Battery cell, battery device, and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an electrode assembly, an electrode terminal and an insulating part, and the shell is provided with an accommodating cavity and a first wall; the electrode assembly is at least partially accommodated in the accommodating cavity, and the electrode assembly comprises a main body part and a tab led out from the main body part; the electrode terminal is arranged on the first wall, the electrode terminal comprises a riveting block which is at least partially arranged on one side, deviating from the accommodating cavity, of the first wall, and the tab is electrically connected with the bar sheet through the riveting block; the insulating part is arranged between the riveting block and the first wall; wherein the riveting block and the insulating part are of an integrated structure, and a first groove is formed in the side, away from the insulating part, of the riveting block. The first groove can be in positioning fit with a supporting column in an injection mold so as to improve the manufacturing precision of the integrated structure of the insulating part and the riveting block, meanwhile, the first groove can be matched with the supporting column so as to support the riveting block, and the probability that the riveting block deforms due to impact in the injection molding process is reduced.

Description

Technical Field

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

[0002] Riveting blocks are components in battery cells used to fix the terminals and make electrical connections between the terminals and other components. Riveting blocks improve the current carrying capacity of battery cells by extending the surface area and are widely used in various battery products.

[0003] However, during the assembly and subsequent use of battery cells, the rivet block is prone to misalignment with the terminal post, which greatly affects the working performance and reliability of the battery cell. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device. The battery cell integrates the rivet block and the insulating component into a single structure, which improves the connection stability of the rivet block. At the same time, a first groove is provided on the rivet block to make the integrated structure of the rivet block and the insulating component highly fabricable.

[0005] In a first aspect, this application provides a battery cell, which includes a housing, an electrode assembly, electrode terminals, and an insulating member. The housing has a receiving cavity and a first wall. The electrode assembly is at least partially received within the receiving cavity and includes a main body and tabs extending from the main body. The electrode terminals are disposed on the first wall and include a rivet block at least partially disposed on the side of the first wall away from the receiving cavity. The tabs are electrically connected to a plate through the rivet block. The insulating member is disposed between the rivet block and the first wall. The rivet block and the insulating member are integrally formed, and a first groove is formed on the side of the rivet block away from the insulating member.

[0006] In this embodiment of the battery cell, the riveting block can be pre-embedded in the mold of the insulating component to form an integral structure with the insulating component. By fixing it relative to the insulating component, the probability of misalignment between the riveting block and the terminal post is reduced. Specifically, a first groove is formed on the side of the riveting block facing away from the insulating component. This first groove can cooperate with the support column in the injection mold during the injection molding process of the insulating component to improve the manufacturing accuracy of the integral structure of the insulating component and the riveting block. Simultaneously, the first groove can cooperate with the support column in the injection mold to support the riveting block, reducing the probability of deformation due to impact during injection molding and improving the reliability of the connection between the riveting block and the terminal post.

[0007] In some embodiments, the depth of the first groove is greater than or equal to 0.001 mm along the extending direction of the first groove.

[0008] In this embodiment, the first groove has sufficient depth to allow the support column inside the injection mold to enter and restrict the support column from continuing to move in a plane perpendicular to the extension direction of the first groove.

[0009] In some embodiments, the depth of the first groove is less than or equal to 0.05 mm along the extending direction of the first groove.

[0010] In this embodiment, there is a reasonable height difference between the bottom of the first groove and the surface of the rivet block away from the insulating component, so that the solder can flow into the first groove during the subsequent welding process of the rivet block and the plate, so that the first groove and the plate can be welded together to improve the current carrying capacity of the rivet block.

[0011] In some embodiments, the orthographic projection of the first groove onto the rivet block is circular.

[0012] In this embodiment, the processing of the first groove is facilitated, allowing the solder to flow uniformly within the first groove to improve the welding quality of the rivet block and the ferrule.

[0013] In some embodiments, the first groove is disposed parallel to the surface of the rivet block away from the insulating element.

[0014] In this embodiment, on the one hand, it facilitates the processing and preparation of the first groove, and on the other hand, it enables the solder to fill the first groove more quickly and evenly, thereby enhancing the welding effect between the rivet block and the ferrule.

[0015] In some embodiments, the riveting block includes a body portion and a connecting portion connected together, and the electrode terminal further includes an electrode post, which is at least partially disposed on the side of the first wall facing the electrode assembly and connected to the body portion. The connecting portion protrudes from one side of the body portion along a first direction and is used to connect with a bar plate. The first direction is parallel to the first wall.

[0016] In this embodiment, the electrode terminal is connected to the electrode post via the body of the rivet block. In addition to the body of the rivet block for fixing the electrode post, a connecting part is added to the rivet block. The connecting part can increase the welding area between the rivet block and the electrode plate, thereby improving the current carrying capacity of the electrode terminal. The connecting part and the body of the rivet block extend in a first direction parallel to the first wall to facilitate the fixed installation of the rivet block with the first wall and the outer shell.

[0017] In some embodiments, at least one first groove is located at the connection portion and is formed therein, and at least one first groove is centrally symmetrically distributed in a first direction.

[0018] In this embodiment of the application, the support column in the injection mold preferentially supports the connecting part protruding from the body part, so the first groove is provided in the connecting part to connect with the support column.

[0019] In some embodiments, when multiple first grooves are formed, the distance between two adjacent first grooves is greater than or equal to 2 mm and less than or equal to 10 mm.

[0020] In this embodiment, the multiple first grooves can form a positioning and docking effect for the multiple support columns in the injection mold. The multiple first grooves are spaced apart to reduce the negative impact of increasing the number of first grooves on the welding quality of the rivet block and the brace.

[0021] In some embodiments, a second groove is formed on the side of the body portion away from the insulating member.

[0022] In this embodiment, some additional support columns are provided in the injection mold corresponding to the main body, and the second groove can partially accommodate these support columns to improve the positioning accuracy of the rivet block in the injection mold.

[0023] In some embodiments, the size of the second groove is less than or equal to the size of the first groove in the plane where the rivet block is located, and / or in the direction from the rivet block to the insulator.

[0024] In this embodiment, the size of the second groove is reduced to decrease the negative impact of setting the second groove on the welding area of ​​the rivet block and improve the flow capacity of the rivet block.

[0025] In some embodiments, an adhesive inlet is formed on the side of the insulating member opposite to the rivet block, and the orthographic projection of the adhesive inlet on the rivet block is located at the connection portion.

[0026] In this embodiment, the insulating component can be injection molded using a hot runner mold. At the same time, the injection port is located in a relatively slender connecting part, which can reduce the flow resistance of the molten injection material and improve the molding quality of the insulating component.

[0027] In some embodiments, the size of the glue inlet is greater than or equal to 0.1 mm and less than or equal to 0.4 mm in the direction from the insulating member to the riveting block.

[0028] In this embodiment, on the one hand, the probability of glue overflow at the glue inlet causing assembly interference between the insulating component and the first wall is reduced, and on the other hand, the insulating component between the glue inlet and the riveting block has sufficient thickness to meet the insulation performance requirements.

[0029] In some embodiments, the orthographic projection of the glue inlet onto the insulating component is a circle with a diameter of less than or equal to 0.3 mm.

[0030] In this embodiment, the amount of condensate that may be stored between the glue inlet and the first wall during subsequent battery use is reduced, thereby reducing the probability of unexpected conduction at the glue inlet and improving the insulation performance of the battery cell.

[0031] Secondly, this application provides a battery device, which includes a housing and a battery cell provided in any of the foregoing embodiments, wherein the battery cell is housed in the housing.

[0032] Thirdly, this application provides an electrical device, which includes the aforementioned battery device, and the battery device is used to provide electrical energy. Attached Figure Description

[0033] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0034] Figure 1 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the structure of a battery according to an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of a battery module according to an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0038] Figure 5 for Figure 4 The diagram shows the structure of the outer casing and electrode terminals in a single battery cell.

[0039] Figure 6 for Figure 5 A schematic diagram of the structure of the riveting block and the insulating component in the electrode terminal shown;

[0040] Figure 7 for Figure 6 A schematic diagram of the insulation component from another perspective.

[0041] The specific markings in the attached diagram are as follows:

[0042] 1000, vehicles;

[0043] 100. Battery assembly; 200. Controller; 300. Motor;

[0044] 10. Box body; 11. First box body section; 12. Second box body section;

[0045] 20. Battery cell pack; 21. Battery cell;

[0046] 211. Outer shell; 212. First wall; 213. Pole post; 214. Riveting block; 2141. Body part; 2142. Connecting part; 2151. First groove; 2152. Second groove; 216. Insulating component; 2161. Glue inlet.

[0047] The accompanying drawings are not necessarily drawn to scale. Detailed Implementation

[0048] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0051] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0053] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0054] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0055] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0056] Currently, judging from market trends, the application of power batteries and energy storage batteries is becoming increasingly widespread. They 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 the application areas of power batteries and energy storage batteries, the market demand is also constantly increasing.

[0057] Power batteries often integrate multiple battery cells and connect them via terminals. To reduce assembly difficulty, each battery cell has a rivet block at its end cap. This rivet block serves two purposes: it helps to secure the terminals and it acts as an intermediate carrier for the electrical connection between the terminals and the terminals. By increasing the surface area, it enhances the current-carrying capacity of the battery cell. Rivet blocks are widely used in various battery products.

[0058] However, during actual assembly and use, the rivet block and the terminal post are prone to misalignment, which affects the connection quality and consequently the working performance and reliability of the battery cell.

[0059] In related products, the rivet block is fixedly integrated with the upper plastic part of the battery cell to improve the stability of the connection between the rivet block and the terminal post. For example, the rivet block is pre-embedded in the injection mold of the upper plastic part, making the rivet block and the upper plastic part a single structure. However, as a plate-like structure with a relatively small thickness, the rivet block is easily deformed by the impact of the injection molding material during the injection molding of the upper plastic part, causing it to warp towards the side away from the upper plastic part. This warping not only affects the subsequent welding quality of the rivet block to the battery cell, but also encroaches on the internal space of the power battery, easily causing assembly interference with other components.

[0060] To address this, support pillars are added within the injection mold to support the rivet block during production. These pillars continuously support the rivet block during injection molding to reduce the probability of warping under high injection pressure. However, the support pillars still cannot prevent the rivet block from moving horizontally under the impact of the injection material, leading to misalignment between the rivet block and the upper plastic part. This negatively impacts the installation quality of the rivet block and results in poor connection quality due to continued misalignment between the rivet block and the pole.

[0061] Based on the above considerations, this application provides a battery cell. The battery cell has a first groove on the side of the rivet block away from the insulating component. The injection mold of the insulating component has a support column corresponding to the first groove. The support column can support the rivet block to reduce the probability of the rivet block warping and deforming under the impact of the injection molding material. The first groove can cooperate with the support column to realize the positioning of the rivet block in the injection mold, thereby improving the manufacturing accuracy of the integrated structure of the insulating component and the rivet block.

[0062] 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.

[0063] 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 the embodiments of this application are not limited to this.

[0064] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0065] As an example, the battery cell 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.

[0066] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0067] The solutions in this application can be applied, but are not limited to, battery devices that include individual battery cells, and can also be applied to electrical devices that include both individual battery cells and battery devices.

[0068] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0069] 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.

[0070] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 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. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is provided 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.

[0071] 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.

[0072] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell groups 20 for providing voltage and capacity. A battery cell group may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0073] In some embodiments, a battery cell group is typically formed by arranging multiple battery cells; as an example, a battery cell group can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0074] In some embodiments, the battery device 100 may be a battery pack, which includes a housing and one or more battery cell groups 20 housed in the housing.

[0075] Please see Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell pack 20, the battery cell pack 20 being housed within the housing 10.

[0076] The housing 10 is used to house individual battery cells, and the housing 10 can have various structures. In some embodiments, the housing 10 may include a first housing portion 11 and a second housing portion 12, which overlap each other, and together define a receiving portion for housing the battery cell assembly 20. The second housing portion 12 may be a hollow structure with one end open, and the first housing portion 11 may be a plate-like structure, with the first housing portion 11 covering the open side of the second housing portion 12 to form a housing 10 with a receiving portion; alternatively, the first housing portion 11 and the second housing portion 12 may both be hollow structures with one side open, with the open side of the first housing portion 11 covering the open side of the second housing portion 12 to form a housing 10 with a receiving portion. Of course, the first housing portion 11 and the second housing portion 12 can have various shapes, such as cylinders, cuboids, etc.

[0077] As an example, the battery cell pack 20 can be a battery module, which can be housed in the housing by fixing the battery module in the housing.

[0078] As an example, the battery cell pack 20 can also be housed in the housing by directly fixing multiple battery cells to the housing.

[0079] In some embodiments, the housing may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing may be at least a portion of the floor of the vehicle 1000, or a portion of the housing may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0080] In some embodiments, the battery device 100 may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0081] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell pack 20 provided in an embodiment of this application. The battery cell pack 20 includes multiple battery cells 21, which are first connected in series, parallel, or mixed to form the battery cell pack 20, and then the battery cell pack 20 is housed in a casing.

[0082] Please see Figures 4 to 7 , Figure 4 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the outer casing and electrode terminals in the battery cell 21; Figure 6 This is a schematic diagram of the structure of the riveting block and insulating component in the electrode terminal; Figure 7 This is a structural schematic diagram of the insulating component from another perspective.

[0083] This application provides a battery cell 21, including a housing, an electrode assembly, electrode terminals, and an insulating member 216. The housing has a receiving cavity and a first wall 212. The electrode assembly is at least partially received within the receiving cavity. The electrode terminals are disposed on the first wall 212, and each electrode terminal includes a riveting block 214 at least partially disposed on the side of the first wall 212 opposite to the receiving cavity. The electrode tab is electrically connected to the electrode plate through the riveting block 214. The insulating member 216 is disposed between the riveting block 214 and the first wall 212. The insulating member 216 and the riveting block 214 are integrally formed, and a first groove 2151 is formed on the side of the riveting block 214 opposite to the insulating member 216.

[0084] The electrode assembly includes a main body and tabs extending from the main body. The tabs allow current to be drawn from the main body and include a positive tab and a negative tab. Electrode terminals can be directly connected to the tabs or indirectly connected via current collectors. The main body includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell 21, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0085] The riveting block 214 is a structure used to achieve a conductive connection between the inner electrode assembly and the outer battery plate. The riveting block 214 is fixed to the first wall 212 to facilitate conductive connection with current-carrying components such as the battery plate, thereby improving the current-carrying capacity of the battery cell 21 while simultaneously achieving energy convergence. Generally, the riveting block 214 is a plate structure made of metal.

[0086] The insulating component 216 refers to a structure made of insulating material used to separate the rivet block 214 and the first wall 212. It can achieve the relative fixation of the rivet block 214 and the first wall 212 while insulating the rivet block 214 and the first wall 212, thereby improving the reliability of the battery cell 21.

[0087] In the battery cell 21 provided in this application embodiment, the riveting block 214 and the insulating member 216 are integrally structured. The riveting block 214 abuts against the first wall 212 through the insulating member 216 to improve the connection stability between the riveting block 214 and the electrode assembly inside the shell, and reduce the probability of electrical connection failure caused by relative misalignment between the riveting block 214 and the electrode assembly.

[0088] Specifically, during the preparation of the rivet block 214 and the insulating component 216, the rivet block 214 is pre-embedded in the mold, and the insulating component 216 is prepared by injection molding so that the insulating component 216 is directly integrated with the rivet block 214. During this process, the injection mold is provided with a support column for supporting the rivet block 214. A first groove 2151 is provided on the side of the rivet block 214 facing away from the insulating component 216. The first groove 2151 can be positioned and engaged with the support column so that the support column supports the rivet block 214, reducing the probability of warping and deformation of the rivet block 214 caused by the impact of the molten injection material.

[0089] According to some embodiments of this application, optionally, the first groove 2151 is formed together with the riveting block 214. Exemplarily, before the riveting block 214 is placed into the injection mold, the riveting block 214 with the first groove 2151 is prepared by stamping and then placed into the injection mold to be formed together with the insulating part 216.

[0090] According to other embodiments of this application, optionally, the first groove 2151 is formed during the preparation of the insulating component 216. Exemplarily, the riveting block 214 is a flat plate-like structure, and a support column is provided in the injection mold corresponding to the riveting block 214 to support it. During the injection molding process, after the molten injection material impacts the riveting block 214, the portion supported by the support column forms the first groove 2151. After the first groove 2151 is formed, it can cooperate with the support column to restrict further movement of the riveting block 214 in a horizontal plane perpendicular to the extension direction of the first groove 2151, thereby improving the positioning effect between the riveting block 214 and the insulating component 216.

[0091] According to some embodiments of this application, the depth of the first groove 2151 along the extending direction of the first groove 2151 is greater than or equal to 0.001 mm.

[0092] The extending direction of the first groove 2151 refers to the direction from the riveting block 214 to the insulating member 216. Generally, the riveting block 214 and the insulating member 216 are stacked along the height direction of the battery cell 21. For example, please refer to Figure 4 The Z direction in the middle.

[0093] In other words, the side of the first groove 2151 facing away from the rivet block 214 is recessed by at least 0.001 mm relative to the surface of the rivet block 214 facing away from the insulating member 216.

[0094] For example, the bottom of the first groove 2151 is a curved structure, and the minimum distance between the side of the curved structure away from the rivet block 214 and the surface of the rivet block 214 away from the insulating member 216 is 0.001mm.

[0095] Therefore, there is a sufficient height difference between the first groove 2151 and the rivet block 214 to allow the support column in the injection mold to enter, and the side wall of the first groove 2151 can restrict the movement of the support column, thereby improving the positioning accuracy between the rivet block 214 and the insulating part 216.

[0096] According to some embodiments of this application, the depth of the first groove 2151 along the extending direction of the first groove 2151 is less than or equal to 0.05 mm.

[0097] In other words, the side of the first groove 2151 facing away from the rivet block 214 is recessed by at most 0.05 mm relative to the surface of the rivet block 214 facing away from the insulating member 216.

[0098] For example, the bottom of the first groove 2151 is a curved structure, and the maximum distance between the side of the curved structure away from the rivet block 214 and the surface of the rivet block 214 away from the insulating member 216 is 0.05mm.

[0099] Therefore, there is a reasonable height difference between the first groove 2151 and the rivet block 214, so that the solder can flow smoothly into and fill the first groove 2151 during the subsequent welding process of the rivet block 214 with the bar sheet, thereby realizing the welding conductive connection between the first groove 2151 and the bar sheet and improving the current carrying capacity of the rivet block 214.

[0100] According to some embodiments of this application, the orthographic projection of the first groove 2151 onto the riveting block 214 is circular.

[0101] It is understandable that circles include perfect circles and approximately circles.

[0102] Therefore, on the one hand, the processing difficulty of the first groove 2151 is reduced; on the other hand, the circular first groove 2151 is smooth and has few sharp edges, which helps the solder to spread and flow evenly inside the first groove 2151, thereby improving the welding quality of the rivet block 214 and the bar sheet. In addition, the circular first groove 2151 also facilitates the preparation of its corresponding circular support column, reducing the difficulty of preparing the integrated structure of the rivet block 214 and the insulating part 216.

[0103] In other embodiments, the orthographic projection of the first groove 2151 onto the riveting block 214 is a polygon or approximately a polygon to accommodate different injection molding conditions or production requirements.

[0104] According to some embodiments of this application, the first groove 2151 is arranged parallel to the surface of the riveting block 214 away from the insulating member 216.

[0105] It is understood that parallelism includes both parallel and substantially parallel situations. For example, the flatness of the surface of the first groove 2151 facing away from the insulating member 216 is no higher than 0.001 mm. For instance, the flatness of the surface of the first groove 2151 facing away from the insulating member 216 is 0.0005 mm.

[0106] This reduces the difficulty of manufacturing the first groove 2151 or the support column inside the mold, and also facilitates the rapid and uniform filling of the first groove 2151 with solder when welding the rivet block 214 and the platen, thus improving the welding quality of the rivet block 214 and the platen. Furthermore, this arrangement helps maintain a consistent thickness of the insulating member 216 between the first groove 2151 and the first wall 212, improving the effect of the insulating member 216 in assisting in the relative fixation between the rivet block 214 and the first wall 212.

[0107] It is understood that there are two electrode terminals, which are electrically connected to the positive and negative electrode tabs respectively. For example, please refer to [link to example]. Figure 4 or Figure 5 Along a first direction, such as the width direction of the battery cell 21 (refer to the Y direction in the figure), the two electrode terminals are arranged adjacent to each other.

[0108] According to some embodiments of this application, the riveting block 214 includes a body portion 2141 and a connecting portion 2142 connected to each other. The electrode terminal also includes a pole post 213, which is at least partially disposed on the side of the first wall 212 facing the electrode assembly and connected to the body portion 2141. The connecting portion 2142 protrudes from one side of the body portion 2141 along a first direction and is used to connect with a bar plate, wherein the first direction is parallel to the first wall.

[0109] The terminal post 213 refers to the structure of a battery cell 21 used for connecting to other battery cells 21 or for connecting to an external conductor. Generally, because the terminal post 213 has the above-mentioned connecting function, multiple battery cells 21 inside the battery device are not stacked sequentially with the surface where the terminal post 213 is provided as the contact surface, but are stacked sequentially through other surfaces of the battery cells 21 that are not provided with the terminal post 213.

[0110] Optionally, in a second direction perpendicular to the first direction, such as the thickness direction of the battery cell 21 (X direction in the reference figure), the size of the connecting portion 2142 is smaller than the size of the body portion 2141. For example, please refer to... Figure 5 The rivet block 214 is L-shaped.

[0111] Alternatively, the rivet blocks 214 in the two electrode terminals are arranged opposite to each other, and the connecting part 2142 of one rivet block 214 is correspondingly arranged at the notch position of the other rivet block 214, so as to improve the integration of the electrode terminals and facilitate conductive connection between different battery cells 21.

[0112] Thus, the electrode terminals are connected to the electrode assembly via the body portion 2141 of the riveting block 214 and the electrode post 213. In addition to the body portion 2141 used to fix the electrode post 213, the riveting block 214 also has a connecting portion 2142. By providing the connecting portion 2142, the welding area between the riveting block 214 and the electrode plate is increased, thereby improving the current-carrying capacity of the electrode terminals. Furthermore, the connecting portion 2142 and the body portion 2141 extend in a first direction parallel to the first wall 212 to facilitate the fixed installation of the riveting block 214 with the first wall 212 and the outer casing 211.

[0113] According to some embodiments of this application, a first groove 2151 is located in the connecting portion 2142 and is formed therein at least one.

[0114] It is understandable that the elongated connecting part 2142 is more prone to warping and deformation due to impact from the injection material during the injection molding process. Therefore, the support pillars in the injection mold preferentially support the connecting part 2142, and the connecting part 2142 is provided with a first groove 2151 corresponding to the support pillar, which helps the connecting part 2142 and the body part 2141 to present a relatively flat posture during the injection molding process.

[0115] Optionally, at least one first groove 2151 is centrally symmetrically distributed in the connecting portion 2142.

[0116] Optionally, at least one first groove 2151 is distributed at the end of the connecting portion 2142 away from the body portion 2141.

[0117] Optionally, when multiple first grooves 2151 are provided, the distance between two adjacent first grooves 2151 is greater than or equal to 2mm, so as to reduce the situation where the spacing between the first grooves 2151 is too close, which would make it difficult for the solder to flow, and reduce the negative impact of setting the first grooves on the welding quality of the rivet block 214 and the ferrule.

[0118] Optionally, when multiple first grooves 2151 are provided, the distance between two adjacent first grooves 2151 is less than or equal to 10mm, so that the first grooves 2151 can cooperate with the support column to form a good positioning effect, reducing the occurrence of twisting of the rivet block 214 in the injection mold due to the excessive distance between two first grooves 2151 affecting the positioning effect, thereby reducing the deformation of the connection part 2142 that may occur during the injection molding process.

[0119] Optionally, the first groove 2151 is provided with three, and the three reinforcing structures are distributed at equal intervals along the first direction in the connecting part 2142.

[0120] Thus, multiple first grooves 2151 cooperate with multiple support columns to form support for the connection part 2142, which is more likely to deform during injection molding, in order to disperse the impact of the injection molding material, thereby reducing the probability of the rivet block 214 warping and deforming during the injection molding of the insulating part 216.

[0121] According to some other embodiments of this application, at least one first groove 2151 is provided at one end of the connecting portion 2142 away from the body portion 2141, so as to reduce the probability of the rod end of the rivet block 214 warping during the injection molding process.

[0122] Please see Figure 6 According to some embodiments of this application, a second groove 2152 is formed on the side of the body portion 2141 opposite to the insulating member 216.

[0123] Optionally, the second groove 2152 has the same shape as the first groove 2151, so that the second groove 2152 and the first groove 2151 can be prepared simultaneously.

[0124] Therefore, the second groove 2152 allows the injection mold to provide a corresponding support column at the body part to support the body part 2141, reducing the probability that the body part 2141 will deform due to the impact of the injection material during the injection process.

[0125] Please see Figure 6It is understandable that, since the main body 2141 has a mounting hole through which the pole post 213 can pass, a placeholder post is provided in the injection mold corresponding to the mounting hole. The placeholder post can provide a certain support effect for the main body 2141 during the injection molding process. Therefore, the probability of the main body 2141 being deformed by the impact of the injection material is lower than the probability of the connecting part 2142 being deformed by the impact of the injection material.

[0126] Optionally, within the plane of the riveting block 214, the size of the second groove 2152 is smaller than the size of the first groove 2151. The shape of the second groove 2152 may be the same as or different from the shape of the first groove 2151.

[0127] Optionally, in the direction from the riveting block 214 to the insulating member 216, the size of the second groove 2152 is smaller than the size of the first groove 2151. In other words, the depth of the second groove 2152 is smaller than the depth of the first groove 2151, so that the solder can fill the second groove 2152 before the first groove 2151 is filled.

[0128] Thus, the second groove 2152 cooperates with the support column to provide sufficient support for the body part 2141 to reduce the amount of deformation that may occur under the impact of the injection molding material, while leaving as much surface area as possible for direct welding with the plate, which helps to improve the flow capacity of the rivet block 214.

[0129] 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 use of internal gates in hot runner injection molding inevitably results in notches or protrusions on the product.

[0130] Please see Figure 7 According to some embodiments of this application, the glue inlet 2161 is formed on the side of the insulating member 216 away from the riveting block 214 to reduce the negative impact of the glue inlet 2161 on the assembly between the insulating member 216 and the riveting block 214 or between the insulating member 216 and the first wall 212.

[0131] Optionally, the orthographic projection of the injection port 2161 on the riveting block 214 is located at the connecting portion 2142, so that the injection material flows from the relatively narrow connecting portion 2142 to the relatively wide body portion 2141, reducing flow resistance and increasing the flow speed of the injection material in the mold, thereby improving the injection quality of the insulating part 216.

[0132] Therefore, the injection material enters the mold in a direction perpendicular to the rivet block 214, which can reduce the probability of the rivet block 214 shifting during the injection molding of the insulating part 216, thereby improving the molding accuracy and quality of the integral structure of the rivet block 214 and the insulating part 216.

[0133] According to some embodiments of this application, optionally, the size of the gate 2161 along the direction from the insulating member 216 to the riveting block 214 is greater than or equal to 0.1 mm. In other words, the height of the mold's built-in gate is at least 0.1 mm, so that the injection molding material can enter the injection mold at a preset pressure and flow smoothly to the farthest body part 2141, improving the injection molding quality of the insulating member 216. At the same time, it reduces the probability of overflow defects at the gate 2161, which could lead to assembly interference or unstable assembly between the insulating member 216 and the first wall 212.

[0134] According to some embodiments of this application, optionally, the size of the glue inlet 2161 is less than or equal to 0.4 mm along the direction from the insulating member 216 to the riveting block 214, so that the insulating member 216 between the glue inlet 2161 and the riveting block 214 has sufficient thickness to meet the insulation requirements, thereby reducing the probability of the first wall 212 unexpectedly conducting with the riveting block 214 at the glue inlet 2161.

[0135] According to some embodiments of this application, optionally, the maximum size of the glue inlet 2161 on the plane of the insulating member 216 is less than or equal to 0.3 mm. In reality, during long-term use, some condensate will accumulate in the internal assembly gaps of the battery cell 21. By limiting the size of the glue inlet 2161, the amount of condensate that may accumulate at the glue inlet 2161 is limited, thereby reducing the negative impact of the glue inlet 2161 on the insulation performance of the insulating member 216. Exemplarily, the orthographic projection of the glue inlet 2161 onto the insulating member 216 is a circle, and the diameter of the circle is less than or equal to 0.3 mm.

[0136] Secondly, embodiments of this application provide a battery device, which includes a housing and at least one battery cell as provided in any embodiment of the first aspect, wherein the battery cell is housed within the housing.

[0137] Thirdly, embodiments of this application provide an electrical device, which includes a battery device as provided in any embodiment of the second aspect, the battery device being used to provide electrical energy.

[0138] Please see Figures 4 to 7This application provides a battery cell 21, which includes a housing 211, an electrode assembly, electrode terminals, and an insulating member 216. The electrode terminals include a terminal post 213 and a riveting block 214. The terminal post 213 passes through a first wall 212 and is electrically connected to the riveting block 214. The riveting block 214 and the first wall 212 are separated by the insulating member 216. A first groove 2151 and a second groove 2152 are formed on the side of the riveting block 214 away from the insulating member 216. The first groove 2151 is located in the elongated connecting portion 2142, and the second groove 2152 is located in the body portion 2141 through which the terminal post 213 passes. Both the first groove 2151 and the second groove 2152 extend toward the insulating member 216. An adhesive inlet 2161 is provided on the side of the insulating member 216 away from the riveting block 214. The orthogonal projection of the adhesive inlet 2161 on the riveting block 214 is located in the connecting portion 2142.

[0139] When the insulating component 216 is manufactured, the rivet block 214 is pre-embedded in the injection mold. The first groove 2151 and the second groove 2152 can cooperate with the support column in the injection mold to realize the positioning of the body part 2141 and the connecting part 2142, so as to reduce the possible shaking of the rivet block 214 in the XoY plane, improve the integration and manufacturing accuracy of the rivet block 214 and the insulating component 216, thereby improving the fixing effect of the rivet block 214 and the first wall 212, reducing the possible misalignment between the rivet block 214 and the electrode post 213, and improving the performance of the battery cell.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing has a receiving cavity and a first wall; An electrode assembly, at least partially housed within the receiving cavity, the electrode assembly including a main body and tabs extending from the main body; An electrode terminal is disposed on the first wall. The electrode terminal includes a rivet block that is at least partially disposed on the side of the first wall opposite to the receiving cavity. The electrode tab is electrically connected to the plate through the rivet block. An insulating component is disposed between the riveting block and the first wall; The riveting block and the insulating component are integrally formed, and a first groove is formed on the side of the riveting block opposite to the insulating component.

2. The battery cell according to claim 1, characterized in that, Along the extending direction of the first groove, the depth of the first groove is greater than or equal to 0.001 mm.

3. The battery cell according to claim 2, characterized in that, Along the extending direction of the first groove, the depth of the first groove is less than or equal to 0.05 mm.

4. The battery cell according to claim 3, characterized in that, The first groove has a circular shape as its orthographic projection onto the rivet block.

5. The battery cell according to claim 4, characterized in that, The bottom of the first groove is arranged parallel to the surface of the rivet block that is away from the insulating component.

6. The battery cell according to claim 1, characterized in that, The riveting block includes a body portion and a connecting portion connected together. The electrode terminal also includes an electrode post. The electrode post is at least partially disposed on the side of the first wall facing the electrode assembly and connected to the body portion. The connecting portion protrudes from one side of the body portion along a first direction and is used to connect with a bar plate. The first direction is parallel to the first wall.

7. The battery cell according to claim 6, characterized in that, The first groove is located at the connecting portion and is formed in at least one form, and at least one of the first grooves is centrally symmetrically distributed in the first direction.

8. The battery cell according to claim 7, characterized in that, When multiple first grooves are formed, the distance between two adjacent first grooves is greater than or equal to 2 mm and less than or equal to 10 mm.

9. The battery cell according to claim 6, characterized in that, A second groove is formed on the side of the body portion opposite to the insulating member.

10. The battery cell according to claim 9, characterized in that, In the plane where the rivet block is located, and / or in the direction from the rivet block to the insulator, the size of the second groove is less than or equal to the size of the first groove.

11. The battery cell according to claim 6, characterized in that, The insulating component has an adhesive inlet on the side opposite to the riveting block, and the orthographic projection of the adhesive inlet on the riveting block is located at the connecting portion.

12. The battery cell according to claim 11, characterized in that, Along the direction from the insulating member to the riveting block, the size of the glue inlet is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

13. The battery cell according to claim 11, characterized in that, The shape of the orthographic projection of the glue inlet onto the insulating component is a circle with a diameter of less than or equal to 0.3 mm.

14. A battery device, characterized in that, It includes a housing and at least one battery cell as described in any one of claims 1 to 13, wherein the battery cell is housed within the housing.

15. An electrical appliance, characterized in that, Includes the battery device as described in claim 14, the battery device being used to provide electrical energy.

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