Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a battery monomer, a battery device and electric equipment, the battery monomer comprises a shell, an electrode assembly, an electrode terminal and an insulating part, the shell is provided with an accommodating cavity, and the shell comprises a first wall; the electrode assembly is at least partially located in the accommodating cavity, and the electrode assembly comprises an electrode main body and a tab led out from the electrode main body; the electrode terminal is at least partially arranged on the first wall, and the electrode terminal is electrically connected with the tab; the insulating part is arranged between the electrode terminal and the first wall; wherein the insulating part and at least part of the electrode terminal are of an integrally-formed structure, and a concave part is formed in the surface, facing the first wall, of the insulating part. According to the embodiment of the invention, the working performance and reliability of the battery monomer are improved.

Description

Technical Field

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

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] However, the electrode terminals are prone to misalignment during battery cell assembly and subsequent use, affecting the performance and reliability of the battery cells. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the performance and reliability of the battery cell.

[0005] In a first aspect, this application proposes a battery cell, including a housing, an electrode assembly, electrode terminals, and an insulating member. The housing has a receiving cavity and includes a first wall. The electrode assembly is at least partially located within the receiving cavity and includes an electrode body and a tab extending from the electrode body. The electrode terminals are at least partially disposed on the first wall and are electrically connected to the tabs. The insulating member is disposed between the electrode terminals and the first wall. The insulating member and at least a portion of the electrode terminals are integrally formed, and a recess is formed on the surface of the insulating member facing the first wall.

[0006] In the embodiments of this application, the battery cell includes a casing, an electrode assembly, electrode terminals, and an insulating component. The electrode assembly is disposed within a receiving cavity, and the casing provides containment and protection for the electrode assembly. On one hand, the insulating component can be integrally formed with at least a portion of the electrode terminals through injection molding, strengthening the bond between the insulating component and the electrode terminals. Then, the combined insulating component and at least a portion of the electrode terminals are assembled with a first wall, effectively reducing the probability of electrode terminal misalignment. On the other hand, a recess is formed on the surface of the insulating component facing the first wall, facilitating the fixing of the electrode terminals within the injection cavity and reducing the risk of electrode terminal misalignment due to injection pressure. In summary, the embodiments of this application improve the stability of electrode terminal assembly and use, reducing the likelihood of misalignment, thereby improving the working performance and reliability of the battery cell.

[0007] In some embodiments, the electrode terminal includes a pole, and the pole and the insulating member are integrally formed; or, the electrode terminal includes a pole and a riveting portion, the riveting portion and the insulating member are integrally formed, and the pole and the riveting portion are connected.

[0008] In these embodiments, the electrode terminals can be configured in various ways, which improves the applicability of the electrode terminals.

[0009] In some embodiments, the electrode terminal includes a terminal post, and the battery cell also includes a connector. The connector is located between the insulating member and the first wall, and the connector is connected to the first wall. The insulating member, the connector, and the terminal post are integrally formed.

[0010] In these embodiments, by providing a connector to the first wall and by molding the insulating member integrally with at least a portion of the connector and the electrode terminal, the connection between the electrode terminal and the insulating member and the first wall can be made more stable.

[0011] In some embodiments, the insulating member includes a body portion and a first side enclosure disposed on the side of the body portion away from the first wall, the body portion and the first side enclosure forming a receiving groove, at least a portion of the electrode terminals being located in the receiving groove, and a recess being formed on the surface of the body portion facing the first wall.

[0012] In these embodiments, the structure of the receiving groove provides better coverage of the electrode terminals, and the bonding strength between the insulating component and the electrode terminals is high.

[0013] In some embodiments, the insulating member further includes a partition portion disposed on the surface of the body portion away from the first wall and at least partially located within the receiving groove to divide the receiving groove into two receiving sub-grooves; the number of electrode terminals is two, and at least a portion of each electrode terminal is located in each receiving sub-groove.

[0014] In these embodiments, molding at least a portion of the two electrode terminals integrally with an insulating member can simplify the design and manufacturing of the battery cell, facilitate the assembly of each electrode terminal with the first wall, and provide good mechanical fit between the injection-molded insulating member and each electrode terminal.

[0015] In some embodiments, the body portion includes two sub-parts, each sub-part being disposed corresponding to a receiving sub-groove, and at least one sub-part having a recess formed on its surface facing the first wall.

[0016] In these embodiments, a portion of the sub-section forms the bottom of a receiving sub-groove, and at least one sub-section has a recess on its surface facing the first wall to facilitate injection molding of an insulating element from the back of the electrode terminal.

[0017] In some embodiments, each sub-part is provided with at least one recess.

[0018] In these embodiments, recesses are formed on both sub-parts, which can make the flow of injection material more uniform during injection molding and improve the reliability of the molded insulation part.

[0019] In some embodiments, the electrode terminal includes a post, the outer edge of which is fitted against the inner wall of the receiving slot, and one end of the post passes through the insulating member and the first wall to be electrically connected to the tab; or, the electrode terminal includes a post and a riveting portion, the outer edge of which is fitted against the inner wall of the receiving slot, the riveting portion having a riveting hole, one end of the post being connected to the riveting hole, and the other end of the post passing through the insulating member and the first wall to be electrically connected to the tab.

[0020] In these embodiments, whether the electrode post is connected to the plate or the riveted part is connected to the plate, the electrode terminal has a large connection area, thereby improving the current carrying capacity of the electrode terminal.

[0021] In some embodiments, the partition includes a first segment, a second segment, and a third segment. The extension direction of the second segment is parallel to the length direction of the first wall. The first segment is connected between one end of the second segment and the first edge of the first sidewall. The third segment is connected between the other end of the second segment and the second edge of the first sidewall. The first edge and the second edge are spaced apart along the width direction of the first wall.

[0022] In these embodiments, the second segment extends along the length of the first wall, which allows the pole or riveting portion located in the receiving sub-groove to have a longer extension area, so as to facilitate connection with the plate.

[0023] In some embodiments, a first through hole is formed at the bottom of each receiving sub-slot, and one end of the electrode terminal passes through the corresponding first through hole and is electrically connected to the corresponding electrode tab. Two first through holes are spaced apart at both ends of the body portion along the length direction of the first wall.

[0024] In these embodiments, two first vias are spaced apart at both ends of the body portion along the length of the first wall, which can make the two first vias have a longer interval, so that the positive and negative electrodes of the electrode assembly are spaced a longer distance apart, making it less likely to short-circuit.

[0025] In some embodiments, the battery cell further includes a connector located between the body portion and the first wall, the connector being connected to the first wall, and the insulating member further includes a second sidewall disposed on the side of the body portion opposite to the first sidewall, the second sidewall surrounding at least a portion of the connector.

[0026] In these embodiments, the second side surrounds at least a portion of the connector, and the insulation provides better coverage of the connector, thereby improving the bonding strength between the insulation and the connector.

[0027] In some embodiments, a clearance groove is also formed on the side of the insulating member near the first wall, and the clearance groove is spaced apart from the recess.

[0028] In these embodiments, the inclusion of clearance grooves can increase the molding yield of insulating components.

[0029] In some embodiments, the clearance groove extends along the length of the first wall.

[0030] In these embodiments, extending the clearance groove along the length of the first wall can reduce the difficulty of injection molding the insulating component and improve its reliability.

[0031] In some embodiments, the size of the recess is greater than or equal to 0.1 mm and less than or equal to 0.4 mm along the direction of the insulating member toward the first wall.

[0032] In these embodiments, by limiting the size of the recess to be greater than or equal to 0.1 mm and less than or equal to 0.4 mm, the probability of problems such as assembly interference and unstable assembly between the insulating component and the first wall is reduced, and the probability of the first wall having unexpected conduction with the pole or riveting part at the recess is also reduced.

[0033] In some embodiments, the shape of the recess projected onto the surface of the first wall is a circle with a diameter of less than or equal to 3 mm.

[0034] In these embodiments, by limiting the size of the recess to limit the amount of condensate that may accumulate in the recess, the negative impact of the recess on the insulation performance of the insulator is reduced.

[0035] In some embodiments, the housing includes a housing and an end cap, the housing having an opening, the end cap covering the opening and defining a receiving cavity with the housing, and a first wall located on the end cap.

[0036] In these embodiments, the first wall connected to the electrode terminals is located at the end cap, which facilitates the assembly of the electrode terminals and the housing, and the housing is designed to be detachable, which facilitates the assembly of the components of the battery cell.

[0037] Secondly, this application provides a battery device comprising a battery cell according to any of the first aspects of the above embodiments.

[0038] Thirdly, this application provides an electrical device that includes a battery cell from any of the first aspects of the above-described embodiments; or includes a battery device from the second aspect of the above-described embodiments, wherein the battery device is used to provide electrical energy.

[0039] 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

[0040] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0041] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0042] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0043] Figure 3 This is a schematic diagram of the structure of a battery module provided in one embodiment of this application;

[0044] Figure 4 This is a schematic diagram of the exploded structure of a single battery cell provided in an embodiment of this application;

[0045] Figure 5 This is a schematic diagram of the structure of the insulating component, terminal post, and connector in a battery cell provided in an embodiment of this application;

[0046] Figure 6 This is an exploded structural diagram of the insulating component, electrode post, and connector in a battery cell provided in an embodiment of this application;

[0047] Figure 7 This is one of the structural schematic diagrams of the insulating component in a battery cell provided in an embodiment of this application;

[0048] Figure 8 This is a second schematic diagram of the structure of the insulating component in a battery cell provided in an embodiment of this application;

[0049] Figure 9 This is a schematic diagram of the structure of the insulating component and the riveting part in a battery cell according to an embodiment of this application;

[0050] Figure 10 This is an exploded structural diagram of the insulating component and riveting part in a battery cell provided in an embodiment of this application;

[0051] Figure 11 This is the third schematic diagram of the structure of the insulating component in a battery cell provided in one embodiment of this application;

[0052] Figure 12 This is the fourth schematic diagram of the structure of the insulating component in a battery cell provided in one embodiment of this application;

[0053] Figure 13 This is a top view of the battery cell end cap, electrode terminals, and insulating components provided in an embodiment of this application.

[0054] Figure 14 yes Figure 13 Sectional view at point AA;

[0055] Figure 15 This is an exploded structural diagram of the end cap, electrode terminals, insulating components, and lower plastic of a battery cell provided in an embodiment of this application.

[0056] The accompanying drawings may not be drawn to scale.

[0057] Explanation of reference numerals in the attached figures:

[0058] 1000, vehicles;

[0059] 100. Battery assembly; 110. Controller; 120. Motor;

[0060] 200. Battery module;

[0061] 300. Enclosure; 301. First enclosure; 302. Second enclosure;

[0062] 10. Battery cells;

[0063] 1. Outer shell; 11. Shell; 111. Opening; 12. End cap; 13. First wall;

[0064] 3. Electrode assembly; 31. Electrode body; 32. Tab;

[0065] 4. Electrode terminal; 41. Electrode post; 42. Riveting part; 421. Riveting hole;

[0066] 5. Insulating component; 51. Body part; 511. Sub-part; 52. First side panel; 521. First edge; 522. Second edge; 53. Separator; 531. First segment; 532. Second segment; 533. Third segment; 54. Second side panel; 50. Recess; 500. Receiving groove; 501. Receiving sub-groove; 502. First through hole; 503. Clearance groove;

[0067] 6. Connector; 7. Lower plastic part. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0069] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0070] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0071] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication 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.

[0072] 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 three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0073] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0074] In this application, "multiple" means two or more (including two).

[0075] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied 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 battery device applications, market demand is also constantly increasing.

[0076] Electrode terminals are prone to misalignment during battery cell assembly and subsequent use, affecting the performance and reliability of the battery cell.

[0077] Battery devices often integrate multiple battery cells and connect them via a battery terminal. To reduce assembly difficulty, the surface area of ​​the battery cell's electrode terminals connecting to the battery terminal can be increased. However, during assembly and use of the electrode terminals and end caps, the electrode terminals themselves are prone to misalignment or displacement with the end caps, affecting the connection quality with the battery terminal and consequently impacting the battery cell's performance and reliability.

[0078] To address the aforementioned issues, this application provides a battery cell comprising a casing, electrode assemblies, electrode terminals, and an insulating component. The electrode assemblies are disposed within a receiving cavity, and the casing provides containment and protection for the electrode assemblies. On one hand, the insulating component can be integrally molded with at least a portion of the electrode terminals using an injection molding process, strengthening the bond between the insulating component and the electrode terminals. Subsequently, the assembled insulating component and at least a portion of the electrode terminals are assembled with a first wall, effectively reducing the probability of electrode terminal misalignment. On the other hand, a recess is formed on the surface of the insulating component facing the first wall, facilitating the fixing of the electrode terminals within the injection cavity and reducing the risk of electrode terminal misalignment due to injection pressure. In summary, this application improves the stability of electrode terminal assembly and use, reducing the likelihood of misalignment, thereby enhancing the working performance and reliability of the battery cell.

[0079] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical equipment using battery devices.

[0080] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0081] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0082] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either.

[0083] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or a battery pack. A battery pack generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0084] A single battery cell includes electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector includes a positive current-collecting section and a positive electrode tab connected to it. The current-collecting section is coated with the positive active material layer, while the tab is not. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section. The negative current collection section is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0085] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0086] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in 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 110 and a motor 120. The controller 110 is used to control the battery to supply power to the motor 120, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0087] 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.

[0088] Figure 2A schematic diagram of the structure of a battery device according to an embodiment of this application is shown.

[0089] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 10, which are connected in series, parallel, or mixed connections via a busbar.

[0090] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 10.

[0091] As an example, the battery cell assembly can be a battery module 200, which is formed by arranging and fixing multiple battery cells 10 into a single module. As an example, the battery module 200 can be formed by bundling multiple battery cells 10 together with cable ties.

[0092] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 300 and one or more battery cell assemblies housed in the housing 300.

[0093] As an example, the battery cell assembly can be a battery module 200, which can be housed in the housing 300 by fixing the battery module 200 in the housing 300.

[0094] As an example, the battery cell assembly can also be housed in the housing 300 by directly fixing multiple battery cells 10 to the housing 300.

[0095] As an example, the housing 300 may include a first housing 301 and a second housing 302. The first housing 301 and the second housing 302 cover each other, and together they define a closed receiving space for accommodating the battery cell assembly. Here, "closed" means covered or closed, and can be sealed or unsealed. The first housing 301 may be a top cover or a bottom plate.

[0096] The second box 302 can be a hollow structure with one end open, and the first box 301 is a plate-like structure. The first box 301 covers the open side of the second box 302 to form a box 300 with a receiving portion. Alternatively, both the first box 301 and the second box 302 can be hollow structures with one side open, and the open side of the first box 301 covers the open side of the second box 302 to form a box 300 with a receiving space. Of course, the first box 301 and the second box 302 can be of various shapes, such as cylinders, cuboids, etc.

[0097] As an example, the housing 300 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 300 forms an enclosed space to accommodate the battery cell assembly.

[0098] In some embodiments, the housing 300 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 300 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 300 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0099] Figure 3 A schematic diagram of the structure of a battery module according to an embodiment of this application is shown.

[0100] In some embodiments, such as Figure 2 and Figure 3 As shown, there are multiple battery cells 10. These multiple battery cells 10 are first connected in series, parallel, or in a mixed manner to form a battery module 200. The multiple battery modules 200 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing 300.

[0101] Multiple battery cells 10 in the battery module 200 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 10 in the battery module 200.

[0102] In this application, the battery cell 10 may include lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application are not limited to this.

[0103] A battery cell 10 refers to the smallest unit that makes up a battery. A battery cell 10 includes a casing 11, an end cap 12, and an electrode assembly 3.

[0104] Electrode assembly 3 is the component in the battery cell 10 where electrochemical reactions occur. The casing 11 may contain one or more electrode assemblies 3. Electrode assembly 3 is mainly formed by winding or stacking electrode sheets, which are divided into positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs can be located together at one end of the electrode body or separately at both ends of the electrode body. During the charging and discharging process of the battery cell 10, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0105] The electrode assembly 3 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0106] In some embodiments, electrode assembly 3 is a wound structure. The positive electrode and negative electrode are wound into a wound structure.

[0107] In some embodiments, the electrode assembly 3 is a stacked structure. As an example, multiple positive and negative electrodes can be provided, with multiple positive and multiple negative electrodes stacked alternately. Multiple spacers can be provided and respectively provided between any adjacent positive or negative electrodes. Alternatively, the spacers can be provided continuously and provided between any adjacent positive or negative electrodes by folding.

[0108] In some embodiments, the electrode assembly 3 may be cylindrical, flat, or polygonal, etc.

[0109] In some embodiments, the electrode assembly 3 is provided with tabs that can conduct current from the electrode assembly 3. The tabs include a positive tab and a negative tab.

[0110] The battery cell 10 may include a housing 11. The housing 11 is an assembly that mates with the end cap 12 to form an internal environment for the battery cell 10, wherein the formed internal environment can accommodate the electrode assembly 3, electrolyte (not shown in the figure), and other components. The housing 11 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 11), or an aluminum-plastic film, etc. In some embodiments, the housing 11 can be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a non-sealed structure, the housing 11 serves to protect the electrode assembly 3, and a sealing bag is included between the housing 11 and the electrode assembly 3. The sealing bag is used to encapsulate the electrode assembly 3 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 11 is a sealed structure, it is used to encapsulate the electrode assembly 3 and electrolyte, etc.

[0111] As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0112] The housing 11 and the end cap 12 can be independent components. One or more openings can be provided on the housing 11, and one or more end caps 12 can close the openings to form the internal environment of the battery cell 10. Optionally, the end cap 12 and the housing 11 can be integrated. Optionally, the end cap 12 and the housing 11 can form a common connection surface before other components are inserted into the housing, and the end cap 12 closes the housing 11 when it is necessary to encapsulate the interior of the housing 11.

[0113] In some embodiments, the electrode terminals can be disposed on the end cap 12 or on the housing 11, and the electrode terminals are electrically connected to the electrode tabs. The electrode terminals can be directly connected to the electrode tabs or indirectly connected to the electrode tabs through an adapter.

[0114] Please see Figures 4 to 7 In a first aspect, this application proposes a battery cell 10, which includes a housing 1, an electrode assembly 3, an electrode terminal 4, and an insulating member 5. The housing 1 has a receiving cavity and includes a first wall 13. The electrode assembly 3 is at least partially located in the receiving cavity and includes an electrode body 31 and a tab 32 extending from the electrode body 31. The electrode terminal 4 is at least partially disposed on the first wall 13 and is electrically connected to the tab 32. The insulating member 5 is disposed between the electrode terminal 4 and the first wall 13. The insulating member 5 and at least a portion of the electrode terminal 4 are integrally formed, and a recess 50 is formed on the surface of the insulating member 5 facing the end cap 12.

[0115] Optionally, the outer casing 1 includes a housing 11 and an end cap 12. The housing 11 has an opening 111, and the end cap 12 covers the opening 111 and defines a receiving cavity with the housing 11. The first wall 13 can be located in the housing 11 or in the end cap 12. For ease of explanation, this embodiment of the application is illustrated by the first wall 13 being located in the end cap 12. Optionally, the end cap 12 can be a sheet-like structure, or it can be understood that the first wall 13 is the end cap 12.

[0116] The insulating element 5 and at least a portion of the electrode terminal 4 are integrally formed. For example, the insulating element 5 can be prepared by injection molding. During injection molding, at least a portion of the electrode terminal 4 is placed into the injection cavity, thereby making the insulating element 5 and at least a portion of the electrode terminal 4 integrally formed.

[0117] Electrode terminal 4 refers to the structure of a battery cell 10 used for connecting to other battery cells 10 or for connecting to an external conductor. Generally, because the electrode terminal 4 has the above-mentioned connecting function, multiple battery cells 10 inside the battery device 100 are not stacked sequentially with the surface where the electrode terminal 4 is provided as the contact surface, but are stacked sequentially through other surfaces of the battery cells 10 that are not provided with electrode terminals 4.

[0118] The insulating component 5 refers to a structure made of insulating material used to separate the electrode terminal 4 and the end cover 12. It can fix the electrode terminal 4 and the end cover 12 relative to each other, and at the same time achieve insulation between the electrode terminal 4 and the end cover 12, thereby improving the reliability of the battery cell 10.

[0119] Reference Figure 5 Electrode terminal 4 may consist only of electrode post 41, which is directly electrically connected to the electrode plate. Alternatively, refer to... Figure 9The electrode terminal 4 includes a post 41 and a riveting portion 42 electrically connected to the post 41, the riveting portion 42 being electrically connected to a plate. At least a portion of the insulating member 5 is integrally connected to the electrode terminal 4 via injection molding. If the riveting portion 42 is not provided, the insulating member 5 is integrally connected to the post 41 via injection molding; if the riveting portion 42 is provided, the insulating member 5 and the riveting portion 42 are integrally connected via injection molding. Injection molding means that when the insulating member 5 is injection molded, at least a portion of the electrode terminal 4 is located within the injection molding cavity and integrally formed with the insulating member 5.

[0120] The insulating component 5 is an injection-molded structure and is integrally connected to at least part of the electrode terminal 4 by injection molding. Taking the hot runner injection molding process as an example, before preparing the insulating component 5, the pole post 41 or the riveting part 42 is pre-embedded in the injection cavity of the mold. The side surface of the electrode terminal 4 used to connect with the bar is the front side. The area of ​​the front side needs to be set to be large, and the injection material needs to be exposed on the front side. Therefore, the injection port is set to face the back side of the pole post 41 or the riveting part 42. The injection space is large, which makes it easier to inject the glue. It can also fix the pole post 41 or the riveting part 42 from the front side. For example, the wall of the injection cavity is pressed against the front side, which reduces the interference of the injection material covering the electrode terminal 4. Moreover, compared with the injection scheme from the front or side, the injection pressure is less likely to cause the pole post 41 or the riveting part 42 to move when injecting from the back side. After the injection material is molded, the insulating component 5 is formed.

[0121] In hot runner injection molding, parameters such as temperature, flow rate, and pressure of the injection material can be controlled more precisely, thereby reducing defects such as shrinkage and surface imperfections. However, the placement of the injection port inside the mold in hot runner injection molding creates a notch on the product, resulting in a recess 50 on the surface of the insulating part 5 facing the end cap 12.

[0122] Therefore, by injecting the molding material into the mold in a direction perpendicular to the back of the electrode post 41 or the riveting part 42, the probability of the electrode post 41 or the riveting part 42 shifting during the injection molding of the insulating part 5 can be reduced, thereby improving the molding accuracy and quality of the integral structure of the electrode terminal 4 and the insulating part 5. The integral structure of the electrode post 41 or the riveting part 42 and the insulating part 5 allows the electrode terminal 4 to directly or indirectly abut against the end cap 12 through the insulating part 5, thereby improving the connection stability between the electrode terminal 4 and the end cap 12 and reducing the probability of electrical connection failure due to relative misalignment between the electrode terminal 4 and the end cap 12.

[0123] In this embodiment, the battery cell 10 includes a housing 1, an electrode assembly 3, electrode terminals 4, and an insulating member 5. The electrode assembly 3 is disposed within a receiving cavity, and the housing 1 provides housing and protection for the electrode assembly 3. On one hand, the insulating member 5 can be integrally formed with at least a portion of the electrode terminals 4 through injection molding, strengthening the bond between the insulating member 5 and the electrode terminals 4. Then, the combined insulating member 5 and at least a portion of the electrode terminals 4 are assembled with the first wall 13, effectively reducing the probability of misalignment of the electrode terminals 4. On the other hand, a recess 50 is formed on the surface of the insulating member 5 facing the end cap 12, facilitating the fixing of the electrode terminals 4 within the injection cavity and reducing the risk of misalignment caused by injection pressure. In summary, this embodiment improves the stability of the electrode terminals 4 during assembly and use, reducing the likelihood of misalignment, thereby improving the working performance and reliability of the battery cell 10.

[0124] In some embodiments, refer to Figures 5 to 8 The electrode terminal 4 includes a terminal post 41, which is integrally formed with the insulating member 5. Alternatively, in some other embodiments, refer to... Figures 8 to 14 The electrode terminal 4 includes a pole post 41 and a riveting part 42. The riveting part 42 and the insulating part 5 are integrally formed. The pole post 41 is connected to the riveting part 42.

[0125] The riveting part 42 refers to a structure that allows the terminal post 41 to pass through and be fixed, and to be electrically connected to the terminal post 41. The riveting part 42 has a surface parallel to the end cap 12 for conductive connection with current-carrying components such as the battery pack, thereby improving the current-carrying capacity of the battery cell 10 while achieving energy collection. Generally, the riveting part 42 is a plate structure made of metal. The terminal post 41 can be cylindrical, and can be riveted to the riveting hole 421 and then welded.

[0126] In these embodiments, the electrode terminal 4 can be configured in various ways, which improves the applicability of the electrode terminal 4.

[0127] Reference Figure 5 and Figure 6 In some embodiments, the electrode terminal 4 includes a pole post 41, and the battery cell 10 also includes a connector 6. The connector 6 is located between the insulating member 5 and the first wall 13, and the connector 6 is connected to the first wall 13. The insulating member 5 is integrally formed with the connector 6 and the pole post 41.

[0128] The connector 6 can be ring-shaped with a hollowed-out area in the middle to facilitate glue injection through the glue injection port on the back of the electrode terminal 4. The connector 6 can be connected to the end cap 12 by welding. The insulating part 5 separates the electrode terminal 4 from the connector 6 to prevent the electrode terminal 4 from conducting through the connector 6 to the end cap 12. It is understood that the insulating part 5 should at least expose the welded position between the connector 6 and the end cap 12.

[0129] In these embodiments, by providing the connector 6 connected to the first wall 13, and by molding the insulating member 5 integrally with at least a portion of the connector 6 and the electrode terminal 4 through injection molding, the connection between the electrode terminal 4 and the insulating member 5 and the first wall 13 can be made more stable.

[0130] The connector 6 can be installed in battery cells 10 without rivets. In battery cells 10 with rivets 42, the connector 6 is not required; instead, the insulating member 5 can be fixed between the rivet 42 and the end cap 12 by connecting the terminal post 41 to the rivet 42 and the tab 32 or adapter component respectively. Figure 14 As shown.

[0131] Reference Figure 6 and Figure 7 In some embodiments, the insulating member 5 includes a body portion 51 and a first side enclosure 52 disposed on the side of the body portion 51 away from the first wall 13. The body portion 51 and the first side enclosure 52 enclose to form a receiving groove 500. At least a portion of the electrode terminals 4 are located in the receiving groove 500. A recess 50 is formed on the surface of the body portion 51 facing the first wall 13.

[0132] The first side circumference 52 may be annular and surround the side of the electrode terminal 4. The opening of the receiving groove 500 exposes the front of the electrode terminal 4 so that the electrode terminal 4 can be connected to the plate. The receiving groove 500 covers the side and part of the back of the electrode terminal 4 to separate the electrode terminal 4 from the first wall 13 and to insulate the electrode terminal 4 from the first wall 13. The recess 50 is located on the surface of the body portion 51 facing the end cap 12.

[0133] In these embodiments, the structure of the receiving groove 500 provides better coverage of the electrode terminal 4, and the bonding strength between the insulating member 5 and the electrode terminal 4 is high.

[0134] In some embodiments, the insulating member 5 further includes a partition 53, which is disposed on the surface of the body portion 51 away from the first wall 13 and is at least partially located within the receiving groove 500 to divide the receiving groove 500 into two receiving sub-grooves 501; the number of electrode terminals 4 is two, and at least a portion of each electrode terminal 4 is located in each receiving sub-grooves 501.

[0135] One of the two electrode terminals 4 can serve as the positive electrode of the battery cell 10, and the other can serve as the negative electrode of the battery cell 10. At least a portion of the two electrode terminals 4 are integrally formed with the insulating member 5 in the injection cavity of the mold. The separator 53 separates the two electrode terminals 4 to prevent the two electrode terminals 4 from being short-circuited.

[0136] Optionally, the partition 53 may extend beyond the opening of the receiving groove 500. When the electrode terminal 4 is connected to the bar, the partition 53 may also prevent accidental contact between the corresponding bars of the two electrode terminals 4, which could lead to a short circuit.

[0137] In these embodiments, molding at least a portion of the two electrode terminals 4 integrally with an insulating member 5 can simplify the design and manufacturing of the battery cell 10, facilitate the assembly of each electrode terminal 4 with the first wall 13, and provide good mechanical fit between the injection-molded insulating member 5 and each electrode terminal 4.

[0138] Reference Figure 7 and Figure 8 In some embodiments, the body portion 51 includes two sub-portions 511, each sub-portion 511 being disposed corresponding to a receiving sub-groove 501, and at least one sub-portion 511 having a recess 50 formed on its surface facing the first wall 13.

[0139] Optionally, the recess 50 can be formed on one of the sub-parts 511, in which case the recess 50 can be located near the center point of the body part 51, so that the flow of the injection molding material is more uniform during injection molding. Optionally, the recess 50 can also be formed on both sub-parts 511, in which case the recess 50 can be located near the center point of the sub-parts 511.

[0140] In these embodiments, a portion of the sub-part 511 forms the bottom of the receiving sub-groove 501, and at least one sub-part 511 has a recess 50 formed on the surface facing the first wall 13 to facilitate injection molding of the insulating member 5 from the back of the electrode terminal 4.

[0141] In some embodiments, each sub-part 511 is provided with at least one recess 50.

[0142] In these embodiments, recesses 50 are formed on both sub-parts 511, which can make the flow of injection material more uniform during injection molding and improve the reliability of the molded insulating part 5.

[0143] Reference Figures 5 to 8 In some embodiments, the electrode terminal 4 includes a pole post 41, the outer edge of which is fitted to the inner wall of the receiving sub-slot 501, and one end of the pole post 41 passes through the insulating member 5 and the first wall 13 and is electrically connected to the tab 32.

[0144] Or, refer to Figures 9 to 14 In other embodiments, the electrode terminal 4 includes a pole post 41 and a riveting part 42. The outer edge of the riveting part 42 is fitted to the inner wall surface of the receiving sub-groove 501. The riveting part 42 has a riveting hole 421. One end of the pole post 41 is connected to the riveting hole 421, and the other end of the pole post 41 passes through the insulating member 5 and the first wall 13 and is electrically connected to the electrode tab 32.

[0145] Depending on the assembly method, the pole post 41 can also be configured with different structures.

[0146] Optionally, the pole post 41 can be directly electrically connected to the plate without the need for a riveting part 42 as an intermediate component. The outer edge of the pole post 41 is fitted against the inner wall of the receiving slot 501, allowing the side of the pole post 41 away from the end cover 12 to have a larger area. The pole post 41 can be irregularly shaped. For example, the pole post 41 can be L-shaped.

[0147] Optionally, the terminal post 41 can be indirectly electrically connected to the battery pack via the riveting part 42. The outer edge of the riveting part 42 is fitted to the inner wall of the receiving slot 501. The riveting part 42 can not only provide auxiliary fixing for the terminal post 41, but also serve as an intermediate carrier for the electrical connection between the terminal post 41 and the battery pack. The current carrying capacity of the battery cell 10 is improved by extending the surface area. The terminal post 41 can be made smaller, and the side of the riveting part 42 away from the end cover 12 has a larger area.

[0148] In these embodiments, the electrode terminal 4 has a large connection area, whether the electrode post 41 is connected to the plate or the riveting part 42 is connected to the plate, thereby improving the current carrying capacity of the electrode terminal 4.

[0149] Reference Figure 6 or Figure 10 In some embodiments, the partition 53 includes a first segment 531, a second segment 532, and a third segment 533. The extension direction of the second segment 532 is parallel to the length direction of the first wall 13. The first segment 531 is connected between one end of the second segment 532 and the first edge 521 of the first side wall 52. The third segment 533 is connected between the other end of the second segment 532 and the second edge 522 of the first side wall 52. The first edge 521 and the second edge 522 are spaced apart along the width direction of the first wall 13.

[0150] The length direction of the first wall 13 refers to the direction in which the larger surface of the first wall 13 extends relatively longer (see reference). Figure 4 The X-axis direction in the diagram), the width direction of the first wall 13 refers to the direction in which the larger surface of the first wall 13 extends relatively short (refer to the X-axis direction in the diagram). Figure 4 (Y-axis direction in the diagram). For example, the large surface of the first wall 13 can be rectangular.

[0151] In these embodiments, the second segment 532 extends along the length of the first wall 13, which allows the pole post 41 or the riveting portion 42 located in the receiving sub-groove 501 to have a longer extension area so as to facilitate connection with the plate.

[0152] In some embodiments, a first through hole 502 is formed at the bottom of each receiving sub-slot 501, and one end of the electrode terminal 4 passes through the corresponding first through hole 502 and is electrically connected to the corresponding electrode tab 32. Two first through holes 502 are spaced apart at both ends of the body portion 51 along the length direction of the first wall 13.

[0153] One end of the electrode terminal 4 passes through the corresponding first through hole 502 and is electrically connected to the corresponding electrode tab 32. That is, one end of the positive electrode post 41 passes through a first through hole 502 and is electrically connected to the positive electrode tab 32, and one end of the negative electrode post 41 passes through another first through hole 502 and is electrically connected to the negative electrode tab 32.

[0154] In these embodiments, two first vias 502 are spaced apart at both ends of the body portion 51 along the length direction of the first wall 13, which can make the two first vias 502 have a longer interval, so that the interval between the positive electrode tab 32 and the negative electrode tab 32 of the electrode assembly 3 is longer and less likely to short circuit.

[0155] Reference Figures 6 to 8 In some embodiments, the battery cell 10 further includes a connector 6 located between the body portion 51 and the first wall 13, and the connector 6 is connected to the first wall 13. The insulating member 5 also includes a second side circumference 54 disposed on the side of the body portion 51 opposite to the first side circumference 52, and the second side circumference 54 surrounds at least a portion of the connector 6.

[0156] The annular connector 6 can extend at least partially into the insulator 5, so that the second sidewall 54 can cover the end of the connector 6 away from the first wall 13, and the part not covered by the second sidewall 54 can be used for welding to the first wall 13.

[0157] In these embodiments, the second side 54 is disposed around at least a portion of the connector 6, and the insulation 5 provides better coverage of the connector 6, thereby improving the bonding strength between the insulation 5 and the connector 6.

[0158] Reference Figure 11 and Figure 12 In some embodiments, an anti-cavity groove 503 is also formed on the side of the insulating member 5 near the first wall 13, and the anti-cavity groove 503 is spaced apart from the recess 50.

[0159] The insulating component 5 has a relatively thick portion, making it difficult to mold. By providing the clearance groove 503, the injection molding difficulty of the insulating component 5 can be effectively reduced, and the product quality can be improved. For example, the clearance groove 503 can be disposed opposite to the second segment 532 on the front and back sides of the body portion 51.

[0160] In these embodiments, the provision of the clearance groove 503 can increase the molding yield of the insulating part 5.

[0161] In some embodiments, the clearance groove 503 extends along the length direction of the first wall 13.

[0162] Both the clearance groove 503 and the second segment 532 extend along the length of the first wall 13, which can reduce the molding difficulty of the second segment 532, thereby reducing the injection molding difficulty of the insulating part 5 and improving product quality.

[0163] In these embodiments, the extension of the clearance groove 503 along the length of the first wall 13 can reduce the difficulty of injection molding of the insulating component 5 and improve the reliability of the insulating component 5.

[0164] In some embodiments, the size of the recess 50 is greater than or equal to 0.1 mm and less than or equal to 0.4 mm along the direction of the insulating member 5 toward the first wall 13.

[0165] Along the direction of the insulating component 5 toward the first wall 13, the size of the recess 50 is greater than or equal to 0.1 mm. In other words, the height of the injection port inside the mold is at least 0.1 mm, so that the injection material can enter the injection mold at a preset pressure and flow smoothly to the farthest position, thereby improving the injection quality of the insulating component 5. At the same time, it can also reduce the probability of overflow defects at the recess 50, which could lead to assembly interference or instability between the insulating component 5 and the first wall 13.

[0166] Along the direction of the insulating member 5 toward the first wall 13, the size of the recess 50 is less than or equal to 0.4 mm, so that the body part 51 has sufficient thickness to meet the insulation requirements and reduce the probability of the first wall 13 unexpectedly conducting with the pole post 41 or the riveting part 42 at the recess 50.

[0167] In these embodiments, by limiting the size of the recess 50 to be greater than or equal to 0.1 mm and less than or equal to 0.4 mm, the probability of assembly interference or unstable assembly between the insulating member 5 and the first wall 13 is reduced, and the probability of unintended conduction between the first wall 13 and the pole post 41 or the riveting part 42 at the recess 50 is also reduced. For example, the depth of the recess 50 can be 0.1 mm, 0.2 mm, 0.3 mm, or 0.4 mm.

[0168] In some embodiments, the maximum dimension of the recess 50 on the plane containing the insulator 5 is less than or equal to 0.3 mm. In practice, during long-term use, some condensate may accumulate in the internal assembly gaps of the battery cell 10. By limiting the size of the recess 50, the amount of condensate that may accumulate in the recess 50 is limited, thereby reducing the negative impact of the recess 50 on the insulation performance of the insulator 5. Exemplarily, the orthographic projection of the recess 50 onto the large surface of the first wall 13 is circular, with a diameter less than or equal to 3 mm, such as 3 mm, 2.8 mm, 2.5 mm, 2.2 mm, or 2 mm. It is understood that the circular shape includes perfect circles and approximately circular shapes.

[0169] In some embodiments, the housing 1 includes a housing 11 and an end cap 12. The housing 11 has an opening 111, and the end cap 12 covers the opening 111 and defines a receiving cavity with the housing 11. A first wall 13 is located on the end cap. The first wall 13, which is connected to the electrode terminal 4, is located on the end cap 12, which facilitates the assembly of the electrode terminal 4 with the housing 1. The housing 1 is designed to be detachable, which facilitates the assembly of the components of the battery cell 10.

[0170] Reference Figure 15 In some embodiments, the battery cell 10 further includes a lower plastic insert 7 disposed between the first wall 13 and the electrode assembly 3. The lower plastic insert 7 serves as a support bracket, positioned between the electrode assembly 3 and the first wall 13. When the first wall 13 is pressed against the electrode assembly 3, the lower plastic insert 7 also provides support and cushioning. By providing the lower plastic insert 7, connection space is provided between the tab 32 and the electrode terminal 4, and the main body of the electrode assembly 3 and the first wall 13 are separated, reducing the risk of short circuit between the electrode assembly 3 and the first wall 13.

[0171] Optionally, multiple electrode assemblies 3 can be disposed within the battery cell 10, and two or more electrode assemblies 3 can be disposed along the thickness direction of the electrode assembly 3 (see reference). Figure 4 The Y-axis direction in the image is set up in sequence.

[0172] Secondly, embodiments of this application provide a battery device 100, including a battery cell 10 from any of the embodiments of the first aspect described above.

[0173] Thirdly, embodiments of this application provide an electrical device including a battery cell 10 from any of the embodiments of the first aspect described above, or a battery device 100 from the embodiments of the second aspect described above. The battery cell 10 or the battery device 100 is used to provide electrical energy to the electrical device.

[0174] The electrical equipment can be any of the aforementioned devices or systems that utilize battery devices 100.

[0175] Please see Figures 4 to 15According to some embodiments of this application, this application provides a battery cell 10, a housing 1, an electrode assembly 3, electrode terminals 4, and an insulating member 5. The housing 1 has a receiving cavity and includes a first wall 13. The housing 1 includes a shell 11 and an end cap 12. The shell 11 has an opening 111, and the end cap 12 covers the opening 111 and defines the receiving cavity with the shell 11. The first wall 13 is located on the end cap 12. The electrode assembly 3 is at least partially located in the receiving cavity and includes an electrode body 31 and a tab 32 extending from the electrode body 31. The electrode terminals 4 are at least partially disposed on the first wall 13 and are electrically connected to the tabs 32. The insulating member 5 is disposed between the electrode terminals 4 and the first wall 13. The insulating member 5 and at least a portion of the electrode terminals 4 are integrally formed, and a recess 50 is formed on the surface of the insulating member 5 facing the first wall 13. The insulating member 5 includes a body portion 51 and a first sidewall 52 disposed on the side of the body portion 51 facing away from the first wall 13. The body portion 51 and the first sidewall 52 together form a receiving groove 500. At least a portion of the electrode terminals 4 are located in the receiving groove 500. A recess 50 is formed on the surface of the body portion 51 facing the first wall 13. The insulating member 5 also includes a partition portion 53, which is disposed on the surface of the body portion 51 facing away from the first wall 13 and is at least partially located within the receiving groove 500, so as to divide the receiving groove 500 into two receiving sub-grooves 501. There are two electrode terminals 4, and at least a portion of each electrode terminal 4 is located in its respective receiving sub-grooves 501.

[0176] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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 by, The battery cell comprises: a housing having a receiving cavity, the housing comprising a first wall; an electrode assembly at least partially located in the receiving cavity, the electrode assembly comprising an electrode body and a tab led out from the electrode body; an electrode terminal at least partially arranged on the first wall, the electrode terminal being electrically connected with the tab; an insulating member arranged between the electrode terminal and the first wall; wherein the insulating member and at least part of the electrode terminal are integrally formed, and a surface of the insulating member facing the first wall is formed with a recess.

2. The battery cell of claim 1, wherein, The electrode terminal comprises a pole, and the pole and the insulating member are integrally formed. Alternatively, the electrode terminal comprises a pole and a riveting portion, the riveting portion and the insulating member are integrally formed, and the pole is connected with the riveting portion.

3. The battery cell of claim 2, wherein, The electrode terminal comprises a pole, and the battery cell further comprises a connecting member located between the insulating member and the first wall, the connecting member being connected with the first wall, and the insulating member, the connecting member and the pole are integrally formed.

4. The battery cell of claim 1, wherein, The insulating member comprises a body portion and a first side wall arranged on a side of the body portion away from the first wall, the body portion and the first side wall form a receiving groove, at least part of the electrode terminal is located in the receiving groove, and a surface of the body portion facing the first wall is formed with the recess.

5. The battery cell of claim 4, wherein, The insulating member further comprises a partition portion arranged on a surface of the body portion away from the first wall and at least partially located in the receiving groove, so as to divide the receiving groove into two receiving sub-grooves. The number of the electrode terminals is two, and at least part of each electrode terminal is located in each receiving sub-groove.

6. The battery cell of claim 5, wherein, The body portion comprises two sub-portions, each sub-portion is arranged corresponding to each receiving sub-groove, and at least one sub-portion is formed with the recess on a surface thereof facing the first wall.

7. The battery cell of claim 6, wherein, Each sub-portion is arranged corresponding to at least one recess.

8. The battery cell of claim 5, wherein, The electrode terminal comprises a pole, an outer edge of the pole is arranged in abutment with an inner wall surface of the receiving sub-groove, and one end of the pole is electrically connected with the tab through the insulating member and the first wall. Alternatively, the electrode terminal comprises a pole and a riveting portion, an outer edge of the riveting portion is arranged in abutment with an inner wall surface of the receiving sub-groove, the riveting portion is provided with a riveting hole, one end of the pole is connected with the riveting hole, and the other end of the pole is electrically connected with the tab through the insulating member and the first wall.

9. The battery cell of claim 5, wherein, The partition portion comprises a first segment, a second segment and a third segment, an extension direction of the second segment is parallel to a length direction of the first wall, the first segment is connected between one end of the second segment and a first edge of the first side wall, the third segment is connected between the other end of the second segment and a second edge of the first side wall, and the first edge and the second edge are arranged in interval along a width direction of the first wall.

10. The battery cell of claim 5, wherein, A bottom of each receiving sub-groove is formed with a first through hole, one end of the electrode terminal is electrically connected with the corresponding tab through the corresponding first through hole, and two first through holes are arranged in interval at two ends of the body portion along the length direction of the first wall.

11. The battery cell of claim 4, wherein, The battery cell further comprises a connecting piece located between the insulating piece and the first wall, the insulating piece further comprises a second side wall arranged on a side of the body part away from the first side wall, and the second side wall surrounds at least part of the connecting piece.

12. The battery cell of any one of claims 1 to 11, wherein, The insulating piece further comprises a clearance groove arranged on a side of the insulating piece close to the first wall, and the clearance groove is spaced apart from the recess.

13. The battery cell of claim 12, wherein, The clearance groove extends along the length direction of the first wall.

14. The battery cell of any one of claims 1 to 11, wherein, The size of the recess in the direction of the insulating piece towards the first wall is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

15. The battery cell of claim 14, wherein, The shape of the orthographic projection of the recess on the surface of the first wall is a circle with a diameter less than or equal to 3 mm.

16. The battery cell of any one of claims 1-11, wherein, The shell comprises a shell body and an end cover, the shell body is provided with an opening, the end cover is arranged on the opening and defines the accommodating cavity together with the shell body, and the first wall is located on the end cover.

17. A battery device characterized by comprising: The battery cell as claimed in any one of claims 1 to 16.

18. An electrical device, characterized by The battery cell as claimed in any one of claims 1 to 16 is used to provide electric energy, or the battery device as claimed in claim 17 is used to provide electric energy.

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