Battery pack

Abstract

Provided is a battery pack capable of reducing heat transfer to cells adjacent thereto when an event occurs in a certain battery cell and capable of preventing or substantially preventing sagging of a case. A battery pack includes: a plurality of battery cells including venting members, each of the venting members being located in a surface of a respective one of the plurality of battery cells; a cover member configured to cover the plurality of battery cells; and a cooling plate located in a region in which the battery cells are located and in contact with the cover member. The cooling plate includes an exhaust protruding portion positioned corresponding to the exhaust member and protruding in a direction opposite to the cover member.

Description

[0001] Cross - reference to related applications

[0002] This application claims the priority and benefit of Korean Patent Application No. 10 - 2023 - 0095340, filed on July 21, 2023, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical field

[0003] Aspects of embodiments of the present disclosure relate to a battery pack that can reduce heat transfer to adjacent cells when a predetermined event occurs in a certain cell and can prevent or substantially prevent sagging of the housing. Background art

[0004] Unlike non - rechargeable primary batteries, secondary batteries are rechargeable and dischargeable batteries. A low - capacity secondary battery in which a single cell is encapsulated in a group can be used for portable small electronic devices such as mobile phones and cameras, and a high - capacity secondary battery in which, for example, dozens of cells are connected to each other in a battery pack is widely used as a power source for driving motors in hybrid vehicles and the like.

[0005] A secondary battery may be configured such that an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator between the positive electrode plate and the negative electrode plate, and an electrolyte are accommodated in a housing, and a cover plate is mounted on the housing. Representative examples of the electrode assembly may include a wound electrode assembly and a stacked electrode assembly. In such an electrode assembly, electrode tabs may protrude in an upward or lateral direction, and a current collector may be connected to the electrode tabs.

[0006] Secondary batteries have recently been applied to high - output products such as electric vehicles and energy storage systems (ESS). To generate the output required for these products, secondary batteries may be applied to products in the form of a battery pack composed of multiple cells.

[0007] The information disclosed in this section is provided only to enhance the understanding of the background art of the present disclosure, and thus it may include information that does not constitute related art. Summary of the utility model

[0008] According to aspects of embodiments of the present disclosure, there is provided a battery pack that can reduce heat transfer to adjacent cells when an event occurs in a certain cell and can prevent or substantially prevent sagging of the housing.

[0009] According to one or more embodiments of the present disclosure, a battery pack includes: a plurality of battery cells, including exhaust members, each of the exhaust members being located in the surface of a corresponding one of the plurality of battery cells; a cover member configured to cover the plurality of battery cells; and a cooling plate located in the region where the battery cells are located and in contact with the cover member, wherein the cooling plate includes exhaust protrusions corresponding in position to the exhaust members and protruding in a direction opposite to the cover member.

[0010] In one or more embodiments, the exhaust protrusions may have a height of 1 mm to 2 mm.

[0011] In one or more embodiments, the exhaust protrusions may be formed to have a shape corresponding to the outer periphery of the exhaust members.

[0012] In one or more embodiments, the cooling plate may include holes at positions corresponding to the positions of the exhaust members, and each of the exhaust protrusions may protrude along the outer periphery of a corresponding one of the holes.

[0013] In one or more embodiments, the cooling plate may further include a flange portion configured to surround at least one region around the exhaust protrusions.

[0014] In one or more embodiments, the flange portion may surround the exhaust protrusions along three sides.

[0015] In one or more embodiments, the flange portion may expose the exhaust protrusions in at least one direction.

[0016] In one or more embodiments, the flange portion may protrude higher than the exhaust protrusions.

[0017] In one or more embodiments, the flange portion may protrude 1 mm to 2 mm higher than the exhaust protrusions.

[0018] In one or more embodiments, the battery pack may further include a housing configured to surround the cover member and the cooling plate.

[0019] In one or more embodiments, the cover member may include an opening at a position corresponding to the position of the exhaust member.

[0020] In one or more embodiments, the battery pack may further include a heat insulating member between the plurality of battery cells and the cover member.

[0021] In one or more embodiments, the heat insulating member may include mica sheets.

[0022] In one or more embodiments, each of the plurality of battery cells may further include a terminal located on its side portion where there is no cooling plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings incorporated in this specification illustrate some embodiments, and the accompanying drawings are used to further illustrate the technical idea of the present disclosure in combination with the specific description of the following embodiments, and the present disclosure should not be construed as being limited to the content shown in such drawings. In the drawings:

[0024] Figure 1 is a perspective view showing a state in which a cover in a battery pack according to an embodiment is coupled to a battery cell;

[0025] Figure 2 is an exploded perspective view showing a state in which a cover in a battery pack according to an embodiment is separated from a battery cell;

[0026] Figure 3 is an exploded perspective view showing a state in which a cooling plate in a battery pack according to an embodiment is separated from a battery cell;

[0027] Figure 4 is a partially enlarged view showing a state in which a cooling plate in a battery pack according to an embodiment is coupled to a battery cell;

[0028] Figure 5 is a rear perspective view of a cooling plate in a battery pack according to an embodiment; and

[0029] Figure 6 is a partial perspective view of a cooling plate in a battery pack according to an embodiment. DETAILED DESCRIPTION

[0030] Herein, some example embodiments will be described in further detail with reference to the accompanying drawings.

[0031] Some embodiments are provided to more comprehensively illustrate the present disclosure to those of ordinary skill in the art; however, the following embodiments can be modified into various other forms, and the scope of the present disclosure is not limited to the following embodiments. The embodiments are provided to convey the idea of the present disclosure to those skilled in the art.

[0032] In the following drawings, for convenience and clarity of description, the thickness or size of each layer may be enlarged, and the same reference numerals in the drawings refer to the same or similar elements. As used herein, the term "and / or" includes any one of the listed items and any combination of one or more of the listed items. As used herein, the term "connected" refers not only to a direct connection between member A and member B, but also to an indirect connection between member A and member B with member C interposed between member A and member B.

[0033] The terms used in this specification are intended to describe particular embodiments and are not intended to limit the present disclosure. As used herein, the singular forms may include the plural forms unless the context clearly indicates otherwise. As used herein, the terms "comprise" (or "include") and / or "comprising" (or "including") are intended to indicate the presence of the stated figures, quantities, steps, operations, components, elements, and / or groups thereof, and do not preclude the presence or addition of one or more other figures, quantities, steps, operations, components, elements, and / or groups thereof.

[0034] Although terms such as "first" and "second" are used herein to describe various components, parts, regions, layers, and / or portions, the components, parts, regions, layers, and / or portions are not limited by the terms. The terms are used to distinguish one component, one part, one region, one layer, or one portion from another component, another part, another region, another layer, or another portion. Thus, without departing from the teachings of the present disclosure, the first component, the first part, the first region, the first layer, or the first portion described herein may refer to the second component, the second part, the second region, the second layer, or the second portion.

[0035] Spatial relative terms such as "beneath", "below", "lower", "above", and "upper" may be used to facilitate understanding of how one element or feature in the drawings is shown as different from another. The spatial relative terms are intended to facilitate understanding of the present disclosure in various process states or usage states and are not intended to limit the present disclosure. For example, if an element or feature in the drawing is flipped, the element or feature described as "beneath" or "below" becomes "above" or "upper". Thus, "beneath" encompasses the concepts of "above" and "below".

[0036] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It should also be understood that terms defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the relevant technical context and are explicitly defined herein unless they are interpreted in an ideal or overly formal sense.

[0037] In this document, the configuration of a battery pack according to an embodiment will be described.

[0038] Figure 1 is a perspective view showing a state in which a cover in a battery pack according to an embodiment is coupled to a battery cell; Figure 2 is an exploded perspective view showing a state in which the cover in the battery pack according to an embodiment is separated from the battery cell.

[0039] SeeFigure 1 and Figure 2 , according to one embodiment, the battery pack 100 may include a plurality of battery cells 110, a cover member 150 coupled to the battery cells 110 while covering the outer surfaces of the battery cells 110, a pack housing 160 coupled to the battery cells 110 through the lower surface of the cover member 150 (see Figure 3 ) and a cooling plate 170 located on the inner surface of the lower portion of the pack housing 160 (see Figure 3 ). In one or more embodiments, the battery pack 100 may further include a separator 120 interposed between adjacent battery cells (e.g., every two adjacent battery cells) among the battery cells 110. In one or more embodiments, the battery pack 100 may further include a heat insulating member 130 interposed between the lower surface of the battery cells 110 and the cover member 150.

[0040] Each of the battery cells 110 may include an electrode assembly provided therein. The electrode assembly may be formed such that each of a first electrode plate, a separator, and a second electrode plate formed in a thin plate shape or a film shape is stacked, or a stack of the first electrode plate, the separator, and the second electrode plate is wound. In some embodiments, the first electrode plate may operate as a negative electrode, and the second electrode plate may operate as a positive electrode. In other embodiments, the first electrode plate may operate as a positive electrode, and the second electrode plate may operate as a negative electrode. In one embodiment, each of the battery cells 110 may further include an electrode terminal (or terminals) 111.

[0041] For example, the first electrode plate may be formed by applying a first electrode active material such as graphite or carbon to a first electrode current collector formed of a metal foil made of copper or nickel, and may include a first electrode uncoated portion as an area where the first electrode active material is not applied. The first electrode uncoated portion may provide a channel for current flow between the first electrode plate and the outside.

[0042] For example, the second electrode plate may be formed by applying a second electrode active material such as a transition metal oxide to a second electrode current collector formed of a metal foil made of aluminum, and may include a second electrode uncoated portion as an area where the second electrode active material is not applied.

[0043] The separator may be located between the first electrode plate and the second electrode plate to prevent or substantially prevent short circuits and enable the movement of lithium ions. The separator may be formed as a film made of polyethylene, polypropylene, or a combination thereof.

[0044] The electrode assembly can be accommodated in a housing together with an electrolyte. The electrolyte can include an organic solvent such as ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), or dimethyl carbonate (DMC), and a lithium salt such as LiPF6 or LiBF4.

[0045] The housing can be sealed by components such as a cover plate or a side plate. As an example, Figure 2 Illustrate an embodiment in which the housing is sealed by a side plate, and electrode terminals 111 connected to a first electrode plate and a second electrode plate are formed on both sides or opposite sides of the battery cell 110. That is, the electrode terminals 111 can be located on the side portions of the battery cell 110. The electrode terminals 111 can be formed to protrude from both sides or opposite sides of the housing.

[0046] For example, each of the battery cells 110 can include an exhaust member formed in its lower surface. In one embodiment, the exhaust member can be formed to be thinner than other regions of the battery cell 110, and thus, if the internal pressure in the battery cell 110 is equal to or higher than a certain pressure (e.g., a reference pressure), the exhaust member can open earlier than other regions of the battery cell 110. If the internal pressure in the battery cell 110 is equal to or greater than the reference pressure, the exhaust member can guide the internal gas in the battery cell 110 to be discharged to the outside, thereby preventing or substantially preventing an accident such as an explosion. In one or more embodiments, the battery pack 100 can include a structure such as a bus bar for electrical connection of the battery pack formed on the side portion or the upper portion of the battery pack. In one embodiment, the exhaust member is formed in the lower surface of the battery cell 110, and the structure can be unaffected by the opening of the exhaust member of the battery cell 110.

[0047] The separator 120 can be disposed between adjacent battery cells (e.g., every two adjacent battery cells) in the battery cell 110. The separator 120 can allow adjacent battery cells 110 to be electrically isolated from each other and block heat transfer from one battery cell 110 to another adjacent battery cell 110. The separator 120 can be implemented as a thermal insulation sheet. For example, the separator 120 can be implemented as a ceramic paper sheet or a mica sheet.

[0048] The heat insulation member 130 may be disposed on the lower surface of the battery cell 110. The heat insulation member 130 may be disposed on the lower surface of the battery cell 110 where the exhaust member is formed. If any of the exhaust members in the battery cell 110 is opened, the high-temperature substance may be discharged from the corresponding battery cell 110. If the high-temperature substance spreads to an adjacent battery cell 110, for example, spreads to the exhaust member of an adjacent battery cell 110 that is vulnerable to heat, the exhaust member of the adjacent battery cell 110 may be opened. This may cause a problem that an event occurring in a certain battery cell 110 is transmitted to another adjacent battery cell 110. In one embodiment, since the heat insulation member 130 covers the outer side of the lower surface of the battery cell 110 where the exhaust member is formed, the heat insulation member 130 can prevent or substantially prevent any spread high-temperature substance from the battery cell 110 from directly contacting another battery cell 110. In one or more embodiments, the heat insulation member 130 may be disposed on the outer surface of the battery cell 110 so as to cover the exhaust member of the battery cell 110, and thus the heat insulation member 130 can protect the relatively heat-vulnerable exhaust member from the high-temperature spreading substance.

[0049] The heat insulation member 130 can block the heat transfer from any spread high-temperature substance in the battery cell 110 to another battery cell 110, and can be formed so that if the exhaust member operates due to the internal pressure in the corresponding battery cell 110, it is opened as the exhaust member is opened. Therefore, the heat insulation member 130 can protect the battery cell 110 from the high-temperature spreading substance without interfering with the operation of the exhaust member. In one embodiment, for example, the heat insulation member 130 may include mica (e.g., mica sheet).

[0050] The cover member 150 can surround the battery cell 110 to protect the battery cell 110 from external impacts. In one embodiment, the cover member 150 may include a lower cover member 151 disposed below the battery cell 110, a side cover member 152 disposed along the side surface of the battery cell 110, an upper cover member 153 disposed on the battery cell 110, and end cover members 154 coupled to the foremost and rearmost battery cells among the battery cells 110. In one or more embodiments, the cover member may be referred to as a plate.

[0051] The lower cover member 151 may be disposed on the outer surface of the heat insulation member 130, for example, on the lower surface of the heat insulation member 130. The lower cover member 151 can provide mechanical stiffness to the outer surface of the heat insulation member 130. The lower cover member 151 can prevent or substantially prevent the battery cell 110 from melting or breaking.

[0052] In one or more embodiments, the lower cover member 151 may include an opening 151a formed in a region of the lower cover member 151 corresponding to the exhaust member of the battery cell 110. Since the exhaust member does not interfere with the lower cover member 151 due to the opening 151a in the lower cover member 151, the operation of the exhaust member of the battery cell 110 is not disturbed or impeded.

[0053] In one or more embodiments, the lower cover member 151 may be formed such that only the region of the lower cover member 151 corresponding to the exhaust member of the battery cell 110 is open. Thus, even when the exhaust member formed in the lower surface of the battery cell 110 is opened, the lower cover member 151 can prevent or substantially prevent the electrode assembly from disengaging downward. The lower cover member 151 can prevent or substantially prevent heat transfer by preventing or substantially preventing the disengagement of the high-temperature electrode assembly when an event occurs.

[0054] As described below, the cooling plate 170 may be coupled to the lower surface of the lower cover member 151 to allow the heat generated in the battery cell 110 to dissipate through the lower surface of the lower cover member 151.

[0055] The side cover member 152 may be located on the lower cover member 151 and may be coupled to two side surfaces or opposite side surfaces of the battery cell 110. With this configuration, the side cover member 152 can protect the battery cell 110 and can allow the battery cells 110 to be electrically connected to each other.

[0056] In one embodiment, each of the side cover members 152 may include a side frame 152a arranged along the side surface of the battery cell 110 in the arrangement direction of the battery cells 110, a lower coupling frame 152b coupled to the lower side of the side frame 152b and coupled to the lower cover member 151 and the heat insulation member 130, and an upper coupling frame 152c coupled to the upper side of the side frame 152a and coupled to the upper cover member 153. In one or more embodiments, each of the side cover members 152 may further include a plurality of bus bars 152d coupled to the side portions of the side frame 152a and electrically connecting the electrode terminals 111 of the battery cell 110 exposed through the side frame 152a to each other, and an insulating cover 152e coupled to the outer surface of the bus bars 152d to cover the bus bars 152d.

[0057] The upper cover member 153 may be coupled to the side cover member 152 and may be disposed on the surface of the battery cell 110, for example, on the upper surface of the battery cell 110. For example, the upper cover member 153 may dissipate the heat from the battery cell 110 in a state of being in contact with the upper surface of the battery cell 110. For example, the upper cover member 153 may have an air cooling structure. In one embodiment, the upper cover member 153 may include heat sinks.

[0058] The end cover member 154 may be coupled to the foremost and rearmost battery cells among the battery cells 110. The end cover member 154 may be coupled to the lower cover member 151, the side cover members 152, and the upper cover member 153, and the battery cells 110 may be accommodated in the internal space defined by the cover members 151, 152, 153, and 154.

[0059] Figure 3 is an exploded perspective view showing a state in which a cooling plate in a battery pack is separated from battery cells according to an embodiment; Figure 4 is a partially enlarged view showing a state in which a cooling plate in a battery pack is coupled to battery cells according to an embodiment; Figure 5 is a rear perspective view of a cooling plate in a battery pack according to an embodiment; and Figure 6 is a partial perspective view of a cooling plate in a battery pack according to an embodiment.

[0060] See Figure 3 , the group housing 160 may be coupled to the lower surface of the cover member 150 and may cover the side surface and the lower surface of the cover member 150. With this configuration, the group housing 160 may accommodate the battery cells 110 coupled to the cover member 150. As an example, Figure 3 illustrates an embodiment in which the cover member 150 is coupled to the central region of the group housing 160. In other embodiments, a plurality of cover members 150 may be accommodated in the group housing 160, or other electronic components and the cover member 150 may be accommodated together in the group housing 160. The group housing 160 may protect the cover member 150 and the battery cells 110 accommodated in the group housing 160 and may connect the battery pack 100 to the outside.

[0061] See Figure 3 and Figure 4 , the cooling plate 170 may be located on the inner surface of the lower portion of the group housing 160. The cooling plate 170 may be in contact with the lower surface of the cover member 150 and may be thermally coupled to the battery cells 110 located inside the cover member 150. The cooling plate 170 may dissipate heat from the battery cells 110 in a state of being in contact with the lower surface of the battery cells 110. In one embodiment, the cooling type of the cooling plate 170 may be an air cooling type or a water cooling type. In one embodiment, if the cooling type of the cooling plate 170 is a water cooling type, the heat generated in the battery cells 110 may be dissipated to the outside through the refrigerant provided in the cooling plate 170.

[0062] The cooling plate 170 may include a plate portion 171 and a fastening portion 172 that fixes the edge of the plate portion 171 to the bottom surface of the group housing 160.

[0063] See Figures 3 to 6, in one embodiment, the plate portion 171 may be formed as a flat plate having a substantially rectangular shape. The plate portion 171 may support the cover member 150 disposed on the upper surface of the plate portion 171. In some embodiments, the plate portion 171 may accommodate a refrigerant therein to dissipate the heat transferred to the plate portion 171 to the outside through the cover member 150, thereby cooling the battery cell 110 provided inside the cover member 150.

[0064] In one embodiment, the plate portion 171 may include an exhaust protrusion 171a formed in an approximate central region in the width direction of the plate portion 171 at a position corresponding to the position of the exhaust member of the battery cell 110, and a flange portion 171b formed along the outer periphery of the exhaust protrusion 171a so as to protrude downward from the lower surface of the plate portion 171.

[0065] Holes corresponding to the exhaust members may be formed in the respective exhaust protrusions 171a, and the exhaust protrusions 171 may be formed along the outer periphery of the holes so as to protrude downward from the plate portion 171. Such exhaust protrusions 171a may provide stiffness to the area around the exhaust member of the battery cell 110. The exhaust protrusions 171a may protrude downward along the outer periphery of the exhaust member having a relatively small thickness compared to other areas of the battery cell 110, thereby protecting the exhaust member from external forces applied to the exhaust member. The exhaust protrusions 171a may expose the exhaust member through the holes formed in the exhaust protrusions 171a, and thus do not interfere with or impede the operation of the exhaust member. For example, when an event occurs, the exhaust member opens to allow the gas in the battery cell to be discharged to the outside through the exhaust member. In one embodiment, the exhaust protrusion 171a may be formed to have a height of about 1 mm to about 2 mm. If the height of the exhaust protrusion 171a is equal to or greater than 1 mm, the stiffness required to protect the exhaust member can be ensured, and if the height of the exhaust protrusion 171a is equal to or less than 2 mm, it may be suitable for reducing the total weight of the battery pack 100.

[0066] The flange portion 171b may be formed on the lower surface of the plate portion 171. With this shape, the flange portion 171b may increase the overall stiffness of the cooling plate 170 and may prevent or substantially prevent the sagging of the cooling plate 170. In one embodiment, the height of the flange portion 171b may be 1 mm to 2 mm greater than the height of the exhaust protrusion 171a.

[0067] If the height of the flange portion 171b is more than 1 mm greater than the height of the exhaust protrusion 171a, it may be suitable for reducing the total weight of the battery pack 100. If the height of the flange portion 171b is less than 2 mm greater than the height of the exhaust protrusion 171a, sufficient space through which the gas in the battery cell 110 can flow can be ensured.

[0068] In one or more embodiments, the flange portion 171b may be formed to bend substantially in a U-shape along the outer periphery of the exhaust protrusion portion 171a formed on the plate portion 171 so as to surround the exhaust protrusion portion 171a on three sides (or along three sides) or from three directions. If the exhaust member of the battery cell 110 is opened and the gas in the battery cell 110 is discharged from the exhaust member, the gas may first pass through the exhaust protrusion portion 171a, may move along the U-shaped flange portion 171b, and then may be discharged to the outside of the battery pack 100 through the open side of the flange portion 171b. The flange portion 171b can not only ensure the stiffness of the battery pack 100, but also facilitate the safe gas discharge by guiding the movement of the gas when an event occurs in the battery cell 110. In one embodiment, the flange portion 171b may expose the exhaust protrusion portion 171a in at least one direction.

[0069] As described above, in the battery pack 100 according to one or more embodiments, the cooling plate 170 in contact with the lower surface of the cover member 150 that houses the battery cell 100 may include an exhaust protrusion portion 171a formed corresponding to the exhaust member of the battery cell 110 and a flange portion 171b formed to surround at least one area around the exhaust protrusion portion 171a, thereby ensuring the stiffness of the cooling plate 170 and guiding the gas generated during an event to move smoothly or easily through the exhaust member.

[0070] It is obvious from the above description that a battery pack according to an embodiment may include a cooling plate provided to be in contact with the lower surface of a cover member that houses a battery cell, and the cooling plate may include an exhaust protrusion portion formed corresponding to the exhaust member of the battery cell and a flange portion formed to surround at least one area around the exhaust protrusion portion, thereby ensuring the stiffness of the cooling plate and guiding the gas generated during an event to move smoothly or easily through the exhaust member.

[0071] Although embodiments for implementing a battery pack according to the present disclosure have been described above, the present disclosure is not limited to the above embodiments, and those skilled in the art should understand that various modifications can be made without departing from the spirit and scope of the present disclosure as set forth in the claims.

Claims

1. A battery pack, characterized in that: The battery pack comprises: a plurality of battery cells including vents, each of the vents being located in a surface of a corresponding one of the plurality of battery cells; a cover member configured to cover the plurality of battery cells; and a cooling plate located in a region where the battery cells are located, the cooling plate being in contact with the cover member, The cooling plate includes an exhaust protrusion portion positioned corresponding to the exhaust member and protruding in a direction opposite to the cover member.

2. The battery pack according to claim 1, characterized in that: The exhaust protrusion has a height of 1 mm to 2 mm.

3. The battery pack according to claim 1, characterized in that: The exhaust protrusion portion is formed to have a shape corresponding to an outer circumference of the exhaust member.

4. The battery pack according to claim 1, characterized in that: The cooling plate includes holes at positions corresponding to positions of the exhaust member, and wherein each of the exhaust protrusions protrudes along an outer circumference of a corresponding one of the holes.

5. The battery pack according to claim 1, characterized in that: The cooling plate further includes a flange portion configured to surround at least one region around the exhaust protrusion portion.

6. The battery pack according to claim 5, characterized in that: The flange portion surrounds the exhaust protrusion portion along three sides.

7. The battery pack according to claim 5, characterized in that: The flange portion exposes the exhaust protrusion portion in at least one direction.

8. The battery pack according to claim 5, characterized in that: The flange portion protrudes higher than the exhaust protrusion portion.

9. The battery pack according to claim 8, characterized in that: The flange portion protrudes higher than the exhaust protrusion portion by 1 mm to 2 mm.

10. The battery pack according to claim 1, characterized in that: The battery pack further includes a pack case configured to surround the cover member and the cooling plate.

11. The battery pack according to claim 1, characterized in that: The cover member includes an opening at a position corresponding to a position of the air vent.

12. The battery pack according to claim 1, characterized in that: The battery pack further includes a heat insulation member between the plurality of battery cells and the cover member.

13. The battery pack according to claim 12, characterized in that: The thermal insulation member includes a mica sheet.

14. The battery pack according to claim 1, characterized in that: Each of the plurality of battery cells further includes a terminal on a side portion thereof on which the cooling plate is not present.

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