Battery pack

Abstract

The technical idea of the present invention provides a battery pack including: a first cell assembly including a plurality of first battery cells; a pack frame including a base frame supporting the first cell assembly and a side frame facing a side portion of the first cell assembly and extending in a first direction; an inner frame extending in a second direction crossing the first direction in an inner space of the pack frame; and a bonding layer bonding the side frame to the inner frame and exposed to the outside of the pack frame.

Description

battery pack

[0001] The present invention relates to a battery pack.

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0044443, filed April 2, 2024, and all contents of the document in that Republic of Korea Patent Application are incorporated herein by reference.

[0003] A battery cell is the basic unit of a secondary battery, comprising an anode, cathode, and separator. Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as a power source for various wireless devices, such as handsets, laptops, and cordless vacuum cleaners. Recently, battery packs equipped with battery cells have been widely used in mobility devices such as electric vehicles. Battery packs are required to have a compact structure and high energy density.

[0004] The technical problem to be solved by the present invention is to provide a battery pack.

[0005] In order to solve the above-described problem, the technical idea of ​​the present invention provides a battery pack including: a first cell assembly including a plurality of first battery cells; a pack frame including a base frame supporting the first cell assembly and a side frame facing a side of the first cell assembly and extending in a first direction; an internal frame extending in a second direction intersecting the first direction within an internal space of the pack frame; and a bonding layer bonding the side frame to the internal frame and exposed to the outside of the pack frame.

[0006] In exemplary embodiments, the side frame includes a hole aligned in the second direction in the inner frame, and the bonding layer is characterized in that it is disposed within the hole of the side frame.

[0007] In exemplary embodiments, the side frame includes an inner wall in contact with the inner frame; an outer wall exposed to the outside of the pack frame; and a first space provided between the inner wall and the outer wall; wherein the bonding layer is within the inner wall of the side frame.

[0008] In exemplary embodiments, the outer wall of the side frame includes a through hole communicating with the first space of the side frame, and the bonding layer is characterized in that it is exposed to the outside of the pack frame through the through hole of the outer wall of the side frame.

[0009] In exemplary embodiments, the inner frame includes an outer wall providing a second space; and an inner wall disposed within the second space of the outer wall; wherein the bonding layer is characterized in that it is connected to the inner wall of the inner frame.

[0010] In exemplary embodiments, the bonding layer extends in a third direction along the inner wall of the inner frame, a length of the bonding layer along the third direction being greater than a length of the bonding layer along the first direction, and the third direction being perpendicular to the first direction and the second direction.

[0011] In exemplary embodiments, the bonding layer extends in the first direction along the inner wall of the inner frame, a length of the bonding layer along the first direction being greater than a length of the bonding layer along the third direction, and the third direction being perpendicular to the first direction and the second direction.

[0012] In exemplary embodiments, the bonding layer is characterized in that it is spaced apart from the outer wall of the inner frame.

[0013] In exemplary embodiments, the bonding layer is characterized by comprising a metal.

[0014] In exemplary embodiments, the device further comprises a second cell assembly disposed on the base frame and including a plurality of second battery cells, the second cell assembly being spaced apart from the first cell assembly with the inner frame interposed therebetween.

[0015] In exemplary embodiments, the pack frame further comprises a pack cover fastened to the side frame so as to cover the first cell assembly.

[0016] In order to solve the above-described problem, the technical idea of ​​the present invention is a battery pack including: a cell assembly including a plurality of battery cells; a pack frame including a base frame supporting the cell assembly and a side frame facing a side of the cell assembly and extending in a first direction, the side frame including a hole; an internal frame extending in a second direction intersecting the first direction within an internal space of the pack frame; and a bonding layer disposed within the hole of the side frame and bonding the side frame to the internal frame.

[0017] In exemplary embodiments, the side frame is characterized by including an inner wall contacting the inner frame and including the hole filled with the bonding layer; an outer wall including a through hole aligned in the second direction in the bonding layer; and a first space provided between the inner wall and the outer wall.

[0018] In exemplary embodiments, the inner frame includes an outer wall providing a second space; and an inner wall disposed within the second space of the outer wall; wherein the bonding layer is characterized in that it extends along the inner wall of the inner frame.

[0019] In exemplary embodiments, the bonding layer is characterized by comprising a metal.

[0020] According to exemplary embodiments of the present invention, since the bonding layer does not occupy the internal space of the pack frame, bonding between the side frame and the internal frame can be achieved without loss of energy density of the battery pack due to the bonding layer occupying the internal space of the pack frame.

[0021] According to exemplary embodiments of the present invention, welding for joining the side frame and the inner frame is performed on the outside of the pack frame, thereby preventing the inside of the pack frame from becoming contaminated during welding.

[0022] The effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing 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 an exploded perspective view showing a battery pack according to exemplary embodiments of the present invention.

[0024] FIG. 2 is a perspective view showing a portion of the battery pack of FIG. 1.

[0025] FIG. 3 is a cross-sectional view showing a joint portion between an inner frame and a side frame in a battery pack according to exemplary embodiments of the present invention.

[0026] FIG. 4 is a perspective view showing an internal frame of a battery pack according to exemplary embodiments of the present invention.

[0027] FIG. 5 is a cross-sectional view showing a joint portion between an inner frame and a side frame in a battery pack according to exemplary embodiments of the present invention.

[0028] FIG. 6 is a perspective view showing an internal frame of a battery pack according to exemplary embodiments of the present invention.

[0029] FIGS. 7A and 7B are cross-sectional views illustrating a method for manufacturing a battery pack according to exemplary embodiments of the present invention.

[0030] FIGS. 8A and 8B are cross-sectional views illustrating a method for manufacturing a battery pack according to exemplary embodiments of the present invention.

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0032] Accordingly, 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. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0033] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0034] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0035]

[0036] (Example 1)

[0037] FIG. 1 is an exploded perspective view illustrating a battery pack (10) according to exemplary embodiments of the present invention. FIG. 2 is a perspective view illustrating a portion of the battery pack (10) of FIG. 1. FIG. 3 is a cross-sectional view illustrating a joint portion between an inner frame (210) and a side frame (120) in a battery pack (10) according to exemplary embodiments of the present invention. FIG. 4 is a perspective view illustrating an inner frame (210) of a battery pack (10) according to exemplary embodiments of the present invention.

[0038] Referring to FIGS. 1 to 4, a battery pack (10) may include a pack frame (100), an inner frame (210), a plurality of cell assemblies (300), and a bonding layer (230).

[0039] The pack frame (100) may have an internal space (160) that accommodates a plurality of cell assemblies (300). The pack frame (100) may include a base frame (110), a side frame (120), a front frame (130), a rear frame (140), and a pack cover (150).

[0040] A base frame (110) can support a plurality of cell assemblies (300). The base frame (110) can have a flat plate shape extending in a first horizontal direction (e.g., X direction) and a second horizontal direction (e.g., Y direction). The base frame (110) can include a cooling channel configured to allow a cooling fluid to flow. A cooling fluid provided from the outside of the base frame (110) can be supplied to an inlet of the cooling channel, flow along the cooling channel, and discharged to the outside through an outlet of the cooling channel. While the cooling fluid flows along the cooling channel, cooling of the cell assemblies (300) can be performed. The cooling fluid can include a coolant and / or a refrigerant.

[0041] A side frame (120) may be coupled to a base frame (110). The side frame (120) may extend in a first horizontal direction (e.g., X-direction) along an edge of the base frame (110). The side frame (120) may face a side of at least one corresponding cell assembly (300) among a plurality of cell assemblies (300). The pack frame (100) may include a pair of side frames (120) spaced apart from each other with a plurality of cell assemblies (300) therebetween. The pair of side frames (120) may be spaced apart from each other in a second horizontal direction (e.g., Y-direction) intersecting the first horizontal direction (e.g., X-direction).

[0042] The side frame (120) may include an inner wall (121), an outer wall (123), and an inner space (127) provided between the inner wall (121) and the outer wall (123). The inner wall (121) of the side frame (120) may define an inner space (160) of the pack frame (100). The inner wall (121) of the side frame (120) may be connected to the inner frame (210). The outer wall (123) of the side frame (120) may be exposed to an outer space (291) on the outside of the pack frame (100). The side frame (120) may be manufactured, for example, through an extrusion process.

[0043] A front frame (130) may be coupled to a base frame (110). The front frame (130) may extend along a frontside edge of the base frame (110). The front frame (130) may extend in a second horizontal direction (e.g., Y direction) between a pair of side frames (120).

[0044] The rear frame (140) may be coupled to the base frame (110). The front frame (130) may extend along a backside edge of the base frame (110). The rear frame (140) may extend in a second horizontal direction (e.g., in the Y direction) between a pair of side frames (120). The rear frame (140) may be spaced apart from the front frame (130) in a first horizontal direction (e.g., in the X direction) with a plurality of cell assemblies (300) therebetween.

[0045] The rear frame (140), the front frame (130), and a pair of side frames (120) can form a square-ring shaped peripheral wall surrounding a plurality of cell assemblies (300).

[0046] The pack cover (150) can be coupled to the rear frame (140), the front frame (130), and a pair of side frames (120) to cover a plurality of cell assemblies (300). The pack cover (150) can have a flat plate shape extending in a first horizontal direction (e.g., X direction) and a second horizontal direction (e.g., Y direction).

[0047] An inner frame (210) may be disposed within an inner space (160) of a pack frame (100). The inner frame (210) may be connected to a base frame (110) and may extend in a second horizontal direction (e.g., Y direction) between a pair of side frames (120). The inner frame (210) may be connected to each of the pair of side frames (120). One or more inner frames (210) may be disposed within the pack frame (100). The inner frame (210) may partition or separate the inner space (160) of the pack frame (100) into a plurality of sub-spaces. At least one cell assembly (300) may be disposed in the plurality of sub-spaces of the pack frame (100) provided by the inner frame (210). Among the plurality of cell assemblies (300), some of the cell assemblies (300) may be spaced apart in a first horizontal direction (e.g., X direction) with the inner frame (210) therebetween.

[0048] The inner frame (210) may include an outer wall (211) providing an inner space (217), a first inner wall (213) provided within the inner space (217) of the outer wall (211), and a second inner wall (215) provided within the inner space (217) of the outer wall (211). The outer wall (211) of the inner frame (210) may form an outer appearance of the inner frame (210) and may be connected to a side of the cell assembly (300). An extension direction of the first inner wall (213) and an extension direction of the second inner wall (215) may intersect each other. When viewed in cross section, the first inner wall (213) may extend in a vertical direction (e.g., a Z direction), and the second inner wall (215) may extend in a first horizontal direction (e.g., an X direction). The inner frame (210) may be manufactured, for example, through an extrusion process.

[0049] A plurality of cell assemblies (300) may be mounted on a base frame (110). The plurality of cell assemblies (300) may be arranged in a first horizontal direction (e.g., X direction) and / or a second horizontal direction (e.g., Y direction) on the base frame (110). Each cell assembly (300) may correspond to a battery module or a cell-to-pack unit.

[0050] An individual battery cell (310) is a basic unit of a lithium ion battery, i.e., a secondary battery. An individual battery cell (310) may include an electrode assembly, an electrolyte, and a cell case. The electrode assembly built into the cell case may include a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The electrode assembly may be either a jelly-roll type or a stack type depending on the assembly form. A jelly-roll type electrode assembly may include a winding structure of a positive electrode, a negative electrode, and a separator interposed therebetween. A stack type electrode assembly may include a plurality of sequentially stacked positive electrodes, a plurality of negative electrodes, and a plurality of separators interposed therebetween. The positive electrode may include a positive electrode current collector and a positive electrode active material. The negative electrode may include a negative electrode current collector and an negative electrode active material.

[0051] Each battery cell (310) may be a pouch-type battery cell, a cylindrical battery cell, or a square battery cell. The electrode assembly of the pouch-type battery cell is housed in a pouch case including an aluminum laminate sheet. The electrode assembly of the cylindrical battery cell is housed in a cylindrical metal can. The electrode assembly of the square battery cell is housed in a square metal can.

[0052] A plurality of battery cells (310) provided in each cell assembly (300) may be connected in series and / or in parallel. For example, a plurality of battery cells (310) may be connected in series with each other. For example, a plurality of battery cells (310) may also be connected in parallel with each other. For example, when a set of two or more battery cells (310) connected in parallel with each other is defined as a bank, one bank composed of two or more battery cells (310) connected in parallel with each other and another bank composed of two or more battery cells (310) connected in parallel with each other may be connected in series.

[0053] In exemplary embodiments, a plurality of battery cells (310) may be arranged in a first horizontal direction (e.g., X direction), and individual battery cells (310) may extend in a second horizontal direction (e.g., Y direction). An electrode lead may be provided at an end of an individual battery cell (310) along the second horizontal direction (e.g., Y direction). The electrode leads of neighboring battery cells (310) among the plurality of battery cells (310) may be electrically and physically connected to each other.

[0054] The bonding layer (230) can bond between the side frame (120) and the inner frame (210). The bonding layer (230) can include metal. The bonding layer (230) can be formed through a welding process for bonding the side frame (120) to the inner frame (210). For example, the welding process for bonding the side frame (120) and the inner frame (210) can include arc welding, gas welding, electric resistance welding, and / or solid-state welding. For example, the welding process for bonding the side frame (120) and the inner frame (210) can include plug welding or friction stir welding.

[0055] The bonding layer (230) may include a welding metal. For example, the bonding layer (230) may include aluminum (Al), silver (Ag), copper (Cu), zinc (Zn), tin (Sn), or a combination thereof. The bonding layer (230) may contain a material of the side frame (120) and a material of the inner frame (210). The bonding layer (230) may include a weld bead. A heat affected zone may be provided at the interface between the bonding layer (230) and the side frame (120) and the interface between the bonding layer (230) and the inner frame (210).

[0056] The bonding layer (230) and the side frame (120) may have differences in at least one of material composition, crystal structure, and mechanical properties. In addition, the bonding layer (230) and the inner frame (210) may have differences in at least one of material composition, crystal structure, and mechanical properties. The mechanical properties may include, for example, ultimate tensile strength, yield strength, elongation, dislocation density, and the like.

[0057] The bonding layer (230) is provided within the side frame (120) and can be exposed to the external space (291) outside the pack frame (100). The bonding layer (230) is not exposed to the internal space (160) of the pack frame (100) in which the cell assemblies (300) are accommodated. The bonding layer (230) is provided within the side frame (120) and can be connected to the first inner wall (213) and / or the second inner wall (215) of the inner frame (210). The bonding layer (230) does not contact the outer wall (211) of the inner frame (210).

[0058] In exemplary embodiments, the bonding layer (230) may be provided within the inner wall (121) of the side frame (120). For example, the inner wall (121) of the side frame (120) may include a hole (1211) aligned with the inner frame (210) in a second horizontal direction (e.g., Y direction), and the bonding layer (230) may at least partially fill the hole (1211) of the inner wall (121). The bonding layer (230) may be exposed to the inner space (160) of the side frame (120). The outer wall (123) of the side frame (120) may include a through hole (1231) communicating with the inner space (127) of the side frame (120). The through hole (1231) of the outer wall (123) of the side frame (120) can be aligned with the bonding layer (230) in a second horizontal direction (e.g., Y direction), and the bonding layer (230) can be exposed to the outside of the pack frame (100) through the through hole (1231) of the outer wall (123) of the side frame (120).

[0059] The bonding layer (230) may have a line shape extending in one direction. The bonding layer (230) may extend linearly along the first inner wall (213) or the second inner wall (215) of the inner frame (210). In exemplary embodiments, the bonding layer (230) may extend vertically (e.g., in the Z direction) along the first inner wall (213) of the inner frame (210). The length of the bonding layer (230) along the vertical direction (e.g., in the Z direction) may be greater than the length of the bonding layer (230) along the first horizontal direction (e.g., in the X direction). The hole (1211) of the inner wall (121) of the side frame (120) can extend in a vertical direction (e.g., in the Z direction), and the bonding layer (230) can extend in a vertical direction (e.g., in the Z direction) along the hole (1211) of the inner wall (121) of the side frame (120).

[0060]

[0061] (Example 2)

[0062] Fig. 5 is a cross-sectional view showing a joint portion between an inner frame (210A) and a side frame (120A) in a battery pack according to exemplary embodiments of the present invention. Fig. 6 is a perspective view showing an inner frame (210A) of a battery pack according to exemplary embodiments of the present invention.

[0063] Referring to FIGS. 5 and 6 together with FIG. 1, the bonding layer (230) may extend in a first horizontal direction (e.g., X-direction) along the second inner wall (215) of the inner frame (210A). The length of the bonding layer (230) along the first horizontal direction (e.g., X-direction) may be greater than the length of the bonding layer (230) along the vertical direction (e.g., Z-direction). In exemplary embodiments, the hole (1211) of the inner wall (121) of the side frame (120A) may extend in the first horizontal direction (e.g., X-direction), and the bonding layer (230) may extend in the first horizontal direction (e.g., X-direction) along the hole (1211) of the inner wall (121) of the side frame (120A).

[0064]

[0065] (Example 3)

[0066] FIGS. 7A and 7B are cross-sectional views illustrating a method for manufacturing a battery pack (10) according to exemplary embodiments of the present invention. Hereinafter, a method for manufacturing a battery pack (10) according to exemplary embodiments will be described with reference to FIGS. 7A and 7B together with FIG. 1.

[0067] Referring to FIG. 7A, a side frame (120) and an inner frame (210) are placed on a base frame (110). The side frame (120) and the inner frame (210) can each be coupled to the base frame (110). The inner wall (121) of the side frame (120) can include a hole (1211), and the inner frame (210) can be placed on the base frame (110) such that the inner wall of the inner frame (210) is aligned with the hole (1211) of the inner wall (121) of the side frame (120) in a second horizontal direction (e.g., Y direction). The inner wall of the inner frame (210) can be exposed to the outside of the pack frame (100) through a hole (1211) of the inner wall (121) of the side frame (120), an internal space (127) of the side frame (120), and a through hole (1231) of the outer wall (123) of the side frame (120).

[0068] Referring to FIG. 7b together with FIG. 3, a bonding layer (230) is formed within a hole (1211) of an inner wall (121) of a side frame (120). The bonding layer (230) may be formed through plug welding. For example, a welding metal (e.g., a filler metal or a welding wire) may be injected into the hole (1211) of the inner wall (121) of the side frame (120), and the welding metal may be melted using a welding tool (410). The welding tool (410) may enter the inner space (127) of the side frame (120) through the through hole (1231) of the outer wall (123) of the side frame (120). When the molten welding metal solidifies, a bonding layer (230) that joins the side frame (120) and the inner frame (210) may be formed.

[0069] Next, referring to FIG. 1, a plurality of cell assemblies (300) can be mounted on a base frame (110), and a pack cover (150) can be fastened to a front frame (130), a rear frame (140), and a pair of side frames (120).

[0070] In a method for manufacturing a battery pack (10) according to exemplary embodiments, the step of joining the side frame (120) and the inner frame (210) described with reference to FIG. 7b may be performed after the step of mounting a plurality of cell assemblies (300) on the base frame (110) and the step of fastening the pack cover (150) to the side frame (120) are completed. A method for manufacturing a battery pack (10) according to exemplary embodiments may include a step of arranging a front frame (130), a rear frame (140), a pair of side frames (120), and an inner frame (210) on a base frame (110), a step of mounting a plurality of cell assemblies (300) on the base frame (110), a step of fastening a pack cover (150) to the front frame (130), the rear frame (140), and the pair of side frames (120), and a step of bonding between the side frame (120) and the inner frame (210) as described with reference to FIG. 7B.

[0071]

[0072] (Example 4)

[0073] FIGS. 8A and 8B are cross-sectional views illustrating a method for manufacturing a battery pack (10) according to exemplary embodiments of the present invention. Hereinafter, a method for manufacturing a battery pack (10) according to exemplary embodiments will be described with reference to FIGS. 8A and 8B together with FIG. 1.

[0074] Referring to Fig. 8a, a side frame (120) and an inner frame (210) are placed on a base frame (110). An end of the inner frame (210) can contact an inner wall (121) of the side frame (120). The contact between the end of the inner frame (210) and the inner wall (121) of the side frame (120) can form surface contact and be continuous in one direction.

[0075] Referring to FIG. 8B, a bonding layer (230) is formed in a hole (1211) of an inner wall (121) of a side frame (120). The bonding layer (230) may be formed through friction stir welding configured to bond the side frame (120) and the inner frame (210) based on frictional force and a plastic flow phenomenon of materials. For example, the welding tool (420) may correspond to a friction stir welding tool for performing friction stir welding. The welding tool (420) may enter the inner space (127) of the side frame (120) through the through hole (1231) of the outer wall (123) of the side frame (120). A probe at an end of the welding tool (420) may rotate while in contact with the inner wall (121) of the side frame (120) and move along a predetermined welding line. While the welding tool (420) rotates, frictional heat is generated that locally plastically flows the inner wall (121) of the side frame (120) and the inner wall of the inner frame (210), and the plastically deformed portion of the inner wall (121) of the side frame (120) and the plastically deformed portion of the inner wall of the inner frame (210) can be joined to form a bonding layer (230).

[0076] Next, referring to FIG. 1, a plurality of cell assemblies (300) can be mounted on a base frame (110), and a pack cover (150) can be fastened to a front frame (130), a rear frame (140), and a pair of side frames (120).

[0077] In the method for manufacturing a battery pack (10) according to exemplary embodiments, the step of joining the side frame (120) and the inner frame (210) described with reference to FIG. 8b may be performed after the step of mounting a plurality of cell assemblies (300) on the base frame (110) and the step of fastening the pack cover (150) to the side frame (120) are completed. A method for manufacturing a battery pack (10) according to exemplary embodiments may include a step of arranging a front frame (130), a rear frame (140), a pair of side frames (120), and an inner frame (210) on a base frame (110), a step of mounting a plurality of cell assemblies (300) on the base frame (110), a step of fastening a pack cover (150) to the front frame (130), the rear frame (140), and the pair of side frames (120), and a step of bonding between the side frames (120) and the inner frame (210) described with reference to FIG. 8B.

[0078] In the battery pack according to the comparative example, the welding process for forming a weld joint layer for joining the side frame to the inner frame is performed while a welding tool is inserted into the internal space of the pack frame. For example, the weld joint layer may extend along the interface between the side frame and the inner frame exposed to the internal space of the pack frame. In this case, the weld joint layer may occupy the internal space of the pack frame, which may reduce the energy density of the battery pack. In addition, since the welding process for forming the weld joint layer is performed while a welding tool is inserted into the internal space of the pack frame, there is a problem that the interior of the pack frame is contaminated by spatter generated during the welding process.

[0079] According to exemplary embodiments of the present invention, since the bonding layer (230) does not occupy the internal space (160) of the pack frame (100), bonding between the side frame (120) and the internal frame (210) can be achieved without loss of energy density of the battery pack (10) due to the bonding layer (230) occupying the internal space (160) of the pack frame (100).

[0080] According to exemplary embodiments of the present invention, welding for joining the side frame (120) and the inner frame (210) is performed on the outside of the pack frame (100), so that the inside of the pack frame (100) can be prevented from being contaminated during welding.

[0081] According to exemplary embodiments of the present invention, welding for joining between the side frame (120) and the inner frame (210) can be performed after completing fastening of the pack cover (150). In this case, since welding for joining between the side frame (120) and the inner frame (210) is performed in a state where the inner space (160) of the pack frame (100) is sealed, contamination of the interior of the pack frame (100) can be prevented during welding.

[0082] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. A first cell assembly comprising a plurality of first battery cells; A pack frame including a base frame supporting the first cell assembly and a side frame facing the side of the first cell assembly and extending in the first direction; An internal frame extending in a second direction intersecting the first direction within the internal space of the pack frame; and The side frame is joined to the inner frame, and the bonding layer is exposed to the outside of the pack frame; Battery pack containing.

2. In paragraph 1, The side frame includes a hole aligned in the second direction in the inner frame, A battery pack characterized in that the bonding layer is arranged within the hole of the side frame.

3. In paragraph 1, The above side frame, Inner wall in contact with the inner frame; The outer wall exposed to the outside of the above pack frame; and A first space provided between the inner wall and the outer wall; Including, A battery pack characterized in that the bonding layer is within the inner wall of the side frame.

4. In paragraph 3, The outer wall of the side frame includes a through hole communicating with the first space of the side frame, A battery pack characterized in that the bonding layer is exposed to the outside of the pack frame through the through hole of the outer wall of the side frame.

5. In paragraph 1, The above inner frame, an exterior wall providing a second space; and An inner wall disposed within the second space of the outer wall; Including, A battery pack characterized in that the bonding layer is connected to the inner wall of the inner frame.

6. In paragraph 5, The above bonding layer extends in a third direction along the inner wall of the inner frame, The length of the bonding layer along the third direction is greater than the length of the bonding layer along the first direction, A battery pack, characterized in that the third direction is perpendicular to the first direction and the second direction.

7. In paragraph 5, The above bonding layer extends in the first direction along the inner wall of the inner frame, The length of the bonding layer along the first direction is greater than the length of the bonding layer along the third direction, A battery pack, characterized in that the third direction is perpendicular to the first direction and the second direction.

8. In paragraph 5, A battery pack characterized in that the bonding layer is spaced apart from the outer wall of the inner frame.

9. In paragraph 1, A battery pack characterized in that the bonding layer comprises a metal.

10. In paragraph 1, Further comprising a second cell assembly disposed on the base frame and including a plurality of second battery cells, A battery pack, characterized in that the second cell assembly is spaced apart from the first cell assembly with the inner frame therebetween.

11. In paragraph 1, A battery pack characterized in that the pack frame further includes a pack cover fastened to the side frame so as to cover the first cell assembly.

12. A cell assembly comprising a plurality of battery cells; A pack frame comprising a base frame supporting the cell assembly and a side frame facing the side of the cell assembly and extending in a first direction, the side frame including a hole; An internal frame extending in a second direction intersecting the first direction within the internal space of the pack frame; and A bonding layer disposed within the hole of the side frame and bonding the side frame to the inner frame; Battery pack containing.

13. In paragraph 12, The above side frame, An inner wall contacting the inner frame and including the hole filled with the bonding layer; an outer wall including a through hole aligned in the second direction in the bonding layer; and A first space provided between the inner wall and the outer wall; A battery pack comprising:

14. In paragraph 13, The above inner frame, an exterior wall providing a second space; and An inner wall disposed within the second space of the outer wall; Including, A battery pack characterized in that the bonding layer extends along the inner wall of the inner frame.

15. In paragraph 12, A battery pack characterized in that the bonding layer comprises a metal.

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