Battery pack and vehicle containing the 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 based on 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, and all the contents disclosed in the specifications and drawings of the applications are incorporated herein.

[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 rechargeable battery cells and a vehicle including such a battery pack.

Background Art

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

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

[0005] Thus, because the battery cells or battery modules contained within a battery pack are densely packed into a small space to increase energy density, they need to be properly managed to prevent overheating and thermal runaway.

[0006] However, conventional technology, when manufacturing battery packs, involves housing multiple battery cells or multiple battery modules in a box-shaped pack tray with an opening at the top, and closing the opening of the pack tray with a simple plate-structured lid. As a result, heat generated inside the battery pack accumulates inside the battery pack, causing overheating or thermal runaway of the battery cells or battery modules.

[0007] Furthermore, such conventional technologies have a problem in that the battery pack lid is directly exposed to the high-temperature gases and flames generated when the battery cells and battery modules housed in the battery pack experience thermal runaway. As a result, the heat accumulated in the exposed lid rapidly causes thermal transfer, leading to a chain reaction of thermal runaway in other battery cells and other battery modules, and even causing the battery pack to ignite or explode. [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] The technical problem that this invention aims to solve is to provide a battery pack and a vehicle including it that prevent overheating and thermal runaway of batteries housed in the battery pack, and suppress or delay chain-reaction thermal runaway between batteries and ignition of the battery pack. [Means for solving the problem]

[0009] A battery pack according to one aspect of the present invention includes a plurality of batteries, a pack tray having an internal space for housing the plurality of batteries and an opening communicating with the internal space, a pack lid configured to be coupled 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 that makes thermal contact with at least one of the plurality of batteries, and a second contact portion that makes thermal contact with the pack lid at a predetermined distance from the first contact portion.

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

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

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

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

[0014] In one embodiment, the plurality of first contact portions of the heat dissipation structure may be arranged in a grid pattern with intervals between them on a first plane, and the plurality of second contact portions of the heat dissipation structure may be arranged in a grid pattern with intervals between them on a second plane parallel to the first plane.

[0015] In one embodiment, the plurality of first contact portions and the plurality of second contact portions may be arranged alternately with respect 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 integrally connect a plurality of first contact portions and a plurality of second contact portions.

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

[0018] In one embodiment, each of the multiple batteries may include a plurality of rechargeable and dischargeable battery cells, and a battery case having the contact surface on which the vent portion is provided, and housing the plurality of battery cells inside.

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

[0020] In one embodiment, the pack tray includes a wall forming the internal space, the wall may include at least one gas inlet communicating with the space between the first contact portion and the second contact portion and configured to allow gas generated by a battery housed 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 one embodiment of any of the embodiments described above. [Effects of the Invention]

[0022] According to the present invention, a heat dissipation structure is located between a plurality of batteries housed in a pack tray and a pack lid, and by discharging the heat generated by the plurality of batteries, overheating and thermal runaway of the batteries housed in the battery pack can be prevented, chain thermal runaway between batteries and ignition of the battery pack can be suppressed or delayed, and the safety of the battery pack can be improved.

[0023] Further, 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 contacts the pack lid at a predetermined distance from such a first contact portion, and has a relatively larger surface area than a simple plate structure, so that the cooling rate of the battery can be increased and the heat dissipation efficiency can be improved.

[0024] In addition, since the heat dissipation structure is configured by a geometric three-dimensional structure that provides a gas discharge space between the battery and the pack lid, the discharge path of gas and flame generated by the battery can be easily designed.

[0025] Furthermore, those having ordinary knowledge in the technical field to which the present invention pertains will clearly understand from the following description that various embodiments according to the present invention can solve various technical problems not described above.

Brief Description of the Drawings

[0026] [Figure 1] It is an exploded perspective view showing a battery pack according to an embodiment of the present invention. [Figure 2] It is a view showing the heat dissipation structure of the battery pack shown in FIG. 1. [Figure 3] It is a cross-sectional view of the heat dissipation structure shown in FIG. 2. [Figure 4] It is a view showing the heat dissipation structure of the battery pack shown in FIG. 1. [Figure 5] It is a cross-sectional view taken along the line S1 - S1' of FIG. 1. [Figure 6]This figure shows a battery included in a battery pack according to one embodiment of the present invention. [Figure 7] This is an enlarged view of area A1 in Figure 6. [Figure 8] This is a cross-sectional view along the S2-S2' line in Figure 7. [Figure 9] This figure shows the open state of the vent section shown in Figure 8. [Figure 10] This figure shows a vehicle according to one embodiment of the present invention. [Modes for carrying out the invention]

[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to clarify the solutions to the technical problems of the present invention. However, in describing the present invention, if a description of related prior art obscures the gist of the present invention, such description may be omitted. Furthermore, the terms used herein are defined in consideration of the function of the present invention, and these may change depending on the intention or convention of the designer, manufacturer, etc. Therefore, terms described later should be defined based on the content throughout this specification.

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

[0029] As shown in Figure 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 comprised of a battery module. As will be described later, when the battery 110 is embodied in a battery module, the battery 110 may include a plurality of battery cells that serve as the basic units for charging and discharging, and a battery case that houses such a plurality of battery cells.

[0031] In one embodiment, the battery 110 can also be embodied in a pouch-type, cylindrical, or rectangular battery cell. In this case, the battery 110 can be manufactured by housing an electrode assembly in which a positive electrode and a negative electrode are stacked with a separator in between, and an electrolyte material, in a pouch-type, cylindrical, or rectangular 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 have an internal space for accommodating one or more batteries 110 and an opening that communicates with this internal space. For example, the pack tray 120 may be configured in a box shape with an opening at its upper end, and a plurality of batteries 110 can be accommodated in its internal space.

[0033] In one embodiment, the pack tray 120 may include a wall 122 that forms the internal space. One surface of the wall 122 adjacent to the internal space may be provided with at least one gas inlet 124 into which gas generated by the battery 110 flows. In addition, at least one gas passage communicating with at least one of the gas inlets 124 may be provided inside the wall 122. In this case, the outer surface of the pack tray 120 may be provided with a gas outlet 126 for discharging gas that has moved through the gas passage to the outside.

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

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

[0036] The pack lid 130 is configured to connect with the pack tray 120 described above to cover the upper opening of the pack tray 120. Such a pack lid 130 can be attached to the pack tray 120 using fastening members such as screws, or by various methods such as welding or adhesive bonding.

[0037] The heat dissipation structure 140 is positioned between the multiple batteries 110 and the pack lid 130 and is configured to dissipate the heat generated by the multiple batteries 110. For this purpose, the heat dissipation structure 140 may be made of a metal material with 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 including aluminum.

[0038] Furthermore, the heat dissipation structure 140 may be configured to make thermal contact with the battery 110 and the pack lid 130, respectively, and to quickly disperse and release the heat generated by the battery 110 across the entire pack lid 130.

[0039] In one embodiment, the heat dissipation structure 140 is configured in the shape of a plate or sheet and can be bonded to the bottom surface of the pack lid 130. In this case, the pack lid 130 can have a multilayer structure in which the heat dissipation structure is integrally bonded to its bottom surface.

[0040] In other embodiments, the heat dissipation structure 140 may be composed of a geometric three-dimensional structure.

[0041] Figure 2 shows the heat dissipation structure 140 of the battery pack shown in Figure 1.

[0042] As shown in Figure 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 make thermal contact with at least one of the multiple batteries 110 housed in the pack tray 120. For this purpose, the first contact portion 142 may have a plate structure.

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

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

[0046] In one embodiment, the heat dissipation structure 140 may include multiple first contact portions 142 and second contact portions 144 as described above.

[0047] For example, the multiple first contact portions 142 may be spaced apart from each other and each may be configured to make thermal contact with at least one battery 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 multiple second contact portions 144 may be spaced apart from each other and configured to make thermal contact with different parts of the pack lid 130. In this case, the multiple second contact portions 144 may be arranged in a grid pattern at intervals from each other on a virtual second plane parallel to the first plane.

[0049] These multiple first contact portions 142 and multiple second contact portions 144 can be arranged alternately with respect to a first direction (for example, the X-axis direction or the Y-axis direction) parallel to the first plane or the second plane.

[0050] Figure 3 shows a cross-sectional view of the heat dissipation structure 140 shown in Figure 2.

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

[0052] The multiple first contact portions 142 may be arranged 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 the contact surface of the battery 110 that each first contact portion 142 contacts.

[0053] The multiple second contact portions 144 may be arranged 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 the plane corresponding to the bottom surface of the pack lid 130 that each second contact portion 144 contacts.

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

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

[0056] Figure 4 shows the heat dissipation structure of the battery pack shown in Figure 1.

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

[0058] Such a heat dissipation structure 140 can quickly disperse and cool the heat generated from the battery housed in the pack tray 120 across the entire pack lid 130, preventing heat from accumulating in any part of the pack lid 130. Furthermore, the heat generated in the battery 110 is cooled as it is transferred through the first contact portion 142, connecting leg 146, and 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 and cascading thermal runaway between batteries can be suppressed or delayed, and the battery pack can be prevented from catching fire.

[0059] Figure 5 shows a cross-sectional view along the S1-S1' line in Figure 1.

[0060] As shown in Figure 5, the heat dissipation structure 140 is positioned between the upper end surface of the battery 110 housed in the pack tray 120 and the pack lid 130 covering the 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 be discharged by moving through the space provided between the first contact portion 142 and the second contact portion 144 of the heat dissipation structure 140.

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

[0062] In other words, the gas inlet 124 can 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 can 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 122.

[0063] Furthermore, the wall 122 may be provided with a gas passage 124a located inside it, which communicates with the gas inlet 124. The vent gas VG that flows in through the gas inlet 124 can move through the gas passage 124a and be discharged to the outside through a gas outlet 126 provided on the outer surface of the pack tray 120.

[0064] In this way, by positioning the heat dissipation structure 140, which has a geometric three-dimensional structure, between the battery 110 and the pack lid 130 to provide a gas exhaust path, it is possible to easily design an exhaust path for gases and flames generated in the battery pack.

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

[0066] As shown in Figure 6, the battery 110 may have a contact surface F1 that contacts at least one of the multiple first contact portions 142 of the heat dissipation structure 140 described above. In addition, a vent portion 114 for discharging gas may be provided in the portion of the contact surface F1 other than the portion that contacts the first contact portion 142.

[0067] Such a battery 110 can be realized as a battery module that includes a plurality of battery cells, which are the basic units of charging and discharging, and a battery case 112 that houses these 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 house a plurality of the battery cells inside. Terminals T1 and T2 that are electrically connected to the battery cells housed in its internal space may be arranged on the outer surface of such a battery case 112.

[0069] Figure 7 shows an enlarged view of area A1 in Figure 6.

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

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

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

[0073] Such a vent portion 114 can be provided by forming a cut or incision line in the contact surface F1 of the battery 110.

[0074] Figure 8 shows a cross-sectional view along the S2-S2' line in Figure 7.

[0075] As shown in Figure 8, the battery case 112 may have a multilayer 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 the main body of the battery case 112 and may be provided with a vent hole VH on one side corresponding to the contact surface F1.

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

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

[0079] Figure 9 shows the vent section 114 shown in Figure 8 in its open state.

[0080] As shown in Figure 9, when gas is generated inside the battery 110, the cover portion 114a of the vent portion 114 is separated from the rest of the vent hole cover 112b by the pressure of the gas, allowing the vent hole VH of the case frame 112a to open.

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

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

[0083] In this way, the vent hole cover 112b, equipped with the vent section 114, covers the vent hole VH of the case frame 112a, preventing foreign matter from penetrating into the battery module and allowing gas generated inside the battery 110 to be quickly discharged to the outside of the battery 110. As a result, the thermal energy accumulated inside the battery 110 can be minimized, delaying the heat propagation time and preventing chain reaction thermal runaway and ignition of other batteries housed in the battery pack 100.

[0084] In one embodiment, the vent hole cover 112b may be made of a flexible sheet of material and be configured to surround at least two of the multiple surfaces of the case frame 112a and 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 detaching from the case frame 112a due to the gas pressure of the battery 110.

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

[0086] As shown in Figure 10, a vehicle 10 according to one 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 can provide the electrical energy necessary for various operations of the vehicle 10.

[0087] For reference, the battery pack 100 according to the present invention can be applied not only to various electrical devices and systems other than vehicles, but also to Energy Storage Systems (ESS).

[0088] As described above, according to the present invention, the heat dissipation structure is located between the multiple batteries housed in the pack tray and the pack lid, and by releasing the heat generated by the multiple batteries, it is possible to prevent overheating and thermal runaway of the batteries housed in the battery pack, suppress or delay chain reaction thermal runaway between batteries and ignition of the battery pack, thereby improving the safety of the battery pack.

[0089] Furthermore, since 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 contacts the pack lid at a predetermined distance from the first contact portion, and has a relatively larger surface area than a simple plate structure, it can increase the cooling rate of the battery and improve the heat dissipation efficiency.

[0090] Furthermore, since the heat dissipation structure is composed of a geometric three-dimensional structure that provides a gas exhaust space between the battery and the pack lid, the exhaust path for gases and flames generated by the battery can be easily designed.

[0091] Furthermore, it goes without saying that embodiments of the present invention can solve a variety of other technical problems beyond those referred to herein, not only in the art in question but also in related art fields.

[0092] The present invention has been described above with reference to specific embodiments. However, those skilled in the art will clearly understand that various modified embodiments are possible within the technical scope of the present invention. Therefore, the embodiments disclosed above should be considered in an explanatory rather than restrictive manner. That is, the true technical scope of the present invention is shown in the claims, and all differences within the equivalent scope 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 section 114a Lid 114b Support part 120 Pack Tray 122 Wall 124 Gas Inlet 124a Gas passage 126 Gas outlet 128 Crossbeam 130 pack lid 140 Heat dissipation structure 142 1st contact part 144 Second contact part 146 Linked Legs F1 contact surface P1 1st plane P2 2nd plane Terminal 1 Terminal 2 VG vent gas VH Bent Hall

Claims

1. Multiple batteries, A pack tray having an internal space for housing multiple batteries, and an opening communicating with the internal space, A pack lid configured to be attached to the pack tray and cover the opening, Includes a heat dissipation structure disposed between a plurality of the batteries and the pack lid, The heat dissipation structure is A first contact portion that makes thermal contact with at least one of the multiple batteries, It includes a second contact portion that is separated by a predetermined distance from the first contact portion and is in thermal contact with the pack lid, A battery pack in which a space is formed between the first contact portion and the second contact portion, which are separated by a predetermined distance from each other, to provide a vent gas discharge path.

2. Multiple batteries, A pack tray having an internal space for housing multiple batteries, and an opening communicating with the internal space, A pack lid configured to be attached to the pack tray and cover the opening, Includes a heat dissipation structure disposed between a plurality of the batteries and the pack lid, The heat dissipation structure is A first contact portion that makes thermal contact with at least one of the multiple batteries, It includes a second contact portion that is separated by a predetermined distance from the first contact portion and is in thermal contact with the pack lid, The heat dissipation structure further includes at least one connecting leg configured to maintain a distance between the first and second contact portions, with one end connected to the first contact portion and the other end connected to the second contact portion.

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

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

5. The battery pack according to claim 3, wherein the plurality of second contact portions of the heat dissipation structure are spaced apart from each other and each is configured to make thermal contact with different portions of the pack lid.

6. The plurality of first contact portions of the heat dissipation structure are arranged regularly in the vertical and horizontal directions with spacing between them on the first plane. The battery pack according to claim 3, wherein the plurality of second contact portions of the heat dissipation structure are arranged regularly in a vertical and horizontal direction with spacing between them on a second plane parallel to the first plane.

7. The battery pack according to claim 6, wherein the plurality of first contact portions and the plurality of second contact portions are arranged alternately 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 integrally connect a plurality of first contact portions and a plurality of second contact portions.

9. Multiple batteries, A pack tray having an internal space for housing multiple batteries, and an opening communicating with the internal space, A pack lid configured to be attached to the pack tray and cover the opening, Includes a heat dissipation structure disposed between a plurality of the batteries and the pack lid, The heat dissipation structure is A first contact portion that makes thermal contact with at least one of the multiple batteries, It includes a second contact portion that is separated by a predetermined distance from the first contact portion and is in thermal contact with the pack lid, The heat dissipation structure includes a plurality of first contact portions and a plurality of second contact portions, A battery pack in which 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 the portion of the contact surface other than the portion that contacts at least one of the first contact portions.

10. Each of the aforementioned batteries is Multiple rechargeable battery cells, The battery pack according to claim 9, comprising a battery case having the contact surface on which the vent portion is provided, and housing a plurality of the battery cells inside.

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

12. Multiple batteries, A pack tray having an internal space for housing multiple batteries, and an opening communicating with the internal space, A pack lid configured to be attached to the pack tray and cover the opening, Includes a heat dissipation structure disposed between a plurality of the batteries and the pack lid, The heat dissipation structure is A first contact portion that makes thermal contact with at least one of the multiple batteries, It includes a second contact portion that is separated by a predetermined distance from the first contact portion and is in thermal contact with the pack lid, The pack tray includes the wall that forms the internal space, The aforementioned wall body, At least one gas inlet is configured to communicate with the space between the first contact portion and the second contact portion, and for gas generated by the battery housed in the internal space to flow into, A battery pack comprising at least one gas passage communicating with at least one of the gas inlets.

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

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