Sealing nail, battery cell, battery pack and electric equipment

Abstract

The utility model discloses a sealing nail, a battery cell, a battery pack and electric equipment, the sealing nail is used for sealing a liquid injection hole in the battery cell, and the sealing nail comprises a containing cavity, a sealing part and at least one sensor; the containing cavity is provided with a first end and a second end which are opposite, and the second end is provided with an air inlet. The sealing part is arranged at the second end of the containing cavity and used for stretching into the liquid injection hole so as to seal the liquid injection hole, and an air inlet channel is formed in the sealing part and connected with the air inlet hole; and the at least one sensor is arranged in the accommodating cavity and is used for acquiring state information in the battery cell. According to the invention, the state information in the battery cell can be obtained through the sensor arranged in the accommodating cavity of the sealing nail, so that the internal environment of the battery cell can be monitored on the premise of not changing the structure of the battery cell, the manufacturing cost of the battery cell can be reduced, and adverse effects on the performance of the battery cell are avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically to a sealing nail, a battery cell, a battery pack and an electrical device. Background Art

[0002] Battery safety issues have gradually become a focus of attention in the field. Real-time monitoring of the battery's internal closed environment under working conditions through built-in sensors is the key to ensuring stable battery operation.

[0003] In the related art, the sensor is built into the battery, and in order to build the sensor into the battery, the battery structure (for example, the spatial layout inside the battery) needs to be changed to make the installation position of the sensor compatible with the battery structure. This method increases the manufacturing cost of the battery and is likely to have an adverse effect on the battery performance.

[0004] In view of the above-mentioned technical problems, the present application provides a new sealing nail, battery cell, battery pack and electrical equipment. Utility Model Content

[0005] The present application is proposed to solve at least one of the above problems. According to one aspect of the present application, a sealing nail is provided, the sealing nail is used to seal the injection hole on the battery cell, the sealing nail comprises: a accommodating cavity, the accommodating cavity has a first end and a second end opposite to each other, the second end has an air inlet hole; a sealing portion, arranged at the second end of the accommodating cavity, used to extend into the injection hole to seal the injection hole, an air inlet channel is arranged in the sealing portion, the air inlet channel is connected to the air inlet hole; at least one sensor, arranged in the accommodating cavity, used to obtain the internal status information of the battery cell.

[0006] In some embodiments of the present application, a waterproof and breathable membrane is provided between the air inlet channel and the air inlet hole.

[0007] In some embodiments of the present application, the size of the waterproof breathable membrane is larger than the size of the air inlet hole.

[0008] In some embodiments of the present application, a signal transmission module is further provided in the accommodating cavity, the signal transmission module is electrically connected to the sensor, and the signal transmission module is used to send the status information to the outside world.

[0009] In some embodiments of the present application, there are multiple sensors, a circuit board is also disposed in the accommodating cavity, and the signal transmission module and the multiple sensors are integrated on the same circuit board.

[0010] In some embodiments of the present application, a positioning hole is provided on the circuit board, a positioning piece is provided at the first end of the accommodating cavity, and the circuit board is assembled and connected to the accommodating cavity through the positioning hole and the positioning piece.

[0011] In some embodiments of the present application, the circuit board is fixed in the accommodating cavity through a potting layer.

[0012] In some embodiments of the present application, the at least one sensor includes at least one of the following: a pressure detection sensor, a temperature detection sensor, and a gas detection sensor.

[0013] In some embodiments of the present application, the sealing portion is in a truncated cone shape, and the diameter of the truncated cone gradually decreases along the direction from the first end of the accommodating cavity toward the second end of the accommodating cavity.

[0014] In some embodiments of the present application, the accommodating cavity includes an air chamber and an elastic covering layer covering the air chamber.

[0015] In some embodiments of the present application, the sealing nail further includes a sealing cap, and the sealing cap is disposed at the first end of the accommodating cavity.

[0016] According to another aspect of the present application, a battery cell is provided, the battery cell comprising a liquid injection hole and a sealing nail as described in any one of the above, wherein the sealing nail is arranged in the liquid injection hole.

[0017] In some embodiments of the present application, the injection hole is arranged on the battery cell cover plate of the battery cell, and / or the injection hole is arranged on the side wall of the battery cell.

[0018] According to another aspect of the present application, a battery pack is provided, comprising any one of the battery cells described above.

[0019] According to another aspect of the present application, there is provided an electrical device comprising the above-mentioned battery pack.

[0020] According to the sealing pin, battery cell, battery pack and electrical equipment of the embodiments of the present application, after the sealing pin is assembled into the liquid injection hole of the battery cell, the internal status information of the battery cell can be obtained by the sensor arranged in the accommodating cavity of the sealing pin, thereby enabling the monitoring of the internal environment of the battery cell without changing the battery cell structure, which can reduce the manufacturing cost of the battery cell and will not adversely affect the performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0022] Figure 1 A schematic structural diagram of a sealing pin provided according to an embodiment of the present application is shown.

[0023] Figure 2 A partial exploded schematic diagram of a sealing pin provided according to an embodiment of the present application is shown.

[0024] Figure 3 A schematic structural diagram showing a circuit board, a sensor and a signal transmission module integrated on an air chamber upper cover according to an embodiment of the present application is shown.

[0025] Figure 4 A schematic diagram showing a sealing nail according to an embodiment of the present application used to seal a liquid injection hole on a battery cell.

[0026] In the attached figure:

[0027] 100 Sealing nails;

[0028] 110 accommodating cavity;

[0029] 111 elastic covering;

[0030] 112 air chamber;

[0031] 1121 air chamber cover;

[0032] 1122 Air chamber lower cover;

[0033] 113 air intake;

[0034] 120 sealing part;

[0035] 121 air intake passage;

[0036] 130 sealing cap;

[0037] 141 Circuit board;

[0038] 142 positioning hole;

[0039] 151 pressure detection sensor;

[0040] 152 temperature detection sensor;

[0041] 153 Gas detection sensor;

[0042] 154 signal transmission module;

[0043] 160 waterproof breathable membrane;

[0044] 170 perfusion layer;

[0045] 211 injection hole;

[0046] 212 grooves. DETAILED DESCRIPTION

[0047] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0048] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0049] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0050] Spatially relative terms such as "under," "below," "below," "under," "above," "above," etc., may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, the spatially relative terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0051] In order to thoroughly understand the present application, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present application. The preferred embodiments of the present application are described in detail as follows, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0052] Reference below Figure 1 and Figure 2 A sealing nail 100 according to an embodiment of the present application is described. The sealing nail 100 provided in the embodiment of the present application is used to seal the injection hole on the battery cell, and the sealing nail 100 includes: a accommodating cavity 110, the accommodating cavity 110 has a first end and a second end opposite to each other, and the second end has an air inlet hole 113; a sealing portion 120, which is arranged at the second end of the accommodating cavity 110 and is used to extend into the injection hole to seal the injection hole, and an air inlet channel 121 is arranged in the sealing portion 120, and the air inlet channel 121 is connected to the air inlet hole 113; at least one sensor, which is arranged in the accommodating cavity 110 and is used to obtain the internal state information of the battery cell.

[0053] Specifically, the sensor is disposed in the accommodating cavity 110 of the sealing pin 100. Figure 4 As shown, the sealing portion 120 of the sealing nail 100 can extend into the injection hole 211 on the battery cell, thereby sealing the injection hole 211 of the battery cell to prevent the electrolyte in the battery cell from leaking from the injection hole 211.

[0054] After the sealing nail 100 is assembled into the liquid injection hole 211 of the battery cell, the air inlet channel 121 in the sealing part 120 is connected to the internal environment of the battery cell. The air inlet channel 121 is connected to the air inlet hole 113 on the accommodating cavity 110. The gas components inside the battery cell can reach the sensor through the air inlet channel 121 and the air inlet hole 113 in turn, so that they can be detected by the sensor to obtain the status information inside the battery cell.

[0055] Based on this, the present application provides a sealing nail 100 with a sensor disposed inside. According to the sealing nail 100 of the present application, after the sealing nail 100 is assembled into the injection hole 211 of the battery cell, the state information inside the battery cell can be obtained through the sensor disposed in the accommodating cavity 110 of the sealing nail 100, so that the internal environment of the battery cell can be monitored without changing the structure of the battery cell, which can reduce the manufacturing cost of the battery cell without adversely affecting the performance of the battery cell.

[0056] It should be noted that in the present application, the size of the sealing pin 100 and the size of the accommodating cavity 110 are not limited. The size of the sealing pin 100 and the size of the accommodating cavity 110 can be designed according to the size of the injection hole 211 and the size of the sensor inside the accommodating cavity 110, and there is no limitation on this.

[0057] In some embodiments, Figure 1 As shown, the sealing nail 100 may further include a sealing cap 130, which is disposed at the first end of the accommodating cavity 110. The first end of the accommodating cavity 110 may be the air chamber upper cover 1121 hereinafter, that is, the sealing cap 130 may be connected to the air chamber upper cover 1121, and the accommodating cavity 110 may be located between the sealing cap 130 and the sealing portion 120.

[0058] The sealing cap 130 may be in various shapes, such as cylindrical, prism (such as hexagonal prism, octagonal prism, etc.), elliptical cylinder, etc., which are not limited thereto.

[0059] Taking the sealing cap 130 as a cylindrical shape, for example, the size of the sealing cap 130 can be consistent with the groove 212 (such as Figure 4 As shown in the figure, after the sealing portion 120 extends into the injection hole to seal the injection hole 211, the sealing cap 130 is just located in the groove 212, thereby playing a limiting role.

[0060] In some embodiments, the accommodating cavity 110 may be a single-layer structure or a multi-layer structure, which is not limited.

[0061] For example, Figure 2 As shown, the accommodating cavity 110 may include an air chamber 112 and an elastic covering layer 111 covering the air chamber 112 .

[0062] Among them, the interior of the air chamber 112 has a hollow space, and the sensor and devices such as the signal transmission module 154 and the circuit board 141 described below can be arranged in the hollow space of the air chamber 112. Accordingly, the air inlet hole 113 can be opened at the second end of the air chamber 112, and the second end of the air chamber 112 can be called the air chamber lower cover 1122, that is, the air inlet hole 113 can be opened at the air chamber lower cover 1122.

[0063] The air chamber 112 can be made of a rigid material, such as polytetrafluoroethylene, polyimide, ABS, etc. The rigid material can maintain the structural stability of the air chamber 112 and prevent the mechanical extrusion caused by the interference fit between the sealing pin 100 and the injection hole 211 when installing the sealing pin 100, which will damage the structural stability and connection stability of the sensor inside the air chamber 112 and the signal transmission module 154, circuit board 141 and other devices described below.

[0064] Furthermore, by coating the outer periphery of the air chamber 112 with an elastic coating layer 111 , the elastic coating layer 111 can buffer and protect the sensors inside the air chamber 112 and the signal transmission module 154 , circuit board 141 and other devices described below.

[0065] The material of the elastic covering layer 111 may be high elastic rubber or the like, which is not limited.

[0066] In some embodiments, when the number of sensors arranged in the accommodating cavity 110 is one, the sensor can be any one of the pressure detection sensor 151, the temperature detection sensor 152, and the gas detection sensor 153, or the sensor can also be other types of sensors, which is not limited.

[0067] Taking the example that the sensor disposed in the accommodating cavity 110 is the pressure detection sensor 151 , the pressure information inside the battery cell can be obtained through the pressure detection sensor 151 .

[0068] Among them, the pressure detection sensor 151 can be a capacitive pressure sensor (a capacitor composed of a metal film and a fixed electrode. The metal film deforms under the influence of pressure, which changes the current value of the capacitor and generates an output signal), a piezoresistive pressure sensor (which is constructed using the piezoresistive effect of a pressure-sensitive material. When the pressure changes, the pressure-sensitive material produces strain, causing the strain resistor directly diffused on it to produce a change proportional to the measured pressure, and then a corresponding voltage output signal is obtained by a bridge circuit), an inductive pressure sensor (an instrument that measures pressure by changing the inductance of an inductor coil), a strain pressure sensor (a pressure sensor that uses elastic sensitive elements and strain gauges to convert the measured pressure into a corresponding resistance value change), etc., without limitation.

[0069] Taking the example that the sensor disposed in the accommodating cavity 110 is the temperature detection sensor 152 , the temperature information inside the battery cell can be obtained through the temperature detection sensor 152 .

[0070] Among them, the temperature detection sensor 152 can be a thermistor temperature sensor (whose working principle is that the resistance of the metal film changes linearly with temperature, and the actual working temperature inside the battery can be reflected by measuring the resistance), a thermistor sensor (a sensor that uses the characteristics of semiconductor materials and the characteristics of PN junction to measure temperature), a thermocouple temperature sensor (a sensor that uses the thermoelectric effect to measure temperature), etc., without limitation.

[0071] Taking the case where the sensor disposed in the accommodating cavity 110 is the gas detection sensor 153 as an example, the gas information inside the battery cell can be obtained through the gas detection sensor 153, and the gas information may include gas composition, gas concentration, etc.

[0072] Among them, the gas detection sensor 153 can be a thermal conductivity gas sensor (whose working principle is that gases with different thermal conductivities have different thermal conductivity to thermistors to generate output signals), an infrared gas sensor (based on the near-infrared spectrum selective absorption characteristics of different gas molecules, a sensor that uses the relationship between gas concentration and absorption intensity to identify gas components and determine their concentrations), a semiconductor gas sensor (a sensor that uses metal oxide semiconductor materials and whose electrical conductivity changes with the change of ambient gas composition at a certain temperature), etc., without limitation.

[0073] In other embodiments, the number of sensors arranged in the accommodating cavity 110 may also be multiple, and the multiple sensors may include at least two of the above-mentioned pressure detection sensor 151, temperature detection sensor 152, and gas detection sensor 153, or may also include other types of sensors, which are not limited to this.

[0074] In some embodiments, Figure 2 As shown, in addition to the sensor, the accommodating cavity 110 may also be provided with a signal transmission module 154. The signal transmission module 154 is electrically connected to the sensor and can be used to send the internal state information of the battery cell obtained by the sensor to the outside world.

[0075] The outside world may refer to equipment with data analysis capabilities such as analyzers and central control consoles, and there is no limitation on this. After receiving the status information, the data analysis equipment can analyze the status information to determine the operating status of the battery cell, and realize in-situ monitoring of the safety of the battery cell and early warning of loss of control.

[0076] The signal transmission module 154 may be a wireless signal transmission module or a wired signal transmission module, which is not limited.

[0077] Taking the wireless signal transmission module as an example, the internal state information of the battery cell obtained by the sensor can be first transmitted to the wireless signal transmission module, and then the wireless signal transmission module sends it to the outside world through wireless transmission. For example, the wireless signal transmission module can be a Zigbee module, a WIFI module, a LoRa module, etc., which is not limited to this.

[0078] Taking the wired signal transmission module as an example, a hole can be opened on the first end of the accommodating cavity 110 and the sealing cap 130, and a wired signal transmission module such as a coaxial cable, a twisted pair, or an optical fiber can be inserted into the hole. One end of the coaxial cable, twisted pair, or optical fiber is inserted into the accommodating cavity 110 to be electrically connected to the sensor, and the other end is electrically connected to the outside world. The contact position between the cable and the hole on the sealing cap is sealed with resin to ensure the airtightness of the battery cell. The internal state information of the battery cell obtained by the sensor can be directly sent to the outside world through the cable. Compared with wireless transmission, wired transmission has a faster response time and a higher signal-to-noise ratio.

[0079] In some embodiments, Figure 2 As shown, the accommodating cavity 110 may also be provided with a circuit board 141, and the signal transmission module 154 and the sensor (which may be one sensor or multiple sensors) may be integrated on the same circuit board 141. By integrating the signal transmission module 154 and the sensor on the same circuit board 141, it is possible to optimize circuit design, reduce volume, save power consumption, and the like.

[0080] For example, Figure 2 A schematic diagram is shown in which a signal transmission module 154 and three sensors are integrated on a circuit board 141 . The three sensors may be a pressure detection sensor 151 , a temperature detection sensor 152 , and a gas detection sensor 153 , respectively.

[0081] It should be noted that the circuit board 141 can be fixedly disposed in the accommodating cavity 110 in a variety of ways, which are not limited thereto.

[0082] In some embodiments, Figure 2 As shown, a positioning hole 142 may be provided on the circuit board 141 , a positioning piece may be provided at the first end of the accommodating cavity 110 , and the circuit board 141 may be assembled and connected with the accommodating cavity 110 through the positioning hole 142 and the positioning piece.

[0083] For example, a positioning piece can be provided at the first end of the air chamber 112, that is, the air chamber upper cover 1121. The positioning piece can be a positioning pin, etc. Taking the positioning pin as an example, the circuit board 141 can cooperate with the positioning pin on the air chamber upper cover 1121 through the positioning hole 142 thereon, that is, the positioning pin can be inserted into the positioning hole 142, so as to fix the circuit board 141 on the air chamber upper cover 1121.

[0084] In other embodiments, Figure 2 As shown, the circuit board 141 may also be fixed in the accommodating cavity 110 via the potting layer 170 .

[0085] For example, the material of the infusion layer 170 can be a polymer such as epoxy resin, and the circuit board 141 can be fixedly arranged on the air chamber upper cover 1121 by means of polymer infusion. Exemplarily, a filling mold can be arranged on the inner surface of the air chamber upper cover 1121, and the circuit board 141 is arranged in the filling mold, and then the polymer material is injected into the filling mold, and the filling mold is removed after the polymer material is solidified, so that the infusion layer 170 is formed on the inner surface of the air chamber upper cover 1121, and the circuit board 141 is located in the infusion layer 170 and is fixedly connected with the air chamber upper cover 1121, and the components such as the sensor and the signal transmission module 154 on the circuit board 141 can be exposed from the surface of the infusion layer 170.

[0086] In some embodiments, Figure 1 As shown, a waterproof breathable membrane 160 may be provided between the air inlet channel 121 in the sealing portion 120 and the air inlet hole 113 at the second end of the accommodating cavity 110 .

[0087] In the related art, the sensor built into the battery cell is directly exposed to the internal environment of the battery cell. The sensor is in direct contact with the corrosive free electrolyte for a long time. The electrolyte will cause severe corrosion to the sensor and the connecting wires, causing the sensor to fail.

[0088] In this embodiment, the air chamber upper cover 1121 and the side wall are in a closed state, the air inlet 113 is opened in the air chamber lower cover 1122, and a waterproof breathable membrane 160 is arranged between the air inlet 113 and the air inlet channel 121. After the gas components inside the battery cell enter the air inlet channel 121, the waterproof breathable membrane 160 can allow the gas components inside the battery cell to enter the containing cavity 110 through itself while blocking the electrolyte inside the battery cell to prevent the electrolyte from entering the containing cavity 110, thereby protecting the sensors, signal transmission modules 154, circuit boards 141 and other devices in the containing cavity 110, and preventing the electrolyte from corroding the sensors, signal transmission modules 154, circuit boards 141 and other devices, thereby ensuring the longevity of the sensors, signal transmission modules 154, circuit boards 141 and other devices.

[0089] In addition, the presence of the waterproof breathable membrane 160 can also allow for special situations such as the battery cell tipping over or flipping over. In such special situations, the electrolyte will not enter the containing cavity 110, thereby extending the working life of components such as sensors, signal transmission modules 154 and circuit boards 141.

[0090] It should be noted that this embodiment does not limit the material of the waterproof breathable membrane 160. The material of the waterproof breathable membrane 160 can be adjusted with the composition of the electrolyte to prevent the waterproof breathable membrane 160 from being corroded by the electrolyte. For example, the material of the waterproof breathable membrane 160 can be polypropylene, polytetrafluoroethylene, nylon, etc.

[0091] In addition, the waterproof breathable membrane 160 can be arranged between the air inlet channel 121 and the air inlet hole 113 in a variety of ways, for example, it can be arranged between the air inlet channel 121 and the air inlet hole 113 by physical pressing, or it can be arranged between the air inlet channel 121 and the air inlet hole 113 by bonding, or other methods can be adopted, etc., which are not limited.

[0092] In addition, the size of the waterproof breathable membrane 160 should be larger than the size of the air inlet 113 so that the waterproof breathable membrane 160 can completely cover the air inlet 113 to ensure that the electrolyte does not enter the accommodating cavity 110 .

[0093] In some embodiments, Figure 1 As shown, the sealing portion 120 is in the shape of a truncated cone, and the diameter of the truncated cone gradually decreases along the direction from the first end of the accommodating cavity 110 to the second end of the accommodating cavity 110. That is, the sealing portion 120 can be configured as an inverted truncated cone. The inverted truncated cone design can increase the friction between the sealing portion 120 and the injection hole 211, and improve the sealing effect of the sealing portion 120 on the injection hole 211.

[0094] In addition, after the inverted truncated cone-shaped sealing portion 120 extends into the injection hole 211, an interference fit can be formed between the sealing portion 120 and the injection hole 211 to increase the resistance to the entry and exit of electrolyte or other foreign matter outside the battery cell, which is beneficial to further improve the sealing of the battery cell and the accuracy of sensor measurement.

[0095] According to another aspect of the present application, a battery cell is provided, the battery cell comprising a liquid injection hole and a sealing nail, wherein the sealing nail is arranged in the liquid injection hole.

[0096] Among them, the sealing nail can be implemented as the sealing nail 100 mentioned above, and reference can be made to the above introduction, which will not be repeated here.

[0097] After the sealing nail is installed in the injection hole, the sensor inside the sealing nail can detect the internal environment of the battery cell to obtain the internal state information of the battery cell, which may include at least one of pressure information, temperature information, and gas information, or may also include other information. The internal state information of the battery cell obtained by the sensor can be sent to an external data analysis device, which can analyze the state information to determine the operating state of the battery cell, realize in-situ monitoring of the safety of the battery cell and early warning of loss of control, etc.

[0098] In some embodiments, the injection hole can be provided on the cell cover of the cell. The electrolyte can be injected into the cell through the injection hole on the cell cover. After the injection is completed, a sealing nail can be provided in the injection hole on the cell cover to prevent leakage of the electrolyte.

[0099] In some embodiments, the injection hole can be provided on the side wall of the battery cell. The electrolyte can be injected into the battery cell through the injection hole on the side wall of the battery cell. After the injection is completed, a sealing nail can be provided in the injection hole on the side wall of the battery cell to prevent leakage of the electrolyte.

[0100] In some embodiments, a groove communicating with the injection hole may be further provided on one side of the injection hole. After the sealing portion of the sealing nail extends into the injection hole to seal the injection hole, the sealing cap of the sealing nail may be located in the groove, thereby playing a limiting role.

[0101] According to another aspect of the present application, a battery pack is provided, the battery pack including a battery cell.

[0102] Among them, the battery cell can be implemented as the battery cell mentioned above, and reference can be made to the introduction above, which will not be repeated here.

[0103] The number of cells in the battery pack may be one or more, and there is no limitation on this. When there are more than one cell, the cells may be connected in series or in parallel, or some of the cells may be connected in series and the other cells may be connected in parallel.

[0104] According to another aspect of the present application, an electrical device is provided, and the electrical device includes a battery pack.

[0105] Among them, the battery pack can be implemented as the battery pack mentioned above, and reference can be made to the introduction above, which will not be repeated here.

[0106] It should be noted that the electrical equipment mentioned above may include vehicles, ships, aircraft, energy storage equipment, etc., without limitation thereto.

[0107] To summarize, according to the sealing pin, battery cell, battery pack and electrical equipment of the embodiments of the present application, after the sealing pin is assembled into the liquid injection hole of the battery cell, the internal status information of the battery cell can be obtained by the sensor arranged in the accommodating cavity of the sealing pin, thereby enabling the monitoring of the internal environment of the battery cell without changing the battery cell structure, reducing the manufacturing cost of the battery cell and not adversely affecting the performance of the battery cell.

[0108] Moreover, by arranging a waterproof and breathable membrane between the air inlet channel and the air inlet hole, the waterproof and breathable membrane can allow the gas components inside the battery cell to enter the containing cavity through itself while blocking the electrolyte inside the battery cell to prevent the electrolyte from entering the containing cavity, thereby protecting the sensors, signal transmission modules, circuit boards and other devices in the containing cavity, preventing the electrolyte from corroding the sensors, signal transmission modules, circuit boards and other devices, and ensuring the long life operation of the sensors, signal transmission modules, circuit boards and other devices.

[0109] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0110] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various application aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the application point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0111] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0112] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be construed as a limitation to the claims. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A sealing nail, characterized in that: The sealing nail is used to seal the injection hole on the battery core, and the sealing nail includes: A containing cavity, the containing cavity having a first end and a second end opposite to each other, the second end having an air inlet hole; A sealing portion, disposed at the second end of the accommodating cavity, and used to extend into the liquid injection hole to seal the liquid injection hole, wherein an air intake channel is disposed in the sealing portion, and the air intake channel is connected to the air intake hole; At least one sensor is disposed in the accommodating cavity and is used to obtain status information inside the battery cell.

2. The sealing nail according to claim 1, characterized in that: A waterproof and breathable membrane is arranged between the air inlet channel and the air inlet hole.

3. The sealing nail according to claim 2, characterized in that: The size of the waterproof breathable membrane is larger than the size of the air inlet hole.

4. The sealing nail according to claim 1, characterized in that: A signal transmission module is also provided in the accommodating cavity. The signal transmission module is electrically connected to the sensor and is used to send the status information to the outside.

5. The sealing nail according to claim 4, characterized in that: There are multiple sensors, and a circuit board is also arranged in the accommodating cavity. The signal transmission module and the multiple sensors are integrated on the same circuit board.

6. The sealing nail according to claim 5, characterized in that: A positioning hole is provided on the circuit board, a positioning piece is provided at the first end of the accommodating cavity, and the circuit board is assembled and connected with the accommodating cavity through the positioning hole and the positioning piece.

7. The sealing nail according to claim 5, characterized in that: The circuit board is fixed in the accommodating cavity through a potting layer.

8. The sealing nail according to claim 1, characterized in that: The at least one sensor includes at least one of the following: a pressure detection sensor, a temperature detection sensor, and a gas detection sensor.

9. The sealing nail according to claim 1, characterized in that: The sealing portion is in a truncated cone shape, and the diameter of the truncated cone gradually decreases along the direction from the first end of the accommodating cavity to the second end of the accommodating cavity.

10. The sealing nail according to claim 1, characterized in that: The accommodating cavity comprises an air chamber and an elastic covering layer covering the air chamber.

11. The sealing nail according to claim 1, characterized in that: The sealing nail further comprises a sealing cap, and the sealing cap is arranged at the first end of the accommodating cavity.

12. A battery cell, characterized in that: The battery core comprises a liquid injection hole and a sealing nail according to any one of claims 1 to 11, wherein the sealing nail is arranged in the liquid injection hole.

13. The battery cell according to claim 12, characterized in that: The injection hole is arranged on the cell cover plate of the cell, and / or the injection hole is arranged on the side wall of the cell.

14. A battery pack, characterized in that: The invention comprises the battery cell as claimed in any one of claims 12 to 13.

15. An electrical equipment, characterized in that: Comprising the battery pack as claimed in claim 14.

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