Battery module

Abstract

The embodiment of the utility model provides a battery module which comprises a plurality of batteries and an exhaust structure, an extension part of the exhaust structure is used for being fixedly arranged with a plurality of busbars, and the exhaust structure is connected with the busbars through the extension part so as to be fixed at the tops of the batteries. The exhaust structure is integrally mounted at the top of the battery, so that the overall structure of the battery module is stable, the busbar and the exhaust structure avoid each other, the subsequent connection of the busbar with the negative electrode and the positive electrode is facilitated, and the subsequent sealing fit of the exhaust structure and the anti-explosion valve is also facilitated. The battery module provided by the embodiment of the utility model is simple and stable in overall structure and convenient to mount.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery module. Background Art

[0002] In some battery modules, the positive and negative electrodes of the battery are both set at the top of the battery, and the busbar needs to be set at the top of the battery to electrically connect the positive and negative electrodes to achieve series or parallel connection between multiple batteries. The battery explosion-proof valve is also set at the top of the battery, usually between the positive and negative electrodes. When one or more of the batteries experience thermal runaway, the high-temperature ejecta in the battery will be ejected from the explosion-proof valve and contaminate the surrounding busbars, causing multiple batteries to short-circuit.

[0003] Therefore, in some related technologies, an exhaust structure is provided to guide the discharge of thermal runaway gas. Since the explosion-proof valve is also located at the top of the battery, interference is likely to occur between the exhaust structure and the busbar, which makes it inconvenient to set and fix the exhaust structure. If the exhaust structure covers the top of the battery, it is inconvenient to connect the busbar with the negative and positive electrodes. If the exhaust structure is provided on the busbar, it is easy to cause poor sealing between the exhaust structure and the explosion-proof valve, resulting in leakage of ejected matter. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a battery module, in which the exhaust structure and the bus are integrated at the top of the battery, the exhaust structure and the bus are firmly arranged, and the overall structure of the battery module is simple and easy to install.

[0005] The present application provides a battery module, including:

[0006] A plurality of batteries are arranged along a first direction, each of the batteries having an explosion-proof valve on the top and a positive electrode and a negative electrode respectively arranged on both sides of the explosion-proof valve along a second direction, wherein the first direction intersects with the second direction;

[0007] The exhaust structure includes a main body and extensions connected to both sides of the main body along a second direction, the main body and the extensions both extend along the first direction, the main body is covered on the explosion-proof valves of the plurality of batteries, and the extensions are used to connect to a bus.

[0008] In one embodiment, the main body comprises a top wall, a bottom wall and two side walls, the bottom wall is arranged on the battery, the top wall is arranged on a side of the bottom wall away from the battery, and the side wall is connected between the bottom wall and the top wall;

[0009] The extension portion is connected to the bottom wall, or the side wall, or the top wall;

[0010] The top wall, the bottom wall, and the two side walls enclose an exhaust passage. The exhaust passage extends along the first direction. A plurality of exhaust ports communicating with the exhaust passage are formed in the bottom wall, and one exhaust port corresponds to one explosion-proof valve.

[0011] In one embodiment, the width of the exhaust passage is W, and the height of the exhaust passage is D, where W / D≥17, and the cross-sectional area S of the exhaust passage is ≥180mm 2 .

[0012] In one embodiment, the orthographic projection of the explosion-proof valve on the top of the battery is within the orthographic projection range of the exhaust port on the top of the battery.

[0013] In one embodiment, in the orthographic projection pattern on the top of the battery, the distance between the side line of the explosion-proof valve and the side line of the exhaust port is 1mm - 2mm.

[0014] In one embodiment, the exhaust structure further includes a first reinforcing rib extending along the first direction. The first reinforcing rib is disposed on the side of the bottom wall close to the battery, and the first reinforcing rib is located on at least one side of the exhaust port in the first direction.

[0015] In one embodiment, the total height of the exhaust structure is H, and the thickness of the first reinforcing rib is T, where H / T=(5 - 10).

[0016] In one embodiment, a plurality of avoidance openings are formed in the first reinforcing rib;

[0017] The battery module further includes a plurality of sealing layers. One sealing layer is correspondingly disposed in one avoidance opening. Two sides of the sealing layer respectively abut against the bottom wall and the top of the battery. A through hole is formed in the sealing layer. The through hole is correspondingly disposed with the explosion-proof valve, and the through hole communicates with the exhaust port.

[0018] In one embodiment, the material of the sealing layer is ceramicized silica gel foam, and the compression ratio of the sealing layer is 30% - 60%.

[0019] In one embodiment, the exhaust structure further includes a second reinforcing rib extending along the first direction. The second reinforcing rib is disposed on the side of the extension portion close to the battery.

[0020] In one embodiment, the battery module further includes a plurality of busbars. The plurality of busbars are disposed on the top of the battery and are arranged on both sides of the main body portion along the first direction;

[0021] Each of the bus bars has a first end and a second end. The first end is connected to the corresponding positive electrode or negative electrode. The second end is connected to the extension part through a connecting piece. The second end is arranged between the extension part and the battery, or the second end overlaps the side of the extension part facing away from the battery.

[0022] The beneficial effects of the battery module provided by the embodiment of the present application are as follows: Compared with the related art, the battery module of the embodiment of the present application includes a plurality of batteries and an exhaust structure. Among them, the extension part of the exhaust structure is used for fixedly arranging with a plurality of bus bars. The exhaust structure is fixed on the top of the battery by arranging the extension part to connect the bus bars. The integrated installation of the exhaust structure on the top of the battery makes the overall structure of the battery module stable, and the bus bars and the exhaust structure avoid each other, which is convenient for the subsequent connection of the bus bars with the negative electrode and the positive electrode, and is also convenient for the subsequent sealing cooperation between the exhaust structure and the explosion-proof valve. The overall structure of the battery module provided by the embodiment of the present application is simple, stable and convenient to install. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a three-dimensional structure schematic diagram of the battery module provided by an embodiment of the present application;

[0025] Figure 2 It is a structure schematic diagram of the battery in the battery module provided by an embodiment of the present application;

[0026] Figure 3 It is a cross-sectional structure schematic diagram of the battery module provided by an embodiment of the present application;

[0027] Figure 4 It is a three-dimensional structure schematic diagram of the exhaust structure in the battery module provided by an embodiment of the present application;

[0028] Figure 5 It is a cross-sectional structure schematic diagram of the exhaust structure in the battery module provided by an embodiment of the present application;

[0029] Figure 6 It is a three-dimensional structure schematic diagram of the exhaust structure and the sealing layer in the battery module provided by an embodiment of the present application.

[0030] Among them, the reference numerals in the drawings are as follows:

[0031] Battery module 100; Battery 10; Exhaust structure 20; Busbar 30; Sealing layer 40; Connecting member 50;

[0032] Battery main body 11; Explosion-proof valve 12; Positive electrode 13; Negative electrode 14; Main body portion 21; Extension portion 22; First reinforcing rib 23; Second reinforcing rib 24; First end portion 31; Second end portion 32;

[0033] Top wall 211; Side wall 212; Bottom wall 213; Exhaust passage I; Exhaust port K1; Avoidance port K2; Through hole K3;

[0034] First direction X; Second direction Y. Detailed implementation manner

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0037] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the 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 thus should not be construed as a limitation to the present application.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0039] Please refer to Figures 1 to 6 together, and now a description will be given of the battery module 100 provided by an embodiment of the present application. The battery module 100 of the present application includes a plurality of batteries 10, an exhaust structure 20 and a plurality of busbars 30. As Figure 1As shown, a plurality of batteries 10 are arranged along the first direction X. In this embodiment, the battery 10 is a square battery 10. As Figure 2 shown, each battery 10 includes a battery body 11 and an explosion-proof valve 12, a positive electrode 13, and a negative electrode 14 provided on the battery body 11. That is, the top of each battery 10 has an explosion-proof valve 12 and a positive electrode 13 and a negative electrode 14 respectively provided on both sides of the explosion-proof valve 12 along the second direction Y. The first direction X intersects the second direction Y. In this embodiment, the first direction X and the second direction Y are perpendicular.

[0040] Optionally, the positive electrodes 13 and negative electrodes 14 of two adjacent batteries 10 are arranged in opposite directions. That is, the positive electrode 13 of the first battery 10 is provided on the left side, the negative electrode 14 is provided on the right side, the negative electrode 14 of the second battery 10 is provided on the left side, and the positive electrode 13 is provided on the right side, and so on, so that a plurality of batteries 10 arranged are connected in series.

[0041] The exhaust structure 20 includes a main body portion 21 and two extension portions 22. The main body portion 21 and the extension portions 22 are both extended and arranged along the first direction X. The main body portion 21 covers the explosion-proof valves 12 of the plurality of batteries 10. The two extension portions 22 are extended and arranged on both sides of the main body portion 21 in the first direction X respectively, and the two extension portions 22 are respectively used for connecting with the busbars 30 on the corresponding side.

[0042] A busbar 30 is correspondingly connected to a negative electrode 14 or a positive electrode 13 and is arranged on the top of the battery 10. A plurality of busbars 30 are arranged along the first direction X on both sides of the main body portion 21 and are all connected to the corresponding extension portions 22. Specifically, two busbars 30 are provided on one battery 10 and are respectively connected to the positive electrode 13 and the negative electrode 14. The two busbars 30 are respectively arranged on both sides of the main body portion 21 of the exhaust structure 20. The busbar 30 provided on the first side of the main body portion 21 is fixed to the extension portion 22 provided on the first side of the main body portion 21, and the busbar 30 provided on the second side of the main body portion 21 is fixed to the extension portion 22 provided on the second side of the main body portion 21. The plurality of busbars 30 are arranged in two columns along the first direction X as the plurality of batteries 10 are arranged.

[0043] In this embodiment, the extension portion 22 is made of an insulating material, so that the plurality of busbars 30 are fixed on the extension portion 22 without causing a short circuit. Further, the extension portion 22 and the main body portion 21 are integrally provided and are prepared by extrusion using polyurethane (Thermoplastic Urethane, TPU).

[0044] The battery module 100 provided in the embodiment of the present application includes a plurality of batteries 10 and an exhaust structure 20, wherein the extension portion 22 of the exhaust structure 20 is used to be fixedly arranged with a plurality of busbars 30, and then the exhaust structure 20 is fixed on the top of the battery 10 by connecting the busbar 30 with the positive electrode 13 or the negative electrode 14 of the battery 10, and the busbar 30 and the exhaust structure 20 are integrated and installed on the top of the battery 10 so that the overall structure of the battery module 100 is stable and the busbar 30 and the exhaust structure 20 are mutually avoided, which is convenient for the connection between the busbar 30 and the negative electrode 14 and the positive electrode 13, and also convenient for the subsequent sealing of the exhaust structure 20 and the explosion-proof valve 12. The overall structure of the battery module 100 of the present application is simple and stable, and easy to install. In addition, it can be understood that by fixing the main body 21 on both sides with the extension portion 22 and the plurality of busbars 30 arranged on both sides, the exhaust structure 20 can be further reinforced to prevent the exhaust structure 20 from turning over and moving.

[0045] Further, such as Figure 3 As shown, each busbar 30 has a first end 31 and a second end 32. The first end 31 is connected to the corresponding positive electrode 13 or negative electrode 14, and the second end 32 is overlapped on the side of the extension portion 22 facing away from the battery 10, and is fixedly connected to the extension portion 22 through a connector 50. Specifically, a bending structure is provided between the first end 31 and the second end 32 of the busbar 30, so that after the first end 31 is connected to the positive electrode 13 or negative electrode 14, it can be overlapped on the extension portion 22 for fixation. The main body 21 and the extension portion 22 are arranged on the top of the battery 10 to facilitate cooperation with the explosion-proof valve 12.

[0046] During the installation process, the exhaust structure 20 can be aligned and set on the top of the battery 10, and then the multiple busbars 30 are connected and fixed one by one on the extension part 22 of the exhaust structure 20, and the other end of the busbar 30 is connected to the positive electrode 13 or the negative electrode 14. The exhaust structure 20 is first assembled on the top of the battery 10, and then fixed by multiple busbars 30, which facilitates the overall assembly.

[0047] In this embodiment, the connecting member 50 is a rivet. Specifically, the extension portion 22 is provided with a plurality of through holes so that the connecting member 50 can be passed through and fixed. Optionally, in some other embodiments, the connecting member 50 can also be a screw or the like.

[0048] Optionally, in some other embodiments, the second end 32 of the busbar 30 is disposed between the extension portion 22 and the battery 10, and is fixedly connected to the extension portion 22 via a connector 50. During assembly, the busbar 30 is first connected and fixed to the top of the battery 10, and then the exhaust structure 20 is covered on the battery 10 and the second end 32 of the busbar 30, and then the exhaust structure 20 is connected and fixed to the second end 32 of the busbar 30.

[0049] As shown Figure 3 in FIG. 1, the main body portion 21 includes a top wall 211, a bottom wall 213 and two side walls 212. The bottom wall 213 is disposed on the battery 10, the top wall 211 is disposed on a side of the bottom wall 213 away from the battery 10, and the side walls 212 are connected between the bottom wall 213 and the top wall 211. The extension portion 22 is connected to the side wall 212 of the main body portion 21, so that the distance between the bottom wall 213 and the explosion-proof valve 12 is small, facilitating the gas discharged from the explosion-proof valve 12 to enter the main body portion 21 during thermal runaway.

[0050] Optionally, in some other embodiments, the extension portion 22 may be connected to the bottom wall 213 or the top wall 211.

[0051] As shown Figure 4 in FIG. 2, the top wall 211, the bottom wall 213 and the two side walls 212 enclose an exhaust passage I, the exhaust passage I extends along the first direction X, and a plurality of exhaust ports K1 communicating with the exhaust passage I are formed on the bottom wall 213, and one exhaust port K1 corresponds to one explosion-proof valve 12. The gas discharged from the explosion-proof valve 12 enters the exhaust passage I in the main body portion 21 through the exhaust port K1.

[0052] The exhaust passage I is enclosed by the top wall 211, the bottom wall 213 and the two side walls 212 to guide the gas discharged from the explosion-proof valve 12. In this embodiment, the second end portion 32 of the bus bar 30 is placed on the surface of the exhaust structure 20 away from the battery 10, and the exhaust passage I is enclosed by the top wall 211, the side walls 212 and the bottom wall 213, thereby preventing the high-temperature ejecta from spraying onto the surface of the bus bar 30.

[0053] Furthermore, the orthographic projection of the ejection port of the explosion-proof valve 12 on the top of the battery 10 is within the orthographic projection range of the exhaust port K1 on the top of the battery 10. It can be understood that the exhaust port K1 is larger than the ejection port, so that the high-temperature gas can enter the exhaust passage I from the exhaust port K1 as much as possible, reducing the possibility of high-temperature gas leakage.

[0054] In this embodiment, in the orthographic projection pattern on the top of the battery 10, the distance between the side line of the ejection port of the explosion-proof valve 12 and the side line of the exhaust port K1 is 1 millimeter (mm) - 2 millimeters, such as 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm, etc. It can be understood that if the exhaust port K1 is too small, the gas ejected from the ejection port of the explosion-proof valve 12 cannot completely enter the exhaust passage I from the exhaust port K1. If the exhaust port K1 is too large, the gas ejected from the ejection port of the explosion-proof valve 12 is likely to leak from the edge of the exhaust port K1 to both sides instead of entering the exhaust passage I. The distance between the side line of the ejection port of the explosion-proof valve 12 and the side line of the exhaust port K1 is set to 1 mm - 2 mm to ensure that the high-temperature gas enters the exhaust passage I from the exhaust port K1.

[0055] As Figure 5 shown, the width of the exhaust passage I is W, and the height of the exhaust passage I is D, where W / D≥17. For example, W / D is 17, 17.1, 17.14, 17.5, 17.6, 18, or 19, etc. The exhaust structure 20 is disposed on the top of the battery 10. The height of the exhaust passage I affects the height of the exhaust structure 20, thereby affecting the height of the entire battery module 100. Setting W / D≥17 can reduce the height occupied by the exhaust structure 20, thereby reducing the overall height of the battery module 100 and ensuring the cross-sectional area of the exhaust passage I. In this embodiment, the battery 10 has a specification of LF230, and the gas production rate of the battery 10 is V = 201 L / min. Therefore, the cross-sectional area S of the exhaust passage I is set to be S≥180mm 2 , to ensure that the exhaust passage I can receive the gas discharged from multiple batteries 10.

[0056] Specifically, the top wall 211, the bottom wall 213, and the side wall 212 of the main body 21 enclose an exhaust passage I in a trapezoid-like shape. The length of the upper base of the exhaust passage I is 56 mm, and the length of the lower base is 65 mm, that is, the average length of the exhaust passage I is about 60 mm, and the height of the exhaust passage I is 3.5 mm. Thus, W / D≈17.14 is greater than 17, and the cross-sectional area S is 211mm 2 greater than 180mm 2 .

[0057] As Figure 5 shown, the exhaust structure 20 further includes a first reinforcing rib 23 and a second reinforcing rib 24 extending along the first direction X.

[0058] The first reinforcing rib 23 is disposed on the surface of the bottom wall 213 close to the battery 10, and the first reinforcing rib 23 is located on at least one side of the exhaust port K1 in the first direction X. Specifically, the exhaust structure 20 includes two first reinforcing ribs 23, and the two first reinforcing ribs 23 are respectively disposed on both sides of the exhaust port K1 in the first direction X, that is, the two first reinforcing ribs 23 are symmetrically disposed on the main body 21. The first reinforcing rib 23 is disposed on the surface of the bottom wall 213 close to the battery 10. On the one hand, it can strengthen the structural strength of the main body 21. On the other hand, when the main body 21 is subjected to a downward pressure, the first reinforcing rib 23 can form support and limit for the main body 21.

[0059] The number of the second reinforcing ribs 24 is also two. The two second reinforcing ribs 24 are respectively arranged on two extension parts 22 on both sides of the main body part 21. A first reinforcing rib 23 is arranged on one extension part 22. On the one hand, the structural strength of the extension part 22 can be enhanced. On the other hand, when the extension part 22 is subjected to a downward pressure, the second reinforcing rib 24 can form support and limit for the extension part 22. Further, the thickness of the second reinforcing rib 24 is equal to the thickness of the extension part 22, which can greatly enhance the structural strength of the extension part 22. Specifically, the thickness of the second reinforcing rib 24 is 2 mm, and the thickness of the extension part 22 is 2 mm.

[0060] Optionally, the total height of the exhaust structure 20 is H, and the thickness of the first reinforcing rib 23 is T, wherein, H / T = (5 - 10), for example, H / T = 5, H / T = 6, H / T = 7, H / T = 8, H / T = 9 or H / T = 10, etc. In this embodiment, the total height H of the exhaust structure 20 is 8 mm, and the thickness T of the first reinforcing rib 23 is 1 mm, so that H / T = 8.

[0061] Optionally, in some other embodiments, the total height H of the exhaust structure 20 is 10 mm, and the thickness T of the first reinforcing rib 23 is 2 mm, so that H / T = 5.

[0062] It can be understood that there is a hollow exhaust passage I in the main body part 21. If the first reinforcing rib 23 is set too thick on the bottom wall 213, it is easy to cause the deformation of the bottom wall 213, which is instead not conducive to strengthening the structural strength of the main body part 21. Therefore, setting H / T = (5 - 10) can strengthen the structural strength of the main body part 21 while avoiding the first reinforcing rib 23 being too thick.

[0063] As Figure 6 shown, to strengthen the connection sealing performance between the exhaust structure 20 and the explosion-proof valve 12, the battery module 100 further includes a plurality of sealing layers 40. A sealing layer 40, an exhaust port K1 and an explosion-proof valve 12 are correspondingly arranged. The sealing layer 40 is arranged between the exhaust structure 20 and the explosion-proof valve 12, and two sides of the sealing layer 40 respectively abut against the bottom wall 213 and the top of the battery 10. A through hole K3 is formed in the sealing layer 40, the through hole K3 is correspondingly arranged with the explosion-proof valve 12, and the through hole K3 is communicated with the exhaust port K1. The through hole K3 is used for allowing the gas discharged by the explosion-proof valve 12 to pass through. The arrangement of the sealing layer 40 can strengthen the connection sealing performance between the exhaust structure 20 and the explosion-proof valve 12, and avoid the gas discharged by the explosion-proof valve 12 from leaking from the gap between the exhaust structure 20 and the battery 10. Specifically, a plurality of avoiding holes K2 are formed in the first reinforcing rib 23, and a sealing layer 40 is correspondingly arranged in one avoiding hole K2. The first reinforcing rib 23 can limit and fix the sealing layer 40 to avoid the movement of the sealing layer 40.

[0064] In this embodiment, the material of the sealing layer 40 is ceramized silica gel foam. During the assembly process of the battery module 100, when the bus bar 30 is welded to the positive electrode 13 and the negative electrode 14 of the battery 10, a downward pressure will be generated on the bus bar 30 and the exhaust structure 20. This downward pressure is transmitted to the sealing layer 40, and the sealing layer 40 is compressed under the pressure, further ensuring the sealing performance between the exhaust structure 20 and the explosion-proof valve 12.

[0065] In addition, when the ceramized silica gel foam is sprayed with high-temperature gas, it will sinter and solidify, maintaining its original state without being burned. Since the sealing layer 40 is made of ceramized silica gel foam, it can also resist the high-temperature impact during thermal runaway.

[0066] Optionally, the compression ratio of the sealing layer 40 is 30%-60%, such as 30%, 35%, 40%, 45%, 50%, 55% or 60%, etc. On the one hand, when the bus bar 30 is welded to the positive electrode 13 and the negative electrode 14, the sealing layer 40 provides a certain buffering capacity for the exhaust structure 20. On the other hand, the compression of the sealing layer 40 under pressure can further improve the sealing performance. Specifically, in this embodiment, the compression ratio of the sealing layer 40 is 40%. Before being compressed, the thickness of the sealing layer 40 is 2.5 mm, and after being compressed, the thickness of the sealing layer 40 is 1.5 mm.

[0067] The above is the description of the battery module 100 provided by the embodiments of the present application.

[0068] The battery module provided by the embodiments of the present application includes multiple batteries and an exhaust structure. The extension part of the exhaust structure is used for fixedly setting with multiple bus bars. The exhaust structure is fixed on the top of the battery by connecting the bus bars through the extension part. The integrated installation of the exhaust structure on the top of the battery makes the overall structure of the battery module stable, and the bus bar and the exhaust structure form an avoidance of each other, which is convenient for the subsequent connection of the bus bar with the negative electrode and the positive electrode, and is also convenient for the subsequent sealing cooperation between the exhaust structure and the explosion-proof valve. The overall structure of the battery module provided by the embodiments of the present application is simple, stable and easy to install.

[0069] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery module, characterized in that, include: A plurality of batteries are arranged along a first direction, each of the batteries having an explosion-proof valve on the top and a positive electrode and a negative electrode respectively arranged on both sides of the explosion-proof valve along a second direction, wherein the first direction intersects with the second direction; The exhaust structure includes a main body and extensions connected to both sides of the main body along a second direction, the main body and the extensions both extend along the first direction, the main body is covered on the explosion-proof valves of the plurality of batteries, and the extensions are used to connect to a bus.

2. The battery module according to claim 1, characterized in that, The main body comprises a top wall, a bottom wall and two side walls, the bottom wall is arranged on the battery, the top wall is arranged on a side of the bottom wall away from the battery, and the side wall is connected between the bottom wall and the top wall; The extension portion is connected to the bottom wall, or the side wall, or the top wall; The top wall, the bottom wall and the two side walls are arranged to form an exhaust channel, the exhaust channel extends along the first direction, a plurality of exhaust ports connected to the exhaust channel are arranged on the bottom wall, and one exhaust port corresponds to one explosion-proof valve.

3. The battery module according to claim 2, wherein The width of the exhaust passage is W, and the height of the exhaust passage is D, where W / D ≥ 17, and the cross-sectional area S of the exhaust passage is ≥ 180 mm 2 .

4. The battery module according to claim 2, characterized in that, The orthographic projection of the explosion-proof valve on the top of the battery is located within the orthographic projection range of the exhaust port on the top of the battery.

5. The battery module according to claim 4, wherein In the orthographic projection pattern of the top of the battery, the distance between the edge line of the explosion-proof valve and the edge line of the exhaust port is 1 mm-2 mm.

6. The battery module according to claim 2, characterized in that The exhaust structure further includes a first reinforcing rib extending along the first direction, the first reinforcing rib being arranged on a side of the bottom wall close to the battery, and the first reinforcing rib being located on at least one side of the exhaust port in the first direction.

7. The battery module according to claim 6, characterized in that, The total height of the exhaust structure is H, and the thickness of the first reinforcing rib is T, wherein H / T=5-10.

8. The battery module according to claim 6, wherein, The first reinforcing rib is provided with a plurality of avoidance openings; The battery module also includes multiple sealing layers, one of the sealing layers is correspondingly arranged in one of the avoidance ports, two sides of the sealing layer respectively abut the bottom wall and the top of the battery, a through hole is opened on the sealing layer, the through hole is correspondingly arranged with the explosion-proof valve, and the through hole is connected with the exhaust port.

9. The battery module according to claim 8, characterized in that, The material of the sealing layer is ceramic silica foam, and the compression ratio of the sealing layer is 30%-60%.

10. The battery module according to claim 2, wherein, The exhaust structure further includes a second reinforcing rib extending along the first direction, and the second reinforcing rib is arranged on a side of the extension portion close to the battery.

11. The battery module according to claim 1, characterized in that, The battery module further includes a plurality of bus bars, which are arranged on the top of the battery and arranged on both sides of the main body along the first direction; Each of the busbars has a first end and a second end, the first end is connected to the corresponding positive electrode or the negative electrode, the second end is connected to the extension portion through a connecting member, the second end is arranged between the extension portion and the battery, or the second end is overlapped on a side of the extension portion facing away from the battery.

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