Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a box body, the battery module is arranged in the box body; the battery module comprises a plurality of battery cells arranged in an array, and at least one side of each battery cell is provided with an anti-explosion valve; the pressure relief assembly comprises a first pressure relief piece and a second pressure relief piece, the first pressure relief piece is arranged on one side of the battery module in the first direction, and the second pressure relief piece is adjacent to the first pressure relief piece and is arranged on one side of the battery module in the second direction; wherein the first pressure relief piece is provided with a first pressure relief channel, the second pressure relief piece is provided with a second pressure relief channel, the first pressure relief channel and the second pressure relief channel are communicated in a sealed mode, and the anti-explosion valve is oppositely communicated with the first pressure relief channel. The pressure relief substance of the explosion-proof valve is sprayed into the first pressure relief channel and flows along the second pressure relief channel, so that pressure relief guide is performed on the pressure relief substance, the pressure relief substance is prevented from directly entering the box body, the influence of the pressure relief substance on an electric device is reduced, and the safety performance of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery pack. Background Art

[0002] With the rapid development of new energy, the requirements for the safety performance of battery packs are getting higher and higher. The battery pack includes multiple single cells, each of which is equipped with an explosion-proof valve. The explosion-proof valve corresponding to the single cell will open the valve to release pressure so as to directly discharge the airflow in the single cell (including electrolyte and harmful gases generated by the electrolysis reaction). However, the pressure relief method of the single cell is usually natural pressure relief, such as directly spraying from the explosion-proof valve into the box. The unfeatured drainage method increases the risk of short circuit of electrical components in the box. Utility Model Content

[0003] In view of this, the present application provides a battery pack, which includes a first pressure relief member and a second pressure relief member that are interconnected to perform guided pressure relief to prevent the material sprayed from the explosion-proof valve from being directly sprayed into the box body, thereby reducing the risk of short circuit of electrical components in the box body.

[0004] To solve the above problems, the technical solutions provided by this application are as follows:

[0005] In a first aspect, the present application provides a battery pack, comprising:

[0006] Box;

[0007] A battery module is disposed in the box; the battery module includes a plurality of battery cells arranged in an array, and at least one side of each of the battery cells is provided with an explosion-proof valve; and

[0008] A pressure relief assembly comprises a first pressure relief member and a second pressure relief member, wherein the first pressure relief member is arranged on one side of the battery module along a first direction, and the second pressure relief member is adjacent to the first pressure relief member and is arranged on one side of the battery module along a second direction; wherein the first pressure relief member has a first pressure relief channel, the second pressure relief member has a second pressure relief channel, the first pressure relief channel and the second pressure relief channel are sealed and connected, and the explosion-proof valve is relatively connected to the first pressure relief channel.

[0009] In an optional embodiment of the present application, the explosion-proof valve is provided on two opposite sides of each of the battery cells, and the first pressure relief member is provided on two sides of the battery module along the first direction.

[0010] In an optional embodiment of the present application, there are multiple battery modules, the multiple battery modules are arranged at intervals, and a first pressure relief member is provided between two adjacent battery modules along the first direction.

[0011] In an optional embodiment of the present application, the first pressure relief member has two first pressure relief channels along the first direction, and the two first pressure relief channels are respectively connected to the explosion-proof valves of two adjacent battery modules.

[0012] In an optional embodiment of the present application, the first pressure relief member is recessed toward a side away from the explosion-proof valve to form the first pressure relief channel.

[0013] In an optional embodiment of the present application, the first pressure relief member includes an integrally formed first sub-plate, a second sub-plate and a third sub-plate, the opposite sides of the second sub-plate are respectively connected to the first sub-plate and the third sub-plate, the first sub-plate and the third sub-plate extend along the first direction and are respectively connected to the battery module, wherein there is a gap between the second sub-plate and the explosion-proof valve.

[0014] In an optional embodiment of the present application, the second pressure relief member includes an integrally formed first sub-connecting plate, a second sub-connecting plate and a third sub-connecting plate, the second sub-connecting plate is respectively connected to the first sub-connecting plate and the third sub-connecting plate and is enclosed with the first sub-connecting plate and the third sub-connecting plate to form a channel, a portion of the third sub-connecting plate protrudes toward a side close to the first sub-connecting plate and supports the connection with the first sub-connecting plate, the third sub-connecting plate extends along the second direction and divides the channel into a plurality of pressure relief channels, the plurality of pressure relief channels include the second pressure relief channel; wherein,

[0015] The first sub-connecting plate is spaced apart from the battery module and a plurality of through holes are provided on the first sub-connecting plate. The first pressure relief channel is connected to the second pressure relief channel through the plurality of through holes.

[0016] In an optional embodiment of the present application, a plurality of pressure relief ports are provided on the third sub-connecting plate, and the pressure relief ports are connected to the second pressure relief channel.

[0017] In an optional embodiment of the present application, the second pressure relief member is further provided with a reinforcing member, which is provided on the third sub-connecting plate and covers a groove formed by the third sub-connecting plate protruding toward the first sub-connecting plate along the first direction.

[0018] In an optional embodiment of the present application, the box body includes an upper cover and a lower cover, the lower cover is configured to support the battery module and the pressure relief assembly, and the upper cover cooperates with the lower cover to seal the battery module.

[0019] In an optional embodiment of the present application, the battery pack further includes:

[0020] The buffer portion is disposed between the first pressure relief member and the box body, the buffer portion covers the first pressure relief member and extends to a side of the battery module close to the lower cover, and the buffer portion covers a portion of the battery module.

[0021] In an optional embodiment of the present application, the battery pack further includes:

[0022] The potting glue is arranged between the battery module and the lower cover.

[0023] In an optional embodiment of the present application, the battery pack further includes:

[0024] An integrated busbar is disposed on opposite sides of the battery module along the first direction and connected to the battery module. The integrated busbar and the first pressure relief member are located on the same side of the battery module.

[0025] In an optional embodiment of the present application, there are multiple battery modules, the multiple battery modules are arranged at intervals, and a first support beam is provided between adjacent battery modules;

[0026] The first support beam includes an integrally formed first support member, a second support member and a third support member, the second support member is respectively connected to the first support member and the third support member on opposite sides close to the lower cover, and the first support member and the third support member respectively extend between the lower cover and the battery module.

[0027] In an optional embodiment of the present application, part of the first support member and the third support member both protrude toward a side close to the battery module, and the first support member and the third support member are configured to support part of the battery module.

[0028] In an optional embodiment of the present application, the battery pack further includes:

[0029] The second support beam is located between the battery module and the lower cover and is spaced apart from the first support member or the third support member. Some of the second support members protrude toward the side close to the battery module, and the second support beam is configured to support part of the battery module.

[0030] The battery pack provided by the present application includes at least the following beneficial effects: the battery pack includes a box; a battery module, which is arranged in the box; the battery module includes a plurality of cells arranged in an array, and at least one side of each cell is provided with an explosion-proof valve; and a pressure relief assembly, including a first pressure relief member and a second pressure relief member, the first pressure relief member is arranged on one side of the battery module along a first direction, and the second pressure relief member is arranged adjacent to the first pressure relief member and is arranged on one side of the battery module along a second direction; wherein the first pressure relief member has a first pressure relief channel, the second pressure relief member has a second pressure relief channel, the first pressure relief channel and the second pressure relief channel are sealed and connected, and the explosion-proof valve is relatively connected to the first pressure relief channel. The substance released by the explosion-proof valve is sprayed into the first pressure relief channel and flows along the second pressure relief channel, so as to prevent the pressure relief substance from directly entering the box, guide the pressure relief of the pressure relief substance, reduce the influence of the pressure relief substance on the electrical device, and improve the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1A , 1B A schematic diagram of an exploded structure of a battery pack provided in one embodiment of the present application.

[0033] Figure 2A , 2B A schematic structural diagram of a first pressure relief member provided in one embodiment of the present application.

[0034] Figure 3A , 3B 3C is a schematic diagram of the structure of the second pressure relief component provided in one embodiment of the present application.

[0035] Figure 4 A schematic diagram of the assembly of a pressure relief assembly provided in one embodiment of the present application.

[0036] Figure 5A , 5B A top view and an AA cross-sectional view of a battery pack provided in one embodiment of the present application.

[0037] Figure 6 for Figure 5B A partial schematic diagram of the part marked with number B.

[0038] Figure 7 A schematic structural diagram of a second support beam provided in one embodiment of the present application.

[0039] Figure 8 for Figure 5B A partial schematic diagram of the part marked with number C.

[0040] Reference numerals: 100-battery pack; 10-box; 101-upper cover; 102-lower cover; 20-battery module; 30-pressure relief assembly; 301-first pressure relief member; 3011-first pressure relief channel; 3012-first sub-plate; 3013-second sub-plate; 30131-bending portion; 30132-connecting portion; 3014-third sub-plate; 302-second pressure relief member; 3021-second pressure relief channel; 3022-first sub-plate Connecting plate; 30221-through hole; 3023-second sub-connecting plate; 3024-third sub-connecting plate; 30241-pressure relief port; 3025-reinforcement member; 40-buffer; 50-potting glue; 60-integrated busbar; 70-first support beam; 701-first support member; 702-second support member; 7021-first part; 7022-second part; 7023-third part; 703-third support member; 80-second support beam. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0042] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0043] The present application may repeat reference numerals and / or reference letters in different embodiments. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0044] The battery pack provided in this application will be described in detail below in conjunction with specific embodiments and drawings.

[0045] See also Figure 1A-Figure 4 The present application provides a battery pack 100, including:

[0046] Box 10;

[0047] A battery module 20 is disposed in the box 10; the battery module 20 includes a plurality of cells arranged in an array, and at least one side of each cell is provided with an explosion-proof valve; and

[0048] The pressure relief assembly 30 includes a first pressure relief member 301 and a second pressure relief member 302, wherein the first pressure relief member 301 is arranged on one side of the battery module 20 along a first direction X, and the second pressure relief member 302 is arranged adjacent to the first pressure relief member 301 and is arranged on one side of the battery module 20 along a second direction Y; wherein the first pressure relief member 301 has a first pressure relief channel 3011, and the second pressure relief member 302 has a second pressure relief channel 3021, the first pressure relief channel 3011 and the second pressure relief channel 3021 are sealed and connected, and the explosion-proof valve is relatively connected to the first pressure relief channel 3011, wherein the first direction X and the second direction Y are, for example, perpendicular to each other.

[0049] Specifically, the box body 10 has a housing cavity, and the battery module 20 and the pressure relief assembly 30 are both located in the housing cavity. The first pressure relief member 301 and the second pressure relief member 302 have cavities inside, for example. In order to reduce the probability of thermal runaway of the battery cell, the explosion-proof valve may release pressure continuously or intermittently, and the cavity is, for example, the first pressure relief channel 3011 and the second pressure relief channel 3021, which are configured to guide the pressure relief. The gas or particles generated during the pressure relief will not be directly sprayed into the battery pack, but enter the first pressure relief member 301, thereby reducing the impact of the gas or particles generated during the pressure relief entering the battery pack on the short circuit of the electrical device.

[0050] Specifically, the battery cell is, for example, a square battery cell, which has a composition similar to that of a cylindrical ternary battery, and the power of the battery pack 100 can be increased to 90 degrees of power.

[0051] In an optional embodiment of the present application, the explosion-proof valves are provided on two opposite sides of each of the battery cells, and the first pressure relief members 301 are provided on two sides of the battery module 20 along the first direction X.

[0052] In one embodiment, the number of the first pressure relief members 301 is two, and the two first pressure relief members 301 are respectively arranged on opposite sides of the battery module 20 along the first direction X, and one end of the two first pressure relief members 301 close to the second pressure relief member 302 is connected to the second pressure relief member 302, and the pressure relief material of the explosion-proof valve enters the first pressure relief member 301, and then enters the second pressure relief channel 3021 from the first pressure relief channel 3011.

[0053] Furthermore, the number of the battery modules 20 is also multiple, and the multiple battery modules 20 are arranged at intervals, for example, and the opposite sides of each battery module 20 are provided with the first pressure relief member 301 opposite to the explosion-proof valve, and are configured to guide the pressure relief of the pressure relief material discharged by the explosion-proof valve, wherein the length of the second pressure relief member 302 extending along the second direction Y is equal to the cross-sectional length of the multiple battery modules 20 arranged at intervals along the second direction Y.

[0054] In another embodiment, there are multiple battery modules 20 , and the multiple battery modules 20 are arranged at intervals along the second direction Y. A first pressure relief member is provided between two adjacent battery modules 20 along the first direction X.

[0055] In this embodiment, the first pressure relief member has two first pressure relief channels along the first direction X, and the two first pressure relief channels are respectively connected to the explosion-proof valves of two adjacent battery modules.

[0056] It can be understood that a first pressure relief member (not shown) is shared between two adjacent battery modules 20. The first pressure relief member has two first pressure relief channels, the two first pressure relief channels extend along the first direction X, and the first pressure relief member is recessed toward the side away from the explosion-proof valve on both sides of the explosion-proof valve, thereby forming two first pressure relief channels and guiding the pressure relief of the substances generated by the explosion-proof valve. The specific application of the first pressure relief member shall be subject to actual application and is not limited in this application.

[0057] See also Figure 2A and Figure 2B In an optional embodiment of the present application, the first pressure relief member 301 is recessed toward a side away from the explosion-proof valve to form the first pressure relief channel 3011 .

[0058] In an optional embodiment of the present application, the first pressure relief member 301 includes an integrally formed first sub-plate 3012, a second sub-plate 3013 and a third sub-plate 3014, the opposite sides of the second sub-plate 3013 are respectively connected to the first sub-plate 3012 and the third sub-plate 3014, the first sub-plate 3012 and the third sub-plate 3014 extend along the first direction X and are respectively connected to the battery module 20, wherein there is a gap between the second sub-plate 3013 and the explosion-proof valve.

[0059] Specifically, the cross-section of the first pressure relief member 301 along the first direction X is, for example, in the shape of a "X", wherein the first sub-plate 3012 and the third sub-plate 3014 are both fitted and connected to one side of the battery module 20, and the first sub-plate 3012 and the third sub-plate 3014 are respectively vertically connected to the opposite sides of the second sub-plate 3013, thereby enclosing and forming the first pressure relief channel 3011.

[0060] Furthermore, the second sub-board 3013 includes two relatively arranged bending portions 30131 and connecting portions 30132 respectively connected vertically to the bending portions, one of the two bending portions 30131 is vertically connected to the first sub-board 3012, and the other is vertically connected to the third sub-board 3014, and there is a certain distance between the connecting portion 30132 and the battery cell, so that the first sub-board 3012, the second sub-board 3013 and the third sub-board 3014 can form a first pressure relief channel 3011 for the flow of pressure relief materials, and the explosion-proof valve, for example, faces the first pressure relief channel 3011 and relieves pressure into the first pressure relief channel 3011.

[0061] It can be understood that the first pressure relief member 301 is, for example, a structure with an opening on one side and a cross section along the first direction X that is in the shape of an “X”. The open side of the first pressure relief member 301 is connected to the battery module 20 to form the first pressure relief channel 3011 .

[0062] Furthermore, the first pressure relief member 301 can be made of glass fiber, epoxy resin or a combination thereof, but is not limited thereto. The first sub-plate 3012 and the third sub-plate 3014 of the first pressure relief member 301 can be adhered to at least one side or two opposite sides of the battery module 20 using structural adhesive.

[0063] See also Figure 3A , Figure 3B as well as Figure 3CIn an optional embodiment of the present application, the second pressure relief member 302 includes an integrally formed first sub-connecting plate 3022, a second sub-connecting plate 3023 and a third sub-connecting plate 3024, the second sub-connecting plate 3023 respectively connects the first sub-connecting plate 3022 and the third sub-connecting plate 3024 and is enclosed with the first sub-connecting plate 3022 and the third sub-connecting plate 3024 to form a channel, a portion of the third sub-connecting plate 3024 protrudes toward a side close to the first sub-connecting plate 3022 and supports the connection with the first sub-connecting plate 3022, the third sub-connecting plate 3024 extends along the second direction Y and divides the channel into a plurality of pressure relief channels, the plurality of pressure relief channels include the second pressure relief channel 3021.

[0064] Specifically, the second pressure relief channel 3021 of the second pressure relief member 302 is located on a side close to the lower cover 102, and an escape space is provided on a side close to the upper cover of the second pressure relief member 302. The escape space can be located in the middle of the second pressure relief member 302 for avoiding electrical parts of the battery module 20. The second pressure relief channel 3021 formed by the third sub-connecting plate 3024 extending along the second direction Y is open at both ends, and the two ends of the second pressure relief member 302 are welded to the inner wall of the lower cover 102 to seal the second pressure relief member 302, thereby reducing the possibility of pressure relief substances leaking into the battery pack 100.

[0065] Furthermore, the first sub-connecting plate 3022 is spaced apart from the battery module 20 and a plurality of through holes 30221 are provided on the first sub-connecting plate 3022 , and the first pressure relief channel 3011 is connected with the second pressure relief channel 3021 through the plurality of through holes 30221 .

[0066] Specifically, a plurality of through holes 30221 are, for example, arranged on the first sub-connecting plate 3022 and are provided corresponding to the first pressure relief member 301. The orthographic projection of the first pressure relief member 301 on the first sub-connecting plate 3022 completely covers the plurality of through holes 30221, so that the first pressure relief member 301 is connected with the second pressure relief channel 3021 through the plurality of through holes 30221, thereby realizing the drainage and guiding of the pressure relief material.

[0067] Specifically, the battery module 20 may be provided with end plates on opposite sides along the first direction X, for example, and the end plates are fitted with the battery module 20, and a clamping tool is reserved. After the modules are stacked, the tool applies a clamping force and is placed in the battery pack, which can effectively improve the life of the battery pack. In one embodiment, the end plates may be made of a mixed material of polybutylene terephthalate (PBT) and a glass fiber reinforced polyamide material containing 30% glass fiber, for example, but are not limited thereto.

[0068] Furthermore, an expansion plate is provided between the battery modules 20 to divide the battery module 20 into multiple modules, and is fixedly connected to the battery cell by means of adhesive, so that the battery module 20 is divided into multiple modules to bear force, thereby playing a role in resisting module expansion and improving the life of the battery pack 100.

[0069] In an optional embodiment of the present application, a plurality of pressure relief ports 30241 are provided on the third sub-connecting plate 3024 , and the pressure relief ports 30241 are connected to the second pressure relief channel 3021 .

[0070] Specifically, the first pressure relief member 301 and the second pressure relief member 302 guide the pressure relief material of the explosion-proof valve to the pressure relief port 30241 on the second pressure relief member 302 for discharge, thereby meeting the safety performance of the battery pack 100. In one embodiment, the battery pack 100 is provided with an external explosion-proof valve and a pressure relief valve, which can prevent explosion and relieve pressure for the entire battery pack 100.

[0071] Furthermore, both ends of the second pressure relief member 302 are welded to the box body 10, and sealant can be applied to the welding points to ensure that the second pressure relief channel 3021 of the second pressure relief member 302 is relatively sealed, thereby reducing the probability of pressure relief material leaking into the battery pack and reducing the risk of short circuit of electrical devices.

[0072] In an optional embodiment of the present application, the second pressure relief member 302 is further provided with a reinforcement member 3025, which is provided on the third sub-connecting plate 3024 and covers the groove formed after the third sub-connecting plate 3024 protrudes toward the first sub-connecting plate 3022 along the first direction X, thereby improving the resistance of the second pressure relief member 302. The second pressure relief member 302 further improves the strength of the battery pack 100.

[0073] See also Figure 1A and Figure 1B In an optional embodiment of the present application, the box body 10 includes an upper cover 101 and a lower cover 102, the lower cover 102 is configured to support the battery module 20 and the pressure relief assembly 30, and the upper cover 101 cooperates with the lower cover 102 to seal the battery module 20.

[0074] Specifically, in the related art, in order to ensure the sealing width and the strength of the battery pack, the outer body is designed to have a certain thickness, generally 15mm-20mm. In the embodiment of the present application, in order to improve the energy density of the battery pack, the external structure of the box 10 is, for example, stamped. The thickness of the aluminum profile of at least 15mm in the related art is reduced to 1.2mm stamped steel (22MnB5 hot-formed steel), which can effectively reduce the thickness of the box 10. The wall thickness of the stamped box can be, for example, 1.2mm. The space required by each module in the entire box 10 can be optimized, and the weight of the battery pack can be reduced while achieving the performance of the battery pack.

[0075] See also Figure 5A and Figure 5B In an optional embodiment of the present application, the battery pack 100 further includes:

[0076] The buffer portion 40 is disposed between the first pressure relief member 301 and the box body 10 . The buffer portion 40 covers the first pressure relief member 301 and extends to a side of the battery module 20 close to the lower cover 102 . The buffer portion 40 covers a portion of the battery module 20 .

[0077] Specifically, the buffer portion 40 is, for example, foam glue, but is not limited thereto. The buffer portion 40 is used to connect the battery module 20 to the enclosure 10. It can be understood that the buffer portion 40 is filled in the enclosure 10, and is partially located between the first pressure relief member 301 and the side wall of the lower cover 102, filling the gap between the first pressure relief member 301 and the side wall of the lower cover 102, and has the functions of shock absorption, buffering, and improving the safety of the battery pack 100. In addition, part of the buffer portion 40 also extends between the battery module 20 and the bottom wall of the lower cover 102, wrapping the corners of the battery module 20, protecting the battery module 20, and having a certain shock absorption effect on the battery module 20, further improving the strength and safety of the battery module 20.

[0078] See also Figure 5B In an optional embodiment of the present application, the battery pack 100 further includes:

[0079] The potting glue 50 is disposed between the battery module 20 and the lower cover 102 .

[0080] Specifically, the potting glue 50, for example, covers the bottom of multiple battery modules 20, that is, between the battery module 20 and the lower cover 102. The potting glue 50 can connect the battery module 20 with the box body 10 to prevent the bottom of the battery pack from being hit and causing thermal runaway, thereby further improving the strength of the box body 10.

[0081] In an optional embodiment of the present application, the battery pack 100 further includes:

[0082] The integrated busbar 60 is disposed on opposite sides of the battery module 20 along the first direction X and connected to the battery module 20 . The integrated busbar 60 and the first pressure relief member 301 are located on the same side of the battery module 20 .

[0083] Specifically, the integrated busbar 60 and the first pressure relief member 301 are located on the same side of the battery module 20. The integrated busbar 60, for example, includes a plurality of flexible printed circuit boards (FPCs), a bus and a plastic bracket, wherein the plastic bracket is arranged on the battery module 20 along the first direction X, the bus is arranged on the plastic bracket, and the plurality of flexible circuit boards are respectively a first circuit board and a second circuit board. The first circuit board extends along the first direction X and is connected to the bus for collecting the temperature or voltage signal of the battery module 20. The second circuit board is connected to the battery module 20 and is located between the upper cover 101 and the battery module 20 for transmitting signals to sensors on the battery module 20. The position of the integrated busbar 60 improves space utilization and avoids the influence of the buffer portion 40 on the integrated busbar 60, thereby improving the safety of the battery pack 100.

[0084] See also Figure 5A-Figure 7 In an optional embodiment of the present application, the number of the battery modules 20 is multiple, the multiple battery modules 20 are arranged at intervals, and a first support beam 70 is provided between adjacent battery modules 20;

[0085] The first support beam 70 includes an integrally formed first support member 701, a second support member 702 and a third support member 703. The second support member 702 is respectively connected to the first support member 701 and the third support member 703 on opposite sides close to the lower cover 102. The first support member 701 and the third support member 703 respectively extend between the lower cover 102 and the battery module 20 to improve the strength of the battery pack 100.

[0086] Specifically, the second support member 702 includes an integrally formed first portion 7021, a second portion 7022 and a third portion 7023, the two ends of the second portion 7022 are respectively vertically connected to the first portion 7021 and the third portion 7023, and the first portion 7021 and the third portion 7023 extend toward a side close to the lower cover 102. The second portion 7022 is provided with a connection hole, which is configured to be fixed to a liquid cooling plate, and the first portion 7021 and the third portion 7023 can be configured to provide a fixed connection position for other electrical components. The first portion 7021 is connected to the third support member 703 on a side away from the second portion 7022, and the third support member 703 extends along the second direction Y and has a cross-section of, for example, a "X" shape, for supporting one side of the battery module 20. The third portion 7023 is connected to the first support member 701 at a side away from the second portion 7022 . The first support member 701 extends along the second direction Y and has a cross-section of, for example, an X-shape, for supporting one side of the battery module 20 .

[0087] Furthermore, the first support member 701 and the third support member 703 are coated with polycarbonate (PC) on one side close to the battery module 20 .

[0088] In an optional embodiment of the present application, part of the first support member 701 and the third support member 703 both protrude toward a side close to the battery module 20, and the first support member 701 and the third support member 703 are configured to support part of the battery module 20, the protruding part is used to support the battery module 20, and the other part is used to fit and support the lower cover 102.

[0089] See also Figure 8 In an optional embodiment of the present application, the battery pack 100 further includes:

[0090] The second support beam 80 is located between the battery module 20 and the lower cover 102 and is spaced apart from the first support member 701 or the third support member 703 . Part of the second support members 702 protrude toward the side close to the battery module 20 . The second support beam 80 is configured to support part of the battery module 20 .

[0091] Specifically, the first support beam 70 and the second support beam 80 are located together between the battery module 20 and the lower cover 102, and are configured to support the battery module 20. The first support beam 70 and the second support beam 80 are spaced apart to ensure that the battery module 20 remains horizontal and does not tilt, provide space for the potting glue 50 to be coated, and provide shockproof space for the battery module 20 to a certain extent to prevent the bottom of the battery pack from being hit and causing thermal runaway.

[0092] Specifically, the first support member 701 and the third support member 703 of the first support beam 70 both protrude toward the side close to the battery module 20, and the second support beam 80 also protrudes toward the side of the battery module 20. The height of the three protrusions is, for example, equal to the thickness of the potting glue 50 applied.

[0093] In a second aspect, an automobile vehicle comprises:

[0094] The battery pack 100 described above.

[0095] Specifically, the box body 10 of the battery pack 100 has a high energy density and a light weight, thereby improving the endurance of the vehicle.

[0096] The battery pack provided by the present application includes at least the following working process or principle: the first pressure relief channel 3011 and the second pressure relief channel 3021 of the first pressure relief member 301 and the second pressure relief member 302 are connected respectively, the first pressure relief member 301 is opposite to the explosion-proof valve, the pressure relief material of the explosion-proof valve enters the first pressure relief channel 3011, enters the second pressure relief channel 3021 from the first pressure relief channel 3011, and finally leaks out from the pressure relief port 30241, so as to prevent the pressure relief material from directly entering the battery pack, realize the pressure relief guiding function, and reduce the short circuit risk of the electrical device. The buffer portion 40 is located between the first pressure relief member 301 and the inner wall of the box body 10, and extends between the lower cover 102 and the battery module 20, enveloping the battery module 20 and the box body 10 to form a connection, thereby improving the strength of the box body. A potting glue 50 is provided between the battery module 20 and the lower cover 102 to improve the strength between the battery cell and the box envelope, prevent the bottom of the battery pack 100 from being hit and causing thermal runaway, and improve the safety performance of the battery.

[0097] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A battery pack, characterized in that: include: Box; A battery module is disposed in the box; the battery module includes a plurality of battery cells arranged in an array, and at least one side of each of the battery cells is provided with an explosion-proof valve; and A pressure relief assembly comprises a first pressure relief member and a second pressure relief member, wherein the first pressure relief member is arranged on one side of the battery module along a first direction, and the second pressure relief member is adjacent to the first pressure relief member and is arranged on one side of the battery module along a second direction; wherein the first pressure relief member has a first pressure relief channel, the second pressure relief member has a second pressure relief channel, the first pressure relief channel and the second pressure relief channel are sealed and connected, and the explosion-proof valve is relatively connected to the first pressure relief channel.

2. The battery pack according to claim 1, characterized in that: The explosion-proof valves are provided on opposite sides of each of the battery cells, and the first pressure relief parts are provided on both sides of the battery module along the first direction.

3. The battery pack according to claim 1, wherein: There are multiple battery modules, and the multiple battery modules are arranged at intervals. A first pressure relief member is provided between two adjacent battery modules along the first direction.

4. The battery pack according to claim 3, characterized in that: The first pressure relief member has two first pressure relief channels along the first direction, and the two first pressure relief channels are respectively connected to the explosion-proof valves of two adjacent battery modules.

5. The battery pack according to any one of claims 1 to 2, characterized in that: The first pressure relief member is recessed toward a side away from the explosion-proof valve to form the first pressure relief channel.

6. The battery pack according to claim 5, characterized in that: The first pressure relief member includes an integrally formed first sub-plate, a second sub-plate and a third sub-plate, the opposite sides of the second sub-plate are respectively connected to the first sub-plate and the third sub-plate, the first sub-plate and the third sub-plate extend along the first direction and are respectively connected to the battery module, wherein there is a gap between the second sub-plate and the explosion-proof valve.

7. The battery pack according to claim 6, characterized in that: The second pressure relief member includes an integrally formed first sub-connecting plate, a second sub-connecting plate and a third sub-connecting plate, the second sub-connecting plate is respectively connected to the first sub-connecting plate and the third sub-connecting plate and is enclosed with the first sub-connecting plate and the third sub-connecting plate to form a channel, a portion of the third sub-connecting plate protrudes toward a side close to the first sub-connecting plate and supports and connects to the first sub-connecting plate, the third sub-connecting plate extends along the second direction and divides the channel into a plurality of pressure relief channels, the plurality of pressure relief channels include the second pressure relief channel; wherein, The first sub-connecting plate is spaced apart from the battery module and a plurality of through holes are provided on the first sub-connecting plate. The first pressure relief channel is connected to the second pressure relief channel through the plurality of through holes.

8. The battery pack according to claim 7, characterized in that: The third sub-connecting plate is provided with a plurality of pressure relief ports, and the pressure relief ports are connected to the second pressure relief channel.

9. The battery pack according to claim 7, characterized in that: The second pressure relief member is further provided with a reinforcing member, which is disposed on the third sub-connecting plate and covers a groove formed by the third sub-connecting plate protruding toward the first sub-connecting plate along the first direction.

10. The battery pack according to any one of claims 1 or 2, characterized in that: The box body includes an upper cover and a lower cover, the lower cover is configured to support the battery module and the pressure relief assembly, and the upper cover cooperates with the lower cover to seal the battery module.

11. The battery pack according to claim 10, characterized in that: The battery pack further comprises: The buffer portion is disposed between the first pressure relief member and the box body, the buffer portion covers the first pressure relief member and extends to a side of the battery module close to the lower cover, and the buffer portion covers a portion of the battery module.

12. The battery pack according to claim 10, characterized in that: The battery pack further comprises: The potting glue is arranged between the battery module and the lower cover.

13. The battery pack according to claim 2, characterized in that: The battery pack further comprises: An integrated busbar is disposed on opposite sides of the battery module along the first direction and connected to the battery module. The integrated busbar and the first pressure relief member are located on the same side of the battery module.

14. The battery pack according to claim 10, characterized in that: There are multiple battery modules, the multiple battery modules are arranged at intervals, and a first support beam is provided between adjacent battery modules; The first support beam includes an integrally formed first support member, a second support member and a third support member, the second support member is respectively connected to the first support member and the third support member on opposite sides close to the lower cover, and the first support member and the third support member respectively extend between the lower cover and the battery module.

15. The battery pack according to claim 14, characterized in that: Part of the first support member and the third support member both protrude toward a side close to the battery module, and the first support member and the third support member are configured to support part of the battery module.

16. The battery pack according to claim 15, characterized in that: The battery pack further comprises: The second support beam is located between the battery module and the lower cover and is spaced apart from the first support member or the third support member. Some of the second support members protrude toward the side close to the battery module, and the second support beam is configured to support part of the battery module.

Images