Battery pack

Abstract

According to an exemplary embodiment of the present invention, there is provided a battery pack including: a housing including a base plate and a sidewall coupled to the base plate; a plurality of battery cell assemblies disposed on an upper surface of the base plate; and a plurality of exhaust devices coupled to the base plate.

Description

[Technical Field]

[0001] The present invention relates to a battery pack. This application claims the benefit of Korean Application No. 10-2023-0088276, filed on July 7, 2023, which is incorporated herein by reference in its entirety. [Background technology]

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for a variety of wireless devices, such as handsets, laptops, and wireless vacuum cleaners. In recent years, improvements in energy density and economies of scale have dramatically reduced the manufacturing cost per unit capacity of secondary batteries. As the driving range of battery electric vehicles (BEVs) has increased to the same level as fuel-powered vehicles, the primary use of secondary batteries has shifted from mobile devices to mobility.

[0003] Since the safety of secondary batteries is directly related to the lives of vehicle occupants, the core issue in the technological development of vehicle secondary batteries is improving their safety. To improve the safety of secondary batteries, it is essential to design an efficient exhaust path for the high-temperature gas inside the secondary battery. Summary of the Invention [Problem to be solved by the invention]

[0004] The problem to be solved by the technical idea of ​​the present invention is to provide a battery pack with improved safety. [Means for solving the problem]

[0005] According to an exemplary embodiment of the present invention to solve the above-mentioned problems, there is provided a battery pack including: a housing including a base plate and a sidewall coupled to the base plate; a plurality of battery cell assemblies disposed on an upper surface of the base plate; and a plurality of exhaust devices coupled to the base plate.

[0006] Each of the plurality of exhaust devices is of a valve type.

[0007] Each of the plurality of exhaust devices is a rupture disk.

[0008] The base plate includes a plurality of base holes connected to the plurality of exhaust devices.

[0009] Each of the plurality of exhaust devices includes an exhaust hole connected to a corresponding one of the plurality of base holes.

[0010] The battery pack, wherein each of the plurality of exhaust devices includes an exhaust hole connected to a corresponding one of the plurality of base holes.

[0011] The width of each of the plurality of base holes is in the range of 30 mm to 100 mm.

[0012] The width of the exhaust hole of each of the plurality of exhaust devices is smaller than the width of each of the plurality of base holes.

[0013] The shape of the exhaust hole of each of the plurality of exhaust devices is different from the shape of the plurality of base holes.

[0014] Each of the base holes has a square shape, and the cross-sectional shape of the exhaust hole of each of the exhaust devices is circular.

[0015] Each of the base holes is connected to two or more of the plurality of exhaust devices.

[0016] The plurality of exhaust devices are arranged asymmetrically.

[0017] The exhaust system further includes a plurality of exhaust brackets for securing the plurality of exhaust devices to the base plate.

[0018] The exhaust bracket abuts the top surface of the base plate.

[0019] The base plate includes an electrical component mounting area in which a plurality of electrical components are arranged, and a battery mounting area overlapping the plurality of battery cell assemblies.

[0020] The plurality of exhaust devices are arranged in the electrical component mounting area.

[0021] Each of the plurality of exhaust devices is spaced apart from the plurality of battery cell assemblies. [Effects of the Invention]

[0022] The battery cell assembly according to an exemplary embodiment of the present invention includes an exhaust device coupled to a base plate of a housing, which allows hot gases to be effectively exhausted in the event of a thermal runaway event, thereby improving the safety of the battery pack.

[0023] The effects that can be obtained from the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood from the following description by a person having ordinary skill in the art to which the exemplary embodiments of the present disclosure belong. In other words, unintended effects accompanying the implementation of the exemplary embodiments of the present disclosure can also be derived from the exemplary embodiments of the present disclosure by a person having ordinary skill in the art. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 2 is a plan view illustrating a battery pack according to an exemplary embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along the line AA′ in FIG. [Figure 3] FIG. 3 is an enlarged partial cross-sectional view of a portion of FIG. 2. [Figure 4] 2 shows a vehicle including the battery pack of FIG. 1. [Figure 5] FIG. 10 is a plan view illustrating an exhaust device according to another exemplary embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before that, the terms and words used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention, based on the principle that an inventor can appropriately define the concepts of terms to best describe his or her own invention.

[0026] Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and there may be various equivalents and modifications that can replace them at the time of this application.

[0027] Furthermore, in the description of the present invention, if it is determined that a detailed description of related publicly known structures or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0028] Since the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or shown in a schematic manner for clearer explanation. Therefore, the sizes and proportions of each component do not completely reflect the actual sizes and proportions.

[0029] (First embodiment) FIG. 1 is a plan view illustrating a battery pack according to an exemplary embodiment.

[0030] FIG. 2 is a cross-sectional view taken along the line AA' in FIG.

[0031] FIG. 3 is an enlarged partial cross-sectional view of the partial POR of FIG.

[0032] 1 to 3, a battery pack 100 may include a housing 110, a plurality of battery cell assemblies 120, a plurality of exhaust device brackets 130, a plurality of exhaust devices 140, and a lead plate 150. The battery pack 100 is the final form of a battery system to be installed in a mobility device or the like.

[0033] The housing 110 may provide a space for arranging a plurality of battery cell assemblies 120. The housing 110 may include a base plate 111 and side walls 112, 113, 114, and 115.

[0034] Two directions substantially parallel to the upper surface 111U of the base plate 111 are defined as the X direction and the Y direction, and a direction substantially perpendicular to the upper surface 111U of the base plate 111 is defined as the Z direction. The X direction, the Y direction, and the Z direction may be substantially perpendicular to each other. Unless otherwise specified, the definitions of the directions are the same for the following drawings.

[0035] The base plate 111 may include a plurality of plates joined together by friction stir welding. The base plate 111 may include a plurality of cooling channels through which a cooling fluid flows. The base plate 111 may include a plurality of cavities, which may reduce the weight of the base plate 111. Each of the plurality of cooling channels and the plurality of cavities may extend in the X direction.

[0036] The base plate 111 may include a battery mounting region BMR and an electrical component mounting region EMR. The battery mounting region BMR and the electrical component mounting region EMR may be regions separated from each other. The battery mounting region BMR and the electrical component mounting region EMR may divide the base plate 111. The battery mounting region BMR may be a space for the battery cell assemblies 120, and the electrical component mounting region EMR may be a space for the electrical components described below. The battery mounting region BMR may overlap multiple battery cell assemblies 120 in the Z direction. Electrical components may be disposed on the electrical component mounting region EMR. For example, the supporter 117b or the cross beam 125b coupled to the supporter 117b may be a boundary between the battery mounting region BMR and the electrical component mounting region EMR.

[0037] The base plate 111 may include a plurality of base holes 111H. The plurality of base holes 111H may be in the electrical component mounting region EMR. The plurality of base holes 111H may be only in the electrical component mounting region EMR. Each of the plurality of base holes 111H may be spaced apart from the battery mounting region BMR. The portion of the base plate 111 in the battery mounting region BMR may not include a base hole 111H. Each of the plurality of base holes 111H may be spaced apart from the plurality of battery cell assemblies 120. Each of the plurality of base holes 111H may not overlap with the plurality of battery cell assemblies 120 in the Z direction.

[0038] As a non-limiting example, the shape of each of the plurality of base holes 111H may include a square. The length of each of the plurality of base holes 111H in the Y direction may be different from the length of each of the plurality of base holes 111H in the X direction. The length of each of the plurality of base holes 111H in the Y direction may be longer than the length of each of the plurality of base holes 111H in the X direction. However, without being limited thereto, the shape of each of the plurality of base holes 111H may include various shapes such as a square, a circle, a triangle, a polygon, a star, a cross, etc.

[0039] The plurality of base holes 111H may be arranged asymmetrically. The plurality of base holes 111H may be arranged asymmetrically with respect to a center line of the base plate 111 parallel to the X direction. The number of base holes 111H interposed between the center line of the base plate 111 parallel to the X direction and the side wall 112 may be different from the number of base holes 111H interposed between the center line of the base plate 111 parallel to the X direction and the side wall 113. The number of base holes 111H interposed between the center line of the base plate 111 parallel to the X direction and the side wall 112 may be even smaller than the number of base holes 111H interposed between the center line of the base plate 111 parallel to the X direction and the side wall 113.

[0040] The side walls 112, 113, 114, and 115 may be coupled to the base plate 111. The side walls 112, 113, 114, and 115 may be welded to the base plate 111. The side walls 112, 113, 114, and 115 may extend in the Z direction. The side walls 112, 113, 114, and 115 may include an internal empty space, thereby reducing the weight of the side walls 112, 113, 114, and 115. The side walls 112 and 113 may be substantially perpendicular to the X direction, and the side walls 114 and 115 may be substantially perpendicular to the Y direction.

[0041] The plurality of battery cell assemblies 120 may be disposed on a base plate 111 of the housing 110. The base plate 111 may support the plurality of battery cell assemblies 120. The side walls 112, 113, 114, and 115 may surround the plurality of battery cell assemblies 120 horizontally.

[0042] Each of the plurality of battery cell assemblies 120 may include a cell stack 121 , cross beams 125 a , 125 b , a fireproof sheet 128 , and an upper cover 129 .

[0043] According to an exemplary embodiment, the cell stack 121 may include a plurality of battery cells and a plurality of separators. Each of the plurality of battery cells may include an electrode assembly, an electrolyte, and a case. Each of the plurality of battery cells may be a pouch-type battery cell.

[0044] The electrode assembly may include a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes. The electrode assembly may be of a jelly roll type or a stack type. A jelly roll type electrode assembly may include a rolled structure of a positive electrode, a negative electrode, and a separator interposed therebetween. A stack type electrode assembly may include a plurality of positive electrodes, a plurality of negative electrodes, and a plurality of separators interposed therebetween, stacked in sequence. A case may cover the electrode assembly. The electrode assembly may be housed in the case. The case may be, for example, a pouch case. The case may include, for example, an aluminum laminate sheet. An electrolyte may be injected into the case.

[0045] The plurality of battery cells may constitute a plurality of banks. The plurality of banks may include sets of battery cells connected in parallel to each other. The plurality of banks may be connected in series to each other. The current output by the cell stack 121 may be determined by the number of battery cells in each of the plurality of banks, and the voltage output by the cell stack 121 may be determined by the number of the plurality of banks.

[0046] According to an exemplary embodiment, each of the plurality of battery cell assemblies 120 may further include a plurality of separators interposed between the plurality of pouch-type battery cells. The separators may prevent swelling of the plurality of pouch-type battery cells by supporting the plurality of pouch-type battery cells horizontally.

[0047] According to exemplary embodiments, the plurality of separators may be thermal barriers. According to exemplary embodiments, each of the plurality of separators may have a high melting temperature and a low thermal conductivity. According to exemplary embodiments, each of the plurality of separators may include a fire-retardant material, such as ceramic and coated fiberglass. According to exemplary embodiments, each of the plurality of separators may also be configured to release a fire retardant material and a fire extinguishing agent in the event of a thermal runaway event.

[0048] The cross beams 125a and 125b of the battery cell assembly 120 may be spaced apart from each other with the cell stack 121 therebetween. The cross beams 125a and 125b may horizontally cover the cell stack 121. The cross beams 125a and 125b may be fixed to the cell stack 121 by an adhesive or the like.

[0049] According to an exemplary embodiment, the cross beams 125a and 125b may have different and complementary shapes. For example, each cross beam 125b of a battery cell assembly 120 may be coupled to the cross beam 125a of a subsequent one of the battery cell assemblies 120. The coupled cross beams 125a and 125b may constitute a cross beam assembly CBA. The cross beams 125a and 125b of the cross beam assembly CBA may interlock with each other. The cross beam 125a adjacent to the side wall 115 may be coupled to a support 117a on the base plate 111. The support 117b may be coupled to the cross beam 125b adjacent to the side wall 114.

[0050] A fireproof sheet 128 can be placed on the cell stack. An upper cover 129 can be placed on the fireproof sheet 128. The fireproof sheet 128 can be interposed between the cell stack 121 and the upper cover 129. The upper cover 129 can have higher rigidity than the fireproof sheet 128 and can be configured to protect the cell stack 121.

[0051] The fire-resistant sheet 128 may include a fire-resistant material such as mica. The fire-resistant sheet 128 may include a plurality of tear-off guides 128G. Each of the plurality of tear-off guides 128G may overlap a corresponding one of the exhaust holes 129H of the upper cover 129 in the Z direction. The plurality of tear-off guides 128G may be formed by non-cutting the fire-resistant sheet 128 using, for example, a knife. When a thermal runaway event occurs in the cell stack 121, the portion of the fire-resistant sheet 128 on which the plurality of tear-off guides 128G are formed can be easily torn, thereby allowing high-temperature gas generated from the cell stack 121 to be discharged through the exhaust holes 129H.

[0052] According to an exemplary embodiment, the battery pack 100 may further include a center beam. The center beam may be substantially parallel to the X direction. The center beam may separate the battery cell assemblies 120 adjacent to the sidewall 112 from the battery cell assemblies 120 adjacent to the sidewall 113.

[0053] The plurality of exhaust devices 140 can be coupled to the base plate 111. The plurality of exhaust devices 140 can be coupled to the base plate 111 by a plurality of exhaust device brackets 130. The plurality of exhaust device brackets 130 can be coupled to the base plate 111, and the plurality of exhaust devices 140 can be coupled to the plurality of exhaust device brackets 130. The plurality of exhaust device brackets 130 can be fixed to the base plate 111, and the plurality of exhaust devices 140 can be fixed to the plurality of exhaust device brackets 130.

[0054] Each of the exhaust device brackets 130 may be coupled to the upper surface 111U of the base plate 111. Each of the exhaust device brackets 130 may contact the upper surface 111U of the base plate 111. As a result, the exhaust device brackets 130 and the exhaust devices 140 may be at a higher level than the lower surface 111L of the base plate 111. The exhaust devices 140 and the exhaust device brackets 130 may not protrude from the lower surface 111L of the base plate 111 to the outside of the battery pack 100. The lower surfaces 140L of the exhaust devices 140 may be between the lower surface 111L and the upper surface 111U of the base plate 111. However, the present invention is not limited thereto, and the lower surfaces 140L of the exhaust devices 140 may be between the upper surface 111U of the base plate 111 and the lead plate 150.

[0055] The plurality of exhaust devices 140 may be of a valve type (or a spring type). Each of the plurality of exhaust devices 140 may include an exhaust hole 140H. The exhaust hole 140H may be closed in a normal state. If a thermal runaway event occurs in one of the plurality of battery cell assemblies 120, the pressure inside the battery pack 100 may increase, and the exhaust hole 140H of the plurality of exhaust devices 140 may be opened. As a result, high-temperature gas inside the battery pack 100 may be discharged to the outside of the battery pack 100 through the exhaust device 140.

[0056] According to an exemplary embodiment, the exhaust hole 140H of each of the plurality of exhaust devices 140 may have a different shape from the base holes 111H. By way of non-limiting example, the shape of the exhaust hole 140H of each of the plurality of exhaust devices 140 may be circular, and the shape of each of the base holes 111H may be square. The shape of each of the exhaust holes 140H of each of the plurality of exhaust devices 140 may also include various shapes such as a square, circle, triangle, polygon, star, cross, etc.

[0057] According to an exemplary embodiment, the width (or diameter) of each exhaust hole 140H of the plurality of exhaust devices 140 may be different from the width (or diameter) of each of the plurality of base holes 111H. According to an exemplary embodiment, the width (or diameter) of each exhaust hole 140H of the plurality of exhaust devices 140 may be smaller than the width (or diameter) of each of the plurality of base holes 111H. According to an exemplary embodiment, the width (or diameter) of each of the plurality of base holes 111H may be in the range of about 30 mm to about 100 mm.

[0058] According to an exemplary embodiment, the plurality of exhaust devices 140 may be coupled to the plurality of base holes 111H, meaning that in a thermal runaway event, the open exhaust hole 140H of each of the plurality of exhaust devices 140 is coupled to a corresponding one of the plurality of base holes 111H.

[0059] Each of the base holes 111H can overlap in the Z direction with multiple (i.e., two or more) exhaust devices 140. Each of the base holes 111H can be connected to multiple (i.e., two or more) exhaust devices 140. That is, according to an exemplary embodiment, multiple (i.e., two or more) exhaust devices 140 can be connected to one of the base holes 111H.

[0060] When a thermal runaway event occurs in the battery pack 100, the exhaust holes 140H of each of the exhaust devices 140 and the base holes 111H can provide a path for releasing high-temperature gas inside the battery pack 100 to the outside, thereby slowing down thermal propagation and improving the stability of the battery pack 100.

[0061] Here, thermal runaway of the battery pack 100 is a state in which the temperature change of the battery cell assemblies 120 accelerates the temperature change, which is an uncontrollable positive feedback. The battery cell assemblies 120 in the thermal runaway state exhibit a rapid temperature rise and emit a large amount of high-pressure gas and combustion debris.

[0062] The plurality of exhaust devices 140 can isolate the inside and outside of the battery pack 100 when the battery pack 100 is in a normal state. When a thermal runaway event occurs in the battery pack 100, the plurality of exhaust devices 140 can provide a path for releasing high-temperature gas to the outside by opening the plurality of exhaust holes.

[0063] The plurality of exhaust devices 140 may be disposed on the electrical component mounting region EMR. The plurality of exhaust devices 140 may be spaced apart from the battery mounting region BMR. The plurality of exhaust devices 140 may be spaced apart from the plurality of battery cell assemblies 120. The plurality of exhaust devices 140 may not be disposed on the battery mounting region BMR. The plurality of exhaust devices 140 may be disposed only on the electrical component mounting region EMR.

[0064] 1, the plurality of battery cell assemblies 120 are arranged in two rows and three columns. This means that the plurality of battery cell assemblies 120 are arranged in a 3*2 array. Based on what is described herein, a person skilled in the art can easily arrive at a battery pack including a plurality of battery cell assemblies 120 arranged in an M*N array, where M and N are each any integer greater than or equal to 1.

[0065] The lead plate 150 may be coupled to the side walls 112, 113, 114, and 115. The lead plate 150 may cover elements disposed inside the battery pack 100, such as the battery cell assembly 120 and electrical components. The lead plate 150 may be fixed to the side walls 112, 113, 114, and 115 by mechanical means, such as bolts.

[0066] The battery pack 100 may further include an interconnector that connects adjacent battery cell assemblies 120. This allows a plurality of battery cell assemblies 120 to be connected in series, and the battery pack 100 may output a high voltage.

[0067] The battery pack 100 may further include electrical components. The electrical components may include any electronic elements necessary to drive the battery pack. The electrical components may be disposed on the electrical component mounting region EMR.

[0068] The electrical components may include, for example, a BMS (Battery Management System). The BMS may be configured to monitor, balance, and control the battery pack. Monitoring the battery pack 100 may include measuring the voltage and current of specific nodes within the multiple battery cell assemblies 120 and measuring the temperature at a set position within the battery pack 100. The battery pack 100 may include measuring instruments for measuring the voltage, current, and temperature described above.

[0069] Balancing the battery pack 100 is an operation to reduce the deviation between the multiple battery cell assemblies 120. Controlling the battery pack 100 includes preventing overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack 100 can operate under optimal conditions, thereby preventing a shortening of the lifespan of each of the multiple battery cell assemblies 120.

[0070] The electrical components may further include a cooling device, a power relay assembly (PRA), a safety plug, etc. The cooling device may include a cooling fan. The cooling fan circulates air inside the battery pack 100 to prevent overheating of each of the plurality of battery cell assemblies 120. The PRA may be configured to supply or cut off power from the high-voltage battery to an external load (e.g., a vehicle motor). The PRA can protect the plurality of battery cell assemblies 120 and the external load (e.g., a vehicle motor) by cutting off the power supply to the external load (e.g., a vehicle motor) in the event of an abnormal voltage such as a voltage surge.

[0071] (Second embodiment) FIG. 4 shows a vehicle 10 including the battery pack 100 of FIG.

[0072] 2 and 4 , the vehicle 10 may include a battery pack 100. The vehicle 10 may include a vehicle body that houses the battery pack 100. The vehicle 10 may be a battery electric vehicle (BEV) or a hybrid electric vehicle (HEV). The vehicle 10 may be powered by electric energy stored in the battery pack 100. The vehicle 10 is not limited to a passenger car, and may be, for example, a truck, an electric scooter, an electric wheelchair, or an electric motorcycle. According to an exemplary embodiment, the vehicle 10 may further include an on-board charger (OBC), an electric power control unit (EPCU), a drive motor, and a reducer.

[0073] According to an exemplary embodiment, exhaust device 140 of battery pack 100 is coupled to base plate 111 so that in the event of a thermal runaway, gases exhausted from battery pack 100 are directed downward (e.g., to the ground). This can prevent the body of vehicle 10 from reacting with and being damaged by the hot gases, and can improve the safety of vehicle 10 by mitigating or preventing passenger exposure to the hot gases.

[0074] (Third embodiment) FIG. 5 is a perspective view showing a battery pack 101 according to another exemplary embodiment.

[0075] Referring to FIG. 5 , the battery pack 101 may include a housing 110 , a plurality of battery cell assemblies 120 , a plurality of exhaust device brackets 131 , a plurality of exhaust devices 141 , and a lead plate 150 .

[0076] The housing 110, the plurality of battery cell assemblies 120, and the lead plate 150 are substantially the same as those described with reference to FIGS. 1 to 3, and therefore, a duplicate description thereof will be omitted.

[0077] According to an exemplary embodiment, the plurality of exhaust devices 141 may be rupture disks. In the event of a thermal runaway event, high pressure within the battery pack 100 may cause one or more of the plurality of exhaust devices 141 to rupture, thereby providing a path for gas within the battery pack 101 to be vented.

[0078] The plurality of exhaust devices 141 may be fixed by a plurality of exhaust device brackets 131. The plurality of exhaust devices 141 may be coupled to the base plate 111 by a plurality of exhaust device brackets 131. According to an exemplary embodiment, the shape of the base hole 111H (see FIG. 3 ) of the base plate 111 may be square, and the shape of the plurality of exhaust devices 141 may also be square. The shape of the openings formed by breaking the plurality of exhaust devices 141 may also be square, but is not limited thereto.

[0079] Each of the plurality of exhaust devices 141 may be substantially rectangular. The length of each of the plurality of exhaust devices 141 in the Y direction may be different from the length of each of the plurality of exhaust devices 141 in the X direction. The length of each of the plurality of exhaust devices 141 in the Y direction may be longer than the length of each of the plurality of exhaust devices 141 in the X direction.

[0080] The present invention has been described in more detail above through the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, and therefore, there may be various equivalents and modifications that can replace them at the time of filing this application. [Explanation of symbols]

[0081] 10 vehicles 100 battery packs 101 Battery Pack 110 Housing 111 Base Plate 111H Base Hall 111L bottom surface 111U top 112 Side wall 113 Side wall 114 Side wall 115 Side wall 117a Supporter 117b Supporter 120 Battery Cell Assembly 121 Cell Stack 125a cross beam 125b cross beam 128 Fireproof Sheet 128G Cutting guide 129 Top Cover 129H Exhaust hole 130 Exhaust system bracket 131 Exhaust system bracket 140 Exhaust system 140H Exhaust hole 140L bottom 141 Exhaust system 150 Reed Plate BMR battery mounting area CBA Cross beam assembly EMR Electrical component mounting area

Claims

1. a housing including a base plate and a sidewall coupled to the base plate; a plurality of battery cell assemblies disposed on an upper surface of the base plate; a plurality of exhaust devices coupled to the base plate.

2. The battery pack according to claim 1 , wherein each of the plurality of exhaust devices is a valve type.

3. 2. The battery pack according to claim 1, wherein each of the plurality of exhaust devices is a rupture disk.

4. The battery pack according to claim 1 , wherein the base plate includes a plurality of base holes coupled to the plurality of exhaust devices.

5. The battery pack according to claim 4 , wherein each of the plurality of exhaust devices includes an exhaust hole connected to a corresponding one of the plurality of base holes.

6. 6. The battery pack according to claim 5, wherein the width of each of the plurality of base holes is in the range of 30 mm to 100 mm.

7. The battery pack according to claim 5 , wherein a width of the exhaust hole of each of the plurality of exhaust devices is smaller than a width of each of the plurality of base holes.

8. The battery pack according to claim 5 , wherein a shape of the exhaust hole of each of the plurality of exhaust devices is different from a shape of the plurality of base holes.

9. each of the plurality of base holes has a square shape; The battery pack according to claim 5 , wherein the cross-sectional shape of the exhaust hole of each of the plurality of exhaust devices is circular.

10. The battery pack according to claim 4 , wherein each of the base holes is connected to two or more of the plurality of exhaust devices.

11. The battery pack according to claim 1 , wherein the plurality of exhaust devices are arranged asymmetrically.

12. The battery pack of claim 1 , further comprising a plurality of exhaust device brackets that secure the plurality of exhaust devices to the base plate.

13. The battery pack of claim 12 , wherein the exhaust bracket abuts the top surface of the base plate.

14. the base plate includes an electrical component mounting area in which a plurality of electrical components are arranged, and a battery mounting area overlapping the plurality of battery cell assemblies; The battery pack according to claim 1 , wherein the plurality of exhaust devices are arranged in the electrical component mounting area.

15. The battery pack according to claim 1 , wherein each of the plurality of exhaust devices is spaced apart from the plurality of battery cell assemblies.

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