Battery pack and powered device
By integrating sensors into the exhaust valve to detect abnormal states of the battery pack, the problem of low sensor sensitivity is solved, enabling timely capture of abnormal states of the battery pack and reducing the risk of thermal runaway.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2026-04-17
- Publication Date
- 2026-07-21
AI Technical Summary
The sensors in the existing battery pack have low sensitivity in detecting whether the battery pack is experiencing thermal runaway, which makes it impossible to capture abnormal states in time. This may lead to the exhaust valve not opening properly, increasing the risk of thermal runaway heating and cracking of the enclosure.
By integrating sensors onto the exhaust valve, abnormal conditions such as changes in air pressure, temperature, and smoke can be detected, and warning messages can be triggered in a timely manner to improve detection sensitivity.
It improves the detection sensitivity of abnormal battery pack conditions, reduces the risk of thermal runaway heating and housing cracking caused by the exhaust valve not opening properly, and ensures that the sensor can capture abnormal conditions in a timely manner.
Smart Images
Figure CN122436588A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of batteries, and in particular to a battery pack and an electrical device having the battery pack. Background Technology
[0002] Battery packs equipped with vent valves are known. Battery packs are widely used in systems such as electric vehicles and energy storage. Sensors are installed inside the battery pack to detect abnormalities, specifically thermal runaway. These sensors trigger appropriate alarm signals when an abnormal state is detected. However, there is a problem with the sensors installed inside the battery pack being insensitive in acquiring data about the battery pack's condition. Summary of the Invention
[0003] In view of this, the present disclosure provides a battery pack to at least solve the problem of low sensitivity of battery pack sensors in detecting thermal runaway, or at least improve the sensitivity of battery pack sensors in detecting thermal runaway.
[0004] The battery pack disclosed herein includes a battery pack, a housing, an exhaust valve, and sensors. The battery pack is housed within the housing.
[0005] An exhaust valve is located on at least one side wall of the enclosure. In the event of thermal runaway of the battery pack, the exhaust valve forms an exhaust channel for the gas inside the enclosure to escape. A sensor is integrated into the exhaust valve to detect whether thermal runaway has occurred in the battery pack and to trigger an alarm message when thermal runaway is detected.
[0006] In this embodiment, the sensor is integrated onto the vent valve. Abnormal states triggered by thermal runaway of the battery pack can be promptly detected by the sensor, reducing the risk of the vent valve opening and depressurizing before the sensor detects the obvious abnormal state, thus preventing subsequent sensors from effectively capturing the abnormal state. This improves the sensitivity of the sensor in detecting abnormal states of the battery pack, i.e., detecting whether thermal runaway has occurred, resulting in higher detection efficiency. It also reduces the risk of the vent valve failing to open properly when an abnormality occurs within the battery pack (e.g., thermal runaway), leading to thermal runaway heating and cracking of the casing.
[0007] This disclosure also provides an electrical device that includes the battery pack described above. Attached Figure Description
[0008] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.
[0009] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.
[0010] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.
[0011] Figure 1 This is an exploded view of a battery pack according to an embodiment of the present disclosure.
[0012] Figure 2 for Figure 1 A front view of the exhaust valve.
[0013] Figure 3 For along Figure 2 A cross-sectional view taken along line AA.
[0014] Figure 4 for Figure 3 A schematic diagram showing the open state of the exhaust passage of the exhaust valve.
[0015] Figure 5 for Figure 3 A schematic diagram showing the installation location of the pressure sensor on the exhaust valve.
[0016] Figure 6 for Figure 5 Enlarged view of section B.
[0017] Figure 7 For pressure sensors compared to Figure 5 Another installation location diagram is shown.
[0018] Figure 8 for Figure 3 The diagram shows the installation locations of other different types of sensors, including the exhaust valve.
[0019] Figure 9 To distinguish from Figure 3 A schematic diagram of another exhaust valve structure.
[0020] Figure 10 for Figure 9 A schematic diagram showing the open state of the exhaust passage of the exhaust valve.
[0021] Figure 11 for Figure 9 A schematic diagram showing the installation location of the pressure sensor on the exhaust valve.
[0022] Figure 12 for Figure 11 Enlarged view of section C.
[0023] Figure 13 for Figure 9 The diagram shows the installation locations of other different types of sensors, including the exhaust valve.
[0024] Figure 14 To distinguish from Figure 3 and Figure 9 A schematic diagram of another exhaust valve structure.
[0025] Figure 15 for Figure 14 A schematic diagram showing the open state of the exhaust passage of the exhaust valve.
[0026] Figure 16 for Figure 14 A schematic diagram showing the installation location of the pressure sensor on the exhaust valve.
[0027] Figure 17 To distinguish from Figure 14 A schematic diagram of the installation location of another pressure sensor.
[0028] Figure 18 for Figure 14 The diagram shows the installation locations of other different types of sensors, including the exhaust valve.
[0029] Figure 19 This is a schematic diagram of an electrical device provided according to an embodiment of the present disclosure. Detailed Implementation
[0030] Research has found that battery packs equipped with explosion-proof valves have a problem with insensitive detection when using sensors installed inside the battery pack to detect whether the battery pack is in an abnormal state. The specific reasons are as follows.
[0031] Sensors installed within the battery pack capture abnormal signals, such as pressure sensors detecting pressure changes. The detected pressure signals are then used to determine if thermal runaway has occurred. The pressure sensors are fixed to the inner wall of the enclosure, but their actual placement varies depending on the battery pack and management system components. For example, the pressure sensor might be placed on the bottom, top, or side wall of the enclosure, resulting in different positions relative to the explosion-proof valve.
[0032] For example, in some cases, the explosion-proof valve is located on the top wall of the enclosure, while the pressure sensor is located on the bottom wall. When the battery pack experiences thermal runaway, the internal temperature rises, leading to increased pressure. When the pressure exceeds a set threshold, the explosion-proof valve is triggered to open and release pressure. In some cases, the point of thermal runaway is close to the location of the explosion-proof valve, causing the internal pressure to increase similarly near the valve. However, the time between the thermal runaway and the triggering of the explosion-proof valve is short. This means that the pressure sensor may not detect a significant pressure change, or the detected pressure change may be too small to reach the trigger pressure value, before the valve is already activated. After the explosion-proof valve opens and releases pressure, the internal pressure of the battery pack decreases, and the pressure value detected by the pressure sensor returns to normal. This results in low sensitivity of the pressure sensor, making it unable to accurately detect abnormal states within the battery pack.
[0033] To improve the sensitivity of sensors in detecting abnormal states within the battery pack and to more accurately determine the battery pack's status, this disclosure improves the explosion-proof valve and sensors installed in the battery pack. The technical solutions in this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them.
[0034] <Example Battery Pack> First, it should be noted that the "battery pack" in this disclosure refers to an energy storage unit that independently outputs and receives electrical energy. This energy storage unit includes a casing and multiple battery cells connected in series and parallel within the casing to form a battery pack. Additionally, the casing generally includes a battery management system, electrical connection system, and protective structure. In this disclosure, the concept of "battery pack" can be used, but is not limited to, different types of energy storage units such as power battery packs and energy storage battery packs.
[0035] This disclosure provides a battery pack 100 according to embodiments. (See reference...) Figure 1 and Figure 2 The battery pack 100 may include a housing 10, a battery pack 20, and an exhaust valve 30. The housing 10 includes a top plate 11, a bottom plate 12, and a side beam 13 extending between the two, the top plate 11, the bottom plate 12, and the side beam 13 enclosing an internal space for accommodating the battery pack 20.
[0036] The battery pack 20 may include multiple battery cells 21, which can be electrically connected in series to form a relatively independent and integrated energy storage unit. In some embodiments, each battery pack 20 may include only one battery cell 21.
[0037] Exemplarily, the exhaust valve 30 is disposed on at least one side wall of the housing 10, and the exhaust valve 30 is provided with an exhaust channel 301. That is, the number of exhaust valves 30 can be one, located on one side wall of the housing 10; the number of exhaust valves 30 can be two or more, with multiple exhaust valves 30 disposed on different side walls of the housing 10; or the number of exhaust valves 30 can be two or more, with some exhaust valves 30 (e.g., one, two or more) disposed on one side wall of the housing 10, and other exhaust valves 30 disposed on other side walls of the housing 10; or two or more exhaust valves 30 can be all located on the same side wall of the housing 10. This embodiment of the present disclosure is only described with the number of exhaust valves 30 being one, but it is not intended to limit the embodiments of the present disclosure.
[0038] Under normal conditions, the exhaust passage 301 is closed, meaning the exhaust valve 30 is closed. When the battery pack 100 experiences thermal runaway, the internal pressure increases, triggering the exhaust valve 30 to open, thus opening the exhaust passage 301. This allows the gas inside the battery pack 100 to be discharged outside the housing 10 through the exhaust passage 301. The side wall of the housing 10 can be a top plate 11, a bottom plate 12, or a side beam 13. It should be noted that when the exhaust valve 30 is located on the side beam 13, the side beam 13 should be located on the outer periphery of the housing 10, not inside the housing 10 to separate the internal space. This ensures that even when the battery pack 100 experiences thermal runaway and the exhaust valve 30 is open, the internal and external spaces of the housing 10 can still be directly connected through the exhaust valve 30.
[0039] Additionally, refer to Figure 2 and Figure 3 The battery pack 100 also includes a sensor 40, which is integrated on the exhaust valve 30 to detect whether the battery pack 100 is malfunctioning, thereby determining whether the battery pack 100 has experienced the aforementioned thermal runaway fault. Furthermore, it triggers an alarm message when the aforementioned thermal runaway is detected. For example, the alarm message referred to herein includes, but is not limited to: audible alarm signals, visual alarm signals, combined audible and visual alarm signals, wireless alarm signals, text prompts, data alarm commands, and fault level identification information. When the sensor detects a thermal runaway fault in the battery pack, it triggers the battery management system to output corresponding alarm information to achieve at least one of local alarm, remote reporting, and system-wide protection.
[0040] Thermal runaway in the battery pack 100 will cause an abnormal state within the battery pack 100. The vent valve 30, as a channel for venting and depressurizing in the event of thermal runaway, will inevitably exhibit this abnormal state in and around the vent valve 30. For example, thermal runaway will cause an increase in air pressure within the battery pack 100. As the air pressure increases until it triggers the vent valve 30 to open for depressurization, this pressure will inevitably act on the vent valve 30 to trigger its opening.
[0041] Correspondingly, directly detecting temperature changes within the battery pack 100 can also intuitively determine whether thermal runaway has occurred. Similarly, if thermal runaway occurs in the battery pack 100, triggering the opening of the vent valve 30, the increased temperature will inevitably be reflected in the vent valve 30 and its surrounding area.
[0042] The exhaust valve 30 serves as a channel for venting and depressurizing when the battery pack 100 experiences thermal runaway. The abnormal state of the battery pack 100 caused by thermal runaway will inevitably be directly manifested at and near the exhaust valve 30. In this embodiment, the sensor 40 is integrated into the exhaust valve 30. The abnormal state triggered by thermal runaway of the battery pack 100 can be promptly captured by the sensor 40, reducing the problem that the exhaust valve 30 may open to depressurize before the sensor 40 detects the obvious abnormal state, thus preventing the sensor 40 from effectively capturing the abnormal state. This improves the sensitivity of the sensor 40 in detecting abnormal states of the battery pack 100, i.e., detecting whether thermal runaway has occurred, resulting in a higher detection effect. This reduces the risk of the exhaust valve 30 failing to open properly when an abnormality occurs inside the battery pack 100 (taking thermal runaway as an example), leading to thermal runaway heating and cracking of the housing 10.
[0043] Specifically, the above-mentioned abnormal states can include a variety of different types, including but not limited to displacement of the corresponding structure, abnormal pressure changes between the corresponding structures, abnormal changes in airflow velocity at the exhaust valve 30, smoke appearing inside the battery pack 100, abnormal changes in air pressure inside the battery pack 100, abnormal changes in temperature inside the battery pack 100, and abnormal changes in the content of gas components inside the battery pack 100.
[0044] Referring to the figure, the exhaust valve 30 includes a fixed part 302 and a movable part 303. The fixed part 302 is fixedly connected to the housing 10. Taking the exhaust valve 30 being mounted on the side beam 13 of the housing 10 as an example, the fixed part 302 and the side beam 13 are fixedly connected. For ease of explanation, in this embodiment, the exhaust valve 30 is described as being connected to the housing 10, and the top plate 11, bottom plate 12, and side beam 13 are no longer further distinguished. The movable part 303 is connected to the fixed part 302 and can move relative to the fixed part 302 to open and close the exhaust channel 301.
[0045] Accordingly, sensor 40 can be configured as displacement sensor 41. When sensor 40 is a displacement sensor 41, the relative position of the moving part 303 and the fixed part 302 can be detected by displacement sensor 41. In the initial state, the moving part 303 is in a first position relative to the fixed part 302, and in this state, the exhaust passage 301 is closed. When thermal runaway occurs in the battery pack 100, the position of the moving part 303 relative to the fixed part 302 changes to open the exhaust passage 301 for venting and depressurization. The displacement sensor 41 detects whether the position of the moving part 303 has changed. If a change occurs, it indicates that an abnormal state has occurred in the battery pack 100, and based on this, it can be determined that the battery pack 100 has experienced thermal runaway.
[0046] There are many different forms of the specific structure and connection method of the fixed part 302 and the movable part 303, as well as the specific form of the exhaust passage 301. For ease of description, the following will introduce the different exhaust valves 30.
[0047] The structure of the first type of exhaust valve 30 is as follows.
[0048] refer to Figure 3 and Figure 4 The exhaust valve 30 may include a valve body 31 and a cover 32, wherein the valve body 31 is fixedly connected to the housing 10, which is the aforementioned fixed part 302. The cover 32 is connected to the valve body 31 and can move relative to the valve body 31 to open or close the exhaust passage 301, which is the aforementioned movable part 303.
[0049] Specifically, the cover 32 and the valve body 31 are slidably connected. The valve body 31 has a through hole 311, which forms the exhaust channel 301. In the initial state, the end faces of the cover 32 and the valve body 31 are in contact, blocking the opening of the through hole 311, that is, closing the exhaust channel 301. When the cover 32 slides relative to the valve body 31 and separates from the end face of the valve body 31, the opening of the through hole 311 is in the open state, that is, opening the exhaust channel 301.
[0050] For example, the cover 32 is located on the side of the valve body 31 away from the interior of the housing 10 and is in contact with the valve body 31 to close the exhaust passage 301. A guide cylinder 33 is connected to the valve body 31, and a guide shaft 34 is connected to the cover 32. The guide shaft 34 is inserted into the guide cylinder 33 and slides with the guide cylinder 33 to achieve a sliding connection between the cover 32 and the valve body 31.
[0051] Specifically, the guide cylinder 33 is at least partially located within the through hole 311, such that one end of the guide cylinder 33 is located within the through hole 311, and the other end extends towards the inside of the housing 10 to the outside of the through hole 311. The guide cylinder 33 and the sidewall of the through hole 311 are fixedly connected by connecting ribs, thus ensuring that the through hole 311 remains in a connected state while achieving a fixed connection between the guide cylinder 33 and the valve body 31.
[0052] Both ends of the guide cylinder 33 are closed structures. An opening, smaller than the inner wall size of the guide cylinder 33, is provided at the end of the guide cylinder 33 facing the cover 32 for the guide shaft 34 to pass through. One end of the guide shaft 34 passes through the opening and is inserted into the guide cylinder 33. A retaining ring 341 is fixedly connected to the portion of the guide shaft 34 inserted into the guide cylinder 33. The retaining ring 341 is in contact with the inner wall of the guide cylinder 33 to reduce the problem of the guide shaft 34 wobbling relative to the guide cylinder 33. The guide shaft 34 is stable relative to the guide cylinder 33 and is not prone to wobbling or tilting during sliding, ensuring the stability of their relative sliding.
[0053] Additionally, refer to Figure 3 and Figure 4 A limiting spring 35 is provided between the valve body 31 and the cover 32. One end of the limiting spring 35 is connected to the valve body 31, and the other end is connected to the cover 32. The limiting spring 35 applies a spring force to the cover 32, causing the cover 32 to adhere to the valve body 31 and close the exhaust passage 301. In this embodiment, the limiting spring 35 applies a spring force to the cover 32 in the direction towards the inside of the housing 10, causing the cover 32 and the end face of the valve body 31 to adhere and close the exhaust passage. When thermal runaway occurs in the battery pack 100, causing the internal air pressure to increase, the pressure acts on the cover 32, overcoming the spring force applied to the cover 32 by the limiting spring 35, causing the cover 32 to move in the direction towards the outside of the housing 10. The end face of the cover 32 and the valve body 31 separate, opening the exhaust passage 301 to release pressure.
[0054] Exemplarily, in this embodiment of the present disclosure, the limiting spring 35 is sleeved on the guide shaft 34 and located inside the guide cylinder 33. One end of the limiting spring 35 is connected to the inner wall of the end of the guide cylinder 33, and the other end is connected to the abutment ring 341. Optionally, the end of the limiting spring 35 is fixedly connected to the guide cylinder 33 and the abutment ring 341 respectively. In other embodiments, the end of the limiting spring 35 may also be configured to abut against the guide cylinder 33 and the abutment ring 341 respectively.
[0055] Based on this type of exhaust valve 30 structure, the type and location of the sensor 40 are differentiated according to different abnormality types within the battery pack 100, as detailed below.
[0056] 1. Sensor 40 can be set as displacement sensor 41.
[0057] refer to Figure 3 and Figure 4 The displacement sensor 41 can be fixedly connected to the valve body 31, with its detection end facing the cover 32, to detect whether the relative position of the cover 32 relative to the valve body 31 has changed. For example, the displacement sensor 41 is fixedly connected to the side wall of the through hole 311, with its detection end facing the cover 32.
[0058] Alternatively, a displacement sensor 41 can be fixedly connected to the cover 32, with its detection end facing the valve body 31, to detect whether the relative position of the cover 32 relative to the valve body 31 has changed. The detection end of the displacement sensor 41 faces the connecting rib between the guide cylinder 33 and the through hole 311. In other embodiments, the detection end of the displacement sensor 41 can also be set to face the guide cylinder 33; or a detection point can be set on the side wall of the through hole 311, such as fixing a detection piece to the side wall of the through hole 311, with the detection end of the displacement sensor 41 facing the detection piece.
[0059] Furthermore, considering that the guide cylinder 33 and the valve body 31 are fixedly connected, and the guide shaft 34 and the cover 32 are fixedly connected, when using the displacement sensor 41 to detect whether the battery pack 100 has experienced thermal runaway, the displacement sensor 41 can also be configured to detect whether the position of the guide shaft 34 has changed. For example, refer to... Figure 3 and Figure 4 Alternatively, the displacement sensor 41 can be installed on the inner wall of the guide cylinder 41, with the detection end of the displacement sensor 41 facing the guide shaft 34, to detect the position of the guide shaft 34.
[0060] As described above, the displacement sensor 41 detects whether the position of the cover 32 or the guide shaft 34 has changed. If a change occurs, it indicates an abnormality within the battery pack 100, and the air is released through the vent valve 30. This allows for relatively sensitive and accurate detection of abnormal conditions within the battery pack 100.
[0061] It should be noted that the figure shows two displacement sensors 41 as an example. In actual settings, one of them can be set as needed, or both can be set at the same time, or displacement sensors 41 can be set in other locations, as long as they can detect the relative displacement between the cover 32 and the valve body 31.
[0062] Second, sensor 40 can be set as pressure sensor 42.
[0063] refer to Figure 5 and Figure 6 The valve body 31 has a first surface 312, and the cover 32 has a second surface 321. Under normal conditions, the first surface 312 and the second surface 321 are in contact to close the exhaust passage 301. A pressure sensor 42 is disposed on the first surface 312 or the second surface 321 to detect the pressure between the first surface 312 and the second surface 321. In some cases, the size of the pressure sensor 42 may affect the contact between the first surface 312 and the second surface 321. In such cases, a groove can be formed on the first surface 312 or the second surface 321 to house the pressure sensor 42.
[0064] For example, a groove is formed on the first surface 312, and a pressure sensor 42 is disposed in the groove, with the detection end of the pressure sensor 42 abutting against the second surface 321. In other embodiments, the groove may be provided on the second surface 321, or grooves may be provided on both the first surface 312 and the second surface 321.
[0065] In other embodiments, the pressure sensor 42 can also be positioned outside the first surface 312 and the second surface 321, provided that the pressure detected by the pressure sensor 42 changes synchronously with the pressure between the first surface 312 and the second surface 321. For example, the pressure sensor 42 can be positioned between the guide shaft 34 and the inner end face of the guide cylinder 33.
[0066] In addition, the force on the limit spring 35 can be detected by the pressure sensor 42. (Reference) Figure 7 A pressure sensor 42 is positioned between the limiting spring 35 and the abutment ring 341. When the cover 32 changes position relative to the valve body 31, the length of the limiting spring 35 changes accordingly, and the pressure between the limiting spring 35 and the abutment ring 341 also changes. Therefore, by detecting whether the pressure between the limiting spring 35 and the abutment ring 341 changes, it is possible to help determine whether there is an abnormality within the battery pack 100.
[0067] In other embodiments, a pressure sensor 42 may be provided between the inner end faces of the limiting spring 35 and the guide cylinder 33, or a pressure sensor 42 may be provided at both ends of the limiting spring 35.
[0068] The pressure sensor 42 is set to detect whether the pressure between the cover 32 and the valve body 31 changes. If the pressure changes, the cover 32 moves relative to the valve body 31, causing the exhaust channel 301 to open, thus detecting an abnormality in the battery pack 100.
[0069] Similarly, in actual setup, pressure sensor 42 can be set at one location or at multiple locations as needed.
[0070] Third, sensor 40 can be set as wind speed sensor 43.
[0071] refer to Figure 8 The wind speed sensor 43 is disposed within the exhaust channel 301. Exemplarily, the wind speed sensor 43 is fixedly connected to the side wall of the through hole 311, that is, fixedly connected to the valve body 31. In other embodiments, the wind speed sensor 43 may also be fixedly connected to the cover 32. It is sufficient to ensure that the wind speed sensor 43 is located within the exhaust channel 301, so that during the exhaust process through the exhaust channel 301, the gas flowing through the exhaust channel 301 passes through the wind speed sensor 43.
[0072] Under normal conditions, the exhaust passage 301 is closed, and no gas is generated at the location where the wind speed sensor 43 is installed. Therefore, the wind speed sensor 43 will not detect gas flow. When thermal runaway occurs in the battery pack 100, the exhaust valve 30 opens, allowing gas to escape through the open exhaust passage 301. At this time, the gas exhausted through the exhaust passage 301 flows through the wind speed sensor 43. The wind speed sensor 43 detects the change in wind speed, indicating that the battery pack 100 has malfunctioned and the exhaust valve 30 has been triggered to open and allow gas to escape.
[0073] By setting sensor 40 as a wind speed sensor 43, the gas flow rate in the exhaust channel 301 can be detected, which helps to determine the severity of the thermal runaway of the battery pack 100. While displacement sensor 41 or pressure sensor 42 can sensitively and accurately detect abnormal states in the battery pack 100, their principle is based on whether the exhaust valve 30 is open, only determining whether an abnormal state has occurred. However, by setting wind speed sensor 43, in addition to sensitively and accurately detecting whether an abnormal state has occurred in the battery pack 100, the severity of the thermal runaway of the battery pack 100 can also be determined by measuring the wind speed. The detection information is more comprehensive, which is beneficial for a more comprehensive assessment of the abnormal state of the battery pack 100 based on the test information.
[0074] IV. Sensor 40 can be set as smoke sensor 44.
[0075] refer to Figure 8The smoke sensor 44 is located on the side of the exhaust valve 30 facing inwards towards the housing 10, or inside the exhaust channel 301, or both. When thermal runaway occurs in the battery pack 100, a large amount of smoke will be generated inside the battery pack 100. The smoke sensor 44 inside the exhaust valve 30 can effectively detect abnormal conditions such as smoke generation inside the battery pack 100. Furthermore, as the gas pressure inside the battery pack 100 increases due to thermal runaway, eventually triggering the exhaust valve 30 to open and exhaust gas, smoke will be discharged through the exhaust channel 301. The smoke sensor 44 located in the exhaust channel 301 can effectively detect abnormal conditions such as smoke generation inside the battery pack 100.
[0076] 5. Sensor 40 can be set to barometric pressure sensor 45.
[0077] refer to Figure 8 The pressure sensor 45 is mounted on the exhaust valve 30. For example, the pressure sensor 45 can be fixedly connected to the valve body 31 or the cover 32. However, it should be ensured that under normal conditions, the mounting position of the pressure sensor 45 is in communication with the inside of the battery pack 100, that is, the inside of the housing 10.
[0078] When thermal runaway occurs in the battery pack 100, the temperature inside the battery pack 100 rises, which in turn causes the pressure inside the battery pack 100 to increase. The pressure sensor 45 can effectively detect whether there is an abnormal state of increased pressure inside the battery pack 100.
[0079] Furthermore, by integrating the pressure sensor 45 onto the exhaust valve 30, any abnormal pressure changes must first act on the exhaust valve 30 before it opens to release pressure. In this case, the pressure sensor 45 integrated onto the exhaust valve 30 can effectively detect abnormal pressure changes within the battery pack 100. This reduces the likelihood of the pressure sensor 45 failing to detect an abnormal state within the battery pack 100 when the pressure inside the battery pack 100 increases and triggers the exhaust valve 30 to open for pressure release.
[0080] VI. Sensor 40 can be set as temperature sensor 46.
[0081] refer to Figure 8The temperature sensor 46 is mounted on the exhaust valve 30. Exemplarily, the temperature sensor 46 can be fixedly connected to the valve body 31 or the cover 32. However, it should be ensured that under normal conditions, the installation location of the temperature sensor 46 and the interior of the battery pack 100, i.e., the interior of the housing 10, can exchange heat. This ensures that in the event of thermal runaway in the battery pack 100, the temperature changes within the battery pack 100 can be promptly detected by the temperature sensor 46. Preferably, the temperature sensor 46 is located on the side of the exhaust valve 30 facing the interior of the housing 10, or it is located within the exhaust channel 301.
[0082] Additionally, it should be noted that when the temperature sensor 46 is located in the exhaust channel 301, the temperature sensor 46 should be located on the side of the exhaust channel 301 facing inwards from the closed position. This will allow for more direct and effective capture of temperature changes inside the battery pack 100, i.e., inside the housing 10.
[0083] In other embodiments, the temperature sensor 46 may be positioned on the side of the exhaust channel 301 facing outwards from the housing 10 when the exhaust channel 301 is closed. In this case, when the exhaust channel 301 is opened, the gas inside the housing 10 is discharged through the exhaust channel 301, and the high-temperature gas can also directly act on the temperature sensor 46, enabling the temperature sensor 46 to sensitively detect abnormal states within the battery pack 100.
[0084] 7. Sensor 40 can be set as gas sensor 47.
[0085] refer to Figure 8 The gas sensor 47 is mounted on the exhaust valve 30. For example, the gas sensor 47 can be fixedly connected to the valve body 31 or the cover 32. However, it should be ensured that the installation position of the gas sensor 47 and the inside of the battery pack 100, that is, the inside of the housing 10, are in a state of communication when the exhaust valve 30 is closed or open.
[0086] When the battery pack 100 experiences thermal runaway, the gas composition and content of the emissions produced by the battery pack 100 differ significantly from those of air under normal conditions. Therefore, the presence of a specific type of gas in the environment where the gas sensor 47 is located can be used to determine whether the battery pack 100 is in an abnormal state. It should be further noted that the aforementioned specific type of gas can be: gases that are not commonly found in the air but are clearly present after the battery pack 100 experiences thermal runaway, or gases that are commonly found in the air but whose concentration increases significantly after the battery pack 100 experiences thermal runaway. For example, the aforementioned specific type of gas could be carbon monoxide, methane, fluoromethane, etc.
[0087] For example, when the battery pack 100 experiences thermal runaway, the generated gas contains a significant amount of carbon monoxide, whereas under normal conditions, the carbon monoxide content in the air is extremely low. Therefore, the gas sensor 47 can be configured as a carbon monoxide sensor, which can clearly detect changes in carbon monoxide concentration after the battery pack 100 experiences thermal runaway, thus capturing the abnormal state of the battery pack 100.
[0088] It should be noted that the different types of sensors 40 used in the embodiments of this disclosure are all products that have been used in the relevant fields and are readily available. The embodiments of this disclosure do not involve any change to the functional implementation principle of the sensor 40, so the specific working principle of each type of sensor 40 will not be described in detail.
[0089] Furthermore, the embodiments disclosed herein do not limit the type and number of sensors 40 used in the same exhaust valve 30, that is, two or even more different types of sensors 40 can be integrated on the exhaust valve 30 as needed.
[0090] The structure of the second type of exhaust valve 30 is as follows.
[0091] refer to Figure 9 and Figure 10 The exhaust valve 30 may include a valve body 31 and a cover 32, wherein the valve body 31 is used for fixed connection with the housing 10, which is the aforementioned fixed part 302. The cover 32 is connected to the valve body 31, and an exhaust passage 301 is formed between the cover 32 and the valve body 31. The cover 32 can move relative to the valve body 31 to open or close the exhaust passage 301, which is the aforementioned movable part 303.
[0092] A cavity 313 is formed on the valve body 31. One end of the cavity 313 facing the housing 10 is connected to the outer surface of the valve body 31, and the other end facing away from the housing 10 is also connected to the outer surface of the valve body 31, thus forming the exhaust channel 301. A closing part 314 is provided on the side wall of the cavity 313 to cooperate with the cover 32. The cover 32 and the closing part 314 are attached to close the exhaust channel 301.
[0093] For example, refer to Figure 9 and Figure 10 The closing part 314 is a protruding structure protruding from the side wall of the cavity 313, and the cover 32 is located on the side of the closing part 314 facing the outside of the housing 10. The side of the cover 32 facing the inside of the housing 10 is in contact with the closing part 314, closing the exhaust passage 301. When the cover 32 moves relative to the valve body 31 until the cover 32 and the closing part 314 are separated, the exhaust passage 301 is opened. It should be noted that a gap is left between the outer peripheral surface of the cover 32 and the side wall of the cavity 313 so that when the cover 32 and the closing part 314 are separated, the exhaust passage is in the open state.
[0094] For example, refer to Figure 9 and Figure 10 The size of the cover 32 can be set to be slightly smaller than the inner wall size of the cavity 313, that is, there is a certain gap between the outer peripheral surface of the cover 32 and the side wall of the cavity 313, and gas can flow through the gap.
[0095] In other embodiments, the outer peripheral surface of the cover 32 may be attached to the side wall of the cavity 313, and an opening may be provided on the cover 32 to form a channel for gas flow; and when the cover 32 and the closing part 314 are attached, the opening is blocked by the closing part 314. This method can ensure the stability of the relative position of the cover 32 and the valve body 31, and during the sliding process of the cover 32 relative to the valve body 31, it is less likely that the cover 32 will be misaligned and stuck in the cavity 313, thus preventing smooth sliding.
[0096] refer to Figure 9 and Figure 10 The exhaust valve 30 also includes a limiting spring 35, which is located within the cavity 313 and on the side of the cover 32 facing away from the interior of the housing 10. One end of the limiting spring 35 is connected to the cover 32, and the other end is connected to the inner wall of the cavity 313. The limiting spring 35 applies a spring force to the cover 32 toward the interior of the housing 10, keeping the cover 32 and the closing part 314 in contact to close the exhaust passage 301. When thermal runaway occurs in the battery pack 100, the air pressure inside the battery pack 100 increases, and the pressure acts on the cover 32, causing the cover 32 to slide away from the interior of the housing 10, separating from the closing part 314 to open the exhaust passage 301, and compressing the limiting spring 35 during the sliding process.
[0097] Based on this type of exhaust valve 30 structure, various types of sensors 40 can be set for different types of abnormalities within the battery pack 100. The difference between the sensors 40 set for the first type of exhaust valve 30 and those set for the second type of exhaust valve 30 lies in their location. Details identical to those for the sensors 40 in the first type of exhaust valve 30 will not be repeated. The specific locations of the different types of sensors 40 within the second type of exhaust valve 30 are as follows.
[0098] 1. Sensor 40 can be set as displacement sensor 41.
[0099] refer to Figure 9 and Figure 10The displacement sensor 41 can be fixedly connected to the valve body 31, with its detection end facing the cover 32, to detect whether the relative position of the cover 32 relative to the valve body 31 has changed. Exemplarily, referring to the figures, the displacement sensor 41 is fixedly connected to the side wall of the cavity 313, with its detection end facing the cover 32. It should be noted that, in this embodiment, the side wall of the cavity 313 can be either the circumferential inner wall of the cavity 313 or the end wall of the cavity 313.
[0100] Alternatively, a displacement sensor 41 can be fixedly connected to the cover 32, with its detection end facing the valve body 31, to detect whether the relative position of the cover 32 relative to the valve body 31 has changed. For example, referring to the figures, the displacement sensor 41 is fixedly connected to the cover 32, with its detection end facing the inner end wall of the cavity 313. In other embodiments, the detection end of the displacement sensor 41 can also be positioned facing the circumferential sidewall of the cavity 313, or a detection point can be set on the circumferential sidewall of the cavity 313, such as a detection plate fixedly connected to the circumferential sidewall of the cavity 313, with the detection end of the displacement sensor 41 facing the detection plate.
[0101] As described above, the displacement sensor 41 detects whether the position of the cover 32 has changed. If a change occurs, it indicates an abnormality within the battery pack 100, and the air is released through the vent valve 30. This allows for relatively sensitive and accurate detection of abnormal conditions within the battery pack 100.
[0102] Second, sensor 40 can be set as pressure sensor 42.
[0103] refer to Figure 11 and Figure 12 The valve body 31 is provided with a first surface 312, and the cover 32 is provided with a second surface 321. Specifically, the first surface 312 is the surface of the closing part 314 facing the cover 32, and the second surface 321 is the surface of the cover 32 that fits against the closing part 314 to close the exhaust passage 301.
[0104] Under normal conditions, the first surface 312 and the second surface 321 are in contact to close the exhaust passage 301. A pressure sensor 42 is disposed on either the first surface 312 or the second surface 321 to detect the pressure between them. In some cases, the size of the pressure sensor 42 may obstruct the contact between the first surface 312 and the second surface 321, preventing them from fully adhering. In such cases, a groove can be formed on either the first surface 312 or the second surface 321 to house the pressure sensor 42.
[0105] In addition, the force on the limit spring 35 can be detected by the pressure sensor 42. (Reference) Figure 11 A pressure sensor 42 is disposed between the limiting spring 35 and the end wall of the cavity 313. When the position of the cover 32 relative to the valve body 31 changes, the length of the limiting spring 35 changes accordingly, and the pressure between the limiting spring 35 and the end wall of the cavity 313 also changes. Therefore, by detecting whether the pressure between the limiting spring 35 and the end wall of the cavity 313 changes, it is possible to help determine whether there is an abnormality within the battery pack 100.
[0106] In other embodiments, a pressure sensor 42 may be provided between the limiting spring 35 and the cover 32, or pressure sensors 42 may be provided at both ends of the limiting spring 35.
[0107] The pressure sensor 42 is set to detect whether the pressure between the cover 32 and the valve body 31 changes. If the pressure changes, the cover 32 moves relative to the valve body 31, causing the exhaust channel 301 to open, thus detecting an abnormality in the battery pack 100.
[0108] Third, sensor 40 can be set as wind speed sensor 43.
[0109] refer to Figure 13 The wind speed sensor 43 is disposed within the exhaust channel 301. Exemplarily, the wind speed sensor 43 is fixedly connected to the side wall of the cavity 313, that is, fixedly connected to the valve body 31. In other embodiments, the wind speed sensor 43 may also be fixedly connected to the cover 32. It is sufficient to ensure that the wind speed sensor 43 is located within the exhaust channel 301, so that during the exhaust process through the exhaust channel 301, the gas flowing through the exhaust channel 301 passes through the wind speed sensor 43.
[0110] The position where the first surface 312 and the second surface 321 are in contact is defined as the closed position of the exhaust channel 301. The wind speed sensor 43 can be set on the side of the closed position facing the inside of the housing 10, or it can be set on the side of the closed position facing the outside of the housing 10.
[0111] IV. Sensor 40 can be set as smoke sensor 44.
[0112] The smoke sensor 44 is disposed on the side of the exhaust valve 30 facing the inside of the housing 10, or disposed in the exhaust channel 301, or disposed in both of the above locations. For example, the smoke sensor 44 can be fixedly connected to the side wall of the cavity 313.
[0113] Similarly, the smoke sensor 44 can be set on the side of the closed position facing inwards from the housing 10, or it can be set on the side of the closed position facing outwards from the housing 10.
[0114] 5. Sensor 40 can be set to barometric pressure sensor 45.
[0115] A pressure sensor 45 is mounted on the exhaust valve 30. Exemplarily, the pressure sensor 45 can be fixedly connected to the valve body 31 or to the cover 32. However, it should be ensured that, under normal conditions, the mounting position of the pressure sensor 45 is in communication with the inside of the battery pack 100, i.e., the inside of the housing 10. That is, the pressure sensor 45 is positioned on the side facing inwards from the housing 10 in the closed position, so that it can sensitively detect pressure changes in the event of thermal runaway of the battery pack 100.
[0116] VI. Sensor 40 can be set as temperature sensor 46.
[0117] Temperature sensor 46 is disposed on exhaust valve 30. Exemplarily, temperature sensor 46 can be fixedly connected to valve body 31 or fixedly connected to cover 32. Exemplarily, temperature sensor 46 is fixedly connected to the side wall of cavity 313 and located on the side of cover 32 facing the interior of housing 10. That is, temperature sensor 46 is disposed on the side facing the interior of housing 10 in the closed position so that it can sensitively detect temperature changes in the event of thermal runaway of battery pack 100.
[0118] 7. Sensor 40 can be set as gas sensor 47.
[0119] Gas sensor 47 is mounted on exhaust valve 30. Exemplarily, gas sensor 47 can be fixedly connected to valve body 31 or to cover 32. However, it should be ensured that the installation position of gas sensor 47 and the interior of battery pack 100, i.e., the interior of housing 10, are in communication when exhaust valve 30 is closed or open. In other words, smoke sensor 44 can be positioned either on the side facing inwards from housing 10 when closed, or on the side facing outwards from housing 10 when closed.
[0120] The structure of the third type of exhaust valve 30 is as follows.
[0121] refer to Figure 14 and Figure 15The exhaust valve 30 includes a valve seat 38 and a valve 39. The valve seat 38 is fixedly connected to the housing 10, which is the aforementioned fixing part 302. The valve 39 is connected to the valve seat 38 and forms a vent hole 391 that can be closed and opened. The valve seat 38 is also provided with a gas passage 381 that communicates with the vent hole 391. The gas passage 381 and the vent hole 391 constitute the exhaust passage 301.
[0122] The valve 39 itself is an openable and closable structure. Under normal conditions, the valve 39 is in a closed state. When the battery pack 100 experiences thermal runaway, the air pressure inside the battery pack 100, that is, inside the housing 10, increases. After the air pressure increases to a set threshold, the air pressure acts on the valve 39, causing the valve 39 to deform outward from the housing 10, thereby opening the vent 391, that is, opening the exhaust channel 301.
[0123] Based on this type of exhaust valve 30 structure, various types of sensors 40 can be set for different types of abnormalities within the battery pack 100. The difference between the sensors 40 set for the first and second type exhaust valves 30 and the sensors 40 set for the third type exhaust valve 30 lies in their location. Details identical to those for the sensors 40 set for the first and second type exhaust valves 30 will not be repeated. The specific locations of the different types of sensors 40 within the third type exhaust valve 30 are as follows.
[0124] 1. Sensor 40 can be set as displacement sensor 41.
[0125] refer to Figure 14 and Figure 15 The displacement sensor 41 is fixedly connected to the valve seat 38, and the detection end of the displacement sensor 41 is set towards the valve 39 to detect the position of the valve 39.
[0126] Under normal conditions, valve 39 is in its initial position and vent 391 is closed. When thermal runaway of battery pack 100 triggers the opening of vent valve 30 to vent, valve 39 deforms outward under the pressure of air inside housing 10.
[0127] Thus, when the displacement sensor 41 detects a change in the position of the valve 39, indicating that the valve 39 has changed position from the closed state to the open state, the exhaust channel 301 is opened, indicating that the battery pack 100 has experienced thermal runaway or related malfunctions. The displacement sensor 41 detects the position of the valve 39 to sensitively capture abnormal states inside the battery pack 100.
[0128] Second, sensor 40 can be set as pressure sensor 42.
[0129] For example, refer to Figure 16 The pressure sensor 42 is fixedly connected to the valve seat 38. The detection end of the pressure sensor 42 abuts against the valve 39. When the position of the valve 39 changes, the pressure value detected by the pressure sensor 42 changes accordingly, that is, it captures the abnormal state inside the battery pack 100.
[0130] In some embodiments, reference Figure 17 The valve seat 38 includes a cylindrical outer wall and a connecting portion disposed inside the outer wall. The connecting portion is conical, with its apex facing outwards from the housing 10. The apex of the connecting portion is an open structure, which serves as the gas passage 381 of the valve seat 38. A valve 39 is connected to the apex of the connecting portion and is located inside the cylindrical outer wall. A pressure sensor 42 is fixedly connected to the cylindrical outer wall, with its sensing end abutting against the valve 39 facing outwards from the housing 10.
[0131] Third, sensor 40 can be set as wind speed sensor 43.
[0132] refer to Figure 18 The wind speed sensor 43 is located inside the gas channel 381 and is fixedly connected to the valve seat 38.
[0133] IV. Sensor 40 can be set as smoke sensor 44.
[0134] refer to Figure 18 The smoke sensor 44 is located on the side of the exhaust valve 30 facing the inside of the housing 10, or inside the exhaust channel 301, or in both of the above locations. For example, the smoke sensor 44 can be fixedly connected to the side wall of the gas channel 381, that is, fixedly connected to the valve seat 38.
[0135] 5. Sensor 40 can be set to barometric pressure sensor 45.
[0136] refer to Figure 18 The pressure sensor 45 is disposed on the exhaust valve 30. Exemplarily, the pressure sensor 45 may be fixedly connected to the valve seat 38. For example, the pressure sensor 45 may be fixedly connected to the side wall of the gas passage 381.
[0137] VI. Sensor 40 can be set as temperature sensor 46.
[0138] refer to Figure 18 The temperature sensor 46 can be located on the side wall of the gas channel 381 and fixedly connected to the valve seat 38.
[0139] 7. Sensor 40 can be set as gas sensor 47.
[0140] refer to Figure 18The gas sensor 47 can be located on the side wall of the gas channel 381 and fixedly connected to the valve seat 38. In other embodiments, the gas sensor 47 can also be located on the side of the valve 39 facing away from the inside of the housing 10. However, it should be ensured that the installation position of the gas sensor 47 and the inside of the battery pack 100, that is, the inside of the housing 10, can be in communication when the exhaust valve 30 is closed or open.
[0141] <Example Electrical Equipment> This disclosure also provides an electrical device that may include the battery or battery pack described above.
[0142] By way of example only, the electrical equipment in the embodiments of this disclosure can be, but is not limited to, vehicles, ships, aircraft, household appliances, or industrial equipment. Vehicles referred to herein can be, but are not limited to, passenger cars, trucks, and construction vehicles. Furthermore, the electrical equipment in the embodiments of this disclosure can also be an energy storage system for storing, converting, and releasing recyclable electrical energy.
[0143] According to a non-limiting embodiment of the present disclosure, an electrical appliance 1000 is... Figure 19 As shown in the image. (Reference) Figure 19 The electrical device 1000 is an electric vehicle, which may include the aforementioned battery pack 100. In the electric vehicle, the battery pack 100 can be used as a power source to provide power to the electric vehicle.
[0144] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.
[0145] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.
[0146] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.
Claims
1. A battery pack, characterized in that, include Battery pack; The housing contains the battery pack; An exhaust valve is provided on at least one side wall of the housing, for forming an exhaust channel for the gas inside the housing to be discharged in the event of thermal runaway of the battery pack; A sensor, integrated into the exhaust valve, detects whether thermal runaway has occurred and triggers a warning message when thermal runaway occurs.
2. The battery pack according to claim 1, characterized in that, The exhaust valve includes a fixed part fixedly connected to the housing and a movable part connected to the fixed part. The movable part can move relative to the fixed part to open or close the exhaust passage. The sensor is a displacement sensor, which is used to detect the relative position of the movable part and the fixed part.
3. The battery pack according to claim 2, characterized in that, The fixed part is a valve body fixedly connected to the housing, and the movable part is a cover body slidably connected to the valve body. The exhaust channel is formed between the valve body and the cover body. The displacement sensor is fixed to the valve body and detects the relative position of the cover body, or the displacement sensor is fixed to the cover body and detects the relative position of the valve body.
4. The battery pack according to claim 3, characterized in that, A limiting spring is provided between the valve body and the cover. One end of the limiting spring is fixed relative to the valve body, and the other end is fixed relative to the cover. The limiting spring applies an elastic force to the cover so that the cover fits against the valve body to close the exhaust channel.
5. The battery pack according to claim 2, characterized in that, The fixed part is a valve body fixedly connected to the housing, and the movable part is a valve fixedly connected to the valve body. The valve forms an exhaust channel that can be opened and closed. The displacement sensor is fixed relative to the valve body and is used to detect the position of the valve closing the exhaust channel.
6. The battery pack according to claim 1, characterized in that, The exhaust valve includes a fixed part fixedly connected to the housing and a movable part connected to the fixed part. The movable part can move relative to the fixed part to open or close the exhaust passage. The sensor is a pressure sensor used to detect pressure changes between the movable part and the fixed part or pressure changes between different positions of the movable part itself.
7. The battery pack according to claim 6, characterized in that, The fixed part is a valve body fixedly connected to the housing, and the movable part is a cover body slidably connected to the valve body. The exhaust channel is formed between the valve body and the cover body. The valve body has a first surface, and the cover body has a second surface. The first surface and the second surface are fitted together to close the exhaust channel. The pressure sensor is used to detect the pressure between the first surface and the second surface.
8. The battery pack according to claim 6, characterized in that, The movable part is slidably connected to the fixed part inside, and the exhaust channel is formed between the fixed part and the movable part. A limiting spring is provided between the fixed part and the movable part. The limiting spring applies an elastic force to the movable part to make it adhere to the fixed part to close the exhaust channel. The pressure sensor is connected to at least one end of the limiting spring.
9. The battery pack according to claim 6, characterized in that, The fixed part is a valve body fixedly connected to the housing, the movable part is a valve fixedly connected to the valve body, the valve surrounds to form an exhaust channel, the pressure sensor includes at least a pressure detection end disposed in contact with the inner surface of the valve, and / or, the pressure sensor is fixed relative to the fixed part, and the pressure detection end of the pressure sensor is in contact with the outer surface of the valve.
10. The battery pack according to claim 1, characterized in that, The sensor is a wind speed sensor, which is installed inside the exhaust channel.
11. The battery pack according to claim 1, characterized in that, The sensor is a smoke sensor, which is located on the side of the exhaust valve facing the housing and / or in the exhaust channel.
12. The battery pack according to claim 1, characterized in that, The sensor is a pressure sensor, which is located on the side of the exhaust valve facing the housing and / or in the exhaust channel.
13. The battery pack according to claim 1, characterized in that, The sensor is a temperature sensor, which is located on the side of the exhaust valve facing the housing and / or in the exhaust channel.
14. The battery pack according to claim 1, characterized in that, The sensor is a gas sensor, which is disposed on the side of the exhaust valve facing the housing and / or in the exhaust channel, and is used to detect the concentration of a specific type of gas.
15. The battery pack according to claim 14, characterized in that, The gas sensor is used to detect the concentration of carbon monoxide and / or fluoromethane.
16. The battery pack according to claim 3 or 7, characterized in that, The exhaust passage is a through hole opened on the valve body, and the cover is located on the side of the valve body away from the inside of the housing, and is attached to the valve body to close the exhaust passage.
17. The battery pack according to claim 16, characterized in that, The valve body is provided with a guide cylinder, the cover is provided with a guide shaft, the guide shaft and the guide cylinder are slidably engaged, and the sensor is disposed between the end wall of the guide shaft and the end wall of the guide cylinder.
18. The battery pack according to claim 3 or 7, characterized in that, The valve body has a cavity, and both ends of the cavity facing the housing and away from the housing are connected to the outer surface of the valve body to form the exhaust channel. The cover is located in the cavity, and the side wall of the cavity has a closing part that cooperates with the cover. The cover is attached to the closing part to close the exhaust channel.
19. The battery pack according to claim 18, characterized in that, The sensor is disposed between the surfaces of the cover and the closure that are in contact with each other.
20. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 19.