Battery pack

Abstract

The present invention relates to a battery pack that prevents flames generated inside from being exposed and spreading to the outside, reduces the risk of explosion inside by discharging smoke, gas, dust, etc. to the outside, and further, delays and prevents chain reaction ignition by independently suppressing flames inside, thereby improving product safety. The battery pack according to the present invention includes a plate-shaped lower case, a plurality of battery modules disposed on the lower case, an upper case having a polyhedral shape without a bottom surface and coupled to the lower case to cover the battery modules, and a flame propagation prevention unit disposed inside the upper case spaced apart from a front surface of the battery modules, which is a surface on which electrode terminals are provided, to prevent propagation of a flame generated in the battery modules, and the flame propagation prevention unit may include a barrier wall disposed apart from an inner rear surface of the upper case, and a passage wall connected at one end to the barrier wall, extending in a direction away from the barrier wall, and disposed apart from an inner surface of the upper case.

Description

[Technical field]

[0001] [CROSS REFERENCE TO RELATED APPLICATIONS] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0019796 dated February 15, 2022, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a battery pack, and more particularly to a battery pack of a secondary battery that can be charged or discharged. [Background technology]

[0003] Recently, with the rising cost of energy sources due to the depletion of fossil fuels and growing concern over environmental pollution, the demand for environmentally friendly alternative energy sources has become an essential factor for future life. Therefore, research into various power generation technologies such as solar, wind, and tidal power has been ongoing, and there has also been a great interest in power storage devices such as batteries to use the electric energy produced in this way more efficiently.

[0004] Furthermore, with the increasing technological development and demand for battery-based electronic mobile devices and electric vehicles, the demand for batteries as an energy source is rapidly increasing, and as a result, much research is being conducted into batteries that can meet various demands.

[0005] Batteries that store electrical energy can generally be classified into primary batteries and secondary batteries. Primary batteries are disposable, consumable batteries, while secondary batteries are rechargeable batteries manufactured using materials that can undergo repeated oxidation and reduction processes between electric current and materials. That is, when a reduction reaction occurs on a material due to electric current, the power source is charged, and when an oxidation reaction occurs on the material, the power source is discharged. Electricity is generated by repeating this charge-discharge process.

[0006] Meanwhile, as the need for a large capacity structure increases recently, including use as an energy storage source, the demand for a battery pack in which a number of secondary batteries or battery modules are assembled is increasing.

[0007] Since a battery pack is manufactured with a large number of battery modules packed into a small space, a large amount of heat is generated from each battery module, which may cause a fire in the battery module and may cause the fire to spread to the outside.

[0008] As a result, the need for satisfaction of the UL1973 fire resistance items and UL9540A for consumer safety has arisen.

[0009] However, in conventional battery packs, a problem occurs in that a flame that starts in an internal battery module is exposed to the outside, and as a result, there is a problem that it is not possible to prevent the flame from spreading to the outside.

[0010] To solve these problems, there is a need for a battery pack that can prevent the spread of flames by blocking the exposure of internal flames to the outside while reducing the possibility of explosion. Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been devised to solve the above problems, and an object of the present invention is to provide a battery pack that prevents a flame generated inside the battery pack from being exposed and spreading to the outside, reduces the risk of an explosion inside by discharging smoke, gas, dust, etc. to the outside, and further delays and prevents a chain reaction of fire by independently suppressing a flame inside, thereby improving product safety. [Means for solving the problem]

[0012] The battery pack according to the present invention includes a plate-shaped lower case, a plurality of battery modules disposed on the lower case, an upper case having a polyhedral shape without a bottom surface and coupled to the lower case to cover the battery modules, and a flame arrestor disposed inside the upper case spaced apart from a front surface of the battery modules, which is the surface on which electrode terminals are located, to prevent the spread of a flame generated in the battery modules. The flame arrestor may include a barrier wall disposed apart from an inner rear surface of the upper case, and a passage wall connected at one end to the barrier wall, extending in a direction away from the barrier wall, and disposed apart from an inner surface of the upper case.

[0013] The flame propagation prevention unit may further include a plurality of first protruding walls extending from the blocking wall toward the inner rear surface of the upper case so as not to touch the inner rear surface of the upper case, and a plurality of second protruding walls extending from the inner rear surface of the upper case toward the blocking wall so as not to touch the blocking wall, and the first protruding walls and the second protruding walls may be arranged alternately.

[0014] The battery pack may further include horizontal partition walls having a plate shape extending in a longitudinal direction of the battery modules and disposed between the battery modules to isolate adjacent battery modules from each other, and vertical partition walls having a plate shape extending in a width direction of the battery modules and disposed to separate a front surface of the battery module from an inner front surface of the upper case.

[0015] The battery pack may have horizontal and vertical partitions that meet vertically to each other.

[0016] The horizontal bulkheads may comprise a steel material.

[0017] The horizontal partition wall may have a heat insulating sheet attached to a surface facing the battery module.

[0018] The insulating sheet may include mica.

[0019] The upper case may have a discharge hole formed therein, the discharge hole penetrating from the inner rear surface to the outer rear surface.

[0020] The battery pack may further include a water injection system disposed penetrating from the outer front surface to the inner front surface of the upper case, and the water injection system may include a passage through which water can be injected toward the battery module inside the upper case.

[0021] The battery pack may further include a Battery Management System (BMS) disposed inside the upper case to check the status of the battery module.

[0022] The battery pack may further include a plate-shaped thermal interface material (TIM) disposed between the lower case and the battery module. Effect of the Invention

[0023] The battery pack according to the present invention includes a plate-shaped lower case, a plurality of battery modules disposed on the lower case, an upper case having a polyhedral shape without a bottom surface and coupled to the lower case to cover the battery modules, and a flame propagation prevention unit disposed inside the upper case spaced apart from a front surface of the battery modules, which is a surface on which electrode terminals are provided, to prevent propagation of a flame generated in the battery modules, and the flame propagation prevention unit may include a barrier wall disposed apart from an inner rear surface of the upper case, and a passage wall connected at one end to the barrier wall, extending in a direction away from the barrier wall, and disposed apart from an inner surface of the upper case.

[0024] This prevents flames that occur inside the battery pack from being exposed and spreading to the outside, reduces the risk of an explosion inside by discharging smoke, gas, dust, etc. to the outside, and furthermore, delays and prevents a chain reaction of ignition by independently suppressing the flame inside, thereby providing a battery pack with improved product safety. [Brief description of the drawings]

[0025] [Figure 1] 1 is a perspective view illustrating a battery pack according to an embodiment of the present invention; [Diagram 2] 1 is an exploded perspective view illustrating a battery pack according to an embodiment of the present invention; [Diagram 3] 1 is a plan view illustrating a battery pack according to an embodiment of the present invention; [Figure 4] 1 is an enlarged rear perspective view illustrating a battery pack according to an embodiment of the present invention; [Diagram 5] 2 is a perspective view illustrating a schematic upper case of a battery pack according to an embodiment of the present invention; FIG. [Figure 6] 2 is a plan view illustrating a schematic upper case of a battery pack according to an embodiment of the present invention; [Figure 7] FIG. 6 is an enlarged view of part A in FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in various different forms and is not limited to the following embodiments.

[0027] In order to clearly explain the present invention, detailed descriptions of parts that are not relevant to the explanation or related known technologies that may unnecessarily obscure the gist of the present invention will be omitted, and when adding reference symbols to components in each figure in this specification, the same or similar reference symbols will be used for the same or similar components throughout the specification.

[0028] Furthermore, the terms and words used in this specification and the claims should not be interpreted in a limited manner to their ordinary or dictionary meanings, but should be interpreted as having meanings and concepts that are consistent with the technical idea of ​​the present invention, in accordance with the principle that an inventor may appropriately define the concept of a term in order to best explain his or her invention.

[0029] Fig. 1 is a perspective view illustrating a battery pack 100 according to an embodiment of the present invention, Fig. 2 is an exploded perspective view illustrating the battery pack 100 so as to easily identify each component of the battery pack 100 according to an embodiment of the present invention, Fig. 3 is a plan view illustrating the battery pack 100 according to an embodiment of the present invention, and Fig. 4 is an enlarged rear perspective view illustrating the battery pack 100 according to an embodiment of the present invention.

[0030] Referring to Figures 1 to 4, a battery pack 100 according to one embodiment of the present invention may include a battery module 110, a lower case 120, an upper case 130, and a flame propagation prevention unit 140 to prevent a flame generated inside the battery pack 100 from propagating and spreading to the outside.

[0031] A battery pack 100 according to an embodiment of the present invention may include a battery module 110 including two secondary batteries to generate electrical energy through charging or discharging.

[0032] As an example of a configuration for arranging the battery modules 110 , the battery pack 100 according to an embodiment of the present invention may include a lower case 120 .

[0033] The battery module 110 may be disposed on the upper surface of the lower case 120. As described above, the battery pack 100 according to an embodiment of the present invention may include two battery modules 110. Thus, the two battery modules 110 are disposed parallel to each other on the upper surface of the lower case 120.

[0034] The lower case 120 may have a plate shape so that the battery module 110 can be disposed thereon. There is no limitation on the shape of the lower case 120, provided that the battery module 110 can be disposed thereon.

[0035] Fig. 5 is a perspective view illustrating an upper case 130 of a battery pack 100 according to an embodiment of the present invention, Fig. 6 is a plan view illustrating an upper case 130 of a battery pack 100 according to an embodiment of the present invention, and Fig. 7 is an enlarged view of a portion A in Fig. 5.

[0036] As an example of a configuration for preventing a fire occurring in the battery module 110 from spreading to the outside, the battery pack 100 according to an embodiment of the present invention may include an upper case 130.

[0037] 5, the upper case 130 of the battery pack 100 according to an embodiment of the present invention may have a rectangular parallelepiped shape without a bottom surface. The shape of the upper case 130 is not limited thereto, and may have a polyhedral shape.

[0038] The upper case 130 is disposed outside the battery module 110, and may be coupled to the lower case 120 so as to cover the battery module 110. At this time, there are various methods for coupling the upper case 130 to the lower case 120, and the battery pack 100 may include additional parts, such as bolts, for coupling the upper case 130 and the lower case 120 together.

[0039] In addition, the battery pack 100 may further include an additional structure disposed at a portion where the upper case 130 and the lower case 120 are joined to seal the joined portion when the upper case 130 and the lower case 120 are joined.

[0040] When the upper case 130 , which has a rectangular parallelepiped shape and no bottom surface, is coupled to the lower case 120 on which the battery module 110 is disposed, the battery module 110 is disposed inside the upper case 130 .

[0041] Therefore, the battery module 110 disposed between the lower case 120 and the upper case 130 is prevented from coming into contact with the outside due to the combination of the lower case 120 and the upper case 130, thereby minimizing the spread of a flame generated in the battery module 110 to the outside.

[0042] As an example of a configuration for discharging smoke, dust, etc. generated in the event of a fire in the battery module 110 to the outside of the battery pack 100, the upper case 130 of the battery pack 100 according to an embodiment of the present invention may be formed with a discharge hole 131.

[0043] The exhaust hole 131 formed in the upper case 130 may be formed in a form that penetrates and connects from the inner rear surface to the outer rear surface of the upper case 130 .

[0044] Although there is no limitation on the cross-sectional shape of the discharge hole 131, the discharge hole 131 according to an embodiment of the present invention may have a rectangular cross-section. In addition, preferably, the horizontal length of the discharge hole 131 having a rectangular cross-section may be smaller than the distance between the first protruding wall 143 and the second protruding wall 144 described later.

[0045] As the flame is reduced or extinguished through the flame propagation prevention unit 140, smoke, dust, etc. are exhausted to the outside through the exhaust hole 131 formed in the upper case 130. Therefore, the exhaust hole 131 can reduce the risk of an explosion, etc. occurring inside the battery pack 100.

[0046] As an example of a configuration capable of delaying the propagation of a flame occurring in the battery module 110, the battery pack 100 according to an embodiment of the present invention may include a flame propagation prevention unit 140.

[0047] 6 and 7, the flame propagation prevention unit 140 may include a blocking wall 141 and passage walls 142a, 142b.

[0048] The flame propagation prevention unit 140 of the battery pack 100 according to an embodiment may be disposed inside the upper case 130 in a state in which the upper case 130 is coupled to the lower case 120. Specifically, the flame propagation prevention unit 140 may be disposed closer to the inner rear surface of the upper case 130 than to the inner front surface.

[0049] The blocking wall 141 of the flame propagation prevention unit 140 may be disposed spaced apart from the inner rear surface of the upper case 130 .

[0050] The blocking wall 141 may have a plate shape extending in the lateral direction of the upper case 130, and the lateral length of the blocking wall 141 may be smaller than the lateral length of the upper case 130. In addition, the upper surface of the blocking wall 141 contacts the upper surface of the upper case 130, and the lower surface of the blocking wall 141 contacts the lower surface of the upper case 130, so that no gap is generated at the upper or lower part of the blocking wall 141.

[0051] There is no limit to the thickness of the insulating wall 141, and the insulating wall 141 is made of a material that has high resistance to heat caused by a fire.

[0052] The passage walls 142a, 142b of the flame propagation prevention unit 140 may be connected at one end to the blocking wall 141, extend in a direction away from the blocking wall 141, and be disposed apart from the inner surface of the upper case 130. Preferably, the passage walls 142a, 142b may be disposed parallel to the inner surface of the upper case 130 having a rectangular shape.

[0053] The flame propagation prevention unit 140 according to an embodiment of the present invention may include two passage walls 142a and 142b. That is, the two passage walls 142a and 142b may be disposed separately on two inner surfaces formed on both the left and right sides of the upper case 130.

[0054] The passage walls 142a, 142b may have a plate shape extending in the vertical direction of the upper case 130, and the length by which the passage walls 142a, 142b extend in a direction away from the blocking wall 141 may be smaller than the vertical length of the upper case 130. In addition, the upper surfaces of the passage walls 142a, 142b contact the upper surface of the upper case 130, and the lower surfaces of the passage walls 142a, 142b contact the lower surface of the upper case 130, so that no gaps are generated at the top or bottom of the passage walls 142a, 142b.

[0055] A passage through which flames, smoke, dust, etc. generated in the battery module 110 can move may be formed by the passage walls 142a, 142b and the lower, upper, and inner surfaces of the upper case 130. The flames, smoke, dust, etc. moving through the passage thus formed may move to a space formed by the blocking wall 141 and the lower, upper, and inner rear surfaces of the upper case 130.

[0056] There is no limit to the thickness of the passage walls 142a, 142b, and the passage walls 142a, 142b may be made of a material that is highly resistant to heat from a fire.

[0057] As an example of a configuration for reducing a flame generated in the battery module 110, the flame propagation prevention unit 140 of the battery pack 100 according to one embodiment of the present invention may further include a first protruding wall 143 and a second protruding wall 144.

[0058] The first protruding wall 143 of the flame propagation prevention unit 140 may extend from the blocking wall 141 toward the inner rear surface of the upper case 130 so as not to contact the inner rear surface of the upper case 130, and the second protruding wall 144 of the flame propagation prevention unit 140 may extend from the inner rear surface of the upper case 130 toward the blocking wall 141 so as not to contact the blocking wall 141. Also, the first protruding wall 143 and the second protruding wall 144 may be formed in plurality and may be arranged alternately.

[0059] Due to the alternating arrangement of the first protruding walls 143 and the second protruding walls 144, the flame propagation prevention unit 140 can form a meandering space when viewed from above. A flame generated in the battery module 110 becomes weaker and weaker as it moves through this space.

[0060] The first protruding wall 143 and the second protruding wall 144 may have a plate shape extending in the vertical direction of the upper case 130, and the extended length of the first protruding wall 143 and the second protruding wall 144 may be smaller than the distance between the blocking wall 141 and the rear inner surface of the upper case 130. In addition, the first protruding wall 143 and the second protruding wall 144 are arranged such that no gap is generated at the top or bottom of the first protruding wall 143 and the second protruding wall 144 by having the upper surfaces of the first protruding wall 143 and the second protruding wall 144 contact the upper surface of the upper case 130 and the lower surfaces of the first protruding wall 143 and the second protruding wall 144 contact the lower surface of the upper case 130.

[0061] Since the flame propagation prevention unit 140 of the battery pack 100 according to one embodiment of the present invention includes the first protruding wall 143 and the second protruding wall 144, a flame generated in the battery module 110 inside the battery pack 100 can be prevented from being weakened or extinguished as it moves through the space formed by the first protruding wall 143 and the second protruding wall 144 and from spreading to the outside.

[0062] As an example of a configuration for preventing the propagation of flame between the battery modules 110, the battery pack 100 according to an embodiment of the present invention may further include a horizontal partition wall 150 and a vertical partition wall 160.

[0063] The horizontal partition wall 150 may be extended to contact the vertical partition wall 160 and the blocking wall 141 of the flame propagation prevention unit 140, and may be disposed between the battery modules 110 such that adjacent battery modules 110 are isolated from each other. The horizontal partition wall 150 according to an embodiment of the present invention may be disposed alongside the battery modules 110 that are disposed in parallel.

[0064] The horizontal partition wall 150 may have a plate shape extending in the longitudinal direction of the battery module 110. The shape of the horizontal partition wall 150 is not limited thereto, provided that the shape is capable of isolating adjacent battery modules 110 between the battery modules 110.

[0065] As an example of a configuration for preventing deformation in the event of a fire in the battery module 110, the horizontal partition wall 150 of the battery pack 100 according to an embodiment of the present invention may include a steel material.

[0066] In order to prevent the fire from spreading to other adjacent battery modules 110 even if a fire occurs in the battery module 110, the horizontal partition 150 may include a steel material having high heat resistance, and may preferably be made of a steel material.

[0067] The horizontal partition walls 150 made of steel material are not physically deformed even if a fire occurs in the battery module 110, and therefore the spread of the fire can be prevented.

[0068] As an example of a configuration for preventing the spread of heat in the event of a fire in the battery module 110, a heat insulating sheet 151 may be attached to the horizontal partition wall 150 of the battery pack 100 according to an embodiment of the present invention.

[0069] The heat insulating sheet 151 may be attached to a surface of the horizontal partition wall 150 facing the battery module 110. Thus, the heat insulating sheet 151 may be attached to both surfaces or one surface of the horizontal partition wall 150 facing the battery module 110.

[0070] The heat insulating sheet 151 may have a thin plate shape so that it can be easily attached to the surface of the horizontal partition wall 150 .

[0071] By attaching the heat insulating sheet 151 to the horizontal partition wall 150, even if a fire occurs in a battery module 110, the heat can be prevented from spreading to other adjacent battery modules 110. In addition, the heat emitted from the battery module 110 can be prevented from spreading to other battery modules 110, thereby preventing the occurrence of a fire in advance.

[0072] The heat insulating sheet 151 according to an embodiment of the present invention may include mica. Preferably, the heat insulating sheet 151 may be made of mica.

[0073] Mica has excellent fire resistance and heat insulation properties, so when a fire occurs in the battery module 110, the insulation sheet 151 containing mica can withstand the fire without burning and can prevent heat from diffusing to adjacent battery modules 110.

[0074] The vertical partition 160 may extend to contact both inner sides of the upper case 130 and may be disposed to separate the front surface of the battery module 110 from the inner front surface of the upper case 130. That is, the vertical partition 160 according to an embodiment of the present invention may be disposed perpendicular to the battery modules 110 disposed in parallel.

[0075] Therefore, the horizontal partition wall 150 and the vertical partition wall 160 according to an embodiment of the present invention may intersect perpendicularly to each other. The horizontal partition wall 150 and the vertical partition wall 160 perpendicularly intersect each other, so that the battery modules 110 are efficiently isolated from contact with the outside and adjacent battery modules 110 are efficiently isolated from each other. That is, the possibility of a fire occurring in the battery module 110 spreading can be reduced.

[0076] The vertical partition wall 160 may have a plate shape extending in the width direction of the battery module 110. The shape of the vertical partition wall 160 is not limited thereto, as long as it isolates the battery module 110 from the outside.

[0077] As an example of a configuration for quickly putting out a fire that occurs in the battery module 110, the battery pack 100 according to an embodiment of the present invention may further include a water injection system 170.

[0078] The water injection system 170 may be disposed penetrating from the outer front surface to the inner front surface of the upper case 130. The water injection system 170, which may be disposed in this manner, may include a passage through which water can be injected toward the battery module 110 located inside the upper case 130.

[0079] The water injection system 170 injects water toward the battery module 110 inside the upper case 130 in the event of a fire in the battery module 110, so that a system for automatically injecting water in the event of a fire may be prepared and may be connected to a configuration that can receive a supply of water for injection.

[0080] The battery pack 100 further includes a water injection system 170, so that in the event of a fire occurring in the battery module 110, water can be injected through the passages of the water injection system 170, thereby enabling the fire to be put out early and the spread of the fire to be prevented in advance.

[0081] The battery pack 100 according to an embodiment of the present invention may further include a battery management system 180 as an example of a configuration for checking for problems including fire, heat generation, etc. that may occur in the battery module 110.

[0082] The battery management system 180 may be disposed inside the upper case 130 and may also include components such as a display that may indicate the status of the battery pack 100.

[0083] The battery management system 180 can check various conditions of the battery pack 100. Specifically, the battery management system 180 can monitor the voltage, current, and temperature of the battery to maintain and manage the battery in an optimal state. Also, the battery management system 180 can predict the time to replace the battery and detect problems in advance, thereby extending the life of the battery pack 100. In addition, the battery management system 180 can detect abnormal temperatures inside the battery pack 100 and overheating due to overvoltage and overcurrent charging in advance.

[0084] The battery pack 100 further includes a battery management system 180, which can detect the occurrence of a fire or the like in advance and deal with it early.

[0085] As an example of a configuration for reducing heat generated in the battery module 110, the battery pack 100 according to an embodiment of the present invention may further include a thermal interface material 190.

[0086] The thermal interface material 190 may be disposed between the lower case 120 and the battery module 110. That is, the lower case 120, the thermal interface material 190, and the battery module 110 may be disposed in this order from the bottom.

[0087] At this time, although not specifically shown in the embodiment of the present invention, the battery pack 100 may further include a heat sink, a cooling plate, or the like below the thermal interface material 190 to remove heat transferred through the thermal interface material 190.

[0088] The thermal interface material 190 can minimize the contact thermal resistance, i.e., can increase the amount of heat transferred to a heat sink, a cooling plate, etc., so that the heat generated in the battery module 110 can be efficiently removed.

[0089] The thermal interface material 190 may be composed primarily of a material that has high thermal conductivity.

[0090] The battery pack 100 further includes a thermal interface material 190, which prevents heat from diffusing between the battery modules 110 and efficiently removes heat generated in the battery modules 110, thereby reducing the risk of fire.

[0091] The battery pack 100 according to one embodiment of the present invention prevents a flame generated inside from being exposed and spreading to the outside, and reduces the risk of an explosion inside by discharging smoke, gas, dust, etc. to the outside. Furthermore, the battery pack 100 can delay and prevent a chain reaction of fire by autonomously suppressing a flame inside, thereby improving the safety of the product.

[0092] Hereinafter, a description will be given of a specific configuration of the battery pack 100 through other embodiments having a different number of battery modules 110. Also, detailed description of the same configuration as the battery pack 100 according to an embodiment of the present invention will be omitted.

[0093] A battery pack 100 according to another embodiment of the present invention may include three battery modules 110.

[0094] According to the present embodiment, three battery modules 110 may be arranged side by side on the upper part of the lower case 120, and horizontal partition walls 150 may be arranged between two battery modules 110 and the remaining one battery module 110.

[0095] Therefore, a flame generated by two battery modules 110 can move into the inside of the flame propagation prevention unit 140 through one passage wall 142a, and a flame generated in the remaining battery module 110 can move into the inside of the flame propagation prevention unit 140 through the other passage wall 142b.

[0096] A battery pack 100 according to another embodiment of the present invention may include four battery modules 110.

[0097] According to the present embodiment, four battery modules 110 may be arranged in a row on the upper portion of the lower case 120, and horizontal partition walls 150 may be arranged between two battery modules 110 and the remaining two battery modules 110.

[0098] Therefore, a flame generated by two battery modules 110 can move into the interior of the flame propagation prevention unit 140 through one passage wall 142a, and a flame generated by the remaining two battery modules 110 can move into the interior of the flame propagation prevention unit 140 through the other passage wall 142b.

[0099] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the technical spirit of the present invention and the equivalent scope of the claims described below by a person having ordinary skill in the art to which the present invention pertains. [Explanation of symbols]

[0100] 100 Battery Packs 110 Battery module 120 Lower Case 130 Upper case 131 Discharge hole 140 Flame Propagation Prevention Unit 141 Barrier 142a Passage wall 142b Passage wall 143 1st protruding wall 144 Second protruding wall 150 horizontal bulkhead 151 Insulation sheet 160 Vertical bulkhead 170 Water Injection System 180 Battery Management System 190 Thermal Interface Materials

Claims

1. Plate-shaped lower case; a plurality of battery modules disposed on the lower case; an upper case having a polyhedral shape without a bottom surface and coupled to the lower case so as to cover the battery module; and a flame propagation prevention unit disposed inside the upper case and spaced apart from a front surface of the battery module, the front surface being a surface on which an electrode terminal is provided, the flame propagation prevention unit preventing propagation of a flame occurring in the battery module; A battery pack comprising: The flame propagation prevention unit includes: a blocking wall disposed apart from the inner rear surface of the upper case; and the passage wall having one end connected to the blocking wall and one end of the passage wall, the passage wall extending in a direction away from the blocking wall, the passage wall being disposed at a distance from an inner surface of the upper case; A battery pack comprising:

2. The flame propagation prevention unit includes: a plurality of first protruding walls extending from the blocking wall toward the inner rear surface of the upper case so as not to contact the inner rear surface of the upper case; and a plurality of second protruding walls extending from the inner rear surface of the upper case toward the blocking wall so as not to contact the blocking wall; Further comprising: The battery pack according to claim 1 , wherein the first protruding walls and the second protruding walls are arranged alternately.

3. The battery pack includes: a horizontal partition wall having a plate shape extending in the longitudinal direction of the battery module and disposed between the battery modules such that adjacent battery modules are isolated from each other; and a vertical partition wall having a plate shape extending in a width direction of the battery module and disposed to separate the front surface of the battery module from an inner front surface of the upper case; The battery pack of claim 1 further comprising:

4. The battery pack according to claim 3 , wherein the horizontal partition wall and the vertical partition wall intersect perpendicularly to each other.

5. The horizontal bulkhead is 4. The battery pack of claim 3, comprising a steel material.

6. The battery pack according to claim 3 , further comprising a heat insulating sheet attached to a surface facing the battery module.

7. The heat insulating sheet is 7. The battery pack of claim 6, comprising mica.

8. The upper case includes: The battery pack according to claim 1 , wherein a discharge hole is formed penetrating from the inner rear surface to the outer rear surface of the upper case.

9. The battery pack includes: The upper case further includes a water injection system disposed through the upper case from the outer front surface to the inner front surface, The water injection system comprises: The battery pack according to any one of claims 1 to 8, further comprising a passage through which water can be injected toward the battery module inside the upper case.

10. The battery pack includes: The battery pack of claim 1 , further comprising a battery management system disposed inside the upper case and configured to check a state of the battery modules.

11. The battery pack includes: The battery pack according to claim 1 , further comprising a plate-shaped thermal interface material disposed between the lower case and the battery module.

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