Battery pack and device including the same

Abstract

A battery pack according to an embodiment of the present invention comprises: a plurality of battery cells; a battery pack frame including a bottom frame and a side frame, the bottom frame and the side frame forming a receiving space in which the battery cells are received; a spacer which is positioned on the bottom frame and on which the battery cells are mounted; a holding frame which is positioned on the spacer and has a hole into which the battery cell is inserted; and a refrigerant that flows in a space between the spacer and the holding frame to directly cool the battery cells inside the pack frame.

Description

Technical Field

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. KR10-2024-0013809, filed with the Korean Intellectual Property Office on January 30, 2024, the contents of which are incorporated herein by reference in their entirety.

[0003] This disclosure relates to a battery pack and an apparatus including the battery pack, and more particularly, to an immersion-cooled battery pack and an apparatus including the immersion-cooled battery pack. Background Technology

[0004] With the increasing development of mobile devices and the growing demand for them, the demand for secondary batteries as energy sources is also rapidly increasing. Therefore, much research has been conducted on secondary batteries to meet various needs.

[0005] Secondary batteries have attracted considerable attention as an energy source for power drive systems such as electric bicycles, electric vehicles, and hybrid electric vehicles, as well as for mobile devices such as mobile phones, digital cameras, and laptop computers.

[0006] Recently, with the increasing necessity for high-capacity secondary battery structures, including the use of secondary batteries as energy storage sources, the demand for battery packs formed by assembling multiple secondary batteries has been growing.

[0007] Meanwhile, when multiple battery cells are connected in series or parallel to form a battery pack, the battery pack is usually constructed by placing multiple battery cells in a battery pack frame and adding other components.

[0008] Because such battery cells consist of rechargeable and dischargeable secondary batteries, these high-output, high-capacity secondary batteries generate a significant amount of heat during charging and discharging. In this situation, the heat generated from a large number of battery cells accumulates in a confined space, causing the temperature to rise more rapidly and excessively. In other words, battery packs comprising a large number of battery cells can achieve high output, but it is difficult to dissipate the heat generated from the battery cells during charging and discharging. When heat dissipation of the battery cells is not properly implemented, battery cell degradation accelerates, lifespan is shortened, and the possibility of explosion or fire increases.

[0009] Furthermore, in the case of vehicle battery packs, they are often exposed to direct sunlight and may be placed under high-temperature conditions, such as in summer or desert areas. Additionally, because multiple battery modules are grouped together to increase vehicle range, flames or heat generated in one battery cell can easily spread to adjacent cells, potentially leading to a fire or explosion of the battery pack itself. Therefore, to effectively cool high-capacity battery packs, immersion cooling is used, where the coolant directly cools the individual battery cells inside the pack. Summary of the Invention

[0010] [Technical Issues]

[0011] Therefore, the object of this disclosure is to provide a battery pack and an apparatus including the battery pack, which can prevent coolant leakage and improve cooling performance by using immersion cooling of the battery cells directly by coolant.

[0012] However, the technical objectives to be addressed by the embodiments of this disclosure are not limited to those described above, and various extensions are possible within the scope of the technical concepts included in this disclosure.

[0013] [Technical Solution]

[0014] According to a specific aspect of this disclosure, a battery pack is provided, the battery pack comprising: a plurality of battery cells; a battery pack frame including a bottom frame and side frames forming a storage space in which the battery cells are stored; a spacer located on an upper portion of the bottom frame, and the battery cells being disposed on the spacer; a retaining frame located on an upper portion of the spacer and having holes therein into which the battery cells are fitted; and a coolant flowing in the space between the spacer and the retaining frame to directly cool the battery cells inside the battery pack frame.

[0015] A first waterproof adhesive may be applied to the upper part of the retaining frame.

[0016] In the region above the retaining frame, a busbar that guides the electrical connections between the battery cells can be connected to the electrode terminals of the battery cells.

[0017] At least a portion of the busbar may be surrounded by the first waterproof adhesive.

[0018] The battery pack may further include a battery pack cover that covers the open upper portion of the battery pack frame. The first waterproof adhesive may be applied to the space between the retaining frame and the battery pack cover.

[0019] Foam components may be disposed on the lower surface of the battery pack cover.

[0020] A second waterproof adhesive may be applied to the surface of the spacer facing the battery cell.

[0021] The battery pack may further include a lower battery pack cover that covers the lower part of the base frame. When viewed along the height direction, the joint line between the lower battery pack cover and the base frame may be formed along the outer periphery of the area where the battery cell is located.

[0022] The battery cell may have a vent.

[0023] The vent of the battery cell can face the spacer.

[0024] The spacer may include a spacer vent and an outer peripheral portion, the spacer vent being the portion facing the vent, and the outer peripheral portion surrounding the spacer vent. The spacer vent may have a thickness thinner than the outer peripheral portion or may have a notch.

[0025] The bottom frame may have a ventilation channel that guides ventilation gas or particles emitted from the ventilation section of the battery cell.

[0026] The bottom frame may include a first frame and a second frame located below the first frame. The ventilation channel may be formed between the first frame and the second frame.

[0027] Through holes can be formed in the first frame. When viewed along the height direction, the through holes can be positioned to at least partially overlap with the venting portion of the battery cell.

[0028] The vertical beams that divide the battery cells into multiple battery cell groups can be located on the bottom frame.

[0029] The ventilation channel corresponding to a battery cell group can have an independent ventilation flow path that is not shared with the ventilation channels corresponding to other battery cell groups.

[0030] The ventilation channel can be connected to a ventilation device installed in the side frame.

[0031] According to certain other aspects of this disclosure, an apparatus including the above-described battery pack is provided.

[0032] [Beneficial Effects]

[0033] According to a specific embodiment of this disclosure, in immersion cooling of battery cells using coolant for direct cooling, coolant leakage to the outside can be prevented and cooling performance can be improved because the coolant flows in the area between the spacer on which the battery cells are placed and the retaining frame with holes formed therein to which the battery cells fit.

[0034] In addition, when a thermal event occurs in a battery cell, the high-temperature ventilation gas, particles or flames emitted from the battery cell move along a specific pre-planned path through ventilation channels formed in the bottom frame and are discharged to the outside of the battery pack.

[0035] The effects of this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the description of the appended claims any additional effects not mentioned above. Attached Figure Description

[0036] Figure 1 and Figure 2 This is a perspective view of a battery pack according to a specific embodiment of the present disclosure.

[0037] Figure 3 It is shown that it includes Figure 1 and Figure 2 A perspective view of the battery pack frame within the battery pack.

[0038] Figure 4 This is a perspective view showing the state of the battery cell, spacer and retaining frame assembled according to a specific embodiment of the present disclosure.

[0039] Figure 5 This is a perspective view showing a battery cell and a retaining frame according to a specific embodiment of the present disclosure.

[0040] Figure 6 yes Figure 5 Exploded perspective view of the battery cell and retaining frame.

[0041] Figure 7 (a) and (b) are perspective and side views of a battery cell according to a specific embodiment of the present disclosure, respectively.

[0042] Figure 8 It shows along Figure 7 A cross-sectional view of the section cut by the cutting line AA in (a).

[0043] Figure 9 This is a cross-sectional view of a battery cell according to a specific embodiment of the present disclosure.

[0044] Figure 10 This is a cross-sectional perspective view of a battery pack according to a specific embodiment of the present disclosure.

[0045] Figure 11 It is shown Figure 10 A magnified cross-sectional view of part "B".

[0046] Figure 12 It is shown Figure 11 A magnified cross-sectional view of part "C".

[0047] Figure 13 It is shown Figure 11 A magnified cross-sectional view of part of the "D".

[0048] Figure 14 This is a perspective view showing a battery cell and a spacer according to a specific embodiment of the present disclosure.

[0049] Figure 15 This is a partial enlarged perspective view showing a spacer according to a specific embodiment of the present disclosure.

[0050] Figure 16 This is a cross-sectional perspective view of a battery pack frame according to a specific embodiment of the present disclosure.

[0051] Figure 17 It is shown Figure 16 A magnified cross-sectional view of part of the "E".

[0052] Figure 18 It is shown Figure 17 A magnified cross-sectional view of part of the "F".

[0053] Figure 19 This is a partial cross-sectional view of a battery pack according to a particular other embodiment of the present disclosure.

[0054] Figure 20 This is a perspective view showing the state of removing the first side frame in the battery pack frame according to a specific embodiment of the present disclosure.

[0055] Figure 21 This is an exploded perspective view of the base frame according to a specific embodiment of the present disclosure.

[0056] Figure 22 This is a plan view showing a battery cell and the welding lines around it according to a specific embodiment of the present disclosure.

[0057] Figure 23 This is a plan view showing a battery cell and a battery pack cover according to a specific embodiment of the present disclosure.

[0058] Figure 24 This is a partial perspective view showing a partial appearance of the base frame according to a specific embodiment of the present disclosure.

[0059] Figure 25 It shows from Figure 24 A partial perspective view of the state where the bottom frame of the first frame is removed.

[0060] Figure 26 It shows from Figure 25 A partial perspective view of the state where the bottom frame has been removed and the frame has been separated.

[0061] Figure 27 This is a plan view showing a partial appearance of the base frame according to a specific embodiment of the present disclosure.

[0062] Figure 28 It shows from Figure 27 A plan view showing the state of the bottom frame after the first frame has been removed. Detailed Implementation

[0063] In the following description, various embodiments of the present disclosure will be detailed to the extent that those skilled in the art will be able to readily practice it. The present disclosure may be implemented in a variety of different forms and is not limited to the embodiments described herein.

[0064] For clarity in describing this disclosure, descriptions of parts unrelated to this disclosure will be omitted, and identical or similar parts will be indicated by the same reference numerals throughout the description.

[0065] Because the accompanying drawings arbitrarily show the dimensions and thicknesses of each component for ease of description, this disclosure is not necessarily limited to what is shown. The drawings depict thicknesses at an enlarged scale to clearly show different layers and regions. Furthermore, the drawings exaggerate the thickness of specific layers or regions for ease of description.

[0066] When layers, films, regions, plates, etc., are placed "on" a specific part, the description includes not only cases where the layers, films, regions, plates, etc., are placed "directly" on the specific part, but also cases where the layers, films, regions, plates, etc., are placed on the specific part via another part. When one part is placed "directly" on another part, this indicates that there is no new component between the two parts. Furthermore, when a component is placed "on" a reference part, this indicates that the component exists on top of or below the reference part, and does not necessarily indicate that the component is placed only on the top of the reference part opposite to the direction of gravity.

[0067] Throughout this description, when a specific part “includes” a component, this does not indicate that the specific part excludes other components, but rather that the part may also include other components, unless otherwise defined.

[0068] Throughout this description, the term "in plan view" refers to an object viewed from above, and the term "in section view" refers to a vertical section of an object viewed from the side.

[0069] Figure 1 and Figure 2 This is a perspective view of a battery pack according to a specific embodiment of the present disclosure. Figure 3 It is shown that it includes Figure 1 and Figure 2 A perspective view of the battery pack frame within the battery pack. Figure 4 This is a perspective view showing the state of the battery cell, spacer and retaining frame assembled according to a specific embodiment of the present disclosure. Figure 5 This is a perspective view showing a battery cell and a retaining frame according to a specific embodiment of the present disclosure. Figure 6 yes Figure 5 Exploded perspective view of the battery cell and retaining frame.

[0070] Let's refer to each other. Figures 1 to 6 According to a specific embodiment of the present disclosure, a battery pack 100 includes: a plurality of battery cells 110; a battery pack frame 200, the battery pack frame 200 including a bottom frame 210 and side frames 220, the bottom frame 210 and side frames 220 forming a storage space for storing the battery cells 110; a spacer 300 located on the upper part of the bottom frame 210 and the battery cells 110 disposed on the spacer 300; a retaining frame 400 located on the upper part of the spacer 300 and having holes 400H formed therein for the battery cells 110 to fit into; and a coolant flowing in the space between the spacer 300 and the retaining frame 400 to directly cool the battery cells 110 inside the battery pack frame 200. In other words, the battery pack 100 according to this embodiment corresponds to an immersion-cooled battery pack 100 rather than a conventional indirect-cooled type. In the immersion-cooled battery pack, the coolant flows inside the battery pack frame 200 and contacts the battery cells 110 to directly cool the battery cells 110. In the conventional indirect-cooled type, a heat sink through which the coolant flows is provided in the battery pack.

[0071] In the battery pack 100 according to this embodiment, coolant flows in the space between the spacer 300 and the retaining frame 400, and coolant is prevented from flowing into other spaces. That is, the spacer 300 and the retaining frame 400 can define the space in which coolant flows, and can prevent coolant leakage into other spaces. The spacer 300 corresponds to the lower limit of coolant flow, and the retaining frame 400 corresponds to the upper limit of coolant flow. In this way, by preventing coolant leakage, the cooling performance and safety of the battery pack 100 can be improved simultaneously.

[0072] Next, the battery cell 110 according to this embodiment will be described in detail.

[0073] Figure 7 (a) and (b) are perspective and side views of a battery cell according to a specific embodiment of the present disclosure, respectively. Figure 8 It shows along Figure 7A cross-sectional view of the section cut by the cutting line AA in (a). Figure 9 This is a cross-sectional view of a battery cell according to a particular other embodiment of this disclosure.

[0074] Let's refer to each other. Figures 7 to 9 According to this embodiment, the battery cell 110 may have a venting section 110V. The venting section 110V is generally referred to as a component or mechanism provided in the battery cell 110 to allow the discharge of ventilation gases and the like inside the battery cell 110.

[0075] In one embodiment, the battery cell 110 according to this embodiment may be a cylindrical battery cell. Specifically, the battery cell 110 may include: an electrode assembly 10; a battery can 20 storing the electrode assembly 10 and having an open upper portion; and a cover assembly 30 connected to the open upper portion of the battery can 20. A gasket 50 may be inserted between the battery can 20 and the cover assembly 30. An exemplary structure of the battery cell 110 will be described below, but the battery cell of this disclosure is not limited to such a structure.

[0076] According to this embodiment, the battery canister 20 may be a cylindrical shell with an open upper portion, in which the electrode assembly 10 and electrolyte solution (not shown) can be stored in an internal storage space, and may include a metallic material such as aluminum (Al).

[0077] According to this embodiment, the cover assembly 30 may include a top cover 31 having a plate shape and a connecting plate 32 electrically and mechanically connected to the top cover 31. The top cover 31 may include a conductive metallic material and may cover the open upper part of the battery canister 20. The top cover 31 may be electrically connected to a first section 11, which is connected to a first electrode of the electrode assembly 10, and the top cover 31 may be electrically insulated from the battery canister 20 by a gasket 50. Therefore, the cover assembly 30 including the top cover 31 according to this embodiment can be used as a first electrode terminal 111, which is an external terminal of the first electrode included in the electrode assembly 10.

[0078] Specifically, in the electrical connection between the top cover 31 and the first segment 11, the battery cell 110 according to this embodiment may further include a first current collector 41 located on the upper part of the electrode assembly 10. The first current collector 41 may include a conductive metal material such as aluminum, copper, steel, nickel, etc., and may be electrically connected to the first segment 11 of the electrode assembly 10. The electrical connection may be performed by welding. A lead 60 may be connected to such a first current collector 41. The lead 60 may extend in the upper direction of the electrode assembly 10 and connect to the connecting plate 32. In certain other embodiments, the lead 60 may be directly connected to the lower surface of the top cover 31. The connection between the lead 60 and other components may be performed by welding. Furthermore, the first current collector 41 may be integrally formed with the lead 60. In this case, the lead 60 may have a long plate shape extending outward from near the center of the first current collector 41.

[0079] The first current collector 41 may have a plurality of protrusions and recesses (not shown) radially formed on its lower surface. With the radial protrusions and recesses, the first current collector 41 can be pressed to press-fit the protrusions and recesses into the curved first segment 11. The connection between the first current collector 41 and the first segment 11 can be performed, for example, by laser welding. Laser welding can be performed by partially melting the base material of the first current collector 41. In a variant embodiment, welding between the first current collector 41 and the first segment 11 can be performed with solder inserted. In this case, the solder may have a lower melting point than the first current collector 41 and the first segment 11. Laser welding can be replaced by resistance welding, ultrasonic welding, spot welding, etc.

[0080] Furthermore, the battery cell 110 according to this embodiment may also include a second current collector 42 located at the lower part of the electrode assembly 10. Specifically, the second current collector 42 may be located between the electrode assembly 10 and the bottom 20F of the battery canister 20. The second current collector 42 may include a conductive metal material such as aluminum, copper, steel, nickel, etc., and may be electrically connected to the second section 12 of the electrode assembly 10. One surface of the second current collector 42 may be connected to the second section 12, and the opposite surface of the second current collector 42 may be connected to the bottom 20F of the battery canister 20. Welding may be applied to the connection of the second current collector 42. Thus, the battery canister 20 according to this embodiment can be used as a second electrode terminal 112, which is an external terminal of the second electrode included in the electrode assembly 10.

[0081] Meanwhile, the secondary battery according to this embodiment may include an insulating plate 70. The insulating plate 70 may cover the first current collector 41. The insulating plate 70 covers the first current collector 41 on its upper surface, thereby preventing the first current collector 41 from contacting the battery canister 20 (particularly the beading part 20B of the battery canister 20 described below). The insulating plate 70 may also be provided with a separate lead hole, so that a lead 60 extending upward from the first current collector 41 can be pulled out. The lead 60 can be pulled out upward through the lead hole of the insulating plate 70 and connected to the lower surface of the connecting plate 32 or the lower surface of the top cover 31.

[0082] The peripheral edge region of the insulating plate 70 can be inserted between the first current collector plate 41 and the groove 20B of the battery canister 20, thereby fixing it to the connector between the electrode assembly 10 and the first current collector plate 41. Therefore, the connector between the electrode assembly 10 and the first current collector plate 41 can restrict its movement in the axial direction of the electrode assembly 10, thereby improving the assembly stability of the secondary battery. The insulating plate 70 can be made of a polymer resin with insulating properties. In one embodiment, the insulating plate 70 can comprise one or more materials selected from the group consisting of polyethylene, polypropylene, polyimide, and polybutylene terephthalate.

[0083] Meanwhile, the battery can 20 according to this embodiment may include a crimping portion 20C and a crimping groove portion 20B. The crimping portion 20C is part of the battery can 20 surrounding the cover assembly 30 and the gasket 50. Specifically, the battery can 20 and the cover assembly 30 can be crimped together with the gasket 50 inserted therebetween. That is, crimping can be applied to the connection between the battery can 20 and the cover assembly 30. Therefore, the crimping portion 20C can be formed in the battery can 20. More specifically, the gasket 50 is located between the battery can 20 and the cover assembly 30, and then the upper end of the battery can 20 is bent in the direction of the cover assembly 30, thereby achieving crimping.

[0084] The crimping portion 20B refers to a portion of the side surface of the battery can 20 that is recessed towards the center in the area above the electrode assembly 10, and is designed to stably position the cover assembly 30 and prevent the electrode assembly 10 from moving. In other words, according to this embodiment, the cover assembly 30 and the gasket 50 surrounding the cover assembly 30 can be positioned on the crimping portion 20B of the battery can 20. The aforementioned crimping connection can be performed with the cover assembly 30 and the surrounding gasket 50 positioned on the crimping portion 20B.

[0085] According to this embodiment, the gasket 50 is located between the battery canister 20 and the cover assembly 30, thus enhancing the sealing performance of the secondary battery. The gasket 50 may also include an electrically insulating material and can prevent short circuits between the battery canister 20, which serves as the second electrode terminal 112, and the cover assembly 30, which serves as the first electrode terminal 111. The gasket 50 may include at least one material selected from the group consisting of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and perfluoroalkoxyalkane (PFA).

[0086] According to this embodiment, the vent 110V can be formed on the lower surface of the battery cell 110. That is, it can be formed on the bottom 20F of the battery canister 20 (see...). Figure 9 )superior.

[0087] When a thermal event or thermal runaway occurs inside the battery cell 110, high-temperature venting gas or particles can be generated. The vent 110V is collectively referred to as a component or mechanism capable of discharging such high-temperature venting gas or particles. In one embodiment, a notch 110N may be formed on the lower surface of the battery cell 110, the notch 110N being relatively thinner than the region adjacent to the bottom of the battery. The notch 110N may have a constant peripheral edge. When the internal pressure of the battery cell 110 increases due to the high-temperature venting gas generated inside any battery cell 110, the notch 110N, being weak in rigidity due to its thin thickness, may rupture first. Due to the rupture of the notch 110N, the vent 110V opens, and the high-temperature venting gas or particles, etc., can be discharged through the vent 110V opened in this manner.

[0088] However, the structure of the vent 110V is merely an illustrative example, and the shape of the vent 110V is not particularly limited, as long as it is a component or mechanism capable of discharging internal ventilation gas in the event of a thermal event or thermal runaway.

[0089] Furthermore, although not specifically shown in the figures, the battery cell according to this disclosure can be a prismatic battery cell, wherein the electrode assembly is stored in a prismatic container. That is to say, although the battery cell according to this embodiment is depicted as a cylindrical battery cell in the figures, this is only an illustrative structure of the battery cell according to this disclosure, and the battery cell according to certain other embodiments of this disclosure can be a prismatic battery cell.

[0090] At the same time, refer to again Figures 1 to 3According to this embodiment, the battery pack frame 200 includes a bottom frame 210 and side frames 220 forming a storage space in which battery cells 110 are stored, as described above. The battery cells 110 can be placed on the bottom frame 210, and the side frames 220 can extend along the edges of the bottom frame 210. In one embodiment, the side frames 220 may include a first side frame 221, a second side frame 222, a third side frame 223, and a fourth side frame 224. The first side frame 221, the second side frame 222, the third side frame 223, and the fourth side frame 224 can be positioned along the four sides of the bottom frame 210, which has a square shape. The bottom frame 210 and the side frames 220 provide a storage space with an open upper portion, in which the battery cells 110 can be placed. After the battery cells 110 are placed in the storage space, the open upper portion of the storage space can be covered by a battery pack top cover 610. The battery pack cover 610 can be attached to the side frame 220 of the battery pack frame 200, and in one embodiment, welding or adhesive bonding can be used. The battery cells 110 can be sealed by the battery pack frame 200 and the battery pack cover 610. Furthermore, although not specifically shown in the figures, gaskets for improving sealing performance can be inserted between the battery pack cover 610 and the side frame 220.

[0091] Meanwhile, the battery pack 100 according to this embodiment may include a mounting part 220M1 and a mounting beam 220M2, which are disposed on the side frame 220 to fix the battery pack 100. In one embodiment, Figure 1 and Figure 2 The diagram shows a mounting portion 220M1 formed on the first side frame 221 and the second side frame 222, and a mounting beam 220M2 formed on the third side frame 223 and the fourth side frame 224. When the battery pack 100 is installed into the device, the mounting portion 220M1 and the mounting beam 220M2 can be used. In one embodiment, when the battery pack 100 is installed into a vehicle device, the mounting portion 220M1 and the mounting beam 220M2 can be fixed to the vehicle chassis.

[0092] Next, a detailed description will be provided of the immersion-cooled battery pack structure for preventing coolant leakage according to this embodiment.

[0093] Figure 10 This is a cross-sectional perspective view of a battery pack according to a specific embodiment of the present disclosure. Figure 11 It is shown Figure 10 A magnified cross-sectional view of part "B". Figure 12 It is shown Figure 11 A magnified cross-sectional view of part "C". Figure 13 It is shown Figure 11A magnified cross-sectional view of part of the "D". Figure 14 This is a perspective view showing a battery cell and a spacer according to a specific embodiment of the present disclosure. Figure 15 This is a partial enlarged perspective view showing a spacer according to a specific embodiment of the present disclosure.

[0094] Let's refer to each other. Figures 2 to 6 as well as Figures 10 to 15 According to this embodiment, the battery pack 100 includes: a spacer 300 located on the upper part of the bottom frame 210, and battery cells 110 disposed on the spacer 300; a retaining frame 400 located on the upper part of the spacer 300, and having holes 400H formed therein for the battery cells 110 to fit into; and a coolant CL flowing in the space between the spacer 300 and the retaining frame 400 to directly cool the battery cells 110 inside the battery pack frame 200, as described above. Figure 11 As shown, the coolant CL flowing in the space between the spacer 300 and the retaining frame 400 can directly cool the battery cell 110 while contacting the battery cell 110.

[0095] The side frame 220 may have an inlet port 910 and an outlet port 920. In one example, the inlet port 910 and the outlet port 920 are formed in the first side frame 221 in the following state: Figure 2 and Figure 3 As shown in the diagram, coolant CL flows in through inlet port 910, cooling the battery cell 110 while flowing along the space between spacer 300 and retaining frame 400, and then is discharged through outlet port 920. Inlet port 910 and outlet port 920 are connected to a coolant circulation system (not shown) outside the battery pack 100, allowing the coolant CL to circulate continuously.

[0096] The retaining frame 400 can be positioned between the spacer 300 and the battery pack cover 610. The retaining frame 400 has a hole 400H so that the battery cell 110 can fit into the hole 400H. Therefore, the hole 400H of the retaining frame 400 can have a shape corresponding to the external shape of the battery cell 110. If the battery cell 110 is a cylindrical battery, the hole 400H of the retaining frame 400 can be circular, and if the battery cell 110 is a prismatic battery, the hole 400H of the retaining frame 400 can be square.

[0097] The frame 400 can also include a 400P protrusion. For example... Figure 11As shown, the protrusion 400P of the retaining frame 400 can be hooked to the side frame 220 or the vertical beam 700 described below. Due to the hooking connection of the protrusion 400P, the retaining frame 400 can be mounted on the side frame 220 or the vertical beam 700, while being spaced a specific distance from the spacer 300. This specific distance between the retaining frame 400 and the spacer 300 ensures sufficient space for the coolant CL to flow through.

[0098] The spacer 300 can be placed on the base frame 210. The spacer 300 may have a mounting portion 310 on which the battery cell 110 can be mounted. The battery cell 110 is not directly located on the base frame 210, but can be placed on the base frame 210 with the battery cell 110 mounted on the mounting portion 310 of the spacer 300. For this purpose, the mounting portion 310 of the spacer 300 may have a shape corresponding to the external shape of the battery cell 110. If the battery cell 110 is a cylindrical battery, the mounting portion 310 of the spacer 300 may be circular, and if the battery cell 110 is a prismatic battery, the mounting portion 310 of the spacer 300 may be square. The battery cell 110 is located in the mounting portion 310 of the spacer 300, so that the battery cell 110 can be stably placed and fixed in the space inside the battery pack frame 200.

[0099] As described above, the spacer 300 and the retaining frame 400 define the space in which the coolant CL flows and prevent the coolant CL from leaking into other spaces. The spacer 300 corresponds to the lower limit of coolant flow, and the retaining frame 400 corresponds to the upper limit of coolant flow. By preventing coolant leakage in this way, the safety and cooling performance of the battery pack 100 can be improved.

[0100] Specifically, in the area above the retaining frame 400, the busbar 130 guiding the electrical connections of the battery cells 110 can be connected to the electrode terminals 111 and 112 of the battery cells 110. As described above, the cover assembly 30 and the battery canister 20 of the battery cells 110 can serve as the first electrode terminal 111 and the second electrode terminal 112 of the battery cells 110. The busbar 130 is connected to the first electrode terminal 111 or the second electrode terminal 112, thereby enabling HV connections, which are electrical connections of the battery cells 110. An HV connection is a connection used as a power source to supply power requiring high voltage, and refers to an electrical connection between battery cells or an electrical connection between a battery pack and a device. That is, the electrical connection between the battery cells 110 can be made in the upper region of the retaining frame 400. In other words, the space for coolant CL to flow and the space for HV connections to make electrical connections between the battery cells 110 can be separated from each other by the retaining frame 400. As will be described later, the coolant CL can be insulating oil or cooling water. When the coolant CL, acting as cooling water, comes into contact with the HV connection portion, a short circuit may occur, potentially leading to serious safety issues. Furthermore, even if the coolant CL is an insulating oil, it may negatively impact the electrical connection between the battery cells 110 when it comes into contact with the portion where the electrical connection between the battery cells 110 is made. Therefore, in this embodiment, by separating the flow of the coolant CL into the space of the retaining frame 400 from the space where the electrical connection between the battery cells 110 is made, the impact of the coolant CL on the electrical connection of the battery cells 110 can be minimized, while maintaining the effect of improving cooling performance through direct cooling by the coolant CL.

[0101] In the battery pack 100 according to this embodiment, a first waterproof adhesive 500a can be applied to the upper part of the retaining frame 400. Since the first waterproof adhesive 500a is applied to the upper part of the retaining frame 400, it is possible to prevent coolant CL from leaking through the retaining frame 400 into the upper region of the retaining frame 400. With the battery cell 110 installed into the hole 400H of the retaining frame 400, the first waterproof adhesive 500a can be applied to the upper surface of the retaining frame 400 and the upper region of the battery cell 110.

[0102] As previously described, the battery pack 100 may include an open upper battery pack cover 610 covering the battery pack frame 200, wherein a first waterproof adhesive 500a may be applied to the space between the retaining frame 400 and the battery pack cover 610. Specifically, at least some of the busbars 130 may be surrounded by the first waterproof adhesive 500a. Furthermore, the peripheral space of the busbars 130 may be filled with the first waterproof adhesive 500a. Additionally, the space between the retaining frame 400 and the battery pack cover 610 may be filled with the first waterproof adhesive 500a. Due to the retaining frame 400 and the first waterproof adhesive 500a, coolant CL leakage into the upper region of the retaining frame 400 can be prevented.

[0103] Figure 16 This is a cross-sectional perspective view of a battery pack frame according to a specific embodiment of the present disclosure. Figure 17 It is shown Figure 16 A magnified cross-sectional view of part of the "E". Figure 18 It is shown Figure 17 A magnified cross-sectional view of part of the "F".

[0104] Let's refer to each other. Figure 11 , Figure 12 and Figures 14 to 18 In the battery pack 100 according to this embodiment, a second waterproof adhesive 500b can be applied to the surface of the spacer 300 facing the battery cell 110. Specifically, the second waterproof adhesive 500b can be applied to the mounting portion 310 of the spacer 300. Due to the spacer 300 and the second waterproof adhesive 500b, coolant CL can be prevented from passing through the spacer 300 and leaking into the lower region of the spacer 300.

[0105] The first waterproof adhesive 500a and the second waterproof adhesive 500b according to this embodiment are not particularly limited in terms of materials, as long as they exhibit waterproof performance and have impact resistance, adhesion, electrical insulation properties, etc. In one embodiment, the first waterproof adhesive 500a and the second waterproof adhesive 500b may include a 2-liquid epoxy material, wherein a curing agent is mixed into the main agent.

[0106] Meanwhile, the coolant CL according to this embodiment can be a fluid. In the battery pack 100, the coolant CL is in direct contact with the battery cells 110, making the coolant CL electrically insulating. The coolant CL can be a material with insulating properties. In one embodiment, the coolant CL can be insulating oil. However, in the case of the battery pack 100 according to this embodiment, since the coolant CL is prevented from leaking into areas outside the space between the spacer 300 and the retaining frame 400, ordinary cooling water can also be used as the coolant CL.

[0107] Figure 19 This is a partial cross-sectional view of a battery pack according to a particular other embodiment of the present disclosure.

[0108] refer to Figure 19 As previously described, the first waterproof adhesive 500a can be applied to the space between the retaining frame 400 and the battery pack cover 610. In a battery pack 100 according to a particular other embodiment of the present disclosure, a foam member 611 can be disposed on the lower surface of the battery pack cover 610. The foam member 611 can be a member in the form of expanded foam and can be attached to the lower surface of the battery pack cover 610. The space between the retaining frame 400 and the foam member 611 can be filled with the first waterproof adhesive 500a.

[0109] High-temperature venting gases and particles inside the battery cell 110 can be discharged from the vent 110V of the battery cell 110, and such high-temperature venting gases and particles can be discharged to the outside of the battery pack 100 through the venting channel VC of the bottom frame 210 described below. In order to prevent the venting gases or particles from being discharged in the direction of the battery pack cover 610 rather than in the direction of the venting channel VC of the bottom frame 210, a foam member 611 can be attached to the lower surface of the battery pack cover 610. That is, the foam member 611 can be a member used for top sealing.

[0110] Figure 20 This is a perspective view showing the state of removing the first side frame in the battery pack frame according to a specific embodiment of the present disclosure. Figure 21 This is an exploded perspective view of the base frame according to a specific embodiment of the present disclosure.

[0111] refer to Figure 20 and Figure 21 as well as Figure 3 , Figure 5 , Figure 6 , Figure 12 , Figure 16 , Figure 17 , Figure 18 The battery pack frame 200 includes a bottom frame 210 and side frames 220 as described above. According to a specific embodiment of this disclosure, a venting channel VC may be formed in the bottom frame 210. Specifically, the bottom frame 210 may include a first frame 211 and a second frame 212 located below the first frame 211, and the venting channel VC may be formed between the first frame 211 and the second frame 212. The detailed structure of the bottom frame 210 and the venting channel VC will be described later.

[0112] In the battery pack 100 according to this embodiment, a vertical beam 700 dividing the battery cells 110 into multiple battery cell groups 110G can be located on a base frame 210. The vertical beam 700 can be located upright on the base frame 210, such that one surface of the vertical beam 700 is perpendicular to one surface of the base frame 210. In one embodiment, Figures 2 to 6 Three vertical beams 700 are shown positioned at specific intervals on the base frame 210. Thus, the battery cell 110 can be divided into four battery cell groups 110G.

[0113] Meanwhile, the battery pack 100 according to this embodiment may include a separation frame 800 positioned adjacent to the side frame 220. In one embodiment, the separation frame 800 may be positioned adjacent to the second side frame 222. The separation frame 800 may be located between the second side frame 222 and the battery cell 110, and may be placed on the bottom frame 210. A venting space VS may be formed between the separation frame 800 and the second side frame 222, and the venting space VS is a space in which venting gas emitted from the battery cell 110 is discharged. The separation frame 800 and the venting space VS will be described later.

[0114] According to this embodiment, the side frame 220, vertical beam 700, and separation frame 800 can be metal frames having empty spaces within them. Specifically, the side frame 220, vertical beam 700, and separation frame 800 can be metal frames in the form of square tubes with cavities. This reduces the weight of the battery pack 100 while ensuring its rigidity. Furthermore, since the bottom frame 210, side frame 220, vertical beam 700, and separation frame 800 are made of metallic material, welding can be used for connections between the frames. The welding method is not particularly limited; however, for example, MIG welding (metal inert gas welding) or FSW (friction stir welding) can be applied.

[0115] Additionally, the battery pack 100 according to this embodiment may also include a lower battery pack cover 620 covering the lower part of the bottom frame 210. The lower battery pack cover 620 may be a plate-shaped member comprising a metallic material.

[0116] Next, the connection line between the battery pack lower cover 620 and the bottom frame 210 will be described.

[0117] Figure 22 This is a plan view showing a battery cell and the welding lines around it according to a specific embodiment of the present disclosure. Figure 23 This is a plan view showing a battery cell and a battery pack cover according to a specific embodiment of the present disclosure.

[0118] Let's refer to each other. Figure 11 , Figure 17 , Figures 20 to 23When viewed along the height direction, the bonding line BL between the battery pack lower cover 620 and the bottom frame 210 can be formed along the outer periphery of the area where the battery cell 110 is located. Here, viewing along the height direction refers to viewing on one surface of the bottom frame 210 in a direction perpendicular to that surface. More specifically, viewing along the height direction can correspond to viewing along the -z axis in the xy plane, such as... Figure 22 and Figure 23 As shown.

[0119] The joint line BL between the battery pack lower cover 620 and the bottom frame 210 can be the part where welding is performed. Specifically, the part where the battery pack lower cover 620 and the bottom frame 210 are welded can be the part where the side frame 220, vertical beam 700, and separation frame 800 are placed. In other words, the side frame 220, bottom frame 210, and battery pack lower cover 620 can be joined together by welding. Furthermore, the vertical beam 700, bottom frame 210, and battery pack lower cover 620 can be joined together by welding. Additionally, the separation frame 800, bottom frame 210, and battery pack lower cover 620 can be joined together by welding. Figure 22 In this context, the bonding line BL around the outer periphery of the battery cell 110 can be the part where the side frame 220, bottom frame 210, and battery pack lower cover 620 are joined together. Furthermore, Figure 22 The bonding line BL located between the battery cells 110G can be the part where the vertical beam 700, the bottom frame 210, and the battery pack lower cover 620 are joined together. Furthermore, Figure 22 The bonding line BL located directly above each battery cell 110G can be the part where the separation frame 800, bottom frame 210 and battery pack bottom cover 620 are joined together.

[0120] Meanwhile, the battery pack lower cover 620 according to this embodiment may include an upwardly recessed portion 620D. This recessed portion 620D may be a portion that is recessed upwards to engage with the vertical beam 700. When the recessed portion 620D of the battery pack lower cover 620 is engaged with the bottom frame 210 and the vertical beam 700, a bonding line BL can be formed at the corresponding portion.

[0121] As described above, the bonding line BL formed along the outer periphery of the area where the battery cell 110 is located, between the battery pack lower cover 620 and the bottom frame 210, can be a part where the side frames 220 are joined together. This bonding line BL not only secures the space between the side frames 220, the bottom frame 210, and the battery pack lower cover 620, but also performs a leak-proof function to prevent coolant CL from leaking to the outside of the battery pack 100. Specifically, in the downward direction of the battery cell 110, the aforementioned spacer 300 and the second waterproof adhesive 500b perform the primary function of preventing coolant leakage. The bonding line BL formed along the outer periphery of the area where the battery cell 110 is located performs a secondary function of preventing coolant leakage in the downward direction of the battery cell 110. That is, even if the coolant CL penetrates and leaks through the spacer 300 and the second waterproof adhesive 500b, the coolant CL is sealed by the bonding line BL and does not leak to the outside. Similarly, the bonding line BL located between battery cell groups 110G or directly above the battery cell groups 110G can also perform the function of preventing coolant CL from leaking to the outside.

[0122] Simultaneously, the welding joint between the battery pack lower cover 620 and the bottom frame 210 can be performed in only one direction on one surface of the battery pack lower cover 620. This is because the side frame 220, vertical beam 700, or separation frame 800 are placed on opposite sides. In this way, when welding is performed in only one direction on one surface of the battery pack lower cover 620, the FSW (friction stir welding) method is preferably applied.

[0123] Next, the directional ventilation structure of the battery pack 100 according to this embodiment will be described.

[0124] Refer again Figure 8 , Figure 12 , Figure 14 , Figure 15 and Figure 18According to this embodiment, the vent portion 110V of the battery cell 110 can face the spacer 300. More specifically, the vent portion 110V of the battery cell 110 can face the mounting portion 310 of the spacer 300. According to this embodiment, the spacer 300 may include a spacer vent portion 320a and an outer peripheral portion 320b, the spacer vent portion 320a being the portion facing the vent portion 110V, and the outer peripheral portion 320b surrounding the spacer vent portion 320a. The spacer vent portion 320a may have a thickness less than that of the outer peripheral portion 320b, or may have a notch. Due to a thermal event or thermal runaway of the battery cell 110, high-temperature venting gas and particles are discharged from the vent portion 110V of the battery cell 110, and due to the pressure of the venting gas, the spacer vent portion 320a may separate from the outer peripheral portion 320b, and the spacer vent portion 320a may open. In other words, high-temperature ventilated gas and particles can be discharged downwards through the vent 110V and the open spacer vent 320a. Subsequently, the high-temperature ventilated gas and particles can move along a preset path through the venting channel VC provided in the bottom frame 210. The specific structure of the bottom frame 210 and the venting channel VC will be described below.

[0125] Figure 24 This is a partial perspective view showing a partial appearance of the base frame according to a specific embodiment of the present disclosure. Figure 25 It shows from Figure 24 A partial perspective view of the state where the bottom frame of the first frame is removed. Figure 26 It shows from Figure 25 A partial perspective view of the state where the bottom frame has been removed and the frame has been separated. Figure 27 This is a plan view showing a partial appearance of the base frame according to a specific embodiment of the present disclosure. Figure 28 It shows from Figure 27 A plan view showing the state of the bottom frame after the first frame has been removed.

[0126] refer to Figures 24 to 28 as well as Figure 11 , Figure 12 , Figure 17 , Figure 18 and Figure 21 According to a specific embodiment of the present disclosure, the bottom frame 210 may be formed with a ventilation channel VC, which guides high-temperature ventilation gas and particles discharged from the ventilation section 110V of the battery cell 110. Specifically, the bottom frame 210 may include a first frame 211 and a second frame 212 located below the first frame 211, and the ventilation channel VC may be formed between the first frame 211 and the second frame 212.

[0127] The first frame 211 may have through holes 211H. When viewed along the height direction, the through holes 211H may be positioned to at least partially overlap with the vents 110V of the battery cell 110. The through holes 211H may be configured to correspond one-to-one with the vents 110V. Similarly, the through holes 211H may be configured to correspond one-to-one with the vents 320a of the spacer.

[0128] High-temperature venting gas and particles passing through the vent 110V and the open spacer vent 320a can flow into the venting channel VC inside the bottom frame 210 through the through hole 211H. The high-temperature venting gas and particles flowing into the venting channel VC are discharged to the outside of the battery pack 100. The battery pack 100 according to this embodiment has a so-called "bottom venting" structure, which uses the bottom frame 210 to discharge high-temperature venting gas and particles to the outside. The HV connection mentioned above is used as a power source to supply electricity that requires high voltage, and means the connection between battery cells, etc. If high-temperature venting gas or particles caused by a thermal event of the battery cell 110 come into contact with a high-voltage path such as the HV connection, a short circuit or arc discharge may occur, which may lead to additional explosions and flames. On the other hand, the battery pack 100 according to this embodiment has the "bottom venting" structure as described above, so that high-temperature venting gas or particles caused by a thermal event are discharged downwards, that is, discharged to the bottom frame 210. Therefore, there is no risk of high-temperature venting gas or particles coming into contact with high-pressure paths (such as HV connections), and ultimately, safety against thermal runaway is enhanced.

[0129] Furthermore, in this embodiment, since the retaining frame 400 also covers the area where the electrode terminals 111 and 112 of the battery cell 110 and the busbar 130 are located, it can completely prevent high-temperature ventilation gas or particles from reaching the area where the electrode terminals 111 and 112 of the battery cell 110 and the busbar 130 are located.

[0130] Furthermore, since the battery pack 100 according to this embodiment has a "bottom venting" structure, the effect of high-temperature venting gas or particles on the coolant CL flowing in the space between the spacer 300 and the retaining frame 400 can be minimized.

[0131] In addition, the spacer 300 and the second waterproof adhesive 500b can prevent coolant CL from leaking into the lower area of ​​the spacer 300, and can also prevent high-temperature ventilation gas or particles from leaking in the upward direction rather than in the downward direction where the bottom frame 210 is located.

[0132] Simultaneously, as described above, the vertical beam 700 can divide the battery cell 110 into multiple battery cell groups 110G. The ventilation channel VC corresponding to one battery cell group 110G can have an independent ventilation flow path that is not shared with the ventilation channel VC corresponding to another battery cell group 110G. In one embodiment, such as... Figure 14 and Figure 21 As shown, four second frames 212 can be provided corresponding to each of the four battery cell packs 110G. The venting channel VC in one second frame 212 can have an independent venting path that is not connected to the venting channel VC in another second frame 212.

[0133] In addition, the second frame 212 may have at least one partition wall 212W, and may be divided into multiple ventilation channels VC within the second frame 212 due to the partition wall 212W.

[0134] In this way, some ventilation channels VC can not share space with each other and can have independent ventilation paths. Therefore, high-temperature ventilation gas and particles passing through one ventilation channel VC will not propagate to other ventilation channels VC. This minimizes the propagation of thermal events occurring in a specific battery cell 110 to other battery cells 110. Thus, high-temperature ventilation gas or particles will not flow back to other battery cells 110 connected to other ventilation channels VC, and ultimately, thermal events will not propagate to or trigger other battery cells 110. In this embodiment, by implementing unique ventilation paths between ventilation channels VC, the transmission of thermal runaway between battery cells 110 is minimized, and battery pack explosions and structural collapses can be prevented.

[0135] Meanwhile, the ventilation channel VC according to this embodiment can communicate with the ventilation device 220D disposed in the side frame 220. High-temperature ventilation gas and particles flowing along the ventilation channel VC can be discharged to the outside of the battery pack 100 through the ventilation device 220D. The specific form of the ventilation device 220D is not particularly limited, and the ventilation device 220D can be a valve structure that opens or ruptures when the internal pressure is equal to or higher than a certain level. Figure 26 Four ventilation devices 220D formed in the second side frame 222 are shown.

[0136] Next, an exemplary structure of the ventilation path from the ventilation channel VC to the ventilation device 220D will be described.

[0137] As described above, the battery pack 100 according to this embodiment may include a separation frame 800 positioned adjacent to the side frame 220. The separation frame 800 may be upright on the bottom frame 210 such that one surface of the separation frame 800 is perpendicular to one surface of the bottom frame 210. One surface of the separation frame 800 may be perpendicular to one surface of the vertical beam 700. The separation frame 800 may be located between the second side frame 222 and the battery cell 110, and a ventilation space VS may be formed between the separation frame 800 and the second side frame 222. This ventilation space VS may communicate with a ventilation device 220D.

[0138] like Figure 21 and Figure 27 As shown, the first frame 211 of the bottom frame 210 can be formed with not only a through hole 211H but also an opening 211P. Such an opening 211P can communicate with the ventilation space VS. When viewed along the height direction, the through hole 211H and the opening 211P can be located on opposite sides relative to the separation frame 800. In other words, the area forming the through hole 211H and the area forming the opening 211P can be separated from each other by the separation frame 800.

[0139] refer to Figure 24 and Figure 25 High-temperature venting gas or particles emitted from the venting section of the battery cell can flow into the venting channel VC disposed between the first frame 211 and the second frame 212 through the through hole 211H of the first frame 211. The high-temperature venting gas or particles flow along the direction in which the venting channel VC extends.

[0140] refer to Figures 25 to 28 High-temperature ventilation gas or particles flowing along the ventilation channel VC can flow into the ventilation space VS through the opening 211P of the first frame 211. Even within such a ventilation space VS, the space can be divided by the battery cell group 110G and can not be shared with each other. Finally, the high-temperature ventilation gas or particles flowing into the ventilation space VS can be discharged to the outside of the battery pack 100 through the ventilation device 220D.

[0141] In this embodiment, a long ventilation path is provided along the ventilation channel VC, and a separate ventilation space VS can also be provided in addition to the ventilation channel VC. High-temperature ventilation gas and particles move along the long ventilation path, and the ventilation path bends through the ventilation space VS. While the ventilation gas flows along the ventilation channel VC and the ventilation space VS, the temperature of the ventilation gas or particles can decrease. Therefore, it is possible to prevent the ventilation gas or particles from triggering an explosion. Furthermore, as the ventilation path becomes longer, it is possible to prevent oxygen flowing in from outside the battery pack 100 from encountering the ventilation gas, thereby preventing an explosion. In addition, large particles can be filtered out in the corresponding ventilation path.

[0142] In the above embodiments, expressions indicating directions such as "front," "back," "left," "right," "up," and "down" have been used. These expressions are for ease of description only and may vary, for example, depending on the position of the target object or the observer.

[0143] The battery pack described above according to specific embodiments of this disclosure can be applied to various devices, including, for example, transport vehicles such as electric bicycles, electric vehicles, and hybrid vehicles, as well as energy storage systems (ESS). However, it is not limited thereto; the battery pack can be applied to various devices that use secondary batteries.

[0144] While the present disclosure has been shown and described above with reference to preferred embodiments, the scope of the present disclosure is not limited to the embodiments, but also includes various modifications and variations made by those skilled in the art using the concepts defined in the appended claims.

[0145] [Explanation of reference numerals in the attached figures]

[0146] 100: Battery pack

[0147] 110: Battery cell

[0148] 110V: Ventilation section

[0149] 200: Battery pack frame

[0150] 210: Base frame

[0151] 220: Side frame

[0152] 300: Spacer

[0153] 400: Maintain the frame

[0154] 500a: First waterproof adhesive

[0155] 500b: Second waterproof adhesive

[0156] 610: Battery pack top cover

[0157] 620: Battery pack bottom cover

Claims

1. A battery pack, comprising: Multiple battery cells; A battery pack frame, comprising a bottom frame and side frames, wherein the bottom frame and the side frames form a storage space, and the individual battery cells are stored in the storage space; A spacer is located on the upper part of the bottom frame, and the battery cell is mounted on the spacer; A retaining frame is located on the upper part of the spacer and has a hole formed therein, in which the battery cell is fitted. as well as A coolant flows in the space between the spacer and the retaining frame to directly cool the individual battery cells inside the battery pack frame.

2. The battery pack according to claim 1, in, A first waterproof adhesive is applied to the upper part of the retaining frame.

3. The battery pack according to claim 1, in, In the region above the retaining frame, a busbar guiding the electrical connection between the battery cells is connected to the electrode terminals of the battery cells.

4. The battery pack according to claim 3, in, At least a portion of the busbar is surrounded by the first waterproof adhesive.

5. The battery pack according to claim 1, It also includes a battery pack cover that covers the open upper part of the battery pack frame. in, The first waterproof adhesive is applied to the space between the retaining frame and the battery pack cover.

6. The battery pack according to claim 5, in, Foam components are disposed on the lower surface of the battery pack cover.

7. The battery pack according to claim 1, in, A second waterproof adhesive is applied to the surface of the spacer facing the battery cell.

8. The battery pack according to claim 1, It also includes a battery pack lower cover that covers the lower part of the base frame. in, When viewed along the height direction, the joint line between the lower cover of the battery pack and the bottom frame is formed along the outer periphery of the area where the battery cell is located.

9. The battery pack according to claim 1, in, The battery cell has a venting section.

10. The battery pack according to claim 9, in, The vent of the battery cell faces the spacer.

11. The battery pack according to claim 10, in, The spacer includes: a spacer vent, the spacer vent being a portion facing the vent; and an outer peripheral portion surrounding the spacer vent. The venting portion of the spacer has a thickness thinner than the outer periphery or has a notch.

12. The battery pack according to claim 9, in, The bottom frame has a ventilation channel that guides the ventilation gas or particles emitted from the ventilation section of the battery cell.

13. The battery pack according to claim 12, in, The bottom frame includes a first frame and a second frame located below the first frame, and The ventilation channel is formed between the first frame and the second frame.

14. The battery pack according to claim 13, in, A through-hole is formed in the first frame, and When viewed along the height direction, the through hole is positioned to at least partially overlap with the vent of the battery cell.

15. The battery pack according to claim 12, in, A vertical beam is located on the bottom frame, and the vertical beam divides the battery cell into multiple battery cell groups.

16. The battery pack according to claim 15, in, The ventilation channel corresponding to one battery cell group has an independent ventilation flow path that is not shared with the ventilation channels corresponding to other battery cell groups.

17. The battery pack according to claim 12, in, The ventilation channel is connected to the ventilation device installed in the side frame.

18. An apparatus comprising a battery pack according to claim 1.

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