Battery pack flue gas discharge device and battery pack

Abstract

The utility model relates to battery package technical field discloses battery package flue gas emission device and battery package, include: inner pipeline has interval setting flue gas entrance and flue gas exit, outer pipeline is located the outside of inner pipeline and is interval setting with inner pipeline, the pipe wall of outer pipeline is provided with exhaust port, the exhaust port is communicated with flue gas exit and sets up, phase change heat absorption structure sets up between inner pipeline and outer pipeline is used for cooling the high temperature flue gas that flows through the inside of inner pipeline. The utility model high temperature flue gas in battery package box body enters by flue gas entrance, and the high temperature flue gas that flows through the inside of inner pipeline is cooled by phase change heat absorption structure between inner pipeline and outer pipeline via inner pipeline by flue gas exit and exports, thereby make the flue gas temperature that flue gas emission device exports reduce to safe temperature, avoid the high temperature of flue gas and cause the fire combustion of other structures in the outside of battery package.

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] With the rapid development of power batteries, battery pack safety has become a critical issue. During use, battery packs may experience thermal runaway due to various reasons, such as overcharging, over-discharging, short circuits, and high temperatures. When a battery pack experiences thermal runaway, it releases a large amount of heat and smoke.

[0003] Currently, research on battery pack thermal runaway mainly focuses on the battery's thermal management and safety protection structures. The fumes generated during thermal runaway are typically treated by venting them to the external environment through pipes. However, if the vented fumes are too hot and come into direct contact with the air, they can ignite. Utility Model Content

[0004] 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.

[0005] In a first aspect, this utility model provides a battery pack flue gas emission device, comprising: an inner pipe having a flue gas inlet and a flue gas outlet spaced apart; an outer pipe sleeved outside the inner pipe and spaced apart from the inner pipe, the outer pipe having an exhaust port on its wall, the exhaust port being connected to the flue gas outlet; and a phase change heat absorption structure disposed between the inner pipe and the outer pipe for cooling the high-temperature flue gas flowing through the inner pipe.

[0006] 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 inner pipe. Furthermore, the phase change heat absorption structure located between the inner and outer pipes cools the high-temperature flue gas flowing through the inner pipe, thereby reducing the temperature of the flue gas discharged from 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.

[0007] In one optional embodiment, the battery pack flue gas emission device further includes a sealing structure, which is connected between the inner pipe and the outer pipe and surrounds the inner pipe. The sealing structure is spaced apart from the flue gas outlet, and the phase change heat absorption structure is at least disposed between the sealing structure and the flue gas outlet.

[0008] Beneficial effects: By setting up a sealing structure, high-temperature flue gas is prevented from entering the space between the inner and outer pipes, thereby preventing the high-temperature flue gas from directly contacting the phase change heat absorption structure and causing a chemical reaction. Furthermore, the phase change heat absorption structure absorbs heat and decomposes under the action of high-temperature flue gas to produce a certain amount of gas, which can be discharged simultaneously at the exhaust port.

[0009] In one alternative embodiment, the end of the inner pipe forms the flue gas inlet, and the pipe wall of the inner pipe forms the flue gas outlet.

[0010] Beneficial effects: It facilitates the installation of flue gas inlets and outlets on the internal ducts and makes it easy to cooperate with the battery pack housing to achieve flue gas discharge.

[0011] In one alternative embodiment, the sealing structure is connected to the pipe wall of the inner duct near the flue gas inlet.

[0012] Beneficial effects: It allows for a longer path between the sealing structure and the flue gas outlet, increases the space for the phase change heat absorption structure, and improves the cooling effect on high-temperature flue gas.

[0013] In one optional embodiment, there are several inner pipes arranged in a cross pattern, and the flue gas outlet is located at the intersection of the inner pipes; there are several outer pipes arranged in a cross pattern, and each outer pipe corresponds to one of the inner pipes, with the exhaust port located at the intersection of the outer pipes.

[0014] Beneficial effects: By setting multiple internal and external pipes, the emission paths of the flue gas emission device are increased, which enables the gas inside the battery pack to be discharged in a timely and effective manner, avoiding excessive internal pressure and reducing the safety risks such as battery pack explosion.

[0015] In one alternative embodiment, the interior of the inner pipe is provided with a fire extinguishing agent.

[0016] Beneficial effects: By setting fire extinguishing agents, high-temperature flue gas can be cooled down quickly and extinguished instantly, inhibiting the combustion of high-temperature flue gas in the inner pipe and further preventing the fire from starting in other structures outside the battery pack.

[0017] In one alternative embodiment, the extinguishing agent is covered with a temperature-sensitive layer.

[0018] Beneficial effects: When the temperature of the flue gas in the inner pipe does not reach the decomposition temperature of the temperature-sensitive layer, the temperature-sensitive layer remains in a stable and sealed state, thus keeping the extinguishing agent in a closed space and ensuring the stability of the extinguishing agent; when the temperature of the flue gas in the inner pipe reaches the decomposition temperature of the temperature-sensitive layer, the temperature-sensitive layer gradually decomposes and breaks down, allowing the extinguishing agent to take effect.

[0019] 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 and the exhaust port are both connected to the exhaust port.

[0020] Beneficial effects: The battery pack exhaust device cools down the high-temperature fumes inside the battery pack before venting them out, preventing them from igniting other structures outside the battery pack, avoiding secondary injuries, and improving the overall safety of the battery pack.

[0021] In one alternative embodiment, the discharge port is covered with a waterproof and breathable membrane.

[0022] Beneficial effects: The waterproof and breathable membrane allows gas inside the battery pack to be discharged through it. When the gas pressure inside the internal pipe is too high, the gas can push the waterproof and breathable membrane open, enabling rapid discharge of smoke from the battery pack and preventing safety accidents such as battery pack explosions, thus improving the safety performance of the battery pack.

[0023] In one optional embodiment, the enclosure includes a main body and a top cover connected together, the exhaust port is opened on the top cover, the battery pack exhaust device is disposed inside the top cover, and a heat insulation layer is provided on the side of the top cover facing the battery pack exhaust device.

[0024] Beneficial effects: By setting up a heat insulation layer to protect the inner wall of the top cover, the structure of the top cover is prevented from being damaged or even burned through when high-temperature flue gas is directly sprayed onto 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 1 This is a schematic diagram of the structure of a battery pack flue gas emission device according to an embodiment of the present utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of the battery pack exhaust device from another angle;

[0028] Figure 3 for Figure 1 Top view of the battery pack exhaust device;

[0029] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0030] Figure 5 for Figure 1 The diagram shows the connection structure between the battery pack exhaust device and the top cover.

[0031] Figure 6 This is a schematic diagram of the battery pack structure according to an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Internal pipe; 11. Flue gas inlet; 12. Flue gas outlet; 2. External pipe; 21. Exhaust port; 3. Sealing structure; 4. Accommodation space; 10. Flue gas emission device; 20. Box body; 201. Box body; 202. Top cover; 30. Waterproof and breathable membrane; 40. Insulation layer. Detailed Implementation

[0034] 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.

[0035] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0036] According to an embodiment of the present invention, a battery pack flue gas emission device 10 is provided, comprising: an inner pipe 1 having a flue gas inlet 11 and a flue gas outlet 12 spaced apart; an outer pipe 2 sleeved outside the inner pipe 1 and spaced apart from the inner pipe 1, the outer pipe 2 having an exhaust port 21 on its wall, the exhaust port 21 being connected to the flue gas outlet 12; and a phase change heat absorption structure disposed between the inner pipe 1 and the outer pipe 2 for cooling the high-temperature flue gas flowing through the inner pipe 1.

[0037] 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 inner pipe 1. Furthermore, the phase change heat absorption structure located between the inner pipe 1 and the outer pipe 2 is used to cool the high-temperature flue gas flowing through the inner 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.

[0038] Specifically, the inner pipe 1 encloses and forms an exhaust channel, with both the flue gas inlet 11 and the flue gas outlet 12 connected to the exhaust channel. The outer pipe 2 is fitted around the inner pipe 1 and spaced apart from it, thus forming a receiving space 4 between the inner wall of the outer pipe 2 and the outer wall of the inner pipe 1. This receiving space 4 is used to house the phase change heat absorption structure. That is, the gas inside the battery pack housing 20 enters the inner pipe 1 through the flue gas inlet 11, flows through the inner pipe 1, is cooled by the phase change heat absorption structure, and is then discharged through the flue gas outlet 12. Simultaneously, the gas generated by the heat absorption and decomposition of the phase change heat absorption structure is discharged through the exhaust port 21.

[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 exhaust 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 of housing 20 fails, it may cause high-temperature jets or even flames to be directly discharged from housing 20, causing secondary damage.

[0043] In this embodiment, the inner pipe 1 is used to plan the exhaust path for the battery modules in the battery pack, and a phase change material is installed between the inner pipe 1 and the outer pipe 2 to absorb heat and cool down the high-temperature flue gas in the inner pipe 1. While ensuring the smooth discharge of flue gas, the temperature of the flue gas at the exhaust port is reduced to prevent the fire and combustion of other structures outside the battery pack and to avoid secondary damage.

[0044] In one embodiment, such as Figure 1 , Figure 2 and Figure 4As shown, the battery pack flue gas emission device 10 also includes a sealing structure 3. The sealing structure 3 is connected and disposed between the inner pipe 1 and the outer pipe 2, and is arranged around the inner pipe 1. The sealing structure 3 is spaced apart from the flue gas outlet 12. The phase change heat absorption structure is disposed at least between the sealing structure 3 and the flue gas outlet 12. By setting the sealing structure 3, high-temperature flue gas is prevented from entering the space between the inner pipe 1 and the outer pipe 2, thereby preventing the high-temperature flue gas from directly contacting the phase change heat absorption structure and causing a chemical reaction. Furthermore, the phase change heat absorption structure absorbs heat and decomposes under the action of high-temperature flue gas to produce a certain amount of gas, and the gas can be discharged simultaneously at the exhaust port 21.

[0045] It is worth noting that by setting a sealing structure 3 between the inner pipe 1 and the outer pipe 2, the accommodating space 4 between the inner pipe 1 and the outer pipe 2 can be sealed off, and the phase change heat absorption structure is set in the accommodating space 4 corresponding to the sealing structure 3 and the flue gas outlet 12. Thus, under the blocking effect of the sealing structure 3, the high-temperature flue gas in the battery pack box 20 will not come into direct contact with the phase change heat absorption structure. Instead, the phase change heat absorption structure and the high-temperature flue gas exist in two separate spaces. The heat exchange between the two spaces is achieved by using the pipe wall of the inner pipe 1 to cool down the high-temperature flue gas.

[0046] Optionally, the sealing structure 3 is integrally formed with the inner pipe 1 or the outer pipe 2, or the sealing structure 3 is connected between the inner pipe 1 and the outer pipe 2 by welding, bonding, interference fit, or other methods. It is understood that the sealing structure 3 has a certain degree of high-temperature resistance, thus maintaining the stability of the overall structure under the impact of high-temperature flue gas.

[0047] Furthermore, in one embodiment, such as Figures 1 to 4 As shown, a flue gas inlet 11 is formed at the end of the inner pipe 1, and a flue gas outlet 12 is formed by openings in the pipe wall of the inner pipe 1. This arrangement facilitates the installation of the flue gas inlet 11 and the flue gas outlet 12 on the inner pipe 1, and also facilitates the cooperation with the battery pack housing 20 to achieve flue gas discharge.

[0048] It is worth noting that both ends of the inner pipe 1 can form flue gas inlets 11, and flue gas outlets 12 can be opened at the middle position of the length of the inner pipe 1. Therefore, both ends of the inner pipe 1 can be used for high-temperature flue gas to enter, and the high-temperature flue gas can be discharged after flowing through approximately equal paths, thereby improving the exhaust rate and the uniformity of gas flow inside the inner pipe 1.

[0049] Of course, in other alternative embodiments, the positions of the flue gas inlet 11 and the flue gas outlet 12 can be specifically set according to the exhaust requirements of the battery pack and the overall structure of the battery pack housing 20.

[0050] Specifically, in one embodiment, such as Figure 1 ,Figure 2 and Figure 4 As shown, the sealing structure 3 is connected to the inner pipe 1 near the flue gas inlet 11. This arrangement allows for a longer path between the sealing structure 3 and the flue gas outlet 12, increasing the space available for the phase change heat absorption structure and improving the cooling effect on the high-temperature flue gas.

[0051] That is, the sealing structure 3 is located at the end of the inner pipe 1, which is also the end of the outer pipe 2. Therefore, the distance between the sealing structure 3 and the flue gas outlet 12 can be extended. Within the accommodating space 4 between the inner pipe 1 and the outer pipe 2, all space except the space occupied by the sealing structure 3 can be used to install the phase change material, increasing the available space for the phase change material. This facilitates the design of the amount of phase change material to be installed based on the exhaust volume of the battery modules within the battery pack.

[0052] In one embodiment, such as Figures 1 to 3 As shown, several inner pipes 1 are arranged in a cross configuration, with the flue gas outlet 12 located at the intersection of these inner pipes 1. Several outer pipes 2 are also arranged in a cross configuration, with each outer pipe 2 corresponding to one of the inner pipes 1. The exhaust port 21 is located at the intersection of these outer pipes 2. By using multiple inner pipes 1 and outer pipes 2, the emission paths of the flue gas emission device 10 are increased, allowing for timely and effective discharge of gas from the battery pack. This prevents excessive internal pressure in the battery pack and reduces the risk of battery pack explosions and other safety hazards.

[0053] It is worth noting that several inner pipes 1 are configured, with each inner pipe 1 having both ends serving as flue gas inlets 11 and the interior of each inner pipe 1 serving as an exhaust channel. Furthermore, these inner pipes 1 are arranged in a crisscross pattern, with the flue gas outlet 12 located at the intersection of the inner pipes 1. Therefore, only one flue gas outlet 12 is needed for each inner pipe 1, facilitating the placement of the flue gas outlet 12 and its coordination with the exhaust port of the housing 20. Similarly, several outer pipes 2 are configured, with each outer pipe 2 corresponding to one inner pipe 1. Each inner pipe 1 and its corresponding outer pipe 2 form a phase change heat absorption structure containing space 4, thereby cooling the high-temperature flue gas flowing through each inner pipe 1. The outer pipes 2 are also arranged in a crisscross pattern, with the exhaust port 21 located at the intersection of the outer pipes 2. Therefore, only one exhaust port 21 is needed for each outer pipe 2, facilitating the coordination of the exhaust port 21 with the flue gas outlet 12 and the same exhaust port.

[0054] In addition, the several intersecting internal pipes 1 can form multiple flue gas inlets 11 around the intersection in the circumferential direction. After the battery pack flue gas emission device 10 of this embodiment is assembled into the battery pack housing 20, the multiple flue gas inlets 11 can be distributed in different positions in the housing 20, so that the high-temperature flue gas in all places in the housing 20 can be discharged quickly, ensuring the safety performance of the battery pack.

[0055] Optionally, both inner pipe 1 and outer pipe 2 are square pipes with a wall thickness of 0.6mm to 1mm and the material of the square pipes is SPCC (cold-rolled carbon steel sheet).

[0056] Specifically, the extinguishing agent is perfluorohexanone, which has the characteristics of insulation, no damage to batteries, and environmental friendliness.

[0057] It is worth noting that when the temperature of the environment in which the temperature-sensing layer is located is lower than the decomposition temperature of the temperature-sensing layer (e.g., 70°C), the temperature-sensing layer is in an intact state; when the temperature of the environment in which the temperature-sensing layer is located reaches the decomposition temperature of the temperature-sensing layer, the temperature-sensing layer gradually decomposes and breaks down.

[0058] Optionally, in this embodiment, the temperature-sensitive layer can be a PET heat-sealable film.

[0059] In one embodiment, a fire extinguishing agent is installed inside the inner pipe 1. By installing the fire extinguishing agent, the high-temperature flue gas can be rapidly cooled and extinguished instantly, suppressing the combustion of the high-temperature flue gas inside the inner pipe 1, and further preventing the ignition and combustion of other structures outside the battery pack.

[0060] Furthermore, in one embodiment, the extinguishing agent is covered with a temperature-sensitive layer. This configuration ensures that when the flue gas temperature inside the inner pipe 1 does not reach the decomposition temperature of the temperature-sensitive layer, the layer remains stable and sealed, thus keeping the extinguishing agent in a confined space and guaranteeing its stability. When the flue gas temperature inside the inner pipe 1 reaches the decomposition temperature of the temperature-sensitive layer, the layer gradually decomposes and breaks down, allowing the extinguishing agent to function.

[0061] According to an embodiment of the present invention, another aspect provides a battery pack, including: a housing 20 with an exhaust port; 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 and an exhaust port 21 both communicating with the exhaust port.

[0062] The battery pack of this embodiment uses the battery pack exhaust device 10 to cool down and discharge the high-temperature flue gas inside the battery pack housing 20, thereby preventing the fire from igniting other structures outside the battery pack, avoiding secondary damage incidents, and improving the overall safety of the battery pack.

[0063] In one embodiment, such as Figure 6As shown, the discharge port is covered with a waterproof and breathable membrane 30. The waterproof and breathable membrane 30 allows gas inside the battery pack housing 20 to be discharged through it. Furthermore, when the gas pressure inside the inner pipe 1 becomes too high, the gas can push open the waterproof and breathable membrane 30, enabling rapid discharge of smoke from the battery pack housing 20. This prevents safety accidents such as battery pack explosions and improves the safety performance of the battery pack.

[0064] Specifically, the waterproof and breathable membrane 30 is an PETFE (polytetrafluoroethylene) membrane. The waterproof and breathable membrane 30 is connected to the upper cover 202 and covers the discharge port by ultrasonic welding.

[0065] In one embodiment, such as Figure 5 and Figure 6 As shown, the housing 20 includes a main body 201 and a top cover 202 connected together. An exhaust port is located on the top cover 202, and a battery pack exhaust device 10 is disposed inside the top cover 202. A heat insulation layer 40 is provided on the side of the top cover 202 facing the battery pack exhaust device 10. The heat insulation layer 40 protects the inner wall of the top cover 202, preventing damage or even burn-through to the structure of the top cover 202 when high-temperature exhaust gases are directly injected into it.

[0066] It is worth noting that the outer wall of the outer pipe 2 is fitted with the insulation layer 40. Specifically, the insulation layer 40 is a mica board.

[0067] Optionally, other surfaces of the outer pipe 2 exposed to the space of the upper cover 202 may also be covered with a heat insulation layer 40, thereby improving the structural strength of the outer pipe 2, reducing temperature conduction, improving the overall heat insulation effect of the battery pack, and preventing high-temperature flue gas from damaging the structure of the outer pipe 2 when it is directly injected into it.

[0068] Furthermore, the orthographic projection of the battery pack flue gas emission device 10 on the top surface of the cover 202 can occupy a large area of ​​the top surface of the cover 202, 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 inner pipe 1, thereby maximizing the heat absorption time and effectively reducing the temperature of the high-temperature flue gas flowing through the inner pipe 1.

[0069] 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 202. As the battery ejection time increases, the air pressure and temperature in the space of the upper cover 202 gradually increase. The high-temperature and high-pressure gas has nowhere to be released and can only enter the inner pipe 1 through the flue gas inlet 11. When the high-temperature flue gas enters the inner pipe 1, the temperature-sensing layer is decomposed by heat, exposing the fire extinguishing agent to the high-temperature flue gas. The fire extinguishing agent takes effect, and the phase change heat-absorbing structure between the inner pipe 1 and the outer pipe 2 absorbs heat and decomposes, thereby rapidly cooling the high-temperature flue gas, extinguishing the fire instantly, and continuously suppressing reignition. As the air pressure inside the inner pipe 1 increases, the gas can push open the waterproof and breathable membrane 30. The high-temperature flue gas flows through the entire inner pipe 1, and after being extinguished and cooled, the flue gas below the combustible temperature is discharged from the exhaust port. The gas generated by the heat-absorbing decomposition of the phase change heat-absorbing structure is also discharged from the exhaust port.

[0070] 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 flue gas emission device, characterized in that, include: The internal duct (1) has a flue gas inlet (11) and a flue gas outlet (12) spaced apart; An outer pipe (2) is sleeved outside the inner pipe (1) and spaced apart from the inner pipe (1). The outer pipe (2) has an exhaust port (21) on its wall, and the exhaust port (21) is connected to the flue gas outlet (12). A phase change heat absorption structure is disposed between the inner pipe (1) and the outer pipe (2) to cool down the high-temperature flue gas flowing through the inner pipe (1).

2. The battery pack flue gas emission device according to claim 1, characterized in that, The battery pack flue gas emission device (10) further includes a sealing structure (3), which is connected between the inner pipe (1) and the outer pipe (2) and surrounds the inner pipe (1). The sealing structure (3) is spaced apart from the flue gas outlet (12), and the phase change heat absorption structure is at least located between the sealing structure (3) and the flue gas outlet (12).

3. The battery pack flue gas emission device according to claim 2, characterized in that, The end of the inner pipe (1) forms the flue gas inlet (11), and the pipe wall of the inner pipe (1) forms the flue gas outlet (12).

4. The battery pack flue gas emission device according to claim 3, characterized in that, The sealing structure (3) is connected to the inner pipe (1) near the pipe wall of the flue gas inlet (11).

5. The battery pack flue gas emission device according to any one of claims 1 to 4, characterized in that, The inner pipe (1) is provided in several ways, and the several inner pipes (1) are arranged in a cross manner. The flue gas outlet (12) is opened at the intersection of the several inner pipes (1). The outer pipe (2) is provided in several ways, and the several outer pipes (2) are arranged in a cross manner. The several outer pipes (2) are arranged one-to-one with the several inner pipes (1). The exhaust port (21) is opened at the intersection of the several outer pipes (2).

6. The battery pack flue gas emission device according to any one of claims 1 to 4, characterized in that, The inner pipe (1) is equipped with a fire extinguishing agent.

7. The battery pack flue gas emission device according to claim 6, characterized in that, The extinguishing agent is covered with a temperature-sensitive layer.

8. A battery pack, characterized in that, include: The container (20) is equipped with a discharge port; The battery pack flue gas emission device (10) according to any one of claims 1 to 7 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) and the exhaust port (21) are both connected to the exhaust port.

9. The battery pack according to claim 8, characterized in that, The discharge port is covered with a waterproof and breathable membrane (30).

10. The battery pack according to claim 8, characterized in that, The enclosure (20) includes a main body (201) and a top cover (202) connected together. The exhaust port is opened on the top cover (202). The battery pack exhaust device (10) is disposed inside the top cover (202). A heat insulation layer (40) is provided on the side of the top cover (202) facing the battery pack exhaust device (10).

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