Battery pack exhaust device and battery pack

Abstract

The utility model relates to power battery technical field discloses battery pack exhaust device and battery pack, include: exhaust duct, have import and export, import and the inside space of box intercommunication, export and the vent on the box intercommunication, form several exhaust space sections in exhaust duct, several exhaust space sections are parallel and along the extension direction of exhaust duct and side by side arrangement, or, several exhaust space sections along the extension direction of exhaust duct head -tail intercommunication and adjacent exhaust space sections present predetermined angle intercommunication setting, phase change heat absorption layer, set up on the inner wall of exhaust duct, the utility model discloses utilize phase change heat absorption layer to carry out the cooling to the high temperature flue gas that flows through the inside of exhaust duct, and through several exhaust space sections extension exhaust duct inside flue gas's flow path, increase heat absorption time to exhaust duct's flue gas temperature reduction to safe temperature, avoid the ignition combustion of other structures in the battery pack outside.

Description

Technical Field

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

[0002] During the use of lithium-ion batteries, thermal runaway of a single battery can spread to surrounding batteries, causing a chain reaction. The smoke, fire, and explosion generated during thermal runaway directly threaten the safety of drivers and users. Therefore, the design of the battery pack enclosure needs to consider the venting of gases from the battery pack through exhaust channels in the event of thermal runaway. With the promulgation of relevant national standards such as the "Safety Technical Specifications for Lithium-ion Batteries for Electric Bicycles," how to reduce the hazards caused by thermal runaway of lithium-ion batteries has become an urgent problem to be solved in the industry.

[0003] In the existing technology, although an exhaust channel is designed inside the battery pack, the temperature of the smoke emitted from the battery pack is not controlled. If the temperature of the emitted smoke is too high or even contains flames, it can easily cause accidents such as fires in structures located outside the battery pack. Utility Model Content

[0004] In view of this, the present invention provides a battery pack exhaust device and a battery pack to solve the problem that the exhaust gas emitted by the battery pack in the prior art is too hot or even contains flames, which can easily cause accidents such as fires and combustion of structures located on the outside of the battery pack.

[0005] In a first aspect, this utility model provides a battery pack exhaust device located inside a battery pack housing, comprising: an exhaust pipe having an inlet and an outlet, the inlet communicating with the internal space of the housing, the outlet communicating with a discharge port on the housing, and a plurality of exhaust space segments formed within the exhaust pipe; the plurality of exhaust space segments being parallel and arranged side-by-side along a direction perpendicular to the extension of the exhaust pipe, or the plurality of exhaust space segments being connected end-to-end along the extension of the exhaust pipe and adjacent exhaust space segments being connected at a predetermined angle; and a phase change heat absorption layer disposed on the inner wall of the exhaust pipe.

[0006] Beneficial effects: The high-temperature flue gas inside the battery pack enters through the inlet and exits through several exhaust space sections. Furthermore, the phase change heat absorption layer is used to cool the high-temperature flue gas flowing through the exhaust pipe. The several exhaust space sections extend the flow path of the flue gas in the exhaust pipe, increasing the heat absorption time. This reduces the temperature of the flue gas discharged from the exhaust pipe to a safe temperature, preventing the fire from igniting other structures outside the battery pack.

[0007] In one optional embodiment, the exhaust pipe includes a pipe body and a baffle plate. The baffle plate is disposed inside the pipe body and has at least one baffle plate to divide the internal space of the pipe body into at least two parallel exhaust space segments. The baffle plate has a communication opening to connect two adjacent exhaust space segments. The inlet and the outlet are respectively located on the pipe body. The inner wall of the pipe body and / or the surface of the baffle plate are provided with the phase change heat absorption layer.

[0008] Beneficial effects: The partitions divide the interior of the main pipe into several exhaust space sections, extending the flow path of high-temperature flue gas and increasing the usable area of ​​the phase change heat absorption layer, effectively reducing the temperature of the high-temperature flue gas flowing through the exhaust pipe.

[0009] In one alternative embodiment, a flame-retardant block is provided between the pipe body and the partition and / or between adjacent partitions.

[0010] Beneficial effects: It facilitates the fixing of the partition inside the pipe body and prevents the flame in the exhaust space section from spreading to other exhaust space sections.

[0011] In one optional embodiment, the exhaust pipe includes several pipe segments, which are connected end to end along the extension direction of the exhaust pipe. Adjacent pipe segments are connected at a predetermined angle, and each pipe segment forms the exhaust space segment. At least a portion of the pipe segments have the phase change heat absorption layer on their inner walls.

[0012] Beneficial effects: By using several pipe sections with bends, the flow path of high-temperature flue gas is extended, and the flow time of high-temperature gas in the exhaust pipe is increased as much as possible, thereby maximizing the heat absorption time and effectively reducing the temperature of the high-temperature flue gas flowing through the exhaust pipe.

[0013] In one alternative embodiment, the phase change heat-absorbing layer is covered with a temperature-sensitive layer.

[0014] Beneficial effects: When the flue gas temperature in the exhaust pipe does not reach the decomposition temperature of the temperature-sensing layer, the temperature-sensing layer remains in a stable and sealed state, thus keeping the phase change heat absorption layer in a closed space and ensuring the stability of the phase change heat absorption layer; when the flue gas temperature in the exhaust pipe reaches the decomposition temperature of the temperature-sensing layer, the temperature-sensing layer gradually decomposes, allowing the phase change heat absorption layer to directly contact the high-temperature flue gas in the exhaust pipe, thereby achieving heat absorption and cooling of the high-temperature flue gas.

[0015] In one alternative embodiment, the interior of the exhaust duct is provided with a fire extinguishing agent, and the exterior of the fire extinguishing agent is covered with a heat-sensitive layer.

[0016] Beneficial effects: When the temperature of the flue gas in the exhaust 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 exhaust 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, quickly cool down and extinguish the fire instantly, and inhibit the combustion of high-temperature flue gas in the exhaust pipe.

[0017] In one alternative embodiment, at least a portion of the outer wall of the exhaust duct is covered with a heat insulation layer.

[0018] Beneficial effects: By utilizing the heat insulation layer, the structural strength of the exhaust pipe is improved while reducing temperature conduction, thus enhancing the overall heat insulation effect of the battery pack. At the same time, it prevents the structure of the exhaust pipe from being damaged when high-temperature flue gas is directly injected into it.

[0019] Secondly, this utility model also provides a battery pack, including: a housing with an outlet; and the aforementioned battery pack exhaust device, which is disposed in the housing and the outlet is connected to the outlet.

[0020] Beneficial effects: The battery pack exhaust device cools and discharges the high-temperature fumes inside the battery pack, 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 cross-sectional area of ​​the exhaust pipe opening perpendicular to the extension direction is not less than the opening area of ​​the discharge port.

[0022] Beneficial effects: Reduces the resistance encountered during flue gas discharge, ensuring that flue gas in the exhaust pipe is smoothly discharged from the outlet.

[0023] In one alternative embodiment, the discharge port is covered with a waterproof and breathable membrane.

[0024] Beneficial effects: The waterproof and breathable membrane allows gas inside the battery pack to be discharged through it. When the gas pressure in the exhaust pipe is too high, the gas can push the waterproof and breathable membrane open, enabling the rapid discharge of smoke from inside the battery pack. This prevents safety accidents such as battery pack explosions and improves the safety performance of the battery pack. 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 an exhaust pipe according to an embodiment of the present utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of the exhaust pipe from another angle is shown.

[0028] Figure 3 for Figure 1 A side view of the exhaust pipe shown;

[0029] Figure 4 for Figure 1 A perspective view of the exhaust pipe shown;

[0030] Figure 5 This is a schematic diagram of the structure of another exhaust pipe according to an embodiment of the present utility model;

[0031] Figure 6 for Figure 5 A schematic diagram of the exhaust pipe from another angle is shown.

[0032] Figure 7 This is a structural schematic diagram of the box (top cover) according to an embodiment of the present utility model.

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

[0034] 1. Exhaust pipe; 11. Inlet; 12. Outlet; 13. Exhaust space section; 14. Pipe body; 15. Baffle; 151. Connecting port; 16. Flame retardant block; 17. Pipe section; 2. Box; 21. Discharge port; 3. Phase change heat absorption layer; 4. Temperature sensing layer; 5. Extinguishing agent; 6. Heat 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 exhaust device is provided, located inside a battery pack housing 2, comprising: an exhaust pipe 1 having an inlet 11 and an outlet 12, the inlet 11 communicating with the internal space of the housing 2, the outlet 12 communicating with a discharge port 21 on the housing 2, and a plurality of exhaust space segments 13 formed inside the exhaust pipe 1; the plurality of exhaust space segments 13 are arranged parallel to each other and side by side along the extension direction perpendicular to the exhaust pipe 1, or the plurality of exhaust space segments 13 are connected end to end along the extension direction of the exhaust pipe 1 and adjacent exhaust space segments 13 are connected at a predetermined angle; and a phase change heat absorption layer 3 is disposed on the inner wall of the exhaust pipe 1.

[0038] Using the battery pack exhaust device of this embodiment, the high-temperature flue gas inside the battery pack housing 2 enters through the inlet 11, exits through the outlet 12 via several exhaust space sections 13, and cools the high-temperature flue gas flowing through the exhaust pipe 1 by using the phase change heat absorption layer 3. Furthermore, the flow path of the flue gas inside the exhaust pipe 1 is extended by the several exhaust space sections 13, increasing the heat absorption time, thereby reducing the temperature of the flue gas discharged from the exhaust pipe 1 to a safe temperature and preventing the ignition and combustion of other structures outside the battery pack.

[0039] It is worth noting that the phase change heat absorption layer 3 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 design the flow path of the smoke, and the flow path of the smoke is relatively short. Furthermore, the relevant technologies do not have a cooling design for the high-temperature smoke inside the battery pack housing 2. Therefore, when a battery near the exhaust port 21 of housing 2 fails, it may cause high-temperature jets or even flames to be directly discharged from housing 2, causing secondary damage.

[0043] In this embodiment, exhaust pipe 1 is used to plan an exhaust path for the battery modules in the battery pack, and phase change material is added to the exhaust pipe 1 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 discharge port 21 is reduced to prevent the fire and combustion of other structures outside the battery pack and to avoid secondary damage.

[0044] The following two examples illustrate two specific implementation methods of the exhaust pipe 1.

[0045] In the first embodiment of exhaust pipe 1, such as Figures 1 to 4 As shown, the exhaust pipe 1 includes a pipe body 14 and a partition 15. The partition 15 is disposed inside the pipe body 14. The partition 15 is provided with at least one partition to divide the internal space of the pipe body 14 into at least two parallel exhaust space sections 13. A connecting port 151 is provided on the partition 15 to connect two adjacent exhaust space sections 13. The inlet 11 and the outlet 12 are respectively located on the pipe body 14.

[0046] Furthermore, a phase change heat absorption layer 3 is provided on the inner wall of the pipe body 14 and / or the surface of the partition 15. Preferably, the phase change heat absorption layer 3 is provided on both the inner wall of the pipe body 14 and the surface of the partition 15. Specifically, the phase change heat absorption layer 3 is bonded to the side of the pipe body 14 facing the exhaust space section 13 and the surface of the partition 15 facing the exhaust space section 13.

[0047] It is worth noting that in this embodiment, the partition 15 is used to divide the interior of the main body of the pipe 14 into several exhaust space sections 13, which extends the flow path of the high-temperature flue gas and increases the usable area of ​​the phase change heat absorption layer 3, effectively reducing the temperature of the high-temperature flue gas flowing through the exhaust pipe 1.

[0048] In this embodiment, as Figure 1 and Figure 2 As shown, in the extending direction of the pipe body 14, the first end of the pipe body 14 is closed, and the second end of the pipe body 14 is open to form the first inlet 11 of the exhaust pipe 1. Further, a second inlet 11 is formed on the pipe wall of the pipe body 14 near the second end, and an outlet 12 is formed on the pipe wall of the pipe body 14 near the first end. The second inlet 11 and the outlet 12 are respectively located on two opposite pipe walls of the pipe body 14. Of course, as an alternative implementation, the positions of the inlet 11 and the outlet 12 can be designed according to their specific cooperation with the internal space of the housing 2 and the exhaust port 21 on the housing 2. For example, the second inlet 11 and the outlet 12 can be respectively located on the same side wall of the pipe body 14.

[0049] Specifically, in this embodiment, the main body of the pipe 14 is a square tube with a wall thickness of 0.6mm to 1mm and the material of the square tube is SPCC (cold-rolled carbon steel sheet).

[0050] Specifically, in this embodiment, the thickness of the partition 15 is 0.6 mm to 1 mm, and the material of the partition 15 is SPCC (cold-rolled carbon steel sheet).

[0051] In this embodiment, the partition 15 is provided with a communication port 151 at both ends near the two ends along the extension direction. That is, the partition 15 is provided with a communication port 151 at both ends along the extension direction of the pipe body 14. In other words, the partition 15 is provided with a communication port 151 at the first end and the second end near the pipe body 14.

[0052] In this embodiment, as Figures 1 to 4 As shown, flame-retardant blocks 16 are provided between the pipe body 14 and the partition 15 and / or between adjacent partitions 15. This arrangement facilitates the fixing of the partition 15 inside the pipe body 14 and prevents the flame in the exhaust space section 13 from spreading to other exhaust space sections 13.

[0053] It is worth noting that, please refer to Figure 4 At each fixed position of the partition 15 (e.g., the four corners of the partition 15), the partition 15 is sandwiched between two flame-retardant blocks 16. The partition 15 and the two flame-retardant blocks 16 are interference-fitted to ensure the stability of the partition 15 installation. Furthermore, the height of each exhaust space section 13 can be adjusted according to the gas production rate curve, and the height of the flame-retardant blocks 16 can be adjusted synchronously.

[0054] In the second embodiment of exhaust pipe 1, such as Figure 5 and Figure 6 As shown, the exhaust pipe 1 includes several pipe segments 17, which are connected end to end along the extension direction of the exhaust pipe 1. Adjacent pipe segments 17 are connected at a predetermined angle, and an exhaust space segment 13 is formed within each pipe segment 17.

[0055] Furthermore, at least a portion of the inner wall of the pipe section 17 is provided with a phase change heat absorption layer 3. Preferably, the phase change heat absorption layer 3 is bonded to the inner wall of all pipe sections 17. Specifically, the phase change heat absorption layer 3 is located on the side of the pipe section 17 facing the exhaust space section 13.

[0056] It is worth noting that in this embodiment, several pipe segments 17 are continuously bent to extend the flow path of high-temperature flue gas, thereby maximizing the flow time of high-temperature gas in the exhaust pipe 1 and maximizing the heat absorption time, effectively reducing the temperature of the high-temperature flue gas flowing through the exhaust pipe 1.

[0057] In this embodiment, as Figure 5 and Figure 6 As shown, the first end of a pipe segment 17 located at the beginning is open to form an inlet 11; the last end of a pipe segment 17 located at the end is closed, and an outlet 12 is provided on the pipe wall of the last pipe segment 17. Of course, as an alternative implementation, the positions of the inlet 11 and the outlet 12 can be designed according to the specific matching position with the internal space of the housing 2 and the discharge port 21 on the housing 2.

[0058] Specifically, in this embodiment, pipe segment 17 is a square tube with a wall thickness of 0.6mm to 1mm and the material of the square tube is SPCC (cold-rolled carbon steel sheet).

[0059] In one embodiment, such as Figure 6 As shown, the phase change heat absorption layer 3 is covered with a temperature sensing layer 4. This configuration ensures that when the flue gas temperature in the exhaust pipe 1 does not reach the decomposition temperature of the temperature sensing layer 4, the temperature sensing layer 4 remains in a stable, sealed state, thus keeping the phase change heat absorption layer 3 in a closed space and guaranteeing its stability. When the flue gas temperature in the exhaust pipe 1 reaches the decomposition temperature of the temperature sensing layer 4, the temperature sensing layer 4 gradually decomposes, allowing the phase change heat absorption layer 3 to directly contact the high-temperature flue gas in the exhaust pipe 1, achieving heat absorption and cooling of the high-temperature flue gas.

[0060] In one embodiment, such as Figure 5 and Figure 6 As shown, the exhaust duct 1 contains an extinguishing agent 5, which is covered by a temperature-sensitive layer 4. This arrangement ensures that when the flue gas temperature inside the exhaust duct 1 does not reach the decomposition temperature of the temperature-sensitive layer 4, the layer remains stable and sealed, thus keeping the extinguishing agent 5 in a confined space and guaranteeing its stability. When the flue gas temperature inside the exhaust duct 1 reaches the decomposition temperature of the layer 4, the layer gradually decomposes and breaks down, allowing the extinguishing agent 5 to rapidly cool and extinguish the fire instantly, suppressing combustion of the high-temperature flue gas inside the exhaust duct 1.

[0061] Specifically, the extinguishing agent 5 is perfluorohexanone, which has the characteristics of insulation, no damage to batteries, and environmental friendliness. The extinguishing agent 5 is placed on the inner wall of the exhaust pipe 1 near the inlet 11. It can be understood that, apart from the location where the extinguishing agent 5 is placed, the phase change heat absorption layer 3 can be placed on the inner wall of the exhaust pipe 1 at other locations.

[0062] It is worth noting that when the temperature of the environment in which the temperature sensing layer 4 is located is lower than the decomposition temperature of the temperature sensing layer 4 (e.g., 70°C), the temperature sensing layer 4 is in an intact state; when the temperature of the environment in which the temperature sensing layer 4 is located reaches the decomposition temperature of the temperature sensing layer 4, the temperature sensing layer 4 gradually decomposes and breaks down.

[0063] Optionally, in this embodiment, the temperature-sensitive layer 4 can be a PET heat-sealing film.

[0064] In one embodiment, such as Figures 1 to 6 As shown, at least a portion of the outer wall of the exhaust pipe 1 is covered with a heat insulation layer 6. This configuration, using the heat insulation layer 6, improves the structural strength of the exhaust pipe 1 while reducing temperature conduction, enhancing the overall heat insulation effect of the battery pack, and preventing damage to the structure of the exhaust pipe 1 when high-temperature flue gas is directly injected into it.

[0065] Specifically, insulation layer 6 is made of mica board.

[0066] According to an embodiment of the present invention, on the other hand, as... Figure 7 As shown, a battery pack is also provided, including: a housing 2 with an outlet 21; and the aforementioned battery pack exhaust device, which is disposed inside the housing 2 and whose outlet is connected to the outlet 21.

[0067] The battery pack of this embodiment uses a battery pack exhaust device to cool down and discharge the high-temperature fumes inside the battery pack housing 2, preventing them from igniting other structures outside the battery pack, avoiding secondary damage, and improving the overall safety of the battery pack.

[0068] Specifically, the housing 2 includes a shell (not shown in the figure) and a top cover connected together. The top cover encloses an installation space, and an exhaust port 21 is opened on the top cover. Furthermore, an exhaust pipe 1 is disposed within the installation space and connected to the top cover. The side of the exhaust pipe 1 with an outlet 12 is fitted against the inner wall surface of the top cover (e.g., the top surface of the top cover away from the shell), and the outlet 12 and the exhaust port 21 are connected. The inlet 11 is connected to the installation space of the top cover.

[0069] It should be noted that the orthographic projection of the exhaust pipe 1 on the top surface of the cover can occupy most of the area of ​​the top surface of the cover, 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 exhaust pipe 1, thereby maximizing the heat absorption time and effectively reducing the temperature of the high-temperature flue gas flowing through the exhaust pipe 1.

[0070] It is worth noting that, please refer to Figures 1 to 4 The surface of the exhaust pipe 1 that is in contact with the inner wall of the cover may not be provided with a heat insulation layer 6, while the other surfaces exposed to the space of the cover are provided with a heat insulation layer 6.

[0071] In one embodiment, the cross-sectional area of ​​the opening of the exhaust pipe 1 perpendicular to the extension direction is not less than the opening area of ​​the discharge port 21. This arrangement reduces the resistance encountered during flue gas discharge and ensures that the flue gas in the exhaust pipe 1 is smoothly discharged from the discharge port 21.

[0072] It is worth noting that the opening area of ​​the exhaust port 21 meets the exhaust design requirements of the battery pack.

[0073] In one embodiment, the exhaust port 21 is covered with a waterproof and breathable membrane. This arrangement allows gas inside the battery pack housing 2 to be discharged through the membrane, and when the gas pressure inside the exhaust pipe 1 becomes too high, the gas can push open the waterproof and breathable membrane, enabling rapid discharge of smoke from the battery pack housing 2, preventing battery pack explosions and other safety accidents, and improving the safety performance of the battery pack.

[0074] Specifically, the waterproof and breathable membrane is an PETFE (polytetrafluoroethylene) membrane. The waterproof and breathable membrane is connected to the top cover and covers the discharge port 21 by ultrasonic welding.

[0075] When the battery inside the battery pack of this embodiment is ejected, a high-temperature jet of particulate matter, accompanied by high-temperature gas, is ejected from the top exhaust port of the battery. The high-temperature jet and high-temperature gas enter the upper cover space. As the battery ejection time increases, the air pressure and temperature in the upper cover space gradually increase. The high-temperature and high-pressure gas has nowhere to be released and can only enter the exhaust pipe 1 through the inlet 11 of the exhaust pipe 1. When the high-temperature flue gas enters the exhaust pipe 1, the temperature sensing layer 4 is decomposed by heat, exposing the fire extinguishing agent 5 and the phase change heat absorption layer 3 to the high-temperature flue gas. The fire extinguishing agent 5 and the phase change heat absorption layer 3 play a role in rapidly cooling the high-temperature flue gas, extinguishing the fire instantly, and continuously suppressing reignition. 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 21.

[0076] 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 venting device, located inside the battery pack housing (2), characterized in that, include: An exhaust pipe (1) has an inlet (11) and an outlet (12). The inlet (11) is connected to the internal space of the housing (2), and the outlet (12) is connected to the discharge port (21) on the housing (2). A plurality of exhaust space segments (13) are formed inside the exhaust pipe (1). The plurality of exhaust space segments (13) are parallel and arranged side by side along the extension direction perpendicular to the exhaust pipe (1), or the plurality of exhaust space segments (13) are connected end to end along the extension direction of the exhaust pipe (1), and adjacent exhaust space segments (13) are connected at a predetermined angle. A phase change heat absorption layer (3) is disposed on the inner wall of the exhaust pipe (1).

2. The battery pack venting device according to claim 1, characterized in that, The exhaust pipe (1) includes a pipe body (14) and a partition (15). The partition (15) is disposed inside the pipe body (14). The partition (15) is provided with at least one partition to divide the internal space of the pipe body (14) into at least two parallel exhaust space segments (13). A connecting port (151) is provided on the partition (15) to connect two adjacent exhaust space segments (13). The inlet (11) and the outlet (12) are respectively located on the pipe body (14). The inner wall of the pipe body (14) and / or the surface of the partition (15) are provided with the phase change heat absorption layer (3).

3. The battery pack venting device according to claim 2, characterized in that, Flame-retardant blocks (16) are provided between the pipe body (14) and the partition (15) and / or between adjacent partitions (15).

4. The battery pack venting device according to claim 1, characterized in that, The exhaust pipe (1) includes several pipe segments (17), which are connected end to end along the extension direction of the exhaust pipe (1). Adjacent pipe segments (17) are connected at a predetermined angle. Each pipe segment (17) forms an exhaust space segment (13). At least a portion of the pipe segments (17) have the phase change heat absorption layer (3) on their inner walls.

5. The battery pack venting device according to any one of claims 1 to 4, characterized in that, The phase change heat absorption layer (3) is covered with a temperature sensing layer (4).

6. The battery pack venting device according to any one of claims 1 to 4, characterized in that, The exhaust pipe (1) is equipped with a fire extinguishing agent (5), and the fire extinguishing agent (5) is covered with a heat-sensitive layer (4).

7. The battery pack venting device according to any one of claims 1 to 4, characterized in that, At least a portion of the outer wall of the exhaust pipe (1) is covered with a heat insulation layer (6).

8. A battery pack, characterized in that, include: The container (2) has an outlet (21); The battery pack exhaust device according to any one of claims 1 to 7 is disposed inside the housing (2) and the outlet (12) is connected to the discharge port (21).

9. The battery pack according to claim 8, characterized in that, The cross-sectional area of ​​the opening of the exhaust pipe (1) perpendicular to the extension direction is not less than the opening area of ​​the discharge port (21).

10. The battery pack according to claim 8, characterized in that, The discharge port (21) is covered with a waterproof and breathable membrane.

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