Battery pack and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and provides a battery pack and electric equipment. The battery pack comprises a box body, an anti-explosion valve and a first water immersion sensor, a containing cavity is formed in the box body, the containing cavity is used for containing a battery cell, the box body is provided with an exhaust port and a liquid collecting tank, the anti-explosion valve is arranged at the exhaust port, the exhaust port is communicated with the containing cavity, the liquid collecting tank is communicated with the exhaust port, and the first water immersion sensor is arranged in a liquid storage tank. The first water immersion sensor is used for detecting whether liquid exists in the liquid storage tank or not. According to the battery pack provided by the invention, whether external liquid leaks at the joint of the anti-explosion valve and the box body or not can be detected in time, and the reliability of the battery pack is high.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack and an electrical device. Background Technology

[0002] Battery packs are used to provide power to electrical equipment such as electric vehicles.

[0003] The battery pack consists of a housing and an explosion-proof valve, which is installed on the outer wall of the housing. In the event of thermal runaway, when the internal pressure of the battery pack becomes excessive, the explosion-proof valve can open, allowing overpressurized gas to escape. This facilitates the timely removal of excess gas from the housing and prevents the battery pack from exploding due to thermal runaway. However, the connection between the explosion-proof valve and the housing may be poorly sealed, allowing external liquids to enter the housing through the gaps. This can cause malfunctions in the electronic components inside the housing; for example, high-voltage components may experience arcing, which can also lead to thermal runaway of the battery pack.

[0004] In related technologies, it is difficult to detect in a timely manner whether there is leakage of external liquid at the connection between the explosion-proof valve and the enclosure, resulting in low battery pack reliability. Utility Model Content

[0005] This application provides a battery pack and electrical equipment that can promptly detect whether there is leakage of external liquid at the connection between the explosion-proof valve and the enclosure, resulting in high battery pack reliability.

[0006] This application provides a battery pack, including: a housing, an explosion-proof valve, and a first immersion sensor. The housing has a receiving cavity for accommodating battery cells. The housing has an exhaust port and a liquid collection tank. The explosion-proof valve is located at the exhaust port and communicates with the receiving cavity. The liquid collection tank is also communicated with the exhaust port. The first immersion sensor is located in the liquid collection tank and is used to detect whether there is liquid in the liquid collection tank.

[0007] In one possible implementation, the battery pack provided in this application includes a bottom plate and a side plate, which together form a receiving cavity. The side plate has an exhaust port, an explosion-proof valve is connected to the side plate, and a liquid collection tank is located in the receiving cavity.

[0008] In one possible implementation, the housing further includes a connecting wall that surrounds the vent and is connected to the side plate. The connecting wall and the side plate together form a liquid collection tank that communicates with the receiving cavity.

[0009] In one possible implementation, the battery pack provided in this application has a connecting wall including a side wall, which is disposed opposite to the exhaust port, and a first immersion sensor is connected to the side wall.

[0010] In one possible implementation, the battery pack provided in this application further includes a connector, through which the first immersion sensor is connected to the side wall.

[0011] In one possible implementation, the battery pack provided in this application further includes a bottom wall as the connecting wall, and a side wall is connected to the periphery of the bottom wall. The bottom wall, side wall, and side plate together form a liquid collection tank.

[0012] In one possible implementation, the battery pack provided in this application has a first gap between the first immersion sensor and the bottom surface of the liquid collection tank.

[0013] In one possible implementation, the battery pack provided in this application has a liquid collection tank with an opening away from the bottom plate, and the opening communicates with the receiving cavity.

[0014] In one possible implementation, the battery pack provided in this application further includes a battery manager. The first immersion sensor includes a first sensor body and a first lead. The first sensor body is disposed within a liquid collection tank. One end of the first lead is electrically connected to the first sensor body, and the other end of the first lead extends outside the liquid collection tank to be electrically connected to the battery manager. In another possible implementation, the battery pack provided in this application further includes a battery cell and at least one second immersion sensor. Both the battery cell and the second immersion sensor are located within a receiving cavity; the second immersion sensor is used to detect the presence of liquid within the receiving cavity.

[0015] In one possible implementation, the battery pack provided in this application includes a second immersion sensor comprising a second sensor body and a second lead, one end of the second lead being electrically connected to the second sensor body and the other end of the second lead being electrically connected to the battery manager.

[0016] In one possible implementation, the battery pack provided in this application has multiple second immersion sensors, which are spaced apart.

[0017] In one possible implementation, the battery pack provided in this application includes an explosion-proof valve comprising a housing and a sealing ring, wherein the housing is connected to the casing and the sealing ring is disposed between the outer surfaces of the housing and the casing.

[0018] This application also provides an electrical device including the aforementioned battery pack.

[0019] The battery pack provided in this application, by incorporating a housing, an explosion-proof valve, and a first immersion sensor, features a housing cavity within the housing for storing battery cells. The housing has an vent and a collection tank. The explosion-proof valve is connected to the vent, which communicates with the housing cavity, and the collection tank is also connected to the vent. Because the explosion-proof valve and the vent are connected, and the vent and the collection tank are also connected, when external liquid enters the housing cavity through the connection between the explosion-proof valve and the housing via the vent, it flows into the collection tank. The collection tank contains the first immersion sensor, which can promptly detect any leakage at the connection between the explosion-proof valve and the housing when external liquid flows into the housing cavity, resulting in high battery pack reliability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 for Figure 2 An explosion diagram;

[0024] Figure 4 This is a schematic diagram of the connection between the explosion-proof valve and the housing in the battery pack provided in an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the structure of the explosion-proof valve in the battery pack provided in the embodiments of this application;

[0026] Figure 6 for Figure 5 A schematic diagram of the internal structure.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100 - Box;

[0029] 110 - Exhaust port;

[0030] 120 - Box body; 121 - Bottom plate; 122 - Side plate; 123 - Partition;

[0031] 130 - Receiving cavity; 131 - Sub-receiving cavity;

[0032] 200-Explosion-proof valve;

[0033] 210 - First fastener;

[0034] 220 - Outer shell; 221 - Mounting lug; 2211 - First mounting hole; 222 - Outer shell body; 223 - Shell cover;

[0035] 230 - Sealing ring; 240 - Explosion-proof sheet; 250 - Elastic element;

[0036] 300 - Liquid collection tank;

[0037] 310 - Opening;

[0038] 320 - Channel wall; 321 - Bottom wall; 322 - Side wall; 323 - Connector;

[0039] 400 - First immersion sensor; 410 - First sensor body; 420 - First lead wire; 430 - Second fastener;

[0040] 500-cell;

[0041] 600-Battery Manager;

[0042] 700 - Second immersion sensor; 710 - Sensor body; 720 - Second lead;

[0043] D1 - First gap;

[0044] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] The terms "first," "second," and "third" (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0049] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or maintenance tool that includes a series of steps or units, not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or maintenance tool.

[0050] Battery packs are used to provide power to electrical equipment such as electric vehicles.

[0051] The battery pack includes a housing and an explosion-proof valve, which is installed on the outer wall of the housing. In the event of thermal runaway of the battery pack, when the internal pressure of the housing becomes excessive, the passage of the explosion-proof valve can be opened, allowing the overpressurized gas to escape through the valve passage. This facilitates the timely removal of overpressurized gas from the housing and prevents the battery pack from exploding due to thermal runaway.

[0052] When connecting the explosion-proof valve to the enclosure, a sealing ring can be installed between the valve and the enclosure to improve their sealing performance. However, if the sealing ring is not compressed sufficiently or ages due to prolonged use, its sealing performance will be poor. External liquids (such as rainwater) can then enter the enclosure through the gap between the valve and the enclosure, causing malfunctions in the electronic components inside. For example, moisture corrosion can damage electronic components, or arcing can occur in high-voltage components. Arcing can also lead to thermal runaway in the battery pack.

[0053] In related technologies, it is difficult to detect in a timely manner whether there is leakage of external liquid at the connection between the explosion-proof valve and the enclosure.

[0054] Based on this, embodiments of this application provide a battery pack and electrical equipment that can promptly detect whether there is leakage of external liquid at the connection between the explosion-proof valve and the housing.

[0055] Figure 1 This is a schematic diagram of the battery pack structure provided in an embodiment of this application. Figure 2 for Figure 1 Enlarged diagram of point A in the middle. Figure 3 for Figure 2 An explosion diagram. Figure 4 This is a schematic diagram of the connection between the explosion-proof valve and the housing in the battery pack provided in an embodiment of this application.

[0056] See Figures 1 to 4 As shown, the battery pack provided in this application includes a housing 100, an explosion-proof valve 200, and a first immersion sensor 400. The housing 100 has a vent 110 and a liquid collection tank 300. The housing 100 contains a receiving cavity 130 for accommodating battery cells 500. The explosion-proof valve 200 is located at the vent 110. The liquid collection tank 300 is connected to the vent 110. The first immersion sensor 400 is located within the liquid collection tank 300 and is used to detect the presence of liquid in the liquid collection tank 300.

[0057] The enclosure 100 may include an enclosure body 120 and a top cover (not shown in the figure). The enclosure body 120 may be a cuboid structure or other shapes. Figure 1 In the illustrated embodiment, the box 100 has a cuboid structure, with its length direction being the first direction X, its width direction being the second direction Y, and its height direction being the third direction Z. The box body 120 has a receiving cavity 130 that is open on one side.

[0058] The battery pack also includes battery cells 500, which are located in the receiving cavity 130. There can be one or more battery cells 500, which can be connected in series or in parallel, and can be electrically connected to each other via copper busbars. Figure 1 Multiple battery cells 500 are shown. The multiple battery cells 500 are arranged side by side along the second direction Y. A top cover is placed on the housing body 120 to form a sealed housing.

[0059] When one or more battery cells 500 in the enclosure 100 generate a large amount of heat or gas due to thermal runaway, overpressure gas will be generated inside the enclosure 100. An explosion-proof valve 200 can be installed on the enclosure 100. When overpressure gas is generated in the enclosure 100, the overpressure gas will open the exhaust channel in the explosion-proof valve 200 to release the overpressure gas inside the enclosure 100 in a timely manner.

[0060] Please continue reading Figures 2 to 4As shown, the housing 100 has an exhaust port 110. The explosion-proof valve 200 can be connected to the outer surface of the housing 100 and communicate with the exhaust port 110 via the first fastener 210. For example, the explosion-proof valve 200 can be aligned with the exhaust port 110, and overpressure gas can pass through the exhaust port 110 to open the exhaust passage in the explosion-proof valve 200.

[0061] External liquids (such as rainwater) can enter the containment cavity 130 through the connection between the explosion-proof valve 200 and the housing 100, and then through the vent 110. The liquid can cause arcing in the components (such as the battery cell 500 or copper busbar) in the containment cavity 130.

[0062] This application embodiment solves the problem by setting up a liquid collection tank 300 and a first immersion sensor 400.

[0063] Specifically, the liquid collection tank 300 is also connected to the exhaust port 110. For example, the liquid collection tank 300 can be aligned with the exhaust port 110, or the liquid collection tank 300 and the exhaust port 110 can be staggered. When the liquid collection tank 300 and the exhaust port 110 are staggered, the liquid collection tank 300 can be connected to the exhaust port 110 through a guide channel. In other words, both the liquid collection tank 300 and the explosion-proof valve 200 are connected to the exhaust port 110.

[0064] The first immersion sensor 400 is disposed within the collection tank 300. The first immersion sensor 400 can be a contact immersion sensor or a non-contact sensor. Taking a contact immersion sensor 400 as an example, the detection principle of the first immersion sensor 400 is explained. The first immersion sensor 400 includes two probes with opposite polarities. When not in contact with liquid, the two probes are insulated by air. When in contact with liquid, the two probes are conductive, and the resistance of the first immersion sensor 400 decreases, thereby detecting the presence of liquid in the collection tank 300. When external liquid (e.g., rainwater) enters the receiving cavity 130 through the connection between the explosion-proof valve 200 and the housing 100, and then through the vent 110, the external liquid will enter the collection tank 300. The liquid collection tank 300 is equipped with a first immersion sensor 400, which can detect the presence of liquid in the liquid collection tank 300. Based on the detection result of the first immersion sensor 400, it can promptly detect whether external liquid has entered the housing 100, so as to promptly detect whether there is leakage of external liquid at the connection between the explosion-proof valve 200 and the housing 100.

[0065] It should be noted that the battery pack may include multiple explosion-proof valves 200. Figure 1Two explosion-proof valves 200 are schematically shown. A collection tank 300 and a first immersion sensor 400 can be provided at a position aligned with each explosion-proof valve 200, or the collection tank 300 and the first immersion sensor 400 can be provided at positions aligned with some of the explosion-proof valves 200. Figure 1 In the middle, a liquid collection tank 300 and a first immersion sensor 400 are set at a position aligned with one of the explosion-proof valves 200.

[0066] The battery pack provided in this embodiment includes a housing 100, an explosion-proof valve 200, and a first immersion sensor 400. The housing 100 has an exhaust port 110 and a liquid collection tank 300, with the explosion-proof valve 200 located at the exhaust port 110. The liquid collection tank 300 is positioned opposite and communicates with the exhaust port 110. Since the explosion-proof valve 200 communicates with the exhaust port 110, and the exhaust port 110 communicates with the liquid collection tank 300, when external liquid flows through the connection between the explosion-proof valve 200 and the housing 100, and then through the exhaust port 110 into the receiving cavity 130, it will flow into the liquid collection tank 300. The first immersion sensor 400 is installed in the liquid collection tank 300, thus enabling the first immersion sensor 400 to detect leakage at the connection between the explosion-proof valve 200 and the housing 100 when external liquid flows into the receiving cavity 130.

[0067] Please continue reading Figures 1 to 4 As shown, the housing 100 includes a bottom plate 121 and a side plate 122, which together form a receiving cavity 130. The side plate 122 has the exhaust port 110, an explosion-proof valve 200 is connected to the side plate 122, and a liquid collection tank 300 is located in the receiving cavity 130.

[0068] Please continue reading Figure 1 As shown, the housing body 120 may include a bottom plate 121 and side plates 122 surrounding the bottom plate 121, the side plates 122 and the bottom plate 121 forming a receiving cavity 130 open on one side. The housing body 120 also includes a partition 123, which may extend along the second direction Y to divide the receiving cavity 130 into two sub-receiving cavities 131, each sub-receiving cavity 131 being provided with a plurality of battery cells 500.

[0069] The liquid collection tank 300 can be connected to either the side plate 122 or the bottom plate 121, and is located within the receiving cavity 130. The explosion-proof valve 200 is also connected to the side plate 122, and is typically installed away from the receiving cavity 130. That is, when external liquid enters the receiving cavity 130 through the connection between the explosion-proof valve 200 and the side plate 122, it will also enter the liquid collection tank 300. The detection result of the first immersion sensor 400 in the liquid collection tank 300 can promptly determine whether liquid has flowed into the receiving cavity 130.

[0070] Please continue reading Figures 2 to 4 As shown, the housing 100 also includes a connecting wall 320, which surrounds the exhaust port 110 and is connected to the side plate 122. The connecting wall 320 and the side plate 122 together form a liquid collection tank 300, which is connected to the receiving cavity 130.

[0071] The connecting wall 320 can be arranged around the vent 110. The connecting wall 320 can be connected to the inner surface of the side plate 122 by welding, or the connecting wall 320 can be integrally formed with the side plate 122. By arranging the connecting wall 320 around the vent 110 and forming a liquid collection tank 300 with the side plate 122, external liquid entering the receiving cavity 130 through the vent 110 will first enter the liquid collection tank 300, so that it can be detected in time by the first immersion sensor 400 in the liquid collection tank 300.

[0072] In other embodiments, the liquid collection tank 300 may also be a groove provided on the base plate 121, the plane of the groove being lower than the plane of the base plate 121, thereby allowing external liquid to flow into the groove.

[0073] Please continue reading Figures 2 to 4 As shown, the connecting wall 320 includes a side wall 322, which is disposed opposite to the exhaust port 110, and the first immersion sensor 400 is connected to the side wall 322.

[0074] The side wall 322 is positioned opposite to the vent 110 to facilitate timely interception of external liquid flowing in from the vent 110. The first immersion sensor 400 is connected to the side of the side wall 322 facing the vent 110 to facilitate timely detection of liquid in the collection tank 300.

[0075] Please continue reading Figure 3 As shown, the battery pack also includes a connector 323, through which the first immersion sensor 400 is connected to the side wall 322.

[0076] The first immersion sensor 400 is small in size and inconvenient to connect to the side wall 322. Therefore, the first immersion sensor 400 can be connected to the connector 323 first, and then the connector 323 can be connected to the side wall 322. For example, the first immersion sensor 400 can be glued or snapped onto the connector 323. The connector 323 can be connected to the side wall 322 via the second fastener 430, and the connector 323 can also be glued to the side wall 322 to ensure a reliable connection between the first immersion sensor 400 and the side wall 322.

[0077] In some embodiments, the connecting wall 320 can be a metal component. When the first immersion sensor 400 contacts the connecting wall 320, the connecting wall 320 will conduct electricity to both probes of the first immersion sensor 400, causing a change in the resistance of the first immersion sensor 400 and resulting in measurement errors. Therefore, the connector 323 can be made of an insulating material. Thus, connecting the first immersion sensor 400 and the side wall 322 via the connector 323 can also prevent the probes of the first immersion sensor 400 from contacting the side wall 322.

[0078] The connecting wall 320 also includes a bottom wall 321 and a side wall 322 connected to the periphery of the bottom wall 321. The bottom wall 321, the side wall 322 and the side plate 122 enclose and form a liquid collection tank 300.

[0079] By setting a bottom wall 321 and connecting a side wall 322 to the periphery of the bottom wall 321, the bottom wall 321, the side wall 322 and the side plate 122 enclose a liquid collection tank 300, which makes the structure of the liquid collection tank 300 compact and the space in the liquid collection tank 300 small. Even when a small amount of external liquid enters the liquid collection tank 300, the first immersion sensor 400 located in the liquid collection tank 300 can detect it in time.

[0080] In another possible implementation, the bottom plate 121 of the housing 100 can be used as the bottom wall of the liquid collection tank 300, thereby forming the liquid collection tank 130 by the side wall 322, the bottom plate 121, and the side plate 122. The first immersion sensor 400 can also be connected to the bottom wall 321 or the bottom plate 121 of the housing 100 via a connector 323.

[0081] Please continue reading Figure 4 As shown, there is a first gap D1 between the first immersion sensor 400 and the bottom surface of the liquid collection tank 300.

[0082] The first immersion sensor 400 is spaced apart from the bottom of the liquid collection tank 300. The bottom of the liquid collection tank 300 can be a bottom wall 321 or a bottom plate 121. Figure 4The bottom wall 321 is shown in the diagram. The distance between the first immersion sensor 400 and the bottom of the collection tank 300 is a first gap D1, which prevents the probe of the first immersion sensor 400 from contacting the bottom plate 121 or the bottom wall 321. When the liquid level in the collection tank 300 rises to the point where the liquid contacts the probe of the first immersion sensor 400, the resistance value of the first immersion sensor 400 changes, thereby measuring whether there is liquid in the collection tank 300. The water level can also be determined by the resistance of the first immersion sensor 400. The higher the liquid level in the collection tank 300, the lower the resistance value obtained by the first immersion sensor 400. That is, the resistance value of the first immersion sensor 400 is proportional to the height of the liquid level in the collection tank 300. Therefore, the liquid level in the collection tank 300 can be determined by the resistance value.

[0083] Please continue reading Figures 2 to 4 As shown, the liquid collection tank 300 has an opening 310 facing away from the bottom plate 121, and the opening 310 is connected to the receiving cavity 130.

[0084] The liquid collection tank 300 has an opening 310 that communicates with the receiving cavity 130. Overpressurized gas in the receiving cavity 130 is then discharged sequentially through the opening 310, the vent 110, and the explosion-proof valve 200. By providing an opening in the liquid collection tank 300 that communicates with the receiving cavity 130, leakage of external liquid can be detected promptly at the connection between the explosion-proof valve 200 and the housing 100 without affecting the battery pack's venting. In other embodiments, the opening 310 may also be located on the side wall 322.

[0085] Please continue reading Figures 1 to 4 As shown, the battery pack also includes a battery manager 600. The first immersion sensor 400 includes a first sensor body 410 and a first lead 420. The first sensor body 410 is disposed in the liquid collection tank 300. One end of the first lead 420 is electrically connected to the first sensor body 410, and the other end of the first lead 420 extends out of the liquid collection tank 300 to be electrically connected to the battery manager 600.

[0086] The battery manager 600 can monitor various status parameters of the battery pack in real time, such as voltage, current, temperature, and state of charge (SOC), ensuring safe use of the battery during charging and discharging. In one possible implementation, the battery manager 600 may include a detection module, a control module, and a display module, both of which are electrically connected to the control module. The detection module acquires various status parameters of the battery pack and transmits them to the control module. The control module processes the status parameters, and the display module displays the processed status parameters.

[0087] In this embodiment, the first immersion sensor 400 can also be electrically connected to the battery manager 600. Specifically, the first sensor body 410 can be connected to the connecting wall 320 via the connector 323, and the first sensor body 410 is electrically connected to the battery manager 600 via the first lead 420. The first sensor body 410 can be used to measure whether there is liquid in the collection tank 300 to obtain a first measurement value, and the first lead 420 transmits the first measurement value to the battery manager 600. Thus, the battery manager 600 can obtain the first measurement value in a timely manner to detect whether there is a leakage problem at the connection between the explosion-proof valve 200 and the housing 100. It should be noted that the first immersion sensor 400 can also be wirelessly connected to the battery manager 600.

[0088] Specifically, the first sensor body 410 converts and processes the resistance value to form a first measured value. This first measured value can be transmitted to the battery manager 600 via the first lead 420, thereby determining whether there is liquid in the collection tank 300 and quickly identifying whether there is water immersion. The resistance of the first immersion sensor 400 can also be used to determine the water level. The higher the liquid level in the collection tank 300, the lower the resistance value obtained by the first sensor body 410. Consequently, the magnitude of the first measured value after conversion and processing by the first sensor body 410 also varies. In other words, the first measured value of the first sensor body 410 is proportional to the liquid level in the collection tank 300. Therefore, the magnitude of the first measured value can be used to determine the liquid level in the collection tank 300.

[0089] Please continue reading Figure 1 As shown, the battery pack also includes at least one second immersion sensor 700, which is located inside the receiving cavity 130. The second immersion sensor 700 is used to detect whether there is liquid inside the receiving cavity 130.

[0090] The second immersion sensor 700 can be installed on the base plate 121 or the side plate 122. When there is liquid in the receiving cavity 130 (for example, when the electrolyte in the battery cell 500 leaks or external liquid enters the receiving cavity 130 from other areas on the housing 100), the second immersion sensor 700 can detect it in time.

[0091] The second immersion sensor 700 includes a second sensor body 710 and a second lead 720. One end of the second lead 720 is electrically connected to the second sensor body 710, and the other end of the second lead 720 is electrically connected to the battery manager 600. The second immersion sensor 700 can also be wirelessly connected to the battery manager 600.

[0092] The second sensor body 710 can be connected to the base plate 121 or the side plate 122 via a connector. Figure 1In the illustrated embodiment, the second sensor body 710 is attached to the base plate 121 via a connector. The second sensor body 710 acquires a second measurement value and transmits it to the battery manager 600 via the second lead 720. The method by which the second sensor body 710 acquires the second measurement value is the same as the principle by which the first sensor body 410 acquires the first measurement value, and will not be described in detail here.

[0093] Please continue reading Figure 1 As shown, there are multiple second immersion sensors 700, which are spaced apart in the receiving cavity 130.

[0094] Multiple second immersion sensors 700 can be installed in the receiving cavity 130. The multiple immersion sensors 700 can be evenly spaced in the receiving cavity 130. The specific spacing distance can be set according to the number and size of the battery cells 500. Thus, when a certain area of ​​the battery cell 500 leaks liquid, it can be detected in time.

[0095] The specific structure of the explosion-proof valve 200 will be described below.

[0096] Figure 5 This is a schematic diagram of the structure of the explosion-proof valve in the battery pack provided in the embodiments of this application. Figure 6 for Figure 5 A schematic diagram of the internal structure.

[0097] See Figure 3 , Figure 5 and Figure 6 As shown, the explosion-proof valve 200 includes a housing 220 and a sealing ring 230. The housing 220 is connected to the outer surface of the housing 100, and the sealing ring 230 is disposed between the housing 220 and the housing 100.

[0098] Specifically, the outer shell 220 has a mounting lug 221, and the mounting lug 221 has a first mounting hole 2211. The outer surface of the side plate 122 of the housing 100 has a second mounting hole (not shown in the figure). The first fastener 210 passes through the first mounting hole 2211 and the second mounting hole to connect the explosion-proof valve 200 and the housing 100. The sealing ring 230 is located between the outer shell 220 and the housing 100. The sealing ring 230 is deformed after being compressed by the outer shell 220 and the housing 100. The sealing ring 230 can play a sealing role between the outer shell 220 and the housing 100 by relying on the rebound effect of the deformation of the sealing ring 230.

[0099] Please continue reading Figure 5 and Figure 6 As shown, the explosion-proof valve 200 also includes an explosion-proof disc 240, and the housing 220 includes a housing body 222 and a housing cover 223. The explosion-proof disc 240 and the housing cover 223 are disposed on opposite sides of the housing body 222, with the explosion-proof disc 240 facing the outer surface of the housing 100.

[0100] The explosion-proof sheet 240 can be made of aluminum. When the gas pressure in the receiving cavity 130 is too high, the overpressure gas pushes open the explosion-proof sheet 240 and the cover 223 through the opening 310 of the liquid collection tank 300 and the exhaust port 110, and is discharged from the explosion-proof valve 200 to the outside of the battery pack.

[0101] Please continue reading Figure 5 and Figure 6 As shown, the explosion-proof valve 200 also includes an elastic element 250, one end of which abuts against the housing cover 223, and the other end of which abuts against the explosion-proof plate 240.

[0102] The pressurized gas applies pressure to the explosion-proof disc 240 of the explosion-proof valve. The explosion-proof disc 240 transmits the pressure to the cover 223 through the elastic element 250, so as to open the cover 223 and form an exhaust channel to discharge the overpressurized gas in the receiving cavity 130.

[0103] This application also provides an electrical device, including a battery pack as described in the above embodiments. The structure of the battery pack has been described in detail in the above embodiments and will not be repeated here. The battery pack is used to supply power to the electrical device, which may include one battery pack or multiple battery packs.

[0104] Electrical equipment can be vehicles, aircraft, ferries, computers, or energy storage cabinets that use battery packs for power. Vehicles can be electric vehicles (EVs), pure electric vehicles (PEVs / BEVs), hybrid electric vehicles (HEVs), range-extended electric vehicles (REEVs), plug-in hybrid electric vehicles (PHEVs), or new energy vehicles.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, include: The housing (100) has a receiving cavity (130) inside, which is used to receive the battery cell (500); the housing has an exhaust port (110) and a liquid collection tank (300); An explosion-proof valve (200) is provided at the exhaust port (110); The vent (110) is connected to the receiving cavity (130), and the liquid collection tank (300) is connected to the vent (110); A first immersion sensor (400) is disposed in the liquid collection tank (300) and is used to detect whether there is liquid in the liquid collection tank (300).

2. The battery pack according to claim 1, characterized in that, The housing (100) includes a bottom plate (121) and a side plate (122), the bottom plate (121) and the side plate (122) enclosing the receiving cavity (130), the side plate (122) having the exhaust port (110), the explosion-proof valve (200) being connected to the side plate (122), and the liquid collection tank (300) being located in the receiving cavity (130).

3. The battery pack according to claim 2, characterized in that, The housing (100) also includes a connecting wall (320), which surrounds the exhaust port (110) and is connected to the side plate (122). The connecting wall (320) and the side plate (122) together form the liquid collection tank (300), which is in communication with the receiving cavity (130).

4. The battery pack according to claim 3, characterized in that, The connecting wall (320) includes a side wall (322), which is disposed opposite to the vent (110), and the first immersion sensor (400) is connected to the side wall (322).

5. The battery pack according to claim 4, characterized in that, It also includes a connector (323) through which the first immersion sensor (400) is connected to the sidewall (322).

6. The battery pack according to claim 4, characterized in that, The connecting wall (320) also includes a bottom wall (321), and the side wall (322) is connected to the periphery of the bottom wall (321). The bottom wall (321), the side wall (322) and the side plate (122) enclose the liquid collection tank (300).

7. The battery pack according to claim 4, characterized in that, There is a first gap between the first immersion sensor (400) and the bottom surface of the liquid collection tank (300).

8. The battery pack according to claim 3, characterized in that, The liquid collection tank (300) has an opening (310) facing away from the bottom plate (121), and the opening (310) communicates with the receiving cavity (130).

9. The battery pack according to any one of claims 1 to 8, characterized in that, The battery pack also includes a battery manager (600). The first immersion sensor (400) includes a first sensor body (410) and a first lead (420). The first sensor body (410) is disposed in the liquid collection tank (300). One end of the first lead (420) is electrically connected to the first sensor body (410), and the other end of the first lead (420) extends outside the liquid collection tank (300) to be electrically connected to the battery manager (600).

10. The battery pack according to any one of claims 1 to 8, characterized in that, It also includes the battery cell (500) and at least one second immersion sensor (700), both of which are located within the receiving cavity (130); The second immersion sensor (700) is used to detect whether there is liquid in the containment cavity (130).

11. The battery pack according to claim 10, characterized in that, The battery pack also includes a battery manager (600), and the second immersion sensor (700) includes a second sensor body (710) and a second lead (720), one end of the second lead (720) is electrically connected to the second sensor body (710), and the other end of the second lead (720) is electrically connected to the battery manager (600).

12. The battery pack according to claim 10, characterized in that, There are multiple second immersion sensors (700), and the multiple second immersion sensors (700) are arranged at intervals.

13. The battery pack according to any one of claims 1 to 8, characterized in that, The explosion-proof valve (200) includes a housing (220) and a sealing ring (230). The housing (220) is connected to the outer surface of the housing (100), and the sealing ring (230) is disposed between the housing (220) and the housing (100).

14. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 13.

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