Battery assembly

Abstract

A battery assembly is disclosed. The battery assembly includes a case in which a space is defined inside, a plurality of battery cells located inside the case and stacked in one direction, a first pad including a first case located between the plurality of battery cells and a first material located inside the first case, and a second pad including a second case located between the plurality of battery cells and in contact with the first case and a second material located inside the second case.

Description

Technical Field

[0001] This disclosure relates to a battery assembly.

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2024-0154649, filed with the Korean Intellectual Property Office on November 4, 2024, the disclosure of which is incorporated herein by reference in its entirety. Background Technology

[0003] With the significant increase in demand for portable electronic products such as smartphones, tablet PCs and smartwatches, and the growing prevalence of electric vehicles, research is actively underway on batteries installed in these vehicles, especially rechargeable batteries that allow for repeated charging and discharging.

[0004] Currently, commercially available rechargeable batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium rechargeable batteries. Among them, lithium rechargeable batteries have very little or no memory effect. Therefore, due to their advantages of easy recharging, very low self-discharge rate, and high energy density, lithium rechargeable batteries have received more attention than nickel-based rechargeable batteries.

[0005] Lithium-ion secondary batteries mainly consist of lithium-based oxides and carbon materials used as positive and negative electrode active materials, respectively. A lithium-ion secondary battery includes: an electrode assembly comprising a positive electrode plate and a negative electrode plate coated with positive and negative electrode active materials, respectively, with a separator inserted between the positive and negative electrode plates; and a sealed package or battery casing housing the electrode assembly and electrolyte solution.

[0006] Generally, based on the shape of the battery casing, lithium secondary batteries can be classified into can-type secondary batteries with electrode assemblies contained in a metal can and pouch-type secondary batteries with electrode assemblies contained in a pouch of aluminum laminate.

[0007] Recently, secondary batteries have been widely used in medium to large-sized devices such as electric vehicles and energy storage systems (ESS) for driving and storing energy, as well as small devices such as portable electronic devices. Multiple secondary batteries can be electrically connected and stored inside a module housing to form a battery module. In this case, each secondary battery included in a battery module can be referred to as a battery cell. Alternatively, multiple battery modules can be connected to each other to form a battery pack.

[0008] However, when a battery pack comprises multiple battery modules, and each battery module comprises multiple battery cells, it may be susceptible to thermal cascading effects between battery modules or between battery cells. For example, when an event such as thermal runaway occurs within a single battery module, the propagation of thermal runaway to other battery modules or other battery cells must be prevented. If the propagation of thermal runaway between battery modules or between battery cells is not properly suppressed, an event occurring in a particular battery module or battery cell may lead to thermal cascading effects in other battery modules or other battery cells, potentially resulting in an explosion or fire, or its escalation.

[0009] Specifically, when an event such as thermal runaway occurs in a single battery module, gas or flames can be randomly emitted to the outside. If the emission of gas or flames is not properly controlled, it may be emitted towards other battery modules, potentially causing a thermal cascade in those modules. In particular, module terminals may be located on the front side of the battery module, and components such as module busbars for electrical connection to other battery modules or battery packs may be present. Therefore, if a flame is emitted to the front side of a battery module, it may damage the module terminals within the battery pack and potentially cause an electrical short circuit. Furthermore, since other battery modules may be located on the front side of the battery module, if a flame is emitted to the front side of a particular battery module, the emitted flame may be directed to other battery modules, easily leading to the spread of fire between battery modules.

[0010] If heat transfer between battery modules or individual battery cells is not properly controlled, a sudden voltage drop may occur within the battery module or battery pack. This could cause the device housing the battery module or battery pack to shut down abruptly, resulting in unexpected damage. For example, if a sudden voltage drop occurs in the battery pack while an electric vehicle is operating, there will be no time to move the vehicle to a safe location.

[0011] Furthermore, if heat transfer between battery modules or individual battery cells is not properly controlled, potentially causing a sudden fire or explosion, the risk of injury or death to users is high. For example, in the event of thermal runaway in an electric vehicle, if sufficient time is not allowed before the fire fully erupts, occupants may not be able to evacuate safely. Summary of the Invention

[0012] Technical issues

[0013] This disclosure is designed to solve problems in related technologies, and therefore relates to providing a battery pack having an improved structure to properly control emissions of flames or the like generated inside the battery pack, and a vehicle including the battery pack.

[0014] This disclosure also relates to a battery assembly capable of discharging a very large volume of material into a housing in the event of a thermal event.

[0015] This disclosure also relates to a battery assembly capable of preventing the propagation of a thermal event by filling the interior of the casing with a foam material in the event of a thermal event.

[0016] Technical solution

[0017] In one aspect of this disclosure, a battery assembly is provided, comprising: a housing having an interior space; a plurality of battery cells located inside the housing and stacked in one direction; a first pad including a first housing located between the plurality of battery cells and a first material located inside the first housing; and a second pad including a second housing located between the plurality of battery cells and in contact with the first housing and a second material located inside the second housing.

[0018] In addition, the first and second materials can be configured to react with each other and expand.

[0019] Additionally, the first housing may include: a first contact portion that contacts the second housing; and a first outer portion that is configured to extend from the first contact portion.

[0020] In addition, the melting point of the first contact portion can be lower than the melting point of the first outer portion.

[0021] Additionally, the first housing may include: a first hole disposed in the first contact portion; and a first melting member coupled to the first contact portion and configured to cover the first hole.

[0022] Additionally, the second housing may include: a second contact portion that contacts the first contact portion; and a second outer portion that is configured to extend from the second contact portion.

[0023] Additionally, the battery assembly may include an adhesive member disposed between the first contact portion and the second contact portion.

[0024] In addition, the melting point of the second contact portion can be lower than that of the second outer portion.

[0025] In addition, the melting point of the second contact portion can be lower than that of the first outer portion.

[0026] Additionally, the second housing may also include: a second hole disposed in the second contact portion and configured to face the first hole; and a second melting member coupled to the second contact portion and configured to cover the second hole.

[0027] In addition, multiple first and second holes can be set.

[0028] In addition, multiple first pads can be set.

[0029] A vehicle according to one aspect of this disclosure may include the battery assembly disclosed herein.

[0030] Beneficial effects

[0031] According to at least one embodiment of this disclosure, flames or particles can be prevented from being ejected to the outside of the casing in the event of a thermal event.

[0032] According to at least one embodiment of this disclosure, when a thermal event occurs, the propagation of the thermal event can be prevented by filling the interior of the shell with foam material. Attached Figure Description

[0033] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, are intended to provide a further understanding of the technical features of the present disclosure. Therefore, the present disclosure is not to be construed as being limited to the accompanying drawings.

[0034] Figure 1 This is a diagram illustrating a first battery assembly according to an embodiment of the present disclosure.

[0035] Figure 2 It is shown Figure 1 An exploded view of a portion of the first battery assembly.

[0036] Figure 3 It is shown Figure 2 An exploded view of a portion of the first pad.

[0037] Figure 4 It is shown Figure 2 An exploded view of a portion of the second pad.

[0038] Figure 5 It is shown Figure 2 An exploded view of a portion of the pad assembly.

[0039] Figure 6 It is shown Figure 2 A diagram of the pad assembly.

[0040] Figure 7 It is along Figure 6 The sectional view taken by the cutting line B-B'.

[0041] Figure 8 It is along Figure 1 The sectional view cut by the cutting line A-A'.

[0042] Figure 9 This shows what happens when a thermal event occurs. Figure 8 A graph showing the changes in [the data / process].

[0043] Figure 10 It is shown Figure 5 A diagram of a modified embodiment.

[0044] Figure 11 It is shown Figure 3 A diagram of a modified embodiment.

[0045] Figure 12 It is shown Figure 4 A diagram of a modified embodiment.

[0046] Figure 13 It is shown Figure 7 A diagram of a modified embodiment.

[0047] Figure 14 It is shown Figure 9 A diagram of a modified embodiment.

[0048] Figure 15 This is an exploded view showing a portion of the components of a second battery assembly according to an embodiment of the present disclosure.

[0049] Figure 16 This is a diagram illustrating a second battery assembly according to an embodiment of the present disclosure.

[0050] Figure 17 This is a diagram illustrating a vehicle according to an embodiment of the present disclosure. Detailed Implementation

[0051] In the following description, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its general or dictionary meaning, but should be interpreted according to the meaning and concept corresponding to the technical aspects of the present disclosure, based on the principle that the inventors are allowed to properly define the terminology for the best interpretation.

[0052] Therefore, the description presented herein is merely a preferred example for illustrative purposes only and is not intended to limit the scope of this disclosure. It should be understood that other equivalent substitutions and modifications may be made therein without departing from the scope of this disclosure.

[0053] Figure 1 This is a diagram illustrating a first battery assembly 200 according to an embodiment of the present disclosure. Figure 2 It is shown Figure 1 An exploded view of a portion of the first battery assembly 200.

[0054] Reference Figure 1 and Figure 2A first battery assembly 200 according to an embodiment of the present disclosure may include a first housing 201. The first housing 201 may include a first top cover 210a and a lower frame 210b. The interior of the first housing 201 may have a space. The lower frame 210b may include a first base plate 210b1 and a pair of side plates 210b2. The first top cover 210a may be mounted, fastened, joined, secured, or attached to the pair of side plates 210b2. For example, the first top cover 210a may be joined to the lower frame 210b by welding. The first top cover 210a and the lower frame 210b may form a frame 210. The frame 210 may have an open front surface and an open rear surface.

[0055] The first battery assembly 200 may include individual battery cells 220. Each individual battery cell 220 may refer to a secondary battery. Specifically, the individual battery cell 220 may be a pouch-type secondary battery. However, the shape of the individual battery cell 220 is not limited to a pouch shape, and the individual battery cell 220 may have various shapes, such as cylindrical or cuboid. Multiple individual battery cells 220 may be provided. The individual battery cells 220 may be housed within the first housing 201.

[0056] The battery cell 220 may extend along a front-to-back direction or an X-axis direction. Multiple battery cells 220 may be stacked along one direction. For example, multiple battery cells 220 may be stacked along a left-to-right direction or a Y-axis direction. The battery cell 220 may include a receiving portion 221 for accommodating electrode assemblies, a first sealing portion 222 projecting forward and backward from the receiving portion 221, and a second sealing portion 223 projecting upward from the receiving portion 221. Additionally, the battery cell 220 may include electrode leads 224 projecting forward and backward from the first sealing portion 222, respectively. The electrode leads 224 may project forward and backward from each receiving portion 221.

[0057] A pad assembly 270 may be arranged between multiple battery cells 220. The pad assembly 270 may be arranged between at least a portion of the battery cells 220 and / or at the periphery of the stack. For example, the pad assembly 270 may be configured to be arranged between every four battery cells 220 stacked in the left-right direction.

[0058] The pad assembly 270 may include a first pad 250. The first pad 250 may include a first housing 251. The first housing 251 may be located between a plurality of battery cells 220. The interior of the first housing 251 may have a space. The first pad 250 may include a first material 410. The first material 410 may be located inside the first housing 251.

[0059] The pad assembly 270 may include a second pad 260. The second pad 260 may contact the first pad 250. The second pad 260 may be coupled, fastened, attached, or secured to the first pad 250. The second pad 260 may include a second housing 261. The second housing 261 may be located between a plurality of battery cells 220. The interior of the second housing 261 may have a space. The second pad 260 may contain a second material 420. The second material 420 may be located inside the second housing 261.

[0060] In the event of a thermal event, the first housing 251 may melt. If the first housing 251 melts, the first material 410 (see...) Figure 9 There is a possibility of leakage. In the event of a thermal event, the second housing 261 may melt. If the second housing 261 melts, the second material 420 (see...) Figure 9 (This may leak.) In the event of a thermal event, the first material 410 and the second material 420 can mix. The first material 410 and the second material 420 can react chemically with each other. The first material 410 and the second material 420 can react to produce a third material 430 (see...). Figure 9 The third material 430 can be a material with a very large volume. The third material 430 can be a foam material. The third material 430 can be a porous material. The third material 430 can contain materials with low thermal conductivity. The third material 430 can contain materials with high thermal insulation properties. For example, the third material 430 can include polyurethane resin-based foam, epoxy resin-based foam, phenol resin-based foam, etc.

[0061] Depending on the type of the third material 430, the first material 410 and the second material 420 that form the third material 430 can be selected respectively.

[0062] If the third material 430 is a polyurethane resin-based foam, then the first material 410 and the second material 420 can be a polyol compound and an isocyanate compound, respectively.

[0063] Polyol compounds may include, but are not limited to, polytetramethylene glycol (PTMG), polycaprolactone (PCL), polyethylene glycol (PEG), polyoxytrimethylene ether glycol (PO3G), or two or more of these.

[0064] The isocyanate compounds include, but are not limited to, toluene diisocyanate (TDI), naphthalene-1,5-diisocyanate, p-phenylene diisocyanate, benzyltoluidine diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate (HDI), dicyclohexylmethane diisocyanate, methylene diphenyl diisocyanate (MDI), 1-isocyano-4-[(4-hexyl isocyanate)methyl]cyclohexane (H12MDI), isophorone diisocyanate, or two or more thereof. Additionally, when the third material 430 is a polyurethane resin-based foam, it may contain a blowing agent in addition to the first material 410 and the second material 420, and examples of the blowing agent include, but are not limited to, water, hydrofluorocarbons (HFCs), dichloromethane, n-butane, isobutane, n-pentaneisopentane, dimethyl ether, acetone, carbon dioxide, or two or more thereof.

[0065] If the third material 430 is epoxy resin-based foam, then the first material 410 and the second material 420 can be epoxy resin and a hardener, respectively.

[0066] Epoxy resins may include epoxy resins having glycidylamino groups derived from m-phenylenediamine, epoxy resins having glycidylamino groups derived from p-phenylenediamine, epoxy resins having glycidylamino groups derived from 1,3-bis(aminomethyl)cyclohexane, epoxy resins having glycidylamino groups derived from 1,4-bis(aminomethyl)cyclohexane, epoxy resins having glycidylamino groups derived from diaminodiphenylmethane, epoxy resins having glycidylamino groups and / or glycidyloxy groups derived from p-aminophenol, epoxy resins having glycidyloxy groups derived from bisphenol A, epoxy resins having glycidyloxy groups derived from bisphenol F, epoxy resins having glycidyloxy groups derived from phenolic varnish, epoxy resins having glycidyloxy groups derived from resorcinol, or two or more of these, but are not limited thereto.

[0067] The hardener may include amino hardeners and may include 1,3-phenylenediamine, ethylenediamine, 1,3-diaminopropane, 1,4-diaminopropane, hexamethylenediamine, 2,5-dimethylhexamethylenediamine, trimethylhexamethylenediamine, diethylenetriamine, iminodipropylamine, bis(hexamethylene)triamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, N-hydroxyethylethylenediamine, tetra(hydroxyethyl)ethylenediamine, triethylene glycol diamine, tetraethylene glycol diamine, diethylene glycol bis(propylamine), polyoxypropylene diamine, polyoxypropylene triamine, isophorone diamine, m-phenylenediamine, N-aminoethylpiperazine, bis(4-amino-3-methyldicyclohexyl)methane, bis(aminomethyl)cyclohexane, 3 ,9-bis(3-aminopropyl)2,4,8,10-tetraoxaspiro(5,5)undecane, norbornenediamine, tetrachloro-p-xylenediamine, m-xylenediamine, p-xylenediamine, m-phenylenediamine, o-phenylenediamine, p-phenylenediamine, 2,4-diaminoanisole, 2,4-toluenediamine, 2,4-diaminodiphenylmethane, 4,4'-diaminodiphenylmethane, 4,4'-diamino1,2-diphenylethane, 2,4-diaminodiphenylsulfone, m-aminophenol, m-aminobenzylamine, benzyldimethylamine, 2-(dimethylaminomethyl)phenol, triethanolamine, methylbenzylamine, α-(m-aminophenyl)ethylamine, α-(p-aminophenyl)ethylamine, diaminodiphenylmethane, α,α'-bis(4-aminophenyl)-p-diisopropylbenzene, or two or more of these, but not limited thereto.

[0068] If the third material 430 is a phenol resin-based foam, then the first material 410 and the second material 420 can be a phenol compound and an aldehyde compound, respectively.

[0069] Phenolic compounds may include, but are not limited to, phenol, cresol, xylenol, p-alkylphenol, p-phenylphenol, resorcinol, or two or more of these.

[0070] Examples of aldehyde compounds may include, but are not limited to, formaldehyde, formalin, paraformaldehyde, furfural, acetaldehyde, or two or more of these.

[0071] In the event of a thermal event, the third material 430 can fill the interior of the first casing 201. The third material 430 can expand to surround the battery cell 220. The third material 430 can prevent the propagation of exhaust gases or particles such as combustible particles. The third material 430 can prevent the propagation of a thermal event.

[0072] Busbar frame assemblies 230 can be respectively provided on the front and rear sides of the multiple battery cells 220. The busbar frame assemblies 230 can be electrically connected to the electrode leads 224 of the multiple battery cells 220.

[0073] A pair of end caps 240 can be attached to the front and rear sides of the frame 210, respectively. The pair of end caps 240 can cover the front and rear surfaces of the frame 210. The end caps 240 can have a square shape. The pair of end caps 240 can form the appearance of the first battery assembly 200. The first housing 201 may include the pair of end caps.

[0074] Reference Figure 1 and Figure 2 The pad assembly 270 can be configured in multiple ways. Each pad assembly 270 may include a first pad 250 and a second pad 260. The first pad 250 and the second pad 260 may be configured to correspond to each other in a one-to-one relationship.

[0075] By providing multiple pad components 270, the propagation of thermal events can be effectively prevented.

[0076] Figure 3 It is shown Figure 2 An exploded view of a portion of the first pad 250. (Refer to...) Figures 1 to 3 The first housing 251 may include a first contact portion 253. The first contact portion 253 may contact, engage, fix, or attach to the second pad 260. The first contact portion 253 may contact, engage, fix, or attach to the second housing 261.

[0077] The first housing 251 may include a first outer portion 252. The first outer portion 252 may extend from the first contact portion 253. The interior of the first outer portion 252 may have a space. The first housing 251 may include a first connecting portion 252a. The first connecting portion 252a may be formed along the periphery of the first outer portion 252. The first contact portion 253 may contact, connect, fix, or attach to the first connecting portion 252a. A first material 410 may be accommodated within the first housing 251.

[0078] Figure 4 It is shown Figure 2 An exploded view of a portion of the second pad 260. (Refer to...) Figures 1 to 4 The second housing 261 may include a second contact portion 263. The second contact portion 263 may contact, engage, fix, or attach to the first pad 250. The second contact portion 263 may contact, engage, fix, or attach to the first housing 251.

[0079] The second housing 261 may include a second outer portion 262. The second outer portion 262 may extend from the second contact portion 263. A space may be provided inside the second outer portion 262. The second housing 261 may include a second connecting portion 262a. The second connecting portion 262a may be formed along the periphery of the second outer portion 262. The second contact portion 263 may contact, connect, fix, or attach to the second connecting portion 262a. The second material 420 may be accommodated within the second housing 261.

[0080] Figure 5 It is shown Figure 2 An exploded view of a portion of the pad assembly 270. Figure 6 It is shown Figure 2 The diagram shows the pad assembly 270. Figure 7 It is along Figure 6 The sectional view taken by the cutting line B-B'.

[0081] Reference Figures 5 to 7 The first pad 250 and the second pad 260 can constitute the pad assembly 270. The first contact portion 253 and the second contact portion 263 can face each other. The first contact portion 253 can contact, engage, fix or attach to the second contact portion 263.

[0082] The first pad 250 and the second pad 260 can be configured to have substantially the same shape or size.

[0083] Figure 8 It is along Figure 1 The sectional view cut by the cutting line A-A'. Figure 9 This shows what happens when a thermal event occurs. Figure 8 A graph showing the changes in [the data / process].

[0084] Reference Figure 8 and Figure 9 The melting point of the first contact portion 253 may be lower than that of the first outer portion 252. The first contact portion 253 may contain a material having a lower melting point than the first outer portion 252. In the event of a thermal event, the temperature inside the first battery assembly 200 may rise. At this time, the first contact portion 253 may melt before the first outer portion 252. As a result, the first material 410 may leak.

[0085] The melting point of the second contact portion 263 may be lower than that of the second outer portion 262. The second contact portion 263 may contain a material having a lower melting point than the second outer portion 262. In the event of a thermal event, the temperature inside the first battery assembly 200 may rise. At this time, the second contact portion 263 may melt before the second outer portion 262. As a result, the second material 420 may leak.

[0086] The first contact portion 253 and the second contact portion 263 may contain substantially the same material. The first outer portion 252 and the second outer portion 262 may contain substantially the same material. The melting point of the first contact portion 253 may be lower than the melting point of the second outer portion 262. The first contact portion 253 may contain a material having a lower melting point than the second outer portion 262. The melting point of the second contact portion 263 may be lower than the melting point of the first outer portion 252. The second contact portion 263 may contain a material having a lower melting point than the first outer portion 252.

[0087] When a thermal event occurs, the first contact portion 253 and the second contact portion 263 melt, causing the first material 410 and the second material 420 to react with each other. The first material 410 and the second material 420 generate a third material 430 and expand, which can fill the interior of the first battery assembly 200. The third material 430 can prevent the movement of exhaust gases or particles such as combustible particles.

[0088] Figure 10 It is shown Figure 5 A diagram of a modified embodiment. Refer to... Figure 10 The first battery assembly 200 may further include an adhesive member 256. The adhesive member 256 may be disposed between the first contact portion 253 and the second contact portion 263. The adhesive member 256 may induce the rapid formation of the third material 430 by aligning or fixing the positions of the first contact portion 253 and the second contact portion 263.

[0089] Figure 11 It is shown Figure 3 A diagram of a modified embodiment. Refer to... Figure 11 The first housing 251 may have a first hole 254. The first hole 254 may be disposed in the first contact portion 253. The first housing 251 may also include a first melting member 255. The first melting member 255 may be coupled, fastened, attached, or fixed to the first contact portion 253. The first melting member 255 may cover the first hole 254. The first melting member 255 may contain a material with a low melting point. The melting point of the first melting member 255 may be lower than the melting point of the first outer portion 252. The melting point of the first melting member 255 may be lower than the melting point of the first contact portion 253. The first melting member 255 may open the first hole 254 by melting. There may be multiple first holes 254. The first melting member 255 may cover multiple first holes 254.

[0090] Figure 12 It is shown Figure 4 A diagram of a modified embodiment. Refer to... Figure 12 The second housing 261 may have a second hole 264. The second hole 264 may be disposed in the second contact portion 263. The second housing 261 may also include a second melting member 265. The second melting member 265 may be coupled, fastened, attached, or fixed to the second contact portion 263. The second melting member 265 may cover the second hole 264. The second melting member 265 may contain a material with a low melting point. The melting point of the second melting member 265 may be lower than the melting point of the second outer portion 262. The melting point of the second melting member 265 may be lower than the melting point of the second contact portion 263. The second melting member 265 may open the second hole 264 by melting. Multiple second holes 264 may be provided. The second melting member 265 may cover multiple second holes 264.

[0091] Figure 13 It is shown Figure 7 A diagram of a modified embodiment. Figure 14 It is shown Figure 9 A diagram of a modified embodiment.

[0092] Reference Figures 11 to 14 A plurality of first holes 254 and a plurality of second holes 264 can be configured to correspond to each other in a one-to-one relationship. Each of the plurality of first holes 254 can face a second hole 264. The first melting member 255 and the second melting member 265 can contain substantially the same material. By melting the first melting member 255 and the second melting member 265, the plurality of first holes 254 and the plurality of second holes 264 can communicate with each other. A portion of the plurality of first holes 254 can discharge a first material 410 into the second pad 260. A portion of the plurality of second holes 264 can discharge a second material 420 into the first pad 250. As a result, the first material 410 and the second material 420 can mix rapidly and react. By rapidly generating a third material 430, thermal events can be effectively prevented.

[0093] Figure 15 This is an exploded view showing a portion of the components of a second battery assembly 1000 according to an embodiment of the present disclosure. Figure 16 This is a diagram illustrating a second battery assembly 1000 according to an embodiment of the present disclosure.

[0094] Reference Figure 15 and Figure 16 The second battery assembly 1000 according to an embodiment of the present disclosure may include a second housing 100. The second housing 100 may form the appearance of the second battery assembly 1000. The second housing 100 may have a cuboid shape. The interior of the second housing 100 may have a space. The second housing 100 may include a second top cover 150. The second top cover 150 may have a square plate shape. The second battery assembly 1000 may be located inside the second housing 100.

[0095] The second housing 100 may include a second base plate 110. The second base plate 110 may have a square shape. The second base plate 110 may have a flat shape. The second base plate 110 may form the exterior of the second battery assembly 1000. The second base plate 110 may provide the interior space of the second battery assembly 1000.

[0096] The second housing 100 may include sidewalls 120. The sidewalls 120 may be mounted, fastened, joined, secured, or attached to the upper surface of the second base plate 110. Four sidewalls 120 may be provided. The sidewalls 120 may be arranged along the perimeter of the second base plate 110. The sidewalls 120 may form the appearance of the second battery assembly 1000. The sidewalls 120 may provide internal space.

[0097] The second top cover 150 can be installed, fastened, joined, secured, or attached to the side wall 120. The second top cover 150 can cover the internal space of the second battery assembly 1000.

[0098] The second battery assembly 1000 may include a venting device 500. The venting device 500 may be mounted on a side wall 120. For example, the venting device 500 may be mounted on the front side wall 120. For example, the venting device 500 may be a valve. When the pressure inside the second housing 100 rises, the venting device 500 may open to release gas. Additionally, the venting device 500 may prevent outside air from flowing into the second housing 100. Multiple venting devices 500 may be provided.

[0099] The second battery assembly 1000 may include a partition wall 300. The partition wall 300 may include a first partition wall 310 and a second partition wall 320. Multiple partition walls 300 may be provided. The partition walls 300 may be mounted, fastened, fixed, coupled to, or attached to the upper surface of the second base plate 110. The partition walls 300 may divide the internal space of the second battery assembly 1000. The first battery assembly 200 may be located within the space divided by the partition walls 300.

[0100] For example, the first battery assembly 200 may be referred to as battery module 200. For example, the second battery assembly 1000 may be referred to as battery pack 1000.

[0101] Figure 17 This is a diagram illustrating a vehicle according to an embodiment of the present disclosure. (Refer to...) Figure 17 The vehicle V according to this disclosure may include the second battery assembly 1000 of this disclosure.

[0102] In addition to the first battery assembly 200, the second battery assembly 1000 according to this disclosure may also include various components, such as those known at the time of filing of this application, such as BMS, busbars, relays, current sensors, etc.

[0103] The second battery assembly 1000 according to this disclosure can be applied to vehicles such as electric vehicles or hybrid electric vehicles. That is, in addition to the second battery assembly 1000, the vehicle V according to this disclosure may also include various other components included in the vehicle. For example, the vehicle V according to this disclosure may also include a body, a motor, control devices such as an ECU (electronic control unit), etc.

[0104] This disclosure has been described in detail. However, it should be understood that while the detailed description and specific examples illustrate preferred embodiments of this disclosure, they are given by way of illustration only, as various variations and modifications within the scope of this disclosure will become apparent to those skilled in the art from this detailed description.

Claims

1. A battery assembly, comprising: An outer casing, wherein the interior of the outer casing has a space; Multiple battery cells, which are located inside the housing and stacked in one direction; A first pad, the first pad comprising a first housing located between the plurality of battery cells and a first material located inside the first housing; as well as The second pad includes a second housing located between the plurality of battery cells and in contact with the first housing, and a second material located inside the second housing.

2. The battery assembly according to claim 1, wherein, The first material and the second material are configured to react with each other and expand.

3. The battery assembly according to claim 1, in, The first housing includes: A first contact portion, the first contact portion contacting the second housing; and A first outer portion, the first outer portion being configured to extend from the first contact portion.

4. The battery assembly according to claim 3, in, The melting point of the first contact portion is lower than the melting point of the first outer portion.

5. The battery assembly according to claim 3, in, The first housing also includes: A first hole, wherein the first hole is disposed in the first contact portion; and A first melting member is attached to the first contact portion and configured to cover the first hole.

6. The battery assembly according to claim 5, in, The second housing includes: A second contact portion, the second contact portion contacting the first contact portion; and The second outer portion is configured to extend from the second contact portion.

7. The battery assembly of claim 6, further comprising an adhesive member disposed between the first contact portion and the second contact portion.

8. The battery assembly according to claim 6, wherein, The melting point of the second contact portion is lower than that of the second outer portion.

9. The battery assembly according to claim 6, wherein, The melting point of the second contact portion is lower than that of the first outer portion.

10. The battery assembly according to claim 6, in, The second housing also includes: A second hole, wherein the second hole is disposed in the second contact portion and configured to face the first hole; and The second melting member is attached to the second contact portion and configured to cover the second hole.

11. The battery assembly of claim 10, wherein, The first hole and the second hole are configured in multiple ways.

12. The battery assembly according to claim 1, wherein, The first pad is configured in multiple ways.

13. A vehicle comprising the battery assembly according to any one of claims 1 to 12.

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