210), and cover (CV) of the second battery pack (200), and the base plate (BP1, BP2), beam (310), and cover (CV) of the third battery pack (300).

[0071] The third pack connecting bolt (530) may be configured to connect the third and fourth battery packs (300, 400). The third pack connecting bolt (530) may be configured to penetrate the third and fourth battery packs (300, 400). The third pack connecting bolt (530) may be configured to penetrate the base plate (BP1, BP2), beam (310), and cover (CV) of the third battery pack (300), and the base plate (BP1, BP2), beam (410), and cover (CV) of the fourth battery pack (400).

[0072] The first pack connecting bolt (510) may not overlap with the second pack connecting bolt (520) in the Z direction. That is, the first pack connecting bolt (510) may be staggered with the second pack connecting bolt (520) in the Z direction. The first pack connecting bolt (510) may be spaced apart from the second pack connecting bolt (520) in the extension direction of the beams (110, 210, 310, 410). The first pack connecting bolt (510) may be spaced apart from the second pack connecting bolt (520) in the Y direction. The first pack connecting bolt (510) may be spaced apart from the third battery pack (300) in the Z direction. The first pack connecting bolt (510) may be spaced apart from the fourth battery pack (400) in the Z direction.

[0073] The first pack connecting bolt (510) may not overlap with the first to fourth internal connecting bolts (150, 250, 350, 450) in the Z direction. That is, the first pack connecting bolt (510) may be staggered with the first to fourth internal connecting bolts (150, 250, 350, 450) in the Z direction. The first pack connecting bolt (510) may be spaced apart from the first to fourth internal connecting bolts (150, 250, 350, 450) in the extension direction of the beams (110, 210, 310, 410). The first pack connecting bolt (510) may be spaced apart from the first to fourth internal connecting bolts (150, 250, 350, 450) in the Y direction.

[0074] The second pack connecting bolt (520) may not overlap with the third pack connecting bolt (530) in the Z direction. That is, the second pack connecting bolt (520) may be staggered with the third pack connecting bolt (530) in the Z direction. The second pack connecting bolt (520) may be spaced apart from the third pack connecting bolt (530) in the extension direction of the beams (110, 210, 310, 410). The second pack connecting bolt (520) may be spaced apart from the third pack connecting bolt (530) in the Y direction. The second pack connecting bolt (520) may be spaced apart from the first battery pack (100) in the Z direction. The second pack connecting bolt (520) may be spaced apart from the fourth battery pack (400) in the Z direction.

[0075] The second pack connecting bolt (520) may not overlap with the first to fourth internal connecting bolts (150, 250, 350, 450) in the Z direction. That is, the second pack connecting bolt (520) may be staggered with the first to fourth internal connecting bolts (150, 250, 350, 450) in the Z direction. The second pack connecting bolt (520) may be spaced apart from the first to fourth internal connecting bolts (150, 250, 350, 450) in the extension direction of the beams (110, 210, 310, 410). The second pack connecting bolt (520) may be spaced apart from the first to fourth internal connecting bolts (150, 250, 350, 450) in the Y direction.

[0076] The third pack connecting bolt (530) may be aligned with the first pack connecting bolt (510) in the Z direction. However, it is not limited thereto, and the third pack connecting bolt (530) may be staggered with the first pack connecting bolt (510) in the Z direction. The third pack connecting bolt (530) may be spaced apart from the first battery pack (100) in the Z direction. The third pack connecting bolt (530) may be spaced apart from the second battery pack (200) in the Z direction.

[0077] The third pack connecting bolt (530) may not overlap with the first to fourth internal connecting bolts (150, 250, 350, 450) in the Z direction. That is, the third pack connecting bolt (530) may be staggered with the first to fourth internal connecting bolts (150, 250, 350, 450) in the Z direction. The third pack connecting bolt (530) may be spaced apart from the first to fourth internal connecting bolts (150, 250, 350, 450) in the extension direction of the beams (110, 210, 310, 410). The third pack connecting bolt (530) may be spaced apart from the first to fourth internal connecting bolts (150, 250, 350, 450) in the Y direction.

[0078] The length in the Z direction of each of the first to third pack connecting bolts (510, 520, 530) may be smaller than the height in the Z direction of the battery pack stack (10). The length in the Z direction of each of the first to fourth internal connecting bolts (150, 250, 350, 450) may be smaller than the height in the Z direction of the battery pack stack (10).

[0079] A battery pack stack (10) according to exemplary embodiments of the present invention includes a plurality of battery packs (100, 200, 300, 400) stacked in the Z direction, so that the space utilization rate of the vehicle can be improved when placed inside a vehicle. Each of the first to third pack connecting bolts (510, 520, 530) can be configured to connect two adjacent battery packs (100, 200, 300, 400). Accordingly, even if the number of stacked battery packs (100, 200, 300, 400) increases, the length of the first to third pack connecting bolts (510, 520, 530) can be maintained at a size below a certain limit. Accordingly, the risk of damage to the first to third pack connecting bolts (510, 520, 530) caused by external impact applied to the battery pack stack (10) can be prevented or mitigated. That is, the structural rigidity of the battery pack stack (10) can be improved.

[0080] In FIGS. 1 to 4, an embodiment is illustrated in which the battery pack stack (10) includes four battery packs (100, 200, 300, 400), but is not limited thereto. The battery pack stack (10) may include two, three, or five or more battery packs stacked vertically.

[0081] In some embodiments, the battery pack stack (10) may have a structure in which a stacked structure of a certain number of battery packs is repeated multiple times. For example, the battery pack stack (10) may have a structure in which a stacked structure of first to third battery packs (100, 200, 300) is repeated multiple times. In this case, the method of connecting the third battery pack (300) to the fourth battery pack (400) may be applied in the same way as the method of connecting the first battery pack (100) to the second battery pack (200). Accordingly, the first and third pack connecting bolts (510, 530) may be aligned in the Z direction. This allows the assembly process of the battery pack stack (10) to be performed repeatedly, and process efficiency may be improved.

[0082]

[0083] (2nd Example)

[0084] FIG. 5 is a flowchart for explaining a method of manufacturing a battery pack stack (10) according to exemplary embodiments.

[0085]

[0086] Referring to FIGS. 1 to 5 together, in S10, the first and second battery packs (100, 200) can be stacked in the Z direction.

[0087] The second battery pack (200) may be located above the first battery pack (100) in the Z direction. The beams (210) of the second battery pack (200) may be aligned in the Z direction with the corresponding beams (110) of the first battery pack (100).

[0088]

[0089] In S20, a first pack connecting bolt (510) that penetrates the first and second battery packs (100, 200) can be fastened.

[0090] The first pack connecting bolt (510) can penetrate the base plate (BP1, BP2), beam (110), and cover (CV) of the first battery pack (100), and the base plate (BP1, BP2), beam (210), and cover (CV) of the second battery pack (200).

[0091]

[0092] In S30, a third battery pack (300) can be stacked on the second battery pack (200).

[0093] The third battery pack (300) may be located above the second battery pack (200) in the Z direction. The beams (310) of the third battery pack (300) may be aligned in the Z direction with the corresponding beams (210) of the second battery pack (200).

[0094]

[0095] In S40, a second pack connecting bolt (520) that penetrates the second and third battery packs (200, 300) can be fastened.

[0096] The second pack connecting bolt (520) can penetrate the base plate (BP1, BP2), beam (210), and cover (CV) of the second battery pack (200), and the base plate (BP1, BP2), beam (310), and cover (CV) of the third battery pack (300). The second pack connecting bolt (520) can be staggered from the first pack connecting bolt (510) in the Z direction.

[0097]

[0098] In S50, a fourth battery pack (400) can be stacked on a third battery pack (300).

[0099] The fourth battery pack (400) may be located above the third battery pack (300) in the Z direction. The beams (410) of the fourth battery pack (400) may be aligned in the Z direction with the corresponding beams (410) of the third battery pack (300).

[0100]

[0101] In S50, a third pack connecting bolt (530) that penetrates the third and fourth battery packs (300, 400) can be fastened.

[0102] The third pack connecting bolt (530) can penetrate the base plate (BP1, BP2), beam (310), and cover (CV) of the third battery pack (300), and the base plate (BP1, BP2), beam (410), and cover (CV) of the fourth battery pack (400). The third pack connecting bolt (530) can be staggered with the second pack connecting bolt (520) in the Z direction. The third pack connecting bolt (530) can be aligned with the first pack connecting bolt (510) in the Z direction.

[0103]

[0104] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

Claims

1. First to third battery packs sequentially stacked in the vertical direction; A first pack connecting bolt for connecting the first and second battery packs; and It includes a second pack connecting bolt for connecting the second and third battery packs, and A battery pack stack in which the first pack connecting bolt and the second pack connecting bolt are staggered in the vertical direction.

2. In Paragraph 1, Each of the above first to third battery packs is, Base plate; A plurality of battery cell assemblies on the base plate above; and It includes a beam that is on the base plate and separates the plurality of battery cell assemblies, and A battery pack stack characterized in that the beams of the first to third battery packs are aligned in a vertical direction.

3. In Paragraph 2, The first pack connecting bolt is configured to penetrate the beam of the first battery pack and the beam of the second battery pack, and A battery pack stack characterized in that the second pack connecting bolt is configured to penetrate the beam of the second battery pack and the beam of the third battery pack.

4. In Paragraph 3, A battery pack stack characterized in that the first pack connecting bolt is spaced apart from the second pack connecting bolt in the beam extension direction of each of the first to third battery packs.

5. In Paragraph 2, The first battery pack further includes a first internal connecting bolt for connecting a beam and a base plate, and The second battery pack further includes a second internal connecting bolt for connecting a beam and a base plate, and A battery pack stack characterized in that the third battery pack further includes a third internal connecting bolt that fastens the beam and the base plate.

6. In Paragraph 5, A battery pack stack characterized in that the first to third internal connecting bolts are aligned in a vertical direction.

7. In Paragraph 5, Each of the above first to third internal connecting bolts is staggered in a direction perpendicular to the first pack connecting bolt, and A battery pack stack characterized in that each of the first to third internal connecting bolts is staggered in a vertical direction with respect to the second pack connecting bolt.

8. In Paragraph 5, Each of the first to third internal connecting bolts is spaced apart from the first pack connecting bolt in the beam extension direction of each of the first to third battery packs, and A battery pack stack characterized in that each of the first to third internal connecting bolts is spaced apart from the second pack connecting bolt in the beam extension direction of each of the first to third battery packs.

9. In Paragraph 5, Each of the first to third battery packs further comprises a cover having venting holes, which is positioned on top of the plurality of battery cell assemblies, and A battery pack stack characterized in that each of the first to third internal connecting bolts fastens a base plate, a beam, and a cover.

10. In Paragraph 1, The first pack connection bolt is spaced apart from the third battery pack in a vertical direction, and A battery pack stack characterized in that the second pack connecting bolt is spaced apart from the first battery pack in a vertical direction.

11. In Paragraph 1, A fourth battery pack on the third battery pack above; and It further includes a third pack connecting bolt for connecting the third and fourth battery packs, and A battery pack stack characterized in that the third pack connecting bolt is aligned in a vertical direction with the first pack connecting bolt.

12. In Paragraph 11, A battery pack stack characterized in that the third pack connecting bolt is spaced vertically apart from each of the first and second battery packs.

13. In Paragraph 1, A battery pack stack characterized in that the vertical length of each of the first and second pack connection bolts is smaller than the vertical height of the battery pack stack.

14. A step of stacking the first and second battery packs in a vertical direction; A step of fastening a first pack connecting bolt penetrating the first and second battery packs; A step of stacking a third battery pack on the second battery pack; and The method includes the step of fastening a second pack connecting bolt penetrating the second and third battery packs, and A method for manufacturing a battery pack stack in which the first and second pack connecting bolts are staggered in the vertical direction.

15. In Paragraph 14, A step of stacking a fourth battery pack on the third battery pack; and The method further includes the step of fastening a third pack connecting bolt penetrating the third and fourth battery packs, and A method for manufacturing a battery pack stack, characterized in that the third pack connecting bolt is aligned in a vertical direction with the first pack connecting bolt, but is staggered in a vertical direction with the second pack connecting bolt.

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