Battery pack and vehicle

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery pack and a vehicle, the battery pack comprises a shell, a gas dehumidifier and a three-way valve, if the humidity of blown gas meets the requirement, the three-way valve can blow dehumidified gas into a battery cell containing cavity through a gas inlet hole; and if the humidity of the blown gas does not meet the requirement, the three-way valve can guide the dehumidified gas to flow back into the gas dehumidifier for secondary dehumidification treatment, so that the humidity of the gas blown into the shell of the battery pack is ensured to meet the requirement. The low-humidity gas is continuously blown into the battery cell accommodating cavity through the air inlet hole, so that the air pressure in the battery cell accommodating cavity is always greater than the external air pressure of the shell, the air with relatively high humidity outside the shell is prevented from flowing into the battery cell accommodating cavity, and the condensation risk in the battery pack is further greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery pack and a vehicle. Background Art

[0002] Direct cooling technology is used in battery thermal management systems to meet the cooling needs inside the battery pack. During the direct cooling process, the temperature at the inlet and throttling point of the liquid cooling plate is often very low. Low temperature can easily cause condensation in the battery pack, which is filled with battery cells and a large number of electrical components. Battery cells and electrical components are sensitive to humidity. When the humidity inside the battery pack is too high or condensation occurs inside the battery pack, it can easily cause short circuits or corrosion in the battery pack. In order for the battery pack to work safely, the humidity inside the battery pack needs to be controlled within a reasonable range.

[0003] Usually, the water vapor in the air inside the battery pack is condensed into liquid water, and the liquid water is stored in a specific container. When the liquid water in the specific container reaches a certain level, the liquid water in the specific container is discharged through a pump or capillary. However, the vehicle may be bumpy during driving, and the liquid water condensed by the traditional dehumidification method is likely to leak into the battery pack shell, which increases the risk of short circuit.

[0004] Gradually, the hot and humid air in the battery pack shell is introduced into the gas pipeline outside the shell through the exhaust fan and pipeline. The water temperature of the water cooling unit is relatively low when the water cooling unit is working, so that the water vapor in the gas is condensed to the surface of the cooling water pipe of the water cooling unit. The treated dry cold air is then returned to the battery pack shell to achieve the purpose of dehumidification and prevent condensation. There is no need to condense the water vapor in the air in the battery pack into liquid water. However, the humidity of the treated dry air may not meet the requirements. Therefore, how to ensure that the humidity of the gas blown into the battery pack shell meets the requirements has become an urgent problem to be solved by technicians in this field. Utility Model Content

[0005] The utility model provides a battery pack and a vehicle, which are used to solve the problem that the humidity of the processed dry air may not meet the requirements.

[0006] The utility model provides a battery pack, comprising:

[0007] The shell has a battery cell accommodating cavity formed therein; the shell is provided with an air inlet and an air outlet respectively connected to the battery cell accommodating cavity;

[0008] Gas dehumidifier, which can dehumidify the gas;

[0009] A three-way valve, the inlet of which is connected to the outlet of the gas dehumidifier, one of the outlets is connected to the battery cell accommodating chamber through the air inlet hole, and the other outlet is connected to the inlet of the gas dehumidifier;

[0010] The gas dehumidifier can blow dehumidified gas into the three-way valve; the three-way valve can blow dehumidified gas into the battery cell accommodating cavity through the air inlet hole or guide the dehumidified gas to flow back into the gas dehumidifier.

[0011] In some embodiments, it also includes:

[0012] A heat exchanger, the inlet of which is connected to the outlet of the gas dehumidifier, for exchanging heat with the dehumidified gas, and the outlet of which is connected to the inlet of the three-way valve;

[0013] And / or, the filter, the outlet of which is communicated with the inlet of the gas dehumidifier, is used to filter the gas.

[0014] In some embodiments, a first return pipe, a second return pipe and a collecting pipe are provided in the battery cell accommodating cavity; the first return pipe and the second return pipe are arranged in parallel on the upper and lower sides, left and right sides or front and back sides of the battery cell accommodating cavity; the ends of the first return pipe and the second return pipe away from the air inlet are both gas reflux inlets; the collecting pipe is arranged on the side of the battery cell accommodating cavity close to the air inlet or on the adjacent side of the side of the battery cell accommodating cavity close to the air inlet; the two ends of the collecting pipe are respectively connected with the end of the first return pipe close to the air inlet and the end of the second return pipe close to the air inlet, and the middle part is connected with the inlet of the gas dehumidifier; the first return pipe, the second return pipe and the collecting pipe are used to guide the gas in the battery cell accommodating cavity to flow back into the gas dehumidifier.

[0015] In some embodiments, it also includes:

[0016] The induced draft fan has an inlet which is respectively connected with the middle of the collecting pipe and the other outlet of the three-way valve, and an outlet which is connected with the inlet of the gas dehumidifier.

[0017] In some of the embodiments, a one-way valve or an explosion-proof valve is installed in the exhaust hole.

[0018] In some embodiments, the air inlet and the air outlet are respectively disposed on opposite end surfaces of the shell;

[0019] And / or, there are multiple air inlet holes, at least one of which is connected to one of the outlets of the three-way valve;

[0020] And / or, there are multiple exhaust holes, and at least one exhaust hole is connected to the inlet of the gas dehumidifier through a one-way valve / explosion-proof valve.

[0021] In some embodiments, it also includes:

[0022] A first pressure sensor is installed on an inner wall of a side of the housing where the exhaust hole is provided;

[0023] And / or, the second pressure sensor is installed on an outer wall of the shell on one side where the exhaust hole is provided.

[0024] In some embodiments, it also includes:

[0025] Multiple temperature and humidity sensors; at least one temperature and humidity sensor is arranged in the air inlet; and / or, at least one temperature and humidity sensor is arranged on the outer surface of the inlet of the liquid cooling plate inside the shell of the battery pack; and / or, at least one temperature and humidity sensor is arranged on the outer surface of the throttling part of the liquid cooling plate inside the shell of the battery pack.

[0026] In some of these embodiments, the gas dehumidifier is disposed outside the housing;

[0027] And / or, the three-way valve is a solenoid valve.

[0028] On the other hand, the utility model also provides a vehicle, on which the battery pack provided by any of the above embodiments is installed.

[0029] The beneficial effects of the utility model are as follows: The battery pack of the utility model is provided with a shell, and a battery cell accommodating chamber is formed inside the shell. The battery cell accommodating chamber is used to accommodate battery cells and other electrical components. An air inlet hole connected to the battery cell accommodating chamber is provided at one end of the shell, and an exhaust hole connected to the battery cell accommodating chamber is provided at the opposite end. In this way, the gas with low humidity blown into the battery cell accommodating chamber can fully promote the internal gas of the battery cell accommodating chamber to flow. The gas dehumidifier is arranged outside the shell, and can dehumidify the gas that is about to flow into the battery cell accommodating chamber. If the humidity of the blown gas meets the requirements, the three-way valve can blow the dehumidified gas into the battery cell accommodating chamber through the air inlet hole; if the humidity of the blown gas does not meet the requirements, the three-way valve can guide the dehumidified gas to flow back to the gas dehumidifier for secondary dehumidification treatment, thereby ensuring that the humidity of the gas blown into the shell of the battery pack meets the requirements. Since low-humidity gas is continuously blown into the battery cell containing cavity through the air inlet hole, the air pressure in the battery cell containing cavity is always greater than the external air pressure of the shell, which prevents the relatively high humidity air outside the shell from flowing into the battery cell containing cavity, thereby greatly reducing the risk of condensation in the battery pack and the possibility of increased self-discharge caused by condensation, thereby ensuring the safety, stability and reliability of the battery pack during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the internal structure of some specific embodiments of a battery pack of the utility model;

[0031] Figure 2 yes Figure 1 A partial enlarged view of area A.

[0032] In the accompanying drawings, 110, shell; 111, air inlet; 112, exhaust hole; 120, gas dehumidifier; 130, filter; 140, heat exchanger; 151, first return pipe; 152, second return pipe; 153, collecting pipe; 160, induced draft fan. DETAILED DESCRIPTION

[0033] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] As mentioned in the background technology, a vehicle may experience bumps during driving, and the liquid water condensed by traditional dehumidification methods is likely to leak into the battery pack shell, which in turn increases the risk of short circuit.

[0035] To solve the above problems, refer to Figure 1 and Figure 2The utility model provides a battery pack, including a shell 110, a gas dehumidifier 120 and a three-way valve. A battery cell accommodating cavity is formed inside the shell 110. The battery cell accommodating cavity is used to accommodate battery cells and other electrical components. The shell 110 is provided with an air inlet 111 and an air outlet 112 respectively connected to the battery cell accommodating cavity. The gas dehumidifier 120 can dehumidify the gas that is about to flow into the battery cell accommodating cavity. The inlet of the three-way valve is connected to the outlet of the gas dehumidifier 120, one of which is connected to the battery cell accommodating cavity through the air inlet 111, and the other outlet is connected to the inlet of the gas dehumidifier 120. The gas dehumidifier 120 can blow the dehumidified gas into the three-way valve. If the humidity of the gas blown meets the requirements, the three-way valve can blow the dehumidified gas into the battery cell accommodating cavity through the air inlet 111; if the humidity of the gas blown does not meet the requirements, the three-way valve can guide the dehumidified gas to flow back to the gas dehumidifier 120 for secondary dehumidification treatment, thereby ensuring that the humidity of the gas blown into the shell of the battery pack meets the requirements. It should be noted that the humidity of the gas blown into the shell 110 should be less than the humidity of the existing air in the shell 110, and the lower the humidity of the gas blown into the shell 110, the better. The gas used can be air, which is more convenient to obtain, or it can be an inert gas that does not chemically react with components such as battery cells and does not corrode components such as battery cells, etc. Since low-humidity gas is continuously blown into the battery cell accommodating cavity through the air inlet hole 111, the air pressure in the battery cell accommodating cavity is always greater than the external air pressure of the shell 110, thereby preventing air with relatively high humidity outside the shell 110 from flowing into the battery cell accommodating cavity, thereby greatly reducing the risk of condensation in the battery pack and the possibility of increased self-discharge caused by condensation, thereby ensuring the safety, stability and reliability of the battery pack during operation.

[0036] It should be noted that the gas dehumidifier 120 is composed of a compressor, a heat exchanger, a fan, a water container, a casing, etc. The fan draws the gas with high humidity into the casing from the inlet of the casing, and passes through the heat exchanger. At this time, the water vapor in the gas condenses into liquid water, and then the gas with lower temperature and lower humidity is discharged from the casing through the outlet of the gas dehumidifier casing. The coolant of the battery pack cooling system can be used as the working medium of the heat exchanger of the gas dehumidifier 120. Of course, the gas dehumidifier 120 can also be a semiconductor refrigeration device. The cooling process will not affect the normal operation of the battery pack cooling system, reducing the difficulty of temperature control of the existing battery pack cooling system.

[0037] In some embodiments, the battery pack also includes a heat exchanger 130. The inlet of the heat exchanger 130 is connected to the outlet of the gas dehumidifier 120, and is used to exchange heat with the dehumidified gas, and cool or heat the gas to be flowed into the battery cell accommodating cavity. The outlet of the heat exchanger 130 is connected to the inlet of the three-way valve. In this way, the temperature of the gas to be flowed into the battery cell accommodating cavity is greater than or equal to the temperature of the existing air in the shell 110, and the humidity is less than the humidity of the existing air in the shell 110. However, the temperature of the gas flowing into the air inlet 111 should not be greater than 40°C, so that the temperature of the position prone to condensation can be made higher than the dew point temperature as much as possible without destroying the thermal management system of the battery pack, so that condensation does not occur at the position prone to condensation.

[0038] In some other embodiments, the battery pack further includes a filter 140. The outlet of the filter 140 is connected to the inlet of the gas dehumidifier 120, and the gas can be filtered before being dehumidified to remove impurities in the gas flow to ensure the cleanliness of the gas flowing into the battery cell receiving cavity.

[0039] In some other embodiments, the battery pack further includes a heat exchanger 130 and a filter 140. The outlet of the filter 140 is connected to the inlet of the gas dehumidifier 120, and can filter the gas before it is dehumidified to remove impurities in the air flow to ensure the cleanliness of the gas flowing into the battery cell accommodating chamber. The inlet of the heat exchanger 130 is connected to the outlet of the gas dehumidifier 120, and is used to exchange heat with the dehumidified gas, and cool or heat the gas to be flowed into the battery cell accommodating chamber. The outlet of the heat exchanger 130 is connected to the inlet of the three-way valve. In this way, the temperature of the gas to be flowed into the battery cell accommodating chamber is greater than or equal to the temperature of the existing air in the shell 110, and the humidity is less than the humidity of the existing air in the shell 110. However, the temperature of the gas flowing into the air inlet 111 should not be greater than 40°C, so that the temperature of the easy condensation position is as high as possible to be higher than the dew point temperature without destroying the thermal management system of the battery pack, so that condensation does not occur at the easy condensation position.

[0040] Preferably, the filter 140 comprises a housing provided with an air inlet and an air outlet, a filter element which can be placed in the housing and is composed of a filter medium having a plate-like structure folded into a zigzag shape, and a filter core of an annular sealing pad for sealing the clean air area, the housing has the same cross section as the filter core on the air inlet side, and a clamping device for fixing the filter core in place is arranged on the housing through a membrane hinge. The filter core of the filter 140 is made of the same material as the filter core of the air filter 140 used in the vehicle passenger compartment or the driving compartment, which reduces the secondary development cost and the later maintenance cost.

[0041] Preferably, the heat exchanger 130 is an air heat exchanger. Of course, the waste heat of the engine or motor of the vehicle power system, the heat of the thermal management system, or the direct use of electric heating wires to heat the gas that is about to flow into the battery cell housing cavity can also be used to reduce the complexity of the device.

[0042] Preferably, the gas dehumidifier 120, the filter 140 and the heat exchanger 130 can be integrated into a modular device to reduce the space occupied by the gas dehumidifier 120, the filter 140 and the heat exchanger 130, improve space utilization, and reduce the complexity of the pipeline layout.

[0043] Specifically, in the exemplary embodiment, a first return pipe 151, a second return pipe 152 and a collecting pipe 153 are provided in the battery cell accommodating chamber. The first return pipe 151 and the second return pipe 152 are arranged in parallel on the upper and lower sides, left and right sides or front and back sides of the battery cell accommodating chamber. The ends of the first return pipe 151 and the second return pipe 152 away from the air inlet 111 are both gas reflux inlets. The collecting pipe 153 is arranged on the side of the battery cell accommodating chamber close to the air inlet 111 or on the adjacent side of the side of the battery cell accommodating chamber close to the air inlet 111. The two ends of the collecting pipe 153 are respectively connected to the end of the first return pipe 151 close to the air inlet 111 and the end of the second return pipe 152 close to the air inlet 111, and the middle part is connected to the inlet of the gas dehumidifier 120.

[0044] It should be pointed out that when the first return pipe 151 and the second return pipe 152 are arranged in parallel on the upper and lower sides or the front and rear sides of the battery cell accommodating chamber, the collecting pipe 153 is arranged on the side of the battery cell accommodating chamber close to the air inlet hole 111 (the right side of the battery cell accommodating chamber). When the first return pipe 151 and the second return pipe 152 are arranged in parallel on the left and right sides of the battery cell accommodating chamber, the collecting pipe 153 is arranged on the adjacent side of the battery cell accommodating chamber close to the air inlet hole 111 (the bottom side of the battery cell accommodating chamber). The first return pipe 151, the second return pipe 152 and the collecting pipe 153 are used to guide the gas in the battery cell accommodating chamber to flow back to the gas dehumidifier for secondary utilization. Since the reflux gas is relatively clean, it is only necessary to dehumidify and heat the reflux gas.

[0045] Specifically, in the exemplary embodiment, the battery pack further includes an induced draft fan 160. The inlet of the induced draft fan 160 is respectively connected to the middle of the manifold and the other outlet of the three-way valve, and the outlet is connected to the inlet of the gas dehumidifier 120. The induced draft fan 160 provides power for the flow of the reflux gas. In order to ensure that the air pressure in the battery cell accommodating chamber is always greater than the external air pressure of the shell 110, the reflux air volume should be less than the blown air volume, thereby preventing the humid air outside the shell 110 from flowing into the battery cell accommodating chamber.

[0046] In some embodiments, a one-way valve is installed in the exhaust hole 112. The one-way valve can control the gas in the housing 110 to flow to the outside of the housing 110, and prevent the gas outside the housing 110 from flowing to the inside of the housing 110.

[0047] In other embodiments, an explosion-proof valve is installed in the exhaust hole 112. When thermal runaway occurs in the housing 110, the explosion-proof valve is forced to open to quickly release pressure inside the housing 110. At the same time, the explosion-proof valve can balance the pressure difference between the inside and outside of the housing 110 according to the external environmental pressure.

[0048] Preferably, the air inlet 111 and the air outlet 112 are respectively disposed on opposite end surfaces of the housing 110. In this way, the gas with low humidity blown into the battery cell receiving chamber can fully promote the flow of the internal gas of the battery cell receiving chamber.

[0049] And / or, there are multiple air inlet holes 111, and at least one air inlet hole is connected to one of the outlets of the three-way valve.

[0050] And / or, there are multiple exhaust holes 112, and at least one exhaust hole 112 is connected to the inlet of the gas dehumidifier 120 through a one-way valve / explosion-proof valve. When the explosion-proof valve is broken or the one-way valve is opened, the gas flowing out of the exhaust hole 112 can flow back to the gas dehumidifier 120 for dehumidification. The cleanliness of the gas discharged from the exhaust hole 112 is relatively high. It only needs to reduce the humidity of the gas to be re-injected into the battery cell accommodating cavity for continued use, which can reduce the filtering burden of the filter 140 and extend the service life of the filter 140. The gas flow field inside the housing 110 can be analyzed by numerical simulation and experiments, and the size, number, specific position distribution, etc. of the air inlet 111 and the exhaust hole 112 can be optimized according to actual conditions.

[0051] Of course, in order to reduce the filtering burden of the filter 140 of the battery pack and extend the service life of the filter 140, the gas dehumidifier 120 can also be connected to the outlet of the filter 140 of the air conditioner in the vehicle passenger compartment through a proportional valve.

[0052] In some embodiments, the battery pack further includes a first pressure sensor. The first pressure sensor is mounted on an inner wall of the housing 110 on one side where the vent hole 112 is provided, and is used to detect the air pressure value inside the battery cell accommodating cavity.

[0053] In some other embodiments, the battery pack further includes a second pressure sensor. The second pressure sensor is mounted on an outer wall of the housing 110 on one side where the exhaust hole 112 is provided, and is used to detect the air pressure value outside the battery cell accommodating cavity.

[0054] In some other embodiments, the battery pack further includes a first pressure sensor and a second pressure sensor. The first pressure sensor is mounted on an inner wall of the shell 110 on which the exhaust hole 112 is provided, and is used to detect the air pressure value inside the battery cell accommodating chamber. The second pressure sensor is mounted on an outer wall of the shell 110 on which the exhaust hole 112 is provided, and is used to detect the air pressure value outside the battery cell accommodating chamber. It should be noted that the first pressure sensor can be mounted on the inner wall of the explosion-proof valve, and the second pressure sensor can be mounted on the outer wall of the explosion-proof valve, to calculate the pressure difference between the inside and outside of the explosion-proof valve. The pressure difference between the inside and outside of the explosion-proof valve should be less than the pressure difference corresponding to the air permeability before the explosion of the explosion-proof valve.

[0055] Specifically, in the exemplary embodiment, the battery pack further includes a plurality of temperature and humidity sensors.

[0056] At least one temperature and humidity sensor is disposed in the air inlet hole 111 to detect the temperature and humidity of the gas that is about to flow into the battery cell accommodating cavity through the air inlet hole 111 .

[0057] And / or, at least one temperature and humidity sensor is arranged on the outer surface of the entrance of the liquid cooling plate inside the shell of the battery pack, maintains a certain distance from the entrance of the liquid cooling plate, has a certain measurement accuracy, and has a low signal transmission delay, and is used to detect the temperature and humidity at the entrance of the liquid cooling plate.

[0058] And / or, at least one temperature and humidity sensor is arranged on the outer surface of the throttling point of the liquid cooling plate inside the shell of the battery pack, maintains a certain distance from the throttling point of the liquid cooling plate, has a certain measurement accuracy, and has a low signal transmission delay, and is used to detect the temperature and humidity of the outer surface of the throttling point of the liquid cooling plate.

[0059] Preferably, the gas dehumidifier 120 is disposed outside the shell 110, and the entire dehumidification process occurs outside the shell 110. No liquid water appears in the shell 110, which greatly reduces the risk of short circuit in the shell of the battery pack.

[0060] And / or the three-way valve and the one-way valve are solenoid valves to improve the degree of automation.

[0061] Specifically, in the exemplary embodiment, the battery pack further includes a controller which is electrically connected to the gas dehumidifier 120, the heat exchanger 130, the filter 140, the induced draft fan 160, the three-way valve, the one-way valve, the first pressure sensor, the second pressure sensor, and each temperature and humidity detection sensor.

[0062] Reference Figure 1 and Figure 2 , the working principle of the battery pack is as follows:

[0063] The controller controls the filter 140, the gas dehumidifier 120 and the heat exchanger 130 to work, and filters, dehumidifies and heats the gas in turn. The temperature and humidity sensor located in the air inlet 111 is used to detect the temperature and humidity of the air flow flowing to the air inlet 111. When the humidity does not meet the standard, the gas flows back to the gas dehumidifier 120 through the three-way valve and the induced draft fan 160 to continue the dehumidification process; when the humidity meets the standard, the gas flows into the battery cell accommodating cavity through the air inlet 111. Figure 1 The direction of the arrow in the middle shows the direction of gas flow. The gas in the battery cell accommodating chamber flows into the collecting pipe 153 under the guidance of the first return pipe 151 or the second return pipe 152, and then flows back to the gas dehumidifier 120 through the induced draft fan 160 for dehumidification. The air pressure in the battery cell accommodating chamber is always greater than the external air pressure of the shell 110, which prevents the relatively high humidity outside the shell 110 from flowing into the battery cell accommodating chamber, thereby greatly reducing the risk of condensation in the battery pack and the possibility of increased self-discharge caused by condensation, thereby ensuring the safety, stability and reliability of the battery pack during operation. When the air pressure in the battery cell accommodating chamber is too high, the pressure can be released through the explosion-proof valve. On the whole, the battery pack can be linked with the vehicle's thermal management system, vehicle purification system, and vehicle power system to reduce the overall power consumption, and can also directly use the purification system, dehumidification system and air filtration system on the original vehicle to reduce investment costs.

[0064] The utility model also provides a vehicle, on which the battery pack provided by any of the above-mentioned specific embodiments is installed. If the humidity of the blown gas meets the requirements, the three-way valve can blow the dehumidified gas into the battery cell accommodating chamber through the air inlet 111; if the humidity of the blown gas does not meet the requirements, the three-way valve can guide the dehumidified gas to flow back to the gas dehumidifier 120 for secondary dehumidification treatment, thereby ensuring that the humidity of the gas blown into the shell of the battery pack meets the requirements. The entire dehumidification process occurs outside the shell 110 of the battery pack, and no liquid water will appear in the shell 110, which greatly reduces the risk of short circuit in the shell of the battery pack. Since low-humidity gas is continuously blown into the battery cell accommodating chamber through the air inlet 111, the air pressure in the battery cell accommodating chamber is always greater than the external air pressure of the shell 110, which prevents the relatively high humidity air outside the shell 110 from flowing into the battery cell accommodating chamber, thereby greatly reducing the risk of condensation in the battery pack and the possibility of increased self-discharge caused by condensation, thereby ensuring the safety, stability and reliability of the battery pack during operation.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 present invention.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "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 one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the present utility model, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0069] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A shell having a battery cell accommodating cavity formed therein; the shell is provided with an air inlet and an air outlet respectively connected to the battery cell accommodating cavity; Gas dehumidifier, which can dehumidify the gas; A three-way valve, the inlet of which is connected to the outlet of the gas dehumidifier, one of which is connected to the battery cell accommodating cavity through the air inlet hole, and the other outlet is connected to the inlet of the gas dehumidifier; The gas dehumidifier can blow dehumidified gas into the three-way valve; the three-way valve can blow dehumidified gas into the battery cell accommodating cavity through the air inlet hole or guide the dehumidified gas to flow back into the gas dehumidifier.

2. The battery pack according to claim 1, characterized in that: Also includes: A heat exchanger, the inlet of which is connected to the outlet of the gas dehumidifier, for exchanging heat with the dehumidified gas, and the outlet of which is connected to the inlet of the three-way valve; And / or, a filter, the outlet of which is communicated with the inlet of the gas dehumidifier, is used to filter the gas.

3. The battery pack according to claim 1, characterized in that: A first return pipe, a second return pipe and a collecting pipe are provided in the battery cell accommodating cavity; the first return pipe and the second return pipe are arranged in parallel on the upper and lower sides, left and right sides or front and back sides of the battery cell accommodating cavity; the ends of the first return pipe and the second return pipe away from the air inlet are both gas reflux inlets; the collecting pipe is arranged on the side of the battery cell accommodating cavity close to the air inlet or on the adjacent side of the side of the battery cell accommodating cavity close to the air inlet; the two ends of the collecting pipe are respectively connected with the end of the first return pipe close to the air inlet and the end of the second return pipe close to the air inlet, and the middle part is connected with the inlet of the gas dehumidifier; the first return pipe, the second return pipe and the collecting pipe are used to guide the gas in the battery cell accommodating cavity to flow back into the gas dehumidifier.

4. The battery pack according to claim 3, characterized in that: Also includes: The induced draft fan has an inlet that is respectively connected to the middle of the collecting pipe and the other outlet of the three-way valve, and an outlet that is connected to the inlet of the gas dehumidifier.

5. The battery pack according to any one of claims 1 to 4, characterized in that: A one-way valve or an explosion-proof valve is installed in the exhaust hole.

6. The battery pack according to claim 5, characterized in that: The air inlet and the air outlet are respectively arranged on opposite end surfaces of the shell; And / or, there are multiple air inlet holes, and at least one of the air inlet holes is connected to one of the outlets of the three-way valve; And / or, there are multiple exhaust holes, and at least one of the exhaust holes is connected to the inlet of the gas dehumidifier through the one-way valve / the explosion-proof valve.

7. The battery pack according to any one of claims 1 to 4, characterized in that: Also includes: A first pressure sensor is installed on an inner wall of the housing on one side of which the exhaust hole is provided; And / or, a second pressure sensor is installed on an outer wall of the housing on one side where the exhaust hole is provided.

8. The battery pack according to any one of claims 1 to 4, characterized in that: Also includes: A plurality of temperature and humidity sensors; at least one of the temperature and humidity sensors is disposed in the air inlet; and / or at least one of the temperature and humidity sensors is disposed at the inlet of the liquid cooling plate; And / or, at least one of the temperature and humidity sensors is arranged at a throttling point of the liquid cooling plate.

9. The battery pack according to any one of claims 1 to 4, characterized in that: The gas dehumidifier is arranged outside the housing; And / or, the three-way valve is a solenoid valve.

10. A vehicle, characterized in that: The vehicle is equipped with a battery pack according to any one of claims 1 to 9.

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