Valves, battery packs and mobile power supplies

Abstract

The present application provides a valve, a battery pack and a mobile power source, wherein the shell of the battery pack is provided with an opening, the valve is provided at the opening, and the valve includes a valve core and a float. The valve core has a first accommodating chamber, and the cavity wall of the first accommodating chamber has a first through hole connected to the opening. The float is movably arranged in the first accommodating chamber, and an air flow channel is formed between the outer wall of the float and the cavity wall of the first accommodating chamber, and the air flow channel connects the first through hole and the external environment. The float moves toward the first through hole under the drive of the water until the first through hole is blocked to cut off the air flow channel, so that the opening is isolated from the external environment. When the valve is in use, the interior of the battery pack can be connected to the outside world, so that the air pressure inside the battery pack and the outside world is balanced, thereby realizing thermal runaway protection of the battery pack. When water enters the first accommodating chamber, the float will block the first through hole, cut off the air flow channel, isolate the opening from the external environment, prevent water from entering the opening, and prevent water from entering the interior of the battery pack, thereby realizing the waterproof function.

Description

Technical Field

[0001] The present application relates to the field of mobile power supplies, and specifically to a valve, a battery pack, and a mobile power supply. Background Art

[0002] In recent years, portable power banks have been widely used in outdoor camping, emergency power backup and other scenarios. The demand for mobile power safety is also becoming stronger and stronger. The battery cells in existing mobile energy storage power supplies only rely on the power supply shell to achieve preliminary protection for the battery cells, and insufficient consideration is given to the waterproofing and thermal runaway protection of the battery cells. For example, if the shell is to be waterproof, it must be sealed, but the sealed shell cannot maintain the air pressure balance between the inside and outside of the battery pack, and it is difficult to quickly discharge the gas generated by the valve when the battery cell sprays the valve. On the contrary, if the shell is to be able to discharge the valve gas, the shell must be provided with an opening, but the shell with an opening is difficult to achieve waterproofing. It can be seen that the current related technologies cannot achieve waterproofing and thermal runaway protection at the same time. Utility Model Content

[0003] In view of this, the present application provides a valve, a battery pack and a mobile power supply that can simultaneously achieve waterproofing and thermal runaway protection.

[0004] In one embodiment of the present application, a valve is provided for use in a battery pack, wherein the outer shell of the battery pack is provided with an opening, and the valve is configured to be provided at the opening, and the valve includes a valve core and a float. The valve core has a first accommodating cavity, and the cavity wall of the first accommodating cavity has a first through hole, and the first through hole is connected to the opening. At least part of the float is movably disposed in the first accommodating cavity, and an airflow channel is formed between the outer wall of the float and the cavity wall of the first accommodating cavity, and the airflow channel connects the first through hole and the external environment, and the float is configured to move toward the first through hole under the drive of the water until the first through hole is blocked to cut off the connection between the airflow channel and the first through hole, thereby isolating the opening from the external environment.

[0005] When the valve provided by the present application is in use, since the opening is connected to the first through hole, the first through hole is connected to the air flow channel, and the air flow channel is connected to the external environment, the interior of the battery pack can be connected to the outside world, so that the air pressure inside the battery pack and the outside world is balanced, thereby realizing thermal runaway protection of the battery pack. When water enters the first accommodating chamber at night, the float will move toward the first through hole driven by the water until the water inflow into the first accommodating chamber reaches a certain level. The float will block the first through hole and cut off the air flow channel to isolate the opening from the external environment, thereby preventing water from entering the opening, and then preventing water from entering the interior of the battery pack, thereby realizing a waterproof function. Therefore, the valve provided by the present application can take into account the effects of achieving better waterproofing and thermal runaway protection.

[0006] In some embodiments, the valve also includes an outer cover, the outer cover has a second accommodating chamber, the second accommodating chamber accommodates the float and at least part of the valve core, the second accommodating chamber is connected to the first accommodating chamber, the outer cover is provided with a second through hole, the second through hole connects the second accommodating chamber with the external environment, so that the airflow channel is connected to the external environment.

[0007] In some embodiments, the outer cover includes a cover body and a partition, the cover body is arranged on the valve core, a second accommodating chamber is formed between the cover body and the valve core, the partition is arranged on the cover body and located in the second accommodating chamber, the partition divides the second accommodating chamber into a first sub-chamber and a second sub-chamber, the first accommodating chamber is connected to the first sub-chamber, the second through hole is connected to the second sub-chamber, and the first sub-chamber and the second sub-chamber are connected at the top of the partition.

[0008] In some embodiments, the outer cover has two partitions, a first sub-chamber is formed between the two partitions, a second sub-chamber is formed on the side of each partition facing away from the first sub-chamber, and the outer cover has two second through holes, each second through hole is connected to a second sub-chamber.

[0009] In some embodiments, the valve core includes a main body and a plate body, the main body is arranged on one side of the plate body, the plate body is arranged on the outer shell of the battery pack and blocks the opening, the first accommodating cavity is arranged in the main body and passes through the bottom surface of the main body, and the first through hole passes through the side of the plate body facing away from the main body to connect the opening.

[0010] In some embodiments, a groove is provided on a side of the plate body facing away from the main body, the groove is connected to the opening, and the first through hole penetrates through the groove wall of the groove to be connected to the opening.

[0011] In some embodiments, the cavity wall of the first accommodating cavity has a plurality of first through holes, each of which connects the airflow channel and the opening, and the plurality of first through holes are arranged at intervals along the length direction of the float, and the distance between the two farthest first through holes is less than the length of the float, so that the float can block all the first through holes to cut off the airflow channel.

[0012] In some embodiments, the first accommodating chamber includes at least two stage chambers connected in sequence from top to bottom, the volumes of at least two stage chambers decrease in sequence from top to bottom, the float includes at least two stage floats, each stage chamber is provided with a corresponding stage float, and a stage air flow channel is formed between the outer wall of each stage float and the cavity wall of the stage chamber, the uppermost stage air flow channel is connected to the first through hole, and the lowermost stage air flow channel is connected to the external environment, and each stage float is configured to move toward the first through hole under the drive of water until the connection between two adjacent stage chambers or the first through hole is blocked to isolate the opening from the external environment.

[0013] In one embodiment of the present application, a battery pack is further provided, comprising a battery cell group, a shell and the valve in any of the above embodiments, wherein the battery cell group is disposed in the shell, the shell is provided with an opening, and the valve is provided in the opening.

[0014] In one embodiment of the present application, a mobile power source is further provided. The mobile power source includes an inverter and the above-mentioned battery pack, and the battery pack is electrically connected to the inverter.

[0015] When the battery pack and mobile power supply provided by the present application are in use, since the opening is connected to the first through hole, the first through hole is connected to the air flow channel, and the air flow channel is connected to the external environment, the interior of the battery pack can be connected to the outside world, so that the air pressure inside the battery pack and the outside world is balanced, thereby realizing thermal runaway protection of the battery pack. When water enters the first accommodating chamber at night, the float will move toward the first through hole driven by the water until the water inflow into the first accommodating chamber reaches a certain level. The float will block the first through hole and cut off the air flow channel to isolate the opening from the external environment, thereby preventing water from entering the opening, and then preventing water from entering the interior of the battery pack, thereby realizing a waterproof function. Therefore, the valve provided by the present application can take into account the effects of achieving better waterproofing and thermal runaway protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of a mobile power supply in one embodiment of the present application.

[0017] Figure 2 It is a three-dimensional diagram of a battery pack in one embodiment of the present application.

[0018] Figure 3 for Figure 2 A three-dimensional view of the middle valve.

[0019] Figure 4 for Figure 3 Cross-sectional view of the middle valve along lines I VI V.

[0020] Figure 5 for Figure 3 Sectional view of the middle valve along VV.

[0021] Figure 6 for Figure 2 Exploded view of the middle valve.

[0022] Figure 7 for Figure 6 Exploded view of the middle valve from another angle.

[0023] Figure 8 for Figure 6 Exploded view of the center float and valve core from the bottom perspective.

[0024] Fig. 9 for Figure 2 A perspective view of the middle valve from the bottom.

[0025] Fig.10 for Figure 2 A perspective view of the middle valve from the back.

[0026] Fig.11It is a cross-sectional view of a valve in another embodiment of the present application.

[0027] Main component symbols

[0028] 100-valve 200-battery pack 201-housing

[0029] 202- opening 300- mobile power supply 301- protective shell

[0030] 10-valve core 11-first accommodating chamber 111-air flow channel

[0031] 112-stage cavity 1121-stage air flow channel 12-first through hole

[0032] 13-opening 14-main body 15-plate

[0033] 151-groove 20-float 21-level float

[0034] 30-outer cover 31-second accommodating chamber 311-first sub-chamber

[0035] 312- second sub-chamber 32- second through hole 33- cover body

[0036] 34-Partition. DETAILED DESCRIPTION

[0037] The technical solution of the present application will be described below in conjunction with the drawings in the implementation modes of the present application. Obviously, the described implementation modes are only part of the implementation modes of the present application, rather than all the implementation modes.

[0038] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0040] In recent years, portable power banks have been widely used in outdoor camping, emergency power backup and other scenarios. The demand for mobile power safety is also becoming stronger and stronger. The battery cells in existing mobile energy storage power supplies only rely on the power supply shell to achieve preliminary protection for the battery cells, and insufficient consideration is given to the waterproofing and thermal runaway protection of the battery cells. For example, if the shell is to be waterproof, it must be sealed, but the sealed shell cannot maintain the air pressure balance between the inside and outside of the battery pack, and it is difficult to quickly discharge the gas generated by the valve when the battery cell sprays the valve. On the contrary, if the shell is to be able to discharge the valve gas, the shell must be provided with an opening, but the shell with an opening is difficult to achieve waterproofing. It can be seen that the current related technologies cannot achieve waterproofing and thermal runaway protection at the same time.

[0041] In view of this, the present application provides a valve that can achieve both waterproofing and thermal runaway protection. The valve is applied to a battery pack, the outer shell of the battery pack is provided with an opening, the valve is configured to be arranged at the opening, and the valve includes a valve core and a float. The valve core has a first accommodating cavity, the cavity wall of the first accommodating cavity has a first through hole, and the first through hole is connected to the opening. At least part of the float is movably arranged in the first accommodating cavity, and an airflow channel is formed between the outer wall of the float and the cavity wall of the first accommodating cavity, the airflow channel connects the first through hole and the external environment, and the float is configured to move toward the first through hole under the drive of the water until the first through hole is blocked to cut off the connection between the airflow channel and the first through hole, so that the opening is isolated from the external environment.

[0042] When the valve provided by the present application is in use, since the opening is connected to the first through hole, the first through hole is connected to the air flow channel, and the air flow channel is connected to the external environment, the interior of the battery pack can be connected to the outside world, so that the air pressure inside the battery pack and the outside world is balanced, thereby realizing thermal runaway protection of the battery pack. When water enters the first accommodating chamber at night, the float will move toward the first through hole driven by the water until the water inflow into the first accommodating chamber reaches a certain level. The float will block the first through hole and cut off the air flow channel to isolate the opening from the external environment, thereby preventing water from entering the opening, and then preventing water from entering the interior of the battery pack, thereby realizing a waterproof function. Therefore, the valve provided by the present application can take into account the effects of achieving better waterproofing and thermal runaway protection.

[0043] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] like Figure 1 and Figure 2 As shown, in the embodiment of the present application, a valve 100, a battery pack 200 and a mobile power supply 300 are provided. The battery pack 200 includes the valve 100, and the mobile power supply 300 includes the battery pack 200. The battery pack 200 and the mobile power supply 300 simultaneously realize the functions of waterproofing and thermal runaway protection through the valve 100.

[0045] In some embodiments, Figure 2 As shown, the battery pack 200 further includes a housing 201 and a battery cell group (not shown), the battery cell group is arranged in the housing 201, the housing 201 is provided with an opening 202, the opening 202 is connected to the internal environment of the battery pack 200, and the valve 100 is arranged at the opening 202. The battery pack 200 can be sold or used independently as a separate product, such as a backup power supply or a household energy storage battery.

[0046] In some embodiments, Figure 1 As shown, the mobile power supply 300 also includes a protective shell 301 and an inverter (not shown), the inverter and the battery pack 200 are both arranged in the protective shell 301, the inverter is used for power conversion, the battery pack 200 is electrically connected to the inverter, the inverter can convert the DC power of the battery pack 200 into AC power for use by electrical appliances, and the inverter can also convert the AC power of the power grid into DC power to charge the battery pack 200. As an illustrative example, the mobile power supply 300 can be a portable power supply used in outdoor scenes or a home energy storage system for home energy storage, etc.; the electrical appliances can be air conditioners, refrigerators, other energy storage devices or other electrical appliances, etc.

[0047] In some embodiments, Figures 2 to 5 As shown, the valve 100 includes a valve core 10 and a float 20. The valve core 10 is disposed at the opening 202 of the battery pack 200. The valve core 10 has a first accommodating chamber 11. The first accommodating chamber 11 passes through one side of the valve core 10 to communicate with the external environment. The cavity wall of the first accommodating chamber 11 has a first through hole 12. One end of the first through hole 12 communicates with the first accommodating chamber 11 and the other end communicates with the opening 202, so that the first accommodating chamber 11 is connected with the opening 202. At least part of the float 20 is movably disposed in the first accommodating chamber 11. An airflow channel 111 is formed between the outer wall of the float 20 and the cavity wall of the first accommodating chamber 11. Since the airflow channel 111 is a part of the first accommodating chamber 11, the airflow channel 111 must also connect the first through hole 12 and the external environment. The density of the float 20 is relatively small, so that the float 20 can move toward the first through hole 12 driven by the water.

[0048] like Figure 2 and Figure 4 As shown, since the internal environment of the battery pack 200 is connected to the opening 202, the opening 202 is connected to the first through hole 12, the first through hole 12 is connected to the air flow channel 111, and the air flow channel 111 is connected to the external environment, the internal environment of the battery pack 200 is connected to the external environment, so that the air pressure inside the battery pack 200 and the outside is balanced, thereby realizing thermal runaway protection of the battery pack 200. For example, when the battery cell group sprays the valve, the high-pressure gas generated by the spray valve can be quickly discharged.

[0049] When the battery pack 200 is in a water environment, Figure 2 and Figure 5 As shown, for example, in an environment of falling into water or being rained on, water will enter the first accommodating chamber 11 from the side of the valve core 10 through which the first accommodating chamber 11 passes. At this time, the float 20 will move toward the first through hole 12 driven by the water until the water inflow into the first accommodating chamber 11 reaches a certain level. The float 20 will block the first through hole 12, thereby cutting off the connection between the airflow channel 111 and the first through hole 12, thereby isolating the opening 202 from the external environment, preventing water from entering the opening 202, and thereby preventing water from entering the interior of the battery pack 200, thereby achieving a waterproof function.

[0050] When the float 20 blocks the first through hole 12, if the air pressure inside the battery pack 200 increases and exceeds the driving force of the water on the float 20, the high-pressure gas inside the battery pack 200 can drive the float 20 to move away from the first through hole 12, thereby making the air flow channel 111 unobstructed to discharge the high-pressure gas, until the air pressure inside the battery pack 200 drops to below the driving force of the water on the float 20. Then, the float 20 will move toward the first through hole 12 driven by the water to block the first through hole 12 and cut off the air flow channel 111 to prevent the water from entering the opening 202.

[0051] In some embodiments, Figures 4 to 7 As shown, the valve 100 further includes an outer cover 30, the outer cover 30 having a second accommodating chamber 31, the second accommodating chamber 31 accommodating the float 20 and at least part of the valve core 10 to protect the valve core 10 and the float 20, the second accommodating chamber 31 communicating with the first accommodating chamber 11, and the outer cover 30 having a second through hole 32 communicating with the second accommodating chamber 31 and the external environment. Since the external environment communicates with the second through hole 32, the second through hole 32 communicates with the second accommodating chamber 31, the second accommodating chamber 31 communicates with the first accommodating chamber 11, and the first accommodating chamber 11 forms an airflow channel 111, thereby realizing that the airflow channel 111 communicates with the external environment.

[0052] Optionally, the first accommodating chamber 11 passes through the bottom surface of the valve core 10 to communicate with the external environment, and the first through hole 12 is provided on the top surface of the first accommodating chamber 11, and the water drives the float 20 to move by generating buoyancy. When the battery pack 200 is in a water environment, the water enters the second accommodating chamber 31 from the second through hole 32 and then enters the first accommodating chamber 11. As the first accommodating chamber 11 is filled with water, the float 20 will float up with the water until the water inflow into the first accommodating chamber 11 reaches a certain level, and the float 20, under the action of buoyancy, presses against the top surface of the first accommodating chamber 11, thereby blocking the first through hole 12.

[0053] Alternatively, in order to facilitate the assembly of the float 20, the first accommodating cavity 11 passes through the bottom surface of the valve core 10 to form an opening 13. Figure 8As shown, the area of ​​the opening 13 is larger than the cross-sectional area of ​​the float 20. When assembling the valve 100, the float 20 is installed into the first accommodating cavity 11 through the opening 13, and then the outer cover 30 is installed on the valve core 10. At this time, when the valve 100 is in use, when the float 20 is not affected by the buoyancy of the water, the float 20 will fall onto the cavity wall of the second accommodating cavity 31 by gravity, that is, the cavity wall of the second accommodating cavity 31 carries the float 20, a part of the float 20 is located in the first accommodating cavity 11, and the other part is located outside the first accommodating cavity 11, and the air flow channel 111 is formed between the inner wall of the first accommodating cavity 11 and the outer wall of the part of the float 20 located in the first accommodating cavity 11.

[0054] In some embodiments, Figure 2 and Figures 5 to 7 As shown, the outer cover 30 includes a cover body 33 and a partition 34. The cover body 33 is disposed on the valve core 10, and a second accommodating chamber 31 is formed between the cover body 33 and the valve core 10. The partition 34 is disposed on the cover body 33 and is located in the second accommodating chamber 31. The partition 34 divides the second accommodating chamber 31 into a first sub-chamber 311 and a second sub-chamber 312. The first sub-chamber 311 and the second sub-chamber 312 are connected at the top of the partition 34. The first accommodating chamber 11 is connected to the first sub-chamber 311, and the second through hole 32 is connected to the bottom of the second sub-chamber 312.

[0055] When water enters the second through hole 32, the water will first enter the first sub-chamber 311. At this time, no water will enter the second sub-chamber 312, so there will be no water in the first accommodating chamber 11, and the float 20 will not float up, thereby keeping the airflow channel 111 unobstructed, so that the high-pressure gas in the battery pack 200 can be discharged more smoothly; when the height of the water rises to exceed the height of the partition 34, the water will enter the second sub-chamber 312 and the first accommodating chamber 11, so that the float 20 floats up with the water. In summary, the role of the partition 34 in dividing the second accommodating chamber 31 into the first sub-chamber 311 and the second sub-chamber 312 is that when a small amount of water enters the second through hole 32, a small amount of water will be stored in the first sub-chamber 311 and will not enter the second sub-chamber 312 and the first accommodating chamber 11, thereby keeping the airflow channel 111 unobstructed.

[0056] In some embodiments, the outer cover 30 has two partitions 34, the first sub-cavity 311 is formed between the two partitions 34, and a second sub-cavity 312 is formed on the side of each partition 34 facing away from the first sub-cavity 311. The outer cover 30 is provided with two second through holes 32, and each second through hole 32 is connected to a second sub-cavity 312. The second sub-cavity 312 and the second through hole 32 are respectively provided on both sides of the first sub-cavity 311, so that the distribution of the second accommodating cavity 31 is more uniform, so that the pressure distribution of the gas is more uniform when the battery pack 200 is exhausted, and the buoyancy distribution of the water on the float 20 is also more uniform when the water enters the first sub-cavity 311 and the first accommodating cavity 11, so that the float 20 floats faster and more steadily.

[0057] In some embodiments, Figure 2 and Figures 5 to 8 As shown, the valve core 10 includes a main body 14 and a plate body 15, the main body 14 is arranged on one side of the plate body 15, the plate body 15 is arranged on the shell 201 of the battery pack 200 and blocks the opening 202, the first accommodating cavity 11 is arranged on the main body 14 and penetrates the bottom surface of the main body 14 to form an opening 13, and the first through hole 12 penetrates the side of the plate body 15 facing away from the main body 14 to communicate with the opening 202. The structure of the main body 14 and the plate body 15 of the valve core 10 can facilitate processing and production, and facilitate the installation of the valve core 10 to the battery pack 200.

[0058] In addition, the cover 33 is disposed on the plate 15 and covers the main body 14, the second accommodating chamber 31 is formed between the cover 33 and the plate 15, and the main body 14 is located in the first sub-chamber 311 of the second accommodating chamber 31, so that the first accommodating chamber 11 is connected to the first sub-chamber 311. The valve core 10 can also facilitate the assembly of the outer cover 30 and the valve core 10 through the structure of the main body 14 and the plate 15.

[0059] Optionally, combined Fig. 9 As shown, the second through hole 32 passes through the cover body 33 toward one side of the plate body 15, so that the surface of the plate body 15 forms a part of the hole wall of the second through hole 32, thereby reducing the area of ​​the second through hole 32 and preventing a large amount of water from flowing into the second through hole 32. It can be understood that in other embodiments, the second through hole 32 can be completely formed in the cover body 33.

[0060] In some embodiments, Figure 2 , Figure 5 , Figure 7 and Fig.10As shown, a groove 151 is provided on the side of the plate body 15 facing away from the main body 14, the groove 151 is connected to the opening 202, and the first through hole 12 passes through the groove wall of the groove 151 to connect to the opening 202. The groove 151 makes it unnecessary for the first through hole 12 to pass through the side of the plate body 15 facing away from the main body 14, and the first through hole 12 only needs to pass through the groove wall of the groove 151 to connect to the opening 202, thereby reducing the length of the first through hole 12, reducing the risk of clogging of the first through hole 12, and facilitating the processing of the first through hole 12.

[0061] In some embodiments, the cavity wall of the first accommodating cavity 11 has a plurality of first through holes 12 , each of which connects the airflow channel 111 and the opening 202 . The plurality of first through holes 12 can make the connection between the airflow channel 111 and the opening 202 smoother.

[0062] Optionally, multiple first through holes 12 are arranged at intervals along the length direction of the float 20, and the distance between the two farthest first through holes 12 is smaller than the length of the float 20, so that all the first through holes 12 can be blocked at the same time after the float 20 floats up to ensure that the airflow channel 111 is cut off.

[0063] Optionally, the float 20 is in a rectangular block shape, so that the top surface of the float 20 is a plane, and the cavity wall of the first accommodating cavity 11 on which the first through hole 12 is arranged is also a plane. When the float 20 floats up, the top surface of the float 20 fits against the cavity wall of the first accommodating cavity 11, and the area of ​​the top surface of the float 20 completely covers the area of ​​each first through hole 12, thereby improving the blocking effect to ensure that the airflow channel 111 is cut off.

[0064] In some embodiments, Figure 2 and Fig.11 As shown, the first accommodating chamber 11 includes at least two level chambers 112 connected sequentially from top to bottom, and the volumes of at least two level chambers 112 decrease sequentially from top to bottom. The float 20 includes at least two level floats 21, and each level chamber 112 is provided with a corresponding level float 21. The outer wall of each level float 21 forms a level airflow channel 1121 with the cavity wall of the level chamber 112 where it is located, and the level airflow channels 1121 of two adjacent layers are connected. The first through hole 12 is provided at the top of the uppermost level chamber 112, and the level airflow channel 1121 of the uppermost level is connected to the first through hole 12, and the level airflow channel 1121 of the lowermost level is connected to the second accommodating chamber 31 and thus connected to the external environment. Each level float 21 can move toward the first through hole 12 under the drive of the water until the connection between the two adjacent level chambers 112 is blocked or the first through hole 12 is blocked, so that the opening 202 is isolated from the external environment.

[0065] Optionally, there are two level cavities 112 and two level floats 21. When in use, when water enters the first accommodating chamber 11, the water will first enter the lower level cavity 112, so that the lower level float 21 floats with the water until the lower level float 21 blocks the connection between the two level cavities 112, thereby cutting off the lower level airflow channel 1121 to prevent water from entering the opening 202.

[0066] If the lower stage float 21 does not work and the lower stage air flow channel 1121 is not cut off, the water will enter the upper stage cavity 112. At this time, the upper stage float 21 will float up with the water until the upper stage float 21 blocks the first through hole 12, thereby cutting off the upper stage air flow channel 1121 to prevent the water from entering the opening 202.

[0067] Compared with only a single float 20 , the stage cavity 112 and the stage float 21 can improve reliability. When one stage float 21 fails, the stage air flow channel 1121 can still be cut off, thereby preventing water from entering the opening 202 .

[0068] Or, if Fig.11 As shown, when in use, when water enters the first accommodating chamber 11, if the speed of water inflow is too fast, the water will quickly enter the upper stage chamber 112 and the lower stage chamber 112, thereby causing the upper and lower stage floats 21 to float up and block the stage air flow channel 1121, wherein, since the lower stage float 21 will inevitably float up before the upper stage float 21, the lower stage air flow channel 1121 can be blocked first, thereby preventing a large amount of water from entering the upper stage chamber 112, that is, the lower stage chamber 112 and the stage float 21 can play a buffering role to prevent water from entering the opening 202 before the upper stage float 21 has blocked the upper stage air flow channel 1121.

[0069] However, when only a single float 20 is provided, if water quickly enters the first accommodating chamber 11, causing the speed at which water enters the opening 202 to be greater than the rising speed of the float 20, a certain amount of water will enter the opening 202 before the float 20 blocks the air flow channel 111. Therefore, compared with this, the stage chamber 112 and the stage float 21 can improve reliability and play a buffering effect when the water flow rate is faster, thereby preventing water from entering the opening 202.

[0070] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A valve, applied to a battery pack, wherein the housing of the battery pack is provided with an opening, and the valve is configured to be provided at the opening, characterized in that: The valve comprises: A valve core, the valve core having a first accommodating cavity, a cavity wall of the first accommodating cavity having a first through hole, and the first through hole is connected to the opening; A float, at least part of which is movably disposed in the first accommodating chamber, an air flow channel is formed between the outer wall of the float and the cavity wall of the first accommodating chamber, the air flow channel connects the first through hole and the external environment, and the float is configured to move toward the first through hole under the drive of water until the first through hole is blocked to cut off the connection between the air flow channel and the first through hole, so that the opening is isolated from the external environment.

2. The valve according to claim 1, characterized in that: The valve also includes an outer cover, which has a second accommodating chamber, which accommodates the float and at least part of the valve core, and the second accommodating chamber is connected to the first accommodating chamber. The outer cover is provided with a second through hole, and the second through hole connects the second accommodating chamber with the external environment, so that the airflow channel is connected to the external environment.

3. The valve according to claim 2, characterized in that: The outer cover includes a cover body and a partition, the cover body is arranged on the valve core, the second accommodating chamber is formed between the cover body and the valve core, the partition is arranged on the cover body and located in the second accommodating chamber, the partition divides the second accommodating chamber into a first sub-chamber and a second sub-chamber, the first accommodating chamber is connected to the first sub-chamber, the second through hole is connected to the second sub-chamber, and the first sub-chamber and the second sub-chamber are connected at the top of the partition.

4. The valve according to claim 3, characterized in that: The outer cover has two partitions, the first sub-cavity is formed between the two partitions, a second sub-cavity is formed on the side of each partition facing away from the first sub-cavity, and the outer cover is provided with two second through holes, each of the second through holes is connected to a second sub-cavity.

5. The valve according to any one of claims 1 to 4, characterized in that: The valve core includes a main body and a plate body, the main body is arranged on one side of the plate body, the plate body is arranged on the outer shell of the battery pack and blocks the opening, the first accommodating cavity is arranged in the main body and passes through the bottom surface of the main body, and the first through hole passes through the side of the plate body facing away from the main body to connect with the opening.

6. The valve according to claim 5, characterized in that: A groove is provided on one side of the plate body facing away from the main body, the groove is connected to the opening, and the first through hole penetrates through the groove wall of the groove to be connected to the opening.

7. The valve according to any one of claims 1 to 4, characterized in that: The cavity wall of the first accommodating cavity has a plurality of first through holes, each of which is connected to the airflow channel and the opening, and the plurality of first through holes are arranged at intervals along the length direction of the float, and the distance between the two first through holes that are farthest apart is smaller than the length of the float, so that the float can block all the first through holes to cut off the airflow channel.

8. The valve according to any one of claims 1 to 4, characterized in that: The first accommodating chamber includes at least two stage chambers connected in sequence from top to bottom, and the volumes of at least two stage chambers decrease in sequence from top to bottom. The float includes at least two stage floats, and each stage chamber has a corresponding stage float. A stage air flow channel is formed between the outer wall of each stage float and the cavity wall of the stage chamber. The uppermost stage air flow channel is connected to the first through hole, and the lowermost stage air flow channel is connected to the external environment. Each stage float is configured to move toward the first through hole under the drive of water until the connection between two adjacent stage chambers or the first through hole is blocked, so that the opening is isolated from the external environment.

9. A battery pack, characterized in that: The battery pack comprises a battery cell group, a shell and a valve according to any one of claims 1 to 8, wherein the battery cell group is arranged in the shell, the shell is provided with an opening, and the valve is arranged at the opening.

10. A mobile power source, characterized in that: The mobile power source includes an inverter and a battery pack as claimed in claim 9, and the battery pack is electrically connected to the inverter.

Images