Battery pack exhaust device and battery pack

Abstract

This utility model relates to the field of battery pack technology and discloses a battery pack flue gas emission device and a battery pack, including: an emission pipe enclosing a flue gas channel, the emission pipe having a flue gas inlet and a flue gas outlet spaced apart, both of which are connected to the flue gas channel; the emission pipe having a first wall and a second wall spaced apart, the first wall and / or the second wall being recessed towards the flue gas channel to form a receiving groove; and a phase change heat absorption structure disposed within the receiving groove for cooling the high-temperature flue gas flowing through the emission pipe. In this utility model, the high-temperature flue gas inside the battery pack enters through the flue gas inlet and exits through the emission pipe and the flue gas outlet. Furthermore, the phase change heat absorption structure located within the receiving groove cools the high-temperature flue gas flowing through the emission pipe, thereby reducing the temperature of the flue gas discharged by the emission device to a safe temperature, preventing excessively high flue gas temperatures from igniting other structures outside the battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, specifically to a battery pack flue gas emission device and a battery pack. Background Technology

[0002] During battery pack operation, thermal runaway of a single battery can spread to surrounding batteries, triggering a chain reaction. The smoke, fire, and explosion generated during this thermal runaway directly threaten the safety of drivers, passengers, and users. Therefore, the design of the battery pack enclosure needs to consider the exhaust of gases from the internal batteries during thermal runaway through venting channels. In existing technologies, the smoke generated during battery thermal runaway is typically discharged to the external environment via ducts. However, the discharged smoke is often too hot, and direct contact with the air can cause it to ignite. Utility Model Content

[0003] In view of this, the present invention provides a battery pack flue gas emission device and a battery pack to solve the problem in the prior art where the flue gas emitted from the battery pack is too hot and the flue gas directly contacts the air, which may cause the flue gas to catch fire.

[0004] In a first aspect, this utility model provides a battery pack flue gas emission device, comprising: an emission pipe enclosing a flue gas channel, the emission pipe having a flue gas inlet and a flue gas outlet spaced apart, both the flue gas inlet and the flue gas outlet being connected to the flue gas channel; the emission pipe having a first wall and a second wall spaced apart from each other, the first wall and / or the second wall being recessed toward the flue gas channel to form a receiving groove; and a phase change heat absorption structure disposed within the receiving groove for cooling the high-temperature flue gas flowing through the interior of the emission pipe.

[0005] Beneficial effects: High-temperature flue gas inside the battery pack enters through the flue gas inlet and exits through the flue gas outlet via the exhaust pipe. Furthermore, the phase change heat absorption structure located in the containment tank cools the high-temperature flue gas flowing through the exhaust pipe, thereby reducing the temperature of the flue gas discharged by the flue gas emission device to a safe temperature, preventing the flue gas temperature from being too high and causing fires in other structures outside the battery pack.

[0006] In one optional embodiment, the first wall body includes a first wall segment, a first groove sidewall, and a first groove bottom wall. A plurality of first wall segments are spaced apart. The first groove sidewalls are connected at a predetermined angle to the sides of two adjacent first wall segments. The first groove sidewalls extend toward the second wall body. The two first groove sidewalls located between two adjacent first wall segments are spaced apart. The first groove bottom wall connects the ends of the two first groove sidewalls that are close to the second wall body. The two first groove sidewalls and the first groove bottom wall enclose the receiving groove.

[0007] Beneficial effects: The discharge pipe and the receiving tank are separated by the two side walls and the bottom wall of the first tank. The high-temperature flue gas flows through the discharge pipe without entering the receiving tank, so that the discharge pipe and the receiving tank can exchange heat through the side walls and the bottom wall of the first tank, thereby avoiding the high-temperature flue gas from directly contacting the phase change heat absorption structure and causing a chemical reaction.

[0008] In one alternative embodiment, the first tank bottom wall and the second wall are spaced apart.

[0009] Beneficial effects: It connects the entire exhaust pipeline, avoids complete separation of the exhaust pipeline, improves the flow of high-temperature flue gas, and enhances the cooling effect and exhaust rate.

[0010] In one optional embodiment, the second wall body includes a second wall segment, a second groove sidewall, and a second groove bottom wall. A plurality of second wall segments are spaced apart. The second groove sidewalls are connected at a predetermined angle to the sides of two adjacent second wall segments. The second groove sidewalls extend toward the first wall body. The two second groove sidewalls located between two adjacent second wall segments are spaced apart. The second groove bottom wall connects the ends of the two second groove sidewalls that are close to the first wall body. The two second groove sidewalls and the second groove bottom wall enclose the receiving groove.

[0011] Beneficial effects: The discharge pipe and the receiving tank are separated by the two side walls and the bottom wall of the second tank. The high-temperature flue gas flows through the discharge pipe without entering the receiving tank, so that the discharge pipe and the receiving tank can exchange heat through the side walls and the bottom wall of the second tank. This avoids the high-temperature flue gas from coming into direct contact with the phase change heat absorption structure and causing a chemical reaction.

[0012] In one alternative embodiment, the bottom wall of the second tank is spaced apart from the first wall.

[0013] Beneficial effects: It connects the entire exhaust pipeline, avoids complete separation of the exhaust pipeline, improves the flow of high-temperature flue gas, and enhances the cooling effect and exhaust rate.

[0014] In one alternative embodiment, the first groove sidewall and the second groove sidewall are arranged at a distance from each other.

[0015] Beneficial effects: When high-temperature flue gas flows through the discharge pipe, the phase change heat absorption structure in the receiving groove of the first wall and the phase change heat absorption structure in the receiving groove of the second wall can both cool down the high-temperature flue gas and improve the cooling effect of the high-temperature flue gas.

[0016] In one optional embodiment, each of the first wall sections is provided with the flue gas outlet; and / or,

[0017] The battery pack exhaust device also includes a protective structure, which is disposed on the outside of the exhaust pipe and covers the second wall.

[0018] Beneficial effects: Increases the opening range of flue gas outlet and improves the emission rate of flue gas; by setting up a protective structure to cover the second wall, it avoids direct contact between high-temperature flue gas and the phase change heat absorption structure, thus preventing chemical reactions.

[0019] In one optional embodiment, the battery pack flue gas emission device further includes a sealing structure disposed within the receiving groove and near the flue gas inlet.

[0020] Beneficial effects: By setting up a sealing structure to seal the end of the receiving tank near the flue gas inlet, when high-temperature flue gas enters the emission pipe from the flue gas inlet, it is prevented from entering the receiving tank, thereby preventing the high-temperature flue gas from directly contacting the phase change heat absorption structure and causing a chemical reaction.

[0021] Secondly, this utility model also provides a battery pack, including: a housing with an exhaust port; the aforementioned battery pack flue gas emission device is disposed in the housing, the flue gas inlet is connected to the interior of the housing, and the flue gas outlet is connected to the exhaust port.

[0022] Beneficial effects: The high-temperature flue gas inside the battery pack enters through the flue gas inlet, exits through the flue gas outlet via the exhaust pipe, and is finally discharged to the outside of the battery pack through the exhaust port. Furthermore, the phase change heat absorption structure located in the containment tank is used to cool the high-temperature flue gas flowing through the exhaust pipe, thereby reducing the temperature of the flue gas discharged from the battery pack to a safe temperature, preventing the flue gas temperature from being too high and causing fires in other structures outside the battery pack.

[0023] In one optional embodiment, the inner wall surface of the housing where the discharge port is located is provided with a heat insulation layer.

[0024] Beneficial effects: By setting up a heat insulation layer to protect the inner wall of the box, the structure of the box can be prevented from being damaged or even burned through when high-temperature flue gas is directly injected into it. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1This is a schematic diagram of the structure of an exhaust pipe according to an embodiment of the present utility model;

[0027] Figure 2 for Figure 1 The diagram shows a structural schematic of the discharge pipe from another angle.

[0028] Figure 3 This is a schematic diagram of the mating structure of the discharge pipe and the top cover according to an embodiment of the present utility model;

[0029] Figure 4 for Figure 3 A top view of the discharge pipe and top cover shown;

[0030] Figure 5 for Figure 4 A cross-sectional view along the AA direction;

[0031] Figure 6 for Figure 5 A magnified view of part B in the diagram;

[0032] Figure 7 This is a schematic diagram of the battery pack structure according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Emission duct; 11. Flue gas inlet; 12. Flue gas outlet; 13. First wall; 131. First wall section; 132. First tank sidewall; 133. First tank bottom wall; 14. Second wall; 141. Second wall section; 142. Second tank sidewall; 143. Second tank bottom wall; 2. Receiving tank; 3. Protective structure; 4. Sealing structure; 10. Flue gas emission device; 20. Box; 201. Emission port; 202. Box body; 203. Top cover; 30. Insulation layer. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0037] According to an embodiment of the present invention, a battery pack flue gas emission device 10 is provided, comprising: an emission pipe 1 enclosing a flue gas channel, the emission pipe 1 having a flue gas inlet 11 and a flue gas outlet 12 spaced apart, both the flue gas inlet 11 and the flue gas outlet 12 being connected to the flue gas channel, the emission pipe 1 having a first wall 13 and a second wall 14 spaced apart, the first wall 13 and / or the second wall 14 being recessed toward the flue gas channel to form a receiving groove 2; and a phase change heat absorption structure disposed in the receiving groove 2 for cooling the high-temperature flue gas flowing through the interior of the emission pipe 1.

[0038] In the battery pack flue gas emission device 10 of this embodiment, the high-temperature flue gas inside the battery pack housing 20 enters through the flue gas inlet 11 and is discharged through the flue gas outlet 12 via the emission pipe 1. Furthermore, the phase change heat absorption structure located in the receiving tank 2 is used to cool down the high-temperature flue gas flowing through the emission pipe 1, thereby reducing the temperature of the flue gas discharged by the flue gas emission device 10 to a safe temperature, preventing the flue gas temperature from being too high and causing fires in other structures outside the battery pack.

[0039] It is worth noting that the phase change endothermic structure uses a phase change material. A phase change material is a substance that changes its state of matter while maintaining a constant temperature and can provide latent heat. The process of changing physical properties is called a phase change process, during which the phase change material will absorb or release a large amount of latent heat.

[0040] It should be further explained that latent heat, short for latent heat of phase change, refers to the heat absorbed or released by a substance when it changes from one phase to another under isothermal and isobaric conditions. This is one of the characteristics of a substance when it transforms between solid, liquid, and gas phases, as well as between different solid phases.

[0041] Optionally, in this embodiment, the phase change material is made from a high-enthalpy hydrated salt.

[0042] It is worth noting that in the relevant technologies, the exhaust design of the battery pack is mainly to discharge the smoke generated rapidly by the batteries in the battery pack to prevent safety accidents such as battery pack explosion. However, the relevant technologies do not have a cooling design for the high-temperature smoke inside the battery pack housing 20. Therefore, when a battery near the exhaust port 201 of the housing 20 fails, it may cause high-temperature jets or even flames to be directly discharged from the housing 20, causing secondary damage.

[0043] In this embodiment, the exhaust pipe 1 is used to plan the exhaust path for the battery modules in the battery pack, and the first wall 13 and / or the second wall 14 of the exhaust pipe 1 are formed to form a receiving groove 2 for adding phase change material, so as to absorb heat and cool down the high temperature flue gas in the exhaust pipe 1. While ensuring the smooth discharge of flue gas, the temperature of the flue gas at the exhaust port 201 is reduced, so as to avoid the fire and combustion of other structures outside the battery pack and avoid secondary injury events.

[0044] Specifically, in one embodiment, such as Figure 6 As shown, the first wall 13 includes a first wall segment 131, a first groove sidewall 132, and a first groove bottom wall 133. Several first wall segments 131 are spaced apart. The first groove sidewalls 132 are connected at a predetermined angle to the sides of two adjacent first wall segments 131. The first groove sidewalls 132 extend toward the second wall 14. The two first groove sidewalls 132 located between two adjacent first wall segments 131 are spaced apart. The first groove bottom wall 133 connects the ends of the two first groove sidewalls 132 that are close to the second wall 14. The two first groove sidewalls 132 and the first groove bottom wall 133 enclose each other to form a receiving groove 2. With this configuration, the discharge pipe 1 and the receiving tank 2 are separated by the two first tank side walls 132 and the first tank bottom wall 133. The high-temperature flue gas flows through the discharge pipe 1 without entering the receiving tank 2, so that the discharge pipe 1 and the receiving tank 2 can exchange heat through the first tank side walls 132 and the first tank bottom wall 133, thereby avoiding the high-temperature flue gas from directly contacting the phase change heat absorption structure and causing a chemical reaction.

[0045] It is worth noting that, please refer to Figure 1 The battery pack flue gas emission device 10 has a first direction, a second direction, and a third direction that intersect in pairs. Several first wall sections 131 are spaced apart along the first direction, and two first groove sidewalls 132 between adjacent first wall sections 131 are spaced apart relative to each other along the first direction. The receiving groove 2 extends along the second direction, and the flue gas inlet 11 and flue gas outlet 12 are spaced apart along the second direction. The first groove sidewalls 132 extend towards the second wall 14 along the third direction.

[0046] Furthermore, in one embodiment, such as Figure 6 As shown, the bottom wall 133 of the first tank and the second wall 14 are spaced apart. This arrangement ensures that the discharge pipe 1 is fully connected, avoiding complete separation of the discharge pipe 1, improving the flow of high-temperature flue gas, and enhancing the cooling effect and exhaust rate.

[0047] It is worth noting that the first groove bottom wall 133 and the second wall 14 are spaced apart relative to each other along a third direction. Therefore, the spaces located on opposite sides of the two first groove side walls 132 along the first direction can be connected.

[0048] Specifically, in one embodiment, such as Figure 6 As shown, the second wall 14 includes a second wall segment 141, a second groove sidewall 142, and a second groove bottom wall 143. Several second wall segments 141 are spaced apart. Second groove sidewalls 142 are connected at a predetermined angle to the sides of adjacent second wall segments 141. The second groove sidewalls 142 extend towards the first wall 13. Two second groove sidewalls 142 located between adjacent second wall segments 141 are spaced apart. The second groove bottom wall 143 connects the ends of the two second groove sidewalls 142 closest to the first wall 13. The two second groove sidewalls 142 and the second groove bottom wall 143 enclose and form a receiving groove 2. This arrangement separates the discharge pipe 1 and the receiving groove 2 through the two second groove sidewalls 142 and the second groove bottom wall 143. High-temperature flue gas flows through the discharge pipe 1 without entering the receiving groove 2, allowing heat exchange between the discharge pipe 1 and the receiving groove 2 via the second groove sidewalls 142 and the second groove bottom wall 143. This prevents the high-temperature flue gas from directly contacting the phase change heat absorption structure and undergoing a chemical reaction.

[0049] It is worth noting that there are several second wall segments 141 spaced apart along the first direction, and the two second groove sidewalls 142 between two adjacent second wall segments 141 are spaced apart relative to each other along the first direction. The first wall segments 131 and the second wall segments 141 are spaced apart relative to each other along the third direction, and the second groove sidewalls 142 extend toward the first wall body 13 along the third direction.

[0050] Furthermore, in one embodiment, such as Figure 6 As shown, the bottom wall 143 of the second tank is spaced apart from the first wall 13. This arrangement ensures that the discharge pipe 1 is fully connected, avoiding complete separation of the discharge pipe 1, improving the flow of high-temperature flue gas, and enhancing the cooling effect and exhaust rate.

[0051] It is worth noting that the bottom wall 143 of the second trench and the first wall 13 are spaced apart relative to each other along a third direction. Therefore, the spaces located on opposite sides of the two second trench sidewalls 142 along the first direction can be connected.

[0052] In one embodiment, such as Figure 6 As shown, the first tank sidewall 132 and the second tank sidewall 142 are arranged at intervals relative to each other. With this arrangement, when high-temperature flue gas flows through the discharge pipe 1, the phase change heat absorption structure in the receiving tank 2 of the first wall 13 and the phase change heat absorption structure in the receiving tank 2 of the second wall 14 can both cool the high-temperature flue gas, thereby improving the cooling effect of the high-temperature flue gas.

[0053] It is worth noting that, along the first direction, a set of first groove sidewalls 132 (that is, two first groove sidewalls 132 between two adjacent first wall segments 131) and a set of second groove sidewalls 142 (that is, two second groove sidewalls 142 between two adjacent second wall segments 141) are arranged alternately and at intervals.

[0054] In one embodiment, such as Figure 1 As shown, each first wall section 131 is provided with a flue gas outlet 12. This arrangement can increase the opening range of the flue gas outlet 12 and improve the emission rate of the flue gas.

[0055] In one embodiment, such as Figure 5 and Figure 6 As shown, the battery pack flue gas emission device 10 also includes a protective structure 3, which is located outside the emission pipe 1 and covers the second wall 14. By providing the protective structure 3 to cover the second wall 14, the high-temperature flue gas is prevented from directly contacting the phase change heat absorption structure and causing a chemical reaction.

[0056] It is worth noting that, such as Figure 5 As shown, the first wall 13 is used to abut against the battery pack housing 20 so that the flue gas outlet 12 is connected to the exhaust port 201 of the housing 20. Therefore, the battery pack housing 20 can cover the receiving groove 2 on the first wall 13. In addition, the protective structure 3 covers the receiving groove 2 on the second wall 14, thereby preventing the high-temperature flue gas from directly contacting the phase change heat absorption structure and causing a chemical reaction.

[0057] Specifically, protective structure 3 can be made of steel plate.

[0058] It should be noted that in this embodiment, both the first wall 13 and the second wall 14 are provided with receiving grooves 2. Of course, in other alternative embodiments, the receiving groove 2 may be formed only in the first wall 13 or only in the second wall 14.

[0059] In one embodiment, such as Figure 1 As shown, the battery pack flue gas emission device 10 also includes a sealing structure 4, which is disposed within the receiving tank 2 and located near the flue gas inlet 11. By sealing the end of the receiving tank 2 near the flue gas inlet 11 with the sealing structure 4, when high-temperature flue gas enters the emission pipe 1 from the flue gas inlet 11, it prevents the high-temperature flue gas from entering the receiving tank 2, thereby preventing the high-temperature flue gas from directly contacting the phase change heat absorption structure and causing a chemical reaction.

[0060] It is worth noting that, please refer to Figure 1 and Figure 2The discharge pipe 1 is open at its first end along the second direction to form a flue gas inlet 11, and closed at its second end along the second direction. A flue gas outlet 12 is located in the first wall section 131 and near the second end. A sealing structure 4 is located within the receiving groove 2 and near the first end. This design extends the flow path of the high-temperature flue gas and provides sufficient space for the phase change heat absorption structure, maximizing the flow time of the high-temperature gas within the discharge pipe 1 and thus maximizing the heat absorption time, effectively reducing the temperature of the high-temperature flue gas flowing through the discharge pipe 1.

[0061] According to an embodiment of the present invention, another aspect provides a battery pack, including: a housing 20 with an exhaust port 201; the aforementioned battery pack flue gas emission device 10 is disposed inside the housing 20, with a flue gas inlet 11 communicating with the interior of the housing 20 and a flue gas outlet 12 communicating with the exhaust port 201.

[0062] In the battery pack of this embodiment, the high-temperature flue gas inside the battery pack housing 20 enters through the flue gas inlet 11, exits through the exhaust pipe 1 and exits through the flue gas outlet 12, and is finally discharged to the outside of the battery pack through the exhaust port 201. Furthermore, the phase change heat absorption structure located in the receiving tank 2 is used to cool the high-temperature flue gas flowing through the exhaust pipe 1, thereby reducing the temperature of the flue gas discharged from the battery pack to a safe temperature. This prevents the flue gas temperature from being too high and causing fires in other structures outside the battery pack, thus avoiding secondary damage and improving the overall safety of the battery pack.

[0063] In this embodiment, as Figure 4 As shown, the discharge port 201 is an elongated structure extending along the first direction, so as to correspond and communicate with the flue gas outlets 12 opened on several first wall sections 131.

[0064] Furthermore, in one embodiment, such as Figure 6 As shown, the inner wall of the housing 20, which has an exhaust port 201, is provided with a heat insulation layer 30. By providing the heat insulation layer 30, the inner wall of the housing 20 is protected to prevent high-temperature flue gas from directly spraying onto the housing 20 and causing damage or even burn-through to the structure of the housing 20.

[0065] It is worth noting that the first wall 13 is fitted together with the insulation layer 30.

[0066] Specifically, the insulation layer 30 can be a mica board.

[0067] In one embodiment, the discharge port 201 is covered with a waterproof and breathable membrane. Using this membrane, gas inside the battery pack housing 20 can be discharged through it. Furthermore, when the gas pressure inside the discharge pipe 1 becomes too high, the gas can push open the membrane, enabling rapid discharge of fumes from the battery pack housing 20. This prevents safety accidents such as battery pack explosions and improves the safety performance of the battery pack.

[0068] In one embodiment, such as Figure 7 As shown, the housing 20 includes a housing body 202 and a top cover 203 connected together. The exhaust port 201 is opened on the top cover 203, and the battery pack exhaust device 10 is disposed inside the top cover 203.

[0069] Specifically, the waterproof and breathable membrane is an PETFE (polytetrafluoroethylene) membrane. The waterproof and breathable membrane is connected to the upper cover 203 and covers the discharge port 201 by ultrasonic welding.

[0070] Furthermore, the orthographic projection of the battery pack flue gas emission device 10 on the top surface of the cover 203 can occupy a large area of ​​the top surface of the cover 203, thereby maximizing the extension of the flow path of the high-temperature flue gas, maximizing the flow time of the high-temperature gas in the emission pipe 1, thereby maximizing the heat absorption time and effectively reducing the temperature of the high-temperature flue gas flowing through the emission pipe 1.

[0071] When the battery inside the battery pack of this embodiment is ejected, a high-temperature jet of particulate matter is ejected from the battery along with high-temperature gas. The high-temperature jet and high-temperature gas enter the space of the upper cover 203. As the battery ejection time increases, the air pressure and temperature in the space of the upper cover 203 gradually increase. The high-temperature and high-pressure gas has nowhere to be released and can only enter the exhaust pipe 1 through the flue gas inlet 11. When the high-temperature flue gas enters the exhaust pipe 1, the phase change heat absorption structure in the receiving tank 2 absorbs heat and decomposes, thereby rapidly cooling the high-temperature flue gas. As the air pressure inside the exhaust pipe 1 increases, the gas can push open the waterproof and breathable membrane. The high-temperature flue gas flows through the entire exhaust pipe 1 and, after being extinguished and cooled, the flue gas below the combustible temperature is discharged from the exhaust port 201.

[0072] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack fume exhaust device, characterized by, include: An exhaust pipe (1) is enclosed to form a flue gas passage. The exhaust pipe (1) has a flue gas inlet (11) and a flue gas outlet (12) arranged at intervals. The flue gas inlet (11) and the flue gas outlet (12) are both connected to the flue gas passage. The exhaust pipe (1) has a first wall (13) and a second wall (14) arranged at intervals. The first wall (13) and / or the second wall (14) are recessed towards the flue gas passage to form a receiving groove (2). A phase change heat absorption structure is installed in the receiving tank (2) to cool the high-temperature flue gas flowing through the discharge pipe (1).

2. The battery pack smoke venting device of claim 1, wherein, The first wall (13) includes a first wall segment (131), a first groove sidewall (132) and a first groove bottom wall (133). The first wall segment (131) is provided with a plurality of intervals. The first groove sidewall (132) is provided at a predetermined angle to the two sides of two adjacent first wall segments (131). The first groove sidewall (132) extends toward the second wall (14). The two first groove sidewalls (132) located between two adjacent first wall segments (131) are provided with relative intervals. The first groove bottom wall (133) connects the two first groove sidewalls (132) near the end of the second wall (14). The two first groove sidewalls (132) and the first groove bottom wall (133) enclose to form the receiving groove (2).

3. The battery pack smoke venting device of claim 2, wherein, The first bottom wall (133) and the second wall (14) are spaced apart.

4. The battery pack smoke venting device of claim 2, wherein, The second wall (14) includes a second wall segment (141), a second groove sidewall (142), and a second groove bottom wall (143). The second wall segment (141) is provided at intervals. The two sides of two adjacent second wall segments (141) are connected at a predetermined angle to each other and the second groove sidewall (142) is provided. The second groove sidewall (142) extends toward the first wall (13). The two second groove sidewalls (142) located between two adjacent second wall segments (141) are provided at intervals. The second groove bottom wall (143) connects the two second groove sidewalls (142) near the end of the first wall (13). The two second groove sidewalls (142) and the second groove bottom wall (143) enclose the receiving groove (2).

5. The battery pack flue gas emission device according to claim 4, characterized in that, The second bottom wall (143) is spaced apart from the first wall (13).

6. The battery pack smoke venting device of claim 4, wherein, The first groove sidewall (132) and the second groove sidewall (142) are arranged at intervals relative to each other.

7. The battery pack smoke venting device of claim 4, wherein, Each of the first wall sections (131) is provided with the flue gas outlet (12); and / or, The battery pack exhaust device (10) further includes a protective structure (3), which is disposed on the outside of the exhaust pipe (1) and covers the second wall (14).

8. The battery pack smoke venting device of any one of claims 1-7, wherein, The battery pack flue gas emission device (10) also includes a sealing structure (4), which is disposed in the receiving groove (2) and close to the flue gas inlet (11).

9. A battery pack, characterized by, include: The container (20) has an outlet (201); The battery pack flue gas emission device (10) according to any one of claims 1 to 8 is disposed inside the housing (20), the flue gas inlet (11) is connected to the interior of the housing (20), and the flue gas outlet (12) is connected to the emission port (201).

10. The battery pack of claim 9, wherein, The inner wall of the box (20) with the discharge port (201) is provided with a heat insulation layer (30).

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