Battery cell, battery device, and electric device

Abstract

The application relates to a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell and an insulation piece. The shell comprises a first wall provided with a liquid injection hole, and the insulation piece is arranged on the inner side of the first wall along the thickness direction of the first wall. The insulation piece comprises a one-way sealing structure provided with a liquid injection channel. When the insulation piece is in a sealing state, the one-way sealing structure abuts against one end of the side wall of the liquid injection hole close to the insulation piece along the axis direction of the liquid injection hole at a preset pressure to seal the one end of the liquid injection hole close to the insulation piece. When the insulation piece is in a non-sealing state, at least part of the one-way sealing structure is separated from the side wall of the liquid injection hole, and the liquid injection hole is communicated with the liquid injection channel. The insulation piece can be switched from the sealing state to the non-sealing state in response to the pressure of the fluid flowing into the liquid injection hole. The safety of the battery monomer can be improved while meeting the liquid injection requirement of the battery monomer.

Description

Technical Field

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

[0002] In related technologies, a battery cell includes an end cap, which has an injection hole through which electrolyte is typically injected into the battery cell.

[0003] With the widespread application of battery cells, improving their safety has become an urgent issue. Summary of the Invention

[0004] Therefore, it is necessary to provide a battery cell, battery device, and electrical equipment that can reduce the risk of foreign objects falling into the battery cell and the risk of electrolyte leakage, thereby improving the safety of the battery cell.

[0005] According to a first aspect of this application, a battery cell is provided, including a casing and an insulating member. The casing includes a first wall having a liquid injection hole, and the insulating member is disposed on the inner side of the first wall along its thickness direction. The insulating member includes a one-way sealing structure with a liquid injection channel. The one-way sealing structure includes a sealing portion and a surrounding portion surrounding the sealing portion, and the liquid injection channel is formed on the surrounding portion. The sealing portion is sealingly connected to the sidewall of the liquid injection hole near the end of the insulating member. The insulating member is an integrally formed structure.

[0006] In the technical solution of this application, since the sealing part is sealed and connected to the side wall of the injection hole near the end of the insulating member, the insulating member can be used to block the internal space of the battery cell from the external environment, thereby reducing the risk of foreign objects falling into the battery cell and the risk of electrolyte leakage, thus improving the safety of the battery cell. In addition, the insulating member is an integrally formed structure, which facilitates the assembly between the insulating member and the first wall, thereby improving the assembly efficiency of the battery cell, and also facilitates the one-way sealing structure to abut against the side wall of the injection hole near the end of the insulating member with a preset pressure along the axial direction of the injection hole.

[0007] In some embodiments, the insulating member has a sealed state and a non-sealed state. When the insulating member is in the sealed state, a one-way sealing structure abuts against the sidewall of the injection hole near the insulating member at a preset pressure along the axial direction of the injection hole, so that the sealing part is sealed to the sidewall of the injection hole near the insulating member. When the insulating member is in the non-sealed state, at least a portion of the sealing part is separated from the sidewall of the injection hole, and the injection hole is connected to the injection channel; the insulating member can switch from the sealed state to the non-sealed state in response to the pressure of the fluid flowing into the injection hole.

[0008] With the insulating component in a sealed state, the one-way sealing structure abuts against the side wall of the injection hole near the insulating component at a preset pressure along the axial direction of the injection hole, sealing that end of the injection hole near the insulating component. This ensures the one-way sealing structure is tightly abutted against the side wall of the injection hole near the insulating component, and the insulating component effectively blocks the internal space of the battery cell from the external environment, reducing the risk of foreign objects falling into the battery cell and the risk of electrolyte leakage. Furthermore, the insulating component can switch from a sealed state to a non-sealed state in response to the pressure of the fluid flowing into the injection hole. That is, during the injection process, the insulating component can switch to a non-sealed state under the pressure of the fluid flowing into the injection hole, connecting the injection hole and the injection channel. This allows the electrolyte to be injected into the internal space of the battery cell through the injection hole and the injection channel, thus improving the safety of the battery cell while meeting its injection requirements.

[0009] In one embodiment, the first wall includes a first connector, and the insulating member further includes a second connector located radially outward of the one-way sealing structure along the injection hole. Along the thickness direction of the first wall, the insulating member is connected to the inner side of the first wall by means of the second connector and the first connector, such that the one-way sealing structure abuts against the sidewall of the injection hole near the insulating member at a predetermined pressure along the axial direction of the injection hole.

[0010] In this way, the first wall and the insulating component are connected by the first connector and the second connector, so that the one-way sealing structure abuts against the side wall of the injection hole near the insulating component with a preset pressure along the axial direction of the injection hole, thereby allowing the insulating component to be in a sealed state under normal conditions, which can improve the safety and reliability of the battery cell.

[0011] In one embodiment, the insulating member further includes a main body structure surrounding the one-way sealing structure, and a second connector is disposed on the main body structure. Multiple fluid channels are provided through the main body structure along the axial direction of the injection hole, and the injection hole is connected to these multiple fluid channels even when the insulating member is in a non-sealed state.

[0012] When the insulating parts are not sealed, the electrolyte flowing into the injection hole can flow into the interior of the battery cell through the injection channel and fluid channel, which can effectively disperse the electrolyte and reduce the impact force formed by the electrolyte, thereby improving the safety and reliability of the battery cell.

[0013] In one embodiment, when the insulating element is in a sealed state, the one-way sealing structure is recessed towards the side closer to the injection hole along the axial direction of the injection hole.

[0014] Under normal conditions, the one-way sealing structure is positioned to abut against the side wall of the injection hole near the end of the insulating component, thereby sealing the end of the injection hole near the insulating component.

[0015] In one embodiment, at least the one-way sealing structure of the insulating element is resilient.

[0016] Thus, during the process of injecting electrolyte into the battery cell, the electrolyte flows into the injection hole at a certain pressure, which causes at least one-way sealing structure in the insulating component to deform under the pressure. This causes at least a portion of the one-way sealing structure to separate from the sidewall of the injection hole, thereby effectively driving the insulating component to switch from a sealed state to a non-sealed state.

[0017] In one embodiment, the orthographic projection of the injection channel on the target plane does not overlap with the orthographic projection of the injection hole on the target plane, and in a direction parallel to the target plane, the orthographic projection of the injection channel on the target plane is located outside the orthographic projection of the injection hole on the target plane, and the target plane is perpendicular to the thickness direction of the first wall.

[0018] Thus, during the electrolyte injection process of the battery cell, the insulating component can switch from a sealed state to an unsealed state in response to the pressure of the fluid flowing into the injection hole. This allows the electrolyte flowing into the injection hole to flow into the interior of the battery cell through the injection channel. Since the injection channel is located outside the injection hole in a direction parallel to the target plane, the electrolyte flowing into the injection hole can flow into the interior of the battery cell through the injection channel, which is further outward along the radial direction of the injection hole. This reduces the impact of this electrolyte on the electrodes and other components inside the battery cell, and also reduces the risk of electrolyte directly hitting the inner surface of the electrode assembly, thereby improving the reliability of the battery cell.

[0019] In one embodiment, the surrounding part is provided with multiple injection channels, which are arranged at intervals around the central axis of the injection hole.

[0020] During the process of injecting electrolyte into a battery cell, multiple injection channels can be used to better disperse the electrolyte flowing into the injection hole, thereby reducing the impact of this electrolyte on the electrode sheets inside the battery cell and reducing the risk of electrolyte directly hitting the inner side of the electrode assembly, thus improving the reliability of the battery cell.

[0021] In one embodiment, each injection channel has a first end and a second end disposed opposite each other along the radial direction of the injection hole, and the first end to the second end of each injection channel extends in a curved manner. Along the circumferential direction of the plurality of injection channels, a subsequent injection channel rotates relative to the preceding injection channel by a predetermined angle according to a predetermined rotation direction.

[0022] The subsequent injection channel rotates at a preset angle relative to the previous injection channel in a preset rotation direction, so that the one-way sealing structure acts like a spiral spring. This allows the one-way sealing structure to respond more quickly to the pressure of the fluid flowing into the injection hole and switch from a sealed state to a non-sealed state, thereby improving the safety, injection efficiency, and injection convenience of the battery cell.

[0023] In one embodiment, all injection channels are arranged to form multiple groups of injection channels arranged from the inside out around the central axis of the injection hole, and each injection channel group includes multiple injection channels spaced apart around the central axis of the injection hole.

[0024] Multiple injection channel groups are arranged from the inside out. The multiple injection channels in each injection channel group are evenly distributed around the injection hole, which can make the electrolyte flowing into the injection hole flow into the internal space of the battery cell more evenly. In addition, the multiple injection channels can dissipate the impact force of the electrolyte and better reduce the risk of electrolyte directly hitting the inner side of the electrode assembly, thereby improving the reliability of the battery cell.

[0025] In one embodiment, the sealing part has a sealing surface perpendicular to the axial direction of the injection hole, and the sealing surface is sealed to the side wall of the injection hole near the end of the insulating member.

[0026] This allows the one-way sealing structure to better contact the side wall of the injection hole with the end near the insulating component at a preset pressure along the axial direction of the injection hole. This improves the sealing reliability of the insulating component connected to the side wall of the injection hole in a sealed state, thereby reducing the risk of foreign objects falling into the battery cell and reducing the risk of electrolyte leakage, thus improving the safety of the battery cell.

[0027] In one embodiment, the surrounding portion is provided with a plurality of injection channels, all of which are spaced apart around the central axis of the injection hole, and each injection channel extends curvedly from one end near the sealing portion to the other end. Along the circumferential direction of the plurality of injection channels, each subsequent injection channel is rotated by a predetermined angle relative to the preceding injection channel in a predetermined rotation direction.

[0028] This allows the one-way sealing structure to respond more quickly to the pressure of the fluid flowing into the injection hole, switching from a sealed state to a non-sealed state, thereby improving the safety, injection efficiency, and injection convenience of the battery cell.

[0029] In one embodiment, the surrounding portion includes a plurality of sub-surrounding portions, which are disposed around the sealing portion from the inside out. The sub-surrounding portions farther away from the sealing portion are further away from the injection hole along the axial direction of the injection hole.

[0030] This design allows the one-way sealing structure to better contact the sidewall of the injection hole with the end near the insulating component at a preset pressure along the axial direction of the injection hole. It also allows the one-way sealing structure to respond more quickly to the pressure of the fluid flowing into the injection hole and switch from a sealed state to a non-sealed state. Furthermore, the one-way sealing structure can be compressed into a plane in response to the pressure of the fluid flowing into the injection hole, resulting in a relatively low height dimension occupied by the compressed one-way sealing structure. This facilitates the flow of electrolyte into the battery cell through the space between the one-way sealing structure and the sidewall of the injection hole and the injection channel, thereby improving the safety, injection efficiency, and injection convenience of the battery cell.

[0031] In one embodiment, each sub-surrounding part is provided with a plurality of liquid injection channels spaced apart around the sealing part.

[0032] The electrolyte can be evenly dispersed through multiple injection channels on each sub-encircling part. These multiple injection channels can dissipate the impact force of the electrolyte and reduce the risk of the electrolyte directly hitting the inner side of the electrode assembly, thereby improving the reliability of the battery cell.

[0033] In one embodiment, a plurality of injection channels are provided through the surrounding portion along the axial direction of the injection hole. All injection channels are spaced apart around the central axis of the injection hole, and each injection channel extends in a curved manner from one end near the sealing portion to the other end. Along the circumferential direction of the plurality of injection channels, each subsequent injection channel is rotated by a predetermined angle relative to the preceding injection channel according to a predetermined rotation direction.

[0034] The electrolyte flowing into the injection hole can be dispersed in a spiral shape in the surrounding area below the injection hole through the injection channel, and also dispersed in a spiral shape inside the battery cell. This can effectively dissipate the impact force of the electrolyte and reduce the risk of the electrolyte directly hitting the inner side of the electrode assembly, thereby improving the reliability of the battery cell.

[0035] In one embodiment, the sub-surrounding portion closest to the sealing portion is flush with the side surface of the sealing portion near the first wall.

[0036] The electrolyte flowing into the injection hole can flow into the injection channel relatively quickly and disperse outward in a spiral shape from the end of the injection channel near the sealing part. This can effectively dissipate the impact force of the electrolyte, reduce the risk of electrode assembly being washed away and separator wrinkling, improve the wetting effect of the electrolyte, reduce the risk of black spots and short circuits on the electrode surface, and thus improve the reliability of the battery cell.

[0037] In one embodiment, the insulating element further includes a main structure surrounding the one-way sealing structure, with the end of the injection channel away from the sealing portion extending onto the main structure and penetrating the main structure along the axial direction of the injection hole.

[0038] The end of the electrolyte injection channel furthest from the seal is further from the center of the injection hole, which is more conducive to the electrolyte flowing into the injection hole being dispersed in a spiral shape in the surrounding area below the injection hole. This can effectively dissipate the impact force of the electrolyte, reduce the risk of electrode components being washed away and separator wrinkling, improve the electrolyte wetting effect, reduce the risk of black spots and short circuits on the electrode surface, and thus improve the reliability of the battery cell.

[0039] In one embodiment, the battery cell further includes a sealant disposed between the sealing portion and the sidewall of the injection hole near the end of the insulating member.

[0040] The relatively flat sealant can make more contact with the sidewall of the injection hole, thereby improving the sealing reliability between the one-way sealing structure and the sidewall of the injection hole.

[0041] In one embodiment, the insulating element is a 3D-printed, one-piece structure.

[0042] By using 3D printing to form insulating components, the structure of the insulating components and unidirectional sealing structure is no longer limited by the manufacturing cost and difficulty of the mold. The required unidirectional sealing structure and insulating components can be designed according to the design requirements, which to a certain extent helps to improve the safety and reliability of the battery cell.

[0043] According to a second aspect of this application, a battery device is provided, comprising a battery cell of any of the above embodiments.

[0044] According to a third aspect of this application, an electrical device is provided, including the battery device described above.

[0045] 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, the following are specific embodiments of this application. Attached Figure Description

[0046] 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:

[0047] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of this application is shown.

[0048] Figure 2 An exploded schematic diagram of a battery device according to an embodiment of this application is shown.

[0049] Figure 3 An exploded schematic diagram of a battery cell according to an embodiment of this application is shown.

[0050] Figure 4 A schematic diagram of the structure of an end cap and an insulating component according to an embodiment of this application is shown.

[0051] Figure 5 It shows Figure 4 An enlarged schematic diagram of point A.

[0052] Figure 6 A side view of an insulating member according to an embodiment of this application is shown.

[0053] Figure 7 A top view of an insulating member according to an embodiment of this application is shown.

[0054] Figure 8 A schematic diagram of the structure of an insulating member according to another embodiment of this application is shown.

[0055] Figure 9 It shows Figure 8 An enlarged schematic diagram of point B.

[0056] Figure 10 A side view of an insulating member according to another embodiment of this application is shown.

[0057] Figure 11 A top view of an insulating member according to another embodiment of this application is shown.

[0058] Figure 12 A schematic diagram of the structure of an insulating component according to another embodiment of this application is shown.

[0059] Figure 13 It shows Figure 12 An enlarged schematic diagram of point C.

[0060] Figure 14 A side view of an insulating member according to yet another embodiment of this application is shown.

[0061] Figure 15 A top view of an insulating member according to yet another embodiment of this application is shown.

[0062] Reference numerals: 1. Vehicle; 10. Battery assembly; 100. Battery cell; 110. Outer casing; 111. First wall; K. Injection hole; 1111. First connector; 112. End cap; 113. Housing; 120. Insulating component; 121. One-way sealing structure; Z. Injection channel; 1211. Sealing part; 12111. Sealing surface; 1212. Surrounding part; 12121. Sub-surrounding part; 122. Second connector; 123. Main structure; T. Fluid channel; 130. Electrode assembly; 140. Explosion-proof valve; 200. Housing; 210. Housing cover; 220. Housing body; 20. Motor; 30. Controller. Detailed Implementation

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] In related technologies, the liquid injection hole of the end cap is in an open state before liquid injection, which poses a risk that foreign objects may fall into the battery cell through the liquid injection hole. Furthermore, there is a risk of electrolyte leakage after liquid injection and before sealing the liquid injection hole, thereby affecting the safety performance of the battery.

[0070] To improve the safety of battery cells, this application designs a battery cell that can reduce the risk of foreign objects falling into the battery cell and also reduce the risk of electrolyte leakage, thereby improving the safety of the battery cell.

[0071] The battery cells and / or battery devices disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. These electrical equipment can be, but is 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 of this electrical equipment can be constructed using the battery cells and / or battery devices disclosed in this application, which facilitates providing power to the equipment and extends its service life.

[0072] Figure 1 This 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.

[0073] 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.

[0074] The battery device 10 includes at least one battery cell 100.

[0075] 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.

[0076] like Figure 2As shown, the battery device 10 may also include a housing 200, in which all battery cells 100 are housed. Specifically, the housing 200 may include a body 220 and a cover 210, with the cover 210 detachably connected to the body 220 so that all battery cells 100 can be housed within the housing 200.

[0077] Figure 3 An exploded view of a battery cell 100 according to an embodiment of this application is shown. Figure 4 A schematic diagram of the structure of end cap 112 and insulating component 120 is shown.

[0078] Please refer to the following: Figure 3 and Figure 4 One embodiment of this application provides a battery cell 100, including a housing 110 and an insulating member 120. The housing 110 includes a first wall 111, which has a liquid injection hole K.

[0079] The casing 110 refers to the component on the battery cell 100 used to house the electrode assembly 130 and electrolyte of the battery cell 100.

[0080] The first wall 111 can be the top wall of the outer casing 110, or it can be the bottom wall of the outer casing 110; no specific limitation is made here. For example, the outer casing 110 includes an end cap 112 and a housing 113. The end cap 112 is connected to the top of the housing 113, and the first wall 111 is disposed on the end cap 112, that is, the first wall 111 is the top wall of the outer casing 110.

[0081] The electrolyte injection hole K refers to the hole that penetrates the first wall 111 and is used to inject electrolyte into the outer casing 110.

[0082] The battery cell 100 may also include an explosion-proof valve 140 disposed on the first wall 111. The explosion-proof valve 140 is used to release pressure when the gas pressure inside the housing 110 reaches a preset value, so as to improve the safety of the battery cell 100.

[0083] Along the thickness direction of the first wall 111, the insulating member 120 is disposed on the inner side of the first wall 111; and the insulating member 120 includes a one-way sealing structure 121, on which a liquid injection channel Z is provided. Figure 5 As shown, the one-way sealing structure 121 includes a sealing portion 1211 and a surrounding portion 1212 disposed around the sealing portion 1211. The liquid injection channel Z is formed on the surrounding portion 1212, and the sealing portion 1211 is sealed to the end of the sidewall of the liquid injection hole K near the insulating member 120.

[0084] The inner side of the first wall 111 refers to the side of the first wall 111 that is closer to the insulating member 120 along the thickness direction of the first wall 111.

[0085] The insulating component 120 refers to a component located on the inner side of the first wall 111 and including a one-way sealing structure 121. The insulating component 120 may be a plastic component or other component with insulating material.

[0086] The sealing part 1211 refers to the part of the one-way sealing structure 121 used to seal the side wall connected to the injection hole K.

[0087] The surrounding part 1212 refers to the part of the one-way sealing structure 121 that surrounds the sealing part 1211.

[0088] The injection channel Z refers to the channel provided on the one-way sealing structure 121. The injection channel Z is used to communicate with the injection hole K when at least a part of the sealing part 1211 is separated from the side wall of the injection hole K. In other words, the injection channel Z is used to communicate with the injection hole K when the insulating part 120 is in a non-sealed state.

[0089] Since the sealing part 1211 is sealed to the side wall of the injection hole K near the end of the insulating member 120, the insulating member 120 can be used to block the internal space of the battery cell 100 from the external environment, thereby reducing the risk of foreign objects falling into the battery cell 100 and the risk of electrolyte leakage, thus improving the safety of the battery cell 100. In addition, the insulating member 120 is an integrally formed structure, which facilitates the assembly between the insulating member 120 and the first wall 111, thereby improving the assembly efficiency of the battery cell 100, and also facilitates the one-way sealing structure 121 to abut against the side wall of the injection hole K near the end of the insulating member 120 with a preset pressure along the axial direction of the injection hole K.

[0090] In some embodiments, the insulating member 120 has a sealed state and a non-sealed state. When the insulating member 120 is in the sealed state, the one-way sealing structure 121 abuts against the sidewall of the injection hole K near the end of the insulating member 120 along the axial direction of the injection hole K with a preset pressure, so that the sealing part 1211 is sealed to the sidewall of the injection hole K near the end of the insulating member 120. When the insulating member 120 is in the non-sealed state, at least a portion of the sealing part 1211 is separated from the sidewall of the injection hole K, and the injection hole K is connected to the injection channel Z. The insulating member 120 can switch from the sealed state to the non-sealed state in response to the pressure of the fluid flowing into the injection hole K.

[0091] The sealed state refers to the state of the insulating component 120 when the liquid injection hole K is sealed near one end of the insulating component 120. At this time, the liquid injection hole K and the liquid injection channel Z are not connected to each other. Thus, by setting the insulating component 120, the internal space of the battery cell 100 can be kept separate from the external environment.

[0092] In the unsealed state, the insulating member 120 is in a state where at least a portion of the sealing part 1211 is separated from the sidewall of the injection hole K. At this time, the injection hole K is connected to the injection channel Z, and the electrolyte can flow into the internal space of the battery cell 100 through the injection hole K and the injection channel Z to perform the injection operation.

[0093] "The insulating component 120 can switch from a sealed state to a non-sealed state in response to the pressure of the fluid flowing into the injection hole K" means that the electrolyte flowing into the injection hole K at a certain pressure causes the insulating component 120 to switch from a sealed state to a non-sealed state under the pressure of this portion of electrolyte.

[0094] At least a portion of the sealing part 1211 is separated from the sidewall of the injection hole K. This could mean that a part of the sealing part 1211 is separated from the sidewall of the injection hole K, or that the sealing part 1211 is separated from the sidewall of the injection hole K.

[0095] When the insulating component 120 is in a sealed state, the one-way sealing structure 121 abuts against the end of the sidewall of the injection hole K near the insulating component 120 with a preset pressure along the axial direction of the injection hole K, thereby sealing the end of the injection hole K near the insulating component 120. In this way, the one-way sealing structure 121 can be tightly abutted against the end of the sidewall of the injection hole K near the insulating component 120, and the insulating component 120 can be used to block the internal space of the battery cell 100 from the external environment, thereby reducing the risk of foreign objects falling into the battery cell 100 and reducing the risk of electrolyte leakage. Furthermore, the insulating component 120 can switch from a sealed state to a non-sealed state in response to the pressure of the fluid flowing into the injection hole K. That is, during the process of injecting electrolyte into the battery cell 100, the insulating component 120 can switch to a non-sealed state under the pressure of the fluid flowing into the injection hole K, so that the injection hole K is connected to the injection channel Z, thereby allowing the electrolyte to be injected into the internal space of the battery cell 100 through the injection hole K and the injection channel Z. Therefore, the safety of the battery cell 100 can be improved while meeting the electrolyte injection requirements of the battery cell 100.

[0096] Under normal circumstances, the insulating component 120 is in a sealed state.

[0097] In some embodiments, the first wall 111 includes a first connector 1111, and the insulating member 120 further includes a second connector 122 located radially outside the one-way sealing structure 121 along the injection hole K.

[0098] Along the thickness direction of the first wall 111, the insulating member 120 is connected to the inner side of the first wall 111 by means of the second connector 122 and the first connector 1111, so that the one-way sealing structure 121 abuts against the side wall of the injection hole K near the end of the insulating member 120 with a preset pressure along the axial direction of the injection hole K.

[0099] It is possible that the second connector 122 is an integral structure surrounding the one-way sealing structure 121, or that there are multiple second connectors 122 arranged at intervals around the one-way sealing structure 121.

[0100] For example, the first connector 1111 is arranged around the injection hole K, and multiple second connectors 122 are provided. The multiple second connectors 122 are arranged at intervals around the one-way sealing structure 121. The first connector 1111 is provided with a connecting part (such as the groove described below) that corresponds one-to-one with the second connector 122.

[0101] Thus, the first wall 111 and the insulating member 120 are connected by the first connector 1111 and the second connector 122, so that the one-way sealing structure 121 abuts against the side wall of the injection hole K near the end of the insulating member 120 with a preset pressure along the axial direction of the injection hole K, thereby allowing the insulating member 120 to be in a sealed state under normal conditions, which can improve the safety and reliability of the battery cell 100.

[0102] In some embodiments, one of the first connector 1111 and the second connector 122 includes a snap-fit ​​element, and the other of the first connector 1111 and the second connector 122 is provided with a slot adapted to the snap-fit ​​element.

[0103] Alternatively, the first connector 1111 may include a snap-fit ​​component, and the second connector 122 may have a slot adapted to the snap-fit ​​component; or the second connector 122 may include a snap-fit ​​component, and the first connector 1111 may have a slot adapted to the snap-fit ​​component.

[0104] For example, the second connector 122 includes a snap-fit ​​element, and the first connector 1111 has a slot adapted to the snap-fit ​​element.

[0105] The snap-fit ​​component can be a snap-fit ​​post, and the snap-fit ​​slot can be adapted to the snap-fit ​​post.

[0106] In this way, by snapping the first connector 1111 and the second connector 122 together, the insulating member 120 can be connected to the inner side of the first wall 111, and the one-way sealing structure 121 can be pressed against the side wall of the injection hole K near the insulating member 120 with a preset pressure along the axial direction of the injection hole K, thereby improving the safety and reliability of the battery cell 100.

[0107] Optionally, multiple second connectors 122 are provided, and multiple slots are provided on the first connector 1111, with the second connectors 122 correspondingly engaging with the slots.

[0108] In this way, the insulating component 120 can be connected to the inner side of the first wall 111 more evenly and stably, while also improving the connection reliability of the one-way sealing structure 121 to the side wall of the injection hole K near the insulating component 120, thereby improving the safety and reliability of the battery cell 100.

[0109] In some embodiments, the insulating member 120 further includes a main structure 123 surrounding the one-way sealing structure 121, and a second connecting member 122 is disposed on the main structure 123. Specifically, all second connecting members 122 are disposed on the main structure 123. Along the axial direction of the injection hole K, a plurality of fluid channels T are provided through the main structure 123. When the insulating member 120 is in a non-sealed state, the injection hole K is also connected to the plurality of fluid channels T.

[0110] The main structure 123 refers to the structure on the insulating member 120 that can surround the one-way sealing structure 121 and is used to install the second connecting member 122.

[0111] The fluid channel T refers to a channel that runs through the main structure 123 and is connected to the injection hole K when the insulating part 120 is in a non-sealed state.

[0112] When the insulating component 120 is in a non-sealed state, the electrolyte flowing into the injection hole K can flow into the interior of the battery cell 100 through the injection channel Z and the fluid channel T, which can effectively disperse the electrolyte and reduce the impact force formed by the electrolyte, thereby improving the safety and reliability of the battery cell 100.

[0113] It is understandable that, along the radial direction of the injection hole K, the fluid channel T is located outside the injection channel Z.

[0114] In this way, the electrolyte can flow outward along the radial direction of the injection hole K into the internal space of the battery cell 100, thereby reducing the impact force formed by the electrolyte and improving the safety of the battery cell 100.

[0115] In some embodiments, at least the one-way sealing structure 121 in the insulating member 120 is elastic.

[0116] Alternatively, the insulating element 120 may be elastic; or the one-way sealing structure 121 in the insulating element 120 may be elastic.

[0117] The elasticity of the one-way sealing structure 121 refers to its ability to deform under external force and return to its original shape after the external force is removed. For example, the one-way sealing structure 121 can deform under the connecting force between the insulating member 120 and the first wall 111, so that the one-way sealing structure 121 abuts against the side wall of the injection hole K near the insulating member 120 with a preset pressure along the axial direction of the injection hole K. Another example is that the one-way sealing structure 121 can deform under the pressure of the fluid flowing into the injection hole K, thereby switching the insulating member 120 from a sealed state to a non-sealed state.

[0118] It is possible that, in the insulating element 120, at least the one-way sealing structure 121 has elasticity and toughness.

[0119] For example, the insulating element 120 is made of polypropylene (PP), polycarbonate (PC), polyethylene terephthalate and carbon fiber composite (PET-CF), or carbon fiber reinforced conductive polyester (ET-CF or ETFE-CF).

[0120] Thus, during the process of injecting electrolyte into the battery cell 100, the electrolyte flows into the injection hole K under a certain pressure, which causes at least one-way sealing structure 121 in the insulating component 120 to deform under the pressure, thereby causing at least a portion of the one-way sealing structure 121 to separate from the sidewall of the injection hole K. In this way, the insulating component 120 can be effectively driven to switch from a sealed state to a non-sealed state.

[0121] In some embodiments, the orthographic projection of the injection channel Z on the target plane does not overlap with the orthographic projection of the injection hole K on the target plane, and in a direction parallel to the target plane, the orthographic projection of the injection channel Z on the target plane is located outside the orthographic projection of the injection hole K on the target plane, and the target plane is perpendicular to the thickness direction of the first wall 111.

[0122] Thus, during the electrolyte injection process of the battery cell 100, the insulating component 120 can switch from a sealed state to a non-sealed state in response to the pressure of the fluid flowing into the injection hole K. This allows the electrolyte flowing into the injection hole K to flow into the interior of the battery cell 100 through the injection channel Z. Since the injection channel Z is located outside the injection hole K in a direction parallel to the target plane, the electrolyte flowing into the injection hole K can flow into the interior of the battery cell 100 through the injection channel Z, which is further outward along the radial direction of the injection hole K. This allows the electrolyte to flow outward and disperse into the interior space of the battery cell 100 in the radial direction of the injection hole K, which can reduce the impact of this part of the electrolyte on the electrode sheets and other components inside the battery cell 100. It can also reduce the risk of the electrolyte directly hitting the inner side of the coil of the electrode assembly 130, thereby improving the reliability of the battery cell 100.

[0123] In some embodiments, the surrounding part 1212 is provided with a plurality of injection channels Z, which are arranged at intervals around the central axis of the injection hole K.

[0124] During the process of injecting electrolyte into the battery cell 100, multiple injection channels Z can be used to better disperse the electrolyte flowing into the injection hole K, thereby reducing the impact of this electrolyte on the electrode sheets inside the battery cell 100 and reducing the risk of electrolyte directly hitting the inner side of the electrode assembly 130, thus improving the reliability of the battery cell 100.

[0125] In some embodiments, along the radial direction of the injection hole K, each injection channel Z has a first end and a second end disposed opposite to each other, and the first end to the second end of each injection channel Z extends in a curved manner.

[0126] Along the circumferential direction of multiple injection channels Z, each subsequent injection channel Z rotates relative to the preceding injection channel Z by a preset angle in a preset rotation direction. The preset rotation direction can be clockwise or counterclockwise. The preset angle is 30-40 degrees; for example, the preset angles are 30 degrees, 32 degrees, 34 degrees, 36 degrees, 38 degrees, or 40 degrees.

[0127] Optionally, the injection channel Z extends from its first end to its second end, and the sidewall of the injection channel Z includes multiple connected arc-shaped sub-sidewalls, with adjacent arc-shaped sub-sidewalls having different bending directions.

[0128] It is understood that the multiple injection channels Z are arranged in a spiral shape, and the first end of each injection channel Z extends in a curved manner from the second end, so that the one-way sealing structure 121 acts like a spiral spring. This allows the one-way sealing structure 121 to respond more quickly to the pressure of the fluid flowing into the injection hole K and switch from a sealed state to a non-sealed state, thereby improving the safety, injection efficiency and injection convenience of the battery cell 100.

[0129] In some embodiments, all injection channels Z are arranged to form multiple groups of injection channels arranged from the inside out around the central axis of the injection hole K. Each injection channel group includes multiple injection channels Z arranged at intervals around the central axis of the injection hole K.

[0130] Multiple sets of electrolyte injection channels are arranged from the inside out. The multiple electrolyte injection channels Z in each set are evenly distributed around the electrolyte injection hole K. This allows the electrolyte flowing into the electrolyte injection hole K to flow more evenly into the internal space of the battery cell 100. In addition, the multiple electrolyte injection channels Z can dissipate the impact force of the electrolyte and better reduce the risk of the electrolyte directly hitting the inner side of the electrode assembly 130, thereby improving the reliability of the battery cell 100.

[0131] In some embodiments, the sidewall of the injection channel Z is arranged around the central axis of the injection channel Z, and the direction from the center of the injection channel Z to the sidewall of the injection channel Z is such that the size of the injection channel Z is less than or equal to 0.5 mm.

[0132] The cross-section of the injection channel Z can be circular or rectangular, etc.

[0133] For example, the dimensions of the injection channel Z are 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm, along the direction from the center of the injection channel Z to the side wall of the injection channel Z.

[0134] Because the injection channel Z is relatively small in size, pointing from the center of the injection channel Z to the side wall of the injection channel Z, it can achieve a certain filtering effect and effectively filter the electrolyte.

[0135] In some embodiments, the sealing portion 1211 has a sealing surface 12111 perpendicular to the axial direction of the injection hole K. When the insulating member 120 is in a sealed state, the sealing surface 12111 is sealed to one end of the sidewall of the injection hole K near the insulating member 120.

[0136] The sealing surface 12111 refers to one end face of the sealing part 1211 used to seal the side wall connected to the injection hole K.

[0137] Since the sealing surface 12111 is perpendicular to the axial direction of the injection hole K, and the sealing surface 12111 is sealed to the end of the side wall of the injection hole K near the insulating member 120, the sealing surface 12111 can contact the end of the side wall of the injection hole K near the insulating member 120 more. This is beneficial for the one-way sealing structure 121 to better abut against the end of the side wall of the injection hole K near the insulating member 120 with a preset pressure along the axial direction of the injection hole K. This can improve the sealing reliability of the insulating member 120 connected to the side wall of the injection hole K in the sealed state, thereby better reducing the risk of foreign objects falling into the battery cell and the risk of electrolyte leakage, thus improving the safety of the battery cell 100.

[0138] In such Figures 4-7 In the embodiment shown, a plurality of injection channels Z are provided on the surrounding part 1212. All injection channels Z are spaced apart around the central axis of the injection hole K, and each injection channel Z extends in a curved manner from one end near the sealing part 1211 to the other end.

[0139] Along the circumferential direction of multiple injection channels Z, each subsequent injection channel Z rotates relative to the preceding injection channel Z by a preset angle in a preset rotation direction. The preset rotation direction can be clockwise or counterclockwise. The preset angle is 30-40 degrees; for example, the preset angles are 30 degrees, 32 degrees, 34 degrees, 36 degrees, 38 degrees, or 40 degrees.

[0140] Optionally, along the injection channel Z from one end near the sealing part 1211 to the other end, the sidewall of the injection channel Z includes a plurality of connected arc-shaped sub-sidewalls, and the bending directions of two adjacent arc-shaped sub-sidewalls are different.

[0141] The subsequent liquid injection channel Z rotates by a preset angle relative to the previous liquid injection channel Z in a preset rotation direction, so that the one-way sealing structure 121 acts like a spiral spring. This allows the one-way sealing structure 121 to respond more quickly to the pressure of the fluid flowing into the liquid injection hole K and switch from a sealed state to a non-sealed state, thereby improving the safety, liquid injection efficiency, and liquid injection convenience of the battery cell 100.

[0142] In some embodiments, the surrounding portion 1212 includes a plurality of sub-surrounding portions 12121, which are disposed around the sealing portion 1211 from the inside out. The sub-surrounding portions 12121 that are farther away from the sealing portion 1211 are farther away from the injection hole K along the axial direction of the injection hole K.

[0143] It is understood that two adjacent sub-surrounding portions 12121 form an annular stepped shape, and multiple sub-surrounding portions 12121 form an annular stepped shape. In this way, the one-way sealing structure 121 can play a role similar to a disc spring. This is beneficial for the one-way sealing structure 121 to better abut against the side wall of the injection hole K near the end of the insulating member 120 with a preset pressure along the axial direction of the injection hole K. It is also beneficial for the one-way sealing structure 121 to respond more quickly to the pressure of the fluid flowing into the injection hole K and switch from a sealed state to a non-sealed state. Moreover, the one-way sealing structure 121 can be compressed into a plane in response to the pressure of the fluid flowing into the injection hole K, so that the height dimension occupied by the one-way sealing structure 121 after compression is relatively low. This is beneficial for the electrolyte to flow into the battery cell 100 through the space between the one-way sealing structure 121 and the side wall of the injection hole K and the injection channel Z, which can improve the safety, injection efficiency and injection convenience of the battery cell 100.

[0144] It can be, such as Figures 8-11 As shown, each sub-surrounding part 12121 is provided with multiple liquid injection channels Z arranged at intervals around the sealing part 1211.

[0145] Thus, during the process of the one-way sealing structure 121 being compressed in a plane in response to the pressure of the fluid flowing into the injection hole K, the innermost sub-surrounding portion 12121 is compressed first, and the outermost sub-surrounding portion 12121 is compressed first. The electrolyte can be evenly dispersed through the multiple injection channels Z on each sub-surrounding portion 12121. In this way, the multiple injection channels Z can dissipate the impact force of the electrolyte and better reduce the risk of the electrolyte directly hitting the inner surface of the electrode assembly 130, thereby improving the reliability of the battery cell 100.

[0146] It could also be, such as Figures 12-15 As shown, a plurality of injection channels Z are provided through the surrounding part 1212 along the axial direction of the injection hole K. All injection channels Z are arranged at intervals around the central axis of the injection hole K, and each injection channel Z extends in a curved manner from one end near the sealing part 1211 to the other end.

[0147] Along the circumferential direction of multiple injection channels Z, each subsequent injection channel Z rotates relative to the preceding injection channel Z by a preset angle in a preset rotation direction. The preset rotation direction can be clockwise or counterclockwise. The preset angle is 30-40 degrees; for example, the preset angles are 30 degrees, 32 degrees, 34 degrees, 36 degrees, 38 degrees, or 40 degrees.

[0148] Optionally, along the injection channel Z from one end near the sealing part 1211 to the other end, the sidewall of the injection channel Z includes a plurality of connected arc-shaped sub-sidewalls, and the bending directions of two adjacent arc-shaped sub-sidewalls are different.

[0149] Thus, the one-way sealing structure 121 can function similarly to a stacked spring, which helps the one-way sealing structure 121 respond more quickly to the pressure of the fluid flowing into the injection hole K and switch from a sealed state to a non-sealed state. Moreover, the subsequent injection channel Z rotates at a preset angle relative to the previous injection channel Z in a preset rotation direction. Therefore, the electrolyte flowing into the injection hole K can be dispersed in a spiral shape in the peripheral area below the injection hole K through the injection channel Z, and also dispersed in a spiral shape inside the battery cell 100. This can effectively dissipate the impact force of the electrolyte and reduce the risk of the electrolyte directly hitting the inner surface of the electrode assembly 130, thereby improving the reliability of the battery cell 100.

[0150] In such Figures 12-15In the illustrated embodiment, the sub-surrounding portion 12121 closest to the sealing portion 1211 may be flush with the surface of the sealing portion 1211 near the first wall 111; alternatively, the insulating member 120 may also include a main body structure 123 surrounding the one-way sealing structure 121, with the end of the injection channel Z away from the sealing portion 1211 extending onto the main body structure 123 and penetrating the main body structure 123 along the axial direction of the injection hole K; alternatively, the sub-surrounding portion 12121 closest to the sealing portion 1211 may be flush with the surface of the sealing portion 1211 near the first wall 111; the insulating member 120 may also include a main body structure 123 surrounding the one-way sealing structure 121, with the end of the injection channel Z away from the sealing portion 1211 extending onto the main body structure 123 and penetrating the main body structure 123 along the axial direction of the injection hole K.

[0151] Since the sub-surrounding portion 12121 closest to the sealing portion 1211 is flush with the surface of the sealing portion 1211 near the first wall 111, the electrolyte flowing into the injection hole K can flow into the injection channel Z relatively quickly and disperse outward in a spiral shape from the end of the injection channel Z near the sealing portion 1211. This can effectively dissipate the impact force of the electrolyte, reduce the risk of the electrode assembly 130 being washed away and the separator wrinkling, improve the wetting effect of the electrolyte, reduce the risk of black spots and short circuits on the electrode surface, and thus improve the reliability of the battery cell 100.

[0152] Since the end of the injection channel Z furthest from the sealing part 1211 extends to the main structure 123 and is arranged through the main structure 123 along the axial direction of the injection hole K, the end of the injection channel Z furthest from the sealing part 1211 is farther from the center of the injection hole K. This makes it more conducive for the electrolyte flowing into the injection hole K to be dispersed in a spiral shape in the peripheral area below the injection hole K. This can effectively dissipate the impact force of the electrolyte, reduce the risk of the electrode assembly 130 being washed away and the separator wrinkling, improve the wetting effect of the electrolyte, reduce the risk of black spots and short circuits on the electrode surface, and thus improve the reliability of the battery cell 100.

[0153] In some embodiments, the battery cell further includes a sealant (not shown) disposed between the sealing portion 1211 and the sidewall of the injection hole K near the end of the insulating member 120.

[0154] The sealant refers to the adhesive that can be bonded to the side wall of the sealing part 1211 near the injection hole K. When the surface of the side wall of the sealing part 1211 near the injection hole K is not very smooth, the smoother sealant can make more contact with the side wall of the injection hole K, thereby improving the sealing reliability between the one-way sealing structure 121 and the side wall of the injection hole K.

[0155] Of course, this application is not limited to this. When the sealing part 1211 is relatively flat, the sealing part 1211 can also directly abut against the side wall of the injection hole K near the end of the insulating member 120 along the axial direction of the injection hole K, so that the sealing part 1211 is sealed and connected to the side wall of the injection hole K near the end of the insulating member 120.

[0156] In some embodiments, when the insulating member 120 is in a sealed state, the one-way sealing structure 121 is recessed toward the side closer to the injection hole K along the axial direction of the injection hole K.

[0157] Thus, under normal conditions, the one-way sealing structure 121 can easily abut against the side wall of the injection hole K near the end of the insulating member 120, thereby sealing the end of the injection hole K near the insulating member 120. If the one-way sealing structure 121 has toughness or elasticity, it can also be compressed and positioned on the side wall of the injection hole K near the end of the insulating member 120. This allows the one-way sealing structure 121 to abut against the side wall of the injection hole K near the end of the insulating member 120 with a preset pressure under the reverse action of deformation, thereby improving the sealing reliability of the insulating member 120 in the sealed state.

[0158] In some embodiments, the insulating element 120 is a 3D-printed, one-piece structure.

[0159] The insulating component 120 is made of a material that can be 3D printed and has toughness or elasticity.

[0160] For example, the insulating element 120 is made of polypropylene (PP), polycarbonate (PC), polyethylene terephthalate and carbon fiber composite (PET-CF), or carbon fiber reinforced conductive polyester (ET-CF or ETFE-CF).

[0161] The insulating component 120 is formed by 3D printing. The structure of the insulating component 120 and the one-way sealing structure 121 is no longer limited by the manufacturing cost and difficulty of the mold. The one-way sealing structure 121 and the insulating component 120 can be designed according to the design requirements, which is beneficial to improving the safety and reliability of the battery cell 100 to a certain extent.

[0162] In some embodiments, in the insulating element 120, at least the one-way sealing structure 121 has toughness or elasticity.

[0163] In this way, the insulating member 120 and the first wall 111 can be mated together so that the one-way sealing structure 121 is in a compressed state. Then, under the reverse action of deformation, the one-way sealing structure 121 can press against the side wall of the injection hole K near the end of the insulating member 120 with a preset pressure along the axial direction of the injection hole K. When the insulating member 120 is in a sealed state, it is beneficial for the one-way sealing structure 121 to seal the end of the injection hole K near the insulating member 120. Combined with the fact that the insulating member 120 can switch from a sealed state to a non-sealed state in response to the pressure of the fluid flowing into the injection hole K, the safety of the battery cell 100 can be improved while meeting the injection requirements of the battery cell 100.

[0164] One embodiment of this application provides a battery device 10, including a battery cell 100 from any of the above embodiments.

[0165] One embodiment of this application provides an electrical device including the battery device 10 described above.

[0166] 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.

[0167] 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, characterized in that, include: The outer casing (110) includes a first wall (111) having a liquid injection hole (K); and An insulating member (120) is disposed on the inner side of the first wall (111) along the thickness direction of the first wall (111); and the insulating member (120) includes a one-way sealing structure (121), on which a liquid injection channel (Z) is provided; and at least the one-way sealing structure (121) of the insulating member (120) is elastic; The one-way sealing structure (121) includes a sealing part (1211) and a surrounding part (1212) surrounding the sealing part (1211); the injection channel (Z) is formed on the surrounding part (1212); the sealing part (1211) is sealed to one end of the sidewall of the injection hole (K) near the insulating member (120); The surrounding portion (1212) is provided with a plurality of injection channels (Z), which are spaced apart around the central axis of the injection hole (K); along the radial direction of the injection hole (K), each injection channel (Z) has a first end and a second end disposed opposite to each other, and the first end to the second end of each injection channel (Z) extends in a curved manner; along the circumferential direction of the plurality of injection channels (Z), the subsequent injection channel (Z) is rotated relative to the previous injection channel (Z) by a preset angle according to a preset rotation direction; or The surrounding portion (1212) includes a plurality of sub-surrounding portions (12121), which are arranged around the sealing portion (1211) from the inside out, and the further away the sub-surrounding portion is from the sealing portion (1211), the farther away it is from the injection hole (K) along the axial direction of the injection hole (K); The insulating component (120) is a one-piece molded structure.

2. The battery cell according to claim 1, characterized in that, The insulating element (120) has a sealed state and an unsealed state; When the insulating member (120) is in the sealed state, the one-way sealing structure (121) abuts against the side wall of the injection hole (K) near the insulating member (120) with a preset pressure along the axial direction of the injection hole (K), so that the sealing part (1211) is sealed to the side wall of the injection hole (K) near the insulating member (120); When the insulating element (120) is in the unsealed state, at least a portion of the sealing part (1211) is separated from the sidewall of the injection hole (K), and the injection hole (K) is connected to the injection channel (Z). The insulating element (120) can switch from the sealed state to the unsealed state in response to the pressure of the fluid flowing into the injection hole (K).

3. The battery cell according to claim 2, characterized in that, The first wall (111) includes a first connector (1111); The insulating element (120) also includes a second connector (122) located radially outside the one-way sealing structure (121) along the injection hole (K). Along the thickness direction of the first wall (111), the insulating member (120) is connected to the inner side of the first wall (111) by means of the second connector (122) and the first connector (1111), so that the one-way sealing structure (121) abuts against the side wall of the injection hole (K) near the end of the insulating member (120) with a preset pressure along the axial direction of the injection hole (K).

4. The battery cell according to claim 3, characterized in that, The insulating element (120) also includes a main structure (123) surrounding the one-way sealing structure (121). The second connector (122) is disposed on the main structure (123); Along the axial direction of the injection hole (K), a plurality of fluid channels (T) are provided through the main structure (123). When the insulating member (120) is in the unsealed state, the injection hole (K) is also connected to the plurality of fluid channels (T).

5. The battery cell according to claim 2, characterized in that, When the insulating element (120) is in the sealed state, the one-way sealing structure (121) is recessed toward the side closer to the injection hole (K) along the axial direction of the injection hole (K).

6. The battery cell according to any one of claims 1-5, characterized in that, The orthographic projection of the injection channel (Z) on the target plane does not overlap with the orthographic projection of the injection hole (K) on the target plane, and in a direction parallel to the target plane, the orthographic projection of the injection channel (Z) on the target plane is located outside the orthographic projection of the injection hole (K) on the target plane; The target plane is perpendicular to the thickness direction of the first wall (111).

7. The battery cell according to any one of claims 1-5, characterized in that, All of the injection channels (Z) are arranged to form multiple groups of injection channels arranged from the inside out around the central axis of the injection hole (K); Each of the injection channel groups includes a plurality of injection channels (Z) spaced apart around the central axis of the injection hole (K).

8. The battery cell according to any one of claims 1-5, characterized in that, The sealing part (1211) has a sealing surface (12111) perpendicular to the axial direction of the injection hole (K). The sealing surface (12111) is sealed to one end of the sidewall of the injection hole (K) near the insulating element (120).

9. The battery cell according to any one of claims 1-5, characterized in that, When all the sub-surrounding portions are arranged around the sealing portion (1211) from the inside out, each sub-surrounding portion (12121) is provided with a plurality of injection channels (Z) spaced apart around the sealing portion (1211).

10. The battery cell according to claim 9, characterized in that, Along the axial direction of the injection hole (K), a plurality of injection channels (Z) are provided through the surrounding part (1212). All of the injection channels (Z) are arranged at intervals around the central axis of the injection hole (K), and each injection channel (Z) extends in a curved manner from one end near the sealing part (1211) to the other end. Along the circumferential direction of the plurality of injection channels (Z), the latter injection channel (Z) rotates relative to the former injection channel (Z) by a preset angle in a preset rotation direction.

11. The battery cell according to claim 10, characterized in that, The sub-surrounding portion (12121) closest to the sealing portion (1211) is flush with the surface of the sealing portion (1211) near the first wall (111); and / or The insulating element (120) also includes a main body structure (123) surrounding the one-way sealing structure (121); the end of the injection channel (Z) away from the sealing part (1211) extends to the main body structure (123) and is disposed through the main body structure (123) along the axial direction of the injection hole (K).

12. The battery cell according to any one of claims 1-5, characterized in that, The battery cell also includes a sealant, which is disposed between the sealing part (1211) and the side wall of the injection hole (K) near the end of the insulating member (120).

13. The battery cell according to any one of claims 1-5, characterized in that, The insulating component (120) is a 3D-printed, one-piece structure.

14. A battery device, characterized in that, Includes the battery cell described in any one of claims 1-13.

15. An electrical appliance, characterized in that, Includes the battery device as described in claim 14.

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