Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell comprising a first shell wall; a pole assembly arranged on the first shell wall and comprising a pole piece, an adapter and a sealing ring, the adapter surrounds the pole piece and is connected with the first shell wall, and the sealing ring comprises a first sealing part, the first sealing part is arranged between the pole piece and the adapter in the thickness direction of the first shell wall; and an electrode assembly accommodated in the shell and connected with the pole piece in a conductive mode. At least one of the pole piece and the adapter has a positioning protrusion on the side of the first sealing part, the first sealing part has a positioning groove matched with the positioning protrusion, the width of the positioning groove in the radial direction is W1, the width of the positioning protrusion in the radial direction is W2, and W1 is greater than or equal to W2. In the technical scheme of the application, the sealing effect and the assembly efficiency between the pole piece and the adapter can be improved, and the working reliability and the assembly efficiency of the battery monomer are improved.

Description

Technical Field

[0001] This application relates to the field of battery devices, and in particular to a battery cell, a battery device, and an 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 the battery cell of the relevant technology, the terminal is connected to the battery casing through an adapter ring. A sealing ring is provided between the terminal and the adapter ring. During the process of the terminal and the adapter ring assembling, the sealing ring may slip when it is compressed, resulting in poor sealing between the terminal and the adapter ring, and also affecting the assembly efficiency between the terminal and the connecting ring. Utility Model Content

[0004] In view of the above problems, this application proposes a battery cell, a battery device, and an electrical device. A first aspect of this application is to provide a battery cell that improves the sealing effect and assembly efficiency between the terminal post and the adapter, thereby improving the operational reliability and assembly efficiency of the battery cell.

[0005] The second aspect of this application is to provide a battery device having the aforementioned battery cells.

[0006] The third aspect of this application is to provide an electrical device having the aforementioned battery device.

[0007] In a first aspect, this application provides a battery cell, comprising: a housing, including a first housing wall; an electrode assembly disposed on the first housing wall, and including an electrode member, an adapter member, and a sealing ring, the adapter member surrounding the electrode member and connected to the first housing wall, the sealing ring including a first sealing portion, the first sealing portion being sandwiched between the electrode member and the adapter member in the thickness direction of the first housing wall; an electrode assembly housed within the housing, and including an active material coating portion and a conductive portion connected to the active material coating portion, the conductive portion being connected to the electrode member; wherein at least one of the electrode member and the adapter member has a positioning protrusion on the side facing the first sealing portion, the first sealing portion having a positioning groove cooperating with the positioning protrusion, the positioning groove having a radial width of W1, the positioning protrusion having a radial width of W2, and W1 being greater than or equal to W2.

[0008] In the technical solution of this application embodiment, by designing a positioning protrusion on at least one of the terminal post and the adapter, and designing a positioning groove on the first sealing part of the sealing ring, the positioning protrusion and the positioning groove are inserted and engaged during the assembly of the terminal post and the adapter. On the one hand, the first sealing part can be limited to prevent it from moving due to compression during the assembly of the terminal post and the adapter. On the other hand, the contact area between the first sealing part and the structure with the positioning protrusion can be increased, thereby improving the sealing effect between the terminal post and the adapter, and thus improving the working reliability of the battery cell. Furthermore, by limiting the size of the positioning protrusion and the positioning groove, the assembly efficiency of the first sealing part and the structure with the positioning protrusion can be improved, thereby improving the assembly efficiency of the terminal post and the adapter, and thus improving the assembly efficiency of the battery cell.

[0009] According to some embodiments of this application, the difference between W1 and W2 is less than or equal to 0.2 mm. When the difference between W1 and W2 meets the above range, the sealing effect between the positioning protrusion and the positioning groove can be ensured while improving the assembly efficiency of the positioning protrusion and the positioning groove.

[0010] According to some embodiments of this application, the radial dimension of the first sealing portion is W, and the difference between W and W1 is greater than or equal to 0.8 mm. When the difference between W and W1 meets the above range, the sealing effect of the first sealing portion on the gap between the pole piece and the adapter can be ensured while ensuring that the first sealing portion can be inserted and fitted with the structure with the positioning protrusion.

[0011] According to some embodiments of this application, the adapter has a through hole, and the electrode post includes: an outer extension located on the side of the adapter away from the electrode assembly; an inner extension located on the side of the adapter close to the electrode assembly; and a main body portion passing through the through hole and connected between the outer extension portion and the inner extension portion. A first sealing portion is sandwiched between the inner extension portion and the side of the adapter facing the electrode assembly. In this case, the sealing ring is positioned at the mating location of the adapter and the stepped structure of the electrode post. The sealing ring can seal from the side of the main body facing the electrode assembly to the side away from the electrode assembly, which facilitates sealing the mating location of the adapter and the electrode post with a shorter path. Furthermore, it helps to reduce the size of the sealing ring, making it easier to achieve compression sealing, reducing the likelihood of seal failure, and improving the sealing effect.

[0012] According to some embodiments of this application, the dimension of the positioning protrusion in the thickness direction of the first shell wall is H1, and the distance between the side of the adapter near the electrode assembly and the inner extension in the thickness direction of the first shell wall is H2. H1 and H2 satisfy the condition: 0.5 ≤ H1 / H2 ≤ 0.7. When the ratio of H1 to H2 meets the above range, sufficient compression of the first sealing part can be ensured while avoiding overpressure on the first sealing part, further improving the sealing effect of the first sealing part on the gap between the side of the adapter near the electrode assembly and the inner extension in the thickness direction of the first shell wall.

[0013] According to some embodiments of this application, the sealing ring further includes a second sealing portion, which is angled and connected to the first sealing portion, and the second sealing portion is at least partially located between the hole wall of the perforation and the main body. Different portions of the sealing ring respectively seal the gaps between different surfaces of the transition piece and the electrode post stepped structure, thereby improving the sealing effect of the sealing ring on the gaps in different directions between the transition piece and the electrode post.

[0014] According to some embodiments of this application, the positioning protrusion is located on the side of the adapter facing the inner extension and defines a portion of the through hole. A first sealing portion is sandwiched between the surface of the positioning protrusion facing the inner extension and the surface of the inner extension facing the positioning protrusion, and a second sealing portion is sandwiched between the inner peripheral wall of the positioning protrusion and the outer peripheral surface of the main body. The positioning protrusion is located on the inner peripheral edge of the adapter, which facilitates the sealing fit between the positioning protrusion and different parts of the sealing ring, thereby improving the sealing effect of the sealing ring on the gaps in different directions between the adapter and the pole piece.

[0015] According to some embodiments of this application, the positioning groove is located near the second sealing portion of the first sealing portion, and the side of the first sealing portion facing the adapter and the side of the second sealing portion facing the adapter together define the positioning groove. This increases the contact area between the positioning groove and the positioning protrusion, thereby improving the sealing effect at the positioning groove.

[0016] According to some embodiments of this application, the positioning groove is located in the radial middle of the first sealing portion. This allows the portion of the first sealing portion without the positioning groove and the second sealing portion to deform under the compression of the pole member and the adapter to seal the gap between the pole member and the adapter, thereby ensuring that the adapter can limit the sealing ring without affecting its sealing effect.

[0017] According to some embodiments of this application, the electrode assembly further includes: a first insulating member, at least partially disposed on the side of the outer extension and the adapter away from the electrode assembly, and in contact with the second sealing portion. This can improve the insulation effect of the sealing ring and the first insulating member on the electrode and the adapter, more effectively isolate the electrode and the adapter, achieve insulation sealing between the electrode and the adapter, and thus achieve insulation between the electrode and the housing.

[0018] According to some embodiments of this application, the sealing ring further includes a third sealing portion, which is angled and connected to the first sealing portion, and at least partially surrounds the outer periphery of the inner extension. The first sealing portion is sandwiched between the inner extension and the adapter to seal the gap between the inner extension and the adapter; the third sealing portion, at least partially surrounding the outer periphery of the inner extension, can seal the gap between the inner extension and other structural components around the outer periphery of the inner extension. Different portions of the sealing ring respectively seal the gaps between the pole piece and other structures to improve the sealing effect of the sealing ring between the pole piece and other structures.

[0019] According to some embodiments of this application, the positioning protrusion is located on the side of the inner extension facing the adapter. This can seal the gap between the pole piece and the adapter.

[0020] According to some embodiments of this application, the positioning groove is located near the third sealing portion of the first sealing portion, and the side of the first sealing portion facing the inner extension and the side of the third sealing portion facing the inner extension together define the positioning groove. The surface of the first sealing portion adjacent to the third sealing portion abuts against the surface of the positioning protrusion facing the adapter, and the surface of the third sealing portion adjacent to the first sealing portion abuts against the outer peripheral wall of the positioning protrusion, which facilitates the sealing fit between the positioning protrusion and different parts of the sealing ring, thereby improving the sealing effect of the sealing ring on the gaps in different directions between the adapter and the pole piece.

[0021] According to some embodiments of this application, the positioning groove is located in the radial middle of the first sealing portion. This allows the portion of the first sealing portion without the positioning groove and the second sealing portion to deform under the compression of the pole member and the adapter to seal the gap between the pole member and the adapter, thereby ensuring that the adapter can limit the sealing ring without affecting its sealing effect.

[0022] According to some embodiments of this application, the electrode assembly further includes a first insulating member. At least a portion of the first insulating member is disposed on the side of the outer extension and the adapter away from the electrode assembly, and at least another portion is disposed on the main body and the wall of the through hole, and contacts the first sealing portion. Different portions of the first insulating member contact different portions of the main body and the adapter, thereby improving the insulation effect of the first insulating member on different portions between the adapter and the electrode assembly. Furthermore, designing the first insulating member so that at least a portion can contact the first sealing portion can improve the insulation effect of the sealing ring and the first insulating member on the electrode assembly and the adapter, more effectively isolating the electrode assembly and the adapter, achieving insulation sealing between the electrode assembly and the adapter, and thus achieving insulation between the electrode assembly and the housing.

[0023] According to some embodiments of this application, the electrode assembly further includes: a second insulating member disposed on the side of the adapter facing the electrode assembly, and comprising: an insulating body surrounding the outer periphery of the body portion; and a first insulating protrusion connected to the insulating body on the side away from the adapter portion and surrounding the outer periphery of the inner extension portion. By providing the second insulating member, insulation can be achieved both between the active material coating portion of the electrode assembly and the inner extension portion, and between the active material coating portion of the electrode assembly and the adapter portion, which is beneficial to improving the reliability of the battery cell.

[0024] According to some embodiments of this application, the sealing ring further includes a second sealing portion, which is angled and connected to the first sealing portion, and the second sealing portion is at least partially located between the hole wall of the perforation and the main body portion; the second insulating member further includes a second insulating protrusion connected to the radially inner side of the insulating body, the second insulating protrusion extending at least partially between the side of the adapter facing the electrode assembly and the inner extension portion, and adjacent to the first sealing portion. This can improve the insulation effect of the sealing ring and the second insulating member between the electrode assembly and the inner extension portion, and between the electrode assembly and the adapter portion, and can more effectively isolate the electrode assembly from the electrode post and the adapter portion, achieving insulation sealing between the electrode assembly and the electrode post and the adapter portion, thereby achieving insulation between the electrode post and the housing.

[0025] According to some embodiments of this application, the sealing ring further includes a third sealing portion, which is angled and connected to the first sealing portion. The third sealing portion at least partially surrounds the outer periphery of the inner extension. A portion of the third sealing portion is located between the first sealing portion and the insulating body, and another portion is located between the outer periphery of the inner extension and the first insulating protrusion. The first sealing portion is sandwiched between the inner extension and the adapter to seal the gap between the inner extension and the adapter. The third sealing portion, at least partially surrounding the outer periphery of the inner extension and located between the inner extension and the first insulating protrusion, can seal the gap between the inner extension and the first insulating protrusion, further improving the sealing effect of the sealing ring and thus improving the reliability of the battery cell.

[0026] Secondly, this application also proposes a battery device having the battery cells described in the above embodiments.

[0027] In the technical solution of this application embodiment, by using the above-mentioned battery cell, the sealing performance is better and the working reliability is higher.

[0028] Thirdly, this application also proposes an electrical device having the battery device described in the above embodiments.

[0029] In the technical solution of this application embodiment, by adopting the above-mentioned battery device, the assembly efficiency of the electrical device can be improved, and the performance and operational reliability of the electrical device can also be enhanced.

[0030] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0031] 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:

[0032] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0033] Figure 2 Exploded views of battery devices according to some embodiments of this application;

[0034] Figure 3 This is a schematic diagram of the structure of a battery cell according to some embodiments of this application;

[0035] Figure 4 This is a side sectional view of a battery cell according to the first embodiment of this application;

[0036] Figure 5 for Figure 4 The center circle shows a magnified view of point A;

[0037] Figure 6 This is a side sectional view of a battery cell according to the second embodiment of this application;

[0038] Figure 7 This is a side sectional view of a battery cell according to the third embodiment of this application;

[0039] Figure 8 This is a side sectional view of a battery cell according to the fourth embodiment of this application;

[0040] Figure 9 This is a side sectional view of a battery cell according to the fifth embodiment of this application;

[0041] Figure 10 This is a side cross-sectional view of a battery cell according to the sixth embodiment of this application.

[0042] The reference numerals in the detailed embodiments are as follows:

[0043] 1000, vehicles;

[0044] 100. Battery assembly; 200. Controller; 300. Motor;

[0045] 101. Box body; 1011. First box section; 1012. Second box section;

[0046] 102. Battery cell;

[0047] 1. Shell; 11. Shell body; 12. Shell cap; 13. First shell wall;

[0048] 2. Terminal assembly;

[0049] 21. Pole member; 211. Main body part; 212. Inner extension part; 213. Outer extension part; 214. Second positioning convex part;

[0050] 22. Adapter; 221. First positioning protrusion; 222. Through hole;

[0051] 23. Sealing ring; 231. First sealing part; 2311. Positioning groove; 232. Second sealing part; 233. Third sealing part;

[0052] 24. First insulating component; 25. Second insulating component; 251. Insulating body; 252. First insulating protrusion; 253. Second insulating protrusion; 254. Third insulating protrusion;

[0053] 3. Electrode assembly; 31. Active material coating part; 32. Conductive part;

[0054] 4. Spacing bars. Detailed Implementation

[0055] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0056] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0057] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0059] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0060] 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.

[0061] In battery cells of relevant technologies, an adapter ring is designed to ensure a stable connection between the terminal and the battery casing. The adapter ring, through precise structural design (such as threads, snaps, or welding), firmly fixes the terminal to the casing, preventing loosening or displacement due to vibration or impact. This ensures a stable connection between the terminal and the battery casing. The adapter ring also insulates the casing from the terminal to prevent short circuits between them. Furthermore, a sealing ring is installed between the terminal and the adapter ring to seal any gaps between them.

[0062] However, the applicant has discovered that during the assembly of the pole and the adapter ring, the sealing ring may be compressed, which could lead to slippage and misalignment, resulting in gaps between the pole and the adapter ring. This can cause poor sealing between the pole and the adapter ring and also affect the assembly efficiency between the pole and the connecting ring.

[0063] To improve at least one of the above-mentioned technical problems, this application provides a battery cell 102, whose terminal assembly 2 includes a terminal member 21, an adapter 22 and a sealing ring 23. At least one of the terminal member 21 and the adapter 22 has a positioning protrusion on one side facing the first sealing portion 231 of the sealing ring 23. The first sealing portion 231 has a positioning groove 2311 that cooperates with the positioning protrusion. The positioning groove 2311 has a radial width of W1, and the positioning protrusion has a radial width of W2. W1 is greater than or equal to W2. By designing a positioning protrusion on at least one of the terminal post 21 and the adapter 22, and a positioning groove 2311 on the first sealing portion 231 of the sealing ring 23, the positioning protrusion and the positioning groove 2311 are interlocked during the engagement of the terminal post 21 and the adapter 22. On the one hand, the first sealing portion 231 is limited to prevent it from moving due to compression during the engagement of the terminal post 21 and the adapter 22. On the other hand, the contact area between the first sealing portion 231 and the structure with the positioning protrusion is increased, thereby improving the sealing effect between the terminal post 21 and the adapter 22, and thus improving the working reliability of the battery cell 102. Furthermore, by limiting the size of the positioning protrusion and the positioning groove 2311, the assembly efficiency of the first sealing portion 231 and the structure with the positioning protrusion can be improved, thereby improving the assembly efficiency of the terminal post 21 and the adapter 22, and thus improving the assembly efficiency of the battery cell 102.

[0064] In short, with increasing emphasis on the performance of the battery cell 102, the battery cell 102 of this application embodiment, through the design of the terminal assembly 2, can improve the sealing effect and assembly efficiency between the terminal 21 and the adapter 22, thereby improving the working reliability and assembly efficiency of the battery cell 102.

[0065] The battery cell 102 disclosed in this application can be used in electrical devices that use the battery device 100 as a power source or in various energy storage systems that use the battery device 100 as an energy storage element. 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.

[0066] 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.

[0067] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 according to 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 is used to control 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.

[0068] 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.

[0069] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 according to some embodiments of this application. The battery device 100 includes a housing 101 and battery cells 102, with the battery cells 102 housed within the housing 101. The housing 101 provides space for the battery cells 102, and the housing 101 can have various structures.

[0070] In some embodiments, the housing 101 may include a first housing portion 1011 and a second housing portion 1012, the first housing portion 1011 and the second housing portion 1012 overlapping each other, and the first housing portion 1011 and the second housing portion 1012 together define a receiving space for accommodating the battery cell 102. The second housing portion 1012 may be a hollow structure with one end open, and the first housing portion 1011 may be a plate-like structure, with the first housing portion 1011 covering the open side of the second housing portion 1012, so that the first housing portion 1011 and the second housing portion 1012 together define the receiving space; the first housing portion 1011 and the second housing portion 1012 may also be hollow structures with one side open, with the open side of the first housing portion 1011 covering the open side of the second housing portion 1012. Of course, the housing 101 formed by the first housing portion 1011 and the second housing portion 1012 may be of various shapes, such as a cylinder, a cuboid, etc.

[0071] In the battery device 100, there can be multiple battery cells 102. These multiple battery cells 102 can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 102 are connected in both series and parallel. Multiple battery cells 102 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 102 is housed within the housing 101. Alternatively, the battery device 100 can also be composed of multiple battery cells 102 first connected in series, parallel, or in a mixed manner to form battery device 100 modules, and then these modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 101. 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 102.

[0072] Each battery cell 102 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, a magnesium-ion battery, or a solid-state battery, but is not limited to these. The battery cell 102 can be cylindrical, flat, cuboid, or other shapes.

[0073] Figure 3 This is a schematic diagram of the structure of a battery cell 102 according to some embodiments of this application; Figures 4-7 This is a cross-sectional view of the structure of a battery cell 102 according to some embodiments of this application. The battery cell 102 refers to the smallest unit that makes up the battery device 100.

[0074] like Figures 3-10 As shown, the battery cell 102 includes: a housing 1, a terminal assembly 2, and an electrode assembly 3. The housing 1 includes a first housing wall 13; the terminal assembly 2 is disposed on the first housing wall 13 and includes a terminal member 21, an adapter 22, and a sealing ring 23. The adapter 22 surrounds the terminal member 21 and is connected to the first housing wall 13. The sealing ring 23 includes a first sealing portion 231, which is sandwiched between the terminal member 21 and the adapter 22 in the thickness direction of the first housing wall 13; the electrode assembly 3 houses... The device is located within the housing 1 and includes an active material coating portion 31 and a conductive portion 32 connected to the active material coating portion 31. The conductive portion 32 is connected to the pole member 21. At least one of the pole member 21 and the adapter 22 has a positioning protrusion on the side facing the first sealing portion 231. The first sealing portion 231 has a positioning groove 2311 that mates with the positioning protrusion. The positioning groove 2311 has a radial width of W1, and the positioning protrusion has a radial width of W2. W1 is greater than or equal to W2.

[0075] Specifically, the battery cell 102 includes a housing 1, a terminal assembly 2, an electrode assembly 3, an electrolyte, and other functional components. The housing 1 includes a cover 12 and a body 11.

[0076] The cover 12 refers to a component that covers the opening of the housing 11 to isolate the internal environment of the battery cell 102 from the external environment. The shape of the cover 12 can be adapted to the shape of the housing 11 to fit it. Optionally, the cover 12 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the cover 12 is not easily deformed under pressure or impact, allowing the battery cell 102 to have higher structural strength and improved reliability. Functional components such as the terminal assembly 2 can be provided on the cover 12. The terminal assembly 2 can be used to electrically connect with the electrode assembly 3 for outputting or inputting electrical energy into the battery cell 102. In some embodiments, the cover 12 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 102 reaches a threshold. The material of the cover 12 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 12. The insulating element can be used to isolate the electrical connection components inside the housing 11 from the cover 12 to reduce the risk of short circuit. For example, the insulating element may be made of plastic, rubber, etc.

[0077] The housing 11 is a component used to cooperate with the cover 12 to form the internal environment of the battery cell 102. This internal environment can accommodate the electrode assembly 3, electrolyte, and other components. The housing 11 and cover 12 can be independent components. An opening can be provided on the housing 11, and the cover 12 can be used to close the opening to form the internal environment of the battery cell 102. Alternatively, the cover 12 and housing 11 can be integrated. Specifically, the cover 12 and housing 11 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 11, the cover 12 closes the housing 11. The housing 11 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 11 can be determined according to the specific shape and size of the electrode assembly 3. The material of the housing 11 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0078] Electrode assembly 3 is the component in the battery cell 102 where the electrochemical reaction occurs. The casing 11 may contain one or more electrode assemblies 3. The electrode assembly 3 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is typically provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body 211 of the electrode assembly 3, 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 211 or separately at both ends of the main body 211. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the terminal assembly 2 to form a current loop. In the solid-state battery device 100, the electrolyte may be a solid electrolyte layer located between the positive and negative electrode sheets, and the aforementioned separator may be omitted.

[0079] like Figures 3-7 As shown, the housing 1 includes a first housing wall 13, and the pole post assembly 2 is disposed on the first housing wall 13. The first housing wall 13 is a part of the housing wall of the housing 1, which can serve as the mounting carrier for the pole post assembly 2. The first housing wall 13 can be a part of the housing body 11, or a housing cover 12, or it can include a part of the housing body 11 and a housing cover 12.

[0080] The electrode assembly 2 includes an electrode post 21, an adapter 22, and a sealing ring 23. The adapter 22 surrounds the electrode post 21 and is connected to the first housing wall 13. The sealing ring 23 includes a first sealing portion 231, which is sandwiched between the electrode post 21 and the adapter 22 in the thickness direction of the first housing wall 13. The electrode assembly 2 has a simple structure and is easy to manufacture. The shape and size of the electrode post 21, the adapter 22, and the sealing ring 23 can be designed separately based on different factors to flexibly adapt to the connection requirements of different types of housings 1 and electrode assemblies 3, thereby increasing the applicability of the electrode assembly 2. Furthermore, the electrode assembly 2 can be used in the anode portion of the battery cell 102 or in the cathode portion.

[0081] The electrode post 21 can be manufactured using stamping or extrusion processes, which are mature, inexpensive, and beneficial for improving the structural strength of the electrode post 21. For example, when the electrode post assembly 2 is the negative electrode, the electrode post 21 can be a copper-aluminum composite, wherein the copper-aluminum composite can include an aluminum portion and a copper portion. The aluminum portion is located on the side of the copper portion facing away from the active material coating 31, making it easy to form a reliable connection with the aluminum busbar component. The copper portion is easy to connect with the copper foil tab of the negative electrode. When the electrode post assembly 2 is the positive electrode, the electrode post 21 can be an aluminum component, which easily forms a reliable connection with the aluminum busbar component and is also easy to connect with the aluminum foil tab of the positive electrode.

[0082] The pole piece 21 can be mounted on the first housing wall 13 via the adapter 22, which facilitates the installation of the pole piece 21. The adapter 22 and the first housing wall 13, or the adapter 22 and the pole piece 21, can be connected by a structurally compatible joint, or by laser welding, riveting, adhesive bonding, or other connection methods not mentioned here, which are not limited here.

[0083] The sealing ring 23 is fitted between the adapter 22 and the terminal post 21. By providing the sealing ring 23, the insulation and sealing effect between the terminal post 21 and the adapter 22 can be better improved, thereby improving the reliability of the battery cell 102. Furthermore, the sealing ring 23 may include at least a first sealing part 231, which is sandwiched between the terminal post 21 and the adapter 22 in the thickness direction of the first shell wall 13 to seal the gap between the terminal post 21 and the adapter 22. The sealing ring 23 may also include other sealing structures to achieve sealing of other parts.

[0084] The electrode assembly 3 is housed within the housing 1. The electrode assembly 3 includes an active material coating portion 31 and a conductive portion 32, with the conductive portion 32 connected to the active material coating portion 31. The conductive portion 32 connects the active material coating portion 31 and the terminal assembly 2 to output or input electrical energy to the battery cell 102. The conductive portion 32 is connected to the terminal member 21, and the connection method is not limited, including but not limited to ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure welding, brazing, and bonding.

[0085] exist Figures 4-7 In the illustrated embodiment, the electrode assembly 3 has multiple conductive parts 32, which converge and connect to the electrode post 21; Figures 8-10 In the embodiment shown, the electrode assembly 3 has multiple conductive parts 32, which extend in different directions and are connected to the electrode post 21 respectively.

[0086] More specifically, at least one of the pole piece 21 and the adapter 22 has a positioning protrusion on the side facing the first sealing part 231. The first sealing part 231 has a positioning groove 2311 that mates with the positioning protrusion. Here, during the engagement of the pole piece 21 and the adapter 22, the positioning protrusion can engage with the positioning groove 2311 on the first sealing part 231. On the one hand, the first sealing part 231 can be limited. By limiting the position of the first sealing part 231, the first sealing part 231 can be prevented from being positioned between the pole piece 21 and the adapter 22. During the fitting process, the sealing ring 23 moves due to compression, thereby reducing the probability of the sealing ring 23 moving in the gap between the pole piece 21 and the adapter 22. This avoids gaps between the sealing ring 23 and the pole piece 21 and between the sealing ring 23 and the adapter 22 caused by the movement of the sealing ring 23, thus improving the sealing effect between the pole piece 21 and the adapter 22. On the other hand, it can increase the contact area between the first sealing part 231 and the structure with the positioning protrusion, thereby improving the sealing effect of the first sealing part 231 on the gap between the pole piece 21 and the adapter 22.

[0087] In some embodiments, the pole piece 21 may protrude towards the first sealing portion 231 to form a positioning protrusion. The positioning groove 2311 engages with the positioning protrusion to allow the pole piece 21 to engage with the sealing ring 23. This increases the contact area between the sealing ring 23 and the pole piece 21 while limiting the sealing ring 23, thereby improving the sealing effect between the pole piece 21 and the adapter 22. In other embodiments, the adapter 22 may protrude towards the first sealing portion 231 to form a positioning protrusion. The positioning groove 2311 engages with the positioning protrusion to allow the adapter 22 to engage with the sealing ring 23. This increases the contact area between the sealing ring 23 and the adapter 22 while limiting the sealing ring 23, thereby improving the sealing effect between the pole piece 21 and the adapter 22. In other embodiments, the adapter 22 and the pole piece 21 may each have a positioning protrusion protruding on the side facing the first sealing part 231. The positioning groove 2311 engages with the positioning protrusion, allowing the adapter 22 and the pole piece 21 to engage with the sealing ring 23, further improving the sealing effect between the pole piece 21 and the adapter 22. Regardless of whether the positioning protrusion is located on the pole piece 21 or the adapter 22, both the pole piece 21 and the adapter 22 can be formed by injection molding. Injection molding is a mature process with low cost and high structural strength.

[0088] Furthermore, you can refer to Figure 5 ,exist Figure 5 On the cross section shown, the cross-sectional shape of the positioning protrusion can be rectangular to increase the contact area between the positioning protrusion and the positioning groove 2311; the cross-sectional shape of the positioning protrusion can also be a rounded rectangle or a semi-circle, which can reduce stress concentration on the positioning protrusion, extend the service life of the positioning protrusion, and improve the sealing reliability between the positioning protrusion and the positioning groove 2311.

[0089] Please refer to Figure 5 The positioning groove 2311 has a radial width of W1, and the positioning protrusion has a radial width of W2. W1 is greater than or equal to W2, so that the positioning protrusion and the positioning groove 2311 can be inserted and engaged during the process of assembling the pole piece 21 and the adapter 22. This improves the assembly efficiency of the first sealing part 231 and the structure with the positioning protrusion, thereby improving the assembly efficiency of the pole piece 21 and the adapter 22 and the sealing effect between the pole piece 21 and the adapter 22, and further improving the assembly efficiency and operational reliability of the battery cell 102.

[0090] Therefore, in the technical solution of this application embodiment, by designing a positioning protrusion on at least one of the terminal post 21 and the adapter 22, and designing a positioning groove 2311 on the first sealing part 231 of the sealing ring 23, the positioning protrusion and the positioning groove 2311 are inserted and engaged during the engagement of the terminal post 21 and the adapter 22. On the one hand, the first sealing part 231 can be limited to prevent it from moving due to compression during the engagement of the terminal post 21 and the adapter 22. On the other hand, the contact area between the first sealing part 231 and the structure with the positioning protrusion can be increased, thereby improving the sealing effect between the terminal post 21 and the adapter 22, and thus improving the working reliability of the battery cell 102. Furthermore, by limiting the size of the positioning protrusion and the positioning groove 2311, the assembly efficiency of the first sealing part 231 and the structure with the positioning protrusion can be improved, thereby improving the assembly efficiency of the terminal post 21 and the adapter 22, and thus improving the assembly efficiency of the battery cell 102.

[0091] According to some embodiments of this application, such as Figure 5 As shown, the difference between W1 and W2 is less than or equal to 0.2mm, that is, |W1-W2|≤0.2mm. Since W1≥W2, the difference between W1 and W2 is 0mm≤W1-W2≤0.2mm. It is understandable that the difference between W1 and W2 should not be too large, as this would lead to an excessive gap between the positioning protrusion and the positioning groove 2311, affecting the sealing effect. When the difference between W1 and W2 satisfies |W1-W2|≤0.2mm, the assembly efficiency of the positioning protrusion and the positioning groove 2311 can be improved while ensuring the sealing effect between them. For example, the difference between W1 and W2 can be 0mm, 0.05mm, 0.1mm, 0.12mm, 0.17mm, 0.2mm, etc.

[0092] In some embodiments, the difference between W1 and W2 is 0.1 mm. In this case, the assembly efficiency of the positioning protrusion and the positioning groove 2311 is higher, and the sealing effect between the positioning protrusion and the positioning groove 2311 is also better.

[0093] According to some embodiments of this application, such as Figure 5 As shown, the radial dimension of the first sealing part 231 is W, and the difference between W and W1 is greater than or equal to 0.8mm, that is, |W-W1|≥0.8mm. Here, the first sealing part 231 is sandwiched between the pole piece 21 and the adapter 22 to seal the gap between them. Since the positioning groove 2311 is formed on the first sealing part 231, W > W1. To avoid the sealing performance of the first sealing part 231 deteriorating due to the positioning groove 2311, the size of the positioning groove 2311 on the first sealing part 231 should not be too large. To ensure the sealing effect of the first sealing part 231 on the gap between the pole piece 21 and the adapter 22, the difference between W and W1 is designed to be greater than or equal to 0.8mm, that is, W - W1 ≥ 0.8mm. This ensures that the first sealing part 231 can be inserted and fitted with the structure with the positioning protrusion while ensuring the sealing effect of the first sealing part 231 on the gap between the pole piece 21 and the adapter 22. For example, the difference between W and W1 can be 0.8mm, 1mm, 1.1mm, 1.3mm, 1.45mm, etc.

[0094] exist Figure 5 In the embodiment shown, the portion of the first sealing part 231 without the positioning groove 2311 is squeezed by the pole piece 21 and the adapter 22 and has a width of W3. That is, the difference between W and W1 is W3, and W3 ≥ 0.8 mm.

[0095] In some embodiments, the difference between W and W1, i.e. W3, is 1.1 mm. In this case, the first sealing part 231 can be inserted and engaged with the structure having the positioning protrusion, and the sealing effect of the first sealing part 231 on the gap between the pole piece 21 and the adapter 22 is also better.

[0096] According to some embodiments of this application, such as Figure 4 As shown, the adapter 22 has a through hole 222, and the electrode post 21 includes an outer extension 213, an inner extension 212, and a main body 211. The outer extension 213 is located on the side of the adapter 22 away from the electrode assembly 3; the inner extension 212 is located on the side of the adapter 22 closer to the electrode assembly 3; the main body 211 passes through the through hole 222 and connects the outer extension 213 and the inner extension 212, and the first sealing part 231 is sandwiched between the inner extension 212 and the side of the adapter 22 facing the electrode assembly 3. Specifically, the adapter 22 surrounds the electrode post 21 circumferentially along the through hole 222, so that the adapter 22 can connect the electrode post 21 and the first shell wall 13 in the outer peripheral region of the electrode post 21.

[0097] The main body 211, inner extension 212, and outer extension 213 of the electrode post 21 together define a stepped structure. The adapter 22 is located on the stepped surface of the stepped structure. The first sealing part 231 of the sealing ring 23 is located between the adapter 22 and the stepped surface of the stepped structure. At this time, the sealing ring 23 is located at the mating position of the adapter 22 and the stepped structure of the electrode post 21. The sealing ring 23 can seal from the side of the main body 211 facing the electrode assembly 3 to the side away from the electrode assembly 3. This is beneficial for sealing the mating position of the adapter 22 and the electrode post 21 with a shorter path. It is also beneficial for reducing the size of the sealing ring 23, making it easier to compress and seal it, and the seal is less likely to fail, thus improving the sealing effect.

[0098] According to some embodiments of this application, such as Figure 5 As shown, the dimension of the positioning protrusion in the thickness direction of the first shell wall 13 is H1, and the distance between the side of the adapter 22 near the electrode assembly 3 and the inner extension 212 in the thickness direction of the first shell wall 13 is H2. H1 and H2 satisfy: 0.5≤H1 / H2≤0.7. Here, the distance between the side of the adapter 22 near the electrode assembly 3 and the inner extension 212 in the thickness direction of the first shell wall 13 is the gap between the adapter 22 and the electrode post 21 where the first sealing part 231 needs to be provided. The distance of the gap in the thickness direction of the first shell wall 13 is H2. In order to ensure that the first sealing part 231 has sufficient compression to achieve a good sealing effect, the gap should not be too large, and the dimension of the positioning protrusion in the thickness direction of the first shell wall 13 should not be too small. At the same time, in order to avoid applying pressure to the first sealing part 231... Excessive pressure can cause the first sealing part 231 to deform and fail. The gap should not be too small, and the size of the positioning protrusion in the thickness direction of the first shell wall 13 should not be too large. When the ratio of H1 to H2 satisfies: 0.5≤H1 / H2≤0.7, it is possible to ensure that the first sealing part 231 has sufficient compression while avoiding overpressure on the first sealing part 231, thereby further improving the sealing effect of the first sealing part 231 on the gap between the side of the adapter 22 near the electrode assembly 3 and the inner extension 212 in the thickness direction of the first shell wall 13.

[0099] In some embodiments, the ratio of H1 to H2 is 0.5. At this time, the first sealing part 231 has sufficient compression and can avoid overpressure on the first sealing part 231, so that the first sealing part 231 has a better sealing effect on the gap between the side of the adapter 22 near the electrode assembly 3 and the inner extension 212 in the thickness direction of the first shell wall 13.

[0100] According to some embodiments of this application, such as Figure 4 , Figure 8As shown, the sealing ring 23 also includes a second sealing portion 232, which is angled and connected to the first sealing portion 231. The second sealing portion 232 is at least partially located between the wall of the through hole 222 and the main body 211. Specifically, the sealing ring 23 is at least formed by connecting the first sealing portion 231 and the second sealing portion 232. The second sealing portion 232 is angled to the first sealing portion 231, so that the sealing ring 23 is bent. At this time, different parts of the sealing ring 23 can cooperate with different structures to achieve a sealing effect. The first sealing portion 231 is sandwiched between the inner extension portion 212 and the adapter 22 to seal the gap between the inner extension portion 212 and the adapter 22; the second sealing portion 232 is sandwiched between the main body 211 and the wall of the through hole 222 of the adapter 22 to seal the gap between the main body 211 and the wall of the through hole 222 of the adapter 22. Different parts of the sealing ring 23 seal the gaps between different surfaces of the stepped structure of the adapter 22 and the pole piece 21, thereby improving the sealing effect of the sealing ring 23 on the gaps between the adapter 22 and the pole piece 21 in different directions.

[0101] According to some embodiments of this application, such as Figures 4-5 As shown, a positioning protrusion is provided on the side of the adapter 22 facing the inward extension 212, and defines a portion of the through hole 222. Specifically, the adapter 22 has a through hole 222, and the positioning protrusion is provided on the side of the adapter 22 facing the inward extension 212 and defines a portion of the through hole 222. Figure 5 The first positioning protrusion 221 is located on the outer periphery of the through hole 222. At this time, the inner peripheral wall of the first positioning protrusion 221 defines a portion of the through hole 222 and is constructed as a portion of the hole wall of the through hole 222. In such a case... Figure 4 , Figure 8 In the embodiment described above, a portion of the first sealing portion 231 is sandwiched between the surface of the positioning protrusion facing the inner extension portion 212 and the surface of the inner extension portion 212 facing the positioning protrusion, and a second sealing portion 232 is sandwiched between the inner peripheral wall of the positioning protrusion and the outer peripheral surface of the main body portion 211. The positioning protrusion is located on the inner peripheral edge of the adapter 22, which facilitates the sealing cooperation between the positioning protrusion and different parts of the sealing ring 23, thereby improving the sealing effect of the sealing ring 23 on the gaps in different directions between the adapter 22 and the pole piece 21.

[0102] According to some embodiments of this application, such as Figure 4 , Figure 8As shown, the positioning groove 2311 is located near the second sealing part 232 of the first sealing part 231, and the side of the first sealing part 231 facing the adapter 22 and the side of the second sealing part 232 facing the adapter 22 together define the positioning groove 2311. At this time, on the side of the first sealing part 231 facing the adapter 22 and the side of the second sealing part 232 facing the adapter 22, the surface of the first sealing part 231 adjacent to the second sealing part 232 abuts against the surface of the positioning protrusion facing the inward extension 212, and the surface of the second sealing part 232 adjacent to the first sealing part 231 abuts against the inner peripheral wall of the positioning protrusion, so as to increase the contact area between the positioning groove 2311 and the positioning protrusion, thereby improving the sealing effect at the positioning groove 2311.

[0103] According to some embodiments of this application, such as Figure 4 , Figure 8 As shown, the positioning groove 2311 is located in the radial center of the first sealing part 231. Figure 4 , Figure 8 In the embodiment, the positioning groove 2311 is located on the surface of the first sealing part 231 facing the adapter 22. In the thickness direction of the sealing ring 23, the positioning groove 2311 is the part with the smallest thickness of the sealing ring 23. The positioning groove 2311 is designed on the surface of the first sealing part 231 facing the adapter 22 and located in the middle of the radial direction of the first sealing part 231, so that the part of the first sealing part 231 without the positioning groove 2311 and the second sealing part 232 can deform under the compression of the pole piece 21 and the adapter 22 to seal the gap between the pole piece 21 and the adapter 22, so as to ensure that the adapter 22 can limit the sealing ring 23 without affecting the sealing effect of the sealing ring 23.

[0104] According to some embodiments of this application, such as Figure 4 , Figure 8 As shown, the electrode assembly 2 also includes a first insulating member 24. At least a portion of the first insulating member 24 is disposed on the side of the outer extension 213 and the adapter 22 away from the electrode assembly 3, and contacts the second sealing portion 232. Specifically, the first insulating member 24 is fitted between the adapter 22 and the outer extension 213 of the electrode assembly 21. By providing the first insulating member 24, the insulation effect between the electrode assembly 21 and the adapter 22 can be better improved, reducing the probability of a short circuit between the electrode assembly 21 and the adapter 22. The first insulating member 24, in conjunction with the sealing ring 23, can insulate and seal the inside and outside of the housing 1 after the adapter 22 is connected to the first housing wall 13, reducing the risk of electrolyte leakage from the housing 1 through the gap between the adapter 22 and the electrode assembly 21 to the outside of the housing 1, and reducing the risk of liquids or dust from outside the housing 1 entering the housing 1 through the gap between the adapter 22 and the electrode assembly 21, thereby improving the reliability of the battery cell 102.

[0105] It is worth mentioning that since the adapter 22 is made of metal, insulation is required between the pole piece 21 and the adapter 22. In some embodiments, the sealing ring 23 has both sealing and insulation effects. The first insulating member 24 is designed to at least partially contact the second sealing part 232, which can improve the insulation effect of the sealing ring 23 and the first insulating member 24 on the pole piece 21 and the adapter 22. This can more effectively isolate the pole piece 21 and the adapter 22, achieving insulation and sealing between the pole piece 21 and the adapter 22, thereby achieving insulation between the pole piece 21 and the housing 1.

[0106] In some embodiments, such as Figure 4 , Figure 8 As shown, the first insulating member 24 and the second sealing portion 232 are at least partially aligned and in contact in the radial direction; in other embodiments, such as Figure 6 , Figure 9 As shown, the end faces of the first insulating member 24 and the second sealing part 232 facing each other are wedge-shaped. The contact between the two wedge-shaped surfaces can increase the contact area between the first insulating member 24 and the second sealing part 232, improve the insulation and sealing effect, and increase the friction between the first insulating member 24 and the second sealing part 232, so as to prevent the first insulating member 24 and the second sealing part 232 from misaligning.

[0107] According to some embodiments of this application, such as Figures 6-7 As shown, the sealing ring 23 also includes a third sealing portion 233, which is angled and connected to the first sealing portion 231. The third sealing portion 233 at least partially surrounds the outer periphery of the inner extension 212. Specifically, the sealing ring 23 is at least formed by connecting the first sealing portion 231 and the third sealing portion 233. The third sealing portion 233 is angled to the first sealing portion 231, causing the sealing ring 23 to bend. At this time, different parts of the sealing ring 23 can cooperate with different structures to achieve a sealing effect. The first sealing portion 231 is sandwiched between the inner extension 212 and the adapter 22 to seal the gap between the inner extension 212 and the adapter 22. At least a portion of the third sealing portion 233 surrounds the outer periphery of the inner extension 212, which can seal the gap between the inner extension 212 and other structural members around the outer periphery of the inner extension 212. Different parts of the sealing ring 23 respectively seal the gaps between the pole piece 21 and other structures, thereby improving the sealing effect of the sealing ring 23 on the pole piece 21 and other structures.

[0108] According to some embodiments of this application, such as Figure 7 , Figure 10 As shown, a positioning protrusion is provided on the side of the inner extension 212 facing the adapter 22. Here, the positioning protrusion is provided in the inner extension 212 and is Figure 7 , Figure 10The second positioning protrusion 214 in the middle has a partial first sealing part 231 sandwiched in the gap between the surface of the positioning protrusion facing the adapter 22 and the surface of the adapter 22 facing the positioning protrusion, so as to seal the gap between the pole member 21 and the adapter 22.

[0109] In such Figure 6 , Figure 9 In the illustrated embodiment, the positioning protrusion is located on the side of the adapter 22 facing the inward extension 212 and is Figure 6 , Figure 9 The first positioning protrusion 221 in .

[0110] According to some embodiments of this application, such as Figure 7 , Figure 10 As shown, the positioning groove 2311 is located near the third sealing part 233 of the first sealing part 231, and the side of the first sealing part 231 facing the inner extension 212 and the side of the third sealing part 233 facing the inner extension 212 together define the positioning groove 2311. At this time, the outer peripheral surface of the positioning protrusion is radially aligned with the inner peripheral surface of the third sealing part 233. On the side of the first sealing part 231 facing the inner extension 212 and the side of the third sealing part 233 facing the inner extension 212, the surface of the first sealing part 231 adjacent to the third sealing part 233 abuts against the surface of the positioning protrusion facing the adapter 22, and the surface of the third sealing part 233 adjacent to the first sealing part 231 abuts against the outer peripheral wall of the positioning protrusion. This facilitates the sealing fit between the positioning protrusion and different parts of the sealing ring 23, thereby improving the sealing effect of the sealing ring 23 on the gaps in different directions between the adapter 22 and the pole piece 21.

[0111] According to some embodiments of this application, such as Figure 7 , Figure 10 As shown, the positioning groove 2311 is located in the radial center of the first sealing part 231. Figure 7 , Figure 10 In the embodiment, the positioning groove 2311 is located on the surface of the first sealing part 231 toward the inward extension 212. In the thickness direction of the sealing ring 23, the positioning groove 2311 is the part with the smallest thickness of the sealing ring 23. The positioning groove 2311 is designed on the surface of the first sealing part 231 toward the inward extension 212 and located in the radial middle of the first sealing part 231, so that the part of the first sealing part 231 without the positioning groove 2311 and the second sealing part 232 can deform under the compression of the pole member 21 and the adapter 22 to seal the gap between the pole member 21 and the adapter 22, so as to ensure that the adapter 22 can limit the sealing ring 23 without affecting the sealing effect of the sealing ring 23.

[0112] According to some embodiments of this application, such as Figures 6-7As shown, the electrode assembly 2 also includes a first insulating member 24. At least a portion of the first insulating member 24 is disposed on the side of the outer extension 213 and the adapter 22 away from the electrode assembly 3, and at least another portion is disposed on the wall of the main body 211 and the through hole 222, and is in contact with the first sealing part 231. Specifically, the first insulating member 24 is fitted between the adapter 22 and the outer extension 213 of the terminal post 21. By setting the first insulating member 24, the insulation effect between the terminal post 21 and the adapter 22 can be better improved, reducing the probability of short circuit between the terminal post 21 and the adapter 22. The first insulating member 24, together with the sealing ring 23, can insulate and seal the inside and outside of the housing 1 after the adapter 22 is connected to the first housing wall 13, reducing the risk of electrolyte in the housing 1 leaking out of the housing 1 from the fitting gap between the adapter 22 and the terminal post 21, and reducing the risk of liquid or dust outside the housing 1 entering the housing 1 from the fitting gap between the adapter 22 and the terminal post 21, thereby improving the reliability of the battery cell 102.

[0113] Furthermore, at least a portion of the first insulating member 24 is disposed between the outer extension 213 and the adapter 22 to seal the gap between the outer extension 213 and the adapter 22; at least another portion of the first insulating member 24 is disposed between the main body 211 and the hole wall of the through hole 222 of the adapter 22 to seal the gap between the main body 211 and the hole wall of the through hole 222 of the adapter 22. Different portions of the first insulating member 24 respectively contact different portions of the main body 211 and the adapter 22 to improve the insulation effect of the first insulating member 24 on different portions between the adapter 22 and the pole piece 21.

[0114] It is worth mentioning that since the adapter 22 is made of metal, insulation is required between the pole piece 21 and the adapter 22. In some embodiments, the sealing ring 23 has both sealing and insulation effects. The first insulating member 24 is designed to at least partially contact the first sealing part 231, which can improve the insulation effect of the sealing ring 23 and the first insulating member 24 on the pole piece 21 and the adapter 22. This can more effectively isolate the pole piece 21 and the adapter 22, achieving insulation and sealing between the pole piece 21 and the adapter 22, thereby achieving insulation between the pole piece 21 and the housing 1.

[0115] In some embodiments, the first insulating member 24 is at least partially opposite and in contact with the first sealing portion 231 in the radial direction; in other embodiments, such as Figures 6-7 As shown, the end faces of the first insulating member 24 and the first sealing part 231 facing each other are both wedge-shaped surfaces. The contact between the two wedge-shaped surfaces can increase the contact area between the first insulating member 24 and the first sealing part 231, improve the insulation and sealing effect, and increase the friction between the first insulating member 24 and the first sealing part 231, so as to prevent the first insulating member 24 and the first sealing part 231 from being misaligned.

[0116] According to some embodiments of this application, such as Figure 4 , Figures 6-10 As shown, the electrode assembly 2 also includes a second insulating member 25, which is disposed on the side of the adapter 22 facing the electrode assembly 3, and includes an insulating body 251 and a first insulating protrusion 252. The insulating body 251 surrounds the outer periphery of the main body portion 211; the first insulating protrusion 252 is connected to the side of the insulating body 251 away from the adapter 22, and surrounds the outer periphery of the inner extension portion 212. (See reference...) Figure 4 , Figures 6-10 The insulating body 251 of the second insulating member 25 surrounds the outer periphery of the main body 211 and is located on the side surface of the adapter 22 facing the electrode assembly 3, so as to achieve insulation between the active material coating part 31 of the electrode assembly 3 and the adapter 22. The first insulating protrusion 252 of the second insulating member 25 surrounds the outer periphery of the inner extension 212, so as to achieve insulation between the active material coating part 31 of the electrode assembly 3 and the inner extension 212. By providing the second insulating member 25, insulation between the active material coating part 31 of the electrode assembly 3 and the inner extension 212 can be achieved, as well as insulation between the active material coating part 31 of the electrode assembly 3 and the adapter 22, which is beneficial to improving the reliability of the battery cell 102.

[0117] According to some embodiments of this application, such as Figure 4 , Figure 8As shown, the sealing ring 23 further includes a second sealing portion 232, which is angled and connected to the first sealing portion 231. The second sealing portion 232 is at least partially located between the hole wall of the through hole 222 and the main body portion 211. The second insulating member 25 further includes a second insulating protrusion 253, which is connected to the radially inner side of the insulating body 251. The second insulating protrusion 253 extends at least partially between the side of the adapter 22 facing the electrode assembly 3 and the inner extension portion 212, and is adjacent to the first sealing portion 231. Specifically, the sealing ring 23 is formed by connecting the first sealing portion 231 and the second sealing portion 232. The second sealing portion 232 is angled to the first sealing portion 231 so that the sealing ring 23 is bent. At this time, different parts of the sealing ring 23 can cooperate with different structures to achieve a sealing effect. The first sealing part 231 is sandwiched between the inner extension 212 and the adapter 22 to seal the gap between the inner extension 212 and the adapter 22; the second sealing part 232 is sandwiched between the main body 211 and the hole wall of the through hole 222 of the adapter 22 to seal the gap between the main body 211 and the hole wall of the through hole 222 of the adapter 22; the second insulating protrusion 253 extends to the gap between the inner extension 212 and the adapter 22 and is directly opposite to the outer surface of the first sealing part 231 in the radial direction, so as to improve the insulation effect of the sealing ring 23 and the second insulating part 25 between the electrode assembly 3 and the inner extension 212, and between the electrode assembly 3 and the adapter 22, and can more effectively isolate the electrode assembly 3 from the pole piece 21 and the adapter 22, so as to achieve the insulation and sealing between the electrode assembly 3 and the pole piece 21 and the adapter 22, thereby achieving the insulation between the pole piece 21 and the housing 1.

[0118] According to some embodiments of this application, such as Figures 6-7 As shown, the sealing ring 23 further includes a third sealing portion 233, which is angled and connected to the first sealing portion 231. The third sealing portion 233 at least partially surrounds the outer periphery of the inner extension 212; a portion of the third sealing portion 233 is located between the first sealing portion 231 and the insulating body 251, and another portion is located between the outer periphery of the inner extension 212 and the first insulating protrusion 252. (See reference...) Figures 6-7The sealing ring 23 is formed by connecting a first sealing part 231 and a third sealing part 233. The third sealing part 233 is set at an angle to the first sealing part 231, so that the sealing ring 23 is bent. At this time, different parts of the sealing ring 23 can cooperate with different structures to achieve a sealing effect. The first sealing part 231 is sandwiched between the inner extension 212 and the adapter 22 to seal the gap between the inner extension 212 and the adapter 22. At least a portion of the third sealing part 233 surrounds the outer periphery of the inner extension 212 and is located between the inner extension 212 and the first insulating protrusion 252, which can seal the gap between the inner extension 212 and the first insulating protrusion 252, further improving the sealing effect of the sealing ring 23 and helping to improve the reliability of the battery cell 102.

[0119] In some embodiments, such as Figure 4 , Figure 6 , Figure 7 As shown, a spacer 4 is also provided inside the housing 1. The spacer 4 is provided on the inner wall of the housing 1 and is located between the adapter 22 and the electrode assembly 3 to separate the adapter 22 and the electrode assembly 3, so as to prevent the adapter 22 and the electrode assembly 3 from contacting each other due to the shaking of the battery cell 102, thereby preventing the adapter 22 from conducting electricity to the housing 1.

[0120] Furthermore, the spacer 4 can be constructed in multiple ways, and gaps are formed between the multiple spacer 4 to allow the conductive part 32 of the electrode assembly 3 to pass through.

[0121] The second insulating member 25 may also have a third insulating protrusion 254, which is connected to the radially outer side of the insulating body 251 and extends in a direction away from the adapter 22. The third insulating protrusion 254 is located between the insulating body 251 and the spacer 4.

[0122] When assembling the battery cell 102 described above, multiple electrode components 3 are stacked along the thickness direction of the electrode component 3. The multiple electrode components 3 are stacked and pre-welded with multi-layered tabs of the same polarity to form the electrode component 3. Then, the electrode component 3 is installed into the housing 11, so that the conductive part 32 protrudes to the outside of the first housing wall 13. Next, a part of the conductive part 32 is laid on the terminal component 2 and welded. After welding, the terminal component 2 with the conductive part 32 is covered at the first housing wall 13. The adapter 22 is welded and fixed to the first housing wall 13 to achieve sealing.

[0123] According to some embodiments of this application, this application also provides a battery device 100, including a battery cell 102 as described in any of the above embodiments.

[0124] In the technical solution of this application embodiment, by using the above-mentioned battery cell 102, the sealing performance is better and the working reliability is higher.

[0125] According to some embodiments of this application, this application also provides an electrical device, which includes the battery cell 102 described above, or the battery device 100 described above, and the battery device 100 is used to provide electrical energy to the electrical device.

[0126] The power supply device can be any of the aforementioned devices or systems that utilize battery device 100.

[0127] In the technical solution of this application embodiment, by adopting the above-mentioned battery device 100, the assembly efficiency of the electrical device can be improved, and the performance and operational reliability of the electrical device can also be enhanced.

[0128] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0129] Although embodiments of this application have been shown and described above, variations, modifications, substitutions and alterations can be made to the above embodiments.

Claims

1. A battery cell (102), characterized in that, include: The shell (1) includes a first shell wall (13); The pole assembly (2) is disposed on the first shell wall (13) and includes a pole member (21), a connector (22) and a sealing ring (23). The connector (22) surrounds the pole member (21) and is connected to the first shell wall (13). The sealing ring (23) includes a first sealing part (231). In the thickness direction of the first shell wall (13), the first sealing part (231) is sandwiched between the pole member (21) and the connector (22). The electrode assembly (3) is housed within the housing (1) and includes an active material coating portion (31) and a conductive portion (32) connected to the active material coating portion (31), wherein the conductive portion (32) is connected to the electrode post (21). At least one of the pole piece (21) and the adapter (22) has a positioning protrusion on the side facing the first sealing part (231). The first sealing part (231) has a positioning groove (2311) that mates with the positioning protrusion. The positioning groove (2311) has a radial width of W1, and the positioning protrusion has a radial width of W2. W1 is greater than or equal to W2.

2. The battery cell (102) according to claim 1, characterized in that, The difference between W1 and W2 is less than or equal to 0.2 mm.

3. The battery cell (102) according to claim 1, characterized in that, The first sealing part (231) has a radial dimension of W, and the difference between W and W1 is greater than or equal to 0.8 mm.

4. The battery cell (102) according to claim 1, characterized in that, The adapter (22) has a through hole (222), and the pole piece (21) includes: An outer extension (213) is located on the side of the adapter (22) away from the electrode assembly (3); An inner extension (212) is located on the side of the adapter (22) near the electrode assembly (3); The main body (211) passes through the perforation (222) and is connected between the outer extension (213) and the inner extension (212). The first sealing part (231) is sandwiched between the inner extension (212) and the side of the adapter (22) facing the electrode assembly (3).

5. The battery cell (102) according to claim 4, characterized in that, The dimension of the positioning protrusion in the thickness direction of the first shell wall (13) is H1, and the distance between the side of the adapter (22) near the electrode assembly (3) and the inner extension (212) in the thickness direction of the first shell wall (13) is H2. H1 and H2 satisfy: 0.5≤H1 / H2≤0.

7.

6. The battery cell (102) according to claim 4, characterized in that, The sealing ring (23) further includes a second sealing part (232), which is angularly positioned and connected to the first sealing part (231), and the second sealing part (232) is at least partially located between the hole wall of the perforation (222) and the main body part (211).

7. The battery cell (102) according to claim 6, characterized in that, The positioning protrusion is located on the side of the adapter (22) facing the inner extension (212) and defines a portion of the through hole (222).

8. The battery cell (102) according to claim 7, characterized in that, The positioning groove (2311) is located near the second sealing part (232) of the first sealing part (231), and the side of the first sealing part (231) facing the adapter (22) and the side of the second sealing part (232) facing the adapter (22) together define the positioning groove (2311).

9. The battery cell (102) according to claim 7, characterized in that, The positioning groove (2311) is located in the radial middle of the first sealing part (231).

10. The battery cell (102) according to claim 6, characterized in that, The electrode assembly (2) further includes a first insulating member (24), which is at least partially disposed on the side of the outer extension (213) and the adapter (22) away from the electrode assembly (3) and is in contact with the second sealing part (232).

11. The battery cell (102) according to claim 4, characterized in that, The sealing ring (23) further includes a third sealing part (233), which is angularly disposed and connected to the first sealing part (231), and the third sealing part (233) at least partially surrounds the outer periphery of the inner extension (212).

12. The battery cell (102) according to claim 11, characterized in that, The positioning protrusion is located on the side of the inner extension (212) facing the adapter (22).

13. The battery cell (102) according to claim 12, characterized in that, The positioning groove (2311) is located near the third sealing part (233) of the first sealing part (231), and the side of the first sealing part (231) facing the inner extension (212) and the side of the third sealing part (233) facing the inner extension (212) together define the positioning groove (2311).

14. The battery cell (102) according to claim 12, characterized in that, The positioning groove (2311) is located in the radial middle of the first sealing part (231).

15. The battery cell (102) according to claim 11, characterized in that, The electrode assembly (2) further includes a first insulating member (24), at least a portion of which is disposed on the side of the outer extension (213) and the adapter (22) away from the electrode assembly (3), and at least another portion is disposed on the wall of the main body (211) and the perforation (222), and is in contact with the first sealing part (231).

16. The battery cell (102) according to claim 4, characterized in that, The electrode assembly (2) further includes: a second insulating member (25), disposed on the side of the adapter (22) facing the electrode assembly (3), and comprising: An insulating body (251) surrounds the outer periphery of the main body portion (211); A first insulating protrusion (252) is connected to the side of the insulating body (251) away from the adapter (22) and surrounds the outer periphery of the inner extension (212).

17. The battery cell (102) according to claim 16, characterized in that, The sealing ring (23) further includes a second sealing part (232), which is angularly disposed and connected to the first sealing part (231), and the second sealing part (232) is at least partially located between the hole wall of the perforation (222) and the main body part (211); The second insulating member (25) further includes a second insulating protrusion (253) connected to the radially inner side of the insulating body (251), the second insulating protrusion (253) extending at least partially between the side of the adapter (22) facing the electrode assembly (3) and the inner extension (212), and adjacent to the first sealing portion (231).

18. The battery cell (102) according to claim 16, characterized in that, The sealing ring (23) further includes a third sealing part (233), which is angularly disposed and connected to the first sealing part (231), and the third sealing part (233) at least partially surrounds the outer periphery of the inner extension (212); A portion of the third sealing portion (233) is located between the first sealing portion (231) and the insulating body (251), and another portion is located between the outer periphery of the inner extension (212) and the first insulating protrusion (252).

19. A battery device (100), characterized in that, Includes the battery cell (102) according to any one of claims 1-18.

20. An electrical appliance, characterized in that, It includes a battery cell (102) according to any one of claims 1-18; or, it includes a battery device (100) according to claim 19.

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