Battery monomer, battery device, electric equipment and liquid injection device

Abstract

The utility model relates to a battery monomer, a battery device, electric equipment and a liquid injection device. The battery monomer comprises a shell, a first cylinder and a switch structure, the shell comprises a first wall, a liquid injection hole is formed in the first wall, the first cylinder is arranged on the first wall and surrounds the liquid injection hole, a mounting cavity is defined by the first cylinder and the first wall, and the mounting cavity is communicated with the liquid injection hole in the axis direction of the liquid injection hole; the switch structure is at least arranged in the mounting cavity. Wherein the switch structure is configured to be capable of switching between a closed state and an open state, and when the switch structure is in the closed state, the switch structure seals the mounting cavity; under the condition that the switch structure is in the open state, the switch structure opens the mounting cavity, so that the liquid injection hole is communicated with the external environment. The probability of fire catching caused by water inflow of the battery monomer can be reduced, the safety of the battery monomer can be improved, and the safety of the battery device and the electric equipment comprising the battery monomer can be further improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, electrical equipment, and electrolyte filling device. Background Technology

[0002] Due to their high energy density, long lifespan, and environmental friendliness, batteries are widely used in portable electronic products such as mobile phones, laptops, and digital cameras, and also have good application prospects in fields such as electric vehicles.

[0003] In related technologies, batteries include battery cells, which are at risk of catching fire after being infiltrated by water, resulting in low safety of battery cells. Utility Model Content

[0004] Therefore, it is necessary to provide a battery cell, battery device, electrical equipment, and liquid injection device to address the above problems, thereby improving the safety of the battery cell, battery device, and electrical equipment.

[0005] According to a first aspect of this application, a battery cell is provided, including a housing, a first cylinder, and a switch structure. The housing includes a first wall with an injection hole. The first cylinder is disposed on the first wall and surrounds the injection hole. The first cylinder and the first wall enclose a mounting cavity, which communicates with the injection hole along its axial direction. The switch structure is at least disposed within the mounting cavity. The switch structure is configured to switch between a closed state and an open state. When the switch structure is in the closed state, it closes the mounting cavity; when the switch structure is in the open state, it opens the mounting cavity to allow the injection hole to communicate with the external environment.

[0006] In the technical solution of this application, when it is necessary to inject electrolyte into a battery cell, the switch structure can be in the open state, thereby allowing the injection hole to be connected to the external fluid through the open switch structure, allowing the electrolyte from the external environment to be injected into the battery cell. After the electrolyte injection is completed, the switch structure can be in the closed state. In this way, the installation cavity can be sealed by the switch structure, and since the installation cavity is located upstream of the injection hole, the injection hole can also be sealed by the switch structure. This helps to prevent external water from entering the battery cell, reducing the probability of the battery cell catching fire due to water ingress, and improving the safety of the battery cell. In turn, it can improve the safety of the battery device and electrical equipment including the battery cell.

[0007] In one embodiment, the switch structure includes a first mounting member and a seal. The first mounting member is disposed within a mounting cavity and includes a fluid channel communicating with the mounting cavity. The seal is movably connected to the inner wall of the fluid channel to switch the switch structure from a closed state to an open state. When the switch structure is in the closed state, the seal is sealed to the side wall of the fluid channel. When the switch structure is in the open state, at least a portion of the seal is separated from the side wall of the fluid channel, and the injection port is connected to the external environment through the fluid channel. Before injecting electrolyte into the battery cell, at least a portion of the seal can be separated from the sidewall of the fluid channel, thereby opening the switch structure. At this time, the injection hole is connected to the external environment through the fluid channel, allowing electrolyte from the external environment to be injected into the battery cell. After the electrolyte injection is completed, the seal can be sealed to the sidewall of the fluid channel, thereby closing the switch structure. At this time, the switch structure closes the mounting cavity, which helps to prevent external water from entering the battery cell, thus improving the safety of the battery cell and the safety of the battery device and electrical equipment including the battery cell.

[0008] In one embodiment, the seal is movable relative to the inner wall of the fluid channel along the axial direction of the fluid channel to switch the switch structure from a closed state to an open state. The seal can be driven to move along the axial direction of the fluid channel to facilitate at least a portion of the seal separating from the sidewall of the fluid channel, thereby switching the switch structure from a closed state to an open state.

[0009] In one embodiment, along the axial direction of the injection hole, the first mounting member has a guide surface surrounding the fluid channel on the side away from the injection hole. Along the radial direction of the fluid channel, the guide surface has a first inner side and a first outer side disposed opposite to each other. Along the axial direction of the fluid channel, the first outer side of the guide surface is positioned closer to the injection hole than the first inner side. The guide surface can guide fluid (such as water from the external environment) out of the first mounting member, better preventing external water from entering the interior of the battery cell, thereby improving the safety of the battery cell and consequently enhancing the safety of the battery device and electrical equipment including the battery cell.

[0010] In one embodiment, the switch structure further includes a first limiting member, which is located on the side of the first mounting member near the injection hole and connected to the seal. This allows the switch structure to be in the open state under an inward driving force, but not under an outward driving force. This makes the switch structure function similarly to a one-way valve, reducing the possibility of accidental opening due to gas generation inside the battery cell, thereby improving the safety and reliability of the battery cell.

[0011] In one embodiment, the switch structure further includes an elastic element connected to both the first limiting element and the first wall. The elastic element provides space for the descent of the seal and can be driven by a certain external force to switch the switch structure from a closed state to an open state. After the external force is removed, the seal can be reset by the elastic restoring force of the elastic element, causing the switch structure to automatically switch from an open state to a closed state. This reduces the probability of internal water ingress into the battery cell after liquid injection, thereby improving the safety and reliability of the battery cell.

[0012] In one embodiment, the battery cell further includes a second cylinder, with the first and second cylinders respectively disposed on opposite sides of the first wall along the axial direction of the injection hole. The switch structure also includes a mounting base, which passes through the second cylinder. The end of the elastic element furthest from the first limiting member passes through the injection hole and is connected to the mounting base. Along the axial direction of the injection hole, the elastic element can be connected between the first limiting member and the mounting base, facilitating the contraction or extension of the elastic element along the axial direction of the injection hole. This allows the seal to move more stably along the axial direction of the fluid channel, improving the reliability of the switch structure.

[0013] In one embodiment, the mounting base includes a second mounting member, a support member, and at least one reinforcing member. The second mounting member is connected to the inner peripheral wall of the second cylinder, the support member is located inside the second mounting member, an elastic member is connected between the support member and a first limiting member, and at least one reinforcing member is connected between the support member and the second mounting member. This improves the reliability of the switch structure, and because at least one reinforcing member is connected between the support member and the second mounting member, it also improves the strength and reliability of the mounting base.

[0014] In one embodiment, the switch structure further includes a blocking sleeve connected to the side of the first limiting member near the injection hole, and forming a receiving groove with the first limiting member to at least partially accommodate the elastic member. The end of the elastic member away from the first limiting member passes through the injection hole and the opening of the receiving groove, and is connected to the mounting base. The blocking sleeve can protect the elastic member, reducing the possibility of the injected electrolyte coming into contact with the elastic member, thereby improving the service life and reliability of the elastic member.

[0015] In one embodiment, when the switch structure is in the open state, the blocking sleeve abuts against the mounting base, and the mounting base seals the opening of the receiving groove. During the liquid injection process, because the mounting base seals the opening of the receiving groove, the elastic element can be sealed inside the receiving groove, thereby better preventing the elastic element from contacting the injected electrolyte, and thus better improving the service life and reliability of the elastic element.

[0016] In one embodiment, the central axis of the second cylinder coincides with the central axis of the injection hole. This facilitates stable movement of the seal along the axial direction of the fluid channel, improving the reliability of the switching structure.

[0017] In one embodiment, the first wall and the second cylinder are integrally formed. This increases the strength of the casing while reducing the number of components required for casing assembly, thereby improving the production efficiency of the battery cell.

[0018] In one embodiment, along the axial direction of the first cylinder, the side of the first cylinder furthest from the injection hole is positioned further away from the injection hole than the side of the seal furthest from the injection hole. It is understood that having the seal completely within the mounting cavity reduces the possibility of the seal being squeezed by external objects, thereby reducing the likelihood of the switch structure being accidentally opened and improving the reliability of the switch structure.

[0019] In one embodiment, the first cylinder is provided with an overflow channel communicating with the mounting cavity, and the seal is provided with a guide groove communicating with the overflow channel. Fluid (such as water) remaining inside the first cylinder can flow to the overflow channel through the guide groove, and then be discharged outside the switch structure through the overflow channel, reducing the accumulation of water inside the first cylinder, thereby reducing the probability of battery cells catching fire due to water ingress.

[0020] In one embodiment, the guide channel extends radially along the first cylinder. The guide channel can guide the accumulated water to flow generally radially along the first cylinder towards the overflow channel, facilitating the drainage of the accumulated water.

[0021] In one embodiment, the seal has multiple guide grooves spaced apart around the central axis of the first cylinder on the side away from the injection hole. This facilitates the faster drainage of fluid (such as water) remaining inside the first cylinder using multiple guide grooves.

[0022] In one embodiment, the seal includes a main body and an edge portion surrounding the main body. A guide groove is formed in the main body, and the edge portion guides fluid within the guide groove to an overflow channel. As fluid remaining inside the first cylinder (such as accumulated water) flows through the guide groove to the overflow channel, the downwardly inclined edge portion quickly guides the fluid within the guide groove to the overflow channel. This reduces the accumulation of water inside the first cylinder, thereby lowering the probability of the battery cell catching fire due to water ingress, improving the safety of the battery cell, and consequently enhancing the safety of the battery device and electrical equipment including the battery cell.

[0023] In one embodiment, when the switch structure is in the closed state, along the axial direction of the first cylinder, the edge of the seal is positioned further away from the injection hole than the side of the first mounting member that is farther from the injection hole. Taking the top wall of the housing as an example, it can be understood that the height of the edge of the seal is higher than the height of the first mounting member. This improves the sealing performance between the seal and the inner wall of the fluid channel, thereby reducing the probability of the battery cell catching fire due to water ingress and improving the safety of the battery cell.

[0024] In one embodiment, along the axial direction of the first cylinder, the outer edge of the first mounting member is positioned further away from the filling hole than the side of the overflow channel closer to the filling hole. This allows water accumulated on the first mounting member to flow out through the lower overflow channel, reducing water accumulation inside the first cylinder and thus improving the safety of the battery cell.

[0025] In one embodiment, the first cylinder is provided with an overflow channel communicating with the mounting cavity. In this way, fluid (such as water) remaining inside the first cylinder can be discharged through the overflow channel, thereby reducing the probability of the battery cell catching fire due to water ingress, which is beneficial to improving the safety of the battery cell, and thus improving the safety of the battery device and electrical equipment including the battery cell.

[0026] In one embodiment, the first cylinder includes a first portion and a second portion spaced apart along the axial direction of the first cylinder, and a plurality of connecting portions connecting the first portion and the second portion. The plurality of connecting portions are spaced apart around the central axis of the first cylinder, and an overflow channel is defined between two adjacent connecting portions. Fluid (such as water) remaining inside the first cylinder can be discharged through the plurality of overflow channels, which can better reduce the probability of battery cells catching fire due to water ingress, and is beneficial to improving the safety of battery cells.

[0027] In one embodiment, a drainage surface is provided on the first wall, surrounding the injection hole and located between the injection hole and the first cylinder. Along the radial direction of the injection hole, the drainage surface has a second inner side and a second outer side disposed opposite to each other. Along the axial direction of the injection hole, the second outer side of the drainage surface is disposed further away from the injection hole than the second inner side. Thus, the drainage surface is inclined and serves to guide the electrolyte into the injection hole, reducing the possibility of electrolyte residue remaining on the drainage surface.

[0028] In one embodiment, the central axis of the first cylinder coincides with the central axis of the injection hole. This facilitates the uniform application of external force to the switch structure, thereby improving the stability of the seal's movement along the axial direction of the injection hole and ultimately enhancing the reliability of the switch structure.

[0029] In one embodiment, the first wall and the first cylinder are integrally formed. This improves the strength of the casing while reducing the number of components required for casing assembly, thereby increasing the production efficiency of the battery cell.

[0030] According to a second aspect of this application, a battery device is provided, comprising a battery cell of any of the above embodiments.

[0031] According to a third aspect of this application, an electrical device is provided, including the battery device described above.

[0032] According to a fourth aspect of this application, a liquid injection device is provided, applied to a battery cell in any of the above embodiments. The liquid injection device includes a liquid injection nozzle having a liquid injection channel, and the liquid injection nozzle is used to drive a switch structure from a closed state to an open state, thereby enabling the liquid injection channel to communicate with the liquid injection hole. The liquid injection nozzle can drive the switch structure from a closed state to an open state, enabling the liquid injection channel to communicate with the liquid injection hole, thus allowing the liquid injection device to perform liquid injection operations on the battery cell.

[0033] In one embodiment, along the axial direction of the injection channel, the end of the injection nozzle where the injection channel outlet is located is recessed inward. The end of the injection nozzle where the injection channel outlet is located can form an outlet groove that communicates with both the injection channel and the injection hole. This facilitates the discharge of electrolyte from the injection nozzle through the outlet groove, reducing the likelihood of the injection nozzle becoming blocked when pressed downwards, thus minimizing electrolyte obstruction and facilitating the injection of electrolyte from the injection nozzle into the battery cell through the injection hole.

[0034] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0036] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of this application is shown.

[0037] Figure 2 A partial structural schematic diagram of a battery cell according to an embodiment of this application is shown.

[0038] Figure 3 It shows Figure 2 An enlarged schematic diagram of point A.

[0039] Figure 4 A schematic diagram of a switch structure according to an embodiment of this application is shown (when the switch structure is in the closed state).

[0040] Figure 5 A schematic diagram of a switch structure according to an embodiment of this application is shown (when the switch structure is in the open state).

[0041] Figure 6 It shows Figure 5 An enlarged schematic diagram of point B.

[0042] Figure 7 It shows Figure 2 A magnified view of a portion of the image.

[0043] Reference numerals: 1. Vehicle; 10. Battery assembly;

[0044] 100. Battery cell; 110a. Top cover; 110. First wall; 111. Drainage surface; 120. First cylinder; 121. First part; 122. Second part; 123. Connecting part; 130. Switch structure;

[0045] 131. First mounting component; 1311. Guide surface; 132. Seal; 1321. Main body; 1322. Edge; 133. First limiting component; 134. Elastic component; 135. Mounting base; 1353. Reinforcing component; 1352. Support component; 1351. Second mounting component; 136. Blocking sleeve;

[0046] 140. The second tube;

[0047] 150. Explosion-proof valve; 160. Fastening plate; 161. Locking component; 162. Plate body;

[0048] 200, Injection nozzle; K, Injection hole; Q, Mounting cavity; J, Fluid channel; C, Receiving tank; Y, Overflow channel; H, Guide groove; Z, Injection channel; R, Discharge tank;

[0049] 20. Motor; 30. Controller. Detailed Implementation

[0050] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0051] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0052] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0056] Because of their high energy density, long lifespan, and environmental friendliness, lithium-ion batteries are widely used in portable electronic products such as mobile phones, laptops, and digital cameras, and also have good application prospects in fields such as electric vehicles.

[0057] In related technologies, it is usually necessary to inject liquid into the battery cell through the injection hole. However, after the liquid injection is completed and before the injection hole is sealed, there is a risk of water entering the battery cell and causing it to catch fire, resulting in low safety of the battery cell.

[0058] To improve the safety of individual battery cells, this application designs a battery cell, a battery device, an electrical appliance, and a liquid injection device. After liquid injection, the liquid injection hole of the battery cell is kept closed, thereby reducing the probability of the battery cell catching fire due to water ingress and improving the safety of the battery cell. This, in turn, improves the safety of the battery device and electrical appliance including the battery cell.

[0059] The battery cells and / or battery devices disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. The power system for this electrical device can be composed of the electrodes, electrode assemblies, battery cells, and / or batteries disclosed in this application. This facilitates providing power to the electrical device and also extends its service life.

[0060] Figure 1This illustration shows a structural diagram of a vehicle 1 according to an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation of vehicle 1. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1 but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving force for vehicle 1.

[0061] The interior of vehicle 1 may also be equipped with a motor 20 and a controller 30. The controller 30 is used to control the power supply of the battery device 10 to the motor 20, for example, for the power needs of vehicle 1 during starting, navigation and driving.

[0062] The battery device 10 includes at least one battery cell 100.

[0063] To meet different power demands, the battery device 10 may include multiple battery cells 100, where a battery cell 100 is the smallest unit constituting the battery device 10. Multiple battery cells 100 can be connected in series and / or in parallel via electrode terminals for various applications. The battery device 10 mentioned in this application includes a battery module or a battery pack. Multiple battery cells 100 can be connected in series, parallel, or a combination thereof; a combination of series and parallel connections refers to a mix of both. The battery device 10 may also be referred to as a battery pack. In the embodiments of this application, multiple battery cells 100 can directly form a battery pack, or they can first be formed into battery modules, and then the battery modules can be assembled into a battery pack.

[0064] The battery device 10 may also include multiple battery cells 100 and a housing. The housing is used to house the battery cells 100 to prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 100. The housing may be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or it may be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. This application embodiment is not limited in this regard. The material of the housing may be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. This application embodiment is also not limited in this regard.

[0065] Figure 2 A partial structural schematic diagram of a battery cell according to an embodiment of this application is shown. Figure 3 It shows Figure 2An enlarged diagram of point A. Figure 4 A schematic diagram of a switch structure according to an embodiment of this application is shown.

[0066] Please see Figures 2-4 One embodiment of this application provides a battery cell 100, including a housing, a first cylinder 120, and a switch structure 130.

[0067] The housing includes a first wall 110, on which a liquid injection hole K is provided. A first cylinder 120 is disposed on the first wall 110 and arranged around the liquid injection hole K. The first cylinder 120 and the first wall 110 enclose an installation cavity Q. Along the axial direction of the liquid injection hole K, the installation cavity Q is connected to the liquid injection hole K. The switch structure 130 is at least disposed in the installation cavity Q.

[0068] Specifically, along the axial direction of the injection hole K, the mounting cavity Q is connected to the upstream side of the injection hole K.

[0069] The switch structure 130 is configured to switch between a closed state and an open state. When the switch structure 130 is in the closed state, the switch structure 130 closes the mounting cavity Q.

[0070] When the switch structure 130 is in the open state, the switch structure 130 opens the mounting cavity Q so that the injection hole K can communicate with the external environment.

[0071] In other words, the injection port K can be connected to the external environment through the switch structure 130 which is in the open state.

[0072] The casing refers to the component on the battery cell 100 used to house the electrode assembly and electrolyte of the battery cell 100.

[0073] The first wall 110 can be the top wall of the shell or the bottom wall of the shell; no specific limitation is made here. For example, the shell includes a top cover 110a, and the first wall 110 is disposed on the top cover 110a.

[0074] The electrolyte injection hole K refers to the hole that penetrates the first wall 110 and is used to inject electrolyte into the shell.

[0075] The first cylinder 120 refers to the cylindrical component disposed on the first wall 110 and surrounding the injection hole K.

[0076] The mounting cavity Q is a cavity defined by the first cylinder 120 and the first wall 110, and is used to mount the switch structure 130.

[0077] The switch structure 130 refers to a structure that can be operablely switched between an open state and a closed state. When in the open state, the switch structure 130 can connect the injection port K to the external environment; conversely, when in the closed state, it can block the injection port K from the external environment. The switch structure 130 can be a one-way valve or other similar structures; no specific limitations are specified here.

[0078] When electrolyte needs to be injected into the battery cell 100, the switch structure 130 can be opened, allowing the injection hole K to be connected to the external fluid via the open switch structure 130, enabling the electrolyte from the external environment to be injected into the battery cell 100. After the electrolyte injection is completed, the switch structure 130 can be closed, thus sealing the mounting cavity Q. Since the mounting cavity Q is located upstream of the injection hole K, the switch structure 130 can also be used to seal the injection hole K, which helps to prevent external water from entering the battery cell 100, reducing the probability of the battery cell 100 catching fire due to water ingress, improving the safety of the battery cell 100, and consequently improving the safety of the battery device 10 and electrical equipment including the battery cell 100.

[0079] In some embodiments, the switch structure 130 includes a first mounting member 131 and a seal member 132. The first mounting member 131 is disposed in the mounting cavity Q and includes a fluid channel J communicating with the mounting cavity Q. The seal member 132 is movably connected to the inner wall of the fluid channel J so that the switch structure 130 is switched from a closed state to an open state.

[0080] When the switch structure 130 is in the closed state, the seal 132 is sealed to the side wall of the fluid channel J; when the switch structure 130 is in the open state, at least a portion of the seal 132 is separated from the side wall of the fluid channel J, and the injection hole K is connected to the external environment through the fluid channel J.

[0081] The first mounting component 131 refers to a component used for installation in the mounting cavity Q and for defining the fluid passage J. The first mounting component 131 can be an annular component, that is, the first mounting component 131 can be a first mounting ring.

[0082] The first mounting component 131 can be snapped into the mounting cavity Q, or it can be threaded to the inner wall of the mounting cavity Q, so that the first mounting component 131 can be installed in the mounting cavity Q.

[0083] Seal 132 refers to a component used to seal the sidewall of the fluid channel J and capable of being at least partially separated from the sidewall of the fluid channel J.

[0084] The material of the seal 132 can be rubber or other materials that enable the seal 132 to be sealed to the side wall of the fluid channel J.

[0085] Fluid channel J refers to a channel provided on the first mounting component 131 for the passage of fluids such as electrolyte.

[0086] Before injecting electrolyte into the battery cell 100, at least a portion of the seal 132 can be separated from the sidewall of the fluid channel J, thereby allowing the switch structure 130 to be in the open state. At this time, the injection hole K is connected to the external environment through the fluid channel J, allowing electrolyte from the external environment to be injected into the battery cell 100. After the electrolyte injection is completed, the seal 132 can be sealed to the sidewall of the fluid channel J, thereby allowing the switch structure 130 to be in the closed state. At this time, the switch structure 130 closes the mounting cavity Q, which helps to prevent external water from entering the interior of the battery cell 100, thereby improving the safety of the battery cell 100, and thus improving the safety of the battery device 10 and electrical equipment including the battery cell 100.

[0087] In some embodiments, the seal 132 can move along the axial direction of the fluid channel J to switch the switch structure 130 from a closed state to an open state.

[0088] Alternatively, the seal 132 may be slidably connected to the side wall of the fluid channel J along the axial direction of the fluid channel J, thereby facilitating the operable driving of the seal 132 to move relative to the inner side wall of the fluid channel J along the axial direction of the fluid channel J, so that the switch structure 130 is switched from the closed state to the open state.

[0089] Alternatively, the seal 132 may be provided on the side wall of the fluid channel J by means of a spring that extends along the axial direction of the fluid channel J, thereby driving the seal 132 to move along the axial direction of the fluid channel J, so that the switch structure 130 switches from the closed state to the open state.

[0090] In either case, the seal 132 can be driven to move along the axial direction of the fluid channel J, so that at least a portion of the seal 132 can be separated from the sidewall of the fluid channel J, thereby switching the switch structure 130 from the closed state to the open state.

[0091] In some embodiments, along the axial direction of the injection hole K, the first mounting member 131 has a guide surface 1311 disposed around the fluid channel J on the side away from the injection hole K. Along the radial direction of the fluid channel J, the guide surface 1311 has a first inner side and a first outer side disposed opposite to each other; along the axial direction of the fluid channel J, the first outer side of the guide surface 1311 is disposed closer to the injection hole K than the first inner side.

[0092] The guide surface 1311 refers to the surface provided on the first mounting member 131 and used to guide the fluid to flow out of the first mounting member 131.

[0093] Taking the first wall 110 as the top wall of the shell as an example, the first cylinder 120 and the first mounting part 131 are located on the top side of the injection hole K. Therefore, along the axial direction of the injection hole K, the height of the first outer side of the guide surface 1311 is lower than the height of the first inner side of the guide surface 1311.

[0094] Thus, if fluid (such as water from the external environment) flows to the switch structure 130 in the closed state, this fluid can flow along the guide surface 1311 and from the first inner side of the guide surface 1311 to the first outer side of the guide surface 1311, guiding this fluid out of the first mounting member 131. This can better prevent external water from entering the interior of the battery cell 100, thereby improving the safety of the battery cell 100 and the safety of the battery device 10 and electrical equipment including the battery cell 100.

[0095] In some embodiments, the switch structure 130 further includes a first limiting member 133, which is located on the side of the first mounting member 131 near the injection hole K and is connected to the sealing member 132.

[0096] The first limiting member 133 refers to the component that is located on the side of the first mounting member 131 near the injection hole K and is connected to the sealing member 132. The first limiting member 133 can be a ring structure.

[0097] The first limiting member 133 can be bonded to the sealing member 132.

[0098] Since the first limiting member 133 is located on the side of the first mounting member 131 near the injection hole K and is connected to the sealing member 132, the first limiting member 133 can be used to restrict the sealing member 132 from disengaging from the fluid channel J along the axial direction of the injection hole K. This allows the switch structure 130 to be in the open state under the driving force from the outside in, and not in the open state under the driving force from the inside out. This makes the switch structure 130 function like a one-way valve, which can reduce the situation of accidental opening due to gas generation inside the battery cell 100, thereby improving the safety and reliability of the battery cell 100.

[0099] In some embodiments, the switch structure 130 further includes an elastic element 134, which is connected to the first limiting element 133 and the first wall 110 respectively.

[0100] The elastic element 134 can be a spring or other elastic element besides a spring.

[0101] Thus, the elastic element 134 provides space for the descent of the seal 132, and can drive the seal 132 under a certain external force to switch the switch structure 130 from the closed state to the open state. After the external force is removed, the seal 132 can be reset under the elastic restoring force of the elastic element 134, so that the switch structure 130 automatically switches from the open state to the closed state. In this way, the probability of water entering the battery cell 100 after the liquid filling operation can be reduced, thereby improving the safety and reliability of the battery cell 100.

[0102] In some embodiments, the battery cell 100 further includes a second cylinder 140. The first cylinder 120 and the second cylinder 140 are respectively disposed on opposite sides of the first wall 110 along the axial direction of the injection hole K. The switch structure 130 further includes a mounting base 135, which passes through the second cylinder 140. The end of the elastic member 134 away from the first limiting member 133 passes through the injection hole K and is connected to the mounting base 135.

[0103] It is possible that the first wall 110 is the top wall of the shell, and the first cylinder 120 and the second cylinder 140 are respectively located at the top and bottom of the first wall 110.

[0104] The second cylinder 140 refers to the cylindrical component located on the first wall 110 and used to install the mounting base 135.

[0105] Mounting base 135 refers to a component used to fix the end of elastic member 134 away from the first limiting member 133.

[0106] Thus, along the axial direction of the injection hole K, the elastic element 134 can be connected between the first limiting element 133 and the mounting base 135, which is beneficial for the elastic element 134 to contract or extend along the axial direction of the injection hole K, thereby enabling the sealing element 132 to move more stably along the axial direction of the fluid channel J, which is beneficial for improving the reliability of the switch structure 130.

[0107] In some embodiments, the mounting base 135 includes a second mounting member 1351, a support member 1352, and at least one reinforcing member 1353. The second mounting member 1351 is connected to the inner peripheral wall of the second cylinder 140, the support member 1352 is located inside the second mounting member 1351, the elastic member 134 is connected between the support member 1352 and the first limiting member 133, and at least one reinforcing member 1353 is connected between the support member 1352 and the second mounting member 1351.

[0108] The second mounting component 1351 refers to the component on the mounting base 135 used for mounting on the inner peripheral wall of the second cylinder 140. The second mounting component 1351 can be a ring-shaped component, that is, the second mounting component 1351 is a second mounting ring.

[0109] The second mounting component 1351 can be snapped onto the inner peripheral wall of the second cylinder 140, or it can be threaded onto the inner peripheral wall of the second cylinder 140; no specific limitation is made here.

[0110] Support member 1352 refers to the component on mounting base 135 used to support elastic member 134.

[0111] The reinforcement component 1353 refers to the component on the mounting base 135 used to connect the second mounting component 1351 and the support component 1352.

[0112] The reinforcement component 1353 can be set one or more. Multiple reinforcement components 1353 can be arranged at intervals around the support component 1352, and each reinforcement component 1353 is connected between the support component 1352 and the second mounting component 1351.

[0113] In this way, the elastic element 134 can be connected between the support element 1352 and the first limiting element 133, which facilitates the contraction or extension of the elastic element 134 along the axial direction of the injection hole K, thereby allowing the sealing element 132 to move more stably along the axial direction of the fluid channel J, which helps to improve the reliability of the switch structure 130. In addition, at least one reinforcing member 1353 is connected between the support element 1352 and the second mounting member 1351, which can improve the strength and reliability of the mounting base 135.

[0114] In some embodiments, the switch structure 130 further includes a blocking sleeve 136, which is connected to the side of the first limiting member 133 near the injection hole K, and together with the first limiting member 133, forms a receiving groove C for at least partially accommodating the elastic member 134. The end of the elastic member 134 away from the first limiting member 133 passes through the opening of the injection hole K and the receiving groove C, and is connected to the mounting base 135.

[0115] The blocking sleeve 136 is a component used to enclose the receiving groove C with the first limiting member 133, and the blocking sleeve 136 can protect the elastic member 134.

[0116] The receiving groove C refers to the groove defined by the blocking sleeve 136 and the first limiting member 133 and used to at least partially accommodate the elastic member 134.

[0117] At least a portion of the elastic element 134 can be housed in the receiving groove C. In this way, the elastic element 134 can be protected by the blocking sleeve 136, reducing the possibility of the injected electrolyte coming into contact with the elastic element 134, thereby improving the service life and reliability of the elastic element 134.

[0118] In some embodiments, when the switch structure 130 is in the open state, the blocking sleeve 136 abuts against the mounting base 135, and the mounting base 135 seals the opening of the receiving groove C (which can be combined with...). Figure 4 and Figure 5(To understand).

[0119] Thus, when the switch structure 130 is in the open state, the injection hole K can be connected to the external environment through the open switch structure 130, and electrolyte can be injected into the battery cell 100. During the electrolyte injection process, since the mounting base 135 is sealed at the opening of the receiving tank C, the elastic element 134 can be sealed in the receiving tank C, thereby better blocking the elastic element 134 from the injected electrolyte, and thus better improving the service life and reliability of the elastic element 134.

[0120] In some embodiments, the central axis of the second cylinder 140 coincides with the central axis of the injection hole K.

[0121] The central axis of the mounting base 135, which is installed in the second cylinder 140, coincides with the central axis of the injection hole K, thereby enabling the central axis of the elastic element 134 to coincide with the central axis of the injection hole K. This allows the external force applied to the seal 132 to be evenly distributed, which is beneficial for the seal 132 to move stably along the axial direction of the fluid channel J and improves the reliability of the switch structure 130.

[0122] In some embodiments, the first wall 110 and the second cylinder 140 are integrally formed.

[0123] The first wall 110 and the second cylinder 140 are integrally formed, which can improve the strength of the shell and reduce the number of accessories required for shell assembly, thereby improving the production efficiency of the battery cell 100.

[0124] In some embodiments, along the axial direction of the first cylinder 120, the side of the first cylinder 120 that is away from the injection hole K is positioned further away from the injection hole K than the side of the seal 132 that is away from the injection hole K.

[0125] Taking the first wall 110 as the top wall of the shell as an example, it can be understood that the height of the side of the first cylinder 120 away from the injection hole K is higher than the height of the side of the seal 132 away from the injection hole K.

[0126] Since the side of the first cylinder 120 furthest from the injection hole K is located further away from the injection hole K than the side of the seal 132 furthest from the injection hole K, the seal 132 is completely located within the mounting cavity Q. This reduces the possibility of the seal 132 being squeezed by contact with external objects, thereby reducing the possibility of the switch structure 130 being accidentally opened and improving the reliability of the switch structure 130.

[0127] In some embodiments, the first cylinder 120 is provided with an overflow channel Y communicating with the mounting cavity Q, and the seal 132 is provided with a guide groove H communicating with the overflow channel Y.

[0128] Overflow channel Y refers to the channel located on the first cylinder 120 and connected to the mounting cavity Q.

[0129] The guide groove H refers to the groove provided on the seal 132 and connected to the overflow channel Y.

[0130] Fluid (such as water) remaining inside the first cylinder 120 can flow to the overflow channel Y through the guide channel H, and then be discharged outside the switch structure 130 through the overflow channel Y, reducing the accumulation of water inside the first cylinder 120, thereby reducing the probability of the battery cell 100 catching fire due to water ingress, which is beneficial to improving the safety of the battery cell 100, and thus improving the safety of the battery device 10 and electrical equipment including the battery cell 100.

[0131] In some embodiments, the guide groove H extends along the radial direction of the first cylinder 120.

[0132] The water can be guided by the guide channel H to flow roughly in the radial direction of the first cylinder 120 to the overflow channel Y, so as to facilitate the discharge of water.

[0133] In some embodiments, the side of the seal 132 away from the injection hole K is provided with a plurality of guide grooves H spaced apart around the central axis of the first cylinder 120.

[0134] This allows for the faster drainage of fluids (such as water) remaining inside the first cylinder 120 using multiple guide channels H.

[0135] In some embodiments, such as Figure 6 As shown, the seal 132 includes a main body 1321 and an edge portion 1322 disposed around the main body 1321. A guide groove H is formed in the main body 1321, and the edge portion 1322 is used to guide the fluid in the guide groove H to the overflow channel Y.

[0136] Alternatively, along the radial direction of the first cylinder 120, the edge portion 1322 has a third inner side and a third outer side that are disposed opposite to each other. Along the axial direction of the first cylinder 120, the third outer side of the edge portion 1322 is disposed closer to the injection hole K than the third inner side of the edge portion 1322.

[0137] Thus, as the fluid (such as water) remaining inside the first cylinder 120 flows through the guide groove H to the overflow channel Y, the downwardly inclined edge portion 1322 can quickly guide the fluid in the guide groove H to the overflow channel Y, thereby reducing the accumulation of water inside the first cylinder 120, which in turn reduces the probability of the battery cell 100 catching fire due to water ingress, thus improving the safety of the battery cell 100 and consequently improving the safety of the battery device 10 and electrical equipment including the battery cell 100.

[0138] In some embodiments, when the switch structure 130 is in the closed state, along the axial direction of the first cylinder 120, the edge portion 1322 of the seal 132 is further away from the injection hole K than the side of the first mounting member 131 that is away from the injection hole K.

[0139] Taking the first wall 110 as the top wall of the shell as an example, it can be understood that the height of the edge portion 1322 of the seal 132 is higher than the height of the first mounting member 131, which is beneficial to improve the sealing between the seal 132 and the inner wall of the fluid channel J, thereby reducing the probability of the battery cell 100 catching fire due to water ingress, and improving the safety of the battery cell 100.

[0140] In some embodiments, along the axial direction of the first cylinder 120, the outer edge of the first mounting member 131 is positioned further away from the injection hole K than the side of the overflow channel Y closer to the injection hole K.

[0141] This allows water on the first mounting component 131 to flow out through the lower overflow channel Y, reducing the accumulation of water inside the first cylinder 120 and thus improving the safety of the battery cell 100.

[0142] In some embodiments, the first cylinder 120 is provided with an overflow channel Y communicating with the mounting cavity Q.

[0143] In this way, the fluid (such as water) remaining inside the first cylinder 120 is discharged through the overflow channel Y, which can reduce the probability of the battery cell 100 catching fire due to water ingress, which is beneficial to improving the safety of the battery cell 100, and thus can improve the safety of the battery device 10 and electrical equipment including the battery cell 100.

[0144] In some embodiments, the first cylinder 120 includes a first portion 121 and a second portion 122 spaced apart along the axial direction of the first cylinder 120, and a plurality of connecting portions 123 connecting the first portion 121 and the second portion 122. The plurality of connecting portions 123 are spaced apart around the central axis of the first cylinder 120, and an overflow channel Y is defined between two adjacent connecting portions 123.

[0145] The connecting part 123 can be in the form of a columnar structure.

[0146] The fluid (such as water) remaining inside the first cylinder 120 can be discharged through multiple overflow channels Y, which can better reduce the probability of the battery cell 100 catching fire due to water ingress, which is beneficial to improving the safety of the battery cell 100, and thus can improve the safety of the battery device 10 and electrical equipment including the battery cell 100.

[0147] In some embodiments, such as Figure 7 As shown, a drainage surface 111 is provided on the first wall 110, which surrounds the injection hole K and is located between the injection hole K and the first cylinder 120. Along the radial direction of the injection hole K, the drainage surface 111 has a second inner side and a second outer side disposed opposite to each other. Along the axial direction of the injection hole K, the second outer side of the drainage surface 111 is disposed further away from the injection hole K than the second inner side.

[0148] The first wall 110 is the top wall of the shell, and the drainage surface 111 is located on the top of the first wall 110.

[0149] The drainage surface 111 refers to the surface provided on the first wall 110 and used to guide the electrolyte into the injection hole K.

[0150] Thus, the drainage surface 111 is inclined and is used to guide the electrolyte into the injection hole K, reducing the possibility of electrolyte residue at the drainage surface 111.

[0151] In some embodiments, the central axis of the first cylinder 120 coincides with the central axis of the injection hole K.

[0152] In this way, the central axis of the first mounting member 131 installed in the first cylinder 120 and the sealing member 132 provided in the first mounting member 131 can be made to coincide with the central axis of the injection hole K, which facilitates the uniform application of external force to the switch structure 130, thereby improving the stability of the movement of the sealing member 132 along the axial direction of the injection hole K, and thus improving the reliability of the switch structure 130.

[0153] In some embodiments, the first wall 110 and the first cylinder 120 are integrally formed.

[0154] The first wall 110 and the first cylinder 120 are integrally formed, which can improve the strength of the shell and reduce the number of accessories required for shell assembly, thereby improving the production efficiency of the battery cell 100.

[0155] In some embodiments, the battery cell 100 further includes an explosion-proof valve 150 disposed on the first wall 110, the explosion-proof valve 150 being used to release emissions generated when the battery cell 100 experiences thermal runaway to the outside of the battery cell 100.

[0156] In some embodiments, the battery cell 100 further includes a fastening plate 160 disposed on the first wall 110. The housing includes a top cover 110a and a bottom cover. The first wall 110 is disposed on the top cover 110a. The fastening plate 160 is disposed on the inner side of the first wall 110. The fastening plate 160 has two locking members 161 extending into the bottom cover. The two locking members 161 are respectively located on opposite sides of the electrode assembly of the battery cell 100 along the longitudinal direction of the first wall 110.

[0157] In this embodiment, the fastening plate 160 also includes a plate body portion 162 stacked with the first wall 110. Two locking members 161 are provided on opposite sides of the plate body portion 162 along the longitudinal direction of the first wall 110. An injection hole K is also provided through the plate body portion 162. The first cylinder 120 is located at the top of the top cover 110a, and the second cylinder 140 is located at the bottom of the plate body portion 162.

[0158] In some embodiments, the first wall 110 is the top wall of the housing.

[0159] Thus, when electrolyte needs to be injected into the battery cell 100, the switch structure 130 can be pressed downwards to open it, allowing the injection hole K to connect with the external fluid via the open switch structure 130, enabling the electrolyte from the external environment to be injected into the battery cell 100. After the electrolyte injection is completed, the switch structure 130 will automatically switch from the open to the closed state under the elastic restoring force of the elastic element 134 of the switch structure 130. This allows the switch structure 130 to close the mounting cavity Q, and since the mounting cavity Q is located upstream of the injection hole K, the switch structure 130 can also close the injection hole K, which helps to prevent external water from entering the battery cell 100, reducing the probability of the battery cell 100 catching fire due to water ingress, improving the safety of the battery cell 100, and consequently improving the safety of the battery device 10 and electrical equipment including the battery cell 100.

[0160] One embodiment of this application provides a battery device 10, including a battery cell 100 from any of the above embodiments.

[0161] An embodiment of this application also provides an electrical device, including the battery device 10 described above.

[0162] An embodiment of this application also provides a liquid injection device, which is applied to the battery cell 100 of any of the above embodiments. The liquid injection device includes a liquid injection nozzle 200, which has a liquid injection channel Z. The liquid injection nozzle 200 is used to drive the switch structure 130 to switch from a closed state to an open state, so that the liquid injection channel Z can communicate with the liquid injection hole K.

[0163] Injection nozzle 200 refers to the nozzle on the injection device used to inject electrolyte.

[0164] Injection channel Z refers to the channel located at injection nozzle 200 through which electrolyte passes.

[0165] The switch structure 130 can be switched from the closed state to the open state by the injection nozzle 200, so that the injection channel Z can be connected to the injection hole K, and then the injection device can be used to inject liquid into the battery cell 100.

[0166] In some embodiments, along the axial direction of the injection channel Z, the injection nozzle 200 is provided with one end of the injection channel Z being recessed inward.

[0167] Because the outlet end of the injection nozzle 200 with the injection channel Z is recessed inward, the outlet end of the injection nozzle 200 with the injection channel Z can form an outlet groove R that is connected to the injection channel Z and the injection hole K respectively. This facilitates the discharge of electrolyte in the injection nozzle 200 through the outlet groove R, reduces the possibility of the injection nozzle 200 being blocked when squeezed downward, and further reduces the possibility of electrolyte being blocked. This makes it easier for the electrolyte in the injection nozzle 200 to be injected into the battery cell 100 through the injection hole K.

[0168] In some embodiments, the injection nozzle 200 has a plurality of outlet grooves R arranged around the outlet of the injection channel Z at one end.

[0169] The injection nozzle 200 has a wavy structure at one end of the outlet of the injection channel Z.

[0170] In this way, the electrolyte in the injection nozzle 200 can flow into the injection hole K through multiple outlet channels R, which facilitates the injection of the electrolyte in the injection nozzle 200 into the battery cell 100 through the injection hole K.

[0171] Of course, this application is not limited to this. After the battery cell 100 has been filled with liquid and charged and discharged, the vacuum nozzle of the vacuum device can be used to drive the switch structure 130 from the closed state to the open state, so that the liquid filling channel Z can be connected with the vacuum nozzle, and the gas generated in the battery cell 100 can be discharged from the battery cell 100 through the vacuum nozzle.

[0172] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0173] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell (100) characterized by, The application relates to a switch structure (130) of a battery cell, which comprises the following parts: a shell, which comprises a first wall (110) provided with a liquid injection hole (K); a first cylinder (120) arranged on the first wall (110) and surrounding the liquid injection hole (K), wherein the first cylinder (120) and the first wall (110) surround a mounting cavity (Q), and the mounting cavity (Q) is communicated with the liquid injection hole (K) along the axial direction of the liquid injection hole (K); and the switch structure (130) arranged in the mounting cavity (Q). The switch structure (130) is configured to be switched between a closed state and an open state, wherein the switch structure (130) seals the mounting cavity (Q) when the switch structure (130) is in the closed state; and the switch structure (130) opens the mounting cavity (Q) to make the liquid injection hole (K) communicated with the external environment when the switch structure (130) is in the open state. The switch structure (130) comprises:

2. The battery cell (100) according to claim 1, characterized in that a first mounting part (131) arranged in the mounting cavity (Q), wherein the first mounting part (131) comprises a fluid channel (J) communicated with the mounting cavity (Q); and a sealing part (132) movably connected to the inner side wall of the fluid channel (J) to switch the switch structure (130) from the closed state to the open state. When the switch structure (130) is in the closed state, the sealing part (132) is sealingly connected to the side wall of the fluid channel (J); and when the switch structure (130) is in the open state, at least part of the sealing part (132) is separated from the side wall of the fluid channel (J), and the liquid injection hole (K) is communicated with the external environment through the fluid channel (J). The sealing part (132) can move relative to the inner side wall of the fluid channel (J) along the axial direction of the fluid channel (J) to switch the switch structure (130) from the closed state to the open state. Along the axial direction of the liquid injection hole (K), the side, away from the liquid injection hole (K), of the first mounting part (131) is provided with a flow guide surface (1311) surrounding the fluid channel (J); 3. The battery cell (100) according to claim 2, characterized in that Along the radial direction of the fluid channel (J), the flow guide surface (1311) has oppositely arranged first inner and outer side edges; and along the axial direction of the fluid channel (J), the first outer side edge of the flow guide surface (1311) is arranged closer to the liquid injection hole (K) than the first inner side edge of the flow guide surface (1311).

4. The battery cell (100) according to claim 2, characterized in that The switch structure (130) further comprises a first limiting part (133) arranged on the side, close to the liquid injection hole (K), of the first mounting part (131) and connected with the sealing part (132). The switch structure (130) further comprises an elastic part (134) connected with the first limiting part (133) and the first wall (110) respectively.

5. The battery cell (100) of claim 2, wherein, ​ 6. The battery cell (100) according to claim 5, characterized in that ​ 7. The battery cell (100) according to claim 6, characterized in that The battery cell (100) further comprises a second cylinder (140), the first cylinder (120) and the second cylinder (140) are respectively arranged on opposite sides of the first wall (110) along the axial direction of the liquid injection hole (K); The switch structure (130) further comprises a mounting seat (135), the mounting seat (135) is arranged in the second cylinder (140); Wherein, one end of the elastic member (134) away from the first limiting member (133) passes through the liquid injection hole (K) and is connected to the mounting seat (135).

8. The battery cell (100) according to claim 7, characterized in that The mounting seat (135) comprises: A second mounting member (1351) connected to the inner circumferential wall of the second cylinder (140); A support member (1352) located on the inner side of the second mounting member (1351), the elastic member (134) is connected between the support member (1352) and the first limiting member (133); and At least one reinforcing member (1353) connected between the support member (1352) and the second mounting member (1351).

9. The battery cell (100) according to claim 7, characterized in that The switch structure (130) further comprises a blocking sleeve (136), the blocking sleeve (136) is connected to the side of the first limiting member (133) close to the liquid injection hole (K), and the first limiting member (133) and the blocking sleeve (136) surround a receiving groove (C) for at least partially accommodating the elastic member (134); One end of the elastic member (134) away from the first limiting member (133) passes through the slot of the liquid injection hole (K) and the receiving groove (C), and is connected to the mounting seat (135).

10. The battery cell (100) according to claim 9, characterized in that In the case that the switch structure (130) is in the open state, the blocking sleeve (136) abuts against the mounting seat (135), and the mounting seat (135) blocks the slot of the receiving groove (C).

11. The battery cell (100) of claim 7, wherein, The central axis of the second cylinder (140) and the central axis of the liquid injection hole (K) coincide with each other.

12. The battery cell (100) of claim 7, wherein, The first wall (110) and the second cylinder (140) are an integral structure.

13. The battery cell (100) of claim 2, wherein, Compared with the side of the sealing member (132) away from the liquid injection hole (K), the side of the first cylinder (120) away from the liquid injection hole (K) is farther away from the liquid injection hole (K) along the axial direction of the first cylinder (120).

14. The battery cell (100) of claim 2, wherein, The first cylinder (120) is provided with an overflow channel (Y) communicating with the mounting cavity (Q); The sealing member (132) is provided with a flow guide groove (H) communicating with the overflow channel (Y).

15. The battery cell (100) according to claim 14, characterized in that The flow guide groove (H) is arranged extending along the radial direction of the first cylinder (120).

16. The battery cell (100) of claim 14, wherein, The side of the sealing member (132) away from the liquid injection hole (K) is provided with a plurality of flow guide grooves (H) spaced around the central axis of the first cylinder (120).

17. The battery cell (100) of claim 14, wherein, The sealing member (132) comprises a main body portion (1321) and an edge portion (1322) arranged around the main body portion (1321); The flow guide groove (H) is formed in the main body portion (1321); The edge portion (1322) is used for guiding the fluid in the flow guide groove (H) to flow to the overflow channel (Y).

18. The battery cell (100) according to claim 17, characterized in that In the case that the switch structure (130) is in the closed state, along the axial direction of the first cylinder (120), compared to the side of the first mounting member (131) away from the liquid injection hole (K), the edge portion (1322) of the sealing member (132) away from the liquid injection hole (K) is arranged further away from the liquid injection hole (K).

19. The battery cell (100) of claim 14, wherein, Along the axial direction of the first cylinder (120), compared to the side of the overflow channel (Y) close to the liquid injection hole (K), the outer edge of the first mounting member (131) is arranged further away from the liquid injection hole (K).

20. The battery cell (100) according to any one of claims 1-19, characterized in that, The first cylinder (120) is provided with an overflow channel (Y) in communication with the mounting cavity (Q).

21. The battery cell (100) according to claim 20, characterized in that The first cylinder (120) comprises a first portion (121) and a second portion (122) arranged in the axial direction of the first cylinder (120) and a plurality of connecting portions (123) connected between the first portion (121) and the second portion (122). The plurality of connecting portions (123) are arranged around the central axis of the first cylinder (120), and the adjacent two connecting portions (123) define the overflow channel (Y).

22. The battery cell (100) according to any one of claims 1 to 19, characterized in that The first wall (110) is provided with a flow guide surface (111) arranged around the liquid injection hole (K) and between the liquid injection hole (K) and the first cylinder (120). Along the radial direction of the liquid injection hole (K), the flow guide surface (111) has a second inner side and a second outer side arranged oppositely. Along the axial direction of the liquid injection hole (K), compared to the second inner side of the flow guide surface (111), the second outer side of the flow guide surface (111) is arranged further away from the liquid injection hole (K).

23. The battery cell (100) according to any one of claims 1-19, characterized in that The central axis of the first cylinder (120) coincides with the central axis of the liquid injection hole (K).

24. The battery cell (100) according to any one of claims 1 to 19, characterized in that The first wall (110) and the first cylinder (120) are an integral structure.

25. A battery device, characterized by The battery device comprises the battery cell (100) as claimed in any one of claims 1-24.

26. An electrical device, comprising: The battery device comprises the battery cell (100) as claimed in claim 25.

27. A liquid injection device, characterized by The liquid injection device is applied to the battery cell (100) as claimed in any one of claims 1-24, and the liquid injection device comprises a liquid injection nozzle (200) having a liquid injection channel (Z), and the liquid injection nozzle (200) is used to drive the switch structure (130) to switch from the closed state to the open state, so that the liquid injection channel (Z) can be in communication with the liquid injection hole (K).

28. The liquid injection device of claim 27, wherein, Along the axial direction of the liquid injection channel (Z), the end of the liquid injection nozzle (200) arranged at the outlet of the liquid injection channel (Z) is arranged inwardly recessed.

Images