Drying device, battery pack and vehicle

Abstract

The utility model relates to the technical field of vehicles, and discloses a drying device, a battery pack and a vehicle. The drying device comprises a shell, a drying assembly and a pressure relief assembly, the shell is provided with a drying cavity and a pressure relief cavity, and the drying assembly is arranged in the drying cavity. The shell is provided with a first heat diffusion exhaust port and a pressure relief exhaust port, and the pressure relief cavity is communicated with the interior of a battery pack of the battery through the first heat diffusion exhaust port. The pressure relief chamber is in one-way conduction with external air through the pressure relief assembly, when the battery is in thermal runaway, high-temperature gas released by the battery cell enters the pressure relief chamber through the first thermal diffusion exhaust port, and the high-temperature gas is discharged to the outside under the one-way conduction action of the pressure relief assembly, so that the high-temperature air is discharged at the first time when the battery is in thermal runaway; according to the drying device, the drying function and the explosion-proof function are integrated, the integration degree is high, the structure is compact, and the occupied space is small.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially relates to a drying device, battery pack and vehicle. BACKGROUND

[0002] The battery pack is the power source of electric or hybrid vehicles, and the safety of the battery pack directly affects the safety of the vehicle.

[0003] The battery pack shell inside humidity is too high possibly forms the condensation, can accelerate the corrosion of the metal element in the battery pack, and the electrical parts arrangement space in the battery pack is compact, and the condensation gathers or drops on the electrical parts surface, and when serious, short circuit is formed, causes the battery pack electrical insulation failure, affects the safe operation of the vehicle. In order to eliminate the security risk that the condensation generates, some battery packs are equipped with drying devices to reduce the humidity inside the battery pack. At present, the battery pack is usually configured with an explosion-proof pressure relief valve, when the battery occurs thermal runaway, the high-temperature gas released by the battery cell is discharged through the explosion-proof pressure relief valve. The drying device of the existing battery pack and the explosion-proof pressure relief valve are independently arranged on the battery shell, and the structure is not compact enough, and the integration degree is low. SUMMARY

[0004] Based on the above problems, the purpose of the utility model is to provide a drying device, a battery pack and a vehicle, which can integrate the drying function and the explosion-proof function into one, have high integration degree, compact structure and small space occupation.

[0005] To achieve the above purpose, the following technical scheme is provided:

[0006] In a first aspect, the utility model provides a drying device, comprising:

[0007] A shell is provided with a drying chamber and a pressure relief chamber, and external air is communicated with the inside of the battery pack through the drying chamber, and the shell is provided with a first heat diffusion exhaust port, and the pressure relief chamber is communicated with the inside of the battery pack through the first heat diffusion exhaust port;

[0008] A drying assembly is arranged in the drying chamber;

[0009] A pressure relief assembly is arranged in the pressure relief chamber and is unidirectionally communicated with external air.

[0010] As an optional scheme of the drying device provided by the utility model, a partition structure is arranged in the shell, and the partition structure divides the inner cavity of the shell into the drying chamber and the pressure relief chamber.

[0011] As an optional scheme of the drying device provided by the utility model, the shell is provided with a battery end air vent, the drying chamber is communicated with the inside of the battery pack through the battery end air vent, and the first heat diffusion exhaust port and the battery end air vent are located on the same side of the shell.

[0012] As an optional scheme of the drying device provided by the utility model, the first heat diffusion exhaust port comprises a center circular hole and a plurality of fan-shaped holes, and the plurality of fan-shaped holes are distributed on the outer peripheral side of the center circular hole.

[0013] As an optional scheme of the drying device provided by the utility model, the shell is provided with a pressure relief exhaust port, the pressure relief assembly comprises a pressure relief shell and a pressure relief valve body, the inner cavity of the pressure relief shell is communicated with the pressure relief chamber through the pressure relief exhaust port, the pressure relief shell is provided with a second heat diffusion exhaust port, the inner cavity of the pressure relief shell is communicated with the outside through the second heat diffusion exhaust port, the pressure relief valve body is movably arranged in the pressure relief shell, and the pressure relief valve body can open or close the pressure relief exhaust port.

[0014] As an optional scheme of the drying device provided by the utility model, the pressure relief shell is a hollow rotary body, and the second heat diffusion exhaust port is arranged on the side wall of the hollow rotary body.

[0015] As an optional scheme of the drying device provided by the utility model, the pressure relief valve body comprises a pressure relief valve core, the pressure relief valve core comprises a sliding part and a plugging part connected with each other, the sliding part movably penetrates the side wall of the shell, and the plugging part is located in the inner cavity of the pressure relief shell.

[0016] As an optional scheme of the drying device provided by the utility model, the pressure relief valve core further comprises a stop part connected with the sliding part, and the stop part is located in the pressure relief chamber.

[0017] As an optional scheme of the drying device provided by the utility model, the drying assembly comprises a drying agent layer, a first heating plate and a second heating plate, and the drying agent layer is located between the first heating plate and the second heating plate.

[0018] In a second aspect, the utility model further provides a battery pack comprising a battery shell and the above-mentioned drying device, wherein the drying device is arranged on the battery shell.

[0019] In a third aspect, the utility model further provides a vehicle comprising the above-mentioned battery pack.

[0020] The utility model has the advantages of:

[0021] The drying device, the battery pack and the vehicle provided by the utility model have the advantages that the outside air is reduced in humidity under the drying action of the drying assembly in the drying chamber and then enters the battery, the air entering the inside of the battery pack is always low in humidity, the low humidity cannot reach the dew condensation forming condition, the short circuit or the thermal runaway safety hazard caused by the dew condensation is eliminated, the dew condensation effect is realized in the whole life cycle of the battery pack, the corrosion degree of the metal components in the inside of the battery pack is reduced, and the electrical safety is more reliable, when the battery has thermal runaway, the high-temperature gas released by the battery cell enters the pressure relief chamber through the first heat diffusion exhaust port, the high-temperature gas is discharged to the outside under the one-way conduction action of the pressure relief assembly, the high-temperature air is discharged in the first time of the battery thermal runaway, the pressure in the battery pack is released, and the safety of the battery, the vehicle and the personnel is ensured, the drying device integrates the drying function and the explosion-proof function, is high in integration degree, compact in structure and small in occupied space. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the following description of the embodiments of the utility model will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and these drawings without the creative labor of the person skilled in the art.

[0023] Figure 1 It is the structure schematic diagram of the drying device provided by the embodiment of the utility model,

[0024] Figure 2 It is the structure schematic diagram of the drying device provided by the embodiment of the utility model under one visual angle,

[0025] Figure 3 It is Figure 2 the sectional view schematic diagram of A-A in it,

[0026] Figure 4 It is the structure schematic diagram of the drying device provided by the embodiment of the utility model under another visual angle,

[0027] Figure 5 It is Figure 4 the sectional view schematic diagram of B-B in it,

[0028] Figure 6 It is the structure schematic diagram of the drying device provided by the embodiment of the utility model under still another visual angle,

[0029] Figure 7 It is Figure 6 the sectional view schematic diagram of C-C in it.

[0030] In the drawings,

[0031] 1, housing; 2, drying assembly; 3, pressure relief assembly;

[0032] 11, partition structure; 12, drying chamber; 13, pressure relief chamber; 14, first heat-diffusion exhaust port; 15, pressure relief exhaust port; 16, battery end vent; 17, external vent; 18, drying exhaust port; 19, sealing ring;

[0033] 21, desiccant layer; 22, first heating plate; 23, second heating plate; 24, heating module; 25, humidity sensor;

[0034] 31, pressure relief housing; 311, second heat-diffusion exhaust port; 32, pressure relief valve body; 321, pressure relief valve core; 3211, sliding part; 3212, blocking part; 3213, stop part. DETAILED DESCRIPTION

[0035] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the embodiments of the utility model will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0036] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0037] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0038] As Figures 1 to 7As shown, the present embodiment provides a drying device for drying the external air entering the inside of the battery to prevent the air humidity inside the battery from being too high. The drying device comprises a shell 1, a drying assembly 2 and a pressure relief assembly 3. The shell 1 can be a square shell structure, and the length, width and height of the shell 1 can all be less than 500 mm to match the conventional battery pack. A partition structure 11 can be arranged in the shell 1. The partition structure 11 can be a plate structure, and the partition structure 11 separates the inner cavity of the shell 1 into a drying chamber 12 and a pressure relief chamber 13. The drying chamber 12 and the pressure relief chamber 13 are not communicated with each other. The space of the drying chamber 12 can be greater than that of the pressure relief chamber 13. The external air is communicated with the inside of the battery pack through the drying chamber 12, and the drying assembly 2 is arranged in the drying chamber 12. Of course, the drying chamber 12 and the pressure relief chamber 13 can also be formed by overmolding when the shell 1 is formed.

[0039] The external air enters the inside of the battery after being dried by the drying assembly 2 in the drying chamber 12, so that the air entering the inside of the battery pack is always at a low humidity. In this low humidity, the condensation forming condition cannot be met, and the short circuit or thermal runaway safety hazard caused by condensation is eliminated. The anti-condensation effect is realized throughout the life cycle of the battery pack, the corrosion degree of the metal components in the battery pack is reduced, and the electrical safety is more reliable.

[0040] The shell 1 is provided with a first heat diffusion exhaust port 14 and a pressure relief exhaust port 15. The pressure relief chamber 13 is communicated with the inside of the battery pack through the first heat diffusion exhaust port 14. The pressure relief chamber 13 is unidirectionally communicated with the external air through the pressure relief assembly 3. When the battery occurs thermal runaway, the high-temperature gas released by the battery cell enters the pressure relief chamber 13 through the first heat diffusion exhaust port 14. Under the action of the unidirectional communication of the pressure relief assembly 3, the high-temperature gas is discharged to the outside, ensuring that the high-temperature air is discharged in the first time of battery thermal runaway, releasing the pressure in the battery pack, and ensuring the safety of the battery, vehicle and personnel. The drying device integrates the drying function and the explosion-proof function, has high integration, compact structure and small space occupation.

[0041] In some embodiments, the pressure relief assembly 3 can comprise a pressure relief shell 31 and a pressure relief valve body 32. The pressure relief shell 31 can be arranged on the shell 1 or independently arranged relative to the shell 1. The inner cavity of the pressure relief shell 31 is communicated with the pressure relief chamber 13 through the pressure relief exhaust port 15. The pressure relief shell 31 is provided with a second heat diffusion exhaust port 311. The inner cavity of the pressure relief shell 31 is communicated with the outside through the second heat diffusion exhaust port 311. The pressure relief valve body 32 is movably arranged in the pressure relief shell 31. The pressure relief valve body 32 can open or close the pressure relief exhaust port 15. The pressure relief valve body 32 has an open position and a closed position. The pressure relief valve body 32 in the open position opens the pressure relief exhaust port 15, and the pressure relief valve body 32 in the closed position closes the pressure relief exhaust port 15.

[0042] When the battery is in thermal runaway, the high-temperature gas released by the battery cell enters the pressure relief chamber 13 through the first heat diffusion exhaust port 14. The air pressure of the pressure relief exhaust port 15 causes the pressure relief valve body 32 to switch from the closed position to the open position. At this time, the pressure relief exhaust port 15 is connected to the pressure relief chamber 13 and the inner cavity of the pressure relief shell 31. The high-temperature gas enters the inner cavity of the pressure relief shell 31 and is then discharged to the outside through the second heat diffusion exhaust port 311. This ensures that the high-temperature air is discharged in the first time of battery thermal runaway, releasing the pressure in the battery pack and ensuring the safety of the battery, vehicle and personnel. The drying device integrates drying and explosion-proof functions, has high integration, compact structure and small space occupation.

[0043] Optionally, the shell 1 is provided with a battery end air port 16. The drying chamber 12 communicates with the inside of the battery pack through the battery end air port 16. The first heat diffusion exhaust port 14 and the battery end air port 16 are located on the same side of the shell 1. The first heat diffusion exhaust port 14 is arranged near the battery side, which can introduce the high-temperature gas generated by the battery thermal runaway into the pressure relief chamber 13 in the first time, preventing the battery pack from exploding due to excessive air pressure. The shell 1 is also provided with an external air port 17. The drying chamber 12 communicates with the outside through the external air port 17. The outside air enters the drying chamber 12 through the external air port 17. The external air port 17 and the battery end air port 16 can be located on opposite sides of the shell 1, respectively. Of course, according to the arrangement space of the whole vehicle and the battery pack, the external air port 17 and the battery end air port 16 can be selected to face different directions or the same direction, which can be arranged according to actual needs. The shell 1 is also provided with a sealing ring 19, which plays a sealing role when the drying device is connected to the battery shell. The battery end air port 16 and the first heat diffusion exhaust port 14 are located in the sealing ring 19

[0044] In some embodiments, the first heat diffusion exhaust port 14 can include a central circular hole and a plurality of fan-shaped holes distributed on the outer peripheral side of the central circular hole. The hollow design of the central circular hole and the fan-shaped hole can avoid the opening of the first heat diffusion exhaust port 14 being too concentrated to affect the structural strength of the shell 1 at this position.

[0045] Optionally, the pressure relief shell 31 is a hollow rotary body, and the second heat diffusion exhaust port 311 is arranged on the side wall of the hollow rotary body. The second heat diffusion exhaust port 311 can be an elongated square hole. The second heat diffusion exhaust port 311 is arranged on the side wall of the pressure relief shell 31, which can buffer and guide the high-temperature gas in the pressure relief shell 31. The pressure relief shell 31 can be a circular cap structure, which is easy to process and manufacture.

[0046] In some embodiments, the pressure relief valve body 32 can include a pressure relief valve core 321 and a resilient member, the pressure relief valve core 321 is in sliding fit with the outer shell 1, and the pressure relief valve core 321 has a tendency to keep the pressure relief exhaust port 15 closed under the elastic action of the resilient member. The pressure relief valve core 321 adopts a sliding motion mode and is not easy to be damaged, and the switching of the pressure relief valve body 32 between the open position and the closed position is facilitated. The resilient member can be a spring. When the pressure relief valve body 32 is in the open position, the high-pressure gas flow in the pressure relief chamber 13 impacts the pressure relief valve core 321, the spring is compressed and stored energy, when the high-pressure gas flow in the pressure relief chamber 13 disappears, the spring releases the elastic potential energy, and pushes the pressure relief valve core 321 back to the position of closing the pressure relief exhaust port 15, at this time, the pressure relief valve body 32 is in the closed position for repeated use.

[0047] Of course, the pressure relief valve body 32 can also not be provided with a resilient member, and the pressure relief valve core 321 itself has elastic deformation capability to open or close the pressure relief exhaust port 15. Alternatively, the pressure relief valve core 321 includes a sliding part 3211 and a blocking part 3212 connected with each other, the sliding part 3211 is movably penetrated through the side wall of the outer shell 1, and the blocking part 3212 is located in the inner cavity of the pressure relief shell 31. The blocking part 3212 can be an umbrella-shaped elastic structure, and the sliding part 3211 can be a rod-shaped structure. The side wall of the outer shell 1 is provided with a through hole, and the sliding part 3211 movably penetrates through the through hole. Of course, the pressure relief valve body 32 can also be a valve structure such as a valve pressure valve, a spring valve, a gravity valve, a swing pressure valve, a diaphragm pressure valve, and a gas pressure driven one-way valve. The pressure relief exhaust port 15 can be circular, square or other special-shaped structure, which can be flexibly adjusted according to actual arrangement requirements.

[0048] To prevent the sliding part 3211 from being separated from the side wall of the outer shell 1, the pressure relief valve core 321 also includes a stop part 3213 connected with the sliding part 3211, and the stop part 3213 is located in the pressure relief chamber 13. When the pressure relief valve core 321 is in the open position, the blocking part 3212 is continuously impacted by the gas flow, and the stop part 3213 can abut against the inner wall of the outer shell 1, thereby limiting the sliding part 3211 from continuing to slide and being separated from the side wall of the outer shell 1.

[0049] In some embodiments, the drying assembly 2 can include a drying agent layer 21, a first heating plate 22 and a second heating plate 23, and the drying agent layer 21 is located between the first heating plate 22 and the second heating plate 23. The drying agent layer 21 is filled with a drying agent, and the drying agent can be heated by the first heating plate 22 and the second heating plate 23, so that the drying agent can be recycled. The pressure relief assembly 3 further includes a heating module 24 and a humidity sensor 25. The humidity sensor 25 detects the humidity of the air in the drying chamber 12. When the humidity of the air in the drying chamber 12 is high, it means that the drying agent needs to be heated. The heating module 24, the first heating plate 22 and the second heating plate 23 are used to heat the drying agent, so that the drying agent can be recycled. The shell 1 is also provided with a drying exhaust port 18. The humid air generated by the heated drying agent is discharged from the shell 1 through the drying exhaust port 18. The drying agent has the ability to quickly absorb air humidity and has the characteristic of not changing after several hundred or tens of thousands of repeated drying. Therefore, it can be repeatedly used without replacement. The drying exhaust port 18 can be provided with a one-way exhaust valve. When the internal pressure of the device is greater than the external pressure, the exhaust valve can be opened to discharge the gas outside the device when the set pressure threshold is met. Conversely, when the external pressure is greater than or equal to the internal pressure, the exhaust valve cannot be opened, so the external air cannot enter the device interior, thereby ensuring the sealing of this position.

[0050] It can be understood that the battery pack is usually a sealed structure, which can exchange air with the outside world, but does not allow liquid water to enter. The external air port 17 and the drying exhaust port 18 are both air-permeable and water-impermeable structures. The battery end air port 16 can be optionally used with or without a waterproof and air-permeable film, and can be a waterproof structure or not.

[0051] When the battery pack is not working for a long time or the external environment does not change, the air pressure inside and outside the battery pack is balanced. At this time, there is no air exchange between the inside and outside of the battery pack, so no air flows through the inside of the drying agent, and the drying device does not work.

[0052] When the battery pack is working or the external environment changes, it can be divided into the following two cases:

[0053] (1) When the external air pressure is higher than the internal air pressure of the battery pack, the humid air outside the battery enters the drying device through the external air port 17. After the humid air passes through the drying agent in the drying device, the water is absorbed by the drying agent to become dry air or low-humidity air, which enters the inside of the battery pack through the battery end air port 16, so as to ensure that the air entering the inside of the battery pack is in a dry state with low humidity. In this low humidity, it is difficult to form condensation in the inside of the battery pack.

[0054] (2) When the external air pressure is lower than the internal air pressure of the battery pack, the dry air in the battery pack can be discharged outside the battery pack through the drying chamber 12 or the pressure relief chamber 13 of the drying device, so as to balance the air pressure in the battery pack. The original dry air in the battery pack is also not enough to form condensation.

[0055] The battery pack also includes a battery shell and the above-described drying device, which is arranged on the battery shell. External air is dried by the drying assembly 2 in the drying chamber 12 to reduce the humidity, and then enters the battery. The air entering the battery pack is always at a low humidity, which cannot reach the dew formation condition, thereby eliminating the short circuit or thermal runaway safety hazard caused by dew, achieving the anti-dew effect throughout the life cycle of the battery pack, reducing the corrosion of metal components in the battery pack, and making the electrical safety more reliable. When the battery overheats, the high-temperature gas released by the battery enters the pressure relief chamber 13 through the first heat diffusion exhaust port 14. The air pressure of the pressure relief exhaust port 15 causes the pressure relief valve body 32 to switch from the closed position to the open position. At this time, the pressure relief exhaust port 15 connects the pressure relief chamber 13 and the inner cavity of the pressure relief shell 31. The high-temperature gas enters the inner cavity of the pressure relief shell 31 and is then discharged to the outside through the second heat diffusion exhaust port 311. This ensures that the battery overheats and releases high-temperature air at the first time, releases the pressure in the battery pack, and ensures the safety of the battery, vehicle, and personnel. The drying device integrates the drying function and the explosion-proof function, has high integration, compact structure, and small space occupation.

[0056] The vehicle also includes a vehicle frame and the above-described battery pack arranged on the vehicle frame. External air is dried by the drying assembly 2 in the drying chamber 12 to reduce the humidity, and then enters the battery. The air entering the battery pack is always at a low humidity, which cannot reach the dew formation condition, thereby eliminating the short circuit or thermal runaway safety hazard caused by dew, achieving the anti-dew effect throughout the life cycle of the battery pack, reducing the corrosion of metal components in the battery pack, and making the electrical safety more reliable. When the battery overheats, the high-temperature gas released by the battery enters the pressure relief chamber 13 through the first heat diffusion exhaust port 14. The air pressure of the pressure relief exhaust port 15 causes the pressure relief valve body 32 to switch from the closed position to the open position. At this time, the pressure relief exhaust port 15 connects the pressure relief chamber 13 and the inner cavity of the pressure relief shell 31. The high-temperature gas enters the inner cavity of the pressure relief shell 31 and is then discharged to the outside through the second heat diffusion exhaust port 311. This ensures that the battery overheats and releases high-temperature air at the first time, releases the pressure in the battery pack, and ensures the safety of the battery, vehicle, and personnel. The drying device integrates the drying function and the explosion-proof function, has high integration, compact structure, and small space occupation.

[0057] It should be noted that the above only the preferred embodiments of the present application and the use of technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments here, those skilled in the art can be made various obvious changes, re-adjustment and replacement without departing from the scope of the present application. Therefore, although the above embodiments of the present application has been described in more detail, but the present application is not limited to the above examples, without departing from the concept of the present application, but also can include more other equivalent embodiments, and the scope of the present application is determined by the appended claims.

Claims

1. Drying apparatus, characterized in that The application relates to a battery pack, which comprises the following parts: an outer shell (1) provided with a drying chamber (12) and a pressure relief chamber (13), external air being communicated with the inside of the battery pack through the drying chamber (12), the outer shell (1) being provided with a first heat-diffusion exhaust port (14), the pressure relief chamber (13) being communicated with the inside of the battery pack through the first heat-diffusion exhaust port (14); a drying assembly (2) arranged in the drying chamber (12); a pressure relief assembly (3), the pressure relief chamber (13) being unidirectionally communicated with external air through the pressure relief assembly (3).

2. The drying apparatus of claim 1, wherein The outer shell (1) is provided with a partition structure (11), which divides the inner cavity of the outer shell (1) into the drying chamber (12) and the pressure relief chamber (13).

3. The drying apparatus of claim 1, wherein The outer shell (1) is provided with a battery end air vent (16), the drying chamber (12) is communicated with the inside of the battery pack through the battery end air vent (16), and the first heat-diffusion exhaust port (14) and the battery end air vent (16) are located on the same side of the outer shell (1).

4. The drying apparatus of claim 1, wherein The first heat-diffusion exhaust port (14) comprises a central circular hole and a plurality of fan-shaped holes, and the plurality of fan-shaped holes are distributed on the outer peripheral side of the central circular hole.

5. The drying apparatus according to any one of claims 1 to 4, characterized in that The outer shell (1) is provided with a pressure relief exhaust port (15), the pressure relief assembly (3) comprises a pressure relief shell (31) and a pressure relief valve body (32), the inner cavity of the pressure relief shell (31) is communicated with the pressure relief chamber (13) through the pressure relief exhaust port (15), the pressure relief shell (31) is provided with a second heat-diffusion exhaust port (311), the inner cavity of the pressure relief shell (31) is communicated with the outside through the second heat-diffusion exhaust port (311), and the pressure relief valve body (32) is movably arranged in the pressure relief shell (31) and can open or close the pressure relief exhaust port (15).

6. The drying apparatus of claim 5, wherein The pressure relief shell (31) is a hollow rotary body, and the second heat-diffusion exhaust port (311) is arranged on the side wall of the hollow rotary body.

7. The drying apparatus of claim 5, wherein The pressure relief valve body (32) comprises a pressure relief valve core (321), the pressure relief valve core (321) comprises a sliding part (3211) and a plugging part (3212) connected with each other, the sliding part (3211) movably penetrates the side wall of the outer shell (1), and the plugging part (3212) is located in the inner cavity of the pressure relief shell (31).

8. The drying apparatus of claim 7, wherein The pressure relief valve core (321) further comprises a stop part (3213) connected with the sliding part (3211), and the stop part (3213) is located in the pressure relief chamber (13).

9. The drying apparatus according to any one of claims 1 to 4, characterized in that The drying assembly (2) comprises a drying agent layer (21), a first heating plate (22) and a second heating plate (23), and the drying agent layer (21) is located between the first heating plate (22) and the second heating plate (23).

10. A battery pack, characterized by, The application further relates to a battery pack comprising the battery shell and the drying device as claimed in any one of claims 1-9.

11. Vehicle, characterized in that The application further relates to a battery pack comprising the battery shell and the drying device as claimed in any one of claims 1-9.

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