Battery pack and energy storage system including same

Abstract

A battery pack according to an embodiment of the present disclosure comprises: a plurality of battery cells; a pack case accommodating the plurality of battery cells, and having an exhaust unit configured to exhaust gas generated in the battery cells to the outside; and a cover member attached to the pack case and configured to open and close the exhaust unit.

Description

Technical Field

[0001] The present disclosure relates to a battery pack and an energy storage system (ESS) including the battery pack.

[0002] This application claims priority to Korean Patent Application No. 10-2023-0119307, filed in Korea on September 7, 2023, the disclosure of which is incorporated herein by reference.

[0003] This application claims priority to Korean Patent Application No. 10-2023-0149469, filed in Korea on November 1, 2023, the disclosure of which is incorporated herein by reference.

[0004] This application claims priority to Korean Patent Application No. 10-2023-0119308, filed in Korea on September 7, 2023, the disclosure of which is incorporated herein by reference.

[0005] This application claims priority to Korean Patent Application No. 10-2023-0159736, filed in Korea on November 17, 2023, the disclosure of which is incorporated herein by reference. Background Art

[0006] Since secondary batteries are easily applicable to different types of products and have electrical characteristics such as high energy density, secondary batteries are generally applied not only to portable devices but also to electric vehicles (EVs), hybrid electric vehicles (HEVs), or energy storage systems (ESSs). Secondary batteries significantly reduce the use of fossil fuels, and in addition to the main advantages, secondary batteries do not produce by-products due to the use of energy. From this perspective, secondary batteries are attracting attention as a more environmentally friendly and energy-efficient new energy source.

[0007] According to the charge / discharge capacity of the battery pack required for an electric vehicle (EV), a hybrid electric vehicle (HEV), or an energy storage system (ESS), a plurality of battery cells may be connected in series / parallel to form a battery pack. In this case, a battery module including at least one battery cell is generally formed, and then at least one battery module and additional other components are used together to form a battery pack or a battery rack. Alternatively, recently, a cell-to-pack type of battery pack has been manufactured by directly accommodating battery cells in a battery pack case without modularization.

[0008] However, in the case where a battery pack includes a large number of lithium secondary batteries, in the event of a fire or explosion, the damage will be greater. A fire in a battery pack starts with an abnormal temperature rise and gas generation in a battery cell within the battery pack. Therefore, when the internal pressure of the battery cell increases beyond a predetermined level, exhaust gas is generated, and high-temperature sparks, high-temperature gas including electrode active material and aluminum particles, and are discharged from the battery cell.

[0009] Therefore, to ensure the stability of the battery pack during use, when a thermal event such as thermal runaway occurs in the battery pack, it is necessary to quickly release the exhaust gas to the outside of the battery pack to prevent the internal pressure of the battery pack from continuing to increase. In the case where the exhaust gas is not properly released to the atmosphere, it may lead to faster propagation of thermal runaway between battery cells. Additionally, greater problems such as explosion may occur in the battery pack, so releasing the exhaust gas to the atmosphere is very important.

[0010] Conventional battery packs have an exhaust portion in the battery pack housing to release high-temperature exhaust gas to the outside of the battery pack housing when a thermal event occurs in a specific battery cell or battery module. In this case, the exhaust portion is hollow like a hole to guide the gas from the inside to the outside.

[0011] However, in the case of this type of battery pack, external impurities such as moisture may enter through the exhaust portion. In particular, when the cooling medium is supplied to the battery pack by water cooling rather than air cooling, condensation forms on the cooling pipes provided outside the battery pack, and moisture penetrates into the battery pack through the exhaust portion formed by the hole, resulting in the inability to ensure the waterproof performance of the battery pack.

[0012] Therefore, there is an emerging need for a technology that prevents impurities such as moisture from penetrating into the battery pack through the exhaust portion under normal conditions of the battery pack.

[0013] In addition, there is also an emerging need for a technology that quickly discharges high-temperature gas to the outside of the battery pack through the exhaust portion when a thermal event occurs in the battery pack to prevent heat accumulation or heat transfer in the battery pack and suppress flames. Summary of the Invention

[0014] Technical Problem

[0015] The present disclosure aims to solve the above problems, and thus the present disclosure relates to providing a battery pack and an energy storage system (ESS) including the battery pack: the battery pack is used to ensure safety and reliability in the abnormal situation of a battery cell or a battery module.

[0016] However, the problems to be solved by the present disclosure are not limited to the above problems, and those skilled in the art will clearly understand these and other problems based on the following description.

[0017] Technical solution

[0018] To solve the above problems, according to one aspect of the present disclosure, a battery pack includes: a plurality of battery cells; a battery pack housing that houses the plurality of battery cells and has an exhaust portion configured to discharge gas generated by the battery cells to the outside of the battery pack housing; and a cover attached to the battery pack housing and configured to open and close the exhaust portion.

[0019] The cover may be configured to: when the temperature and / or pressure in the battery pack housing reaches at least one of a specific temperature or a specific pressure, the cover is opened to discharge the gas generated by the battery cells to the outside.

[0020] The battery pack housing may include ribs configured to cover at least a part of the exhaust portion.

[0021] The cover may be attached to the outer surface of the battery pack housing along the outer periphery of the exhaust portion.

[0022] The cover may be attached to the inner surface of the battery pack housing along the outer periphery of the exhaust portion and directly face the ribs.

[0023] The ribs may include a thickness reduction portion facing the inner surface of the battery pack housing.

[0024] The ribs may be inclined toward the outside of the battery pack housing.

[0025] The exhaust portion may include a plurality of exhaust holes defined by the ribs, and the cover is configured to open in at least two of the plurality of exhaust holes at different pressures or temperatures.

[0026] The battery pack may further include an opening / closing member disposed in the battery pack housing and configured to open and close at least one of the plurality of exhaust holes.

[0027] The exhaust portion may include a plurality of exhaust portions, and at least some of the plurality of exhaust portions may have different sizes.

[0028] The battery pack may further include a cooling unit disposed in the battery pack housing and configured to allow a cooling medium to flow, and the cover may be disposed on a side of the battery pack housing where the cooling unit is located.

[0029] According to an embodiment of the present disclosure, the battery pack may further include an exhaust device installed in the exhaust portion and configured to open and close.

[0030] The cover member can be attached to the outside of the exhaust device and is configured such that when the exhaust device is opened, the cover member is opened together to discharge gas to the outside of the battery pack housing.

[0031] The exhaust device can have a protrusion configured to protrude toward the cover member.

[0032] In addition, an energy storage system (ESS) according to the present disclosure can include a battery pack according to the present disclosure.

[0033] Advantageous Effects

[0034] According to one aspect of the present disclosure, the waterproof and dustproof functions of the battery pack can be ensured, thereby preventing moisture or dust from infiltrating into the battery pack and ensuring the safety and reliability of the battery pack.

[0035] In addition, according to one aspect of the present disclosure, when gas is generated in the event of an abnormality in the battery cell, the exhaust can be released to the outside of the battery pack housing, thereby effectively ensuring the heat propagation prevention performance of the battery pack.

[0036] Furthermore, according to one aspect of the present disclosure, heat accumulation in the battery pack housing can be prevented, thereby preventing thermal damage to other battery cells or battery modules.

[0037] In addition, according to one aspect of the present disclosure, when the exhaust is completely released to the outside of the battery pack housing, oxygen entry into the battery pack housing can be prevented, thereby preventing or suppressing flames in the battery pack.

[0038] Therefore, events such as fires or explosions caused by thermal runaway in the battery pack or equipment including the battery pack can be prevented or delayed.

[0039] In addition, the present disclosure can also have many other effects, and these effects will be described in each embodiment, or the corresponding descriptions will be omitted for effects that are easily inferred by those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings illustrate exemplary embodiments of the present disclosure and are used together with the following detailed description to provide a better understanding of the technical aspects of the present disclosure. Therefore, the present disclosure should not be construed as being limited to the drawings.

[0041] Figure 1 is a complete perspective view of a battery pack according to an embodiment of the present disclosure.

[0042] Figure 2 is a perspective view showing the interior of a battery pack according to an embodiment of the present disclosure.

[0043] Figure 3 is an enlarged cross-sectional view of a cover in a battery pack according to an embodiment of the present disclosure.

[0044] Figure 4 is a cross-sectional view showing an embodiment of the cover in an open state in a battery pack according to an embodiment of the present disclosure.

[0045] Figure 5 is a view showing the exhaust direction in a battery pack according to an embodiment of the present disclosure. For example, Figure 5 is Figure 1 a cross-sectional view taken along line I-I', showing some components at the front side.

[0046] Figure 6 is an enlarged cross-sectional view of a cover in a battery pack according to another embodiment of the present disclosure.

[0047] Figure 7 is an enlarged perspective view of a main part of a battery pack according to another embodiment of the present disclosure.

[0048] Figure 8 is a front view of a battery pack according to an embodiment of the present disclosure.

[0049] Figure 9 is an enlarged view of a main part of a battery pack according to an embodiment of the present disclosure.

[0050] Figure 10 is an enlarged view of a main part of a battery pack according to another embodiment of the present disclosure.

[0051] Figure 11 is a front perspective view of a battery pack according to an embodiment of the present disclosure.

[0052] Figure 12 is a rear perspective view of a battery pack according to an embodiment of the present disclosure.

[0053] Figure 13 is a view showing an exhaust device separated from a battery pack housing in a battery pack according to another embodiment of the present disclosure.

[0054] Figure 14 is an enlarged perspective view of an exhaust device in a battery pack according to another embodiment of the present disclosure.

[0055] Figure 15 is a cross-sectional view showing the exhaust device in a closed state in a battery pack according to another embodiment of the present disclosure. For example, Figure 15 is Figure 1 a cross-sectional view taken along line I-I', showing some components at the front side.

[0056] Figure 16 is a cross-sectional view showing an embodiment of an exhaust device in an open state in a battery pack according to another embodiment of the present disclosure. For example, Figure 16 is Figure 1 a cross-sectional view taken along line I-I', showing some components at the front side.

[0057] Figure 17 is a view showing an exhaust device of a battery pack according to another embodiment of the present disclosure.

[0058] Figure 18 is a view showing an exhaust device of a battery pack according to another embodiment of the present disclosure.

[0059] Figure 19 is a view showing an exhaust device of a battery pack according to another embodiment of the present disclosure.

[0060] Figure 20 is a front view showing a main part of a battery pack including a cover according to another embodiment of the present disclosure.

[0061] Figure 21 is a cross-sectional view of a battery pack including a cover according to another embodiment of the present disclosure.

[0062] Figure 22 is a cross-sectional view showing an embodiment of a cover in an open state in a battery pack according to another embodiment of the present disclosure.

[0063] Figure 23 is a front view showing a main part of a battery pack including a cover according to another embodiment of the present disclosure.

[0064] Figure 24 is a cross-sectional view showing an embodiment of a cover in an open state in a battery pack according to another embodiment of the present disclosure.

[0065] Figure 25 is a cross-sectional view showing an embodiment of a cover in an open state in a battery pack according to another embodiment of the present disclosure. Detailed Description

[0066] Figure 1 is a complete perspective view of a battery pack according to an embodiment of the present disclosure, Figure 2 is a perspective view showing the interior of a battery pack according to an embodiment of the present disclosure, and Figure 3 is an enlarged cross-sectional view showing a cover in a battery pack according to an embodiment of the present disclosure. Additionally, Figure 4 is a cross-sectional view showing an embodiment of a cover in an open state in a battery pack according to an embodiment of the present disclosure. Additionally, Figure 5It is a view showing the exhaust direction in a battery pack according to an embodiment of the present disclosure. For example, Figure 5 It may be Figure 1 a cross-sectional view taken along line I-I', showing some components at the front side.

[0067] Referring to Figures 1 to 5 , the battery pack 10 according to an embodiment of the present disclosure includes battery cells 100, a battery pack housing 200, and a cover 300.

[0068] First, mainly referring to Figure 2 , the battery cells 100 may include a plurality of battery cells. Although not shown in the drawings, the plurality of battery cells 100 may include: an electrode assembly; a battery cell housing that houses the electrode assembly; and electrode leads that are connected to the electrode assembly and extend outward from the battery cell housing to serve as electrode terminals. In this case, the plurality of battery cells 100 may be electrically connected to each other.

[0069] The battery cells 100 may be pouch-type secondary batteries. The battery cell housing of the pouch-type secondary battery may be formed in a pouch shape including an aluminum metal layer disposed between polymer layers.

[0070] As Figure 2 shown, the plurality of battery cells 100 may be arranged side by side in the left-right direction (X-axis direction) when in an upright position in the vertical direction (Z-axis direction). In this case, each battery cell 100 may have a sealing portion facing the front-back direction (Y-axis direction) and the upward direction (+Z-axis direction), and a receiving portion facing the left-right direction (X-axis direction).

[0071] The plurality of battery cells 100 may be stacked side by side in the left-right direction (X-axis direction) to form a battery cell array. As Figure 2 shown, the battery cell array may include a plurality of battery cell arrays arranged side by side in the front-back direction (Y-axis direction).

[0072] Meanwhile, the present disclosure is not limited to a specific type or shape of the battery cells 100, and various types of battery cells 100 known at the time of application may be used to form the battery pack 10 of the present disclosure.

[0073] In addition, the battery pack 10 according to an embodiment of the present disclosure may include terminals and / or bus bar assemblies electrically connected to the plurality of battery cells 100 housed therein.

[0074] The battery pack housing 200 may be configured to accommodate the plurality of battery cells 100. That is, the battery pack housing 200 may provide a receiving space for accommodating the plurality of battery cells 100. The battery pack housing 200 may be made of a material having mechanical strength or include a material having mechanical stiffness, such as steel or stainless steel (SUS) or plastic, to safely protect the battery cells 100 accommodated therein.

[0075] In addition, the battery pack housing 200 may include an exhaust portion V. The exhaust portion V may be configured to discharge the gas generated by the battery cells 100 accommodated in the battery pack housing 200 to the outside of the battery pack housing 200. The exhaust portion V may enable the interior of the battery pack housing 200 to communicate with the outside.

[0076] The exhaust portion V may be formed in a hole shape. That is, the exhaust portion V may be formed in the shape of a hole located in the battery pack housing 200, and the exhaust portion V is configured to communicate the interior of the battery pack housing 200 with the outside. For example, the exhaust portion V may be circular. In this case, depending on the internal structure of the battery pack housing 200, the position, shape, or structure of the exhaust portion V in the battery pack housing 200 may be designed differently.

[0077] Meanwhile, the battery pack 10 according to an embodiment of the present disclosure includes a cover member 300. The cover member 300 may be configured to open and close the exhaust portion V. Specifically, referring to Figure 4 and Figure 5 , the cover member 300 may be held attached to the battery pack housing 200 to cover the exhaust portion V under normal circumstances and may be opened under specific circumstances.

[0078] Through the above exemplary configuration of the present disclosure, since the cover member 300 is configured to cover the exhaust portion V, impurities such as dust can be prevented from infiltrating into the battery pack housing 200 through the exhaust portion V. Therefore, the dust-proof function of the battery pack 10 can be ensured, thereby ensuring the safety and reliability of the battery pack 10.

[0079] Specifically, the cover member 300 may be configured to: when the temperature and / or pressure in the battery pack housing 200 reaches at least one of a specific temperature or a specific pressure, the cover member is opened. For example, when the cover member 300 is removed from or separated from the battery pack housing 200, the cover member 300 may be opened, or a part of the cover member 300 may be broken due to the pressure of the gas.

[0080] Through the above exemplary configuration of the present disclosure, when an abnormal situation occurs in the battery pack 10, the cover member 300 may be asFigure 5 open as shown by the solid arrow shown, so as to quickly discharge the gas generated from the battery cell 100 to the outside of the battery pack housing 200 through the exposed portion of the exhaust portion V. Therefore, when an abnormal situation occurs in the battery cell 100, the pressure rise in the battery pack housing 200 can be prevented, and the spread of fire to other battery cells 100 can be prevented. Therefore, through the above aspect of the present disclosure, the safety and reliability of the battery pack 10 can be ensured.

[0081] In addition, the cover 300 may be attached to the battery pack housing 200. That is, the cover 300 may be attached to the battery pack housing 200 to completely cover the exhaust portion V. The cover 300 may be adhered to the battery pack housing 200. For example, the cover 300 may have a tape or include an adhesive surface similar to a tape.

[0082] Through the above exemplary configuration of the present disclosure, under normal circumstances, the cover 300 can maintain the adhesion strength with the battery pack housing 200 to cover the exhaust portion V. On the contrary, when at least one of a specific temperature or a specific pressure is reached, the cover 300 can be easily cracked to expose the exhaust portion V, so as to quickly discharge the internal gas to the outside of the battery pack housing 200.

[0083] The cover 300 may be configured to prevent moisture penetration. For example, the cover 300 may include a seal to prevent moisture from seeping into the battery pack housing 200. Alternatively, the cover 300 may have any structure or material for preventing moisture from seeping in. For example, the cover 300 may be made of a waterproof material such as a waterproof tape. Through the above exemplary configuration of the present disclosure, moisture can be prevented from seeping into the battery pack 10 through the exhaust portion V, thereby ensuring the waterproof function of the battery pack 10.

[0084] In addition, the cover 300 may be made of a material having heat resistance. The battery pack 10 may generate heat during repeated charging and discharging during normal operation. In addition, a device including the battery pack 10 (for example, an energy storage system) may be placed in a situation where it is exposed to more heat, especially in a high temperature situation such as summer.

[0085] Through the above exemplary configuration of the present disclosure, under the normal condition of the battery pack 10, the cover 300 can stably maintain covering the exhaust portion V. In addition, in the case where some battery cells 100 included in the battery pack 10 generate high-temperature gas, when the high-temperature gas is lower than a specific temperature, especially when no thermal event occurs in the battery pack 10 or the battery pack 10 can be used normally, the cover 300 may not open.

[0086] Meanwhile, as Figure 3 shown in and other drawings, the battery pack housing 200 included in the battery pack 10 according to an embodiment of the present disclosure may include ribs R. The ribs R may be configured to cover at least a portion of the exhaust portion V. The ribs R may be configured to support the cover member 300.

[0087] With the above-exemplary configuration of the present disclosure, as the contact area between the cover member 300 and the battery pack housing 200 increases, in a normal condition of the battery pack 10, the cover member 300 may be more firmly supported or held adhered to the battery pack housing 200. Accordingly, moisture or dust may be more effectively prevented from infiltrating into the battery pack housing 200 through the cover member 300.

[0088] The rib R may extend across the exhaust portion V. In particular, the rib R may extend from one end of the exhaust portion V to the other end. For example, the rib R may extend from the left side of the hole forming the exhaust portion V to the right side. Additionally, the rib R may extend from the top of the hole forming the exhaust portion V to the bottom.

[0089] A plurality of ribs R may be provided in one exhaust portion V. In this case, the plurality of ribs R may extend in different directions. In particular, one exhaust portion V may include two ribs R, and the two ribs R may extend in the horizontal direction and the vertical direction, respectively. Additionally, as Figure 2 shown in the embodiment, the ribs R may be arranged in a cross shape. Contrary to the above embodiment, the size or area of the rib R may be appropriately designed according to the gas components.

[0090] With the above-exemplary configuration of the present disclosure, the rib R may more stably support and protect the cover member 300. Further, in this case, large impurities may be effectively prevented from infiltrating into the battery pack housing 200 through the exhaust portion V while damaging the cover member 300. Accordingly, the safety during manufacturing or use of the battery pack 10 may be ensured.

[0091] The cover member 300 may be attached to one surface of the battery pack housing 200. According to an embodiment of the present disclosure, as Figures 3 to 5 shown, the cover member 300 may be attached to the outer surface of the battery pack housing 200. With the above-exemplary configuration of the present disclosure, the cover member 300 may be opened more quickly to the outside of the battery pack housing 200 by the airflow flowing to the outside of the battery pack housing 200. Additionally, the battery pack 10 may be manufactured only by assembling the battery pack housing 200 and attaching the cover member 300 to the outside of the battery pack housing 200, thereby improving the assembly efficiency.

[0092] The edge of the cover member 300 can be attached to the battery pack housing 200 along the outer periphery of the exhaust portion V. That is, the edge region of the cover member 300 can be configured to be completely adhered along the outer periphery of the exhaust portion V. In this case, the cover member 300 can be larger than the cross-sectional area of the exhaust portion V to completely cover the exhaust portion V.

[0093] In this case, the cover member 300 can be circular. When the shapes of the exhaust portion V and the cover member 300 are similar to the above-exemplary configurations of the present disclosure, the adhesion area can be uniform. In this case, the cover member 300 can be less likely to be pushed open by gas at other temperatures and pressures than at a non-specific temperature and a specific pressure. Additionally, specific portions of the exhaust portion V or the cover member 300 can be prevented from being damaged under normal or abnormal conditions.

[0094] Figure 6 is an enlarged cross-sectional view showing a cover member in a battery pack according to another embodiment of the present disclosure.

[0095] According to another embodiment of the present disclosure, as Figure 6 shown, the cover member 300 can be attached to the inner surface of the battery pack housing 200 along the outer periphery of the exhaust portion V. In this case, the cover member 300 can be configured to directly face the rib R.

[0096] Additionally, the cover member 300 can be configured to contact the rib R. For example, the rib R can protrude further inward than the inner surface of the battery pack housing 200. Thus, the end of the protruding portion of the rib R can be configured to contact the cover member 300.

[0097] The rib R includes a thickness reduction portion toward the inner surface of the battery pack housing 200. For example, the rib R can include a thickness reduction portion toward the inner surface of the battery pack housing 200 in the left-right direction and / or the up-down direction.

[0098] Through the above-exemplary configuration of the present disclosure, when an abnormal situation occurs in the battery pack 10, the cover member 300 can be more easily caused to rupture at the contact area between the protruding rib R and the cover member 300.

[0099] Figure 7 is an enlarged perspective view showing a main part of a battery pack according to another embodiment of the present disclosure.

[0100] The rib R may be inclined toward the outside of the battery pack housing 200. Specifically, the rib R extending in the vertical direction may be inclined to discharge gas toward both sides of the battery pack housing 200. That is, when the rib R is viewed from the top, the cross-section of the rib R may be inclined toward the outside of the battery pack housing 200.

[0101] Through the above exemplary configuration of the present disclosure, since the rib R is inclined, when the cover 300 is opened to discharge gas, the gas can be guided toward the outside of the battery pack housing 200 rather than toward the central region of the battery pack housing 200. In this case, it is possible to prevent the gas discharged through any exhaust portion V from entering the battery pack housing 200 again through other adjacent exhaust portions V.

[0102] Figure 8 is a front view of a battery pack according to an embodiment of the present disclosure, Figure 9 is an enlarged view showing a main part of a battery pack according to an embodiment of the present disclosure.

[0103] The exhaust portion V may include a plurality of exhaust holes H defined by the rib R. For example, as Figure 9 shown, the rib R may be arranged in a cross shape to define four exhaust holes H.

[0104] In this case, among at least two of the plurality of exhaust holes H, the pressure or temperature at which the cover 300 is opened may be different. Through the above exemplary configuration of the present disclosure, among some of the plurality of exhaust holes H, the pressure or temperature at which the cover 300 is opened may be different to allow a user to design the exhaust direction as needed. Therefore, even in the same battery pack 10, the exhaust direction can be designed differently according to the usage environment or location, thereby achieving cost savings and productivity improvement.

[0105] For example, for at least two of the plurality of exhaust holes H, the cover 300 may have different thicknesses. That is, in one cover 300, the thickness may be different according to the position of the exhaust hole H. The thickness of the cover 300 may be adjusted in such a way that a part of the cover 300 may be multilayered while a part of the cover 300 may be thicker.

[0106] Therefore, at a specific pressure or temperature, the thicker part of the cover 300 may not open. For example, the part of the cover 300 covering the upper exhaust hole H among the plurality of exhaust holes H may have a greater thickness and may not open at a specific pressure or temperature, thereby keeping the exhaust hole H closed. Therefore, only the part of the cover 300 covering the lower exhaust hole H may break and open to discharge gas downward.

[0107] Alternatively, contrary to the above-described embodiment, the cover member 300 and the battery pack housing 200 may have different adhesion strengths. That is, in the same cover member 300, depending on the position of the vent hole H, the cover member 300 may have different adhesion strengths. Accordingly, a portion of the cover member 300 having a weaker adhesion strength may be opened at a specific pressure or temperature, while a portion of the cover member 300 having a stronger adhesion strength may not be opened at a specific pressure or temperature. Thus, the user can set the exhaust direction as needed by adjusting the adhesion strength of the cover member 300.

[0108] Figure 10 is an enlarged view showing a main part of a battery pack according to another embodiment of the present disclosure.

[0109] Reference Figure 10 , a battery pack 10 according to another embodiment of the present disclosure may further include an opening / closing member 500. The opening / closing member 500 may be configured to open and close at least one of the plurality of vent holes H. In other words, the opening / closing member 500 may be configured to selectively open or close at least some of the plurality of vent holes H.

[0110] The opening / closing member 500 may be disposed in the battery pack housing 200. Specifically, as Figure 10 shown, the opening / closing member 500 may be disposed on an outer surface of the battery pack housing 200 and at a position more outward than the rib R and the cover member 300.

[0111] Through the above exemplary configuration of the present disclosure, the user can adjust the number or position of the vent holes H through which the discharged gas passes by means of the opening / closing member 500, thereby discharging the gas in a desired direction.

[0112] The opening / closing member 500 may have any structure for selectively opening or closing the plurality of vent holes H. According to one embodiment, the opening / closing member 500 may include a housing and a cover. The housing is coupled to the battery pack housing 200 and is configured to cover one vent hole H. The cover is disposed in the housing and is configured to extend outward from the housing. The cover may be selectively configured to be disposed in the housing to cover only one vent hole H, or to extend outward from the housing to cover at least one of the remaining vent holes H. To extend the cover outward from the housing, the cover may have a protrusion.

[0113] For example, in an embodiment of the present disclosure, the exhaust portion V may include a plurality of exhaust portions. Any one of the exhaust portions V in the exhaust portion V may fully open the opening / closing member 500 to discharge a large amount of gas, and any other exhaust portion V may cause the lid of the opening / closing member 500 to extend to close all the exhaust holes H so as not to discharge gas into the atmosphere. Therefore, gas can be discharged only through the exhaust portion V located at the open portion of the opening / closing member 500, and thus the exhaust direction can be freely adjusted.

[0114] Figure 11 is a front perspective view of a battery pack according to an embodiment of the present disclosure, and Figure 12 is a rear perspective view of a battery pack according to an embodiment of the present disclosure.

[0115] Reference Figure 2 、 Figure 11 and Figure 12 According to, a battery pack housing 200 according to an embodiment of the present disclosure may include a substrate 210 and side plates 220.

[0116] The substrate 210 may be configured to be mounted on the upper surfaces of a plurality of battery cells 100. The substrate 210 may form the lower surface of the battery pack housing 200 and have a rectangular plate shape. Additionally, the substrate 210 may have a flat upper surface to stably mount the plurality of battery cells 100.

[0117] The side plates 220 may extend upward from each side (edge) of the substrate 210. The side plates 220 may include a plurality of unit walls to cover the sides of the plurality of battery cells 100. More specifically, the side plates 220 may include a front plate 221, a rear plate 222, and end plates 223. The front plate 221 is located at the end of the substrate 210 in the -Y axis direction and is configured to cover the front side of the battery cell 100. The rear plate 222 is located at the end of the substrate 210 in the +Y axis direction and is configured to cover the rear side of the battery cell 100. The end plates 223 are located at the ends of the substrate 210 in the +X axis direction and -X axis direction and are configured to cover both sides of the battery cell 100.

[0118] The exhaust portion V may be provided in a side portion of the battery pack housing 200, that is, in the side plate 220. In this case, a cover member 300 may be attached to the side plate 220 to cover the exhaust portion V.

[0119] The exhaust portion V and the cover member 300 may each include a plurality of exhaust portions and a plurality of cover members, respectively. In particular, the exhaust portion V may be located in at least some of the plurality of unit walls of the side plate 220. The exhaust portion V may be provided on both sides of the side plate 220. For example, referenceFigure 11 and Figure 12 As shown, the exhaust part V can be provided in each of the front plate 221 and the rear plate 222.

[0120] In addition, the exhaust part V can be separately formed in each of two or more unit walls, and two or more exhaust parts V can be formed in one unit wall. A plurality of exhaust parts V can exist on each side of both sides of the side plate 220. For example, referring to Figure 11 and Figure 12 As shown, two exhaust parts V can exist in each of the front plate 221 and the rear plate 222.

[0121] In this case, for each exhaust part V, a corresponding cover 300 can be installed. For example, as shown in the exemplary configurations of Figure 11 and Figure 12 , each of the front plate 221 and the rear plate 222 can have two exhaust parts V, and the cover 300 can be provided separately for each exhaust part V. Therefore, a total of four covers 300 can be included in the battery pack 10.

[0122] In one unit wall, a plurality of exhaust parts V and a plurality of covers 300 can be spaced apart from each other in the horizontal direction (e.g., the left - right direction). In addition, each of the plurality of exhaust parts V and the plurality of covers 300 can be symmetric with respect to the front plate 221 and the rear plate 222.

[0123] Through the above - mentioned exemplary configuration of the present disclosure, in the case of an abnormality of the battery cell 100, high - temperature gas can be discharged in two directions of the battery pack housing 200 through the exhaust parts V symmetrically provided on both sides of the battery pack housing 200. In particular, in one unit wall, in the ends where the two exhaust parts V are located, the electrode leads or hollow spaces of the plurality of battery cells 100 can be positioned. Therefore, it is easy to discharge the gas generated by the battery cells from the inside of the battery pack housing 200 to the outside of the battery pack housing 200 faster.

[0124] Meanwhile, as described in the embodiments based on Figure 2 , Figure 11 and Figure 12 , the number or position of the installed exhaust parts V and covers 300 are provided as examples and can be changed to any other number or position.

[0125] In addition, at least some of the plurality of exhaust parts V can have different sizes. For example, the exhaust part V of the front plate 221 and the exhaust part V of the rear plate 222 can have different sizes. Alternatively, the exhaust parts V in the same front plate 221 or rear plate 222 can have different sizes.

[0126] The smaller exhaust portion V has a smaller exhaust area, which increases the exhaust speed. Therefore, when a specific pressure or a specific temperature is reached, it is more likely that the lid member 300 covering the smaller exhaust portion V will open, so that gas can be discharged toward the smaller exhaust portion V.

[0127] With the above exemplary configuration of the present disclosure, the user can set the exhaust direction according to the direction or position of the battery pack 10. Therefore, even in the same battery pack 10, the exhaust direction can be designed differently according to the use environment or position, thereby achieving cost savings and productivity improvement.

[0128] For example, when the front side of the battery pack 10 faces forward, the area of the exhaust portion V provided in the rear plate 222 can be larger than the area of the exhaust portion V provided in the front plate 221. Therefore, a larger amount of gas can be discharged through the exhaust portion V provided in the rear plate 222, so that the user in front of the battery pack 10 can be protected.

[0129] Meanwhile, mainly referring to Figure 1 、 Figure 11 and Figure 12 , the battery pack housing 200 may further include a top plate 230.

[0130] The top plate 230 may be configured to cover the tops of the plurality of battery cells 100. To this end, the top plate 230 may be coupled to the tops of the side plates 220 to form the upper surface of the battery pack housing 200. The top plate 230 can protect internal components such as the battery cells 100 and prevent the exhaust from the battery cells 100 from being released to the outside of the battery pack housing 200, especially upward to the outside of the battery pack housing 200.

[0131] In particular, the top plate 230 can guide the exhaust and sparks in the internal space of the battery pack housing 200 toward the exhaust portion V. Specifically, as shown by the solid arrows in Figure 5 , the exhaust can move along the upper inner surface of the battery pack housing 200 to the exhaust portion V. The gas moving upward can be guided to the front plate 221 and the rear plate 222 having the exhaust portion V and discharged to the outside of the battery pack housing 200 through the exhaust portion V. Therefore, with the above exemplary configuration of the present disclosure, when an abnormal situation occurs in the battery pack 10, the gas generated from the battery cells 100 does not diffuse in all directions, but can be quickly discharged to the atmosphere through the exhaust portion V, thereby preventing heat transfer between the battery cells 100.

[0132] Meanwhile, the top plate 230 and the substrate 210 may protrude further outward than the side plates 220. For example, asFigure 5 , Figure 11 and Figure 12 As shown in Figure 5 , Figure 11 , and Figure 12 , the top plate 230 and the base plate 210 may protrude further outward than the front plate 221 and the rear plate 222.

[0133] With the above exemplary configuration of the present disclosure, when an abnormal situation occurs in the battery pack 10, it is possible to prevent the gas discharged through the exhaust portion V from moving upward or downward to the battery pack 10 when the cover 300 is opened. Therefore, when a plurality of battery packs 10 of the present disclosure are included in other devices, heat transfer to adjacent battery packs 10 can be prevented.

[0134] Meanwhile, the battery pack 10 according to an embodiment of the present disclosure may further include a cooling unit 400. The cooling unit 400 may be configured to allow a cooling medium to flow. Specifically, the cooling unit 400 may include an inlet port 410 and an outlet port 420. The inlet port 410 may be configured to allow the cooling medium to enter the battery pack housing 200, and the outlet port 420 may be configured to allow the cooling medium to leave the battery pack housing 200.

[0135] The inlet port 410 and the outlet port 420 may be provided on one side of the battery pack housing 200. For example, as Figure 11 shown, the inlet port 410 and the outlet port 420 may be provided on the side where the front plate 221 is located. In this case, the cover 300 may be provided on the side of the battery pack housing 200 where the cooling unit 400 is located.

[0136] The inlet port 410 and the outlet port 420 may be connected to a hose through which the cooling medium flows. With the above exemplary configuration of the present disclosure, the cover 300 may be provided in an area where the cooling medium is likely to condense, to prevent moisture generated by condensation from infiltrating into the battery pack housing 200.

[0137] Figure 13 FIG. Figure 13 is a view showing an exhaust device separated from a battery pack housing in a battery pack according to another embodiment of the present disclosure, Figure 14 FIG. Figure 14 is an enlarged perspective view showing an exhaust device in a battery pack according to another embodiment of the present disclosure. Additionally, Figure 15 FIG. Figure 15 is a cross-sectional view showing the exhaust device in a closed state in a battery pack according to another embodiment of the present disclosure. Additionally, Figure 16 FIG. Figure 16 is a cross-sectional view showing an embodiment of the exhaust device in an open state in a battery pack according to another embodiment of the present disclosure. For example, Figure 15 and Figure 16 are Figure 1 cross-sectional views taken along line I-I' of Figure 1 , showing some components at the front side.

[0138] The battery pack 10 according to an embodiment of the present disclosure may include an exhaust device 600. The exhaust device 600 may be installed in the battery pack housing 200. The exhaust device 600 may be configured to be installed in the exhaust portion V.

[0139] The exhaust device 600 may be coupled to one surface of the side plate 220. For example, the exhaust device 600 may be coupled to the outer surface of the side plate 220. In this case, the exhaust device 600 may be coupled to the outer surface of the side plate 220 by bolt connection. In the above embodiment, the exhaust device 600 may have a larger size than the exhaust portion V to completely cover the exhaust portion V. Through the above exemplary configuration of the present disclosure, productivity can be improved by assembling the exhaust device 600 outside the battery pack housing 200 after the battery pack housing 200 is completed, rather than assembling the exhaust device 600 in the complex battery pack housing 200.

[0140] In addition, the exhaust device 600 may be configured to open and close. Specifically, as Figure 15 shown, the exhaust device 600 is not open and may remain closed when the pressure is below a specific pressure, as Figure 16 shown, the exhaust device 600 may be configured to open only when the gas pressure due to a thermal event in the battery pack 10 is equal to or higher than a specific pressure.

[0141] The exhaust device 600 may be configured to be opened by the pressure of the gas to discharge the gas generated from the battery cells 100 accommodated inside the battery pack housing 200 to the outside of the battery pack housing 200. Through the above exemplary configuration of the present disclosure, when an abnormal situation occurs in the battery pack 10, as Figure 16 shown by the solid arrow in, the exhaust device 600 may be opened to quickly discharge the gas generated from the battery cells 100 to the outside of the battery pack housing 200 through the opening portion of the exhaust device 600. Therefore, when an abnormal situation occurs in the battery cells 100, the pressure rise in the battery pack housing 200 can be prevented, and the spread of fire to other battery cells 100 can be prevented. Therefore, through the above aspects of the present disclosure, the safety and reliability of the battery pack can be ensured.

[0142] In addition, through the above exemplary configuration of the present disclosure, when the exhaust is completely released to the outside of the battery pack housing 200, oxygen can be prevented from entering the battery pack housing 200 through the closed exhaust device 600. Therefore, the flame in the battery pack 10 can be prevented or suppressed.

[0143] In addition, with the above-described exemplary configuration of the present disclosure, it is possible to prevent the exhaust gas released into the atmosphere from re-entering the battery pack housing 200.

[0144] Specifically, referring to Figure 16 , when the gas pressure inside the battery pack 10 is equal to or higher than a specific pressure due to a thermal event in the battery pack 10, the exhaust device 600 may be configured to open in the direction of the gas pressure generated by the battery cell 100. Specifically, the exhaust device 600 may be configured to open only in one direction, and the direction may be defined as the direction from the inside of the battery pack housing 200 toward the outside (the outward direction of the battery pack housing 200).

[0145] With the above-described exemplary configuration of the present disclosure, the gas inside the battery pack housing 200 can be guided to be discharged in a specific direction, that is, discharged to the outside of the battery pack housing 200, by the exhaust device 600 that opens only in one direction. In addition, with the above-described exemplary configuration of the present disclosure, it is possible to prevent the gas discharged to the outside of the battery pack housing 200 from re-entering the battery pack housing 200.

[0146] Meanwhile, the present disclosure is not limited to a specific type or shape of the exhaust device 600 as long as the exhaust device 600 has a directivity, and various types of exhaust devices 600 known at the time of filing the application can be used to form the battery pack 10 of the present disclosure.

[0147] Figure 17 is a view showing an exhaust device of a battery pack according to another embodiment of the present disclosure.

[0148] Reference will be made to Figure 17 and Figure 15 and Figure 16 to describe the structure of the exhaust device 600 in detail. The exhaust device 600 may include a mounting portion 610, a cover portion 620, and a hinge portion 630.

[0149] The mounting portion 610 may be coupled to the battery pack housing 200. As described above, when the mounting portion 610 is inserted into the exhaust portion V of the battery pack housing 200 or is coupled to one surface of the battery pack housing 200, the exhaust device 600 can be mounted in the battery pack housing 200. The mounting portion 610 may have a discharge hole 611 through which the exhaust is released. That is, the mounting portion 610 may have an annular shape.

[0150] The cover part 620 may be configured to cover the discharge hole 611. The cover part 620 may have a plate shape. The cover part 620 may be coupled to the mounting part 610. The cover part 620 may be disposed at an inner position more inward than the mounting part 610 and be mounted in the mounting part 610.

[0151] The exhaust device 600 may include a hinge part 630, and the cover part 620 may be coupled to the mounting part 610 through the hinge part 630. The hinge part 630 may be rotatably configured on one side of the cover part 620. Accordingly, the cover part 620 may be rotatably configured. In addition, the hinge part 630 may include an elastic body having elasticity or be formed of an elastic body having elasticity.

[0152] Through the above exemplary configuration of the present disclosure, in the normal condition of the battery pack 10 where no thermal event occurs, the cover part 620 may maintain covering the discharge hole 611 by the elastic force of the hinge part 630. In addition, the exhaust device 600 may not be opened due to an external force or vibration acting on the battery pack 10.

[0153] Meanwhile, when a thermal event occurs in the battery pack 10, the cover part 620 may be configured to open in the direction of the pressure of the gas. That is, when the internal pressure is equal to or higher than a specific pressure due to the gas in the battery pack housing 200, the internal pressure may be greater than the elastic force that keeps the hinge part 630 closed, so that the hinge part 630 may rotate to open the cover part 620. To this end, the elastic modulus or material of the hinge part 630 may be designed such that the hinge part 630 rotates at a specific pressure or at a pressure higher than the specific pressure.

[0154] Through the above exemplary configuration of the present disclosure, under normal circumstances, the cover part 620 may remain closed to maintain the impurity penetration prevention performance of the battery pack 10, including waterproof or dustproof performance, while when a thermal event occurs, the cover part 620 may open to prevent heat accumulation in the battery pack 10.

[0155] Reference Figure 15 and Figure 17 and, the mounting part 610 may include an inclined part 612. The inclined part 612 may slope downward from the edge of the discharge hole 611. Through the above exemplary configuration of the present disclosure, when the cover part 620 opens at a specific pressure or at a pressure higher than the specific pressure, the opening operation of the cover part 620 may not be blocked by the mounting part 610, or the inclined part 612 may guide the opening direction of the cover part 620.

[0156] Figure 18A view showing an exhaust device of a battery pack according to another embodiment of the present disclosure.

[0157] Reference Figure 18 , the exhaust device 600 may further include an inner seal 640. The inner seal 640 may be disposed along the outer periphery of the discharge hole 611. The inner seal 640 may be disposed between the cover portion 620 and the mounting portion 610. The inner seal 640 may be made of an elastic material, such as silicone resin.

[0158] With the above exemplary configuration of the present disclosure, by using the inner seal 640, when the cover portion 620 is not opened in the mounting portion 610, gas leakage through the space between the cover portion 620 and the mounting portion 610 can be prevented.

[0159] Figure 19 A view showing an exhaust device of a battery pack according to another embodiment of the present disclosure.

[0160] Reference Figure 19 , the exhaust device 600 may further include a stop protrusion 650. The stop protrusion 650 may protrude upward from the mounting portion 610. In this case, the cover portion 620 may be disposed at a position more inward than the stop protrusion 650. Therefore, with the above exemplary configuration of the present disclosure, in the closed state, the cover portion 620 may be fixed by the stop protrusion 650, and thus the cover portion 620 may not be easily opened under a pressure lower than a specific pressure or in the event of vibration.

[0161] The stop protrusion 650 may be made of an elastic material. With the above exemplary configuration of the present disclosure, when the cover portion 620 is to be opened, the cover portion 620 may bend outward and be released from fixation. Alternatively, the cover portion 620 may be released from fixation by the rupture of the stop protrusion 650.

[0162] Alternatively, contrary to the above embodiment, when the cover portion 620 covers the discharge hole 611, the stop protrusion 650 may protrude outward from the mounting portion 610 to fix the cover portion 620, and at a specific pressure, the stop protrusion 650 may move in the outward direction of the mounting portion 610 to open the cover portion 620. Therefore, when the cover portion 620 is to be opened, the cover portion 620 may be released from the stop protrusion 650.

[0163] Figure 20 A front view showing a main part of a battery pack including a cover member according to another embodiment of the present disclosure, Figure 21 A cross-sectional view of a battery pack including a cover member according to another embodiment of the present disclosure, and Figure 22FIG. 0 is a cross-sectional view showing an example of a lid in an open state in a battery pack according to another embodiment of the present disclosure.

[0164] The lid 300 may be configured to cover the exhaust device 600. The lid 300 may be attached to the battery pack housing 200. The lid 300 may be attached to the outside of the exhaust device 600. That is, the lid 300 may be attached to the battery pack housing 200 and configured to cover at least a part of the exhaust device 600. In this case, as Figure 20 shown, the width of the lid 300 may be greater than that of the exhaust device 600 to completely cover the exhaust device 600 in the horizontal direction. Alternatively, the lid 300 may be attached to the exhaust device 600, specifically, to the mounting portion 610.

[0165] With the above exemplary configuration of the present disclosure, the lid 300 can prevent the exhaust device 600 from being easily opened, so that the exhaust device 600 is not easily opened by a gas at a temperature and pressure below a specific temperature and pressure.

[0166] Referring to Figure 21 and Figure 22 , under normal circumstances, the lid 300 may remain attached to the battery pack housing 200 to cover the exhaust device 600 and open under specific circumstances. Specifically, when the pressure in the battery pack housing 200 reaches a specific pressure and then the exhaust device 600 is opened, the lid 300 may be opened together. For example, as Figure 22 shown, the lid 300 may open when detached and separated from the battery pack housing 200.

[0167] With the above exemplary configuration of the present disclosure, under normal circumstances, moisture can be prevented from penetrating into the battery pack 10, and when an abnormal situation occurs in the battery pack 10, the exhaust device 600 and the lid 300 can open as shown by the solid arrows in Figure 22 to quickly discharge the gas generated from the battery cell 100 to the outside of the battery pack housing 200 through the opened portion of the exhaust device 600.

[0168] Therefore, when an abnormal situation occurs in the battery cell 100, an increase in pressure in the battery pack housing 200 can be prevented, and the spread of fire to other battery cells 100 can be prevented. Therefore, through the above aspects of the present disclosure, the safety and reliability of the battery pack 10 can be ensured.

[0169] Figure 23is a front view showing a main part of a battery pack including a cover according to another embodiment of the present disclosure, Figure 24 is a cross-sectional view showing an embodiment of the cover in an open state in a battery pack according to another embodiment of the present disclosure.

[0170] According to another embodiment of the present disclosure, as in Figure 23 and Figure 24 In the illustrated embodiment, the cover 300 may have a rupture line 310. The rupture line 310 may be formed along an area where the exhaust device 600 is opened. For example, the rupture line 310 may be formed along the outer periphery of the cover portion 620 of the exhaust device 600.

[0171] Therefore, as Figure 16 shown, when the pressure in the battery pack housing 200 reaches a specific pressure and the exhaust device 600 is opened, the cover 300 may rupture along the rupture line 310, making it easier to open.

[0172] With the above exemplary configuration of the present disclosure, even when the cover 300 is arranged corresponding to the area of the exhaust device 600 or the adhesion strength of the cover 300 is strong, the cover 300 can be easily ruptured to quickly discharge gas into the atmosphere.

[0173] Figure 25 is a cross-sectional view showing an embodiment of the cover in an open state in a battery pack according to another embodiment of the present disclosure.

[0174] Alternatively, in the embodiment as Figure 25 shown, the exhaust device 600 may have a protrusion 660 protruding toward the cover 300. The protrusion 660 may be provided at the lower end of the cover portion 620. The protrusion 660 may be configured such that at least a part of the cover portion 620 protrudes.

[0175] With the above exemplary configuration of the present disclosure, when the pressure in the battery pack housing 200 reaches a specific pressure and the exhaust device 600 is opened, the cover 300 can be easily ruptured corresponding to the opening area of the exhaust device 600 by the thrust of the protrusion 660 on the cover 300. Therefore, gas can be discharged to the outside of the battery pack housing 200 more quickly.

[0176] An energy storage system (ESS) according to an embodiment of the present disclosure includes a battery pack 10 according to the present disclosure. The energy storage system (ESS) may include, for example, a battery container including a plurality of battery packs 10 and a container housing for accommodating the stacked plurality of battery packs 10. The energy storage system (ESS) may include one or more battery systems.

[0177] In addition, the present disclosure may include various battery systems, and the battery systems include a battery pack 10 according to the present disclosure. For example, a battery system according to the present disclosure may include a battery charging system, a battery swapping system, and a battery repair system according to the present disclosure.

[0178] Furthermore, the present disclosure may include a vehicle having a battery pack 10 according to the present disclosure. A vehicle according to the present disclosure may include, for example, an electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle. The vehicle may include a four-wheeled vehicle and a two-wheeled vehicle. The vehicle may be operated using the power supplied from the battery pack 10 according to an embodiment of the present disclosure.

[0179] Although the exemplary embodiments of the present disclosure have been shown and described above, the present disclosure is not limited to the above specific embodiments, and various modifications and variations can be made by those of ordinary skill in the art without departing from the claimed subject matter of the present disclosure, and these variations should not be understood separately from the technical aspects or prospects of the present disclosure.

[0180] 10: Battery pack

[0181] 100: Battery cell

[0182] 200: Battery pack housing

[0183] V: Exhaust part

[0184] H: Exhaust hole

[0185] R: Rib

[0186] 210: Substrate

[0187] 220: Side plate

[0188] 221: Front plate

[0189] 222: Rear plate

[0190] 223: End plate

[0191] 230: Top plate

[0192] 300: Cover

[0193] 310: Rupture line

[0194] 400: Cooling unit

[0195] 410: Inlet port

[0196] 420: Outlet port

[0197] 500: Open / close member

[0198] 600: Exhaust device

[0199] 610: Mounting part

[0200] 611: Discharge hole

[0201] 612: Inclined part

[0202] 620: Cover part

[0203] 630: Hinge part

[0204] 640: Inner seal

[0205] 650: Stopper projection

[0206] 660: Projection

Claims

1. A battery pack, comprising: a plurality of battery cells; a battery pack housing that houses the plurality of battery cells and has an exhaust portion configured to discharge gas generated from the battery cells to the outside of the battery pack housing; and a cover attached to the battery pack housing and configured to open and close the exhaust portion.

2. The battery pack according to claim 1, wherein, The cover is configured to be opened to discharge the gas generated by the battery cells to the outside when at least one of a temperature or a pressure in the battery pack housing reaches a specific temperature or a specific pressure.

3. The battery pack according to claim 1, wherein The battery pack housing includes ribs configured to cover at least a part of the exhaust portion.

4. The battery pack according to claim 3, wherein, The cover is attached to an outer surface of the battery pack housing along an outer periphery of the exhaust portion.

5. The battery pack according to claim 3, wherein, The cover is configured to be attached to an inner surface of the battery pack housing along an outer periphery of the exhaust portion and directly face the ribs.

6. The battery pack according to claim 5, wherein, The ribs include a thickness reduction portion facing an inner surface of the battery pack housing.

7. The battery pack according to claim 3, wherein, The ribs are inclined toward an outside of the battery pack housing.

8. The battery pack according to claim 3, wherein, The exhaust portion includes a plurality of exhaust holes defined by the ribs, and wherein the cover is configured to be opened in at least two of the plurality of exhaust holes at different pressures or temperatures.

9. The battery pack according to claim 3, wherein, The exhaust portion includes a plurality of exhaust holes defined by the ribs, and wherein the battery pack further includes an opening / closing member disposed in the battery pack housing and configured to open and close at least one of the plurality of exhaust holes.

10. The battery pack according to claim 1, wherein, The exhaust portion includes a plurality of exhaust portions, and wherein at least some of the exhaust holes in the plurality of exhaust portions have different sizes.

11. The battery pack according to claim 1, further comprising: a cooling unit disposed in the battery pack housing and configured to allow a cooling medium to flow, and wherein the cover is disposed on a side of the battery pack housing where the cooling unit is located.

12. The battery pack according to claim 1, further comprising an exhaust device installed in the exhaust portion and configured to open and close.

13. The battery pack according to claim 12, wherein, The cover is attached to an outside of the exhaust device and configured to be opened together with the exhaust device when the exhaust device is opened so as to discharge gas to the outside of the battery pack housing.

14. The battery pack according to claim 12, wherein, The exhaust device has a protruding portion configured to protrude toward the cover.

15. An energy storage system (ESS) comprising the battery pack according to any one of claims 1-14.

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