Exhaust assembly, battery module and battery pack

Abstract

The exhaust assembly comprises an exhaust part, a plurality of air guide parts and a plurality of exhaust baffles, the air guide parts are arranged in an exhaust cavity of the exhaust part and correspond to exhaust inlet holes, the exhaust baffles are arranged at outlets of the air guide parts, and when the exhaust baffles are located at first positions, the exhaust baffles block openings of the corresponding air guide parts; when the exhaust baffle is located at the second position, the exhaust baffle opens the opening of the corresponding air guide piece, and the exhaust baffle cuts off the circulation path of the exhaust cavity. The exhaust assembly provided by the invention aims to solve the problem that high-temperature substances in the exhaust assembly are easy to accumulate when thermal runaway occurs in the battery cells, and the flow of the high-temperature substances and gas is restrained and guided to a specified direction, so that the high-temperature substances and gas are quickly exhausted and are not easy to accumulate, and further thermal runaway of adjacent battery cells is avoided. The invention also 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] Multiple exhaust baffles are movably disposed at the opening of the air guide component. The exhaust baffles have 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 component. High-temperature substances and gases flowing from the air guide component to the exhaust chamber 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 component and cuts off the flow path of the exhaust chamber.

[0010] Furthermore, when the exhaust baffle is in the first position, the extension direction of the exhaust baffle is inclined relative to the arrangement direction of the multiple exhaust inlets. At this time, the exhaust baffle is used to guide the high-temperature substances and gases in the exhaust chamber to flow towards the exhaust outlet, and the high-temperature substances and gases in the exhaust chamber push the exhaust baffle to remain in the first position.

[0011] Furthermore, the opening of the air guide is eccentrically positioned relative to the exhaust inlet, and when the exhaust baffle is in the first position, it isolates the corresponding exhaust inlet from the flow path of the exhaust chamber.

[0012] Furthermore, the exhaust component includes a base and a cover plate. The base and the cover plate are connected and form an exhaust chamber. An exhaust inlet is provided on the bottom wall of the base. An air guide is integrally connected to the bottom wall of the base and is arranged around the exhaust inlet. The cover plate abuts against the air guide and seals. The first end of the air guide is connected to one side wall of the base, and the second end of the air guide has a gap with one side wall of the base to form an opening.

[0013] Furthermore, multiple air guides are arranged in a staggered manner. When one of two adjacent air guides is connected to one side wall of the base, the other air guide is connected to the other side wall of the base.

[0014] Furthermore, the first end of the exhaust baffle is pivotally connected to the second end of the corresponding air guide. In the first position, the second end of the exhaust baffle abuts against the side wall of the base to block the opening of the air guide. In the second position, the second end of the exhaust baffle abuts against the outer side of the adjacent air guide to cut off the flow path of the exhaust chamber.

[0015] Furthermore, 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, the two ends of the rotating shaft are respectively inserted into the first shaft hole and the second shaft hole, and the outer circumferential side of the rotating shaft is in contact with the second end of the air guide.

[0016] Furthermore, the flow path of the exhaust chamber is serpentine.

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

[0018] Furthermore, the outer side of the exhaust component is provided with multiple protrusions, each protrusion corresponding to an exhaust inlet hole, and each protrusion is used to fit against the outer wall of the explosion-proof valve of the battery cell.

[0019] Based on the same concept, the present invention also discloses a battery module, which includes multiple battery cells and an exhaust assembly as described above, wherein the explosion-proof valve of each battery cell corresponds to an exhaust inlet of the exhaust assembly.

[0020] Based on the same concept, the present invention also discloses a battery pack that uses the battery module described above.

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

[0022] When a cell experiences thermal runaway, high-temperature substances and gases are introduced through the corresponding exhaust inlet. These substances and gases push the corresponding exhaust baffle to a second position, opening the outlet of the gas guide. The gas guide leads the high-temperature substances and gases into the exhaust chamber and rapidly flows towards the exhaust outlet. The exhaust baffle cuts off the flow path within the exhaust chamber, ensuring the high-temperature gas can only flow forward (towards the exhaust outlet), thus preventing it from affecting the normal cells downstream. Furthermore, during the forward flow of the high-temperature substances and gases, the exhaust baffle at the front end is in its first position, preventing them from flowing into the front exhaust inlet and affecting the normal cells there. This prevents the high-temperature substances and gases from flowing into other exhaust inlets, protecting other cells from their influence. Additionally, the rapid outward discharge of the high-temperature gas carries away the high-temperature substances, preventing accumulation and further thermal runaway. Other beneficial effects will be illustrated in the specific embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the battery module structure according to an embodiment of the present invention;

[0024] Figure 2 This is an exploded view of the exhaust assembly according to an embodiment of the present invention;

[0025] Figure 3 for Figure 2 The enlarged view of part A shown below;

[0026] Figure 4 This is one of the schematic diagrams showing the working state of the exhaust assembly according to an embodiment of the present invention;

[0027] Figure 5 This is a second schematic diagram of the working state of the exhaust assembly according to an embodiment of the present invention;

[0028] Figure 6 This is a partial enlarged cross-sectional view of the exhaust assembly according to an embodiment of the present invention.

[0029] The meanings of the reference numerals in the attached figures are as follows:

[0030] 100. Exhaust assembly; 1. Exhaust component; 13. Exhaust chamber; 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 component; 21. First guide surface; 22. Second guide surface; 3. Exhaust baffle; 31. Rotating shaft; 200. Battery cell; 201. Explosion-proof valve. Detailed Implementation

[0031] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[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 this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0034] See Figure 1 and Figure 2 This invention discloses a venting assembly 100 applied in a battery module. The battery module includes the venting assembly 100 and multiple battery cells 200. Each battery cell 200 is equipped with an explosion-proof valve 201. The venting assembly 100 collects and guides the high-temperature substances and gases ejected from the battery cell 200 during thermal runaway, preventing further thermal runaway and aiming to solve the problem of high-temperature substances easily accumulating inside the venting assembly 100 when the battery cell 200 experiences thermal runaway. This invention also discloses a battery pack using this battery module.

[0035] In this embodiment, the exhaust assembly 100 includes an exhaust component 1, multiple air guides 2, and multiple exhaust baffles 3. An exhaust chamber 13 is formed within the exhaust component 1. The exhaust component 1 is also provided with at least one exhaust outlet 14 communicating with the exhaust chamber 13 and multiple exhaust inlets 15 communicating with the exhaust chamber 13. The multiple exhaust inlets 15 are arranged sequentially in the direction towards the exhaust outlet 14. The explosion-proof valve 201 of each battery cell 200 corresponds to a position of an exhaust inlet 15. Each exhaust inlet 15 is used to introduce high-temperature substances and gases discharged from the battery cell 200. The air guides 2 are disposed within the exhaust chamber 13, and at least some of the exhaust inlets 15 are correspondingly provided with air guides 2. The air guides 2 open in the direction towards the exhaust outlet 14, connecting the corresponding exhaust inlets 15 to the exhaust chamber 13. The openings of the multiple air guides 2 face the same direction and are all... The exhaust outlet 14 is oriented towards the exhaust port 14, causing the high-temperature material and gas in the exhaust chamber 13 to flow in the same direction, avoiding backflow and improving flow smoothness and safety. The exhaust baffle 3 is movably disposed at the opening of the air guide 2, and 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 2, and at this time the exhaust baffle 3 plays a protective role. The high-temperature material and gas flowing from the air guide 2 to the exhaust chamber 13 can drive the corresponding exhaust baffle 3 to switch from the first position to the second position. When the exhaust baffle is in the second position, the exhaust baffle 3 opens the opening of the corresponding air guide 2, and the exhaust baffle 3 cuts off the flow path of the exhaust chamber 13, so that the high-temperature material and gas can only flow towards the exhaust outlet 14 and cannot flow towards the closed end.

[0036] The outer side of the exhaust component 1 is provided with multiple protrusions 16, each protrusion 16 corresponding to an exhaust inlet 15. Each protrusion 16 is used to fit against the outer periphery of the explosion-proof valve 201 of the battery cell 200, so as to better introduce the high-temperature substances and gases discharged by the battery cell 200 and reduce the risk of leakage. Of course, the connection between the exhaust component 100 and the explosion-proof valve 201 of the battery cell 200 can also adopt other methods such as indirect connection, which are not limited here.

[0037] As a concrete example, see Figure 2 and combined Figure 4 and Figure 5The exhaust component 1 is generally elongated, with one end closed and the other end having an exhaust outlet 14. Thirteen exhaust inlets 15 are arranged sequentially along the length of the exhaust component 1. Twelve air guides 2 and exhaust baffles 3 are provided, but the air guides 2 and exhaust baffles 3 may be omitted at the exhaust inlets 15 closest to the closed end. It should be noted that the number of air guides 2 and exhaust baffles 3 can be less than or equal to the number of exhaust inlets 15; this is not limited here. Furthermore, the number of air guides 2, exhaust baffles 3, and exhaust inlets 15 can be chosen according to other needs. The exhaust inlets 15 and exhaust outlets 14 can be any shape, such as circular, elliptical, rectangular, or rhomboid. This invention does not limit the specific shape of either the exhaust inlets 15 or the exhaust outlets 14.

[0038] See Figure 4 or Figure 5 and with Figure 4 or Figure 5 As shown in the directional reference, the sealing end is located on the left (defined as the rear end), the exhaust outlet 14 is located on the right (defined as the front end), and multiple exhaust inlets 15 are sequentially defined from left to right as exhaust inlet 1, exhaust inlet 2, ..., N; multiple air guides 2 are sequentially defined from left to right as air guide 1, air guide 2, ..., M; and multiple exhaust baffles 3 are sequentially defined from left to right as exhaust baffle 1, exhaust baffle 2, ..., M. During use, for example... Figure 4 As shown, when the cell 200 corresponding to the second exhaust inlet experiences thermal runaway, high-temperature substances and gases are introduced through the second exhaust inlet. These substances and gases push the first exhaust baffle to the second position, opening the outlet of the first air guide. The first exhaust baffle also cuts off the flow path of the exhaust chamber 13. The first air guide guides the high-temperature substances and gases into the exhaust chamber 13 and rapidly flows towards the exhaust outlet 14 (i.e., towards the front end). Because the first exhaust baffle cuts off the flow path of the exhaust chamber 13, blocking the channel to the sealed end, the high-temperature substances and gases cannot flow and accumulate towards the first exhaust inlet (i.e., cannot flow towards the rear end), thus not affecting the normal cell 200 near the sealed end of the exhaust component 1. During the flow of high-temperature substances and gases towards the front end, the second to M exhaust baffles, located to the right of the second exhaust inlet, are in the first position, preventing the high-temperature substances and gases from flowing into the third to the N exhaust inlet and affecting the normal cell 200 near the exhaust outlet 14. In use, for example... Figure 5As shown, when the cell 200 corresponding to the first exhaust port experiences thermal runaway, high-temperature substances and gases are introduced from the first exhaust port. Since the first exhaust port is closest to the sealing end, the high-temperature substances and gases can quickly flow towards the exhaust port 14 (i.e., towards the front end). During the process of the high-temperature substances and gases flowing towards the front end, all the exhaust baffles 3 located on the right side of the first exhaust port are in the first position, which can prevent the high-temperature substances and gases from flowing from the second exhaust port to the Nth exhaust port and affecting other normal cells 200.

[0039] Thus, the exhaust assembly 100 provided by the present invention uses the built-in air guide 2 for air diversion and the exhaust baffle 3 to cut off the flow path of the exhaust chamber 13, thereby constraining and guiding the flow of high-temperature substances and gases in a specified direction. This can prevent high-temperature substances and gases from flowing to other exhaust inlets 15 and protect other battery cells 200 from the influence of high-temperature substances and gases. In addition, when high-temperature gases are discharged outward quickly, they can carry high-temperature substances with them and discharge them quickly, which is less likely to cause accumulation and avoid further thermal runaway.

[0040] Understandably, in other preferred embodiments, the exhaust component 1 may also be provided with two exhaust outlets 14, which are respectively provided at both ends of the exhaust component 1. In this case, the air guide 2 at part of the exhaust inlet 15 opens toward one of the exhaust outlets 14, and the air guide 2 at the other part of the exhaust inlet 15 opens toward the other exhaust outlet 14. Alternatively, the exhaust chamber 13 may be provided with multiple exhaust chambers, each exhaust chamber 13 having an exhaust outlet 14 and multiple exhaust inlets 15, forming a unidirectional flow path in each exhaust chamber 13.

[0041] To further improve the flow guiding and sealing effects, in some embodiments, when the exhaust baffle 3 is in the first position, the extending direction of the exhaust baffle 3 is inclined relative to the arrangement direction of the multiple exhaust inlets (in the unidirectional flow exhaust chamber 13, specifically, it is inclined relative to the direction from the closed end of the exhaust chamber 13 to the exhaust outlet 14). At this time, the exhaust baffle 3 guides the high-temperature substances and gases in the exhaust chamber 13 towards the exhaust outlet 14, and the high-temperature substances and gases in the exhaust chamber 13 push against the exhaust baffle 3 to maintain it in the first position; for example, ... Figure 4As shown, during the flow of high-temperature substances and gases towards the front end, the high-temperature substances and gases will push against the second exhaust baffle to block the channel leading to the third exhaust inlet. Similarly, this will push subsequent exhaust baffles 3 to block the channels of their corresponding exhaust inlets 15, thus preventing the high-temperature substances and gases from flowing to other exhaust ports and thus avoiding contact with the explosion-proof valves 201 of other battery cells 200 at the front end of the flow path. This protects other battery cells 200 from the influence of high-temperature substances and gases. Finally, when the high-temperature substances and gases from the thermal runaway battery cell 200 are introduced into the exhaust assembly 100 from the corresponding exhaust inlet 15, they can only flow along a path that avoids other exhaust inlets 15 and are ejected from the exhaust outlet 14. Moreover, the inclined arrangement of the exhaust baffles 3 can better guide the high-temperature substances and gases to flow towards the exhaust outlet 14, making their flow smoother and faster. At this time, the exhaust baffles 3 have both a blocking function and a guiding function.

[0042] To better isolate the effects of high-temperature substances and gases on the normal battery cell 200, preferably, the opening of the venting component 2 is offset relative to the exhaust inlet 15. When the exhaust baffle 3 is in the first position, it isolates the corresponding exhaust inlet 15 from the flow path of the exhaust chamber 13, so that in the event of thermal runaway of a battery cell 200, high-temperature substances and gases will not flow above the explosion-proof valve 201 of the front-end normal battery cell 200. Specifically, the venting component 2 forms a semi-closed structure in the exhaust chamber 13. When the exhaust baffle 3 is in the first position to block the outlet of the venting component 2, the venting component 2 and the exhaust baffle 3 isolate an independent island area inside the exhaust chamber 13, and the exhaust inlet 15 is located in this independent island area to form spatial isolation.

[0043] See Figure 2 and Figure 3 In this embodiment, the exhaust component 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 high-temperature resistant insulating material is composed of silicon, boron and various metal oxides. The base 11 and the cover plate 12 are connected and form an exhaust chamber 13. The exhaust inlet 15 is provided on the bottom wall 111 of the base 11. The exhaust outlet 14 can be provided between the base 11 and the cover plate 12. The exhaust outlet 14 can also be provided on the base 11 or the cover plate 12. The air guide component 2 is fixed 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 both sides of the air guide component 2 to form a semi-closed structure. The exhaust baffle 3 is preferably pivotally connected between the base 11 and the cover plate 12 and arranged corresponding to the outlet of the air guide component 2.

[0044] It should be noted that the base 11 and the cover plate 12 can be connected by using high-temperature resistant adhesive or by welding. No limitation is made on the connection method of the base 11 and the cover plate 12 here.

[0045] See Figure 3 Preferably, the air guide 2 is integrally connected to the bottom wall 111 of the base 11 and is arranged around the exhaust inlet 15. The cover plate 12 abuts against and seals the air guide 2. The first end of the air guide 2 is connected to 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, high-temperature substances and gases flow on one side of the air guide 2, which ensures that the exhaust baffle 3 will not be blown open and affect the normal operation of the battery cell 200.

[0046] See Figure 4 and Figure 5 Preferably, multiple air guides 2 are arranged in a staggered manner. In two adjacent air guides 2, when one air guide 2 is connected to one side wall of the base 11, the other air guide 2 is connected to the other side wall of the base 11. Specifically, as follows... Figure 4 As shown, the first end of the first air guide is connected to the first side wall 112 of the base 11, and the second end of the first air guide maintains 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 maintains a gap with the second side wall 113 of the base 11 to form an opening. The third, fourth, ..., and M air guides are staggered in sequence. In this way, multiple exhaust inlets 15 are arranged in a straight line and centrally located on the base 11, and it is ensured that the opening of each air guide 2 is not blocked by adjacent air guides 2. More preferably, the flow path of the exhaust chamber 13 is serpentine, which improves the smoothness of the flow of high-temperature substances and gases in the exhaust chamber 13. More preferably, a first guide surface 21 and a second guide surface 22 are provided at the connection between the first end of the air guide 2 and the side wall of the base 11. The first guide surface 21 and the second guide surface 22 are arranged opposite to each other. The first guide surface 21 is located on the outer side of the first end of the air guide 2, while the second guide surface 22 is located on the inner side 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 chamber 13 and the air guide 2.

[0047] See Figure 3 and Figure 4 In this embodiment, the first end of the exhaust baffle 3 is pivotally connected to the second end of the corresponding air guide 2. In the first position, 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 second position, the second end of the exhaust baffle 3 abuts against the outer side of the adjacent air guide 2 to cut off the flow path of the exhaust chamber 13. Specifically, as follows... Figure 4 As shown, high-temperature substances and gases are introduced through the second exhaust inlet. When the first exhaust baffle is opened, it rotates upward and abuts against the outside of the second air guide, thus blocking the passage to the sealing end; Figure 5As shown, high-temperature substances and gases are introduced through the first exhaust inlet. As the high-temperature substances and gases flow toward the exhaust outlet 14, they push the first exhaust baffle to rotate downward and abut against the first side wall 112 of the base 11, thereby blocking the passage to the second exhaust inlet.

[0048] See Figure 3 and Figure 6 To facilitate the installation of the exhaust baffle 3, a rotating shaft 31 is provided at the first end of the exhaust baffle 3. 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. The two ends of the rotating shaft 31 are respectively inserted into the first shaft hole 114 and the second shaft hole 121. In this way, when the base 11 and the cover plate 12 are connected, the exhaust baffle 3 can be clamped and the exhaust baffle can be rotated normally. The outer circumferential side of the rotating shaft 31 is in contact with the second end of the air guide 2. The fit clearance between the outer circumferential side of the rotating shaft 31 and the second end of the air guide 2 is preferably controlled at 0.2±0.1mm to ensure the sealing effect and not affect the rotation of the exhaust baffle.

[0049] It should be noted that the exhaust baffle 3 can also adopt an elastic deformation or one-time deformation structure, that is, when the battery cell 200 experiences thermal runaway, the corresponding exhaust baffle 3 can be blown open and deformed to the second position; or, the exhaust baffle 3 can also adopt other structures that can change between the first position and the second position, as long as the design requirements are met.

[0050] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. An exhaust assembly, applied to a battery module comprising a plurality of battery cells, characterized in that: include: An exhaust member, wherein an exhaust cavity is formed in the exhaust member, and the exhaust member is further provided with at least one exhaust outlet hole connected to the exhaust cavity and a plurality of exhaust inlet holes connected to the exhaust cavity, wherein the plurality of exhaust inlet holes are sequentially arranged in a direction toward the exhaust outlet hole, and each exhaust inlet hole is used to introduce high-temperature substances and gases discharged from the battery cell; A plurality of air guides, the air guides are arranged in the exhaust cavity, at least some of the exhaust inlet holes are correspondingly provided with the air guides, the air guides are opened in the direction of the exhaust outlet holes, and the air guides connect the corresponding exhaust inlet holes with the exhaust cavity; A plurality of exhaust baffles, each of which is movably disposed at the opening of the air guide, and each of which has a first position and a second position; when the exhaust baffle is in the first position, the exhaust baffle blocks the corresponding opening of the air guide; The high-temperature material and gas flowing from the air guide to the exhaust chamber 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 and cuts off the flow path of the exhaust chamber.

2. The exhaust assembly according to claim 1, characterized in that When the exhaust baffle is in the first position, the extension direction of the exhaust baffle is inclined relative to the arrangement direction of the plurality of exhaust inlet holes.

3. The exhaust assembly according to claim 1, characterized in that The opening of the air guide is eccentrically arranged relative to the exhaust inlet hole, and when the exhaust baffle is in the first position, the corresponding exhaust inlet hole is isolated from the flow path of the exhaust cavity.

4. The exhaust assembly according to any one of claims 1 to 3, characterized in that: The exhaust component includes a base and a cover plate, the base and the cover plate are connected to form the exhaust cavity, the exhaust inlet hole is arranged on the bottom wall of the base, the air guide component is integrally connected to the bottom wall of the base and is arranged around the exhaust inlet hole, the cover plate and the air guide component are sealed against each other, the first end of the air guide component is connected to a side wall of the base, and the second end of the air guide component maintains a gap with a side wall of the base to form an opening.

5. The exhaust assembly according to claim 4, characterized in that The plurality of air guides are arranged alternately in sequence. Among two adjacent air guides, when one of the air guides is connected to one of the side walls of the base, the other air guide is connected to the other side wall of the base.

6. The exhaust assembly according to claim 5, characterized in that The first end of the exhaust baffle is pivotally connected to the second end of the corresponding air guide member. In the first position, the second end of the exhaust baffle abuts against the side wall of the base to block the opening of the air guide member. In the second position, the second end of the exhaust baffle abuts against the outer side of the adjacent air guide member to cut off the flow path of the exhaust chamber.

7. The exhaust assembly according to claim 6, characterized in that A rotating shaft is provided at the first end of the exhaust baffle, a first axial hole corresponding to the rotating shaft is provided at the bottom wall of the base, a second axial hole corresponding to the rotating shaft is provided at the cover plate, two ends of the rotating shaft are respectively inserted into the first axial hole and the second axial hole, and the circumferential outer side of the rotating shaft is in contact with the second end of the air guide.

8. The exhaust assembly according to claim 5, characterized in that The flow path of the exhaust cavity is serpentine.

9. The exhaust assembly according to claim 4, characterized in that A first guide surface and a second guide surface are disposed at a connection point between the first end of the air guide and the side wall of the base, and the first guide surface and the second guide surface are disposed opposite to each other.

10. The exhaust assembly according to claim 1, characterized in that A plurality of bosses are also arranged on the outer side of the exhaust member, each of the bosses is arranged corresponding to one of the exhaust inlet holes, and each of the bosses is used to fit with the outer wall of the periphery of the explosion-proof valve of the battery cell.

11. A battery module, characterized in that: It comprises a plurality of battery cells and an exhaust assembly as claimed in any one of claims 1 to 10, wherein the explosion-proof valve of each battery cell corresponds to a position of an exhaust inlet hole of the exhaust assembly.

12. A battery pack, characterized in that: The battery module as claimed in claim 11 is used.

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