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 priority to and the benefit of Korean Patent Application No. 10-2023-0095340 filed in the Korean Intellectual Property Office on July 21, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] Aspects of embodiments of the present disclosure are directed to a battery pack capable of reducing heat transfer to cells adjacent thereto when a predetermined event occurs in a certain battery cell and preventing sagging of a case. Background Art

[0004] Unlike non-rechargeable primary batteries, secondary batteries are rechargeable and dischargeable batteries. Low-capacity secondary batteries in which one battery cell is packaged in a group can be used in portable small electronic devices such as mobile phones and cameras, and large-capacity secondary batteries in which, for example, dozens of battery cells are connected to each other in a battery pack are widely used as power sources for driving motors in hybrid vehicles, etc.

[0005] The 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 contained in a housing, and a cap plate is mounted on the housing. Representative examples of electrode assemblies may include a wound electrode assembly and a stacked electrode assembly. In such an electrode assembly, an electrode tab may protrude in an upward or lateral direction, and a current collector may be connected to the electrode tab.

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

[0007] The information disclosed in this section is provided only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute relevant art. Summary of the invention

[0008] According to aspects of an embodiment of the present disclosure, there is provided a battery pack capable of reducing heat transfer to cells adjacent thereto and preventing or substantially preventing sagging of a case when an event occurs in a certain battery cell.

[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 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 an area where the battery cells are located and in contact with the cover member, wherein the cooling plate includes an exhaust protrusion portion positioned corresponding to the exhaust member and protruding in a direction opposite to the cover member.

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

[0011] In one or more embodiments, the exhaust protrusion portion may be formed to have a shape corresponding to the outer circumference of the exhaust member.

[0012] In one or more embodiments, the cooling plate may include a hole at a position corresponding to a position of the exhaust member, and each of the exhaust protrusion portions may protrude along an outer circumference 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 zone around the exhaust protrusion portion.

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

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

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

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

[0018] In one or more embodiments, the battery pack may further include a pack case 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 location corresponding to the location of the vent.

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

[0021] In one or more embodiments, the insulation member may include a mica sheet.

[0022] In one or more embodiments, each of the plurality of battery cells may further include a terminal on a side portion thereof without the cooling plate being present. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[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 fully illustrate the present disclosure to those of ordinary skill in the art; however, the following embodiments may 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 ideas of the present disclosure to those skilled in the art.

[0032] In the following drawings, for the convenience and clarity of description, the thickness or size of each layer may be magnified, 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 "connection" refers not only to the direct connection between component A and component B, but also to the indirect connection between component A and component B and component C is between component A and component B.

[0033] The terms used in this specification are intended to describe specific embodiments and are not intended to limit the present disclosure. As used herein, singular forms may include 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 described figures, quantities, steps, operations, components, elements and / or groups thereof, and do not exclude 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 members, components, regions, layers and / or portions, the members, components, regions, layers and / or portions are not limited by the terms. The terms are used to distinguish one member, one component, one region, one layer or one portion from another member, another component, another region, another layer or another portion. Therefore, without departing from the teachings of the present disclosure, a first member, a first component, a first region, a first layer or a first portion described herein may refer to a second member, a second component, a second region, a second layer or a second portion.

[0035] Spatially related terms such as "under," "below," "down," "above," and "on" may be used to facilitate understanding that one element or feature in the drawings is shown as being different from another element or feature. Spatially related terms are intended to facilitate understanding of the present disclosure in various process states or use states, and are not intended to limit the present disclosure. For example, if an element or feature in a figure is turned over, an element or feature described as "under" or "below" becomes "above" or "on." Therefore, "under" is a concept that includes "above" and "below."

[0036] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which the inventive concept belongs. It should also be understood that the terms defined in commonly used dictionaries should be interpreted as having the same meaning as that in the relevant technical content and are clearly defined in this article unless they are interpreted in an ideal or overly formal sense.

[0037] Herein, a 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 is coupled to a battery cell in a battery pack according to an embodiment; Figure 2 is an exploded perspective view illustrating a state in which a cover is separated from a battery cell in a battery pack according to an embodiment.

[0039] See also Figure 1 and Figure 2 A battery pack 100 according to an embodiment may include a plurality of battery cells 110, a cover member 150 coupled to the battery cells 110 while covering the outer surface of the battery cells 110, and a pack case 160 coupled to the battery cells 110 through the lower surface of the cover member 150 (see Figure 3 ) and a cooling plate 170 (see Figure 3 In one or more embodiments, the battery pack 100 may further include a spacer 120 between adjacent battery cells (eg, 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 between the lower surface of the battery cell 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 so that each of the first electrode plate, the separator, and the second electrode plate formed in a thin plate shape or a film shape is stacked, or the stack of the first electrode plate, the separator, and the second electrode plate is wound. In some embodiments, the first electrode plate may be operated as a negative electrode and the second electrode plate may be operated as a positive electrode. In other embodiments, the first electrode plate may be operated as a positive electrode and the second electrode plate may be operated as a negative electrode. In one embodiment, each of the battery cells 110 may further include an electrode terminal (or terminal) 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 as 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 path 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 collector formed as a metal foil made of aluminum, and may include a second electrode uncoated portion as a region 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 a short circuit and enable movement of lithium ions. The separator may be formed as a film made of polyethylene, polypropylene, or a combination thereof.

[0044] The electrode assembly may be housed in a housing together with an electrolyte. The electrolyte may 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 may be sealed by components such as a cover or side panels. As an example, Figure 2 An embodiment is illustrated in which the case is sealed by the side plates, and the electrode terminals 111 coupled to the first electrode plate and the second electrode plate are formed on both sides or opposite sides of the battery cell 110. That is, the electrode terminals 111 may be located on the side portions of the battery cell 110. The electrode terminals 111 may be formed so as to protrude from both sides or opposite sides of the case.

[0046] For example, each of the battery cells 110 may include a vent formed in its lower surface. In one embodiment, the vent may be formed to be thinner than other areas of the battery cell 110, and therefore, if the internal pressure in the battery cell 110 is equal to or higher than a certain pressure (e.g., a reference pressure), the vent may be opened earlier than other areas of the battery cell 110. If the internal pressure in the battery cell 110 is equal to or greater than the reference pressure, the vent may guide the internal gas in the battery cell 110 to be discharged to the outside, thereby preventing or substantially preventing accidents such as explosions. In one or more embodiments, the battery pack 100 may include a structure such as a bus bar formed on a side portion or an upper portion of the battery pack for electrical connection of the battery pack. In one embodiment, the vent is formed in the lower surface of the battery cell 110, and the structure may not be affected by the opening of the vent of the battery cell 110.

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

[0048] The heat insulation member 130 may be arranged on the lower surface of the battery cell 110. The heat insulation member 130 may be arranged on the lower surface of the battery cell 110 where the vent is formed. If any of the vents 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 the adjacent battery cell 110, for example, spreads to the vent of the adjacent battery cell 110 that is susceptible to heat, the vent of the adjacent battery cell 110 may be opened. This may cause the problem of an event occurring in a certain battery cell 110 being transmitted to another battery cell 110 adjacent thereto. In one embodiment, because the heat insulation member 130 covers the outer side of the lower surface of the battery cell 110 where the vent is formed, the heat insulation member 130 can prevent or substantially prevent any spread of high temperature substances from the battery cell 110 from directly contacting another battery cell 110. In one or more embodiments, the insulation member 130 may be disposed on an outer surface of the battery cell 110 so as to cover the vent of the battery cell 110 , and thus the insulation member 130 may protect the vent, which is relatively susceptible to heat, from high temperature diffused substances.

[0049] The heat insulating member 130 may block heat transfer from any dispersed high temperature substance in the battery cell 110 to another battery cell 110, and may be formed so as to be opened with the opening of the vent if the vent operates due to internal pressure in the corresponding battery cell 110. Therefore, the heat insulating member 130 may protect the battery cell 110 from the high temperature dispersed substance without interfering with the operation of the vent. In one embodiment, for example, the heat insulating member 130 may include mica (e.g., a mica sheet).

[0050] The cover member 150 may surround the battery cell 110 to protect the battery cell 110 from external impact. 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 an end cover member 154 coupled to the frontmost 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 an outer surface of the insulation member 130, for example, on a lower surface of the insulation member 130. The lower cover member 151 may provide mechanical rigidity to the outer surface of the insulation member 130. The lower cover member 151 may prevent or substantially prevent the battery cells 110 from melting or rupturing.

[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 so that only the area of ​​the lower cover member 151 corresponding to the vent of the battery cell 110 is open. Therefore, even if the vent formed in the lower surface of the battery cell 110 is opened, the lower cover member 151 may prevent or substantially prevent the electrode assembly from being disengaged downward. The lower cover member 151 may prevent or substantially prevent heat transfer by preventing or substantially preventing the high temperature electrode assembly from being disengaged when an event occurs.

[0054] As described below, the cooling plate 170 may be coupled to a lower surface of the lower cover member 151 so as to allow heat generated in the battery cells 110 to be dissipated 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 both side surfaces or opposite side surfaces of the battery cell 110. With this configuration, the side cover member 152 may protect the battery cell 110 and may 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 a side surface of the battery cell 110 in an arrangement direction of the battery cell 110, a lower coupling frame 152b coupled to a 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 an 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 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 an outer surface of the bus bar 152d to cover the bus bar 152d.

[0057] The upper cover member 153 may be coupled to the side cover member 152 and may be arranged 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 heat from the battery cell 110 while 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 a heat sink.

[0058] The end cover members 154 may be coupled to the frontmost and rearmost battery cells among the battery cells 110. The end cover members 154 may be coupled to the lower cover member 151, the side cover member 152, and the upper cover member 153, and the battery cell 110 may be accommodated in an inner 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 is separated from a battery cell in a battery pack according to an embodiment; 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; 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 also Figure 3 , the pack 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 pack housing 160 may accommodate the battery cell 110 coupled to the cover member 150. As an example, Figure 3 An embodiment is illustrated in which the cover member 150 is coupled to the central area of ​​the pack case 160. In other embodiments, a plurality of cover members 150 may be accommodated in the pack case 160, or other electronic components and the cover member 150 may be accommodated together in the pack case 160. The pack case 160 may protect the cover member 150 and the battery cell 110 accommodated in the pack case 160, and may connect the battery pack 100 to the outside.

[0061] See also Figure 3 and Figure 4 , the cooling plate 170 may be located on the inner surface of the lower portion of the pack 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 cell 110 located inside the cover member 150. The cooling plate 170 may dissipate heat from the battery cell 110 while in contact with the lower surface of the battery cell 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 cell 110 may be dissipated to the outside by the refrigerant provided in the cooling plate 170.

[0062] The cooling plate 170 may include a plate portion 171 and a fastening portion 172 fixing an edge of the plate portion 171 to the bottom surface of the pack case 160 .

[0063] See also Figure 3 to Figure 6In 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 contain a refrigerant therein to dissipate 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 a vent protrusion portion 171a formed in an approximately central area in the width direction of the plate portion 171 at a position corresponding to the position of the vent member of the battery cell 110, and a flange portion 171b formed along the periphery of the vent protrusion portion 171a so as to protrude downward from the lower surface of the plate portion 171.

[0065] A hole corresponding to the exhaust member may be formed in each exhaust protrusion 171a, and the exhaust protrusion 171 may be formed along the periphery of the hole so as to protrude downward from the plate portion 171. Such an exhaust protrusion 171a may provide rigidity to the area around the exhaust member of the battery cell 110. The exhaust protrusion 171a may protrude downward along the 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 protrusion 171a may expose the exhaust member through the hole formed in the exhaust protrusion 171a, and thus there is no interference or obstruction to the operation of the exhaust member, for example, when the exhaust member is opened to allow the gas in the battery cell to be discharged to the outside through the exhaust member when an event occurs. 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 vent protrusion 171 a is equal to or greater than 1 mm, the rigidity required to protect the vent may be ensured, and if the height of the vent protrusion 171 a is equal to or less than 2 mm, it may be suitable for reducing the overall 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 rigidity of the cooling plate 170 and may prevent or substantially prevent 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 portion 171a.

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

[0068] In one or more embodiments, the flange portion 171b may be formed to be bent in a substantially U-shape along the periphery of the exhaust protrusion 171a formed on the plate portion 171 so as to surround the exhaust protrusion 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 171a, may move along the U-shaped flange portion 171b, and may then be discharged to the outside of the battery pack 100 through the open side of the flange portion 171b. The flange portion 171b may not only ensure the rigidity of the battery pack 100, but may also facilitate 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 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 that contacts the lower surface of the cover member 150 that accommodates the battery cell 110 may include a vent protrusion 171a formed corresponding to the vent member of the battery cell 110 and a flange portion 171b formed so as to surround at least one area around the vent protrusion 171a, thereby ensuring the rigidity of the cooling plate 170 and guiding the gas generated when an event occurs to move smoothly or easily through the vent member.

[0070] It is obvious from the above description that a battery pack according to one embodiment may include a cooling plate provided so as to contact the lower surface of a cover member accommodating a battery cell, and the cooling plate may include a vent protrusion portion formed corresponding to a vent member of the battery cell and a flange portion formed so as to surround at least one zone around the vent protrusion portion, thereby ensuring the rigidity of the cooling plate and guiding the gas generated when an event occurs to move smoothly or easily through the vent 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 will appreciate that various modifications may be made without departing from the spirit and scope of the present disclosure as set forth in the claims.

Claims

1. A battery pack comprising: 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; as well as 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 , wherein the exhaust protrusion has a height of 1 mm to 2 mm. 3 . The battery pack according to claim 1 , wherein 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, wherein the cooling plate includes a hole at a position corresponding to a position of the vent 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 , wherein the cooling plate further comprises a flange portion configured to surround at least one area around the exhaust protrusion portion. The battery pack according to claim 5 , wherein the flange portion surrounds the exhaust protrusion portion along three sides. 7 . The battery pack according to claim 5 , wherein the flange portion exposes the exhaust protrusion portion in at least one direction. 8 . The battery pack according to claim 5 , wherein the flange portion protrudes higher than the exhaust protrusion portion. 9 . The battery pack according to claim 8 , wherein the flange portion protrudes higher than the exhaust protrusion portion by 1 mm to 2 mm. 10 . The battery pack according to claim 1 , further comprising a pack case configured to surround the cover member and the cooling plate. 11 . The battery pack according to claim 1 , wherein the cover member includes an opening at a position corresponding to a position of the vent. 12 . The battery pack according to claim 1 , further comprising a heat insulation member between the plurality of battery cells and the cover member. 13 . The battery pack according to claim 12 , wherein the heat insulating member comprises a mica sheet. 14 . The battery pack according to claim 1 , wherein each of the plurality of battery cells further comprises a terminal on a side portion thereof on which the cooling plate is absent.

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