Gas supply system and battery swap station

Abstract

The utility model discloses a gas supply system and a battery swap station. The gas supply system is used for supplying gas to a battery pack (20) in a battery compartment (10). The gas supply system comprises a supply gas path (100), a pressure boosting device (200), a cooling and dehumidifying unit and a pressure reducing device (700), wherein the supply gas path (100) is used for supplying gas from a battery cabin (10) in which a battery pack (20) is positioned into the battery pack (20); the pressure boosting device (200), the cooling and dehumidifying unit and the pressure reducing device (700) are sequentially arranged in the supply gas path (100) along the gas flowing direction; the cooling and dehumidifying unit is positioned at the downstream of the pressure boosting device (200); and a switching valve (400) located downstream of the decompression device (700). The battery swap station comprises the gas supply system. By means of the cooling device, condensed water can be prevented from being formed in the battery pack, and the auxiliary cooling effect on the battery pack can be achieved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a gas supply system and a corresponding battery swap station. Background Art

[0002] A battery swap station is a facility that provides battery replacement services for electric vehicles. It can quickly replace the batteries of electric vehicles and enable electric vehicles to restore their range in a short period of time, thereby greatly shortening the "refueling" time of electric vehicles and improving the convenience and operational efficiency of electric vehicles. In addition, the battery swap station can centrally manage and maintain the batteries, including charging, discharging, testing and maintenance, to ensure the performance and life of the batteries. Therefore, the battery swap station may include a battery compartment, and the battery pack for electric vehicles can be charged and discharged in the battery compartment.

[0003] During the charging of the battery pack, it is usually necessary to cool the cells inside the battery pack. At this time, if the humidity inside the battery pack is very high, condensation or condensed water is likely to occur, which will adversely affect the performance and safety of the battery. Therefore, dry gas needs to be supplied to the battery pack in the battery compartment of the battery swap station to dry or dehumidify the corresponding battery pack. However, if the dry gas provided by the gas supply system causes the battery pack to bulge due to excessive internal and external pressure differences, it will also adversely affect the performance and safety of the battery. Utility Model Content

[0004] In view of the above problems, the present application provides a gas supply system for supplying gas to a battery pack in a battery compartment and a corresponding battery swap station, which can not only prevent the formation of condensed water inside the battery pack, but also play an auxiliary role in cooling the battery pack. Furthermore, it can controllably or adjustably supply dry gas to the battery pack.

[0005] According to a first aspect, the present application provides a gas supply system for supplying gas to a battery pack in a battery compartment, characterized in that the gas supply system comprises: a supply gas circuit for supplying gas from a battery compartment where the battery pack is located to the battery pack, and a boosting device, a cooling and dehumidifying unit located downstream of the boosting device, a pressure reducing device located downstream of the cooling and dehumidifying unit, and a switch valve located downstream of the pressure reducing device, which are sequentially arranged in the supply gas circuit along the gas flow direction.

[0006] Therefore, in the technical solution of the embodiment of the present application, low-temperature dry gas can be supplied to the battery pack by arranging a boosting device, a cooling and dehumidifying unit, and a pressure reducing device in the gas supply path. This not only avoids the formation of condensed water inside the battery pack, but also helps cool the battery pack.

[0007] In some embodiments, the gas supply system further includes a control system, the control system includes a first detection device arranged between the pressure reducing device and the switch valve, and the control system controls the switch valve and / or the cooling and dehumidifying unit and / or the pressure reducing device based on the state of the gas detected by the first detection device. Therefore, the dry gas provided by the gas supply system according to the present disclosure can be supplied to the battery pack in a precisely controllable or adjustable state.

[0008] In some embodiments, the first detection device includes a first pressure sensor, a first temperature sensor, and a humidity sensor. Therefore, the control system can monitor and adjust the humidity, pressure, and temperature of the supplied dry gas, so that the dry gas can be supplied to the battery pack with adjustable humidity, temperature, and pressure. That is, the gas supply system is able to supply gas with substantially constant humidity, temperature, and pressure to the battery pack. Therefore, it can not only regulate the temperature of the battery pack, but also prevent the battery pack from bulging due to excessive internal and external pressure differences, so as to ensure the performance and safety of the battery.

[0009] In some embodiments, the control system further comprises a second detection device arranged between the pressure reducing device and the cooling and dehumidifying unit and a three-way valve arranged between the second detection device and the pressure reducing device, and the control system controls the three-way valve and / or the cooling and dehumidifying unit according to the state of the gas detected by the second detection device. Thus, the supplied gas can be preliminarily detected and the three-way valve and / or the cooling and dehumidifying unit can be controlled accordingly. Thus, the preliminary adjustment of the supplied gas can be achieved.

[0010] In some embodiments, the second detection device includes a second pressure sensor and a second temperature sensor, so that the control system can preliminarily monitor and adjust the pressure and temperature of the supplied drying gas.

[0011] In some embodiments, the control system further comprises a flow meter disposed between the pressure reducing device and the switch valve, and the control system controls the flow meter according to the number of battery packs connected in the battery compartment. Therefore, the dry gas provided by the gas supply system can also be supplied to the battery pack in a precisely controllable or adjustable flow rate.

[0012] In some embodiments, the pressure increasing device is configured as an air compressor, and / or the pressure reducing device is configured as an electronic pressure reducing valve, thereby making it possible to simply implement the pressure increasing device and / or the pressure reducing device.

[0013] In some embodiments, the cooling and dehumidifying unit includes a primary air cooling device and a secondary liquid cooling device, the primary air cooling device is arranged between the boosting device and the secondary liquid cooling device, the primary air cooling device is configured as an air-to-air cooler, and the secondary liquid cooling device is configured as an evaporator. Thus, a two-stage cooling and dehumidifying unit can be simply realized, thereby achieving extremely effective cooling and dehumidification of high-pressure and high-temperature gas.

[0014] In some embodiments, an air storage tank is arranged between the primary air cooling device and the secondary liquid cooling device, and a pressure sensor and a pressure safety valve are arranged in the air storage tank, thereby preventing the air compressor from working continuously, thereby extending the service life of the air compressor.

[0015] In some embodiments, a gas-liquid separator is arranged between the cooling and dehumidifying unit and the pressure reducing device, thereby further dehumidifying the gas. In addition, the gas-liquid separator can also be considered as a third-stage dehumidification device after the primary air cooling device and the secondary liquid cooling device.

[0016] In some embodiments, the battery pack is a battery pack for commercial vehicles. Since battery packs for commercial vehicles are more prone to condensation inside, for example, when charging, the gas supply system is particularly suitable for supplying gas to battery packs for commercial vehicles, especially heavy trucks.

[0017] According to a second aspect, the present application provides a battery swap station, which includes a battery compartment and a gas supply system according to the first aspect of the present disclosure as described above, wherein the gas supply system is capable of supplying gas to a battery pack in the battery compartment.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only used for the purpose of illustrating the preferred embodiments and are not to be considered as limitations of the present application. In addition, the same reference numerals are used throughout the drawings to represent the same components.

[0020] Figure 1 FIG. 1 is an exemplary schematic diagram of a gas supply system for supplying gas to a battery pack in a battery compartment according to the prior art.

[0021] Figure 2 This is an exemplary schematic diagram of a gas supply system for supplying gas to a battery pack in a battery compartment according to some embodiments of the present application.

[0022] The figure numbers in the specific implementation manner are as follows: battery compartment 10; battery pack 20; pressure regulating valve 21; exhaust valve 22; supply air circuit 100; air compressor 200; air dryer 300; switch valve 400; first detection device 40; second detection device 50; three-way valve 60; flow meter 70; timed electronic switch valve 80; timed electronic switch valve 90; secondary liquid cooling device 310; compressor 311; condenser 312; filter 313; expansion valve 314; primary air cooling device 320; blower 321; air storage tank 500; pressure sensor 501; pressure safety valve 502; gas-liquid separator 600; pressure reducing device 700. DETAILED DESCRIPTION

[0023] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0025] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0028] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0029] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0030] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0031] At present, electric vehicles or hybrid vehicles, as a new energy vehicle, have been widely popularized in recent years. Electric vehicles or hybrid vehicles use on-board power batteries as a power source at least in part. Power batteries used in electric vehicles or hybrid vehicles can be used repeatedly. Accordingly, electric vehicles or hybrid vehicles can ensure their endurance by charging (fast charging, slow charging) or replacing batteries.

[0032] For example, in a battery swap station, as mentioned above, a replacement service can be provided for power batteries used in electric vehicles or hybrid vehicles, and a large number of batteries can be centrally stored, centrally charged, and uniformly distributed. The power battery (which is placed on a battery rack in a battery swap station, for example) needs to be in a roughly constant temperature range during charging. In order to meet such needs, a liquid cooling system, especially a water cooling system, is usually configured in the battery swap station to perform cold or warm treatment on the power battery. In this case, if the humidity inside the battery pack is very high, the gas inside it, especially the high humidity and high temperature, is easy to produce condensation or condensed water in the battery pack, especially near the cold plate of the liquid cooling system (for example, its temperature is <10°C), thereby adversely affecting the performance and safety of the battery (such as insulation failure). Therefore, a gas supply system can be set in the battery compartment of the battery swap station to dry or dehumidify the corresponding battery pack.

[0033] However, the current gas supply system for supplying gas to the battery pack in the battery compartment usually uses an adsorption desiccant to dehumidify the gas. In this case, although dry gas can be provided to the battery pack, the temperature and pressure of the gas supplied to the battery pack cannot be accurately controlled or adjusted. In this case, the dry gas provided by the gas supply system may cause the battery pack to swell due to the large pressure difference between the inside and outside, which may also adversely affect the performance and safety of the battery.

[0034] See for example Figure 1 , Figure 1 : is an exemplary schematic diagram of a gas supply system for supplying gas to a battery pack in a battery compartment according to the prior art. The gas supply system may include an air compressor 200, a polymer membrane air dryer 300 and a switch valve 400 in a supply gas path 100, for example, from the inside of the battery compartment 10 to the air inlet of the battery pack 20. For example, when the battery pack 20 is connected to the battery compartment 10, the corresponding supply gas path of the battery pack 20 may be opened. Then, the air compressor 200 of the gas supply system may extract gas from the inside of the battery compartment 10. Then, the gas may be dried by the polymer membrane air dryer 300, pass through the open switch valve 400 and reach the air inlet of the battery pack 20 after pressure regulation by the pressure regulating valve 21 at the air inlet of the battery pack 20, thereby entering the battery pack 20. Finally, the gas may be discharged into the battery compartment 10 via the exhaust valve 22 at the air outlet of the battery pack 20. Therefore, in the gas supply system according to the prior art, the temperature and pressure of the gas supplied to the battery pack cannot be accurately controlled or adjusted, and only the input pressure of the gas can be roughly controlled. In addition, the polymer membrane air dryer 300 also needs regular maintenance, and the air compressor 200 also needs continuous tooling, which adversely affects the service life of the system.

[0035] To this end, the present disclosure proposes a gas supply system for supplying gas to a battery pack in a battery compartment. The gas supply system is capable of supplying gas with substantially constant humidity, temperature, and pressure to the battery pack. Therefore, on the one hand, the gas supply system is capable of supplying low-temperature dry gas to the battery pack, thereby avoiding the formation of condensed water inside the battery pack. On the other hand, the gas provided by the gas supply system can be supplied to the battery pack with adjustable pressure and temperature, thereby not only regulating the temperature of the battery pack, especially cooling it during charging, but also preventing the battery pack from bulging due to excessive internal and external pressure differences.

[0036] The gas supply system disclosed in the embodiment of the present application can be used for any battery pack placed in a battery compartment. It can be used not only to dehumidify the battery pack but also to cool the battery pack.

[0037] For the convenience of description, the following embodiments are described by taking a gas supply system according to an embodiment of the present application as an example.

[0038] Please refer to Figure 2 , Figure 2 1 is an exemplary schematic diagram of a gas supply system for supplying gas to a battery pack 20 in a battery compartment 10 according to some embodiments of the present application. As in the prior art, any number of, for example, 24 battery packs 20 may be connected to the battery compartment 10, and the battery packs 20 may be placed on a battery rack, for example. Each battery pack 20 has an air inlet and an air outlet, a pressure regulating valve 21 may be provided at the air inlet, and an exhaust valve 22 may be provided at the air outlet.

[0039] According to some embodiments of the present application, a gas supply system is provided for supplying gas to a battery pack 20 in a battery compartment 10. The gas supply system may include: a gas supply circuit 100 for supplying gas from the battery compartment 10 where the battery pack 20 is located to the battery pack 20, and a booster device 200, a cooling and dehumidifying unit located downstream of the booster device 200, a decompression device 700 located downstream of the cooling and dehumidifying unit, and a switch valve 400 located downstream of the decompression device 700, which are sequentially arranged in the gas supply circuit 100 along the gas flow direction.

[0040] The boosting device 200 may be configured to convert the gas in the initial state from the battery compartment 10 into the gas in the first state. Thus, in particular, the temperature and pressure of the gas in the first state may be higher than the temperature and pressure of the gas in the initial state. In this embodiment, the gas in the initial state may be, for example, a gas at atmospheric pressure and room temperature, and the gas in the first state may be, for example, a high-temperature and high-pressure gas at 85°C and 10 bar.

[0041] The cooling and dehumidifying unit may be configured to convert a gas in a first state, for example, at a high temperature and high pressure, into a gas in a second state. Thus, in particular, the temperature of the gas in the second state may be lower than the temperature of the gas in the first state. Thus, by using the cooling and dehumidifying unit, when the temperature drops below the dew point, water vapor in the gas may condense into liquid water, so that excess water vapor in the gas may precipitate. Therefore, by using the cooling and dehumidifying unit, not only the temperature of the gas is reduced, but also the dehumidification of the gas is achieved.

[0042] The decompression device 700 may be configured to convert the gas in the second state into the gas in the third state. Here, the pressure of the gas in the third state particularly meets the demand of the battery pack 10 for the supply of gas. Therefore, in particular, the pressure of the gas in the third state may be lower than the pressure of the gas in the second state and may be higher than the pressure of the gas in the initial state, and the temperature and humidity of the gas in the third state may be lower than the temperature and humidity of the gas in the initial state. In this embodiment, the gas in the third state may be, for example, a gas having a temperature of less than 10°C, a relative humidity of less than 15%, and a pressure in the range of 50 to 80 kPa. In addition, during the process of decompression, the temperature and relative humidity of the gas in the second state may be further reduced to meet the temperature and humidity requirements of the battery pack.

[0043] Therefore, by arranging the boosting device, the cooling and dehumidifying unit, and the pressure reducing device in the gas supply path, the gas supply system according to the present invention can supply low-temperature dry gas to the battery pack, thereby avoiding the generation of condensed water inside the battery pack, and at the same time can also play an auxiliary cooling role for the battery pack.

[0044] According to some embodiments of the present application, optionally, the gas supply system may also include a control system, which may include a first detection device 40 arranged between the pressure reducing device 700 and the switch valve 400, and the control system may control the switch valve 400 and / or the cooling and dehumidification unit and / or the pressure reducing device 700 based on the state of the gas detected by the first detection device 40.

[0045] Here, the state of the gas detected by the first detection device 40 is the third state of the gas, that is, the state of the gas supplied to the battery pack 10. The control system can selectively open the switch valve 400 based on the state of the gas to supply the gas to the battery pack 20, or close the switch valve 400 and adjust the cooling and dehumidification unit and / or the decompression device 700. Therefore, the control system can control the opening or closing of the switch valve 400 and adjust the cooling and dehumidification unit and / or the decompression device accordingly according to the state of the gas. That is, when the state of the gas treated by the gas supply system according to the present disclosure meets the conditions required by the voltage pack 20, the control system can open the switch valve 400 to allow the gas to be supplied to the battery pack 20. When the state of the treated gas does not meet the conditions required by the voltage pack, the control system can close the switch valve 400 and control the cooling and dehumidification unit and / or the decompression device 700 to adjust the state of the treated gas.

[0046] Here, the control system may, as usual, for example comprise a control device and a drive device. The control device may be implemented as any type of computing device, computing circuit or any type of processor or processing circuit capable of executing a sequence of instructions stored in a memory. The control device may include multiple processors and / or a multi-core central processing unit (CPU) and may include any type of processor, such as a microprocessor, a digital signal processor, a microcontroller, etc. The control device may also include a memory to store data and / or algorithms to execute a sequence of instructions. The control device may also be implemented as a computer program product or a software product.

[0047] Therefore, the gas supply system according to the present disclosure can control the switch valve and / or the cooling and dehumidifying unit and / or the pressure reducing device according to the state of the gas, so that it can controllably or adjustably supply dry gas to the battery pack. That is, the dry gas provided by the gas supply system according to the present disclosure can be precisely controllably or adjustably supplied to the battery pack.

[0048] According to some embodiments of the present application, optionally, the first detection device 40 may include a first pressure sensor, a first temperature sensor and a humidity sensor, so that the pressure, temperature and humidity of the gas are detected as the state of the gas. Therefore, the control system can monitor and adjust the humidity, pressure and temperature of the supplied dry gas, so that the dry gas can be supplied to the battery pack with adjustable humidity, temperature and pressure. Therefore, the temperature of the dry gas supplied to the battery pack can be controlled to help regulate the temperature of the battery pack (especially cooling during charging), and the pressure of the dry gas supplied to the battery pack can be controlled to prevent the battery pack from bulging due to excessive internal and external pressure differences. Therefore, by using the gas supply system according to the present disclosure, while preventing the generation of condensed water, the battery pack can be temperature regulated and the battery pack can be prevented from bulging, thereby ensuring the performance and life of the battery.

[0049] According to some embodiments of the present application, optionally, the control system may also include a second detection device 50 arranged between the pressure reducing device 700 and the cooling and dehumidification unit and a three-way valve 60 arranged between the second detection device 50 and the pressure reducing device 700, and the control system controls the three-way valve 60 and / or the cooling and dehumidification unit according to the state of the gas detected by the second detection device 50.

[0050] Here, the state of the gas detected by the second detection device 50 is the second state of the gas, and whether the gas meets the preliminary requirements can be determined based on the state of the gas. When the gas meets the preliminary requirements, the control system can use the three-way valve to allow the gas to continue to flow to the battery pack. When the gas does not meet the preliminary requirements, the control system can use the three-way valve to discharge the gas and adjust the cooling and dehumidification unit accordingly. This is particularly applicable to the initial stage when the gas supply system is turned on, in which the booster and / or the cooling and dehumidification unit may have difficulty in quickly allowing the gas to meet the preliminary requirements.

[0051] According to some embodiments of the present application, optionally, the second detection device 50 may include a second pressure sensor and a second temperature sensor, so as to detect the pressure and temperature of the gas as the state of the gas.

[0052] According to some embodiments of the present application, optionally, the control system may further include a flow meter 70 disposed between the pressure reducing device 700 and the switch valve 400, and the control system may control the flow meter 70 according to the number of battery packs 20 connected to the battery compartment 10. Thus, in the gas supply system according to the present disclosure, real-time monitoring of the flow rate of the supplied dry gas can be achieved, and the size of the gas flow rate can be adjusted according to the number of battery packs.

[0053] According to some embodiments of the present application, optionally, the boosting device 200 may be configured as an air compressor, and the decompression device 700 may be configured as an electronic decompression valve, thereby making it possible to simply implement the boosting device 200 and the decompression device 700 .

[0054] According to some embodiments of the present application, optionally, the cooling and dehumidification unit may include a primary air cooling device 320 and a secondary liquid cooling device 310 , and the primary air cooling device 320 may be arranged between the boosting device 200 and the secondary liquid cooling device 310 .

[0055] The primary air cooling device 320 can be configured as an air-to-air cooler. It is a heat dissipation device that uses air as a cooling medium, and it can reduce the temperature of the gas to be cooled by heat exchange between gases. Thus, the primary air cooling device 320 can, for example, use at least one blower 321 (two in this embodiment) to reduce the temperature of the high-pressure and high-temperature gas in the first state that has passed through the boosting device 200, for example, from 85°C to 50°C. At the same time, the precipitated condensed water can be precipitated at the bottom of the air-to-air cooler. In addition, a timed electronic switch valve can be connected to the downstream of the primary air cooling device 320, that is, the air-to-air cooler. Here, a certain time period can be set to open the timed electronic switch valve to discharge the condensed water using the internal high pressure.

[0056] The secondary liquid cooling device 310 can be configured as an evaporator. The heat exchange system (particularly the air conditioning system) in which the evaporator is located may include the evaporator, the compressor 311, the condenser 312, the filter 313 and the expansion valve 314. Thus, the heat exchange system can provide the evaporator with a cooling medium, for example, close to 0°C, so that the secondary liquid cooling device 310 can reduce the temperature of the gas from 50°C to below 10°C. In addition, a timed electronic switch valve 90 can also be connected to the downstream of the secondary liquid cooling device 310, that is, the evaporator. Here, a certain time period can also be set to open the timed electronic switch valve 90 to discharge the condensed water using the internal high pressure.

[0057] Thus, a two-stage cooling and dehumidifying unit can be simply realized, thereby realizing cooling and dehumidifying the high-pressure and high-temperature gas extremely effectively. In addition, in this regard, the control system can adjust the cooling and dehumidifying unit according to the pressure and temperature of the gas (for example, adjusting the speed of the compressor, the opening of the expansion valve, the speed of the blower, etc.) until the supplied gas meets the requirements.

[0058] According to some embodiments of the present application, optionally, a gas storage tank 500 may be arranged between the primary air cooling device 320 and the secondary liquid cooling device 310, and a pressure sensor 501 and a pressure safety valve 502 may be arranged in the gas storage tank 500. Thus, the saturated air of the primary air cooling device 320 that has passed through the cooling and dehumidification unit may be stored in the gas storage tank 500. The pressure sensor 501 may be configured to monitor the pressure state of the gas storage tank 500. For example, the upper limit of the pressure of the gas storage tank 500 may be set to 10 bar. When the pressure of the gas storage tank 500 reaches the upper limit, the control system may stop the booster device 200 from working. In addition, if the pressure sensor is abnormal or the booster device works abnormally, causing the pressure of the gas storage tank 500 to exceed 10 bar abnormally, the pressure safety valve 502 of the gas storage tank 500 may be used to automatically exhaust and release the pressure to the outside to maintain the pressure safety of the system. In addition, according to the system's requirements for gas, when the pressure of the gas storage tank 500 is reduced to, for example, 8 bar, the booster device 200 may restart working. In addition, a timed electronic switch valve 80 may also be connected downstream of the gas storage tank 500. Here, a certain time period may be set to open the timed electronic switch valve 80 to discharge the condensed water by utilizing the internal high pressure.

[0059] Thereby, the continuous operation of the boosting device 200 can be prevented, thereby extending the service life of the boosting device 200, especially the air compressor.

[0060] According to some embodiments of the present application, optionally, a gas-liquid separator 600 may be arranged between the cooling and dehumidifying unit and the pressure reducing device 700. The gas-liquid separator 600 may precipitate moisture, for example, by adsorption. A drain pipe may be connected downstream of the gas-liquid separator 600, and the gas-liquid separator 600 may be automatically discharged from the discharge port through the discharge pipe according to its water level. Thus, the gas may be further separated from the water vapor through the gas-liquid separator 600. This is particularly suitable for situations where the gas flow rate is high, because in this case the gas may still carry out a portion of water vapor after passing through the cooling and dehumidifying unit, and this portion of water vapor may be precipitated through the gas-liquid separator 600.

[0061] According to some embodiments of the present application, optionally, the battery pack is a battery pack for commercial vehicles, especially heavy trucks. Battery packs for commercial vehicles are generally constructed with slender cylindrical high cells. Therefore, a cold plate is required to supply a cooling medium with a lower temperature to the battery packs for commercial vehicles, especially heavy trucks, so that the battery packs for commercial vehicles, especially heavy trucks, are more likely to form condensed water inside. Therefore, the gas supply system according to the present disclosure is particularly suitable for supplying gas to battery packs for commercial vehicles, especially heavy trucks.

[0062] According to some embodiments of the present application, the present application also provides a battery swap station, which includes a battery compartment 10 and a gas supply system according to the present disclosure as described above, wherein the gas supply system is capable of supplying gas to the battery pack 20 in the battery compartment 10.

[0063] According to some embodiments of the present application, see Figure 2The present application provides a gas supply system for supplying gas to a battery pack 20 in a battery compartment 10, which includes a gas supply circuit 100 for supplying gas from the inside of the battery compartment 10 where the battery pack 20 is located to the battery pack 20, and a booster device 200, a cooling and dehumidifying unit located downstream of the booster device 200, a decompression device 700 located downstream of the cooling and dehumidifying unit, and a switch valve 400 located downstream of the decompression device 700, which are sequentially arranged in the gas supply circuit 100 along the gas flow direction. The cooling and dehumidifying unit includes a primary air cooling device 320 and a secondary liquid cooling device 310, the primary air cooling device 320 is arranged between the booster device 200 and the secondary liquid cooling device 310, the primary air cooling device 320 is configured as an air-to-air cooler and the secondary liquid cooling device 310 is configured as an evaporator; a gas storage tank 500 is arranged between the primary air cooling device 320 and the secondary liquid cooling device 310, and a gas-liquid separator 600 is arranged between the cooling and dehumidifying unit and the decompression device 700. The gas supply system also includes a control system, the control system includes a first detection device 40 arranged between the pressure reducing device 700 and the switch valve 400, and the control system controls the switch valve 400 and / or the cooling and dehumidifying unit and / or the pressure reducing device 700 based on the state of the gas detected by the first detection device 40, wherein the first detection device 40 includes a first pressure sensor, a first temperature sensor and a humidity sensor. The control system also includes a second detection device 50 arranged between the pressure reducing device 700 and the cooling and dehumidifying unit and a three-way valve 60 arranged between the second detection device 50 and the pressure reducing device 700, and the control system controls the three-way valve 60 and / or the cooling and dehumidifying unit according to the state of the gas detected by the second detection device 50, wherein the second detection device 50 includes a second pressure sensor and a second temperature sensor. The control system also includes a flow meter 70 arranged between the pressure reducing device 700 and the switch valve 400, and the control system controls the flow meter 70 according to the number of battery packs 20 connected in the battery compartment 10. Therefore, the cooling and dehumidification unit according to the present disclosure realizes two-stage cooling and dehumidification, while the cooling and dehumidification unit and the gas-liquid separator 600 realize three-stage dehumidification. In addition, according to the present disclosure, the gas supplied by the air supply system may have, for example, a temperature of less than 10°C, a relative humidity of less than 15%, and a pressure in the range of 50~80kpa, and the low-temperature dry air may enter the battery pack under a certain air flow rate (for example, 4~10L / min). In this way, not only the battery pack can be dried, but also the battery pack can be cooled. In addition, since the air intake of the air supply system comes from the charging battery compartment, the dry gas supplied by the air supply system passes through the inside of the battery and is discharged to the battery compartment after reducing the air humidity in the battery, so it can assist in reducing the air humidity in the battery compartment.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A gas supply system for supplying gas to a battery pack (20) in a battery compartment (10), characterized in that: The gas supply system comprises: a gas supply path (100) for supplying gas from a battery compartment (10) where a battery pack (20) is located to the battery pack (20), and a booster device (200) arranged in sequence in the gas supply path (100) along a gas flow direction, a cooling and dehumidifying unit located downstream of the booster device (200), a decompression device (700) located downstream of the cooling and dehumidifying unit, and a switch valve (400) located downstream of the decompression device (700).

2. The gas supply system according to claim 1, characterized in that The gas supply system further comprises a control system, the control system comprising a first detection device (40) arranged between the pressure reducing device (700) and the switch valve (400), and the control system controls the switch valve (400) and / or the cooling and dehumidifying unit and / or the pressure reducing device (700) based on the state of the gas detected by the first detection device (40).

3. The gas supply system according to claim 2, characterized in that: The first detection device (40) comprises a first pressure sensor, a first temperature sensor and a humidity sensor.

4. The gas supply system according to claim 2, characterized in that: The control system further comprises a second detection device (50) arranged between the pressure reducing device (700) and the cooling and dehumidifying unit, and a three-way valve (60) arranged between the second detection device (50) and the pressure reducing device (700), and the control system controls the three-way valve (60) and / or the cooling and dehumidifying unit according to the state of the gas detected by the second detection device (50).

5. The gas supply system according to claim 4, characterized in that The second detection device (50) comprises a second pressure sensor and a second temperature sensor.

6. The gas supply system according to claim 2, characterized in that: The control system further comprises a flow meter (70) arranged between the pressure reducing device (700) and the switch valve (400), and the control system controls the flow meter (70) according to the number of battery packs (20) connected in the battery compartment (10).

7. The gas supply system according to claim 1, characterized in that: The pressure increasing device (200) is configured as an air compressor, and / or the pressure reducing device (700) is configured as an electronic pressure reducing valve.

8. The gas supply system according to claim 1, characterized in that: The cooling and dehumidifying unit comprises a primary air cooling device (320) and a secondary liquid cooling device (310); the primary air cooling device (320) is arranged between the boosting device (200) and the secondary liquid cooling device (310); the primary air cooling device (320) is configured as an air-to-air cooler and the secondary liquid cooling device (310) is configured as an evaporator.

9. The gas supply system according to claim 8, characterized in that An air storage tank (500) is arranged between the primary air cooling device (320) and the secondary liquid cooling device (310), and a pressure sensor (501) and a pressure safety valve (502) are arranged inside the air storage tank (500).

10. The gas supply system according to claim 1, characterized in that: A gas-liquid separator (600) is arranged between the cooling and dehumidifying unit and the pressure reducing device (700).

11. The gas supply system according to any one of claims 1 to 10, characterized in that: The battery pack (20) is a battery pack for a commercial vehicle.

12. A battery swap station, characterized in that: The battery swap station comprises a battery compartment (10) and a gas supply system according to any one of claims 1 to 11, wherein the gas supply system is capable of supplying gas to a battery pack (20) in the battery compartment (10).

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