Battery pack

Abstract

The present invention discloses a battery pack comprising: a battery sub-pack including a battery stack having a structure in which a plurality of batteries including electrodes and separators are stacked in one direction, and an end plate portion provided so as to be in close contact with the battery stack; an extension member provided in close contact with the end plate portion; and a tray portion accommodating the battery sub-pack and the extension member, in which the end plate portion, the extension member, and the tray portion are fixedly coupled to each other.

Description

Technical Field

[0001] The present invention relates to a battery pack, and more particularly, to a battery pack having a structure with a higher energy density compared to the prior art. Background Art

[0002] A battery pack assembled in a device such as a vehicle is generally manufactured by fabricating battery cells having an electrode and separator stack structure, stacking a plurality of battery cells to form a battery module, and then stacking a plurality of battery modules again.

[0003] On the other hand, in the case of an electric vehicle, in order to have a longer driving distance, it is necessary to maximize the capacity of the battery pack installed in the electric vehicle. However, since the space inside the electric vehicle where the battery pack can be installed is limited, in order to ensure the long endurance performance of the electric vehicle, it is necessary to mount a battery pack with a higher energy density per unit volume.

[0004] However, according to the prior art, in addition to the battery, a plurality of components unrelated to the component for storing electric energy (i.e., the battery), such as components for heat dissipation and cooling, components for electrical insulation from the outside, and components for protecting the battery from external impacts, are also arranged in the battery pack. These components have an obstructive effect on the energy density of the battery pack. In particular, since the manufacturing processes of the battery, the battery module, and the battery pack are carried out step by step, components with similar functions are repeatedly installed in the battery module and the battery pack, thereby exacerbating this problem. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to maximize the energy density of the battery pack by minimizing the components that perform functions unrelated to electric energy storage in the battery pack.

[0006] According to one aspect of the present invention for achieving the above object, there is provided a battery pack, including: a battery sub-pack including: a battery stack having a structure in which a plurality of batteries including electrodes and separators are stacked in one direction; and an end plate portion disposed in close contact with the battery stack; an extension member disposed in close contact with the end plate portion; and a tray portion for accommodating the battery sub-pack and the extension member, wherein the end plate portion, the extension member, and the tray portion are fixedly coupled to each other.

[0007] Through holes are respectively formed in the end plate portion and the extension member, and the battery pack further includes a coupling member that passes through the through holes respectively formed in the end plate portion and the extension member, wherein the end plate portion, the extension member, and the tray portion can be fixedly coupled to each other through the coupling member.

[0008] The above-mentioned tray part includes: a tray main body area which forms an internal space (S) for accommodating the above-mentioned battery sub-pack and the above-mentioned extension member; and an inner protruding area which protrudes from the inner side surface defining the internal space (S) into the internal space (S) in the above-mentioned tray main body area. The above-mentioned coupling member includes: a side coupling member which is fastened to the above-mentioned end plate part, the above-mentioned extension member, and the above-mentioned inner protruding area.

[0009] The above-mentioned battery sub-pack includes a first battery sub-pack and a second battery sub-pack spaced apart from the first battery sub-pack in one direction. The above-mentioned extension member is disposed between the end plate part disposed on the first battery sub-pack and the end plate part disposed on the second battery sub-pack. The end plate part disposed on the first battery sub-pack, the end plate part disposed on the second battery sub-pack, the above-mentioned extension member, and the above-mentioned tray part can be fixedly coupled to each other by being fastened to the above-mentioned side coupling member.

[0010] The above-mentioned end plate part includes: a first end plate part which is disposed in close contact with one side of the above-mentioned battery stack; and a second end plate part which is disposed in close contact with the other side of the above-mentioned battery stack and is disposed opposite to the first end plate part, thereby sandwiching the above-mentioned battery stack therebetween. The above-mentioned extension member is respectively disposed in close contact with the first end plate part disposed on the first battery sub-pack and the second end plate part disposed on the second battery sub-pack. The first end plate part disposed on the first battery sub-pack, the second end plate part disposed on the second battery sub-pack, the above-mentioned extension member, and the above-mentioned tray part can be fixedly coupled to each other by being fastened to the above-mentioned side coupling member.

[0011] The above-mentioned first end plate part includes a first fastening area which forms a through hole for the above-mentioned side coupling member to pass through, and the first fastening area extends towards the above-mentioned inner protruding area. The above-mentioned second end plate part includes a second fastening area which forms a through hole for the above-mentioned side coupling member to pass through, and the second fastening area extends towards the above-mentioned inner protruding area. The lower surface of the above-mentioned first fastening area is disposed to be opposite to the upper surface of the above-mentioned inner protruding area, and the lower surface of the above-mentioned second fastening area can be disposed to be opposite to the upper surface of the above-mentioned first fastening area.

[0012] The above-mentioned extension member includes: an extension member main body area which is disposed in close contact with the above-mentioned end plate part; and a third fastening area which extends from the above-mentioned extension member main body area and forms a through hole for the above-mentioned side coupling member to pass through. Among them, the lower surface of the above-mentioned third fastening area can be disposed to be opposite to the upper surface of the above-mentioned second fastening area.

[0013] The above end plate portion includes: an end plate main body region that is disposed in close contact with the above battery stack; and a bending region that extends from the above end plate main body region and bends toward the above battery stack, wherein at least a part of the bending region and the above battery stack may overlap each other along the direction in which the bending region extends from the above end plate main body region.

[0014] The above end plate portion includes: an end plate main body region that is disposed in close contact with the above battery; and a blocking region that bends from the above end plate main body region toward an extending member, wherein at least a part of the blocking region and the above extending member may overlap each other along the direction in which the blocking region extends from the above end plate main body region.

[0015] The above end plate portion may include: an insulating plate that is disposed in close contact with the above battery stack and includes a material having electrical insulation properties; and a surface pressing plate that is disposed in close contact with the above insulating plate and sandwiches the above insulating plate therebetween and is disposed opposite to the above battery stack.

[0016] The above insulating plate includes: an insulating plate main body region that is disposed in close contact with the above battery stack; and an insulating plate protruding region that protrudes from the above insulating plate main body region in a direction away from the above battery stack, wherein a through hole having a shape corresponding to the above insulating plate protruding region is formed in the above surface pressing plate, and the above insulating plate protruding region may be combined with the above surface pressing plate through the through hole of the above surface pressing plate.

[0017] A plurality of the above insulating plate protruding regions may be formed.

[0018] The above extending member includes an extending member main body region that is disposed in close contact with the above surface pressing plate. The above extending member main body region includes: a first thickness interval having a first thickness (t1) in a direction toward the above surface pressing plate; and a second thickness interval having a second thickness (t2) in a direction toward the above surface pressing plate, and the above second thickness may be smaller than the above first thickness.

[0019] The above second thickness interval is formed at an upper end portion or a lower end portion of a region of the above extending member main body region that is opposite to the above insulating plate protruding region, and the width of the above second thickness interval formed at the upper end portion or the lower end portion of the above extending member main body region may be larger than the width of the above insulating plate protruding region.

[0020] The above second thickness interval is formed at an upper end portion or a lower end portion of a region of the above extending member main body region that is opposite to the above insulating plate protruding region, and the width of the above second thickness interval formed at the upper end portion or the lower end portion of the above extending member main body region may correspond to the width of the above insulating plate protruding region.

[0021] The above-mentioned second thickness interval can be formed at the upper end and the lower end of the region in the above-mentioned extension member main body region that is opposite to the above-mentioned insulating plate protruding region respectively.

[0022] The above-mentioned insulating plate protruding region can be arranged in close contact with the above-mentioned extension member main body region.

[0023] Within one of the above-mentioned battery sub-packages, the above-mentioned battery stack includes: a first battery stack; and a second battery stack, which is separately arranged from the above-mentioned first battery stack. Among them, within one battery sub-package, within the end plate portions respectively arranged on both sides of the above-mentioned battery stack, one surface pressing plate can be arranged, and a plurality of the above-mentioned insulating plates can be arranged.

[0024] The above-mentioned extension member includes an extension member main body region arranged in close contact with the above-mentioned end plate portion. In the above-mentioned extension member main body region, a recessed interval is formed in the interval corresponding to the interval between the first battery stack and the second battery stack within one battery sub-package. This recessed interval has a lower height in the up and down direction compared with other regions, so that it can have a shape recessed downward.

[0025] The above-mentioned tray portion can include a tray main body region, and an internal space (S) for accommodating the above-mentioned battery sub-package and the above-mentioned extension member is formed in the tray main body region. The above-mentioned coupling member can include a floor coupling member for fastening the above-mentioned end plate portion, the above-mentioned extension member, and the above-mentioned tray main body region.

[0026] A plurality of battery stacks are arranged within the above-mentioned battery sub-package. The direction in which the plurality of battery stacks are spaced apart from each other within the above-mentioned battery sub-package intersects with the direction in which the plurality of batteries are stacked within the above-mentioned battery stack. Within the above-mentioned battery sub-package, the length of the above-mentioned surface pressing plate can correspond to the sum of the lengths of the plurality of battery stacks within the above-mentioned battery sub-package and the total distance between two adjacent battery stacks.

[0027] The above-mentioned floor coupling member can be arranged to insert into the upper surface of the above-mentioned tray main body region and be spaced upward from the lower surface of the above-mentioned tray main body region.

[0028] The above-mentioned floor coupling member can be fastened to the above-mentioned blocking region arranged on the above-mentioned end plate portion, the extension member main body region forming the main body of the above-mentioned extension member, and the above-mentioned tray main body region.

[0029] The region where the above-mentioned floor coupling member is fastened in the above-mentioned extension member main body region can have a shape recessed downward.

[0030] According to the present invention, by minimizing the components in the battery pack that perform functions unrelated to electric energy storage, the energy density of the battery pack can be maximized. Description of the Drawings

[0031] Figure 1 is a perspective view of a battery pack according to the present invention.

[0032] Figure 2 is a perspective view after removing the battery pack cover from the battery pack according to the present invention.

[0033] Figure 3 is Figure 2 an exploded perspective view of the components shown in

[0034] Figure 4 an exploded perspective view of a battery stack, a sensing block, a sensing block insulating member, and a sensing member disposed in a battery sub-pack of the battery pack according to the present invention.

[0035] Figure 5 is an exploded perspective view of a battery sub-pack disposed in the battery pack according to the present invention.

[0036] Figure 6 is an exploded perspective view of an end plate disposed in a battery sub-pack of the battery pack of the present invention.

[0037] Figure 7 is a schematic view showing an enlarged view of end plates of adjacent battery sub-packs overlapping each other in the battery pack according to the present invention.

[0038] Figure 8 is a schematic view showing an enlarged view of an end plate and an extension member being fastened in the battery pack according to the present invention.

[0039] Figure 9 is a perspective view showing an enlarged view of a partial area of a tray portion of the battery pack according to the present invention.

[0040] Figure 10 is a first vertical sectional view of a partial area in the battery pack according to the present invention.

[0041] Figure 11 is a second vertical sectional view of a partial area in the battery pack according to the present invention.

[0042] Figure 12 is an exploded perspective view of an extension member disposed in the battery pack according to the present invention.

[0043] Description of Reference Numerals

[0044] 10: Battery pack

[0045] 100: Battery sub-pack

[0046] 100a: First battery sub-pack

[0047] 100b: Second battery sub-pack

[0048] 110: Battery stack

[0049] 111: First battery stack

[0050] 112: Second battery stack

[0051] 120: Sensing block

[0052] 122: Blocking protrusion

[0053] 130: Sensing block insulating member

[0054] 140: Connecting member

[0055] 150: End plate portion

[0056] 150a: Insulating plate

[0057] 150a-1: Insulating plate main region

[0058] 150a-2: Insulating plate protruding region

[0059] 150b: Surface pressing plate

[0060] 150b-1: Recessed section

[0061] 151: First end plate portion

[0062] 151a: First fastening region

[0063] 152: Second end plate portion

[0064] 152a: Second fastening region

[0065] 153: End plate main region

[0066] 154: Bending region

[0067] 156: Blocking region

[0068] 200: Extension member

[0069] 210: Extension member main region

[0070] 210a: Groove region

[0071] 210b: Recessed section

[0072] 211: First thickness section

[0073] 212: Second thickness section

[0074] 220: Third fastening region

[0075] 300: Tray portion

[0076] 310: Tray main body area

[0077] 320: Inner protruding area

[0078] 400: Side coupling member

[0079] 500: Floor coupling member

[0080] 600: Package cover

[0081] 700: Component module

[0082] S: Inner space of the tray main body area

[0083] t1: First thickness

[0084] t2: Second thickness. Detailed implementation mode

[0085] Hereinafter, the battery pack of the present invention will be described with reference to the accompanying drawings.

[0086] Battery pack

[0087] Figure 1 is a perspective view of the battery pack according to the present invention, Figure 2 is a perspective view after removing the battery pack cover from the battery pack according to the present invention. Figure 3 is Figure 2 an exploded perspective view of the components shown in.

[0088] Referring to Figures 1 to 3 , the battery pack of the present invention can include a battery sub-pack 100. The battery sub-pack 100 can have a structure in which a plurality of batteries are stacked. More specifically, the battery sub-pack 100 can include a battery stack 110 having a structure in which a plurality of batteries including electrodes and separator films are stacked in one direction. However, this does not mean that the battery stack 110 is limited to including batteries. As an example, the battery stack 110 can include not only batteries but also spacers disposed between adjacent batteries, and can apply pressure to the batteries with a specific surface pressure.

[0089] On the other hand, the battery sub-pack 100 included in the battery pack of the present invention can have a structure different from that of the battery module in the prior art. That is, the battery module in the prior art itself has a structure capable of forming a specific surface pressure on the batteries in the battery module. More specifically, in the battery module in the prior art, side plates are usually arranged on both sides of the structure in which the batteries are stacked, and by installing and connecting clamping members for the two side plates, the side plates apply pressure to the structure in which the batteries are stacked, so that a specific surface pressure can be formed on the batteries in the battery module by itself, and at the same time, the components between the battery modules can be kept fixed without being loose from each other.

[0090] On the other hand, the battery sub-pack 100 of the present invention is different from the battery module in the prior art in that it is not configured with a structure for forming a surface pressure on the battery, and the internal structure of the battery sub-pack 100 cannot maintain a fixed state with each other without an external device (e.g., a jig). However, as described later, the battery sub-pack 100 of the present invention can not only form a specific surface pressure on the internal battery through combination with other components configured in the battery pack of the present invention, but also stably achieve relative fixation between the components within the battery sub-pack 100.

[0091] Figure 4 is an exploded perspective view of a battery stack, a sensing block, a sensing block insulating member, and a sensing member disposed within a battery sub-pack of a battery pack according to the present invention, Figure 5 is an exploded perspective view of a battery sub-pack of a battery pack according to the present invention, Figure 6 is an exploded perspective view of an end plate disposed within a battery sub-pack of a battery pack of the present invention.

[0092] Referring to Figure 4 and Figure 5 , the battery sub-pack 100 can further include: a sensing block 120 disposed on one side of the battery stack 110 and electrically connected to the battery stack 110; and a sensing block insulating member 130 configured to sandwich the sensing block 120 therebetween and oppose the battery stack 110. More specifically, the sensing block 120 can be electrically connected to the battery stack 110 through electrode leads protruding from the battery stack 110. As an example, in Figure 4 and Figure 5 , the sensing blocks 120 are respectively disposed on both sides where the electrode leads of the battery stack 110 protrude, and the sensing block insulating members 130 are disposed outside each sensing block 120.

[0093] On the other hand, one sensing block 120 can be disposed on each of both sides of the battery stack 110. At this time, the battery sub-pack 100 can further include a connection member 140 that electrically connects the sensing blocks 120 disposed on both sides of the battery stack 110 to each other. Thus, it is possible to measure the voltage between the sensing blocks 120 disposed on both sides of the battery stack 110.

[0094] On the other hand, as Figure 5 shows, the battery sub-pack 100 can further include an end plate portion 150 configured to be in close contact with one side of the battery stack 110. The end plate portion 150 can be configured to be in close contact with other sides of the side surface of the battery sub-pack 100 where the sensing block 120 is not located. On the other hand, in this specification, the directions of the positions of the sensing block 120 and the end plate portion 150 with respect to the battery stack 110 are defined as the horizontal directions.

[0095] The end plate portion 150 can apply pressure to the battery sub-pack 100, thereby applying a specific pressure to the battery stack 110 disposed in the battery sub-pack 100, so that the charging and discharging of the battery sub-pack 100 can proceed normally, and the swelling phenomenon that may occur in the battery stack 110 can be suppressed.

[0096] Refer again to Figures 1 to 3 , the battery pack 10 of the present invention can further include: an extension member 200 configured to be in close contact with the end plate portion 150; a tray portion 300 for accommodating the battery sub-pack 100 and the extension member 200; and a cover 600 that Figure 1 covers the upper portion of the tray portion 300 based on

[0097] The extension member 200 can be a component for ensuring the overall physical rigidity of the battery pack 10. That is, when an external force is applied to the battery pack 10, the extension member 200 can resist this external force, thereby preventing the deformation and damage of the battery pack 10. Moreover, the extension member 200 can apply pressure to the battery sub-pack 100 through the end plate portion 150. At this time, the swelling phenomenon of the battery sub-pack 100 can be more effectively suppressed.

[0098] Refer to Figures 1 to 3 , the extension member 200 can have a shape that extends with the horizontal direction intersecting the stacking direction of the batteries in the battery stack 110 as the length direction. In order to ensure sufficient mechanical rigidity, the extension member 200 can include a metal or alloy material. As an example, the extension member 200 can contain an aluminum material. However, the material of the extension member 200 is not limited to the above content. The detailed shape of the extension member 200 will be described later.

[0099] On the other hand, the present invention aims to maximize the energy density of the battery pack 10 by increasing the volume occupied by the battery in the battery pack 10. To achieve the above object, compared with the prior art, it is necessary to minimize the volume occupied by other components other than the battery in the battery pack 10.

[0100] On the other hand, a general battery pack is manufactured through the following steps: i) manufacturing a battery having a structure in which electrodes and a separator are stacked; ii) stacking a plurality of batteries to manufacture a battery module; iii) stacking a plurality of battery modules again. At this time, according to the prior art, the functions of the components constituting the battery module overlap with those of a part of the components other than the battery module in the battery pack, which becomes a factor reducing the energy density of the battery pack.

[0101] The present invention may be an invention for solving the above problems. That is, according to the present invention, by removing components that perform similar functions within the battery pack, more batteries can be installed within the battery pack, thereby maximizing the energy density of the battery pack.

[0102] Figure 7 is a schematic diagram showing an enlarged view of end plates of adjacent battery sub - packs overlapping each other in the battery pack according to the present invention, Figure 8 is a schematic diagram showing an enlarged view of the end plate and the extension member being fastened in the battery pack according to the present invention.

[0103] Referring to Figure 7 and Figure 8 , in order to achieve the above object, according to the present invention, the end plate portion 150, the extension member 200, and the tray portion 300 can be fixedly coupled to each other.

[0104] According to the present invention, the end plate portion 150 and the extension member 200 can be understood as integrating the components of the battery sub - pack and the components of the battery pack other than the battery sub - pack in a battery pack based on the prior art. That is, according to the present invention, by integrating the components arranged in the battery sub - pack to ensure the mechanical rigidity of the battery sub - pack and the components arranged in the battery pack to ensure the mechanical rigidity of the battery pack into one component, namely the extension member 200, the components arranged in the battery pack 10 can be simplified. Therefore, according to the present invention, the energy density of the battery pack 10 can be increased. Hereinafter, the features for fixedly coupling the end plate portion 150, the extension member 200, and the tray portion 300 to each other will be described in detail.

[0105] Referring to Figure 7 and Figure 8 , through - holes can be formed in the end plate portion 150 and the extension member 200 respectively. More specifically, the through - holes formed in the end plate portion 150 and the through - holes formed in the extension member 200 are formed at corresponding positions so that they can communicate with each other.

[0106] On the other hand, the battery pack 10 of the present invention can further include a coupling member passing through the above - mentioned through - holes formed in the end plate portion 150 and the extension member 200 respectively. At this time, the end plate portion 150, the extension member 200, and the tray portion 300 are fastened by the coupling member, so that they can be fixedly coupled to each other. More specifically, the coupling member can pass through the above - mentioned through - holes formed in the end plate portion 150 and the extension member 200 respectively and be coupled to the tray portion 300. Thus, the end plate portion 150, the extension member 200, and the tray portion 300 can be fixedly coupled to each other. As an example, the coupling member can be a bolt. Additionally, as an example, the coupling member can pass through not only the end plate portion 150 and the extension member 200 but also the tray portion 300.

[0107] Figure 9is an enlarged perspective view showing a partial area of a tray portion of a battery pack according to the present invention.

[0108] Referring to Figure 8 and Figure 9 , the tray portion 300 can include: a tray main body area 310, which forms an internal space S for accommodating the battery sub-pack 100 and the extension member 200; and an inner protruding area 320, which protrudes from the inner side surface of the tray main body area 310 that defines the internal space S into the internal space S.

[0109] On the other hand, the above-mentioned coupling member can include a side coupling member 400 fastened to the side portions of the end plate portion 150, the extension member 200, and the inner protruding area 320. That is, according to the present invention, the side coupling member 400 passes through the end plate portion 150 and the extension member 200 and is fastened to the inner protruding area 320, so that the end plate portion 150, the extension member 200, and the tray portion 300 can be fixedly coupled to each other. On the other hand, as an example, a predetermined space can be formed between the upper surface and the lower surface of the inner protruding area 320. This can be understood as the upper surface and the lower surface of the inner protruding area 320 being spaced apart from each other. At this time, the side coupling member 400 can pass through the upper surface of the inner protruding area 320.

[0110] Figure 10 is a first vertical sectional view of a partial area in the battery pack according to the present invention, Figure 11 is a second vertical sectional view of a partial area in the battery pack according to the present invention.

[0111] Referring to Figure 7 , Figure 8 , Figure 10 and Figure 11 , the battery pack 10 according to the present invention can include a plurality of battery sub-packs 100. That is, the battery sub-packs 100 arranged in the battery pack 10 can include a first battery sub-pack 100a and a second battery sub-pack 100b spaced apart from the first battery sub-pack 100a in one direction. However, the fact that the battery sub-pack 100 includes the first battery sub-pack 100a and the second battery sub-pack 100b does not mean that the battery pack 10 only includes two battery sub-packs. On the contrary, according to a more preferred example, the battery pack 10 can include more than two battery sub-packs.

[0112] As described above, when the battery sub-pack 100 includes the first battery sub-pack 100a and the second battery sub-pack 100b, the extension member 200 can be disposed between the end plate portion 150 disposed in the first battery sub-pack 100a and the end plate portion 150 disposed in the second battery sub-pack 100b. At this time, according to the present invention, the end plate portion 150 disposed in the first battery sub-pack 100a, the end plate portion 150 disposed in the second battery sub-pack 100b, the extension member 200, and the tray portion 300 can be respectively fastened by the coupling member, so that they can be fixedly coupled to each other.

[0113] On the other hand, within one battery sub-pack 100, one end plate portion 150 can be provided on each of the two side surfaces of the battery stack 110. This can be understood as that within one battery sub-pack 100, the two end plate portions 150 sandwich the battery stack 110 therebetween and apply pressure to the battery stack 110 in a state of facing each other.

[0114] Therefore, within one battery sub-pack 100, the end plate portion 150 can be divided into a first end plate portion and a second end plate portion. That is, referring to Figure 7 , Figure 8 , Figure 10 and Figure 11 , the end plate portion 150 can include: a first end plate portion 151 which is disposed in close contact with one side of the battery stack 110; and a second end plate portion 152 which is disposed in close contact with the other side of the battery stack 110 and is opposite to the first end plate portion 151, thereby sandwiching the battery stack 110 therebetween. On the other hand, the content regarding the first end plate portion 151 and the second end plate portion 152 described above and those to be mentioned later can be applied not only to the battery sub-pack 100, but also to the first battery sub-pack 100a and the second battery sub-pack 100b respectively.

[0115] At this time, as shown in Figure 7 , Figure 8 , Figure 10 and Figure 11 , according to the present invention, the extension member 200 can be respectively disposed in close contact with the first end plate portion 151 disposed in the first battery sub-pack 100a and the second end plate portion 152 disposed in the second battery sub-pack 100b. In addition, the first end plate portion 151 disposed in the first battery sub-pack 100a, the second end plate portion 152 disposed in the second battery sub-pack 100b, the extension member 200, and the tray portion 300 are fastened by the coupling member, so that they can be fixedly coupled to each other. Hereinafter, the relative positional relationship between the first end plate portion 151 and the second end plate portion 152 between adjacent battery sub-packs will be described in detail.

[0116] On the other hand, referring to Figure 7 , Figure 8 , Figure 10 andFigure 11 , the first end plate portion 151 can include a first fastening area 151a extending toward the inner protruding area 320 of the tray portion 300, and a through hole for the side coupling member 400 to pass through is formed in the first fastening area 151a. The second end plate portion 152 can include a second fastening area 152a extending toward the inner protruding area 320 of the tray portion 300, and a through hole for the side coupling member 400 to pass through is formed in the second fastening area 152a. At this time, the lower surface of the first fastening area 151a can be arranged to face the upper surface of the inner protruding area 320, and the lower surface of the second fastening area 152a can be arranged to face the upper surface of the first fastening area 151a. This can be understood as being based on Figure 7 , Figure 8 , Figure 10 and Figure 11 , the side coupling member 400 passes through the second fastening area 152a, the first fastening area 151a, and the inner protruding area 320 in sequence from above. More preferably, the lower surface of the second fastening area 152a can be in close contact with the upper surface of the first fastening area 151a, and the lower surface of the first fastening area 151a can be in close contact with the upper surface of the inner protruding area 320.

[0117] Figure 12 is an exploded perspective view of an extension member configured in a battery pack according to the present invention.

[0118] On the other hand, similar to the first end plate portion 151 and the second end plate portion 152, the extension member 200 can also include a fastening area for fastening the side coupling member 400. More specifically, as Figure 12 shown, the extension member 200 can include: an extension member main body area 210, which forms the main body of the extension member 200 and is arranged in close contact with the end plate portion 150; and a third fastening area 220, which extends from the extension member main body area 210 and is formed with a through hole for the side coupling member 400 to pass through. More specifically, the extension member main body area 210 can be respectively arranged in close contact with the first end plate portion 151 configured in the first battery sub-pack 100a and the second end plate portion 152 configured in the second battery sub-pack 100b.

[0119] At this time, as Figure 11 and Figure 12 shown, the lower surface of the third fastening area 220 can be arranged to face the upper surface of the second fastening area 152a. This can be understood as taking Figure 7 , Figure 8 , Figure 10 and Figure 11With [reference] as the benchmark, the side coupling member 400 sequentially passes through the third fastening area 220, the second fastening area 152a, the first fastening area 151a, and the inner protruding area 320 from above. More preferably, the lower surface of the third fastening area 220 can be in close contact with the upper surface of the second fastening area 152a.

[0120] On the other hand, the end plate portion 150 can be divided into multiple areas. The content regarding the end plate portion 150 described above and hereinafter also applies equally to the first end plate portion 151 and the second end plate portion 152.

[0121] Referring to Figure 6 and Figure 10 , the end plate portion 150 can include: an end plate main body area 153 which is disposed in close contact with the battery stack 110; and a bending area 154 which extends from the end plate main body area 153 and bends towards the battery stack 110. That is, the bending area 154 can be configured to bend towards the battery stack 110 which belongs to the same battery sub-pack 100 as the end plate 150. More preferably, when the arrangement direction of the multiple battery sub-packs 100 in the battery pack 10 is defined as the horizontal direction, the bending area 154 can extend from the upper end portion of the end plate main body area 153.

[0122] At this time, according to the present invention, as Figure 10 shown, along the direction in which the bending area 154 extends from the end plate main body area 153, the bending area 154 and the battery stack 110 can at least partially overlap each other. This can be to prevent the battery stack 110 from detaching from the end plate portion 150 within the battery sub-pack 100, and through the blocking effect between the end plate portion 150 and the battery stack 110, to make the end plate portion 150 in place during the manufacturing process of the battery pack 10. That is, according to the above content, with Figure 10 as the benchmark, it is possible to prevent the battery stack 110 from detaching upward, and it is possible to prevent the end plate portion 150 from moving excessively downward during the manufacturing process of the battery pack 10.

[0123] On the other hand, continuing to refer to Figure 6 and Figure 10 , in addition to the end plate main body area 153 and the bending area 154, the end plate portion 150 can further include a blocking area 156 which bends from the end plate main body area 153 towards the extension member 200. That is, it can be understood that the blocking area 156 extends in a direction opposite to the direction in which the bending area 154 extends from the end plate main body area 153. That is, the blocking area 156 can be configured to bend in a direction away from the battery stack 110 which belongs to the same battery sub-pack 100 as the end plate 150. More preferably, when the arrangement direction of the battery sub-packs 100 in the battery pack 10 is defined as the horizontal direction, the blocking area 156 can extend from the lower end portion of the end plate main body area 153.

[0124] At this time, according to the present invention, as Figure 10 shown, along the direction in which the blocking region 156 extends from the end plate main body region 153, at least a part of the blocking region 156 and the extension member 200 can overlap each other. This can be for the purpose of positioning the extension member 200 in place during the manufacturing process of the battery pack 10 through the blocking effect between the blocking region 156 and the extension member 200. That is, based on the above content, Figure 10 as a reference, it is possible to prevent the extension member 200 from moving excessively downward during the manufacturing process of the battery pack 10. On the other hand, as an example, in Figure 10 it is shown as follows: In the first end plate portion 151 and the second end plate portion 152 (that is, the first end plate portion and the second end plate portion respectively provided in different battery sub - packs) that sandwich the extension member 200 and are disposed opposite to each other, the blocking region 156 of the second end plate portion 152 is disposed between the blocking region 156 of the first end plate portion 151 and the extension member 200.

[0125] On the other hand, according to the present invention, the end plate portion 150 can be a structure in which components made of different materials are combined.

[0126] That is, referring to Figure 6 , the end plate portion 150 can include: an insulating plate 150a, which is disposed in close contact with the battery stack 110 and includes a material having electrical insulation properties; and a face pressing plate 150b, which is disposed in close contact with the insulating plate 150a and sandwiches the insulating plate 150a and is disposed opposite to the battery stack 110. The face pressing plate 150b can be made of a metal or alloy material. As an example, the face pressing plate 150b can be manufactured by stamping aluminum. On the other hand, in the insulating plate 150a and the face pressing plate 150b, the above - mentioned bending region 154 and blocking region 156 can be formed only in the face pressing plate 150b.

[0127] Continuing to refer to Figure 6 , the insulating plate 150a can include: an insulating plate main body region 150a - 1, which is disposed in close contact with the battery stack 110; and an insulating plate protruding region 150a - 2, which protrudes from the insulating plate main body region 150a - 1 in a direction away from the battery stack 110, that is, in a direction toward the face pressing plate 150b.

[0128] In addition, a through - hole having a shape corresponding to the insulating plate protruding region 150a - 2 can be formed on the face pressing plate 150b, and the insulating plate protruding region 150a - 2 can pass through the face pressing plate 150b through the above - mentioned through - hole formed in the face pressing plate 150b. In Figure 5As shown, when the insulating plate 150a and the surface pressing plate 150b are assembled, the insulating plate protruding region 150a-2 protrudes outward through the through hole of the surface pressing plate 150b. As an example, as Figure 6 shown, a plurality of insulating plate protruding regions 150a-2 can be formed. At this time, the combination between the insulating plate 150a and the surface pressing plate 150b can be made more stable through the insulating plate protruding region 150a-2.

[0129] On the other hand, the insulating plate 150a and the surface pressing plate 150b can be adhered to each other. This can be achieved by coating an adhesive substance on the insulating plate 150a or the surface pressing plate 150b, or can also be achieved by double-sided tape. However, different from the above, the insulating plate 150a and the surface pressing plate 150b may not be adhered, but only maintain a simply closely contacting state.

[0130] As described above, in the battery pack 10, the extension member 200 can be disposed in close contact with the end plate portion 150. More preferably, the extension member 200 can be disposed in close contact with the surface pressing plate 150b of the end plate portion 150. At this time, according to the present invention, there can also be a feature for making it easier to assemble the extension member 200 to the end plate portion 150 during the manufacturing process of the battery pack 10.

[0131] That is, referring to Figure 10 and Figure 12 , the extension member 200 can include an extension member main body region 210 disposed in close contact with the surface pressing plate 150b. The extension member main body region 210 can include: a first thickness interval 211 having a first thickness t1 in the direction toward the surface pressing plate 150b; and a second thickness interval 212 having a second thickness t2 in the direction toward the surface pressing plate 150b. At this time, the second thickness t2 can be smaller than the first thickness t1. This can be understood as that in the extension member main body region 210, the second thickness interval 212 has a relatively recessed shape compared with the first thickness interval 211.

[0132] According to the present invention, in the extension member main body region 210, the second thickness interval 212 can be a structure for providing a path for the extension member 200 to slidably engage with the end plate portion 150 during the process of assembling the extension member 200 to the end plate portion 150.

[0133] To achieve the above object, according to the present invention, when the arrangement direction of the battery sub-pack 100 in the battery pack 10 is defined as the horizontal direction, the above-mentioned second thickness interval 212 may be formed at the upper end or the lower end of the region in the extension member main body region 210 that is opposite to the insulating plate protruding region 150a-2. At this time, the width of the second thickness interval 212 formed at the upper end or the lower end in the extension member main body region 210 may be larger than the width of the insulating plate protruding region 150a-2. More preferably, the width of the second thickness interval 212 formed at the upper end or the lower end in the extension member main body region 210 may correspond to the width of the insulating plate protruding region 150a-2. As an example, in Figure 12 it is shown that the second thickness intervals 212 are respectively formed at the upper end and the lower end of the region in the extension member main body region 210 that is opposite to the insulating plate protruding region.

[0134] Referring to Figure 8 , Figure 10 and Figure 12 , the partial manufacturing process of the battery pack 10 of the present invention can be carried out as follows. The first battery sub-pack 100a and the second battery sub-pack 100b are respectively arranged in the tray main body region 310 of the tray portion 300. At this time, the first fastening region 151a of the first end plate portion 151 of the first battery sub-pack 100a and the second fastening region 152a of the second end plate portion 152 of the second battery sub-pack 100b are respectively arranged on the inner protruding region 320 of the tray portion 300.

[0135] After that, the extension member 200 is inserted into the space between the first battery sub-pack 100a and the second battery sub-pack 100b. At this time, the insulating plate protruding region 150a-2 formed on the first end plate portion 151 of the first battery sub-pack 100a and the insulating plate protruding region 150a-2 formed on the second end plate portion 152 can pass through the second thickness interval 212 of the extension member 200. On the contrary, the first thickness interval 211 with a thickness greater than the second thickness interval 212 is not allowed to pass through the insulating plate protruding region 150a-2 formed on the first end plate portion 151 of the first battery sub-pack 100a and the insulating plate protruding region 150a-2 formed on the second end plate portion 152. Therefore, through the interference between the first thickness interval 211 and the insulating plate protruding region 150a-2, the extension member 200 slides along a predetermined path and is arranged within the predetermined range designed on the internal space of the tray portion 300.

[0136] On the other hand, as described above, the extension member 200 can be disposed in close contact with the first end plate portion 151 disposed at the first end of the first battery sub-pack 100a and the second end plate portion 152 disposed at the second end of the second battery sub-pack 100b, respectively. Therefore, in order to ensure the assemblability with respect to the first end plate portion 151 and the assemblability with respect to the second end plate portion 152 at the same time, preferably, in the extension member 200, the recessed regions formed in the second thickness interval t2 are formed on both sides of the extension member 200 at the same time.

[0137] On the other hand, as described above, the extension member 200 can apply pressure to the battery sub-pack 100 through the end plate portion 150. Therefore, the insulating plate protruding region 150a-2 can be disposed in close contact with the extension member main body region 210.

[0138] At this time, referring to Figure 3 , Figure 8 and Figure 12 , in the extension member main body region 210, a groove region 210a having a recessed shape can be formed on the region where the insulating plate protruding region 150a-2 is in close contact. In particular, the groove region 210a can communicate with the above-described second thickness interval 212. At this time, after the extension member 200 slides along the end plate portions 150, 151, and 152 through the second thickness interval 212, the insulating plate protruding region 150a-2 of the end plate portion 150 can be placed in the groove region 210a. As an example, as Figure 3 , Figure 8 and Figure 12 shown, the second thickness interval 212 and the groove region 210a can communicate in the vertical direction. For example, the thickness of the extension member main body region 210 in the second thickness interval 212 and the thickness of the extension member main body region 210 in the groove region 210a can be the same or correspond to each other.

[0139] On the other hand, according to the present invention, a plurality of battery stacks 110 can be provided in one battery sub-pack 100. That is, as Figure 4 and Figure 5 shown, in one battery sub-pack 100, the battery stack 110 can include a first battery stack 111 and a second battery stack 112 separately disposed in one direction from the first battery stack 111. As an example, the arrangement direction of the plurality of battery sub-packs 100 in the battery pack 10 and the stacking direction of the plurality of batteries in one battery stack 110 and the direction in which the plurality of battery stacks 111 and 112 are spaced apart from each other in one battery sub-pack 100 can be perpendicular or cross each other. On the other hand, the above description of the battery stack 110 also applies to the first battery stack 111 and the second battery stack 112.

[0140] At this time, as Figure 5 and Figure 6As shown, according to an example of the present invention, in the end plate portions 150 respectively disposed on both sides of the battery stack 110 within a battery sub-pack 100, a surface pressing plate 150b is provided. On the contrary, a plurality of insulating plates 150a can be provided. More specifically, in the end plate portions 150 respectively disposed on both sides of the battery stack 110 within a battery sub-pack 100, the length of the surface pressing plate 150b can correspond to the sum of the following parts: i) the length of the first battery stack 111; ii) the length of the second battery stack 112; and iii) the spacing distance between the first battery stack 111 and the second battery stack 112. Generally speaking, the length of the surface pressing plate 150b of the end plate portions 150 respectively disposed on both sides of the battery stack 110 within the battery sub-pack 100 can correspond to the sum of the lengths of the multiple battery stacks within the battery sub-pack 100 and the spacing distance between two adjacent battery stacks. In contrast, in the end plate portions 150 respectively disposed on both sides of the battery stack 110 within a battery sub-pack 100, the length of each insulating plate 150a can respectively match the lengths of the first battery stack 111 and the second battery stack 112 corresponding to the insulating plate 150a. However, differently, one insulating plate 150a can also be provided within one end plate portion 150.

[0141] On the other hand, as described above, in a battery sub-pack 100, when the battery stack 110 includes a first battery stack 111 and a second battery stack 112, the extension members 200 can be respectively disposed in close contact with the end plate portion disposed for the first battery stack 111 and the end plate portion disposed for the second battery stack 112.

[0142] On the other hand, as Figure 3 , Figure 5 and Figure 12 shown, in the extension member main body region 210 of the extension member 200, in the interval corresponding to the spacing between the first battery stack 111 and the second battery stack 112 within a battery sub-pack 100, it has a lower height in the up and down direction compared to other regions, so that a recessed interval 210b having a recessed shape can be formed. In addition, in the surface pressing plate 150b of the end plate portion 150, the region corresponding to the above recessed interval 210b has a smaller width in the up and down direction compared to other regions, so that another recessed interval 150b-1 having a recessed shape can be formed.

[0143] As Figure 3As shown, the battery pack 10 can further include a component module 700 extending along the arrangement direction of the plurality of battery sub - packs 100 and the plurality of extension members 200. The component module 700 can include a bus bar for electrically connecting the battery pack 10 to the outside, components for providing communication between the battery pack 10 and the outside, etc. At this time, the component module 700 can be disposed in the recessed section 210b of the extension member main body area 210 and the recessed section 150b - 1 of the surface pressing plate 150b. That is, the recessed section 210b of the extension member main body area 210 and the recessed section 150b - 1 of the surface pressing plate 150b can be used to form a space for disposing the component module 700.

[0144] On the other hand, as Figure 8 and Figure 10 shown, according to the present invention, in the battery pack 10, the coupling members between the end plate portion 150, the extension member 200, and the tray portion 300 can include other structures in addition to the above - mentioned side coupling members 400. That is, the coupling members can further include a floor coupling member 500 for fastening the end plate portion 150, the extension member 200, and the tray main body area 310 of the tray portion 300. At this time, the floor coupling member 500 can be fastened to the extension member main body area 210 of the extension member 200, the blocking area 156 provided in the end plate portion 150, and the tray main body area 310. More preferably, as Figure 8 and Figure 10 shown, the floor coupling member 500 can pass through the blocking areas 156 respectively provided in the first end plate portion 151 and the second end plate portion 152 which are oppositely disposed to each other, and the extension member main body area 210 provided between the first end plate portion 151 and the second end plate portion 152, and be fastened to the tray main body area 310. On the other hand, as an example, as Figure 8 and Figure 10 shown, the area in the extension member main body area 210 fastened to the floor coupling member 500 can have a shape recessed downward. Additionally, as an example, the floor coupling member 500 can be inserted into the upper surface of the tray main body area 310 and be fastened, and be separately provided upward from the lower surface of the tray main body area 310. This can be understood as the floor coupling member 500 being fastened to the tray main body area 310 in a state of not passing through the tray main body area 310 in the up - and - down direction.

[0145] The floor coupling member 500 can not only function to fix the battery sub-pack 100 to the extension member 200 and the tray portion 300, but also function to apply surface pressure to the multiple batteries of the battery stack 110 disposed in the battery sub-pack 100. That is, since the floor coupling member 500 is fastened to the tray main body region 310 through the extension member main body region 210, the extension member main body region 210 in close contact with the end plate portion 150 functions to apply pressure to the end plate 150. Therefore, the force applied by the extension member main body region 210 to the end plate 150 can be transmitted to the multiple batteries in the battery stack 110, whereby a specific surface pressure can be applied to the batteries.

[0146] On the other hand, according to an example of the present invention, the sensing block 120 can further include a structure for generating a blocking action with the end plate portion 150 when the end plate portion 150 is assembled to the side of the battery sub-pack 100, so as to prevent the end plate portion 150 from deviating from a predetermined position. That is, as Figure 5 shown, in the sensing block 120, a blocking protrusion 122 protruding toward the end plate portion 150 can also be formed in a region opposite to the end plate portion 150. For example, the blocking protrusion 122 can be located at a position lower than the end plate portion 150 in a region opposite to the end plate portion 150. At this time, during the manufacturing process of the battery pack 10, when the end plate portion 150 is assembled to one side of the battery stack 110, it is possible to prevent the end plate portion 150 from moving downward relative to the battery stack 110 and deviating from a predetermined range.

[0147] On the other hand, in this specification, for the sake of convenience in description, the up-down direction and the horizontal direction are defined and the battery pack is described, but it should be noted that the above up-down direction and horizontal direction are not based on the actual installation state of the battery pack. That is, the battery pack of the present invention can also be assembled to other devices (such as an automobile) and used in a state different from the up-down direction defined in this specification (for example, a state of being upside down).

[0148] As mentioned above, although the present invention has been described through limited embodiments and drawings, the present invention is not limited thereto, and those skilled in the art can make various modifications and deformations without departing from the essential characteristics of the present invention.

Claims

1. A battery pack, comprising: A battery sub-pack, comprising: A battery stack having a structure in which a plurality of batteries including electrodes and separators are stacked in one direction, and An end plate portion is disposed in close contact with the battery stack; an extension member disposed in close contact with the end plate portion; and a tray portion, which accommodates the battery sub-pack and the extension member; Wherein, the end plate portion, the extension component and the tray portion are fixedly combined with each other.

2. The battery pack according to claim 1, wherein: The end plate and the extension member are respectively formed with through holes. The battery pack further includes a coupling member passing through the through holes respectively formed in the end plate portion and the extension member. Wherein, the end plate portion, the extension component and the tray portion are fixedly connected to each other through the connecting component.

3. The battery pack according to claim 2, wherein: The tray portion comprises: a tray body region, which forms an inner space for accommodating the battery sub-pack and the extension member; and an inner protruding area, which protrudes from an inner side defining the inner space toward the inner space in the tray body area, The combining component comprises: A side joint component is fastened to the end plate portion, the extension component, and the inner protruding area.

4. The battery pack according to claim 1, wherein: The battery sub-pack includes a first battery sub-pack and a second battery sub-pack spaced apart from the first battery sub-pack in one direction. The extension member is disposed between an end plate portion disposed on the first battery sub-pack and an end plate portion disposed on the second battery sub-pack. The end plate portion disposed on the first battery sub-pack, the end plate portion disposed on the second battery sub-pack, the extension component, and the tray portion are fixedly combined with each other.

5. The battery pack according to claim 3, wherein: The battery sub-pack includes a first battery sub-pack and a second battery sub-pack spaced apart from the first battery sub-pack in one direction. The extension member is disposed between an end plate portion disposed on the first battery sub-pack and an end plate portion disposed on the second battery sub-pack. The end plate portion disposed on the first battery sub-pack, the end plate portion disposed on the second battery sub-pack, the extension member, and the tray portion are fixedly coupled to each other by being fastened to the side coupling member.

6. The battery pack according to claim 5, wherein: The end plate portion comprises: A first end plate portion is provided in close contact with one side of the battery stack; and a second end plate portion, which is arranged in close contact with the other side of the battery stack and is arranged opposite to the first end plate portion so as to sandwich the battery stack; The extension member is respectively disposed in close contact with the first end plate portion disposed on the first battery sub-pack and the second end plate portion disposed on the second battery sub-pack, The first end plate portion disposed on the first battery sub-pack, the second end plate portion disposed on the second battery sub-pack, the extension member, and the tray portion are fixedly coupled to each other by being fastened to the side coupling member.

7. The battery pack according to claim 6, wherein: The first end plate portion includes a first fastening area, the first fastening area is formed with a through hole for the side coupling member to pass through, and the first fastening area extends toward the inner protruding area, The second end plate portion includes a second fastening area, the second fastening area is formed with a through hole for the side combining member to pass through, and the second fastening area extends toward the inner protruding area, The lower surface of the first fastening area is arranged to be opposite to the upper surface of the inner protruding area, A lower surface of the second fastening region is disposed opposite to an upper surface of the first fastening region.

8. The battery pack according to claim 7, wherein: The extension component comprises: an extension member main body region, which is disposed in close contact with the end plate portion; and a third fastening region extending from the main region of the extension component and having a through hole formed therein for the side coupling component to pass through; Wherein, the lower surface of the third fastening area is arranged to be opposite to the upper surface of the second fastening area.

9. The battery pack according to claim 1, wherein: The end plate portion comprises: an end plate main body region disposed in close contact with the battery stack; and a curved region extending from the end plate body region and curving toward the battery stack, Wherein, along the direction in which the bent region extends from the end plate main body region, the bent region and at least a portion of the battery stack overlap each other.

10. The battery pack according to claim 2, wherein: The end plate portion comprises: an end plate main body region disposed in close contact with the battery; and a blocking region that bends from the end plate main body region toward the extension member, Wherein, along the direction in which the blocking area extends from the end plate main body area, at least a portion of the blocking area and the extension component overlap with each other.

11. The battery pack according to claim 1, wherein: The end plate portion comprises: an insulating plate provided in close contact with the battery stack and comprising a material having electrical insulation properties; and A face pressing plate is arranged in close contact with the insulating plate and is arranged opposite to the battery stack with the insulating plate sandwiched therebetween.

12. The battery pack according to claim 11, wherein: The insulating plate comprises: an insulating plate main body region disposed in close contact with the battery stack; and an insulating plate protruding region protruding from the insulating plate main region in a direction away from the battery stack, The surface pressing plate is provided with a through hole having a shape corresponding to the protruding area of ​​the insulating plate. The insulating plate protruding region is coupled to the surface pressing plate through the through hole of the surface pressing plate.

13. The battery pack according to claim 12, wherein: A plurality of insulating plate protruding regions are formed.

14. The battery pack according to claim 12, wherein: The extension component includes an extension component main body area arranged in close contact with the surface pressure plate, The extension component main body area includes: A first thickness interval, the thickness of which in a direction toward the surface pressure plate is a first thickness; and The second thickness interval has a thickness in the direction toward the surface pressure plate as the second thickness, Wherein, the second thickness is smaller than the first thickness.

15. The battery pack according to claim 14, wherein: The second thickness interval is formed at the upper end or the lower end of the region of the extension member body region opposite to the protruding region of the insulating plate, The width of the second thickness section formed at the upper end or the lower end of the extension member main body region is greater than the width of the insulating plate protruding region.

16. The battery pack according to claim 14, wherein: The second thickness interval is formed at the upper end or the lower end of the region of the extension member body region opposite to the protruding region of the insulating plate, The width of the second thickness section formed at the upper end or the lower end of the extension member body region corresponds to the width of the insulating plate protruding region.

17. The battery pack according to claim 15, wherein: The second thickness range is formed at an upper end portion and a lower end portion of a region of the extension member body region that is opposite to the insulating plate protruding region.

18. The battery pack according to claim 14, wherein: The insulating plate protruding region is disposed in close contact with the extension member main body region.

19. The battery pack according to claim 11, wherein: In one of the battery sub-packs, the battery stack includes: a first battery stack; and a second battery stack provided separately from the first battery stack, Among them, in a battery sub-pack, a surface pressure plate is arranged in the end plate parts respectively arranged on both sides of the battery stack.

20. The battery pack according to claim 19, wherein: The extension member includes an extension member main body region which is arranged in close contact with the end plate portion, In the extension member main body region, a recessed region is formed in a region corresponding to the interval between the first battery stack and the second battery stack in one battery sub-pack. The recessed region has a lower height in the vertical direction than other regions, and thus has a downwardly recessed shape.

21. The battery pack according to claim 10, wherein: The tray portion includes a tray body region, wherein the tray body region forms an inner space for accommodating the battery sub-pack and the extension member. The coupling member includes a floor coupling member for fastening the end plate portion, the extension member, and the tray body region.

22. The battery pack according to claim 11, wherein: A plurality of battery stacks are arranged in the battery sub-pack. The direction in which the plurality of battery stacks are spaced apart from each other in the battery sub-pack and the direction in which the plurality of batteries are stacked in the battery stack intersect each other, In the battery sub-pack, the length of the surface pressure plate corresponds to the sum of the lengths of the plurality of battery stacks in the battery sub-pack and the spacing distance between two adjacent battery stacks.

23. The battery pack according to claim 21, wherein: The floor connecting member is provided so as to be inserted into the upper surface of the pallet body region and to be spaced upward from the lower surface of the pallet body region.

24. The battery pack according to claim 21, wherein: The floor connecting member is fastened to the blocking region provided on the end plate portion, an extension member body region forming a body of the extension member, and the tray body region.

25. The battery pack according to claim 24, wherein: The area of ​​the extension member body region to which the floor connecting member is fastened has a shape that is concave downward.

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