Exhaust assembly, battery module and battery pack

Abstract

The application discloses an exhaust assembly, comprising: an exhaust member, a plurality of air guide members, and a plurality of exhaust baffles, the air guide members are arranged in the exhaust cavity of the exhaust member and correspond to the exhaust inlets, the exhaust baffles are arranged at the outlets of the air guide members, when the exhaust baffles are in a first position, the exhaust baffles block the openings of the corresponding air guide members, when the exhaust baffles are in a second position, the exhaust baffles open the openings of the corresponding air guide members, and the exhaust baffles cut off the flow paths of the exhaust cavities. The exhaust assembly aims to solve the problem that high-temperature substances are prone to accumulate in the exhaust assembly when thermal runaway occurs in the battery cell, and the flow of the high-temperature substances and the gas is constrained and guided to a specified direction, so that the high-temperature substances and the gas are quickly discharged and are not prone to accumulation, thereby avoiding further thermal runaway of the adjacent battery cell. The application further discloses a battery module and a battery pack.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to an exhaust assembly, a battery module, and a battery pack. Background Technology

[0002] Battery modules typically consist of multiple cells. When a cell experiences thermal runaway, it generates a large amount of high-temperature gas and substances, which can even cause a fire in severe cases. To ensure safety, a venting assembly is required within the battery module. This assembly can expel the high-temperature gas to the outside environment when a cell experiences thermal runaway, thereby reducing the internal temperature of the battery module and preventing heat spread, thus avoiding thermal runaway in more adjacent cells.

[0003] For example, Chinese patent CN2022103325014 uses an exhaust assembly to discharge high-temperature gas through a unified second channel, and also sets up a one-way valve to isolate the gas, making it less likely for other cells to affect thermal runaway. However, its guiding performance is poor, and high-temperature substances tend to accumulate in the exhaust assembly, especially in the area near the sealing end of the exhaust assembly, so its thermal runaway management is still not perfect. Summary of the Invention

[0004] To overcome at least one of the defects described in the prior art, the present invention provides an exhaust assembly designed to solve the problem of high-temperature substances accumulating in the exhaust assembly when a battery cell experiences thermal runaway. The assembly utilizes a built-in air guide to divert the flow and uses an exhaust baffle to cut off the flow path of the exhaust chamber, thereby constraining and guiding the flow of high-temperature substances and gases in a designated direction. This allows the high-temperature substances and gases to be discharged quickly and prevents them from accumulating, thus avoiding further thermal runaway of adjacent battery cells.

[0005] The technical solution adopted by this invention to solve its problem is:

[0006] An exhaust assembly for use in a battery module comprising multiple battery cells, comprising:

[0007] The exhaust component has an exhaust chamber inside it. The exhaust component is also provided with at least one exhaust outlet hole communicating with the exhaust chamber and multiple exhaust inlets communicating with the exhaust chamber. The multiple exhaust inlets are arranged in sequence along the direction toward the exhaust outlet hole. Each exhaust inlet hole is used to introduce high-temperature substances and gases discharged from the battery cell.

[0008] Multiple air guides are provided in the exhaust chamber. At least some exhaust inlets are provided with air guides. The air guides open in the direction of the exhaust outlet and connect the corresponding exhaust inlets to the exhaust chamber.

[0009] A plurality of exhaust baffles are movably arranged at the openings of the air guide members, and each of the exhaust baffles has a first position and a second position; when the exhaust baffle is in the first position, the exhaust baffle blocks the opening of the corresponding air guide member; the high-temperature substances and gases flowing from the air guide member to the exhaust cavity can drive the corresponding exhaust baffle to switch from the first position to the second position; when the exhaust baffle is in the second position, the exhaust baffle opens the opening of the corresponding air guide member, and the exhaust baffle cuts off the flow path of the exhaust cavity.

[0010] Further, when the exhaust baffle is in the first position, the extension direction of the exhaust baffle is arranged obliquely relative to the arrangement direction of the plurality of exhaust inlets, at this time the exhaust baffle is used to guide the high-temperature substances and gases in the exhaust cavity to flow to the exhaust outlet, and the high-temperature substances and gases in the exhaust cavity push the exhaust baffle to remain in the first position.

[0011] Further, the opening of the air guide member is arranged eccentrically relative to the exhaust inlet, and when the exhaust baffle is in the first position, the corresponding exhaust inlet is isolated from the flow path of the exhaust cavity.

[0012] Further, the air guide member includes a base and a cover plate, the base and the cover plate are connected and surround the exhaust cavity, the exhaust inlet is arranged on the bottom wall of the base, the air guide member is integrally connected with the bottom wall of the base and is arranged around the exhaust inlet, the cover plate is sealed against the air guide member, the first end of the air guide member is connected with one side wall of the base, and the second end of the air guide member has a gap with one side wall of the base to form the opening.

[0013] Further, the plurality of air guide members are arranged in sequence and staggered, and in the two adjacent air guide members, one of the air guide members is connected with one side wall of the base, and the other of the air guide members is connected with the other side wall of the base.

[0014] Further, the first end of the exhaust baffle is pivoted at the second end of the corresponding air guide member, the second end of the exhaust baffle abuts against the side wall of the base to block the opening of the air guide member when the exhaust baffle is in the first position, and the second end of the exhaust baffle abuts against the outside of the adjacent air guide member to cut off the flow path of the exhaust cavity when the exhaust baffle is in the second position.

[0015] Further, the first end of the exhaust baffle is provided with a rotating shaft, the bottom wall of the base is provided with a first shaft hole corresponding to the rotating shaft, the cover plate is provided with a second shaft hole corresponding to the rotating shaft, and the two ends of the rotating shaft are respectively inserted into the first shaft hole and the second shaft hole, and the circumferential outside of the rotating shaft is fitted with the second end of the air guide member.

[0016] Further, the flow path of the exhaust cavity is in a serpentine shape.

[0017] Further, the first end of the air guide member is provided with a first guide surface and a second guide surface at the connection with the side wall of the base, and the first guide surface and the second guide surface are arranged opposite to each other.

[0018] Further, the outer side of the exhaust member is further provided with a plurality of bosses, each of which is correspondingly arranged with an exhaust inlet hole, and each of the bosses is used to abut the outer wall of the periphery of the explosion-proof valve of the battery cell.

[0019] Based on the same concept, the application further discloses a battery module, which comprises a plurality of battery cells and the exhaust assembly as described above, and the explosion-proof valve of each battery cell is correspondingly arranged with an exhaust inlet hole of the exhaust assembly.

[0020] Based on the same concept, the application further discloses a battery pack, which applies the battery module as described above.

[0021] In summary, the exhaust assembly provided by the application has the following technical effects:

[0022] When thermal runaway occurs in a certain battery cell in the middle, the high-temperature substances and gases are guided from the corresponding exhaust inlet hole, the high-temperature substances and gases push the corresponding exhaust baffle to the second position to open the outlet of the air guide member, the air guide member guides the high-temperature substances and gases into the exhaust cavity and flows quickly to the exhaust outlet hole, and the exhaust baffle cuts off the flow path of the exhaust cavity, so that the high-temperature gases can only flow forward (i.e. towards the exhaust outlet hole), thereby not affecting the normal battery cells at the rear end. During the process of flowing forward of the high-temperature substances and gases, the exhaust baffles at the front end are in the first position, which can prevent the high-temperature substances and gases from flowing into the exhaust inlet holes at the front end and affecting the normal battery cells at the front end. In this way, the high-temperature substances and gases can be prevented from flowing to other exhaust inlet holes to protect other battery cells from being affected by the high-temperature substances and gases, and the high-temperature gases can carry the high-temperature substances out quickly and are not easy to accumulate, thereby avoiding further thermal runaway. Other beneficial effects will be shown in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a structural schematic diagram of a battery module according to an embodiment of the application;

[0024] Figure 2 FIG. 3 is an explosion schematic diagram of an exhaust assembly according to an embodiment of the application;

[0025] Figure 3 FIG. 4 is a structural schematic diagram of a battery module according to another embodiment of the application; Figure 2 FIG. 5 is a partial enlarged view of part A shown in FIG. 4;

[0026] Figure 4 FIG. 6 is a working state schematic diagram of an exhaust assembly according to an embodiment of the application;

[0027] Figure 5 FIG. 7 is a working state schematic diagram of an exhaust assembly according to another embodiment of the application;

[0028] Figure 6 FIG. 8 is a partial cross-sectional enlarged view of an exhaust assembly according to an embodiment of the application.

[0029] In the drawings, reference numbers refer to the same or similar elements throughout.

[0030] 100, exhaust assembly; 1, exhaust member; 13, exhaust cavity; 14, exhaust outlet; 15, exhaust inlet; 16, boss; 11, base; 111, bottom wall; 112, first side wall; 113, second side wall; 114, first shaft hole; 12, cover plate; 121, second shaft hole; 2, air guide member; 21, first guide surface; 22, second guide surface; 3, exhaust baffle; 31, rotating shaft; 200, battery cell; 201, explosion-proof valve. DETAILED DESCRIPTION

[0031] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application.

[0032] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application herein is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0034] Referring to Figure 1 and Figure 2 , the present application discloses an exhaust assembly 100 applied to a battery module, the battery module comprising the exhaust assembly 100 and a plurality of battery cells 200, the battery cell 200 being provided with an explosion-proof valve 201, the exhaust assembly 100 collecting and guiding high-temperature substances and gases sprayed out when the battery cell 200 is in thermal runaway, avoiding the intensification of thermal runaway, and aiming to solve the problem of easy accumulation of high-temperature substances in the exhaust assembly 100 when the battery cell 200 is in thermal runaway. The present application also discloses a battery pack applied with the battery module.

[0035] In the embodiment, the exhaust assembly 100 comprises an exhaust member 1, a plurality of air guide members 2, and a plurality of exhaust baffles 3. The exhaust member 1 is provided with an exhaust cavity 13. The exhaust member 1 is further provided with at least one exhaust outlet hole 14 and a plurality of exhaust inlet holes 15, which are in communication with the exhaust cavity 13. The plurality of exhaust inlet holes 15 are arranged in sequence in a direction towards the exhaust outlet hole 14. The explosion-proof valve 201 of each battery cell 200 corresponds to a position of one exhaust inlet hole 15. Each exhaust inlet hole 15 is used to guide the high-temperature substances and gases discharged by the battery cell 200. The air guide member 2 is arranged in the exhaust cavity 13. At least part of the exhaust inlet hole 15 is provided with the air guide member 2. The air guide member 2 is open in a direction towards the exhaust outlet hole 14. The air guide member 2 connects the corresponding exhaust inlet hole 15 and the exhaust cavity 13. The openings of the plurality of air guide members 2 are in the same direction and are all towards the exhaust outlet hole 14, so that the high-temperature substances and gases in the exhaust cavity 13 flow in the same direction, avoiding backflow and improving the flow smoothness and safety. The exhaust baffle 3 is movably arranged at the opening of the air guide member 2. The exhaust baffle 3 has a first position and a second position. When the exhaust baffle 3 is in the first position, the exhaust baffle 3 blocks the opening of the corresponding air guide member 2, thereby playing a protective role. The high-temperature substances and gases flowing from the air guide member 2 to the exhaust cavity 13 can drive the corresponding exhaust baffle 3 to switch from the first position to the second position. When the exhaust baffle 3 is in the second position, the exhaust baffle 3 opens the opening of the corresponding air guide member 2, and the exhaust baffle 3 cuts off the flow path of the exhaust cavity 13, so that the high-temperature substances and gases can only flow towards the exhaust outlet hole 14 and cannot flow towards the closed end.

[0036] The outer side of the exhaust member 1 is further provided with a plurality of bosses 16. Each boss 16 corresponds to one exhaust inlet hole 15. Each boss 16 is used to be attached to the outer wall of the explosion-proof valve 201 of the battery cell 200, so as to better guide the high-temperature substances and gases discharged by the battery cell 200 and reduce the risk of leakage. Of course, the communication mode between the exhaust assembly 100 and the explosion-proof valve 201 of the battery cell 200 can also adopt other modes such as indirect communication, which is not limited herein.

[0037] As a specific example, refer to Figure 2 , in combination with Figure 4 and Figure 5, the exhaust piece 1 is substantially long strip shape, one end of the length direction is closed, and the other end of the length direction is provided with an exhaust outlet hole 14, thirteen exhaust inlet holes 15 are arranged in sequence along the length direction of the exhaust piece 1, the guide piece 2 and the exhaust baffle 3 are each provided with twelve, and the exhaust inlet hole 15 closest to the closed end can not be provided with the guide piece 2 and the exhaust baffle 3. It should be noted that the number of the guide piece 2 and the exhaust baffle 3 can be less than the exhaust inlet hole 15, or the number can be the same, which is not limited here; and the number of the guide piece 2, the exhaust baffle 3 and the exhaust inlet hole 15 can also be selected differently according to the needs. The exhaust inlet hole 15 and the exhaust outlet hole 14 can be any one of circular shape, oval shape, rectangular shape, diamond shape and the like, and the specific shape of the exhaust inlet hole 15 is not limited, and the specific shape of the exhaust outlet hole 14 is also not limited.

[0038] Referring to Figure 4 or Figure 5 and Figure 4 or Figure 5 direction reference, the sealed end is located on the left side (defined as the rear end), the exhaust outlet hole 14 is located on the right side (defined as the front end), the plurality of exhaust inlet holes 15 are sequentially defined as No. 1 exhaust inlet hole, No. 2 exhaust inlet hole,..., N exhaust inlet hole from left to right, the plurality of guide pieces 2 are sequentially defined as No. 1 guide piece, No. 2 guide piece,..., M guide piece from left to right, and the plurality of exhaust baffles 3 are sequentially defined as No. 1 exhaust baffle, No. 2 exhaust baffle,..., M exhaust baffle from left to right. In the use process, for example, as shown in Figure 4 shown when the No. 2 exhaust inlet hole corresponds to the thermal runaway of the battery cell 200, the high-temperature substances and gases are guided from the No. 2 exhaust inlet hole, the high-temperature substances and gases push the No. 1 exhaust baffle to the second position to open the outlet of the No. 1 guide piece, and the No. 1 exhaust baffle also cuts off the flow path of the exhaust cavity 13, the No. 1 guide piece guides the high-temperature substances and gases into the exhaust cavity 13 and flows quickly to the exhaust outlet hole 14 (i.e. flows to the front end), because the No. 1 exhaust baffle cuts off the flow path of the exhaust cavity 13 and blocks the channel to the sealed end, the high-temperature substances and gases cannot flow to the No. 1 exhaust inlet hole and accumulate (i.e. cannot flow to the rear end), so as not to affect the normal battery cell 200 close to the sealed end of the exhaust piece 1; in the process of the high-temperature substances and gases flowing to the front end, the No. 2 exhaust baffle to the M exhaust baffle on the right side of the No. 2 exhaust inlet hole are in the first position, which can prevent the high-temperature substances and gases from flowing into the No. 3 exhaust inlet hole to the No. N exhaust inlet hole and affecting the normal battery cell 200 close to the exhaust outlet hole 14. In the use process, for example, as shown in Figure 5When the battery cell 200 corresponding to the first exhaust inlet hole 15a is in thermal runaway, the high-temperature substances and gases are guided from the first exhaust inlet hole 15a. Since the first exhaust inlet hole 15a is closest to the sealed end, the high-temperature substances and gases can quickly flow to the exhaust outlet hole 14 (i.e., flow to the front end). During the flow of the high-temperature substances and gases to the front end, all the exhaust baffles 3 located to the right of the first exhaust inlet hole 15a are in the first position, which can prevent the high-temperature substances and gases from flowing into the second exhaust inlet hole 15b to the Nth exhaust inlet hole 15n and affecting other normal battery cells 200.

[0039] In this way, the exhaust assembly 100 provided by the application uses the built-in air guide member 2 to guide the flow, and uses the exhaust baffle 3 to cut off the flow path of the exhaust cavity 13, so as to constrain and guide the flow of the high-temperature substances and gases in a specified direction. This can avoid the flow of the high-temperature substances and gases to other exhaust inlet holes 15 to protect other battery cells 200 from being affected by the high-temperature substances and gases, and can avoid the accumulation of the high-temperature substances and gases when the high-temperature gases are quickly discharged outward, so as to avoid further thermal runaway.

[0040] It can be understood that, in other preferable examples, the air guide member 1 can also be provided with two exhaust outlet holes 14, which are respectively arranged at the two ends of the air guide member 1. The air guide members 2 at some of the exhaust inlet holes 15 are opened towards one of the exhaust outlet holes 14, and the air guide members 2 at the other exhaust inlet holes 15 are opened towards the other exhaust outlet hole 14. Alternatively, the exhaust cavity 13 is provided with multiple exhaust cavities 13, each of which corresponds to an exhaust outlet hole 14 and multiple exhaust inlet holes 15, and each of the exhaust cavities 13 forms a one-way flow path.

[0041] In order to further improve the flow guiding effect and the plugging effect, in some examples, when the exhaust baffle 3 is in the first position, the extension direction of the exhaust baffle 3 is arranged to be inclined relative to the arrangement direction of the multiple exhaust inlet holes (in the one-way flow exhaust cavity 13, the extension direction of the exhaust baffle 3 is specifically arranged to be inclined relative to the direction from the closed end of the exhaust cavity 13 to the exhaust outlet hole 14). At this time, the exhaust baffle 3 is used to guide the high-temperature substances and gases in the exhaust cavity 13 to flow to the exhaust outlet hole 14, and the high-temperature substances and gases in the exhaust cavity 13 push the exhaust baffle 3 to remain in the first position. For example, as shown in FIG. 6, the exhaust baffle 3 is arranged to be inclined relative to the arrangement direction of the multiple exhaust inlet holes 15. Figure 4As shown, in the process of the high-temperature substances and gases flowing to the front end, the high-temperature substances and gases can push the second exhaust baffle to block the passage to the third exhaust inlet hole, and in turn push the subsequent other exhaust baffles 3 to block the passages to the corresponding exhaust inlet holes 15, so as to avoid the high-temperature substances and gases from flowing to other exhaust holes, and thus not to contact the explosion-proof valves 201 of the other battery cells 200 at the front end of the flow path, so as to protect the other battery cells 200 from being affected by the high-temperature substances and gases. Finally, when the high-temperature substances and gases of the thermal runaway battery cell 200 are introduced into the exhaust assembly 100 from the corresponding exhaust inlet hole 15, they can only flow along the path avoiding the other exhaust inlet holes 15, and are sprayed out from the exhaust outlet hole 14. In addition, the inclined arrangement of the exhaust baffles 3 can better guide the high-temperature substances and gases to flow to the exhaust outlet hole 14, so that the flow is smoother and faster. At this time, the exhaust baffles 3 have both the blocking function and the flow guiding function.

[0042] In order to better isolate the influence of the high-temperature substances and gases on the normal battery cells 200, preferably, the opening of the gas guide member 2 is eccentrically arranged relative to the exhaust inlet hole 15, and the corresponding exhaust inlet hole 15 is isolated from the flow path of the exhaust cavity 13 when the exhaust baffle 3 is in the first position, so that when a certain battery cell 200 is in thermal runaway, the high-temperature substances and gases will not flow above the explosion-proof valve 201 of the normal battery cell 200 at the front end. Specifically, the gas guide member 2 forms a semi-closed structure in the exhaust cavity 13, and when the exhaust baffle 3 is in the first position to block the outlet of the gas guide member 2, the gas guide member 2 and the exhaust baffle 3 isolate an independent island region in the exhaust cavity 13, and the exhaust inlet hole 15 is located in the independent island region to form spatial isolation.

[0043] Referring to Figure 2 and Figure 3 In the embodiment, the exhaust member 1 includes a base 11 and a cover plate 12, the base 11 and the cover plate 12 are made of high-temperature-resistant insulating material, the composition of the high-temperature-resistant insulating material includes silicon, boron and various metal oxides, the base 11 and the cover plate 12 are connected and surround the exhaust cavity 13, the exhaust inlet hole 15 is arranged on the bottom wall 111 of the base 11, the exhaust outlet hole 14 can be arranged between the base 11 and the cover plate 12, or on the base 11 or the cover plate 12, the gas guide member 2 is fixedly connected to the base 11 or the cover plate 12, when the base 11 and the cover plate 12 are connected, the base 11 and the cover plate 12 seal the two sides of the gas guide member 2 to form a semi-closed structure, and the exhaust baffle 3 is preferably pivoted between the base 11 and the cover plate 12 and arranged corresponding to the outlet of the gas guide member 2.

[0044] It should be noted that the connection mode of the base 11 and the cover plate 12 can be that the base 11 and the cover plate 12 are bonded together by using high-temperature-resistant glue, or that the base 11 and the cover plate 12 are connected together by welding, and the connection mode of the base 11 and the cover plate 12 is not limited herein.

[0045] Referring to Figure 3 , preferably, the air guide 2 is integrally connected with the bottom wall 111 of the base 11 and is arranged around the exhaust inlet hole 15, the cover plate 12 is sealed against the air guide 2, the first end of the air guide 2 is connected with one side wall of the base 11, and the second end of the air guide 2 has a gap with one side wall of the base 11 to form an opening. In this way, the high-temperature substances and gases flow on one side of the air guide 2, so that the exhaust baffle 3 is not opened and the normal battery cell 200 is affected.

[0046] Referring to Figure 4 and Figure 5 , preferably, a plurality of air guides 2 are arranged in sequence and staggered, and in the two adjacent air guides 2, one of the air guides 2 is connected with one side wall of the base 11, and the other air guide 2 is connected with the other side wall of the base 11. As shown in Figure 4 , the first end of the first air guide is connected to the first side wall 112 of the base 11, the second end of the first air guide has a gap with the first side wall 112 of the base 11 to form an opening, the first end of the second air guide is connected to the second side wall 113 of the base 11, and the second end of the second air guide has a gap with the second side wall 113 of the base 11 to form an opening, and the third air guide, the fourth air guide, and so on are arranged in sequence and staggered. In this way, the plurality of exhaust inlet holes 15 are arranged in a straight line and arranged centrally on the base 11, and the opening of each air guide 2 is not blocked by the adjacent air guide 2, and more preferably, the flow path of the exhaust cavity 13 is in a snake shape, improving the smoothness of the flow of high-temperature substances and gases in the exhaust cavity 13. More preferably, the first end of the air guide 2 is provided with a first guide surface 21 and a second guide surface 22 at the connection with the side wall of the base 11, and the first guide surface 21 and the second guide surface 22 are oppositely arranged, wherein the first guide surface 21 is located on the outside of the first end of the air guide 2, and the second guide surface 22 is located on the inside of the first end of the air guide 2, the first guide surface 21 is used to guide the flow of high-temperature substances and gases in the exhaust cavity 13, and the first guide surface 21 is used to guide the flow of high-temperature substances and gases in the air guide 2.

[0047] Referring to Figure 3 and Figure 4 , in this embodiment, the first end of the exhaust baffle 3 is pivoted at the second end of the corresponding air guide 2, the second end of the exhaust baffle 3 abuts against the side wall of the base 11 to block the opening of the air guide 2 in the first position, and the second end of the exhaust baffle 3 abuts against the outside of the adjacent air guide 2 to cut off the flow path of the exhaust cavity 13 in the second position. As shown in Figure 4 , the high-temperature substances and gases are introduced from the second exhaust inlet hole, and when the first exhaust baffle is opened, the first exhaust baffle rotates upward and abuts against the outside of the second air guide, thereby blocking the passage to the sealed end; as Figure 5As shown, the high-temperature substance and gas are introduced from the first exhaust inlet hole, and the high-temperature substance and gas push the first exhaust baffle to rotate downward and abut against the first side wall 112 of the base 11 in the process of flowing to the exhaust outlet hole 14, thereby blocking the passage to the second exhaust inlet hole.

[0048] Referring to Figure 3 and Figure 6 , in order to facilitate the installation of the exhaust baffle 3, the first end of the exhaust baffle 3 is provided with a rotating shaft 31, the bottom wall 111 of the base 11 is provided with a first shaft hole 114 corresponding to the rotating shaft 31, and the cover plate 12 is provided with a second shaft hole 121 corresponding to the rotating shaft 31, both ends of the rotating shaft 31 are respectively inserted into the first shaft hole 114 and the second shaft hole 121, so that the exhaust baffle 3 can be clamped and kept normal rotation when the base 11 and the cover plate 12 are connected; the circumferential outer side of the rotating shaft 31 is in close contact with the second end of the air guide piece 2, and the cooperation gap between the circumferential outer side of the rotating shaft 31 and the second end of the air guide piece 2 is preferably controlled at 0.2±0.1mm, which ensures the sealing effect and does not affect the rotation of the exhaust baffle.

[0049] It should be noted that the exhaust baffle 3 can also adopt a structure of elastic deformation or one-time deformation, that is, the corresponding exhaust baffle 3 can be punched and deformed to the second position when the battery cell 200 occurs thermal runaway; or the exhaust baffle 3 can also adopt other structures capable of changing between the first position and the second position to meet the design requirements.

[0050] The technical means disclosed in the present application scheme is not limited to the technical means disclosed in the above-mentioned embodiments, but also includes the technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principle of the present application, some improvements and refinements can be made, which are also considered as the protection scope of the present application.

Claims

1. An exhaust assembly applied to a battery module comprising a plurality of battery cells, characterized in that, The application relates to a battery exhaust device. The battery exhaust device comprises an exhaust part, an exhaust cavity formed in the exhaust part, at least one exhaust outlet hole and a plurality of exhaust inlet holes, the exhaust inlet holes are arranged in sequence towards the exhaust outlet hole, and each exhaust inlet hole is used for guiding high-temperature substances and gas exhausted from a battery cell. A plurality of air guide parts are arranged in the exhaust cavity, at least part of the exhaust inlet holes are provided with the air guide parts, the air guide parts are open towards the exhaust outlet hole, and the air guide parts connect the corresponding exhaust inlet holes with the exhaust cavity. A plurality of exhaust baffles are movably arranged at the openings of the air guide parts, the exhaust baffles have a first position and a second position, when the exhaust baffles are in the first position, the exhaust baffles block the openings of the corresponding air guide parts. The high-temperature substances and gas flowing from the air guide parts to the exhaust cavity can drive the corresponding exhaust baffles to switch from the first position to the second position, when the exhaust baffles are in the second position, the exhaust baffles open the openings of the corresponding air guide parts, and the exhaust baffles cut off the flow path of the exhaust cavity. The exhaust part comprises a base and a cover plate, the base and the cover plate are connected to enclose the exhaust cavity, and the cover plate is sealed against the air guide part.

2. The exhaust assembly of claim 1, wherein, When the exhaust baffles are in the first position, the extension direction of the exhaust baffles is obliquely arranged relative to the arrangement direction of the plurality of exhaust inlet holes.

3. The exhaust assembly of claim 1, wherein, The openings of the air guide parts are eccentrically arranged relative to the exhaust inlet holes, and the exhaust baffles in the first position isolate the corresponding exhaust inlet holes from the flow path of the exhaust cavity.

4. The exhaust assembly of any one of claims 1 to 3, wherein, The exhaust inlet holes are arranged on the bottom wall of the base, the air guide parts are integrally connected with the bottom wall of the base and arranged around the exhaust inlet holes, the first end of the air guide part is connected with one side wall of the base, and the second end of the air guide part has a gap with one side wall of the base to form an opening.

5. The exhaust assembly of claim 4, wherein, The plurality of air guide parts are arranged in sequence and staggered, when one of the air guide parts is connected with one side wall of the base, the other air guide part is connected with the other side wall of the base.

6. The exhaust assembly of claim 5, wherein, The first end of the exhaust baffle is pivoted at the second end of the corresponding air guide part, the second end of the exhaust baffle abuts against the side wall of the base to block the opening of the air guide part in the first position, and the second end of the exhaust baffle abuts against the outside of the adjacent air guide part to cut off the flow path of the exhaust cavity in the second position.

7. The exhaust assembly of claim 6, wherein, The first end of the exhaust baffle is provided with a rotating shaft, the bottom wall of the base is provided with a first shaft hole corresponding to the rotating shaft, the cover plate is provided with a second shaft hole corresponding to the rotating shaft, and the two ends of the rotating shaft are respectively inserted into the first shaft hole and the second shaft hole, and the circumferential outside of the rotating shaft is fitted with the second end of the air guide part.

8. The exhaust assembly of claim 5, wherein, The flow path of the exhaust cavity is in a snake shape.

9. The exhaust assembly of claim 4, wherein, The first end of the air guide part is provided with a first guide surface and a second guide surface, and the first guide surface and the second guide surface are oppositely arranged.

10. The exhaust assembly of claim 1, wherein, The outer side of the exhaust member is further provided with a plurality of bosses, each of which corresponds to one of the exhaust in-holes and is used to fit the outer wall of the periphery of the explosion-proof valve of the battery cell.

11. A battery module, characterized by The battery module comprises a plurality of battery cells and the exhaust assembly according to any one of claims 1 to 10, and the explosion-proof valve of each of the battery cells corresponds to the position of one of the exhaust in-holes of the exhaust assembly.

12. A battery pack, characterized by, The battery module according to claim 11 is applied.

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