Battery pack and vehicle including same

Abstract

A battery pack according to one embodiment of the present invention includes a plurality of batteries, a pack tray having an internal space for accommodating the plurality of batteries and an opening communicating with the internal space, a pack lid configured to couple to the pack tray and cover the opening, and a heat dissipation structure disposed between the plurality of batteries and the pack lid, wherein the heat dissipation structure includes a first contact portion in thermal contact with at least one of the plurality of batteries, and a second contact portion in thermal contact with the pack lid, spaced a predetermined distance from the first contact portion.

Description

[Technical field]

[0001] This application claims priority to Korean Patent Application No. 10-2022-0183585 filed on December 23, 2022, and Korean Patent Application No. 10-2023-0041543 filed on March 29, 2023, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings.

[0002] The present invention relates to a battery pack and a vehicle including the same, and more particularly to a battery pack including a plurality of chargeable and dischargeable battery cells, and a vehicle including such a battery pack. [Background technology]

[0003] Generally, a secondary battery refers to a battery that can be repeatedly charged and discharged, such as a lithium-ion battery, lithium polymer battery, nickel-cadmium battery, nickel-metal hydride battery, nickel-zinc battery, etc. The most basic battery cell can provide an output voltage of about 2.5V to 4.2V.

[0004] Recently, as such secondary batteries are applied to devices requiring a high output voltage and a large charging capacity, such as electric vehicles and energy storage systems (ESS), battery modules configured by connecting a plurality of battery cells in series, parallel, or a combination of series and parallel, and battery packs configured by connecting battery modules in series, parallel, or a combination of series and parallel, have been widely used.

[0005] As such, the battery cells or battery modules contained within the battery pack are densely arranged in a small space to increase energy density, and therefore need to be properly managed to prevent overheating or thermal runaway.

[0006] However, in the conventional technology, when manufacturing a battery pack, a plurality of battery cells or a plurality of battery modules are accommodated in a box-shaped pack tray with an opening at the top end, and the opening of the pack tray is closed with a lid having a simple plate structure. This causes a problem that heat generated inside the battery pack accumulates directly inside the battery pack, causing overheating or thermal runaway of the battery cells or battery modules.

[0007] In addition, in such conventional technologies, the lid of the battery pack is directly exposed to high-temperature gas and flames that are generated when a battery cell or battery module contained in the battery pack experiences thermal runaway. This causes a problem in that heat transfer progresses rapidly due to the heat accumulated in the exposed lid, causing a chain reaction of thermal runaway in other battery cells and other battery modules, and even causing the battery pack to ignite or explode. Summary of the Invention [Problem to be solved by the invention]

[0008] The technical problem to be solved by the present invention is to provide a battery pack and a vehicle including the same, which prevent overheating or thermal runaway of batteries contained in the battery pack and suppress or delay chain thermal runaway between batteries and ignition of the battery pack. [Means for solving the problem]

[0009] A battery pack according to one embodiment of the present invention includes a plurality of batteries, a pack tray having an internal space for accommodating the plurality of batteries and an opening communicating with the internal space, a pack lid configured to couple to the pack tray and cover the opening, and a heat dissipation structure disposed between the plurality of batteries and the pack lid, wherein the heat dissipation structure includes a first contact portion in thermal contact with at least one of the plurality of batteries, and a second contact portion in thermal contact with the pack lid, spaced a predetermined distance from the first contact portion.

[0010] In one embodiment, the heat dissipation structure may further include at least one connecting leg having one end connected to the first contact portion and the other end connected to the second contact portion, and configured to maintain a gap between the first contact portion and the second contact portion.

[0011] In an embodiment, the heat dissipation structure may include a plurality of the first contact portions and a plurality of the second contact portions.

[0012] In one embodiment, the plurality of first contact portions of the heat dissipation structure may be spaced apart from one another and configured to each be in thermal contact with at least one battery of the plurality of batteries.

[0013] In one embodiment, the second contact portions of the heat dissipation structure may be configured to be spaced apart from one another and to be in thermal contact with different portions of the pack lid.

[0014] In one embodiment, the multiple first contact portions of the heat dissipation structure may be arranged in a grid pattern spaced apart from each other on a first plane, and the multiple second contact portions of the heat dissipation structure may be arranged in a grid pattern spaced apart from each other on a second plane parallel to the first plane.

[0015] In one embodiment, the first contact portions and the second contact portions may be arranged alternately with each other with reference to a first direction parallel to the first plane or the second plane.

[0016] In one embodiment, the heat dissipation structure may include a plurality of connecting legs that connect the plurality of first contact portions and the plurality of second contact portions together.

[0017] In one embodiment, each of the multiple batteries has a contact surface that contacts at least one first contact portion among the multiple first contact portions of the heat dissipation structure, and a vent portion for discharging gas may be provided in a portion of the contact surface other than the portion that contacts the at least one first contact portion.

[0018] In one embodiment, each of the plurality of batteries may include a plurality of chargeable and dischargeable battery cells, and a battery case having the contact surface with the vent portion and housing the plurality of battery cells therein.

[0019] In one embodiment, the heat dissipation structure may be constructed from a material having a higher thermal conductivity than the pack lid.

[0020] In one embodiment, the pack tray includes a wall defining the internal space, the wall including at least one gas inlet communicating with a space between the first contact portion and the second contact portion and configured to allow gas generated in a battery contained in the internal space to flow in, and at least one gas passage communicating with the at least one gas inlet.

[0021] A vehicle according to another aspect of the present invention includes a battery pack according to any one of the above-described embodiments. Effect of the Invention

[0022] According to the present invention, a heat dissipation structure is positioned between a plurality of batteries housed in a pack tray and the pack lid, and dissipates heat generated by the plurality of batteries, thereby preventing overheating and thermal runaway of the batteries housed in the battery pack, and suppressing or delaying chain reaction thermal runaway between the batteries and ignition of the battery pack, thereby improving the safety of the battery pack.

[0023] In addition, the heat dissipation structure includes a first contact portion that contacts at least one of the plurality of batteries, and a second contact portion that is spaced a predetermined distance from the first contact portion and contacts the pack lid, and has a relatively larger surface area than a simple plate structure, thereby increasing the cooling rate of the battery and improving heat dissipation efficiency.

[0024] In addition, since the heat dissipation structure is configured with a geometric three-dimensional structure that provides a gas exhaust space between the battery and the pack lid, it is easy to design an exhaust path for gas and flames generated in the battery.

[0025] Furthermore, a person having ordinary skill in the art to which the present invention pertains will clearly understand from the following description that various embodiments of the present invention can solve various technical problems not described above. [Brief description of the drawings]

[0026] [Figure 1] 1 is an exploded perspective view showing a battery pack according to an embodiment of the present invention; [Diagram 2] 2 is a diagram showing a heat dissipation structure of the battery pack shown in FIG. 1. [Diagram 3] 3 is a cross-sectional view of the heat dissipation structure shown in FIG. 2. [Figure 4] 2 is a diagram showing a heat dissipation structure of the battery pack shown in FIG. 1; [Diagram 5] 2 is a cross-sectional view taken along the line S1-S1' in FIG. [Figure 6]FIG. 2 is a diagram showing a battery included in a battery pack according to an embodiment of the present invention. [Figure 7] FIG. 7 is an enlarged view showing region A1 in FIG. [Figure 8] 8 is a cross-sectional view taken along the line S2-S2' in FIG. 7. [Figure 9] FIG. 9 is a diagram showing the vent portion shown in FIG. 8 in an open state. [Figure 10] 1 is a diagram showing a vehicle according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, in order to clarify the solution to the technical problem of the present invention, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, if a description of related known technology makes the gist of the present invention unclear, the description of such technology may be omitted. Furthermore, the terms used in this specification are defined in consideration of the functions of the present invention, and may vary depending on the intentions or practices of designers, manufacturers, etc. Therefore, the terms described below should be defined based on the contents of this specification as a whole.

[0028] FIG. 1 shows an exploded perspective view of a battery pack 100 according to one embodiment of the present invention.

[0029] As shown in FIG. 1, a battery pack 100 according to one embodiment of the present invention includes a battery 110, a pack tray 120, a pack lid 130, and a heat dissipation structure 140.

[0030] The battery 110 may be configured as a battery module. When the battery 110 is embodied as a battery module, which will be described later, the battery 110 may include a plurality of battery cells that are basic units for charging and discharging, and a battery case that accommodates the plurality of battery cells.

[0031] In an embodiment, the battery 110 may be implemented as a pouch-type, cylindrical, or prismatic battery cell. In this case, the battery 110 may be manufactured by placing an electrode assembly, in which a positive electrode and a negative electrode are stacked with a separator therebetween, and an electrolyte material in a pouch-type, cylindrical, or prismatic case, and sealing the case.

[0032] The pack tray 120 is configured to accommodate one or more batteries 110. To this end, the pack tray 120 may include an internal space for accommodating one or more batteries 110, and an opening communicating with the internal space. For example, the pack tray 120 may be configured in a box shape having an opening at an upper end, and may accommodate a plurality of batteries 110 in the internal space.

[0033] In one embodiment, the pack tray 120 may include a wall 122 that defines the internal space. At least one gas inlet 124 through which gas generated in the battery 110 flows may be provided on one surface of the wall 122 adjacent to the internal space. In addition, at least one gas passage communicating with the at least one gas inlet 124 may be provided inside the wall 122. In this case, a gas outlet 126 through which gas that has moved through the gas passage is discharged to the outside may be provided on an outer surface of the pack tray 120.

[0034] The pack tray 120 may further include a cross beam 128 that divides the internal space into a plurality of storage chambers that are independent of each other. In this case, each storage chamber may accommodate at least one battery 110. The gas inlet 124 may be provided for each storage chamber.

[0035] In one embodiment, the pack tray 120 may further accommodate various electrical components (not shown) that control the charging and discharging operation of the battery 110 accommodated in its internal space or monitor the SOC (State Of Charge), SOH (State Of Health), etc.

[0036] The pack lid 130 is configured to be coupled to the above-mentioned pack tray 120 to cover the upper opening of the pack tray 120. The pack lid 130 may be coupled to the pack tray 120 using various methods, such as a fastening member such as a screw, welding, or adhesive.

[0037] The heat dissipation structure 140 is disposed between the plurality of batteries 110 and the pack lid 130, and is configured to dissipate heat generated in the plurality of batteries 110. For this purpose, the heat dissipation structure 140 may be made of a metal material having high thermal conductivity. In particular, the heat dissipation structure 140 may be made of a material having higher thermal conductivity than the pack lid 130. For example, the pack lid 130 may be made of stainless steel, and the heat dissipation structure 140 may be made of a material containing aluminum.

[0038] In addition, the heat dissipation structure 140 may be configured to be in thermal contact with the battery 110 and the pack lid 130, respectively, and to rapidly disperse and release heat generated in the battery 110 throughout the pack lid 130.

[0039] In one embodiment, the heat dissipation structure 140 may be configured in a plate or sheet shape and coupled to the bottom surface of the pack lid 130. In this case, the pack lid 130 may have a multi-layer structure in which the heat dissipation structure is integrally coupled to the bottom surface thereof.

[0040] In other embodiments, the heat dissipation structure 140 may be configured in a geometric configuration.

[0041] FIG. 2 shows a heat dissipation structure 140 of the battery pack shown in FIG.

[0042] As shown in FIG. 2, the heat dissipation structure 140 may include a first contact portion 142 and a second contact portion 144 .

[0043] The first contact portion 142 may be configured to be in thermal contact with at least one of the plurality of batteries 110 housed in the pack tray 120. To this end, the first contact portion 142 may have a plate structure.

[0044] The second contact portion 144 may be configured to be spaced a predetermined distance from the first contact portion 142, have a step between the second contact portion 144 and the first contact portion 142, and to be in thermal contact with the pack lid 130. To this end, the second contact portion 144 may have a plate structure.

[0045] The heat dissipation structure 140 may further include at least one connecting leg 146. The connecting leg 146 may have one end connected to the first contact portion 142 and the other end connected to the second contact portion 144, and may be configured to maintain a distance between the first contact portion 142 and the second contact portion 144.

[0046] In an embodiment, the heat dissipation structure 140 may include a plurality of the first contact portions 142 and the second contact portions 144.

[0047] For example, the multiple first contact portions 142 may be configured to be spaced apart from each other and to be in thermal contact with at least one of the multiple batteries 110. In this case, the multiple first contact portions 142 may be arranged in a grid pattern spaced apart from each other on a virtual first plane.

[0048] Furthermore, the second contact portions 144 may be configured to be spaced apart from one another and to be in thermal contact with different portions of the pack lid 130. In this case, the second contact portions 144 may be arranged in a lattice pattern at intervals on a virtual second plane parallel to the first plane.

[0049] The plurality of first contact portions 142 and the plurality of second contact portions 144 may be arranged alternately with respect to a first direction (eg, the X-axis direction or the Y-axis direction) parallel to the first plane or the second plane.

[0050] FIG. 3 shows a cross-sectional view of the heat dissipation structure 140 shown in FIG.

[0051] As shown in FIG. 3, the heat dissipation structure 140 may include a plurality of first contact portions 142 and a plurality of second contact portions 144 .

[0052] The first contact portions 142 may be disposed at positions spaced apart from each other on a virtual first plane P1. In this case, the first plane P1 may be a plane corresponding to a contact surface of the battery 110 with which each of the first contact portions 142 comes into contact.

[0053] The second contact portions 144 may be disposed at positions spaced apart from each other on a virtual second plane P2 parallel to the first plane P1. In this case, the second plane P2 may be a plane corresponding to the bottom surface of the pack lid 130 with which each of the second contact portions 144 comes into contact.

[0054] The plurality of first contact portions 142 and the plurality of second contact portions 144 may be arranged alternately with respect to a first direction (eg, the Y-axis direction) parallel to the first plane P1 or the second plane P2.

[0055] In addition, the heat dissipation structure 140 may include a plurality of connecting legs 146 that connect the plurality of first contact portions 142 and the plurality of second contact portions 144 together.

[0056] FIG. 4 shows a heat dissipation structure of the battery pack shown in FIG.

[0057] As shown in FIG. 4 , the heat dissipation structure 140 may be disposed between the upper end surface of the battery 110 accommodated in the pack tray 120 and a pack lid 130 that covers the opening of the pack tray 120 .

[0058] Such a heat dissipation structure 140 can quickly disperse and cool heat generated from the batteries accommodated in the pack tray 120 throughout the pack lid 130, thereby preventing heat from accumulating in a portion of the pack lid 130. In addition, heat generated in the battery 110 is cooled while being transferred through the first contact portion 142, the connecting leg 146, and the second contact portion 144 of the heat dissipation structure 140, thereby improving the cooling performance of the battery pack 100. As a result, thermal runaway of the battery or chain reaction thermal runaway between the batteries can be suppressed or delayed, and ignition of the battery pack can be prevented.

[0059] FIG. 5 shows a cross-sectional view taken along line S1-S1' in FIG.

[0060] 5, the heat dissipation structure 140 is disposed between an upper end surface of the battery 110 accommodated in the pack tray 120 and a pack lid 130 covering an opening of the pack tray 120, and can provide a discharge path for the vent gas VG generated in the battery 110. That is, the vent gas VG generated in the battery 110 can move through a space provided between a first contact portion 142 and a second contact portion 144 of the heat dissipation structure 140 and be discharged.

[0061] To this end, the wall 122 of the pack tray 120 may have at least one gas inlet 124 provided on one surface of the wall 122 adjacent to the internal space of the pack tray 120, in a portion located between the first contact portion 142 and the second contact portion 144 of the heat dissipation structure 140.

[0062] That is, the gas inlet 124 may be configured to communicate with the space between the first contact portion 142 and the second contact portion 144 of the heat dissipation structure 140. Therefore, the vent gas VG generated in the battery 110 may move through the space between the first contact portion 142 and the second contact portion 144 of the heat dissipation structure 140 and flow into the gas inlet 124 of the wall body 122.

[0063] The wall body 122 may have a gas passage 124a provided therein and communicating with the gas inlet 124. The vent gas VG flowing in through the gas inlet 124 moves through the gas passage 124a and can be discharged to the outside through a gas exhaust port 126 provided on the outer surface of the pack tray 120.

[0064] In this way, the heat dissipation structure 140 having a geometric three-dimensional structure is disposed between the battery 110 and the pack lid 130 to provide a gas exhaust path, making it easy to design an exhaust path for gases and flames generated in the battery pack.

[0065] FIG. 6 shows a battery 110 included in a battery pack according to one embodiment of the present invention.

[0066] 6, the battery 110 may have a contact surface F1 that contacts at least one of the first contact portions 142 of the heat dissipation structure 140. A vent portion 114 that exhausts gas may be provided on a portion of the contact surface F1 other than the portion that contacts the first contact portion 142.

[0067] The battery 110 may be realized as a battery module including a plurality of battery cells, which are basic units for charging and discharging, and a battery case 112 that houses the plurality of battery cells.

[0068] In this case, the battery case 112 may have a contact surface F1 on which the vent portion 114 is provided, and may be configured to accommodate a plurality of the battery cells therein. Terminals T1 and T2 may be arranged on an outer surface of the battery case 112, and may be electrically connected to the battery cells accommodated in the inner space thereof.

[0069] FIG. 7 shows an enlarged view of region A1 of FIG.

[0070] 7, at least one vent portion 114 may be provided on the contact surface F1 of the battery case 112. The vent portion 114 may include a cover portion 114a and at least one support portion 114b.

[0071] The cover 114a may be configured to separate from the remainder of the contact surface F1 when the internal pressure of the battery 110 rises above a predetermined pressure. When the cover 114a is separated from the contact surface F1, an opening communicating with the interior space of the battery case 112 may be formed in the contact surface F1.

[0072] The support portion 114b may be configured such that one end thereof is integrally connected to the other portion of the contact surface F1 excluding the lid portion 114a, and the other end thereof is integrally connected to the lid portion 114a. Such a support portion 114b may support the lid portion 114a so that the lid portion 114a separated from the contact surface F1 maintains a constant position.

[0073] Such vents 114 may be provided by forming cuts or slits in the contact surface F1 of the battery 110.

[0074] FIG. 8 shows a cross-sectional view taken along the line S2-S2' in FIG.

[0075] 8, the battery case 112 may have a multi-layer structure, that is, the battery case 112 may include a case frame 112a and a vent hole cover 112b.

[0076] The case frame 112a constitutes a main body of the battery case 112 and may have a vent hole VH provided on one surface corresponding to the contact surface F1.

[0077] The vent hole cover 112b may be attached to an outer surface of the case frame 112a and configured to cover the vent hole VH. In this case, the above-mentioned vent portion 114 may be provided in the vent hole cover 112b.

[0078] For example, in a steady state where no gas is generated inside the battery 110, the cover 114a of the vent portion 114 covers and closes the opening of the vent hole VH of the case frame 112a. For this purpose, the cover 114a of the vent portion 114 may have an area equal to or larger than the opening area of ​​the vent hole VH.

[0079] FIG. 9 shows the vent portion 114 shown in FIG. 8 in an open state.

[0080] As shown in FIG. 9, when gas is generated inside the battery 110, the cover portion 114a of the vent portion 114 can be separated from the remaining portion of the vent hole cover 112b by the pressure of the gas, thereby opening the vent hole VH of the case frame 112a.

[0081] In this case, the support portion 114b of the vent portion 114 supports the lid portion 114a separated from the vent hole cover 112b, and can maintain the lid portion 114a in a fixed position.

[0082] For reference, if the cover 114a is completely separated from the vent hole cover 112b due to the pressure of the vent gas, pieces of the separated cover 114a may cause various problems inside the battery pack. To prevent such problems, the support 114b may support the cover 114a so that the cover 114a is not completely separated from the vent hole cover 112b.

[0083] In this manner, the vent hole cover 112b having the vent portion 114 covers the vent hole VH of the case frame 112a, thereby preventing foreign matter from penetrating into the battery module and quickly discharging gas generated inside the battery 110 to the outside of the battery 110. As a result, the thermal energy accumulated inside the battery 110 can be minimized to delay the heat propagation time, and the chain reaction of thermal runaway and fire of other batteries accommodated in the battery pack 100 can be prevented.

[0084] In one embodiment, the vent hole cover 112b may be configured as a sheet of a flexible material, surrounding at least two of the surfaces of the case frame 112a, and configured to be attached to the case frame 112a. As a result, the weight of the battery 110 can be reduced and the manufacturing process can be simplified, while preventing the entire vent hole cover 112b from coming off the case frame 112a due to the gas pressure of the battery 110.

[0085] FIG. 10 shows a vehicle 10 according to one embodiment of the present invention.

[0086] 10, a vehicle 10 according to an embodiment of the present invention may include a battery pack 100 according to the various embodiments described above. In this case, the battery pack 100 may provide electrical energy required for various operations of the vehicle 10.

[0087] For reference, the battery pack 100 according to the present invention can be applied to various electric devices and electric systems other than vehicles, and can also be applied to an ESS (Energy Storage System).

[0088] As described above, according to the present invention, the heat dissipation structure is positioned between the multiple batteries housed in the pack tray and the pack lid, and dissipates heat generated by the multiple batteries, thereby preventing overheating and thermal runaway of the batteries housed in the battery pack, and suppressing or delaying chain reaction thermal runaway between the batteries and ignition of the battery pack, thereby improving the safety of the battery pack.

[0089] In addition, the heat dissipation structure includes a first contact portion that contacts at least one of the plurality of batteries, and a second contact portion that is spaced a predetermined distance from the first contact portion and contacts the pack lid, and has a relatively larger surface area than a simple plate structure, thereby increasing the cooling rate of the battery and improving heat dissipation efficiency.

[0090] In addition, since the heat dissipation structure is configured with a geometric three-dimensional structure that provides a gas exhaust space between the battery and the pack lid, it is easy to design an exhaust path for gas and flames generated in the battery.

[0091] Furthermore, it goes without saying that the embodiments according to the present invention can solve various other technical problems in the art as well as in related arts other than those mentioned in this specification.

[0092] The present invention has been described above with reference to specific embodiments. However, it will be clear to those skilled in the art that various modified embodiments are possible within the technical scope of the present invention. Therefore, the above disclosed embodiments should be considered from an explanatory perspective, not a limiting one. That is, the true scope of the technical idea of ​​the present invention is set forth in the claims, and all differences within the scope of the equivalents thereof should be interpreted as being included in the present invention. [Explanation of symbols]

[0093] 10 Vehicles 100 Battery Packs 110 Battery 112 Battery case 112a Case frame 112b Vent hole cover 114 Vent 114a Lid 114b Support part 120 Pack Tray 122 Wall 124 Gas inlet 124a Gas passage 126 Gas exhaust port 128 Crossbeam 130 pack lids 140 Heat dissipation structure 142 1st contact part 144 Second contact part 146 Connected Legs F1 contact surface P1 1st plane P2 2nd plane T1 Terminal T2 Terminal VG Vent Gas VH Vent Hole

Claims

1. Multiple batteries and a pack tray having an internal space for accommodating a plurality of the batteries and an opening communicating with the internal space; a pack lid configured to mate with the pack tray and cover the opening; a heat dissipation structure disposed between the plurality of batteries and the pack lid; The heat dissipation structure includes: a first contact portion in thermal contact with at least one battery of the plurality of batteries; a second contact portion spaced a predetermined distance from the first contact portion and in thermal contact with the pack lid.

2. 2. The battery pack of claim 1, wherein the heat dissipation structure further includes at least one connecting leg having one end connected to the first contact portion and another end connected to the second contact portion, the connecting leg being configured to maintain a gap between the first contact portion and the second contact portion.

3. The battery pack according to claim 1 , wherein the heat dissipation structure includes a plurality of the first contact portions and a plurality of the second contact portions.

4. 4. The battery pack of claim 3, wherein the first contact portions of the heat dissipation structure are spaced apart from one another and each are configured to be in thermal contact with at least one battery of the plurality of batteries.

5. The battery pack according to claim 3 , wherein the second contact portions of the heat dissipation structure are spaced apart from one another and configured to be in thermal contact with different portions of the pack lid, respectively.

6. the first contact portions of the heat dissipation structure are arranged in a lattice pattern at intervals on a first plane, The battery pack according to claim 3 , wherein the second contact portions of the heat dissipation structure are arranged in a lattice pattern spaced apart from one another on a second plane parallel to the first plane.

7. The battery pack according to claim 6 , wherein the first contact portions and the second contact portions are alternately arranged with respect to a first direction parallel to the first plane or the second plane.

8. The battery pack according to claim 3 , wherein the heat dissipation structure includes a plurality of connecting legs that connect the plurality of first contact portions and the plurality of second contact portions together.

9. 4. The battery pack of claim 3, wherein each of the plurality of batteries has a contact surface that contacts at least one of the plurality of first contact portions of the heat dissipation structure, and a vent portion for discharging gas is provided in a portion of the contact surface other than the portion that contacts the at least one first contact portion.

10. Each of the plurality of batteries comprises: A plurality of chargeable and dischargeable battery cells; The battery pack according to claim 9 , further comprising: a battery case having the contact surface on which the vent portion is provided and housing a plurality of the battery cells therein.

11. The battery pack according to claim 1 , wherein the heat dissipation structure is made of a material having a higher thermal conductivity than the pack lid.

12. The pack tray includes a wall defining the internal space, The wall body is At least one gas inlet communicating with a space between the first contact portion and the second contact portion and configured to receive gas generated in a battery housed in the internal space; at least one gas passage in communication with the at least one gas inlet.

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

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