Battery module and battery pack with thermally conductive polymer

Abstract

Disclosed are a battery module and a battery pack. In embodiments of the disclosed technology, a battery module may include: a cell assembly including a plurality of cells and at least one thermal propagation blocking assembly disposed between two or more adjacent cells of the plurality of cells; a module housing including a mainboard configured to support the cell assembly; at least one slit formed on the main board and arranged to face the at least one heat propagation blocking component; and a thermally conductive polymer disposed within the at least one slit. The melting point of the thermally conductive polymer may be lower than the melting point of the mainboard.

Description

Technical Field

[0001] The technologies and embodiments disclosed in this patent document generally relate to a battery module. Background Art

[0002] Unlike primary batteries, secondary batteries can be recharged and discharged multiple times and are widely used in various devices and applications including digital cameras, mobile phones, laptop computers, hybrid electric vehicles, electric vehicles, and energy storage systems (ESS). Common types of secondary batteries can include lithium-ion batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-hydrogen batteries. Summary of the Invention

[0003] (I) Technical Problems to be Solved

[0004] A battery device (e.g., a battery module) may include a cell assembly and a module housing. The cell assembly includes a plurality of cells, and the module housing is configured to accommodate the cell assembly. Heat, gas, or flame generated in one of the plurality of cells may be transferred to adjacent cells, potentially causing thermal runaway or thermal propagation.

[0005] The disclosed technologies may be implemented in some embodiments to provide a battery module capable of ensuring the rigidity of the module housing.

[0006] The disclosed technologies may be implemented in some embodiments to provide a battery module capable of delaying thermal propagation between cells.

[0007] Battery modules and battery packs implemented based on some embodiments of the disclosed technologies can be widely applied in green technology fields such as electric vehicles, battery charging stations, and other battery-utilizing solar power generation and wind power generation. Additionally, the battery modules and battery packs of the disclosed technologies can be used in eco-friendly electric vehicles and hybrid electric vehicles that prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0008] (II) Technical Solutions

[0009] A battery module according to some embodiments of the disclosed technologies may include: a cell assembly including a plurality of cells and at least one thermal propagation blocking component disposed between two or more adjacent cells of the plurality of cells; a module housing including a main board configured to support the cell assembly; at least one slit formed in the main board and arranged to face the at least one thermal propagation blocking component; and a thermally conductive polymer disposed in the at least one slit. The melting point of the thermally conductive polymer may be lower than the melting point of the main board.

[0010] In an embodiment, the at least one heat propagation blocking component may include a heat insulating member and a buffer member configured to cover at least one side of the heat insulating member.

[0011] In an embodiment, the at least one slit may face the heat insulating member. The main board may include a chamfered portion configured to support the buffer member and define at least a part of the at least one slit.

[0012] In an embodiment, a second width of the at least one slit may be equal to or less than a first width of the at least one heat propagation blocking component.

[0013] In an embodiment, the second width may be 50% to 90% of the first width.

[0014] In an embodiment, the thermally conductive polymer may include an adhesive and a thermally conductive filler. The adhesive includes at least one of an acrylic resin, an epoxy resin, a polyurethane, and a silicone resin. The thermally conductive filler includes at least one of alumina, boron nitride, and silver.

[0015] In an embodiment, a thermal conductivity of the thermally conductive polymer may be 1 W / mK to 6 W / mK.

[0016] In an embodiment, the at least one heat propagation blocking component and the at least one slit may extend in a second direction perpendicular to the first direction.

[0017] In an embodiment, the at least one slit may include a plurality of through holes spaced apart from each other in the second direction.

[0018] In an embodiment, the battery module may further include: a polymer block disposed in the at least one slit, and at least a part of the polymer block is covered by the thermally conductive polymer.

[0019] In an embodiment, each of the plurality of battery cells may include an electrode assembly, an electrode accommodating portion configured to accommodate an electrode, and a pouch. The pouch includes a sealing portion configured to seal at least a part of the periphery of the electrode accommodating portion.

[0020] In an embodiment, the module housing may include: a receiving portion including the main board in contact with the plurality of battery cells and the at least one heat propagation blocking component and a side wall member extending from the main board; an end plate covering a part of the battery cell assembly; and a module cover covering the battery cell assembly and connected to at least a part of the receiving portion and the end plate.

[0021] A battery module implemented based on some embodiments of the disclosed technology may include: a cell assembly including a plurality of cells and a heat propagation blocking component, the plurality of cells being stacked along a first direction, the heat propagation blocking component being disposed between two or more adjacent cells among the plurality of cells and extending along a second direction perpendicular to the first direction; a module housing accommodating the cell assembly; a slit formed in the module housing and arranged to face the heat propagation blocking component and extending along the second direction; and a thermally conductive polymer disposed in the slit.

[0022] A battery pack implemented based on some embodiments of the disclosed technology may include: a plurality of battery modules; and a battery pack frame configured to accommodate the plurality of battery modules. Each of the plurality of battery modules may include: a cell assembly including a plurality of cells and at least one heat propagation blocking component, the at least one heat propagation blocking component being disposed between two or more adjacent cells among the plurality of cells, a module housing including a main board configured to support the cell assembly; at least one slit formed in the main board and arranged to face the at least one heat propagation blocking component; and a thermally conductive polymer disposed in the at least one slit. The melting point of the thermally conductive polymer may be lower than the melting point of the main board.

[0023] In an embodiment, the battery pack frame may include a heat sink configured to support the main board. The at least one slit may be located between the at least one heat propagation blocking component and the heat sink.

[0024] (III) Advantageous Effects

[0025] In embodiments of the disclosed technology, heat propagation between cells can be prevented or delayed. Description of the Drawings

[0026] The following detailed description with reference to the drawings shows certain aspects, features, and advantages of the disclosed technology.

[0027] Figure 1 is a perspective view of a cell based on an embodiment.

[0028] Figure 2 is a perspective view of a battery module based on an embodiment.

[0029] Figure 3 is an exploded perspective view of a battery module based on an embodiment.

[0030] Figure 4 is a schematic cross-sectional view of a battery module based on an embodiment.

[0031] Figure 5a is a schematic diagram for explaining the heat transfer path of a battery module in general based on an embodiment.Figure 5b It is a schematic diagram for explaining the heat transfer path of the battery module in the case of thermal runaway based on the embodiments.

[0032] Figure 6 It is a perspective view of the module housing based on the embodiments.

[0033] Figure 7a It is a top view of the module housing based on the embodiments. Figure 7b It is a rear view of the module housing based on the embodiments.

[0034] Figure 8 It is a rear view of the module housing based on another embodiment.

[0035] Figure 9 It is based on another embodiment Figure 4 of the enlarged view of area A.

[0036] Figure 10 It is based on yet another embodiment Figure 4 of the enlarged view of area A.

[0037] Figure 11 It is an exploded perspective view of the battery pack based on the embodiments.

[0038] Description of reference numerals:

[0039] 100: Battery cell

[0040] 101: Battery cell assembly

[0041] 150: Heat propagation blocking component

[0042] 200: Battery module

[0043] 210: Module housing

[0044] 212: Accommodating part

[0045] 213: Main board

[0046] 217: Chamber part

[0047] 220: Bus bar

[0048] 230: Slot

[0049] 240: Thermally conductive polymer

[0050] 300: Battery pack Detailed description of the specific embodiments

[0051] Now, various embodiments of the disclosed technology will be described in detail with reference to the accompanying drawings. These descriptions are merely examples, and the disclosed technology is not limited to the specific embodiments described in this patent document.

[0052] Secondary batteries are manufactured in various forms including flexible pouch-type battery cells or rigid prismatic or cylindrical can-type battery cells. A plurality of battery cells can be assembled in a stacked configuration to form a battery cell assembly.

[0053] The battery cell assembly can be enclosed in a housing to form a battery module, and a plurality of battery modules can be arranged inside a battery pack frame to form a battery pack. The battery pack can be used in structures such as vehicles or energy storage systems.

[0054] Figure 1 is a perspective view of a battery cell according to an embodiment.

[0055] Referring to Figure 1 , the battery cell 100 can include a pouch 110, an electrode assembly 120, and electrode tabs 130. In an embodiment, the battery cell 100 can be used as a secondary battery. For example, the battery cell 100 can be a lithium-ion battery, but is not limited thereto. Other examples of the battery cell 100 can include nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-hydrogen batteries, all of which support charging and discharging.

[0056] The pouch 110 can form at least a part of the exterior of the battery cell 100. The pouch 110 can include an electrode receiving portion 111 configured to receive the electrode assembly 120 and a sealing portion 115 configured to seal at least a part of the periphery of the electrode receiving portion 111. The electrode receiving portion 111 can provide space for the electrode assembly 120 and the electrolyte.

[0057] The sealing portion 115 can be formed by joining at least a part of the periphery of the pouch 110. The sealing portion 115 can have a flange shape extending outward from the electrode receiving portion 111 having a container shape, and can be provided along at least a part of the periphery of the electrode receiving portion 111. In one embodiment, the sealing portion 115 can include a first sealing portion 115a provided with the electrode tab 130 and a second sealing portion 115b not provided with the electrode tab 130. A part of the electrode tab 130 can extend to the outside of the pouch 110. In order to enhance the sealing degree of the first sealing portion 115a while ensuring an electrically insulated state at the position where the electrode tab 130 exits the pouch 110, the electrode tab 130 can be covered with an insulating film 140. The insulating film 140 can be made of a film material thinner than the electrode tab 130, and can be attached to two opposite surfaces of the electrode tab 130.

[0058] In one embodiment, the electrode tabs 130 may be disposed on two opposite sides in the length direction (e.g., the Y-axis direction) of the battery cell 100 and face opposite directions. For example, the electrode tabs 130 may include: a positive electrode tab 130a having a first polarity (e.g., positive electrode) and facing one side in the length direction of the battery cell 100; and a negative electrode tab 130b having a second polarity (e.g., negative electrode) and facing the other side in the length direction of the battery cell 100. In Figure 1 the illustrated embodiment, the sealing portion 115 may include two first sealing portions 115a where the electrode tabs 130 are disposed and one second sealing portion 115b where the electrode tabs 130 are not disposed. The electrode tabs 130 may be referred to as electrode leads.

[0059] The arrangement direction of the electrode tabs 130 can be designed flexibly. In one embodiment (e.g., Figure 1 ), the electrode tabs 130 may include a positive electrode tab 130a and a negative electrode tab 130b that is in the opposite direction of the positive electrode tab 130a with respect to the electrode assembly 120. In Figure 1 it, the electrode tabs 130 are shown on two opposite sides in the length direction (e.g., the Y-axis direction) of the battery cell 100 and face opposite directions, but the structure of the electrode tabs 130 is not limited thereto. For example, the two electrode tabs 130 may be arranged substantially parallel to each other in the length direction (e.g., the Y-axis direction) of the battery cell 100.

[0060] As Figure 1 shown, in the embodiment, the pouch 110 may be configured such that one outer packaging material is folded and the sealing portion 115 is formed on three sides. However, the disclosed technology is not limited to this structure.

[0061] In an embodiment of the disclosed technology, at least a part of the sealing portion 115 may be folded at least once. Folding at least a part of the sealing portion 115 can improve the bonding reliability of the sealing portion 115 and can minimize the area of the sealing portion 115. In the sealing portion 115 according to one embodiment, the second sealing portion 115b where the electrode tabs 130 are not disposed may be folded twice and then fixed by an adhesive member (not shown). The bending angle or the number of folds of the second sealing portion 115b can be changed. For example, in the embodiment, the second sealing portion 115b may be folded at a 90° angle with respect to the first sealing portion 115a.

[0062] The electrode assembly 120 may include a cathode plate, an anode plate, and a separator. The separator may prevent the cathode plate and the anode plate from contacting. In some embodiments, the electrode assembly 120 may be manufactured in various ways. In some exemplary embodiments, the positive electrode, the negative electrode, and the separator may be repeatedly arranged to form the electrode assembly. In some embodiments, the electrode assembly may be of a winding type, a stacking type, a z-folding type, or a stack-folding type.

[0063] Figure 1 The structure of the illustrated battery cell 100 is merely an example. For example, in Figure 1 , the battery cell 100 is described as a pouch-type battery cell, but the structure of the battery cell 100 is not limited thereto. For example, the battery cell 100 may be a cylindrical battery cell or a prismatic battery cell.

[0064] Figure 2 is a perspective view of a battery module based on an embodiment. Figure 3 is an exploded perspective view of a battery module based on an embodiment.

[0065] Referring to Figure 2 and / or Figure 3 , the battery module 200 may include a battery cell assembly 101 and a module housing 210.

[0066] The battery cell assembly 101 may include a plurality of battery cells 100 (e.g., the battery cells 100 of Figure 1 ) and at least one heat propagation blocking component 150 disposed between two or more adjacent battery cells 100 among the plurality of battery cells 100. The plurality of battery cells 100 and the heat propagation blocking component 150 may be stacked along a first direction (e.g., the X direction). The battery cells 100 and the heat propagation blocking component 150 may extend along a second direction (e.g., the Y axis direction) substantially perpendicular to the first direction (the X axis direction).

[0067] The module housing 210 may form at least a part of the appearance of the battery module 200 and may form an internal space S for accommodating the battery cell assembly 101 and / or the bus bar assembly 220.

[0068] The module housing 210 may include a receiving portion 212 that surrounds the bottom and side surfaces of the battery cell assembly 101. The receiving portion 212 may include a main board 213 that covers the bottom surface of the battery cell assembly 101 and side wall members 214 that extend from the main board 213. The main board 213 may support the battery cell assembly 101. The side wall members 214 may cover at least a portion of the side surfaces of the battery cell assembly 101. At least a portion of the internal space S may be surrounded by the main board 213, the side wall members 214, and the end plate 215. In one embodiment, the main board 213 and the side wall members 214 may be integrally formed.

[0069] The module housing 210 may include an end plate 215 that covers a portion of the side surface of the battery cell assembly 101. In one embodiment, the end plate 215 may be connected to an end of the receiving portion 212 in the longitudinal direction (e.g., the Y-axis direction). The end plate 215 may cover a portion of the side surface of the battery cell assembly 101 and at least a portion of the bus bar assembly 220.

[0070] The module housing 210 may include a module cover 211 that, together with the receiving portion 212 and / or the end plate 215, forms at least a portion of the appearance of the battery module 200. For example, the module cover 211 may be connected to the receiving portion 212 and / or the end plate 215 and may surround at least a portion of the battery cell assembly 101. The module cover 211 may be disposed on one side of the battery cell assembly 101 and may cover the battery cell assembly 101.

[0071] In an embodiment, the module housing 210 may be made of a material with high thermal conductivity such as metal. For example, the module housing 210 may be made of aluminum and / or stainless steel. However, the material of the module housing 210 is not limited thereto. The module housing 210 may be referred to as a housing, a casing, or a module casing.

[0072] The battery module 200 may include at least one slit 230 formed in the module housing 210. Examples of the structure of the slit 230 will be further described below.

[0073] The battery module 200 may include a bus bar assembly 220.

[0074] The bus bar assembly 220 may include a conductive bus bar 221 that is electrically connected to the electrode tab (e.g., Figure 1 the electrode tab 130 of ) of the battery cell 100 and a bus bar frame 222 that supports the bus bar. The bus bar assembly 220 may include at least one connection terminal 223 for electrically connecting to an external component. The electrode tab 130 of the battery cell 100 may be electrically connected to an external component outside the battery module 200 through the bus bar 221 and the connection terminal 223.

[0075] The battery module 200 may include an insulating cover 203 located between the end plate 215 and the bus bar assembly 220. The insulating cover 203 may prevent the bus bar 221 from contacting the end plate 215.

[0076] The battery module 200 may include a sensor assembly 205. The sensor assembly 205 may be connected to the bus bar assembly 220 and may transmit information (e.g., temperature and / or voltage) of the battery module 200 detected by the bus bar assembly 220 to external components outside the battery module 200. The sensor assembly 205 may include a temperature sensor, a voltage sensing terminal, and a substrate portion (e.g., a flexible printed circuit board). At least a part of the sensor assembly 205 may be located between the module cover 211 and the cell assembly 101.

[0077] The battery module 200 may include a heat insulating cover 207. The heat insulating cover 207 may protect components (e.g., the sensor assembly 205) of the battery module 200 from gases, flames, and / or conductive particles generated in the cell assembly 101. The heat insulating cover 207 may contain heat-resistant or fire-resistant materials (e.g., mica). The heat insulating cover 207 may be located between the module cover 211 and the cell assembly 101. For example, the heat insulating cover 207 may be disposed between at least a part (e.g., the substrate portion) of the sensor assembly 205 and the cell assembly 101.

[0078] For ease of description, specific components in the drawings are omitted or exaggerated. For example, the number of cells 100 and / or the shape of the bus bar assembly 220 may be selectively designed. In an embodiment, the battery module 200 may include a conductive component (e.g., a long bus bar) to adjust the position of the connection terminals of the bus bar assembly 220.

[0079] Figure 4 is a schematic cross-sectional view of a battery module based on an embodiment. Figure 5a is a schematic diagram for explaining the heat transfer path of a battery module in general based on an embodiment. Figure 5b is a schematic diagram for explaining the heat transfer path of a battery module in the case of thermal runaway based on an embodiment.

[0080] Referring to Figure 4 、 Figure 5a and / or Figure 5b , the battery module 200 may include a cell assembly 101, a module housing 210, and a thermally conductive polymer 240, wherein the cell assembly 101 includes cells 100 and a heat propagation blocking assembly 150. The descriptions of the Figure 2 and / or Figure 3 cells 100, heat propagation blocking assembly 150, cell assembly 101, and module housing 210 may be applicable to Figure 4 、 Figure 5a and / orFigure 5b the battery cell 100, the thermal propagation blocking component 150, the battery cell assembly 101, and the module housing 210.

[0081] At least a part of the heat generated in some of the plurality of battery cells 100 can be transferred to other battery cells 100. The battery cell assembly 101 may include a thermal propagation blocking component 150 to delay the thermal propagation between the plurality of battery cells 100. In one embodiment, the thermal propagation blocking component 150 may be referred to as a thermal barrier.

[0082] The thermal propagation blocking component 150 may include a heat insulation member 151. The heat insulation member 151 may block or reduce the thermal propagation between adjacent battery cells 100. For example, the heat insulation member 151 may include a heat insulating material (e.g., mica, silica wool, and / or silicone gel). In one embodiment, the heat insulation member 151 may be replaced with a material having heat resistance and heat insulation properties. In one embodiment, the heat insulation member 151 may maintain stable properties at a temperature of 800 °C or higher for a specified time.

[0083] The thermal propagation blocking component 150 may include a buffer member 152. The buffer member 152 may absorb at least a part of the expansion pressure caused by the swelling phenomenon of the battery cell 100. For example, the buffer member 152 may include at least one of polyurethane, silicone resin, or rubber. Due to the elastic force of the buffer member 152, a part of the battery cell 100 (e.g., Figure 1 the electrode accommodating portion 111) may be pressurized. Since the electrode accommodating portion 111 is pressurized, the swelling phenomenon of the battery cell 100 can be reduced.

[0084] The buffer member 152 may be disposed on the heat insulation member 151. For example, the buffer member 152 may cover at least a part of one side and the other side of the heat insulation member 151. In one embodiment, the thermal propagation blocking component 150 may include an adhesive layer 153. The adhesive layer 153 may be disposed between the heat insulation member 151 and the buffer member 152. The adhesive layer 153 may include an adhesive tape or other adhesive material. For example, the adhesive layer 153 may include an adhesive material such as a silicone resin-based material, an acrylic-based material, a rubber-based material, a hot melt-based material, an epoxy resin-based material, a pressure-sensitive adhesive (PSA)-based material, or a polyurethane-based material. However, the material of the adhesive layer 153 is not limited to these examples, as long as the material of the adhesive layer 153 can bond the heat insulation member 151 and the buffer member 152.

[0085] The battery cell assembly 101 can be accommodated within the module housing 210. For example, multiple battery cells 100 can each be disposed on the main board 213 of the accommodating portion 212 with the second sealing portion 115b facing the module cover 211. For example, the battery cell 100 can be thermally connected to the main board 213 using a thermally conductive adhesive.

[0086] At least a portion of the heat generated in some of the multiple battery cells 100 can be transferred through the accommodating portion 212 of the module housing 210 to other battery cells 100. For example, the multiple battery cells 100 can include a first battery cell 100a and a second battery cell 100b separated from the first battery cell 100a by a heat propagation blocking component 150. In one embodiment, the first battery cell 100a can be referred to as a trigger battery cell, and the second battery cell 100b can be referred to as an adjacent battery cell.

[0087] The accommodating portion 212 (e.g., the main board 213) can include at least one slit 230. The slit 230 can extend in a second direction (e.g., the Y-axis direction) substantially perpendicular to the first direction (e.g., the X-axis direction). In one embodiment, the battery module 200 can include multiple slits 230. The multiple slits 230 can be spaced apart from each other in the first direction (e.g., the X-axis direction).

[0088] The heat generated in the battery cell 100 can be transferred to other adjacent points. For example, at least a portion of the heat generated in the battery cell 100 can be transferred to the heat sink 301 through the first heat path H1. The heat sink 301 can be a battery pack (e.g., Figure 11 the battery pack frame 310) that supports the battery module 200. For example, the battery pack frame 310 can include the heat sink 301 that supports the main board 213. At least a portion of the heat generated in the battery cell 100 can flow along the accommodating portion 212 of the module housing 210 through the second heat path H2.

[0089] The slit 230 can reduce heat transfer through the accommodating portion 212 of the module housing 210. For example, in the main board 213 where the slit 230 is not formed, at least a portion of the heat generated in some of the multiple battery cells 100 (e.g., the first battery cell 100a) can be transferred through the main board 213 to other battery cells (e.g., the second battery cell 100b).

[0090] The slit 230 may be formed corresponding to the heat transfer blocking component 150. For example, the slit 230 may face at least a part of the heat transfer blocking component 150. The slit 230 may be formed below the heat transfer blocking component 150. For example, the slit 230 may be disposed between the heat sink 301 and the heat transfer blocking component 150. By aligning the slit 230 with at least a part of the heat transfer blocking component 150, the slit 230 may reduce heat transfer through the receiving portion 212 located at the lower part of the heat transfer blocking component 150. In one embodiment, the center line of the slit 230 may be substantially on the same line as the center line of the heat transfer blocking component 150.

[0091] The thermally conductive polymer 240 may be disposed within the slit 230. For example, in a normal state (e.g., Figure 5a ), since the thermally conductive polymer 240 is disposed within the slit 230, the rigidity of the module housing 210 (e.g., the receiving portion 212) may be increased. The normal state may refer to a state in which the plurality of battery cells 100 do not release flames and / or gases or the maximum temperature of the plurality of battery cells 100 is lower than a specified threshold temperature.

[0092] The thermally conductive polymer 240 may be referred to as a thermally conductive resin, a thermally conductive adhesive, or a heat transfer component. The thermally conductive polymer 240 may be a thermally conductive resin layer. For example, the thermal conductivity of the thermally conductive polymer 240 may be from 1 W / mK to 6 W / mK. Due to the thermal conductivity of the thermally conductive polymer as described above, heat dissipation of the battery module 200 may be performed together with the thermally conductive polymer 240 using the main board 213 in a normal state.

[0093] In one embodiment, the thermally conductive polymer 240 may include an adhesive including at least one of an acrylic resin, an epoxy resin, a polyurethane, or a silicone resin. The thermally conductive polymer 240 may include a thermally conductive filler including at least one of alumina, boron nitride, or silver.

[0094] In one embodiment, the thermally conductive polymer 240 may include a substance that has a residual amount of 40% to 60% at 800°C in a thermogravimetric analysis (TGA) in which the temperature is increased from room temperature to 1000°C at a rate of 20°C per minute.

[0095] In a normal state (e.g., Figure 5a ), the thermally conductive polymer 240 may be in contact (e.g., thermal contact) with the heat transfer blocking component 150 and / or the main board 213. The thermally conductive polymer 240 may disperse at least a part of the heat generated in the battery cells 100. For example, in a normal state in which the thermally conductive polymer 240 is not melted (e.g., Figure 5a), at least a part of the heat transferred to a part of the main board 213 can be transferred to other parts of the main board 213 through the thermally conductive polymer 240.

[0096] In one embodiment, the number of the slits 230 and the thermally conductive polymer 240 can be designed according to the number of unit cells in the battery cell assembly 101. For example, the number of the slits 230 and the thermally conductive polymer 240 can be the same as the number of the heat transfer blocking components 150 respectively. Since the thermally conductive polymer 240 is disposed in the slits 230, the rigidity of the accommodating portion 212 of the module housing 210 can be improved in a normal state (e.g., Figure 4 and Figure 5a ). Figure 4 and Figure 5a ).

[0097] The thermally conductive polymer 240 can melt in a thermal runaway state (e.g., Figure 5b ). For example, the melting point of the thermally conductive polymer 240 can be lower than the melting point of the main board 213. When the thermally conductive polymer 240 melts, the heat transferred to a part of the main board 213 located on one side of the slit 230 may no longer be transferred to other parts of the main board 213 located on the other side of the slit 230 through the thermally conductive polymer 240. Since the thermal conductivity of the empty space (e.g., air) formed by the slit 230 is lower than the thermal conductivity of the thermally conductive polymer 240, the transfer of heat generated in the first battery cell 100a to the second battery cell 100b can be reduced. For example, the thermal conductivity of the main board 213 having the melted thermally conductive polymer 240 can be lower than the thermal conductivity of the main board 213 provided with the thermally conductive polymer 240.

[0098] When the thermally conductive polymer 240 melts, the heat transfer between the battery cells 100 through the main board 213 can be reduced, and the heat transfer between the battery cells 100 can be delayed. For example, in the battery module 200 including the slits 230 and the thermally conductive polymer 240 disposed in the slits 230 implemented in an embodiment based on the disclosed technology, the heat transfer conducted through the main board 213 can be reduced. In the thermal runaway state of the battery module 200, the flow of thermal energy can be controlled to help prevent damage to the battery cells (e.g., the second battery cell 100b) adjacent to the battery cell (e.g., the first battery cell 100a) (or the triggering battery cell) where a fire occurs.

[0099] In an exemplary embodiment of the disclosed technology, in the battery module 200 including the slit 230 and the thermally conductive polymer 240, when a flame, gas, and / or conductive particles are released from the first battery cell 100a, the temperature of the second battery cell 100b separated from the first battery cell 100a by the heat transfer blocking component 150 can be maintained at about 25°C to 28°C within a specified time. In a comparative example battery module that does not include the slit 230 and the thermally conductive polymer 240 disposed within the slit 230, when a flame, gas, and / or conductive particles are released from the first battery cell 100a, the temperature of the second battery cell 100b separated from the first battery cell 100a by the heat transfer blocking component 150 can be maintained at about 70°C to 100°C within a specified time. Since the thermally conductive polymer 240 melts, heat transfer to the battery cells 100 separated by the heat dissipation diaphragm component 150 can be delayed, and thermal runaway and heat transfer within the battery module 200 can be delayed.

[0100] The slit 230 of the module housing 210 can be designed to correspond to the width of the heat transfer blocking component 150. For example, the second width W2 of the slit 230 can be less than the first width W1 of the heat transfer blocking component 150. In one embodiment, the second width W2 can be 50% to 90% of the first width W1 of the heat transfer blocking component 150.

[0101] Since the second width W2 of the slit 230 can be more than 50% of the first width W1 of the heat transfer blocking component 150, in the event that some of the multiple battery cells 100 catch fire, the heat transfer path between the multiple battery cells 100 can be blocked. For example, when the thermally conductive polymer 240 disposed within the slit 230 melts, an empty space that can reduce heat transfer is created. Additionally, by setting the second width W2 of the slit 230 to be less than 90% of the first width W1 of the heat transfer blocking component 150, the heat transfer blocking component 150 can be supported by the main board 213, improving the assembly convenience of the heat transfer blocking component 150.

[0102] Figure 6 is a perspective view of a module housing based on an embodiment. Figure 7a is a top view of a module housing based on an embodiment. Figure 7b is a rear view of a module housing based on an embodiment.

[0103] Referring to Figure 6 、 Figure 7a and / or Figure 7b , the accommodation part 212 can include a main board 213 formed with a slit 230 and a side wall member 214 extending from the main board 213. The description of the accommodation part 212 and the slit 230 of Figures 2 to 5b can be applicable to Figure 6 、 Figure 7a and / or Figure 7bThe receiving portion 212 and the slit 230.

[0104] The main board 213 may have a shape for supporting components of a battery module (e.g., Figure 3 the battery module 200). In one embodiment, the main board 213 may include a bus bar receiving groove 216 for accommodating a part (e.g., Figure 3 the bus bar frame 222) of a bus bar assembly (e.g.,

[0105] the bus bar assembly 220). The bus bar receiving groove 216 may be formed on the first surface 213a of the main board 213. Figure 3 The slit 230 may penetrate the main board 213. For example, the main board 213 may include a first surface 213a facing the cell assembly (e.g.,

[0106] the cell assembly 101) and a second surface 213b opposite to the first surface 213a. The slit 230 may be a through hole extending from the first surface 213a of the main board 213 to the second surface 213b.

[0107] In Figure 6 , Figure 7a and Figure 8 , a receiving portion 212 including four slits 230 is shown, but the number of slits 230 is not limited to this example. For example, the number of slits 230 may be designed according to Figure 4 the heat propagation blocking component 150.

[0108] Figure 8 is a rear view of a module housing based on another embodiment.

[0109] Referring to Figure 8 , the receiving portion 212 may include the main board 213 formed with the slit 230, and the slit 230 includes a plurality of slits 231, 232, 233, 234. The description of the receiving portion 212 and the slit 230 for Figure 6 , Figure 7a and Figure 7b may be applicable to the receiving portion 212 and the slit 230 of Figure 8 .

[0110] The slit 230 may be a plurality of slits 231, 232, 233, 234 arranged along a first direction (e.g., the X-axis direction). In an embodiment, each of the plurality of slits 231, 232, 233, 234 may form a plurality of through holes spaced apart from each other along a second direction (e.g., the Y-axis direction). For example, in one embodiment, the first slit 231 may include a plurality of through holes 231a, 231b, 231c, 231d spaced apart from each other along the second direction (e.g., the Y-axis direction). Since the slit 230 is formed as a plurality of through holes spaced apart along the second direction (e.g., the y-axis direction), the durability of the main board 213 can be improved.

[0111] Figure 8 The structure in which one slit (e.g., the first slit 231) includes four through holes is shown, but the number of through holes is not limited to this example.

[0112] Figure 9 is in another embodiment Figure 4 an enlarged view of region A of.

[0113] Referring to Figure 9 , the battery module 200 may include a battery cell 100, a heat propagation blocking component 150, a module housing (e.g., the main board 213), a slit 230, and a thermally conductive polymer 240.

[0114] For Figure 4 , 5a and / or the descriptions of the battery cell 100, the heat propagation blocking component 150, the battery module 200, the main board 213, the slit 230, and the thermally conductive polymer 240 in 5b may be applicable to Figure 9 the battery cell 100, the heat propagation blocking component 150, the battery module 200, the main board 213, the slit 230, and the thermally conductive polymer 240 of.

[0115] According to one embodiment, the main board 213 may include a chamfered portion 217. The chamfered portion 217 may be a part of the main board 213 that defines at least a part of the slit 230. In one embodiment, the chamfered portion 217 may be referred to as a part of the main board 213 that forms the slit 230 and protrudes at an angle. The slit 230 may be formed to be at least partially inclined, and the chamfered portion 217 may surround the slit 230.

[0116] The main board 213 may include a first surface 213a facing the battery cell 100, a second surface 213b opposite to the first surface 213a, and a third surface 213c extending from the first surface 213a to the second surface 213b. The third surface 213c may surround at least a part of the slit 230. The third surface 213c may extend in a direction inclined with respect to the first direction (e.g., the X-axis direction). The chamfered portion 217 may form at least a part of the third surface 213c. The second width W2 of the slit 230 may decrease as it approaches the battery cell 100 and / or the heat propagation blocking component 150. For example, the second width W2 of the slit 230 may gradually decrease from the lower part (e.g., the -Z direction) to the upper part (e.g., the +Z direction) of the battery module 200.

[0117] The main board 213 may support a part of the heat propagation blocking component 150. For example, the chamfered portion 217 of the main board 213 may contact and support the buffer member 152. The placement surface of the heat propagation blocking component 150 can be ensured through the chamfered portion 217. Since the placement surface of the heat propagation blocking component 150 is ensured, the assembly convenience of the heat propagation blocking component 150 can be improved.

[0118] The main board 213 may prevent the gas generated inside the battery module 200 from being discharged in an undesired direction. For example, the contact area between the heat propagation blocking component 150 and the main board 213 can be increased through the chamfered portion 217. Since the contact area between the heat propagation blocking component 150 and the main board 213 is increased, the gas generated in the battery cell 100 can be reduced or prevented from leaking to the outside of the battery module 200.

[0119] The heat-conductive polymer 240 may be formed corresponding to the shape of the slit 230. For example, the width of the heat-conductive polymer 240 may decrease as it approaches the battery cell 100 and / or the heat propagation blocking component 150.

[0120] Figure 10 is in another embodiment Figure 4 an enlarged view of area A.

[0121] Referring to Figure 10 , the battery module 200 may include a battery cell 100, a heat propagation blocking component 150, a module housing (e.g., the main board 213), a slit 230, a heat-conductive polymer 240, and a polymer block 250. For Figure 4 , 5a and / or the descriptions of the battery cell 100, the heat propagation blocking component 150, the battery module 200, the main board 213, the slit 230, and the heat-conductive polymer 240 in 5b may be applicable to Figure 10 the battery cell 100, the heat propagation blocking component 150, the battery module 200, the main board 213, the slit 230, and the heat-conductive polymer 240. In one embodiment, including Figure 10The battery module 200 of the polymer block 250 can be applicable to a battery module 200 including Figure 9 a chamfered portion 217.

[0122] In an embodiment, the polymer block 250 can be disposed within the slit 230. For example, in a normal state where no flame and / or gas is released from the battery cell 100 or the maximum temperature of the battery cell 100 is lower than a specified temperature, since the polymer block 250 is disposed within the slit 230, the rigidity of the module housing (e.g., the main board 213) can be increased.

[0123] In one embodiment, in a thermal runaway state where flame and / or gas is released from the battery cell 100 or the maximum temperature of the battery cell 100 is higher than or equal to the specified temperature, the polymer block 250 can melt. For example, the melting point of the polymer block 250 can be lower than the melting point of the main board 213. Regarding the melting of the polymer block 250, at least a part of the heat transferred to a part of the main board 213 located on one side of the slit 230 may not be transferred through the polymer block 250 to other parts of the main board 213 located on the other side of the slit 230. Since the thermal conductivity of the empty space (e.g., air) formed by the slit 230 is lower than the thermal conductivity of the polymer block 250, the heat generated in the first battery cell 100a transferred to the second battery cell 100b can be reduced.

[0124] At least a part of the polymer block 250 can be covered by a thermally conductive polymer 240. For example, in one embodiment, in a state where the polymer block 250 is disposed within the slit 230 formed in the main board 213, the thermally conductive polymer 240 can be coated on the slit 230 and / or the polymer block 250. In another example, the polymer block 250 coated with the thermally conductive polymer 240 can be inserted into the slit 230.

[0125] Since at least a part of the polymer block 250 and the thermally conductive polymer 240 can melt, the heat transfer between the battery cells 100 through the main board 213 can be reduced, and the heat propagation between the battery cells 100 can be delayed.

[0126] The polymer block 250 can be made of a material that melts in the thermal runaway state. For example, the polymer block 250 can include polypropylene.

[0127] In one embodiment, the polymer block 250 can be replaced with an insulating sheet. For example, the polymer block 250 can melt prior to the module housing 210, thereby reducing the thermal conductance of a part of the module housing 210 located below the heat propagation blocking component 150.

[0128] In an embodiment not shown, the thermal conductive polymer 240 may be replaced with a polymer block 250. For example, the battery module 200 may not include the thermal conductive polymer 240, but may include a polymer block 250 disposed within the slit 230.

[0129] Figure 11 is an exploded perspective view of a battery pack in an embodiment.

[0130] Referring Figure 11 , the battery pack 300 may include a plurality of battery modules 200 and a battery pack frame 310 that houses the plurality of battery modules 200. The foregoing description of the battery module 200 (e.g., Figures 2 to 10 ) may be applicable to Figure 11 the battery module 200.

[0131] The battery pack frame 310 may house components of the battery pack 300 (e.g., the battery module 200). The battery pack frame 310 may include a bottom member 311 that supports the battery module 200, a battery pack cover 312 that covers the battery module 200, and a battery pack sidewall 313 that surrounds at least a portion between the bottom member 311 and the battery pack cover 312. The bottom member 311 may support a receiving portion of the battery module 200 (e.g., Figure 2 the receiving portion 212).

[0132] The battery pack frame 310 may include a partition 320 that spans at least a portion of the plurality of battery modules 200. For example, the accommodation space of the battery pack frame 310 may be separated into a plurality of spaces by the partition 320. The partition 320 may be installed across the accommodation space to enhance the rigidity of the battery pack frame 310. In one embodiment, the partition 320 may include a first partition 320a that spans the plurality of battery modules 200 and a plurality of second partitions 320b that are substantially perpendicular to the first partition 320a.

[0133] In one embodiment, the battery pack 300 may include a duct member 330. The duct member 330 may include an exhaust space that provides a path for gases and / or flames discharged from the battery module 200. The duct member 330 may be disposed within the battery pack frame 310. The duct member 330 may surround at least a portion of the battery module 200. For example, gases and / or flames generated in the battery cells (e.g., Figure 1 the battery cells 100) of the battery module 200 may be transferred to the outside of the battery pack 300 through the exhaust space of the duct member 330. In the disclosed technology, the duct member 330 may be referred to as an exhaust duct or an exhaust component.

[0134] The battery pack 300 may include a battery control unit 390 for controlling the battery module 200. The battery control unit 390 may be disposed within the battery pack frame 310. The battery control unit 390 may include a battery management system (BMS). The configuration of the battery control unit 390 is known in various forms, and thus a detailed description thereof is omitted. In one embodiment, the battery control unit 390 may be referred to as a processor.

[0135] Figure 11 The structure of the battery pack 300 is merely an example. For example, the number of battery modules 200 included in the battery pack 300, the structure of the battery pack frame 310, and / or the pipe member 330 may all be selectively designed.

[0136] Only specific examples of the implementation manners of certain embodiments are described. Based on the disclosure of this patent document, variations, improvements, and enhancements may be made to the disclosed embodiments and other embodiments.

Claims

1. A battery module, comprising: A battery cell assembly, comprising a plurality of battery cells and at least one heat propagation blocking assembly, wherein the at least one heat propagation blocking assembly is disposed between two or more adjacent battery cells among the plurality of battery cells; A module housing, comprising a mainboard configured to support the battery cell assembly; at least one slit formed on the main board and arranged to face the at least one heat spread blocking component; as well as a thermally conductive polymer disposed within the at least one slit, The melting point of the thermally conductive polymer is lower than the melting point of the main board.

2. The battery module according to claim 1, wherein: The at least one heat transmission blocking member includes a heat insulating member and a buffer member configured to cover at least one side of the heat insulating member.

3. The battery module according to claim 2, wherein: The at least one slit faces the thermal insulation member, The main plate includes a chamfered portion configured to support the buffer member and define at least a portion of the at least one slit.

4. The battery module according to claim 1, wherein: The second width of the at least one slit is equal to or smaller than the first width of the at least one heat propagation blocking component.

5. The battery module according to claim 4, wherein: The second width is 50% to 90% of the first width.

6. The battery module according to claim 1, wherein: The thermally conductive polymer comprises an adhesive and a thermally conductive filler, wherein the adhesive comprises at least one of acrylic resin, epoxy resin, polyurethane and silicone resin, and the thermally conductive filler comprises at least one of aluminum oxide, boron nitride and silver.

7. The battery module according to claim 1, wherein: The thermal conductivity of the thermally conductive polymer is 1 W / mK to 6 W / mK.

8. The battery module according to claim 1, wherein: The plurality of battery cells are stacked along a first direction, The at least one heat spreading blocking member and the at least one slit extend in a second direction perpendicular to the first direction.

9. The battery module according to claim 8, wherein: The at least one slit includes a plurality of through holes spaced apart from each other along the second direction.

10. The battery module according to claim 1, further comprising: A polymer block is disposed within the at least one slit, and at least a portion of the polymer block is covered by the thermally conductive polymer.

11. The battery module according to claim 1, wherein: Each of the plurality of battery cells includes an electrode assembly, an electrode receiving portion configured to receive the electrode assembly, and a pouch including a sealing portion configured to seal at least a portion of a circumference of the electrode receiving portion.

12. The battery module according to claim 1, wherein: The module housing comprises: a receiving portion, comprising the main board in contact with the plurality of battery cells and the at least one heat propagation blocking component and a side wall member extending from the main board; an end plate covering a portion of the battery cell assembly; and A module cover covers the battery cell assembly and is connected to at least a portion of the accommodation portion and the end plate.

13. A battery module, comprising: A battery cell assembly, comprising a plurality of battery cells and a heat propagation blocking assembly, wherein the plurality of battery cells are stacked along a first direction, and the heat propagation blocking assembly is disposed between two or more adjacent battery cells among the plurality of battery cells and extends along a second direction perpendicular to the first direction; A module housing, accommodating the battery cell assembly; a slit formed on the module housing and arranged to face the heat propagation blocking component and extending along the second direction; as well as A thermally conductive polymer is disposed in the slit.

14. A battery pack comprising: Multiple battery modules; as well as a battery pack frame configured to accommodate the plurality of battery modules, Each of the plurality of battery modules comprises: A battery cell assembly comprises a plurality of battery cells and at least one heat propagation blocking assembly, wherein the at least one heat propagation blocking assembly is arranged between two or more adjacent battery cells among the plurality of battery cells, A module housing, comprising a mainboard configured to support the battery cell assembly; at least one slit formed on the main board and arranged to face the at least one heat spreading blocking component; and a thermally conductive polymer disposed within the at least one slit, The melting point of the thermally conductive polymer is lower than the melting point of the main board.

15. The battery pack according to claim 14, wherein: The battery pack frame includes a heat sink configured to support the main board, The at least one slit is located between the at least one heat propagation blocking component and the heat sink.

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