Battery cell and battery device, electric device

Abstract

The application relates to the battery technical field and discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly, a pole and a sealing piece. The shell comprises a first shell wall, the pole is arranged on the first shell wall and is electrically connected with the electrode assembly, the pole defines a liquid injection cavity, the liquid injection cavity has a cavity bottom wall, a cavity peripheral wall and a cavity opening, the cavity opening is located on the side of the cavity bottom wall away from the electrode assembly, the cavity peripheral wall is arranged on the outer periphery of the cavity bottom wall and is provided with a supporting boss, the sealing piece is supported on the supporting boss and is connected with the cavity peripheral wall to form a connecting part, the cavity bottom wall is provided with a liquid injection hole, the supporting boss has a plurality of drainage grooves, the plurality of drainage grooves are arranged at intervals in the circumferential direction of the liquid injection hole, and the drainage grooves extend from the supporting boss to the side surface of the sealing piece in the direction away from the connecting part. In the technical scheme of the application, the residual electrolyte on the supporting boss is reduced, the connection reliability of the sealing piece and the pole is improved, and the electrolyte leakage is reduced.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a battery cell, battery device, and electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In related technologies, the connection quality between the terminal and the seal of a battery cell is affected by residual electrolyte, which can cause the seal to warp and seriously affect the reliability of the battery cell. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery, and an electrical device that can improve the connection reliability between the terminal and the seal, and improve the reliability of the battery cell in use.

[0005] In a first aspect, this application provides a battery cell, comprising: a housing, the housing including a first housing wall; an electrode assembly disposed within the housing; a terminal post disposed on the first housing wall and electrically connected to the electrode assembly, the terminal post defining an injection cavity, the injection cavity having a bottom wall, a peripheral wall, and an opening, the opening being located on the side of the bottom wall away from the electrode assembly, the peripheral wall being disposed on the outer periphery of the bottom wall and having a supporting boss; and a seal supporting the supporting boss and connected to the peripheral wall to form a connection portion; wherein the bottom wall has an injection hole, the supporting boss has multiple drainage grooves arranged circumferentially at intervals around the injection hole, and the drainage grooves extending from the surface of the supporting boss toward the seal portion in a direction away from the connection portion.

[0006] In the technical solution of this application embodiment, by setting multiple drainage grooves on the support boss and extending the drainage grooves in a direction away from the connection part, the electrolyte falling on the support boss can be guided away from the cavity peripheral wall and the connection position of the seal by the drainage grooves, based on the fact that the support boss can stably support the seal. This reduces the electrolyte residue on the support boss, thereby improving the connection reliability between the seal and the terminal, reducing electrolyte leakage, and extending the service life of the battery cell. When the seal and the terminal are welded together, the drainage grooves can guide the electrolyte falling on the support boss away from the welding position of the terminal, reducing the generation of welding defects such as pinhole bursts caused by the thermal effect of the electrolyte. This helps to reduce the number of hidden pores in the connection part formed by the welding of the seal and the terminal, thereby improving the welding reliability of the seal and the terminal.

[0007] In some embodiments, multiple drainage channels are evenly and spaced apart circumferentially around the injection hole. In the above technical solution, arranging multiple drainage channels evenly and spaced apart circumferentially around the injection hole ensures that the multiple first protrusions forming the drainage channels are also evenly and spaced apart circumferentially around the injection hole. This allows the multiple first protrusions to support the seal, improving the installation reliability and stability of the seal. Furthermore, the drainage channels at different positions can guide the electrolyte falling on the corresponding positions of the supporting protrusions to a connection point away from the cavity wall and the seal, reducing electrolyte residue and improving the connection reliability between the seal and the electrode.

[0008] In some embodiments, the support boss includes a plurality of first protrusions arranged circumferentially at intervals around the injection hole, with a drainage groove defined between adjacent first protrusions; wherein the seal is supported on the side of the plurality of first protrusions facing the cavity opening. In the above technical solution, by setting the support boss to include a plurality of first protrusions, a plurality of drainage grooves can be defined using the plurality of first protrusions. Based on the stable support of the seal using the plurality of first protrusions, the electrolyte falling on the corresponding position of the support boss can be guided away from the connection position between the cavity wall and the seal using drainage grooves at different positions, thereby improving the connection reliability between the seal and the electrode post.

[0009] In some embodiments, a plurality of first protrusions are evenly and spaced apart circumferentially around the injection hole. In the above technical solution, arranging a plurality of first protrusions evenly and spaced apart circumferentially around the injection hole results in a plurality of drainage grooves being evenly and spaced apart circumferentially around the injection hole. This allows the multiple first protrusions to support the seal, improving the installation reliability and stability of the seal. Furthermore, the drainage grooves at different positions can evenly guide the electrolyte falling on the corresponding positions of the supporting protrusions to the connection position away from the cavity wall and the seal, thereby improving the connection reliability between the seal and the electrode.

[0010] In some embodiments, the number of first protrusions is greater than or equal to four. In the above technical solution, by limiting the number of first protrusions to greater than or equal to four, the surface area of ​​the side of the support boss facing the seal can be increased, thereby increasing the contact area between the support boss and the seal, which in turn improves the support effect of the support boss on the seal and significantly improves the installation reliability and stability of the seal on the support boss.

[0011] In some embodiments, the inner surface of the cavity peripheral wall includes a first surface, which is an annular surface extending circumferentially along the cavity bottom wall. The first surface extends obliquely from the outside to the inside towards the cavity bottom wall in the radial direction of the injection hole. A plurality of first protrusions protrude from the first surface. The first surface can guide the electrolyte falling onto the support protrusion away from the connection point between the cavity peripheral wall and the seal, reducing electrolyte residue on the support protrusion and thus improving the connection reliability between the seal and the electrode.

[0012] In some embodiments, the support boss further includes: a second protrusion, which protrudes from the inner surface of the cavity peripheral wall and is an annular boss extending circumferentially along the bottom wall of the cavity. The surface of the second protrusion facing the central axis of the injection cavity is a second surface, and a plurality of first protrusions protrude from the second surface. The seal is supported on the side of the plurality of first protrusions facing the cavity opening and the side of the second protrusions facing the cavity opening. In the above technical solution, by setting the support boss to include a plurality of first protrusions and second protrusions, the seal can be supported by the plurality of first protrusions and second protrusions, increasing the contact area between the support boss and the seal, thereby improving the installation reliability and stability of the seal. Furthermore, the plurality of first protrusions and second protrusions can define a plurality of drainage grooves, which can be used to guide the electrolyte falling on the support boss away from the connection position between the cavity peripheral wall and the seal, improving the connection reliability between the seal and the electrode.

[0013] In some embodiments, the second surface extends radially from the outside to the inside of the injection hole, towards the bottom wall of the cavity. This second surface guides the electrolyte falling onto the support boss away from the connection point between the cavity wall and the seal, reducing electrolyte residue on the support boss and thus improving the connection reliability between the seal and the electrode, thereby reducing electrolyte leakage.

[0014] In some embodiments, the space between the seal and the bottom wall of the cavity connects the injection hole and the drainage groove. In the above technical solution, by defining the space between the seal and the bottom wall of the cavity to connect the injection hole and the drainage groove, the drainage groove can guide the electrolyte falling on the support boss in a direction away from the connection position between the cavity peripheral wall and the seal, and finally drain it into the space between the seal and the bottom wall of the cavity, reducing electrolyte residue on the support boss, thereby improving the connection reliability between the seal and the electrode.

[0015] In some embodiments, the area of ​​the side surface of the support boss facing the seal is S1, and the area of ​​the annular region containing the side surface of the support boss facing the seal is S2. The ratio of S1 to S2 is greater than or equal to 0.5 and less than 1. In the above technical solution, by limiting the ratio of S1 to S2 to be greater than or equal to 0.5, while ensuring that the electrolyte on the support boss flows into the drainage groove in a direction away from the connection position between the cavity peripheral wall and the seal, the surface area of ​​the side surface of the support boss facing the seal can be increased. This increases the contact area between the support boss and the seal, thereby improving the support effect of the support boss on the seal and significantly improving the installation reliability and stability of the seal on the support boss.

[0016] In some embodiments, the projected shape of the drainage channel along the axial direction of the injection chamber is rectangular, trapezoidal, triangular, or semi-circular. The projected shape of the drainage channel along the axial direction of the injection chamber can be selected as needed.

[0017] In some embodiments, the drainage channel includes a first channel sidewall and a second channel sidewall, which are disposed opposite to each other in the circumferential direction of the injection chamber.

[0018] In some embodiments, the drainage channel further includes a third channel sidewall, which connects the first channel sidewall and the second channel sidewall in the circumferential direction of the injection cavity. The third channel sidewall extends radially from the outside to the inside towards the bottom wall of the cavity. In the above technical solution, by setting the third channel sidewall to extend radially from the outside to the inside towards the bottom wall of the cavity, the electrolyte falling on the support boss can be guided away from the connection point between the cavity peripheral wall and the seal, reducing electrolyte residue on the support boss. This improves the connection reliability between the seal and the electrode, thereby reducing electrolyte leakage.

[0019] In some embodiments, the first groove sidewall extends obliquely towards the bottom wall of the injection cavity in the circumferential direction of the injection cavity, along a direction close to the second groove sidewall; and / or, the second groove sidewall extends obliquely towards the bottom wall of the injection cavity in the circumferential direction of the injection cavity, along a direction close to the first groove sidewall. In the above technical solution, by setting the first groove sidewall to extend obliquely towards the bottom wall of the injection cavity in the circumferential direction of the injection cavity, the electrolyte falling on the support boss can be guided away from the connection position between the cavity peripheral wall and the seal, reducing electrolyte residue on the support boss, thereby improving the connection reliability between the seal and the electrode, and thus reducing electrolyte leakage; by setting the second groove sidewall to extend obliquely towards the bottom wall of the injection cavity in the circumferential direction of the injection cavity, the electrolyte falling on the support boss can be guided away from the connection position between the cavity peripheral wall and the seal, reducing electrolyte residue on the support boss, thereby improving the connection reliability between the seal and the electrode, and thus reducing electrolyte leakage.

[0020] In some embodiments, the seal is provided with a venting channel that extends through both ends of the seal in the injection chamber along its axial direction. A sealing element is provided at the opening of the venting channel away from the bottom wall of the chamber. In the above technical solution, by providing a venting channel on the seal, the gas generated during welding can be discharged through the venting channel, thereby reducing porosity in the welded joint, which is beneficial to improving the quality of the joint and thus improving the connection reliability between the seal and the chamber wall. By providing a sealing element, the opening at the end of the venting channel away from the bottom wall of the chamber can be sealed, reducing electrolyte leakage and extending the service life of the battery cell.

[0021] In some embodiments, the two ends of the venting channel are a first opening and a second opening, respectively, and the projections of the first opening and the second opening along the axial direction of the injection chamber are at least partially non-overlapping. This configuration allows electrolyte vapor to escape from the venting channel while reducing the likelihood of laser leakage into the housing, thus minimizing laser damage to the electrode assembly.

[0022] In some embodiments, the venting channel is axially inclined relative to the injection chamber. In the above technical solution, arranging the venting channel axially inclined relative to the injection chamber reduces the probability of laser leakage from the venting channel into the housing, thereby reducing laser damage to the electrode assembly.

[0023] In some embodiments, the sealing element has a mounting groove on the side away from the bottom wall of the cavity, and an opening at one end of the venting channel is located in the bottom wall of the mounting groove; wherein, the size of the mounting groove is larger than the size of the opening at one end of the venting channel, and the sealing element is disposed within the mounting groove. In the above technical solution, by setting the size of the mounting groove to be larger than the size of the opening at one end of the venting channel, the probability of laser leakage from the venting channel into the housing can be reduced during the welding of the sealing element, thereby reducing laser damage to the electrode assembly.

[0024] Secondly, this application provides a battery device that includes the battery cell described in the above embodiments.

[0025] In the technical solution of this application embodiment, by using the above-mentioned battery cell, electrolyte leakage can be reduced and the service life of the battery device can be extended.

[0026] Thirdly, this application provides an electrical device that includes the battery cell in the above embodiments; or, it includes the battery device in the above embodiments.

[0027] In the technical solution of this application embodiment, by using the above-mentioned battery cell or battery device, electrolyte leakage can be reduced and the service life of the electrical device can be extended.

[0028] 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

[0029] 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: Figure 1 The electrical device shown in some embodiments of this application is a structural schematic diagram of a vehicle; Figure 2 This is a schematic diagram of the structure of a battery device according to some embodiments of this application; Figure 3 This is a structural cross-sectional view of a partial structure of a battery cell according to some embodiments of this application; Figure 4 for Figure 3 The diagram shows the assembly of the pole and the seal. Figure 5 for Figure 4 The structural cross-sectional view of the pole and seal shown; Figure 6 This is a schematic diagram of the terminal post structure of a battery cell according to some embodiments of this application; Figure 7 for Figure 6 An enlarged view of part A shown in the image; Figure 8 This is a schematic diagram of the terminal post structure of a battery cell in some other embodiments of this application; Figure 9 for Figure 8 An enlarged view of part B shown in the diagram; Figure 10 for Figure 8 The projection of the support boss shown in the diagram along the axial direction of the injection cavity; Figure 11 This is a schematic diagram of the terminal post structure of a battery cell according to some embodiments of this application; Figure 12 for Figure 11 An enlarged view of section C shown in the diagram; Figure 13 for Figure 6 A top view of the pole shown; Figure 14 for Figure 13 The structural cross-sectional view of the pole shown; Figure 15 This is a cross-sectional view of the terminal post structure of a battery cell in some embodiments of this application; Figure 16 This is a cross-sectional view of the terminal post of a battery cell according to other embodiments of this application.

[0030] The reference numerals in the detailed embodiments are as follows: Vehicle 1000; Battery unit 100; Controller 200; Motor 300; Box 40; Part 1 41; Part 2 42; 50 cells per battery. Shell 51; Shell body 511; Shell cover 512; First shell wall 513; Electrode assembly 52; 53. Electrode post; 531. Injection chamber; 5311. Bottom wall of chamber; 5312. Peripheral wall of chamber; 53121. First surface; 5313. Injection port; 5315. Support boss; 532. First protrusion; 5321. Second protrusion; 5322. Second surface; 53221. Drainage groove; 533. First groove sidewall; 5331. Second groove sidewall; 5332. Third groove sidewall; 5333. Body; 5341. First flange; 5342. Second flange; 5343. Seal 54; Connection 541; Air vent 542; First opening 5421; Second opening 5422; Mounting groove 543. Detailed Implementation

[0031] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0033] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0036] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0037] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0039] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0040] In related technologies, during the process of injecting electrolyte into the casing of a battery cell, the electrolyte may splash onto the annular protrusion on the inner circumferential wall of the terminal post. After the electrolyte injection is completed, a sealant is required to seal the terminal post. However, during the connection process between the sealant and the terminal post, such as during the welding process, the electrolyte that falls on the annular protrusion vaporizes due to heat and air expands, making it easy for the resulting gas to enter the welding position between the sealant and the terminal post. This results in pores in the weld, affecting the connection effect between the sealant and the terminal post. When the battery cell is working, the internal pressure of the casing increases, causing the weld formed by the connection between the sealant and the terminal post to crack. This makes the sealant prone to warping and other problems, leading to electrolyte leakage and seriously affecting the reliability of the battery cell.

[0041] To address the aforementioned issues, this application discloses a battery cell with multiple drainage grooves on a support boss. These drainage grooves extend away from the connection point. While the support boss provides stable support for the seal, the drainage grooves guide the electrolyte falling onto the support boss away from the cavity wall and the connection point of the seal, reducing electrolyte residue on the support boss. This improves the reliability of the connection between the seal and the terminal post, thereby reducing electrolyte leakage and extending the battery cell's lifespan.

[0042] The battery cells disclosed in this application can be used in electrical devices that use battery devices as a power source or in various energy storage systems that use battery devices as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0043] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0044] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000, representing some embodiments of this application. The vehicle 1000 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 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0045] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0046] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery device 100 according to some embodiments of this application. The battery device 100 includes a housing 40 and battery cells 50, with the battery cells 50 housed within the housing 40. Figure 2The X direction is the length direction of the box 40, the Y direction is the width direction of the box 40, and the Z direction is the height direction of the box 40.

[0047] The housing 40 provides a space for accommodating the battery cell 50, and can adopt various structures. In some embodiments, the housing 40 may include a first part 41 and a second part 42, which overlap each other, and together define a space for accommodating the battery cell 50. The second part 42 may be a hollow structure with one open end, and the first part 41 may be a plate-like structure, covering the open side of the second part 42 so that the first part 41 and the second part 42 together define the space; alternatively, the first part 41 and the second part 42 may both be hollow structures with one open side, with the open side of the first part 41 covering the open side of the second part 42. Of course, the housing 40 formed by the first part 41 and the second part 42 can be of various shapes, such as a cylinder, a cuboid, etc.

[0048] In the battery device 100, there can be multiple battery cells 50, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 50 are connected in both series and parallel connections. Multiple battery cells 50 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 50 is housed within the housing 40. Alternatively, the battery device 100 can also consist of multiple battery cells 50 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 40. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 50.

[0049] Each battery cell 50 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 50 can be cylindrical, flat, cuboid, or other shapes.

[0050] Please refer to Figure 3 , Figure 3 This is a structural cross-sectional view of a partial structure of a battery cell 50 according to some embodiments of this application. The battery cell 50 refers to the smallest unit constituting the battery device 100. For example... Figure 3 The battery cell 50 includes a housing 51 and an electrode assembly 52. ​​In some embodiments, the housing 51 includes a cover 512 and a body 511.

[0051] The cover 512 is a component that covers the opening of the housing 511 to isolate the internal environment of the battery cell 50 from the external environment. The shape of the cover 512 can be adapted to the shape of the housing 511 to fit it. Optionally, the cover 512 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the cover 512 is not easily deformed under pressure and impact, allowing the battery cell 50 to have higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on the cover 512. The electrode terminals can be used to electrically connect to the electrode assembly 52 for outputting or inputting electrical energy into the battery cell 50. In some embodiments, the cover 512 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 50 reaches a threshold. The material of the cover 512 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the cover 512. The insulating element can be used to isolate the electrical connection portion 541 inside the housing 511 from the cover 512 to reduce the risk of short circuit. For example, the insulating element may be made of plastic, rubber, etc.

[0052] The housing 511 is a component used to cooperate with the cover 512 to form the internal environment of the battery cell 50. This internal environment can accommodate the electrode assembly 52, electrolyte, and other components. The housing 511 and cover 512 can be independent components. An opening can be provided on the housing 511, and the cover 512 closes the opening to form the internal environment of the battery cell 50. Alternatively, the cover 512 and housing 511 can be integrated. Specifically, the cover 512 and housing 511 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 511, the cover 512 closes the housing 511. The housing 511 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 511 can be determined according to the specific shape and size of the electrode assembly 52. The shell 511 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0053] Electrode assembly 52 is disposed within housing 51 and is the component in the battery cell 50 where electrochemical reactions occur. Housing 51 may contain one or more electrode assemblies 52. Electrode assembly 52 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of electrode assembly 52, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of battery device 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0054] According to some embodiments of this application, refer to Figure 3 The housing 51 includes a first housing wall 513, and the battery cell 50 also includes an electrode post 53, which is disposed on the first housing wall 513 and electrically connected to the electrode assembly 52.

[0055] The first shell wall 513 here can be a shell cover 512 or a shell wall of the shell body 511. For example, it can be a shell wall that is set opposite to the shell body 511 and the shell cover 512.

[0056] Reference Figure 4 and Figure 5 , Figure 4 for Figure 3 The assembly diagram of the pole post 53 and the seal 54 shown; Figure 5 for Figure 4 The diagram shows a cross-sectional view of the electrode 53 and the seal 54. In some embodiments, the electrode 53 defines an injection chamber 531, which can be used to inject electrolyte into the housing 51.

[0057] Specifically, the injection chamber 531 has a bottom wall 5311, a peripheral wall 5312, and an opening 5313. The opening 5313 is located on the side of the bottom wall 5311 away from the electrode assembly 52. ​​The peripheral wall 5312 is located on the outer periphery of the bottom wall 5311 and has a supporting boss 532.

[0058] In some embodiments, the battery cell 50 further includes a seal 54, which is supported on the support boss 532 and connected to the cavity peripheral wall 5312 to form a connection portion 541.

[0059] The connection between the seal 54 and the electrode 53 can be achieved by welding, bonding, or other methods. After the seal 54 is connected to the electrode 53, the seal 54 can seal the opening 5313 of the injection chamber 531.

[0060] Reference Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of the terminal post 53 of the battery cell 50 in some embodiments of this application; Figure 7 for Figure 6 The enlarged view of part A shown. In some embodiments, the bottom wall 5311 of the cavity is provided with an injection hole 5315, and the support boss 532 has a plurality of drainage grooves 533. The plurality of drainage grooves 533 are arranged circumferentially at intervals in the injection hole 5315, and the drainage grooves 533 extend from the side surface of the support boss 532 toward the seal 54 in a direction away from the connection part 541.

[0061] The injection port 5315 here refers to the hole structure used for injecting electrolyte. Therefore, before injecting electrolyte, the injection port 5315 connects the inner cavity of the housing 51 and the injection chamber 531. During assembly, the electrode assembly 52 can be installed into the housing 51 first, and the cover 512 can be closed into the housing body 511. Then, electrolyte can be injected into the injection chamber 531. The electrolyte can enter the housing 51 through the injection port 5315, so that the electrode assembly 52 can be immersed in the electrolyte.

[0062] The drainage groove 533 is located on the support boss 532 and is lower than the side surface of the support boss 532 facing the seal 54 in the axial direction of the injection chamber 531. The drainage groove 533 can guide the electrolyte falling on the support boss 532 toward the connection position away from the cavity peripheral wall 5312 and the seal 54.

[0063] In the technical solution of this application embodiment, by providing multiple drainage grooves 533 on the support boss 532 and extending the drainage grooves 533 in a direction away from the connection part 541, on the basis that the support boss 532 can stably support the seal 54, the drainage grooves 533 can be used to guide the electrolyte falling on the support boss 532 toward the connection position away from the cavity peripheral wall 5312 and the seal 54, thereby reducing the electrolyte residue on the support boss 532, thereby improving the connection reliability between the seal 54 and the terminal post 53, thereby reducing electrolyte leakage and extending the service life of the battery cell 50.

[0064] Furthermore, when the seal 54 is welded to the electrode post 53, the drainage groove 533 can guide the electrolyte falling on the support boss 532 toward the welding position away from the electrode post 53, reducing the occurrence of welding defects such as pinhole bursts caused by the thermal effect of the electrolyte, which helps to reduce the number of hidden pores in the connection 541 formed by the welding of the seal 54 and the electrode post 53, thereby improving the welding reliability of the seal 54 and the electrode post 53.

[0065] Reference Figure 6 and Figure 7In some embodiments, multiple drainage channels 533 are arranged evenly and at intervals around the injection hole 5315. That is, the distance between any two adjacent drainage channels 533 is equal.

[0066] For example, the injection chamber 531 has a circular cross-sectional shape, and multiple drainage grooves 533 are evenly and spaced apart around the circumference of the injection chamber 531. Of course, the cross-sectional shape of the injection chamber 531 can also be rectangular, elliptical, etc.

[0067] In the above technical solution, multiple drainage grooves 533 are evenly and spaced apart around the injection hole 5315, so that multiple first protrusions 5321 forming multiple drainage grooves 533 are evenly and spaced apart around the injection hole 5315. In this way, multiple first protrusions 5321 can be used to support the seal 54, improving the installation reliability and stability of the seal 54. Furthermore, the drainage grooves 533 at different positions can be used to guide the electrolyte falling on the corresponding position of the support protrusion 532 to the connection position away from the cavity peripheral wall 5312 and the seal 54, reducing electrolyte residue and improving the connection reliability between the seal 54 and the electrode post 53.

[0068] Reference Figure 6 and Figure 7 In some embodiments, the support boss 532 includes a plurality of first protrusions 5321, which are arranged circumferentially at intervals in the injection hole 5315, and a drainage groove 533 is defined between two adjacent first protrusions 5321.

[0069] The seal 54 is supported on one side of the plurality of first protrusions 5321 facing the cavity 5313.

[0070] In the above technical solution, by setting the support boss 532 to include multiple first protrusions 5321, multiple first protrusions 5321 can define multiple drainage grooves 533. Based on the stable support of the seal 54 by using multiple first protrusions 5321, the electrolyte falling on the corresponding position of the support boss 532 can be guided away from the connection position of the cavity peripheral wall 5312 and the seal 54 by the drainage grooves 533 at different positions, thereby improving the connection reliability between the seal 54 and the electrode post 53.

[0071] In some embodiments, a plurality of first protrusions 5321 are arranged evenly and at intervals around the injection hole 5315.

[0072] In the above technical solution, multiple first protrusions 5321 are evenly and spaced apart around the injection hole 5315, so that multiple drainage grooves 533 are evenly and spaced apart around the injection hole 5315. In this way, multiple first protrusions 5321 can be used to support the seal 54, improving the installation reliability and stability of the seal 54. Furthermore, the drainage grooves 533 at different positions can be used to guide the electrolyte falling on the corresponding position of the support protrusion 532 to the connection position away from the cavity peripheral wall 5312 and the seal 54, thereby improving the connection reliability between the seal 54 and the electrode post 53.

[0073] In some embodiments, the number of first protrusions 5321 is greater than or equal to four. For example, the number of first protrusions 5321 can be 4, 6, 8, 10, 12, etc.

[0074] In the above technical solution, by limiting the number of first protrusions 5321 to be greater than or equal to 4, the surface area of ​​the side surface of the support boss 532 facing the seal 54 can be increased, thereby increasing the contact area between the support boss 532 and the seal 54, which in turn improves the support effect of the support boss 532 on the seal 54 and greatly improves the installation reliability and stability of the seal 54 on the support boss 532.

[0075] In some embodiments, the inner surface of the cavity peripheral wall 5312 includes a first surface 53121, which is an annular surface extending circumferentially along the cavity bottom wall 5311. The first surface 53121 extends obliquely from the outside to the inside toward the cavity bottom wall 5311 in the radial direction of the injection hole 5315. A plurality of first protrusions 5321 protrude from the first surface 53121.

[0076] In other words, a portion of the first surface 53121 forms a groove wall surface of the drainage groove 533.

[0077] With this configuration, the first surface 53121 can guide the electrolyte falling on the support boss 532 away from the connection position between the cavity peripheral wall 5312 and the seal 54, reducing electrolyte residue on the support boss 532, thereby improving the connection reliability between the seal 54 and the electrode post 53.

[0078] Reference Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the structure of the terminal post 53 of the battery cell 50 in some other embodiments of this application; Figure 9 for Figure 8The enlarged view of part B shown. In some embodiments, the support boss 532 further includes a second protrusion 5322, which protrudes from the inner surface of the cavity peripheral wall 5312 and is an annular boss extending circumferentially along the cavity bottom wall 5311. The side surface of the second protrusion 5322 facing the central axis of the injection cavity 531 is the second surface 53221, and a plurality of first protrusions 5321 protrude from the second surface 53221.

[0079] Specifically, the support boss 532 includes a plurality of first protrusions 5321 and second protrusions 5322. The second protrusions 5322 are disposed on the cavity peripheral wall 5312 and are annular protrusions extending circumferentially along the cavity bottom wall 5311. The side surface of the second protrusion 5322 facing the central axis of the injection cavity 531 is the second surface 53221, that is, the side surface of the second protrusion 5322 away from the cavity peripheral wall 5312 is the second surface 53221. The plurality of first protrusions 5321 are disposed on the second surface 53221. A drainage groove 533 is defined between two adjacent first protrusions 5321 and second protrusions 5322. A portion of the second surface 53221 forms a groove wall surface of the drainage groove 533.

[0080] The sealing element 54 is supported on one side of the first protrusion 5321 facing the cavity 5313 and on the other side of the second protrusion 5322 facing the cavity 5313.

[0081] In the above technical solution, by setting the support boss 532 to include multiple first protrusions 5321 and second protrusions 5322, the multiple first protrusions 5321 and second protrusions 5322 can support the seal 54, increasing the contact area between the support boss 532 and the seal 54, thereby improving the installation reliability and stability of the seal 54; in addition, the multiple first protrusions 5321 and second protrusions 5322 can define multiple drainage grooves 533, thereby guiding the electrolyte falling on the support boss 532 toward the connection position away from the cavity peripheral wall 5312 and the seal 54, improving the connection reliability between the seal 54 and the electrode post 53.

[0082] In some embodiments, the second surface 53221 extends obliquely from the outside to the inside toward the bottom wall 5311 of the cavity in the radial direction of the injection hole 5315.

[0083] With this configuration, the second surface 53221 can guide the electrolyte falling on the support boss 532 away from the connection position between the cavity peripheral wall 5312 and the seal 54, reducing electrolyte residue on the support boss 532, thereby improving the connection reliability between the seal 54 and the electrode 53 and reducing electrolyte leakage.

[0084] In some embodiments, the space between the seal 54 and the bottom wall 5311 communicates the injection hole 5315 and the drainage groove 533.

[0085] Specifically, during the injection process, the electrolyte falling on the support platform can flow toward the drainage groove 533. Under the drainage effect of the drainage groove 533, the electrolyte can flow to the space between the seal 54 and the bottom wall 5311 of the cavity, and can even flow into the housing 51 through the injection hole 5315.

[0086] In the above technical solution, by defining the space between the seal 54 and the cavity bottom wall 5311 to connect the injection hole 5315 and the drainage groove 533, the drainage groove 533 can guide the electrolyte falling on the support boss 532 in a direction away from the connection position between the cavity peripheral wall 5312 and the seal 54, and finally guide it to the space between the seal 54 and the cavity bottom wall 5311, reducing the electrolyte residue on the support boss 532, thereby improving the connection reliability between the seal 54 and the electrode post 53.

[0087] Reference Figure 10 , Figure 10 for Figure 8 The diagram shows a projection of the support boss 532 along the axial direction of the injection cavity 531. The axial direction of the injection cavity 531 is as follows: Figure 5 The Z direction is shown. In some embodiments, the area of ​​the side surface of the support boss 532 facing the seal 54 is S1, and the area of ​​the annular region containing the side surface of the support boss 532 facing the seal 54 is S2. The ratio of S1 to S2 is greater than or equal to 0.5 and less than 1. For example, the ratio of S1 to S2 can be 0.5, 0.7, 0.8, etc.

[0088] For example, the cross-sectional shape of the injection cavity 531 is circular, and the area S1 of the side surface of the supporting boss 532 facing the seal 54 is equal to the sum of the area of ​​the side surface of the second protrusion 5322 facing the seal 54 and the area of ​​the side surface of the plurality of first protrusions 5321 facing the seal 54. The annular region where the side surface of the supporting boss 532 facing the seal 54 is located is an annular region, and the area of ​​the annular region is S2.

[0089] Of course, the cross-sectional shape of the injection cavity 531 can also be square, rectangular, elliptical, etc.

[0090] In the above technical solution, by limiting the ratio of S1 to S2 to be greater than or equal to 0.5, the electrolyte on the support boss 532 flows into the drainage groove 533 in a direction away from the connection position between the cavity peripheral wall 5312 and the seal 54. This increases the surface area of ​​the side of the support boss 532 facing the seal 54, thereby increasing the contact area between the support boss 532 and the seal 54. This improves the support effect of the support boss 532 on the seal 54 and significantly enhances the installation reliability and stability of the seal 54 on the support boss 532.

[0091] Reference Figure 6 and Figure 8 In some embodiments, the projection shape of the drainage groove 533 along the axial direction of the injection chamber 531 is rectangular or trapezoidal.

[0092] Reference Figure 11 and Figure 12 , Figure 11 This is a schematic diagram of the structure of the terminal 53 of the battery cell 50 in some embodiments of this application; Figure 12 for Figure 11 An enlarged view of section C shown. In some embodiments, the projection shape of the drainage groove 533 along the axial direction of the injection chamber 531 is triangular.

[0093] In some embodiments, the projection shape of the drainage groove 533 along the axial direction of the injection chamber 531 is semi-circular.

[0094] In this embodiment, the projection shape of the drainage groove 533 along the axial direction of the injection chamber 531 can be selected as needed.

[0095] Reference Figure 11 and Figure 12 In some embodiments, the drainage channel 533 includes a first channel sidewall 5331 and a second channel sidewall 5332, which are arranged opposite to each other in the circumferential direction of the injection chamber 531.

[0096] The first groove sidewall 5331 and the second groove sidewall 5332 can be parallel to the axial direction of the injection chamber 531, or they can be inclined relative to the axial direction of the injection chamber 531. The specific choice can be made according to the needs.

[0097] Reference Figure 6 and Figure 7 and further refer to Figure 13 and Figure 14 , Figure 13 for Figure 6 A top view of the pole post 53 shown; Figure 14 for Figure 13The diagram shows a cross-sectional view of the pole 53. In some embodiments, the drainage channel 533 further includes a third channel sidewall 5333, which is connected in the circumferential direction between the first channel sidewall 5331 and the second channel sidewall 5332 in the injection cavity 531. The third channel sidewall 5333 extends obliquely from the outside to the inside toward the bottom wall 5311 of the cavity in the radial direction of the injection hole 5315.

[0098] In the above technical solution, by setting the third groove sidewall 5333 to extend obliquely from the outside to the inside towards the bottom wall 5311 of the cavity in the radial direction of the injection hole 5315, the electrolyte falling on the support boss 532 can be guided away from the connection position between the cavity peripheral wall 5312 and the seal 54 by the third groove sidewall 5333, reducing the electrolyte residue on the support boss 532, thereby improving the connection reliability between the seal 54 and the electrode 53, and thus reducing electrolyte leakage.

[0099] Reference Figure 11 and Figure 12 In some embodiments, the first groove sidewall 5331 extends obliquely in the circumferential direction of the injection cavity 531, in a direction close to the second groove sidewall 5332, toward the bottom wall 5311 of the cavity.

[0100] In the above technical solution, by setting the first groove sidewall 5331 to extend obliquely in the circumferential direction of the injection cavity 531, along the direction close to the second groove sidewall 5332 and towards the bottom wall 5311 of the cavity, the first groove sidewall 5331 can guide the electrolyte falling on the support boss 532 away from the connection position between the cavity peripheral wall 5312 and the seal 54, reducing the electrolyte residue on the support boss 532, thereby improving the connection reliability between the seal 54 and the electrode 53, and thus reducing electrolyte leakage.

[0101] In some embodiments, the second groove sidewall 5332 extends obliquely toward the bottom wall 531 of the cavity in the circumferential direction of the injection cavity 531, in a direction close to the first groove sidewall 5331.

[0102] In the above technical solution, by setting the second groove sidewall 5332 to extend obliquely in the circumferential direction of the injection cavity 531, along the direction close to the first groove sidewall 5331 and towards the bottom wall 5311 of the cavity, the second groove sidewall 5332 can guide the electrolyte falling on the support boss 532 toward the direction away from the connection position between the cavity peripheral wall 5312 and the seal 54, reducing the electrolyte residue on the support boss 532, thereby improving the connection reliability between the seal 54 and the electrode 53, and thus reducing electrolyte leakage.

[0103] In some embodiments, the first groove sidewall 5331 extends obliquely in the circumferential direction of the injection cavity 531, in a direction close to the second groove sidewall 5332, toward the cavity bottom wall 5311. The second groove sidewall 5332 extends obliquely in the circumferential direction of the injection cavity 531, in a direction close to the first groove sidewall 5331, toward the cavity bottom wall 5311.

[0104] In the above technical solution, by setting the first groove sidewall 5331 to extend obliquely in the circumferential direction of the injection cavity 531, along the direction close to the second groove sidewall 5332 and towards the direction close to the cavity bottom wall 5311, and setting the second groove sidewall 5332 to extend obliquely in the circumferential direction of the injection cavity 531, along the direction close to the first groove sidewall 5331 and towards the cavity bottom wall 5311, the electrolyte falling on the support boss 532 can be guided away from the connection position between the cavity peripheral wall 5312 and the seal 54 by the first groove sidewall 5331 and the second groove sidewall 5332, reducing the electrolyte residue on the support boss 532, thereby improving the connection reliability between the seal 54 and the electrode 53, and thus reducing electrolyte leakage.

[0105] Reference Figure 15 , Figure 15 This is a cross-sectional view of the terminal post 53 of the battery cell 50 in some embodiments of this application. In some embodiments, the seal 54 is provided with a venting channel 542, which penetrates the seal 54 at both ends of the liquid injection chamber 531 in the axial direction. A sealing element is provided at the opening of the venting channel 542 away from the bottom wall 5311 of the chamber.

[0106] During the process of connecting the seal 54 and the cavity wall 5312, such as during the welding process of the seal 54 and the cavity wall 5312, impurities such as electrolyte adhering to the cavity wall 5312 are heated, and the low boiling point and low melting point substances in the impurities will generate gas when heated, and escape from the venting channel 542.

[0107] After welding the sealing element 54 and the cavity peripheral wall 5312, the opening at the end of the venting passage 542 away from the cavity bottom wall 5311 can be sealed by welding, that is, a sealing element is formed by welding; of course, a separate sealing element can also be used to seal the opening at the end of the venting passage 542 away from the cavity bottom wall 5311.

[0108] Therefore, in the above technical solution, by providing a venting channel 542 on the sealing element 54, the gas generated during the welding process can be discharged from the venting channel 542, thereby reducing the porosity in the welded connection 541, which is beneficial to improving the quality of the connection 541, and thus improving the connection reliability between the sealing element 54 and the cavity peripheral wall 5312; by providing a sealing element, the opening at the end of the venting channel 542 away from the cavity bottom wall 5311 can be sealed, reducing electrolyte leakage and extending the service life of the battery cell 50.

[0109] In some embodiments, the two ends of the venting channel 542 are a first opening 5421 and a second opening 5422, respectively, and the projections of the first opening 5421 and the second opening 5422 along the axial direction of the injection chamber 531 do not overlap at least partially.

[0110] This configuration allows electrolyte vapor to escape through the venting channel 542, reducing the likelihood of laser leakage from the venting channel 542 into the housing 51 and minimizing laser damage to the electrode assembly 52.

[0111] Reference Figure 15 In some embodiments, the venting passage 542 is axially inclined relative to the injection chamber 531.

[0112] In the above technical solution, setting the venting channel 542 to be axially inclined relative to the injection chamber 531 can reduce the probability of laser leaking from the venting channel 542 into the housing 51 and reduce laser damage to the electrode assembly 52.

[0113] In some embodiments, the diameter of the venting channel 542 is 0.1~1mm, and the angle between the extending direction of the venting channel 542 and the axial direction of the injection chamber 531 is less than 45°.

[0114] This design reduces the processing difficulty of the venting channel 542 and facilitates sealing the opening at the end of the venting channel 542 that is far from the bottom wall 5311 of the cavity. On the other hand, it allows the gas generated during the welding process to be smoothly discharged from the venting channel 542.

[0115] Reference Figure 16 , Figure 16 This is a cross-sectional view of the terminal post 53 of the battery cell 50 according to other embodiments of this application. In some embodiments, the sealing member 54 has a mounting groove 543 on the side away from the bottom wall 5311 of the cavity, and one end of the venting channel 542 is opened in the bottom wall of the mounting groove 543.

[0116] The size of the mounting groove 543 is larger than the size of the opening at one end of the venting channel 542, and the sealing element is located inside the mounting groove 543.

[0117] In the embodiments of this application, the extending direction of the venting channel 542 can be the axial direction of the injection chamber 531, or it can be inclined relative to the axial direction of the injection chamber 531.

[0118] After welding the sealing element 54 and the cavity peripheral wall 5312, a separate sealing element can be used to seal the opening at the end of the venting passage 542 away from the cavity bottom wall 5311. This sealing element can be connected to the groove wall of the mounting groove 543 by welding, bonding, or other methods. Alternatively, the sealing element can be interference-fitted with the mounting groove 543.

[0119] In the above technical solution, by setting the size of the mounting groove 543 to be larger than the opening size at one end of the venting channel 542, the probability of laser leakage from the venting channel 542 into the housing 51 can be reduced during the welding of the sealing component, thereby reducing laser damage to the electrode assembly 52.

[0120] In some embodiments, the diameter of the sealing element is greater than or equal to twice the diameter of the venting channel 542, thereby reducing the probability of laser leakage from the venting channel 542 into the housing 51 during the welding of the sealing element and reducing laser damage to the electrode assembly 52.

[0121] Reference Figure 16 In some embodiments, the pole post 53 includes a body 5341, a first flange 5342 and a second flange 5343. The body 5341 defines an injection cavity 531. The first flange 5342 and the second flange 5343 are both disposed on the outer peripheral wall of the body 5341 and are axially spaced apart from each other in the body 5341. The first shell wall 513 is at least partially sandwiched between the first flange 5342 and the second flange 5343.

[0122] Reference Figure 2 According to some embodiments of this application, this application also provides a battery device 100, including the battery cell 50 described in any of the above embodiments.

[0123] In the technical solution of this application embodiment, by using the above-mentioned battery cell 50, electrolyte leakage can be reduced and the service life of the battery device 100 can be extended.

[0124] Reference Figure 1 According to some embodiments of this application, this application also provides an electrical device, including a battery cell 50 as described in any of the above schemes, or including a battery device 100 as described in the above schemes, and the battery device 100 is used to provide electrical energy to the electrical device.

[0125] The power supply device can be any of the aforementioned devices or systems that utilize battery device 100.

[0126] In the technical solution of this application embodiment, by using the above-mentioned battery cell 50 or battery device 100, electrolyte leakage can be reduced and the service life of the electrical device can be extended.

[0127] According to some embodiments of this application, a battery cell 50 is provided. The battery cell 50 includes a housing 51, an electrode assembly 52, a terminal post 53, and a sealing member 54. The housing 51 includes a first housing wall 513. The electrode assembly 52 is disposed within the housing 51. The terminal post 53 is disposed on the first housing wall 513 and electrically connected to the electrode assembly 52. ​​The terminal post 53 defines a liquid injection cavity 531. The liquid injection cavity 531 has a bottom wall 5311, a peripheral wall 5312, and an opening 5313. The opening 5313 is located on the side of the bottom wall 5311 away from the electrode assembly 52. ​​The peripheral wall 5312 is disposed on the outer periphery of the bottom wall 5311 and has a support boss 532. The sealing member 54 is supported on the support boss 532 and welded to the peripheral wall 5312 to form a connection portion 541. The connection portion 541 is located on the side of the support boss 532 away from the bottom wall 5311.

[0128] The cavity bottom wall 5311 is provided with an injection hole 5315, and the support boss 532 has a plurality of drainage grooves 533. The plurality of drainage grooves 533 are arranged circumferentially at intervals in the injection hole 5315. The drainage grooves 533 extend from the side surface of the support boss 532 toward the seal 54 in a direction away from the connection part 541.

[0129] In some embodiments, the support boss 532 includes a plurality of first protrusions 5321, which are arranged circumferentially at intervals in the injection hole 5315, and a drainage groove 533 is defined between two adjacent first protrusions 5321. The seal 54 is supported on the side of the plurality of first protrusions 5321 facing the cavity 5313.

[0130] In some embodiments, the drainage channel 533 includes a first channel sidewall 5331, a second channel sidewall 5332, and a third channel sidewall 5333. The first channel sidewall 5331 and the second channel sidewall 5332 are disposed opposite each other in the circumferential direction of the injection cavity 531. The third channel sidewall 5333 is connected between the first channel sidewall 5331 and the second channel sidewall 5332 in the circumferential direction of the injection cavity 531. The third channel sidewall 5333 extends obliquely from the outside to the inside toward the bottom wall 5311 of the cavity in the radial direction of the injection hole 5315.

[0131] In the technical solution of this application embodiment, by setting multiple drainage grooves 533 on the support boss 532 and extending the drainage grooves 533 in a direction away from the connection part 541, on the basis that the support boss 532 can stably support the seal 54, the third groove sidewall 5333 of the drainage groove 533 can guide the electrolyte falling on the support boss 532 toward the welding position away from the electrode post 53, thereby reducing the generation of welding defects such as pinhole bursts caused by the thermal effect of the electrolyte, which helps to reduce the number of hidden pores in the connection part 541 formed by welding the seal 54 and the electrode post 53, thereby improving the welding reliability of the seal 54 and the electrode post 53.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The shell, including the first shell wall; Electrode assembly, disposed within the housing; An electrode post is disposed on the first shell wall and electrically connected to the electrode assembly. The electrode post defines an injection cavity. The injection cavity has a bottom wall, a peripheral wall, and an opening. The opening is located on the side of the bottom wall away from the electrode assembly. The peripheral wall is disposed on the outer periphery of the bottom wall and is provided with a support boss. A sealing element, supported by the supporting boss, and connected to the cavity peripheral wall to form a connecting portion; The cavity bottom wall is provided with an injection hole, and the support boss has multiple drainage grooves. The multiple drainage grooves are arranged circumferentially at intervals in the injection hole, and the drainage grooves extend from the side surface of the support boss toward the seal in a direction away from the connection part.

2. The battery cell according to claim 1, characterized in that, The plurality of drainage channels are arranged evenly and at intervals around the injection hole.

3. The battery cell according to claim 1, characterized in that, The supporting boss includes: A plurality of first protrusions are arranged circumferentially at intervals in the injection hole, and the drainage groove is defined between two adjacent first protrusions. The seal is supported on one side of the plurality of first protrusions facing the cavity opening.

4. The battery cell according to claim 3, characterized in that, The plurality of the first protrusions are arranged evenly and at intervals around the injection hole.

5. The battery cell according to claim 3, characterized in that, The number of the first protrusion is greater than or equal to 4.

6. The battery cell according to claim 3, characterized in that, The inner surface of the cavity peripheral wall includes a first surface, which is an annular surface extending circumferentially along the bottom wall of the cavity, and the first surface extends obliquely from the outside to the inside toward the bottom wall of the cavity in the radial direction of the injection hole, and a plurality of first protrusions protrude from the first surface.

7. The battery cell according to claim 3, characterized in that, The supporting boss also includes: The second protrusion is provided on the inner surface of the cavity peripheral wall and is an annular protrusion extending circumferentially along the bottom wall of the cavity. The side surface of the second protrusion facing the central axis of the injection cavity is the second surface, and a plurality of the first protrusions are provided on the second surface. The seal is supported on one side of the first protrusion facing the cavity opening and on the other side of the second protrusion facing the cavity opening.

8. The battery cell according to claim 7, characterized in that, The second surface extends radially from the outside to the inside toward the bottom wall of the cavity in the direction of the injection hole.

9. The battery cell according to claim 1, characterized in that, The space between the seal and the bottom wall of the cavity connects the injection hole and the drainage groove.

10. The battery cell according to claim 1, characterized in that, The area of ​​the side surface of the support boss facing the seal is S1, and the area of ​​the annular region containing the side surface of the support boss facing the seal is S2. The ratio of S1 to S2 is greater than or equal to 0.5 and less than 1.

11. The battery cell according to claim 1, characterized in that, The projection shape of the drainage groove along the axial direction of the injection cavity is rectangular, trapezoidal, triangular, or semi-circular.

12. The battery cell according to claim 1, characterized in that, The drainage channel includes: The first and second sidewalls of the injection chamber are arranged opposite each other in the circumferential direction.

13. The battery cell according to claim 12, characterized in that, The drainage channel also includes: The third groove sidewall is connected between the first groove sidewall and the second groove sidewall in the circumferential direction of the injection cavity. The third groove sidewall extends obliquely from the outside to the inside towards the bottom wall of the cavity in the radial direction of the injection hole.

14. The battery cell according to claim 12, characterized in that, The first groove sidewall extends obliquely towards the bottom wall of the cavity in the circumferential direction of the injection cavity, along the direction close to the second groove sidewall; and / or, the second groove sidewall extends obliquely towards the bottom wall of the cavity in the circumferential direction of the injection cavity, along the direction close to the first groove sidewall.

15. The battery cell according to any one of claims 1-14, characterized in that, The sealing element is provided with a venting channel, which passes through both ends of the sealing element in the axial direction of the injection chamber. A sealing element is provided at the opening of the venting channel away from the bottom wall of the chamber.

16. The battery cell according to claim 15, characterized in that, The two ends of the venting channel are a first opening and a second opening, respectively, and the projections of the first opening and the second opening along the axial direction of the injection cavity do not overlap at least partially.

17. The battery cell according to claim 15, characterized in that, The venting channel is inclined relative to the axial direction of the injection chamber.

18. The battery cell according to claim 15, characterized in that, The sealing element has a mounting groove on the side away from the bottom wall of the cavity, and one end of the venting channel has an opening in the bottom wall of the mounting groove; The size of the mounting groove is larger than the size of the opening at one end of the venting channel, and the sealing element is disposed in the mounting groove.

19. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-18.

20. An electrical appliance, characterized in that, It includes a battery cell according to any one of claims 1-18; or, it includes a battery device according to claim 19.

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