Battery pack for vehicle

Abstract

A battery pack for a vehicle includes: a plurality of battery modules disposed on a plane; a lower case that forms an accommodation space surrounding the lower and lateral sides of the plurality of battery modules; a battery pack cover plate coupled to the upper part of the lower case so as to cover the upper part of the accommodation space; a plurality of internal members provided in the accommodation space so as to separate the plurality of battery modules from each other; and a heat insulator provided between the battery pack cover plate and the internal member so as to thermally isolate the battery modules separated by the internal member.

Description

Technical Field

[0001] The present invention relates to a technology related to the structure of a battery pack mounted on a vehicle. Background Art

[0002] In electric vehicles or hybrid vehicles, batteries are installed to supply electric power to a drive motor that generates driving force for the vehicle, and are generally mounted on the vehicle body in the form of a battery pack that houses a plurality of battery modules composed of a plurality of battery cells.

[0003] The battery cells may catch fire due to various reasons. In this case, the flames may spread to adjacent battery cells and thermal runaway may occur.

[0004] Furthermore, as described above, a fire occurring in a certain battery module may spread to other adjacent battery modules and may develop into a thermal runaway phenomenon of the entire battery pack.

[0005] The contents described in the above background technology are only used to increase the understanding of the background of the present invention, and should not be understood as the prior art known to ordinary technicians in this technical field.

[0006] Prior art literature

[0007] Patent Literature

[0008] KR 10-2280326B1 Summary of the invention

[0009] An object of the present invention is to provide a battery pack for a vehicle, which is configured to structurally block the spread of flames to other adjacent battery modules when a fire occurs inside the battery pack, thereby effectively delaying heat transfer between battery modules and thermal runaway of the battery pack.

[0010] The vehicle battery pack of the present invention for achieving the above-mentioned purpose is characterized in that it includes: a plurality of battery modules arranged on a plane; a lower shell body forming a storage space surrounding the bottom and sides of the plurality of battery modules; a battery pack cover plate combined with the upper part of the above-mentioned lower shell body so as to cover the upper part of the above-mentioned storage space; a plurality of internal components arranged in the above-mentioned storage space in a manner of separating the plurality of battery modules; and a heat insulator arranged between the above-mentioned battery pack cover plate and the internal components so as to thermally isolate the battery modules separated by the above-mentioned internal components.

[0011] The above-mentioned lower shell can be configured to include a front wall, a rear wall, and two side walls connecting the two ends of the front wall and the rear wall along the front-to-back direction; the above-mentioned internal components include a longitudinal component extending along the front-to-back direction of the above-mentioned lower shell and a transverse component extending along the transverse direction of the above-mentioned lower shell, and the above-mentioned longitudinal component and the above-mentioned transverse component are arranged in a cross-shaped manner.

[0012] At least one of the front wall, the rear wall and the side walls of the lower housing may be provided with an exhaust device, and the exhaust device discharges waste gas generated in the accommodated battery module to the outside.

[0013] The heat insulator may extend along a length direction of the internal component and be disposed above the internal component.

[0014] The heat insulator may be formed by a channel portion of the battery pack cover formed by bending a portion of the battery pack cover itself downward toward the internal member.

[0015] The heat insulator may be formed by a blocking bracket coupled to the lower surface of the battery pack cover, wherein the blocking bracket includes a plurality of partitions extending along the length direction of the internal member in a state of protruding from the battery pack cover toward the internal member.

[0016] The blocking bracket may be formed in a trapezoidal cross-section shape, and both ends of the trapezoidal cross-section are combined with the lower surface of the battery pack cover plate.

[0017] The heat insulator may be formed of a blocking panel coupled to a lower surface of the battery pack cover, wherein the blocking panel includes a single partition extending along a longitudinal direction of the internal member in a state of protruding from the battery pack cover toward the internal member.

[0018] The heat insulator may be formed of a fire-blocking element disposed between the battery pack cover and the internal member, and an element guide for supporting the fire-blocking element may be disposed at least one of below the battery pack cover and above the internal member.

[0019] Among the internal members, the internal member on which the heat insulator is not provided may have a height lower than a module discharge port of the battery module.

[0020] The heat insulator may be formed by a heat-resistant pad disposed between the battery pack cover and the internal component; the heat-resistant pad is adhered to at least one side of the battery pack cover and the internal component.

[0021] The module discharge port of the battery module may be arranged toward the heat insulator, and the heat insulator may be divided at a portion corresponding to a portion between adjacent module discharge ports.

[0022] The battery module may include a module cover that covers the top of the stacked battery cells and forms a module discharge port that opens toward the heat insulator.

[0023] In addition, in order to achieve the above-mentioned purpose, the vehicle battery pack of the present invention is characterized in that it includes: a front wall, a rear wall and two side walls, the front wall, the rear wall and the two side walls form a storage space for accommodating multiple battery modules; a longitudinal member, which is arranged between the front wall and the rear wall to divide the above-mentioned storage space; a transverse member, which is arranged between the two side walls to divide the above-mentioned storage space; a battery pack cover, which is combined with the upper part of the front wall, the rear wall and the two side walls to cover the upper part of the above-mentioned storage space; multiple battery modules are arranged in the storage space divided by the longitudinal members and the transverse members, wherein the battery module has a module cover, the module cover covers the upper part of the stacked battery units and forms a module discharge port connected to the above-mentioned storage space, and the battery pack cover has a protrusion protruding downward toward the above-mentioned storage space.

[0024] The module discharge port formed on the module cover of the battery module may be arranged to face the protruding portion of the battery pack cover.

[0025] The protrusion of the battery pack cover may be formed in at least one of a shape extending toward the front wall and the rear wall or a shape extending toward the side walls.

[0026] The protrusion of the battery pack cover may extend above the longitudinal member or the transverse member along the length direction of the longitudinal member or the transverse member so as to restrict the mutual movement of gases on both sides of the protrusion.

[0027] The battery module is configured such that a plurality of battery cells are stacked between two end plates on both sides; and sensing modules are arranged on the front and rear sides of the two end plates so as to form an electrical connection between the battery cells and detect the voltage; the module cover plate covers the top of the stacked battery cells and is combined with the end plates or the sensing modules so as to limit heat transfer to the outside of the battery module; a fire-resistant panel is arranged between the battery cells, and the fire-resistant panel extends toward the lower surface of the module cover plate so as to delay heat transfer between the battery cells.

[0028] The fire-resistant panel may form a plane perpendicular to the module discharge port of the module cover plate and be disposed between the battery cells.

[0029] The upper portion of the fire-resistant panel may be formed with a communication groove partially spaced apart from the lower surface of the module cover.

[0030] The present invention can structurally block the flame from spreading to other adjacent battery modules when a fire occurs inside the battery pack, thereby effectively delaying heat transfer between battery modules and thermal runaway of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 : is a diagram showing a battery pack for a vehicle according to the present invention.

[0032] Figure 2 is a more detailed description Figure 1 Diagram of the battery pack structure.

[0033] Figure 3 is shown to be accommodated in Figure 1 Diagram of the structure of a battery module in a battery pack.

[0034] Figure 4 is a diagram showing a first battery module.

[0035] Figure 5 is along Figure 4 Cross-sectional view obtained along the F5-F5 line in FIG.

[0036] Figure 6 is along Figure 4 Cross-sectional view obtained along the F6-F6 line in FIG.

[0037] Figure 7 is a diagram schematically showing a second battery module.

[0038] Figure 8 is along Figure 7 Cross-sectional view obtained along the F8-F8 line in FIG.

[0039] Fig. 9 is along Figure 7 Cross-sectional view obtained along the F9-F9 line.

[0040] Fig.10 is a diagram showing a battery pack accommodating a first battery module.

[0041] Fig.11 is along Fig.10 Cross-sectional view obtained along the F11-F11 line.

[0042] Fig.12 is a diagram showing a battery pack accommodating a second battery module.

[0043] Fig.13 is along Fig.12 Cross-sectional view obtained along the F13-F13 line.

[0044] Fig.14 It is a diagram showing a first embodiment of a heat insulator.

[0045] Fig.15 Yes Fig.14 The battery pack cover is flipped over to show the diagram.

[0046] Fig.16 It is a diagram showing a second embodiment of the heat insulator.

[0047] Fig.17 Yes Fig.16 The battery pack cover is flipped over to show the diagram.

[0048] Fig.18 It is a diagram showing a third embodiment of the heat insulator.

[0049] Fig.19 Yes Fig.18 The battery pack cover is flipped over to show the diagram.

[0050] Fig. 20 It is a diagram for explaining a fourth embodiment of the heat insulator.

[0051] Fig.21 It is a figure explaining the 5th Example of a heat insulator.

[0052] Fig. 22 and Fig.23 The figures respectively show examples in which the heat insulator is divided.

[0053] Description of Reference Numerals

[0054] 1: Battery Pack

[0055] 3: Lower shell

[0056] MD: Battery Module

[0057] 7: Battery pack cover

[0058] 9: Lower the board

[0059] 11: Metal Plate

[0060] 13: Anterior wall

[0061] 15: Back wall

[0062] 17: Sidewall

[0063] S: Accommodation space

[0064] 19: Internal components

[0065] 21: End plate

[0066] 23: Battery Cell

[0067] 25: Induction module

[0068] CV: Module Cover

[0069] CV1: First module cover

[0070] CV2: Second module cover

[0071] 27: Module outlet

[0072] 29: Insulation

[0073] 31: Longitudinal member

[0074] 33: Transverse member

[0075] 37: Exhaust

[0076] 39: Channel Department

[0077] 41: Blocking stent

[0078] 43: Blocking Panel

[0079] 45: Fire-blocking element

[0080] 47: Component guide

[0081] 49: Heat-resistant pad

[0082] 51: Fire-resistant panel

[0083] 53: Module front cover

[0084] 55: Module back cover

[0085] 57: Lower bracket

[0086] 59: Connecting groove. DETAILED DESCRIPTION

[0087] Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings. In the present specification, the same or similar elements are denoted by the same reference numerals in any drawing and repeated description thereof will be omitted.

[0088] The suffixes "module" and "unit" for the elements used in the following description are only added or mixed for the convenience of writing the specification, and they themselves do not have a special meaning or function. When describing the embodiments of this specification, when it is judged that a specific description of a known related art may obscure the key points of the embodiments included in this specification, its detailed description will be omitted. In addition, it should be understood that the drawings are only used to easily understand the embodiments disclosed in this specification, the technical ideas included in this specification are not limited by the drawings, and all variations, equivalent embodiments and even alternative embodiments of the embodiments disclosed in the specification are included in the ideas and technical scope of the present invention. Terms such as first and second can be used to describe each element, but the elements are not limited by the above terms. The above terms are used only for the purpose of distinguishing one element from other elements.

[0089] When a certain element is described as being "connected" or "contacting" another element, it should be understood that it may be directly connected or indirectly connected to the other element, or there may be other elements in between. On the contrary, when a certain element is described as being "directly connected" or "directly contacting" another element, it should be understood that there are no other elements in between.

[0090] Unless the context clearly indicates a different meaning, the singular expression includes the plural expression. In this specification, terms such as "include" or "have" are intended to indicate the existence of the implementation features, numbers, steps, operations, parts, elements or their combinations described in the specification, and are not to be understood as excluding the existence or other possibilities of one or more other features, numbers, steps, operations, parts, elements or their combinations in advance.

[0091] Figure 1 1 is a diagram showing a vehicle battery pack 1 according to the present invention, in which a plurality of battery modules MD are accommodated in a lower shell 3 at the bottom. When combined with a battery pack cover 7 at the top, the battery pack cover 7 and the lower shell 3 together form a storage space capable of accommodating and protecting the internal battery modules MD.

[0092] Figure 2 is a more detailed description Figure 1 In the diagram of the structure of the battery pack 1, a front wall 13, a rear wall 15 and a side wall 17 are combined above the lower plate 9 and the metal plate 11 to form a storage space S for accommodating the above-mentioned battery module MD, and a plurality of internal components 19 are arranged in a manner to separate the accommodated battery modules MD.

[0093] Figure 3 Yes Figure 1 The decomposed structure of the battery module MD accommodated in the battery pack 1 is described. A plurality of battery cells 23 are stacked between two end plates 21. Induction modules 25 are provided in front of and behind the battery module MD. The induction modules 25 form an electrical connection between the battery cells 23 and are used to measure voltage, etc.

[0094] For reference, two types of battery modules MD are mentioned in the present invention, namely, a first battery module MD1 and a second battery module MD2 , which are distinguished by an upper module cover CV.

[0095] Figure 3 Although one battery module MD is shown in exploded form, the module cover CV is shown together with a first module cover CV1 and a second module cover CV2 for mutual comparison.

[0096] That is, Figures 4 to 6As shown, the first battery module MD1 is configured to have the above-mentioned first module cover CV1, the two side ends of the module cover CV are combined with two end plates 21, and a module outlet 27 is formed between the front and rear of the module cover CV and the above-mentioned sensor module 25.

[0097] In addition, if Figures 7 to 9 As shown, the second battery module MD2 is configured to have the above-mentioned second module cover CV2, the front and rear ends of the module cover CV are combined with the sensing module 25, and a module outlet 27 is formed between the two sides of the module cover CV and the above-mentioned end plate 21.

[0098] Reference Figures 1 to 21 The vehicle battery pack 1 of the present invention includes: a plurality of battery modules MD arranged on a plane; a lower shell 3 forming a storage space S surrounding the bottom and sides of the plurality of battery modules MD; a battery pack cover 7 combined with the upper part of the lower shell 3 so as to cover the upper part of the storage space S; a plurality of internal components 19 arranged in the storage space S in a manner of separating the plurality of battery modules MD; and a heat insulator 29 arranged between the battery pack cover 7 and the internal components 19 so as to thermally isolate the battery modules separated by the internal components 19.

[0099] That is, the battery pack 1 of the present invention is configured to accommodate a plurality of battery modules MD in a storage space S formed by the lower shell 3 and the battery pack cover 7, and is provided with a plurality of internal components 19 for ensuring the rigidity of the battery pack 1. The plurality of internal components 19 separate and support the battery modules MD accommodated in the storage space S, and the heat insulator 29 is provided between the battery pack cover 7 and the internal components 19, so that even in the event of a fire in a certain battery module MD, the fire can be effectively suppressed from spreading to other adjacent battery modules MD.

[0100] The above-mentioned lower shell 3 is configured to include a front wall 13, a rear wall 15 and two side walls 17 connecting the two ends of the front wall 13 and the rear wall 15 along the front-to-back direction; the above-mentioned internal component 19 includes a longitudinal component 31 extending along the front-to-back direction of the above-mentioned lower shell 3 and a transverse component 33 extending along the transverse direction of the above-mentioned lower shell, and the longitudinal component 31 and the transverse component 33 are arranged in a cross-shaped manner.

[0101] The above-mentioned lower shell 3 can have a metal plate 11 that will not melt even if a fire occurs in the battery module MD. The metal plate 11 is combined with the bottom of the front wall 13, the rear wall 15 and the side walls 17 on both sides to support the bottom of the above-mentioned battery module MD. The bottom of the above-mentioned metal plate 11 can overlap and combine with the lower plate 9.

[0102] Furthermore, a TIM (Thermal interface material) pad 35 may be provided above the metal plate 11 of the lower case 3 to facilitate heat transfer between the battery module MD and the metal plate 11 .

[0103] Although not shown in the drawings, a cooling passage or the like through which a coolant for cooling the battery module MD flows may be disposed below the metal plate 11 .

[0104] At least one of the front wall 13 , the rear wall 15 and the side walls 17 of the lower housing 3 may be provided with an exhaust device 37 , and the exhaust device 37 discharges exhaust gas generated in the accommodated battery module MD to the outside.

[0105] For reference, Figure 1 and Figure 2 2 shows an example in which the exhaust device 37 is provided on the front wall 13 and the rear wall 15. The exhaust device 37 can be formed by a valve device or the like that can prevent moisture or foreign matter from entering the interior of the battery pack 1 under normal circumstances, and can discharge the exhaust gas released from the battery cell 23 to the outside when a fire occurs in the battery module MD inside. The heat insulator 29 extends along the longitudinal direction of the internal member 19 and is provided above the internal member 19.

[0106] The battery pack 1 of the embodiment of the present invention can be Fig.10 The configuration shown is to accommodate only the first battery module MD1, and can also be as Fig.12 The configuration shown is to accommodate only the second battery module MD2.

[0107] exist Fig.10 and Fig.11 In the case of the embodiment, the module outlet 27 of the first battery module MD1 is open in the front-rear direction, so the heat insulator 29 is only arranged above the transverse member 33 in the internal member 19, and is not arranged above the longitudinal member 31.

[0108] On the other hand, Fig.12 and Fig.13 In the case of the embodiment, the module outlet 27 of the second battery module MD2 is opened laterally, so the heat insulator 29 is only arranged above the longitudinal member 31 in the internal member 19, and is not arranged above the transverse member 33.

[0109] That is, the heat insulator 29 is selectively provided only at a position where the exhaust gas discharged from the module outlet 27 of the battery module MD can be blocked.

[0110] The height of the internal member 19 on which the heat insulator 29 is not provided is preferably lower than the module outlet 27 of the battery module MD so that the exhaust gas can flow smoothly.

[0111] That is, in Fig.10 and Fig.11 In the case of the embodiment, the heat insulator 29 is only provided above the transverse member 33, so the longitudinal member 31 has a height below the module outlet 27 of the first battery module MD1; Fig.12 and Fig.13 In the case of the embodiment, the heat insulator 29 is provided only above the longitudinal member 31, so the transverse member 33 has a height below the module outlet 27 of the second battery module MD2.

[0112] exist Fig.10 and Fig.11 In the case of the embodiment, the above-mentioned heat insulator 29 is arranged along the entire length of the above-mentioned cross member 33. Fig.12 and Fig.13 In the case of the embodiment, the heat insulator 29 is arranged along the entire length of the longitudinal member 31, but on the contrary, it can also be as follows Fig. 22 and Fig.23 As shown, the above-mentioned heat insulator 29 is divided and arranged.

[0113] That is, the heat insulator 29 may be provided in a divided form at a portion corresponding to between the adjacent module discharge ports 27 .

[0114] exist Fig. 22 In the example of FIG. 1 , the heat insulator 29 provided above the cross member 33 is arranged to be divided at a portion corresponding to between the module outlets 27 of the first battery modules MD1 adjacent to each other.

[0115] exist Fig.23 In the example of , the heat insulator 29 provided above the vertical member 31 is configured to be divided at a portion corresponding to between the module discharge ports 27 of the second battery modules MD2 adjacent to each other.

[0116] In the case where the heat insulator 29 divided as described above is provided, the exhaust gas can flow through the divided portions of the heat insulator 29, so that the exhaust gas can be discharged more quickly.

[0117] Among them, when the above-mentioned insulator 29 is divided as described above, it is preferred that the length of the divided insulator 29 is more than 90% of the width of the module exhaust port 27, so as to ensure the blocking effect of the exhaust gas discharged from the above-mentioned module exhaust port 27 and reduce the flow resistance of the exhaust gas.

[0118] The heat insulator 29 may be Fig.14 and Fig.15 As shown, the channel portion 39 of the battery pack cover is formed by bending a portion of the battery pack cover 7 itself downward toward the inner member 19 .

[0119] That is, by bending the portion of the battery pack cover 7 located above the internal component 19 downward, a channel portion 39 is formed that protrudes downwardly from the battery pack cover 7 as shown in the figure, whereby the channel portion 39 together with the internal component 19 thermally isolates the battery modules MD arranged on both sides of the internal component 19.

[0120] Thermally isolating the battery modules MD means that when a fire occurs in the battery cells 23 constituting a battery module MD on one side and heat and exhaust gas are released, heat is prevented from being transferred to an adjacent battery module MD through convection, conduction or radiation.

[0121] As in the present embodiment, when the channel portion 39 integrally formed with the battery pack cover 7 plays the role of the heat insulator 29, if the channel portion 39 protrudes to be very close to the upper surface of the internal component 19, the transfer of heat based on convection, conduction and radiation can be completely blocked.

[0122] Reference Fig.16 and Fig.17 The above-mentioned insulator 29 can be configured to be formed by a blocking bracket 41 combined with the lower surface of the above-mentioned battery pack cover 7, and the blocking bracket 41 includes a plurality of partitions, and the plurality of partitions are extended along the length direction of the above-mentioned internal component 19 in a state of protruding from the above-mentioned battery pack cover 7 toward the internal component 19.

[0123] The blocking bracket 41 may be formed into a trapezoidal cross-section shape, and both ends of the trapezoidal cross-section are connected to the lower surface of the battery pack cover 7 by welding or the like.

[0124] In this case, the blocking bracket 41 can not only completely block the heat transfer based on convection, conduction and radiation between adjacent battery modules MD similar to the channel portion 39, but can also be applied to the situation where it is difficult to process the channel portion 39 on the battery pack cover 7, and is more advantageous in ensuring the rigidity of the battery pack 1.

[0125] Reference Fig.18 and Fig.19 The above-mentioned insulator 29 can be formed by a blocking panel 43 combined with the lower surface of the above-mentioned battery pack cover 7, and the blocking panel 43 is configured with a single partition wall extending along the length direction of the above-mentioned internal component 19 in a state of protruding from the above-mentioned battery pack cover 7 toward the internal component 19.

[0126] In this case, the upper end of the blocking panel 43 may be combined with the lower surface of the battery pack cover 7 by welding or the like.

[0127] The blocking panel 43 can not only completely block heat transfer between adjacent battery modules MD by convection, conduction and radiation, but can also be applied in the case where it is difficult to process the channel portion 39 on the battery pack cover 7 .

[0128] Furthermore, when there is insufficient space between two adjacent battery modules MD or when other components exist above the internal member 19 , the blocking panel 43 is useful in avoiding interference with these components.

[0129] The heat insulator 29 may be formed by a flame arrestor element 45 disposed between the battery pack cover 7 and the internal member 19 .

[0130] Fig. 20 In the example where the fire-blocking element 45 is provided as the heat insulator 29 , it is preferred that an element guide 47 for supporting the fire-blocking element 45 be provided at least one of below the battery pack cover 7 and above the internal member 19 .

[0131] The flame-blocking element 45 is configured to be formed of an iron mesh or porous sintered metal that allows gas flow, and can quickly absorb heat over a large area to extinguish the flame when the combustion gas passes through.

[0132] In this case, the heat insulator 29 formed by the flame-blocking element 45 can effectively block heat transfer between the battery modules MD based on convection, conduction, and radiation.

[0133] The heat insulator 29 may be formed by a heat-resistant pad 49 disposed between the battery pack cover 7 and the internal member 19 .

[0134] Fig.21 An example in which a heat-resistant mat 49 is used as the heat insulator 29 is shown.

[0135] The heat-resistant pad 49 can be adhered to at least one side of the battery pack cover 7 and the internal component 19 by adhesive or the like. Preferably, when the battery pack cover 7 is combined with the lower shell 3, an appropriate amount of compression is applied between the battery pack cover 7 and the internal component 19 to make the fixation at this position more secure.

[0136] On the other hand, the battery module MD includes a module cover CV that covers the upper sides of the stacked battery cells 23 and forms a module outlet 27 that opens toward the heat insulator 29 .

[0137] That is, refer to Fig.10and Fig.11 The first battery module MD1, which is one of the battery modules MD, has a module discharge port 27 in the front-to-rear direction. The heat insulator 29 is disposed above the transverse member 33, so the module discharge port 27 of the first battery module MD1 opens toward the heat insulator 29 above the transverse member 33.

[0138] Therefore, when a fire occurs in a first battery module MD1, causing exhaust gas and heat to be discharged through the module exhaust port 27, the exhaust gas and heat will be blocked by the insulator 29 above the cross member 33, so that the fire will not spread to other adjacent first battery modules MD1.

[0139] That is, Fig.10 As shown, in the case of the battery pack 1 accommodating the first battery modules MD1 , when exhaust gas is generated from each first battery module MD1 , the exhaust gas moves along the path indicated by the arrows and is discharged to the outside of the battery pack 1 through the exhaust device 37 .

[0140] In addition, refer to Fig.12 and Fig.13 The second battery module MD2, which is another type of the above-mentioned battery module MD, has a module discharge port 27 in the horizontal direction. The above-mentioned insulator 29 is arranged above the longitudinal member 31, so the module discharge port 27 of the above-mentioned second battery module MD2 opens toward the insulator 29 above the above-mentioned longitudinal member 31.

[0141] Therefore, if a fire occurs in a second battery module MD2, causing exhaust gas and heat to be discharged through the module exhaust port 27, the exhaust gas and heat will be blocked by the insulator 29 above the longitudinal member 31, so that the fire will not spread to other adjacent second battery modules MD2.

[0142] That is, Fig.12 As shown, in the case of the battery pack 1 accommodating the second battery modules MD2 , when exhaust gas is generated from each second battery module MD2 , the exhaust gas moves along the path indicated by the arrow and is discharged to the outside of the battery pack 1 through the above-mentioned exhaust device 37 .

[0143] The present invention as described above can be described as follows.

[0144] That is, the vehicle battery pack 1 of the present invention is configured to include: a front wall 13, a rear wall 15 and two side walls 17 that form a storage space S for accommodating multiple battery modules MD; a longitudinal member 31 arranged between the above-mentioned front wall 13 and the rear wall 15 to divide the above-mentioned storage space S; a transverse member 33 arranged between the above-mentioned two side walls 17 to divide the above-mentioned storage space S; a battery pack cover 7 combined with the upper part of the above-mentioned front wall 13, the rear wall 15 and the two side walls 17 to cover the upper part of the above-mentioned storage space S; and the above-mentioned multiple battery modules MD arranged in the storage space S divided by the above-mentioned longitudinal member 31 and the transverse member 33.

[0145] In addition, the battery module has a module cover CV, which covers the top of the stacked battery cells 23 and forms a module outlet 27 communicating with the storage space S. The battery pack cover 7 has a protrusion protruding downward toward the storage space S.

[0146] The protruding portion corresponds to the heat insulator 29 .

[0147] The module outlet 27 formed in the module cover CV of the battery module MD is arranged to face the protruding portion of the battery pack cover 7 .

[0148] The protrusion of the battery pack cover 7 may be formed in at least one of a shape extending toward the front wall 13 and the rear wall 15 and a shape extending toward the side walls 17 .

[0149] The protrusion of the battery pack cover 7 may extend above the longitudinal member 31 or the transverse member 33 along the length direction of the longitudinal member 31 or the transverse member 33 to limit the mutual movement of gases on both sides of the protrusion.

[0150] The battery module MD is configured such that a plurality of battery cells 23 are stacked between two end plates 21 on both sides; sensing modules 25 are provided on the front and rear sides of the two end plates 21 so as to form an electrical connection between the battery cells 23 and detect the voltage; the module cover CV covers the top of the stacked battery cells 23 and is combined with the end plates 21 or the sensing modules 25 so as to limit the heat transfer to the outside of the battery module MD; a fire-resistant panel 51 is provided between the battery cells 23, and the fire-resistant panel 51 extends toward the lower surface of the module cover CV so as to delay the heat transfer between the battery cells 23.

[0151] For reference, Figure 3 Also shown are a module front cover 53 and a module rear cover 55 disposed on the outside of the sensing module 25 , and a lower bracket 57 disposed below the battery unit 23 and the end plate 21 to connect and fix the two end plates 21 to each other.

[0152] exist Figures 4 to 6 In the first battery module MD1 shown, the fire-resistant panel 51 forms a plane perpendicular to the module outlet 27 of the module cover CV and is disposed between the battery cells 23 .

[0153] Therefore, when a fire occurs in a battery cell 23 and waste gas is generated, the waste gas can be discharged smoothly to the module exhaust port 27 along the channel formed between the fire-resistant panel 51 and the module cover CV and the battery cell 23, thereby effectively preventing the fire from spreading to adjacent battery cells 23.

[0154] exist Figures 7 to 9 In the second battery module MD2 shown, the fire-resistant panel 51 is configured such that a communication groove 59 partially separated from the lower surface of the module cover CV is formed on the upper portion.

[0155] Therefore, when exhaust gas is generated in a certain part of the battery unit 23 , the exhaust gas moves through the connecting groove 59 and is discharged to the module exhaust port 27 , thereby effectively delaying the spread of fire to other parts of the battery unit 23 .

[0156] Of course, in order to easily discharge the exhaust gas through the communication grooves 59 as described above, the communication grooves 59 of the fire-resistant panel 51 provided in the second cell module MD2 are preferably arranged in a manner that communicates with each other along the lateral direction of the second cell module MD2.

[0157] For reference, it can be understood that arrows without other marks in the figure represent the flow of exhaust gas exhausted when a fire or the like occurs in the battery cell 23 .

[0158] The above detailed description is an example of the preferred embodiments of the present invention. However, it is obvious to those skilled in the art that the present invention can be variously modified and improved without departing from the technical concept and scope of the present invention.

Claims

1. A battery pack for a vehicle, characterized in that: include: A plurality of battery modules are arranged on a plane; A lower housing, which forms a receiving space surrounding the bottom and sides of the plurality of battery modules; A battery pack cover plate, which is combined with the upper part of the lower shell so as to cover the upper part of the accommodation space; a plurality of internal components, which are arranged in the accommodation space in a manner of separating the plurality of battery modules; A heat insulator is disposed between the battery pack cover and the internal member so as to thermally insulate the battery modules separated by the internal member.

2. The vehicle battery pack according to claim 1, characterized in that: The lower shell is configured to include a front wall, a rear wall, and two side walls connecting the two ends of the front wall and the rear wall along the front-to-back direction; The inner member includes a longitudinal member extending along the front-rear direction of the lower shell and a transverse member extending along the transverse direction of the lower shell, and the longitudinal member and the transverse member are arranged in a manner of crossing each other.

3. The vehicle battery pack according to claim 2, characterized in that: At least one of the front wall, the rear wall and the side walls of the lower housing is provided with an exhaust device, and the exhaust device discharges waste gas generated in the accommodated battery module to the outside.

4. The vehicle battery pack according to claim 1, characterized in that: The heat insulator extends along the length direction of the internal component and is disposed above the internal component.

5. The vehicle battery pack according to claim 4, characterized in that: The heat insulator is formed by a channel portion of the battery pack cover formed by bending a portion of the battery pack cover itself downward toward the internal member.

6. The vehicle battery pack according to claim 4, characterized in that: The heat insulator is formed by a blocking bracket coupled to the lower surface of the battery pack cover, and the blocking bracket includes a plurality of partitions extending along the length direction of the internal member in a state of protruding from the battery pack cover toward the internal member.

7. The vehicle battery pack according to claim 6, characterized in that: The blocking bracket is formed in a trapezoidal cross-section shape, and both ends of the trapezoidal cross-section are combined with the lower surface of the battery pack cover plate.

8. The vehicle battery pack according to claim 4, characterized in that: The heat insulator is formed of a blocking panel coupled to the lower surface of the battery pack cover, and the blocking panel is provided with a single partition wall extending along the longitudinal direction of the internal member in a state of protruding from the battery pack cover toward the internal member.

9. The vehicle battery pack according to claim 4, characterized in that: The heat insulator is formed by a fire-blocking element disposed between the battery pack cover and the internal components, An element guide for supporting the flame-blocking element is provided at least one of below the battery pack cover and above the internal member.

10. The vehicle battery pack according to claim 4, characterized in that: Among the internal members, the internal member on which the heat insulator is not provided has a height below the module discharge port of the battery module.

11. The vehicle battery pack according to claim 4, characterized in that: The heat insulator is formed by a heat-resistant pad disposed between the battery pack cover and the internal member; The heat-resistant pad is attached to at least one side of the battery pack cover and the internal member.

12. The vehicle battery pack according to claim 4, characterized in that: The module discharge port of the battery module is arranged toward the heat insulator, The heat insulator is divided at a portion corresponding to between the discharge ports of adjacent modules.

13. The vehicle battery pack according to claim 2, characterized in that: The battery module includes a module cover plate that covers the upper side of the stacked battery cells and forms a module discharge port that opens toward the heat insulator.

14. A battery pack for a vehicle, characterized in that: include: A front wall, a rear wall and two side walls, wherein the front wall, the rear wall and the two side walls form a storage space for accommodating a plurality of battery modules; A longitudinal member disposed between the front wall and the rear wall to divide the accommodation space; A transverse member, which is arranged between the two side walls to divide the accommodation space; A battery pack cover plate, which is combined with the upper part of the front wall, the rear wall and the side walls on both sides to cover the upper part of the accommodation space; as well as A plurality of battery modules are arranged in the accommodation space divided by the longitudinal members and the transverse members, The battery module has a module cover, which covers the top of the stacked battery cells and forms a module discharge port communicating with the accommodation space. The battery pack cover plate has a protrusion protruding downward toward the accommodation space.

15. The vehicle battery pack according to claim 14, characterized in that: The module discharge port formed on the module cover of the battery module is arranged to face the protruding portion of the battery pack cover.

16. The vehicle battery pack according to claim 14, characterized in that: The protrusion of the battery pack cover is formed in at least one of a shape extending toward the front wall and the rear wall or a shape extending toward the two side walls.

17. The vehicle battery pack according to claim 14, characterized in that: The protrusion of the battery pack cover extends above the longitudinal member or the transverse member along the length direction of the longitudinal member or the transverse member so as to limit the mutual movement of gases on both sides of the protrusion.

18. The vehicle battery pack according to claim 14, characterized in that: The battery module is configured as follows: A plurality of battery cells are stacked between two end plates on both sides; Sensing modules are arranged on the front and rear sides of the two end plates so as to form an electrical connection between the battery cells and detect voltage; The module cover plate covers the upper side of the stacked battery cells and is combined with the end plate or the induction module to limit heat transfer to the outside of the battery module; A fire-resistant panel is disposed between the battery cells and extends toward a lower surface of the module cover plate to delay heat transfer between the battery cells.

19. The vehicle battery pack according to claim 18, characterized in that: The fire-resistant panel forms a plane perpendicular to the module discharge port of the module cover plate and is disposed between the battery cells.

20. The vehicle battery pack according to claim 18, characterized in that: A communication groove partially spaced apart from a lower surface of the module cover plate is formed at an upper portion of the fire-resistant panel.

Images