Battery pack

Abstract

According to an exemplary embodiment of the present invention, a battery pack is provided. The battery pack includes: a housing including a bottom plate and side walls coupled to the bottom plate; the plurality of battery cell assemblies are arranged on the upper surface of the bottom 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 priority based on Korean Patent Application No. 10-2023-0088276 filed on Jul. 7, 2023, and the entire contents of the Korean Patent Application are incorporated herein by reference. Background Art

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries have been widely used as energy sources for various types of wireless devices (such as handheld devices, laptop computers, and cordless vacuum cleaners). Recently, as the manufacturing cost per unit capacity of secondary batteries has been significantly reduced due to improved energy density and economies of scale, and the range of battery electric vehicles (BEVs) has increased to the same level as fuel vehicles, the main application of secondary batteries has evolved from mobile devices to travel devices.

[0003] The safety of secondary batteries is directly related to the lives of occupants in vehicles, so a key task in the technical development of secondary batteries used in vehicles is to improve the safety of secondary batteries. In order to improve the safety of secondary batteries, the design of an efficient exhaust path for high-temperature gases in secondary batteries is very important. Summary of the invention

[0004] Technical issues

[0005] The present invention is directed to providing a battery pack with improved safety.

[0006] Technical Solution

[0007] An exemplary embodiment of the present invention provides a battery pack. The battery pack includes: a housing having a bottom plate and a side wall coupled to the bottom plate; a plurality of battery cell assemblies on an upper surface of the bottom plate; and a plurality of exhaust devices coupled to the bottom plate.

[0008] Each of the plurality of exhaust devices may be of a valve type.

[0009] Each of the plurality of exhaust devices may be a burst disc.

[0010] The bottom plate may include a plurality of base apertures connected to the plurality of exhaust devices.

[0011] Each of the plurality of exhaust devices may include an exhaust hole connected to a corresponding base hole of the plurality of base holes.

[0012] Each of the plurality of exhaust devices includes an exhaust hole connected to a corresponding base hole of the plurality of base holes.

[0013] The width of each of the plurality of base holes may be in the range of 30 mm to 100 mm.

[0014] The width of the exhaust aperture of each of the plurality of exhaust devices may be smaller than the width of each of the plurality of base apertures.

[0015] The shape of the exhaust aperture of each of the plurality of exhaust devices may be different than the shape of each of the plurality of base apertures.

[0016] Each of the plurality of base holes may have a quadrilateral shape, and a cross-section of the exhaust hole of each of the plurality of exhaust devices may have a circular shape.

[0017] Each of the base apertures may be connected to two or more of the plurality of exhaust devices.

[0018] Multiple exhaust devices may be arranged asymmetrically.

[0019] The battery pack may further include a plurality of exhaust device brackets configured to secure the plurality of exhaust devices to the base plate.

[0020] The exhaust device bracket may contact the upper surface of the base plate.

[0021] The bottom plate may include an electronic component mounting area on which a plurality of electronic components are disposed and a battery mounting area overlapping with the plurality of battery cell assemblies.

[0022] Multiple exhaust devices may be provided over the electronic component mounting area.

[0023] Each of the plurality of vents may be spaced apart from the plurality of battery cell assemblies.

[0024] Beneficial Effects

[0025] The battery cell assembly according to an exemplary embodiment of the present invention includes an exhaust device coupled to the bottom plate of the housing. Therefore, when a thermal runaway event occurs, high-temperature gas can be efficiently exhausted, and the safety of the battery pack can be improved.

[0026] The effects that can be achieved from the exemplary embodiments of the present invention are not limited to the above effects, and other effects not described herein will be clearly derived and understood from the following description by those of ordinary skill in the art to which the exemplary embodiments of the present invention belong. That is, those of ordinary skill in the art can derive from the exemplary embodiments of the present invention the unexpected effects that are achieved when implementing the exemplary embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a plan view for describing a battery pack according to example embodiments.

[0028] Figure 2 It is along Figure 1A cross-sectional view taken along line AA'.

[0029] Figure 3 yes Figure 2 An enlarged partial cross-sectional view of a portion of .

[0030] Figure 4 Shown include Figure 1 The battery pack of the vehicle.

[0031] Figure 5 is a plan view of an exhaust device according to other example embodiments. DETAILED DESCRIPTION

[0032] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before describing the embodiments of the present invention, the terms or expressions used in this specification and claims should not be interpreted as limited to the commonly understood meanings or the meanings defined in the commonly used dictionaries, and should be understood based on the meanings and concepts corresponding to the present invention, based on the inventor of the present application can appropriately define the terms or expressions to best explain the principles of the present invention.

[0033] Therefore, the embodiments described herein and the configurations shown in the drawings are merely examples of the present invention and do not reflect all technical concepts of the present invention, and it should be understood that various equivalents and modifications of alternative configurations have been made on the filing date of the present application.

[0034] When it is determined that a well-known configuration or function related to describing the present invention would obscure the subject matter of the present invention due to unnecessary detail, it is not described in detail.

[0035] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes, sizes, etc. of the components shown in the drawings may be exaggerated, omitted, or schematically illustrated for clarity. Therefore, it should not be understood that the sizes or ratios of the components fully reflect their actual sizes or ratios.

[0036] (First Embodiment)

[0037] Figure 1 is a plan view for describing a battery pack according to example embodiments.

[0038] Figure 2 It is along Figure 1 A cross-sectional view taken along line AA'.

[0039] Figure 3 yes Figure 2 An enlarged partial cross-sectional view of a portion of a POR.

[0040] Reference Figures 1 to 3The 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 a final form of a battery system mounted on a travel device or the like.

[0041] The housing 110 may provide a space for arranging a plurality of battery cell assemblies 120 therein. The housing 110 may include a bottom plate 111 and side walls 112, 113, 114, and 115.

[0042] Two directions substantially parallel to the upper surface 111U of the bottom plate 111 are defined as an X-axis direction and a Y-axis direction, and a direction substantially perpendicular to the upper surface 111U of the bottom plate 111 is defined as a Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction may be substantially perpendicular to each other. Unless otherwise specified, the definition of the direction will apply to subsequent drawings.

[0043] The bottom plate 111 may include a plurality of plates coupled to each other by friction stir welding. The bottom plate 111 may include a plurality of cooling channels as flow paths for a cooling fluid. The bottom plate 111 may include a plurality of cavities, thereby achieving a reduction in weight of the bottom plate 111. Each of the plurality of cooling channels and the plurality of cavities may extend in the X-axis direction.

[0044] The base plate 111 may include a battery mounting region BMR and an electronic component mounting region EMR. The battery mounting region BMR and the electronic component mounting region EMR may be different regions from each other. The base plate 111 may be divided by the battery mounting region BMR and the electronic component mounting region EMR. The battery mounting region BMR may be a space for a battery cell assembly 120, and the electronic component mounting region EMR may be a space for electronic components to be described below. The battery mounting region BMR may overlap with a plurality of battery cell assemblies 120 in the Z-axis direction. Electronic components may be on the electronic component mounting region ERM. For example, the support member 117b or the beam 125b coupled to the support member 117b may be a boundary between the battery mounting region BMR and the electronic component mounting region EMR.

[0045] The bottom plate 111 may include a plurality of base holes 111H. The plurality of base holes 111H may be in the electronic component mounting region EMR. The plurality of base holes 111H may be only in the electronic 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 battery mounting region BMR of the bottom plate 111 may not include the 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-axis direction.

[0046] As a non-limiting example, each of the plurality of base holes 111H may have a quadrilateral shape. The length of each of the plurality of base holes 111H in the Y-axis direction may be different from the length of each of the plurality of base holes 111H in the X-axis direction. The length of each of the plurality of base holes 111H in the Y-axis direction may be greater than the length of each of the plurality of base holes 111H in the X-axis direction. However, the present invention is not limited thereto, and each of the plurality of base holes 111H may include various shapes, such as a square shape, a circular shape, a triangular shape, a polygonal shape, a star shape, and a cross shape.

[0047] The plurality of base holes 111H may be arranged asymmetrically. The plurality of base holes 111H may be arranged asymmetrically with respect to the center line of the bottom plate 111 parallel to the X-axis direction. The number of exhaust holes 111H between the center line of the bottom plate 111 parallel to the X-axis direction and the side wall 112 may be different from the number of exhaust holes 111H between the center line of the bottom plate 111 parallel to the X-axis direction and the side wall 113. The number of exhaust holes 111H between the center line of the bottom plate 111 parallel to the X-axis direction and the side wall 112 may be less than the number of exhaust holes 111H between the center line of the bottom plate 111 parallel to the X-axis direction and the side wall 113.

[0048] The side walls 112, 113, 114, and 115 may be coupled to the bottom plate 111. The side walls 112, 113, 114, and 115 may be welded to the bottom plate 111. The side walls 112, 113, 114, and 115 may extend in the Z-axis direction. The side walls 112, 113, 114, and 115 may include an empty inner space, and thus their weight may be reduced. The side walls 112 and 113 may be substantially perpendicular to the X-axis direction, and the side walls 114 and 115 may be substantially perpendicular to the Y-axis direction.

[0049] The plurality of battery cell assemblies 120 may be on the bottom plate 111 of the housing 110. The bottom plate 111 may support the plurality of battery cell assemblies 120. The side walls 112, 113, 114, and 115 may horizontally surround the plurality of battery cell assemblies 120.

[0050] Each of the plurality of battery cell assemblies 120 may include a cell stack 121 , cross beams 125 a and 125 b , a fireproof sheet 128 , and an upper cover 129 .

[0051] According to example embodiments, 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.

[0052] The electrode assembly may include a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. The electrode assembly may be a cake roll type electrode assembly or a stacked type electrode assembly. The cake roll type electrode assembly may include a structure in which the positive electrode, the negative electrode, and the separator interposed therebetween are wound together. The stacked type electrode assembly may include a plurality of positive electrodes and a plurality of negative electrodes stacked in sequence, and a plurality of separators therebetween. The housing may cover the electrode assembly. The electrode assembly may be embedded in the housing. The housing may be, for example, a bag-shaped housing. The housing may include, for example, an aluminum laminate. The electrolyte may be injected into the housing.

[0053] The plurality of battery cells may form a plurality of groups. The plurality of groups may include a group of battery cells connected in parallel to each other. The plurality of groups may be connected in series to each other. The current to be output by the battery stack 121 may be determined by the number of battery cells in each of the plurality of groups, and the voltage to be output by the battery stack 121 may be determined by the number of the plurality of groups.

[0054] According to example embodiments, each of the plurality of battery cell assemblies 120 may further include a plurality of separators between the plurality of pouch type battery cells. The plurality of separators horizontally support the plurality of pouch type battery cells to prevent expansion of the plurality of pouch type battery cells.

[0055] According to example embodiments, the plurality of dividers may be thermal barriers. According to example embodiments, each of the plurality of dividers may have a high melting temperature and low thermal conductivity. According to example embodiments, each of the plurality of dividers may include a flame retardant material, such as ceramic and coated fiberglass. According to example embodiments, each of the plurality of dividers may be configured to emit a flame retardant material and a fire extinguishing agent when a thermal runaway event occurs.

[0056] The cross beams 125a and 125b of each of the plurality of battery cell assemblies 120 may be spaced apart from each other with the cell stack 121 interposed 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 via an adhesive material or the like.

[0057] According to example embodiments, the cross beam 125a and the cross beam 125b may be different from each other and have complementary shapes. For example, the cross beam 125b of each of the battery cell assemblies 120 may be coupled to the cross beam 125a of the subsequent battery cell assembly 120 in the battery cell assembly 120. The cross beams 125a and the cross beams 125b coupled to each other may form a cross beam assembly CBA together. The cross beams 125a and the cross beams 125b of each cross beam assembly CBA may be engaged with each other. The cross beam 125a adjacent to the side wall 115 may be coupled to the support 117a on the bottom plate 111. The support 117b may be coupled to the cross beam 125b adjacent to the side wall 114.

[0058] The refractory sheet 128 may be on the battery cell stack 121. The upper cover 129 may be on the refractory sheet 128. The refractory sheet 128 may be interposed between the battery cell stack 121 and the upper cover 129. The upper cover 129 may have higher rigidity than the refractory sheet 128 and is configured to protect the battery cell stack 121.

[0059] The refractory sheet 128 may, for example, include a refractory material such as mica. The refractory sheet 128 may include a plurality of cutting guides 128G. Each of the plurality of cutting guides 128G may overlap with a corresponding exhaust hole in the exhaust hole 129H of the upper cover 129 in the Z-axis direction. The plurality of cutting guides 128G may be formed by, for example, performing a non-cutting treatment on the refractory sheet 128 using a knife or the like. When a thermal runaway event occurs in the battery cell stack 121, the portion of the refractory sheet 128 on which the plurality of cutting guides 128G are formed may be easily broken, and therefore, the high temperature gas generated from the battery cell stack 121 may be discharged through the exhaust hole 129H.

[0060] According to an example embodiment, the battery pack 100 may further include a middle beam. The middle beam may be substantially parallel to the X-axis direction. The middle beam may isolate the battery cell assembly 120 adjacent to the side wall 112 from the battery cell assembly 120 adjacent to the side wall 113.

[0061] A plurality of exhaust devices 140 may be coupled to the bottom plate 111. The plurality of exhaust devices 140 may be coupled to the bottom plate 111 through a plurality of exhaust device brackets 130. A plurality of exhaust device brackets 130 may be coupled to the bottom plate 111, and the plurality of exhaust devices 140 may be coupled to the plurality of exhaust device brackets 130. A plurality of exhaust device brackets 130 may be fixed to the bottom plate 111, and the plurality of exhaust devices 140 may be fixed to the plurality of exhaust device brackets 130.

[0062] Each of the plurality of exhaust device brackets 130 may be coupled to the upper surface 111U of the bottom plate 111. Each of the plurality of exhaust device brackets 130 may be in contact with the upper surface 111U of the bottom plate 111. Therefore, the plurality of exhaust device brackets 130 and the plurality of exhaust devices 140 may be located at a higher level than the lower surface 111L of the bottom plate 111. The plurality of exhaust devices 140 and the plurality of exhaust device brackets 130 may not protrude from the lower surface 111L of the bottom plate 111 to the outside of the battery pack 100. The lower surface 140L of the plurality of exhaust devices 140 may be between the lower surface 111L and the upper surface 111U of the bottom plate 111. However, the present invention is not limited thereto, and the lower surface 140L of the plurality of exhaust devices 140 may be between the upper surface 111U of the bottom plate 111 and the lead plate 150.

[0063] The plurality of exhaust devices 140 may be of valve type (or spring type). Each of the plurality of exhaust devices 140 may include an exhaust hole 140H. The exhaust hole 140H may be closed under normal conditions. When a thermal runaway event occurs in one of the plurality of battery cell assemblies 120, the internal pressure of the battery pack 100 may increase, and the exhaust holes 140H of the plurality of exhaust devices 140 may be opened. Therefore, high temperature gas may be discharged from the inside of the battery pack 100 to the outside of the battery pack 100 through the exhaust device 140.

[0064] According to example embodiments, the exhaust hole 140H of each of the plurality of exhaust devices 140 may have a shape different from that of each of the plurality of base holes 111H. As a non-limiting example, the exhaust hole 140H of each of the plurality of exhaust devices 140 may have a circular shape, and each of the plurality of base holes 111H may have a quadrilateral shape. The exhaust hole 140H of each of the plurality of exhaust devices 140 may have various shapes, such as a square shape, a circular shape, a triangular shape, a polygonal shape, a star shape, and a cross shape.

[0065] According to example embodiments, the width (or diameter) of the exhaust hole 140H of each 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 example embodiments, the width (or diameter) of the exhaust hole 140H of each 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 example embodiments, the width (or diameter) of each of the plurality of base holes 111H may be in a range of about 30 mm to about 100 mm.

[0066] According to an example embodiment, the plurality of exhaust devices 140 may be connected to the plurality of base holes 111H. The connection of the plurality of exhaust devices 140 to the plurality of base holes 111H may be understood to mean that when a thermal runaway event occurs, the opened exhaust hole 140H of each of the plurality of exhaust devices 140 is connected to a corresponding base hole of the plurality of base holes 111H.

[0067] Each of the base holes 111H may overlap with a plurality of exhaust devices 140 (i.e., two or more exhaust devices 140) in the Z-axis direction. Each of the base holes 111H may be connected to a plurality of exhaust devices 140 (i.e., two or more exhaust devices 140). That is, according to example embodiments, a plurality of exhaust devices 140 (i.e., two or more exhaust devices 140) may be connected to one of the base holes 111H.

[0068] When a thermal runaway event occurs in the battery pack 100, the exhaust holes 140H and the base holes 111H of each of the plurality of exhaust devices 140 may provide a path for discharging high temperature gas from the inside to the outside of the battery pack 100. Therefore, heat propagation may be delayed and the stability of the battery pack 100 may be improved.

[0069] Here, the thermal runaway that occurs in the battery pack 100 is a state in which the temperature change of the plurality of battery cell assemblies 120 accelerates the temperature change (ie, uncontrollable positive feedback). The temperature of the plurality of battery cell assemblies 120 in the thermal runaway state increases sharply, and a large amount of high-pressure gas and combustion debris are discharged.

[0070] When the battery pack 100 is in a normal state, the plurality of exhaust devices 140 may isolate the inside of the battery pack 100 from the outside. When a thermal runaway event occurs in the battery pack 100, the plurality of exhaust devices 140 may open the plurality of exhaust holes 140H to provide a path for discharging high temperature gas to the outside.

[0071] A plurality of exhaust devices 140 may be on the electronic component mounting region EMR. A plurality of exhaust devices 140 may be spaced apart from the battery mounting region BMR. A plurality of exhaust devices 140 may be spaced apart from the plurality of battery cell assemblies 120. A plurality of exhaust devices 140 may not be on the battery mounting region BMR. A plurality of exhaust devices 140 may be only on the electronic component mounting region EMR.

[0072] exist Figure 1 In the example of , the plurality of battery cell assemblies 120 are arranged in two rows and three columns. Therefore, it can be understood that the plurality of battery cell assemblies 120 are arranged in a 3×2 array. Based on the above description, a person of ordinary skill in the art will easily derive a battery pack including a plurality of battery cell assemblies 120 arranged in an M×N array. Here, M and N are both integers of 1 or greater.

[0073] Lead plate 150 may be coupled to side walls 112, 113, 114, and 115. Lead plate 150 may cover elements inside battery pack 100, such as battery cell assembly 120 and electronic components. Lead plate 150 may be fixed to side walls 112, 113, 114, and 115 by mechanical means such as bolts.

[0074] The battery pack 100 may further include an interconnector that connects adjacent battery cell assemblies 120 to each other. Therefore, a plurality of battery cell assemblies 120 may be connected in series, and the battery pack 100 may output a high voltage.

[0075] The battery pack 100 may further include electronic components. The electronic components may include electronic devices required to drive the battery pack 100. The electronic components may be on the electronic component mounting region EMR.

[0076] The electronic components may include, for example, a battery management system (BMS). The BMS may be configured to monitor, balance, and control the battery pack 100. Monitoring of the battery pack 100 may include measuring voltage and current at certain nodes within the plurality of battery cell assemblies 120 and measuring temperature at set locations in the battery pack 100. The battery pack 100 may include measurement devices for measuring voltage, current, and temperature as described above.

[0077] The balancing of the battery pack 100 is an operation to reduce the deviation between the plurality of battery cell assemblies 120. The control of the battery pack 100 includes preventing overcharge, overdischarge and overcurrent. Through monitoring, balancing and control, the battery pack 100 can operate under optimal conditions, thereby preventing the life of each of the plurality of battery cell assemblies 120 from being shortened.

[0078] The electronic components may also include a cooling device, a power relay assembly (PRA), a safety plug, etc. The cooling device may include a cooling fan. The cooling fan may circulate air in the battery pack 100 to prevent each of the multiple battery cell assemblies 120 from overheating. The PRA may be configured to supply power to or cut off power from the high-voltage battery to an external load (e.g., a motor of a vehicle). When an abnormal voltage such as a voltage surge occurs, the PRA may cut off the power supply to the external load (e.g., a motor of a vehicle) to protect the multiple battery cell assemblies 120 and the external load (e.g., a motor of a vehicle).

[0079] (Second Embodiment)

[0080] Figure 4 Shown include Figure 1 A battery pack 100 of a vehicle 10 is provided.

[0081] refer to Figure 2 and Figure 4 , the vehicle 10 may include a battery pack 100. The vehicle 10 may include a body configured to accommodate 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 driven 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 bicycle. According to an example embodiment, the vehicle 10 may further include an on-board charger (OBC), an electric power control unit (EPCU), a drive motor, and a reducer.

[0082] According to an example embodiment, the exhaust device 140 of the battery pack 100 is coupled to the floor 111, and thus the gas exhausted from the battery pack 100 in the event of thermal runaway faces downward (e.g., the ground). Therefore, it is possible to prevent the body of the vehicle 10 from being damaged due to a reaction with the high temperature gas, and to mitigate or prevent the exposure of passengers to the high temperature gas, thereby improving the safety of the vehicle 10.

[0083] (Third Embodiment)

[0084] Figure 5 is a perspective view of a battery pack 101 according to other example embodiments.

[0085] refer to Figure 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 .

[0086] The housing 110, the plurality of battery cell assemblies 120 and the lead plate 150 are similar to those in the above reference Figures 1 to 3 Those described are basically the same, so their redundant descriptions are omitted here.

[0087] According to an example embodiment, the plurality of vents 141 may be rupture discs. When a thermal runaway event occurs, one or more of the plurality of vents 141 may rupture due to the high internal pressure of the battery pack 100 and thus may provide a path for exhausting gas from inside the battery pack 101 .

[0088] The plurality of exhaust devices 141 may be fixed by the plurality of exhaust device brackets 131. The plurality of exhaust devices 141 may be coupled to the bottom plate 111 through the plurality of exhaust device brackets 131. According to an example embodiment, the base hole 111H (see FIG. 3) of the bottom plate 111 may have a quadrilateral shape, and the plurality of exhaust devices 141 may have a quadrilateral shape. The opening formed when the plurality of exhaust devices 141 are broken may also have a quadrilateral shape, but is not limited thereto.

[0089] Each of the plurality of exhaust devices 141 may have a substantially rectangular shape. The length of each of the plurality of exhaust devices 141 in the Y-axis direction may be different from the length of each of the plurality of exhaust devices 141 in the X-axis direction. The length of each of the plurality of exhaust devices 141 in the Y-axis direction may be greater than the length of each of the plurality of exhaust devices 141 in the X-axis direction.

[0090] The present invention has been described in more detail above with reference to the drawings, embodiments, etc. However, the configurations shown in the drawings or the embodiments described in this specification are merely embodiments of the present invention and do not reflect all technical concepts of the present invention, and therefore it should be understood that various equivalents and modifications of alternative configurations have been made on the filing date of this application.

Claims

1. A battery pack, comprising: a housing having a bottom plate and a side wall coupled to the bottom plate; a plurality of battery cell assemblies, the plurality of battery cell assemblies being on an upper surface of the base plate; as well as A plurality of exhaust devices are coupled to the base plate.

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

3. The battery pack according to claim 1, wherein: Each of the plurality of exhaust devices is a burst disc.

4. The battery pack according to claim 1, wherein: The bottom plate includes a plurality of base apertures connected 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 base hole of the plurality of base holes.

6. The battery pack according to claim 5, wherein: The width of each base hole 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: 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.

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

9. The battery pack according to claim 5, wherein: Each base hole of the plurality of base holes has a quadrilateral shape, and A cross section of the exhaust hole of each of the plurality of exhaust devices has a circular shape.

10. The battery pack according to claim 4, wherein: Each of the base apertures 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 configured to secure the plurality of exhaust devices to the base plate.

13. The battery pack according to claim 12, wherein: The exhaust device bracket contacts the upper surface of the bottom plate.

14. The battery pack according to claim 1, wherein: The bottom plate includes an electronic component mounting area and a battery mounting area, a plurality of electronic components are disposed on the electronic component mounting area, and the battery mounting area overlaps with the plurality of battery cell assemblies, and The plurality of exhaust devices are on the electronic component mounting area.

15. The battery pack according to claim 1, wherein: Each of the plurality of vents is spaced apart from the plurality of battery cell assemblies.

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