Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell and an insulation layer. The shell has a containing cavity for containing an electrode assembly, and the shell comprises an end cover and a shell body. The shell body comprises a side plate and a bottom plate, the end cover is provided with an electrode terminal, the bottom plate is arranged opposite to the end cover, and a plurality of first grooves arranged at intervals are arranged on the side surface of the side plate away from the containing cavity. The insulation layer covers the side surface of the shell away from the containing cavity, the insulation layer covers the groove wall of the first grooves, and the second grooves corresponding to the first grooves are formed on the surface away from the shell, and the second grooves are used for containing adhesive. The technical scheme of the application can improve the connection strength of the battery monomer and the side plate of the module, and improve the operation stability of the battery monomer.

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 appliance. Background Technology

[0002] With the development of new energy technologies, batteries are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, and power tools.

[0003] Currently, battery cells are assembled into battery packs using end plates and side plates. The connection strength between battery cells and side plates is low, and battery cells may shift during operation, causing battery cell malfunctions. 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 connection strength between the battery cell and the module side plate and enhance the operational stability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, including a casing and an insulating layer. The casing has a receiving cavity for accommodating electrode components, and the casing includes an end cap and a housing. The housing includes a side plate and a bottom plate. The end cap is provided with electrode terminals, and the bottom plate is disposed opposite to the end cap. The side plate has a plurality of spaced-apart first grooves on its surface opposite to the receiving cavity. The insulating layer covers the surface of the housing opposite to the receiving cavity, covers the groove walls of the first grooves, and forms a second groove corresponding to the first groove on the surface opposite to the housing. The second groove is used to accommodate adhesive.

[0006] In the technical solution of this application embodiment, the outer shell is divided into an end cap and a housing. The housing can accommodate electrode components and electrolyte, while the end cap can be equipped with electrode terminals and pressure relief mechanisms, etc. The aforementioned energy saving facilitates the assembly of battery cells. An insulating layer is provided on the housing to achieve insulation of the housing and reduce the risk of short circuits or leakage in the battery cells. Specifically, a first groove is provided on the side surface of the housing facing the module side plate. The portion of the insulating layer covering the first groove is recessed to form a second groove. The second groove has a certain depth. Compared with the flat surface of the housing, the second groove increases the volume of adhesive, improves the bonding stability of the adhesive, thereby reducing the risk of battery cell displacement and improving the operational stability of the battery cells.

[0007] In some embodiments, the insulating layer is an insulating film layer formed on the surface of the housing by a spraying process. In the above structure, by providing an insulating film layer formed by a spraying process, the connection stability between the insulating layer and the housing can be improved, and the grooving efficiency of the second groove can be improved.

[0008] In some embodiments, the side plate includes a pair of opposing first side plates and a pair of opposing second side plates. Each second side plate is connected to two first side plates. The surface area of ​​the first side plate is smaller than the surface area of ​​the second side plate, and multiple first grooves are provided on the surface of the first side plate. In the above structure, the pair of first side plates and the pair of second side plates together form an annular closed-loop side plate. The first side plates have a larger area, and the first side plates of two adjacent battery cells are arranged opposite each other. The second side plates have a smaller surface area and are positioned towards the module side plate. Therefore, by providing first grooves on the first side plates and also forming second grooves on the first side plates, the capacity of the adhesive can be increased, improving the structural stability of the battery cell assembly and the positional stability of the battery cells.

[0009] In some embodiments, the first groove has a semi-circular cross-section perpendicular to the thickness direction of the side plate; the second groove also has a semi-circular cross-section perpendicular to the thickness direction of the side plate. In the above structure, the semi-circular cross-section of the second groove increases the contact area between the structural adhesive and the insulating layer, allowing the structural adhesive to better fill the groove and form a stronger mechanical interlocking structure. This improves the bonding strength between the battery cell and the external structure, ensuring that the battery maintains a stable connection under harsh conditions such as vibration and impact.

[0010] In some embodiments, the opening profile formed by the second groove on the outer surface of the insulating layer is circular. In the above structure, the circular opening profile provides a relatively regular and larger opening area compared to some irregular shapes. When bonding the battery cell to the module side panel or housing support plate, more structural adhesive can fill the circular opening, increasing the contact area between the adhesive and the insulating layer, as well as the bonded components. A larger contact area results in stronger intermolecular forces at the bonding interface, thereby improving bonding strength and making the connection between the battery cell and the external structure more secure and reliable, effectively resisting external forces such as vibration and impact.

[0011] In some embodiments, the surface of the base plate opposite to the receiving cavity has multiple spaced third grooves, the inner surface of which is covered by an insulating layer, and a fourth groove corresponding to the third grooves is formed on the surface opposite to the outer shell. The fourth groove is used to accommodate the adhesive. In the above structure, the fourth groove provides a specific space for the adhesive, increasing the contact area between the adhesive and the insulating layer and the housing support plate. The larger the contact area, the stronger the intermolecular forces at the bonding interface, thereby significantly improving the bonding strength between the battery cell and the housing support plate, making the connection more secure and reliable, effectively resisting external forces such as vibration and impact, and ensuring stable operation of the battery under complex operating conditions.

[0012] In some embodiments, the third groove has a semi-circular cross-section perpendicular to the thickness direction of the base plate; the fourth groove also has a corresponding semi-circular cross-section. In the above structure, the semi-circular cross-section of the groove allows the adhesive to fill the groove more fully, significantly increasing the contact area between the adhesive and the insulating layer (forming the fourth groove) and the base plate (with the third groove) compared to planar bonding. This improves the bonding strength between the battery cell and the casing support plate, making the connection more stable and reliable. The semi-circular groove has good symmetry, allowing the adhesive to be distributed more evenly within the groove during filling. This uniform distribution avoids situations where there is too much or too little adhesive in certain areas, ensuring consistent bonding performance at all points of the bonding interface and reducing bonding defects caused by uneven adhesive distribution.

[0013] Secondly, this application provides a battery device including a battery cell, a module side plate, and a connecting portion as described in the above embodiments. The battery cells are arranged sequentially along a first direction to form a battery pack. The module side plate is located on one side of the battery pack along a second direction, which is perpendicular to the first direction. The module side plate has multiple positioning protrusions on the side corresponding to the battery cell, each positioning protrusion engaging with a second groove in the corresponding battery cell. The connecting portion fills the space between the module side plate and the battery cell, with a portion of the connecting portion embedded in the second groove. In the above structure, the multiple positioning protrusions on the module side plate engage with the second groove on the battery cell, providing a precise positioning reference for the installation of the battery cell. During assembly, the operator can quickly place the battery cell along the positioning protrusions into the designated position, enabling the battery cell to be quickly and accurately aligned in both the first and second directions, improving assembly efficiency and reducing assembly time and labor costs. The connecting portion fills the space between the module side plate and the battery cell, and is partially embedded in the second groove; this design increases the contact area and adhesive strength between the connecting portion and the battery cell. The connection part can better withstand various stresses generated by the battery cells during use, such as vibration stress and thermal stress, reducing the risk of loosening and falling off of the connection part, and improving the overall structural reliability and stability of the battery device.

[0014] In some embodiments, the maximum height H1 of the positioning protrusion along the second direction and the maximum depth H2 of the second groove along the second direction, wherein H1 < H2. In the above structure, the connecting portion fills the space between the module side plate and the battery cell, and is partially embedded in the second groove. Since H1 < H2, the connecting portion has more filling space in the second groove, forming a fuller and more secure connection. This makes the connection between the battery cell and the module side plate tighter, enhances the structural stability of the entire battery device, effectively resists external forces such as vibration and impact, and reduces the risk of battery cells loosening or falling off.

[0015] In some embodiments, the positioning protrusion has a semi-circular outline in a cross-section parallel to the second direction and perpendicular to the module side plate. In the above structure, when the semi-circular positioning protrusion mates with the second groove, a larger contact area can be formed. When the connecting portion fills between the two, it can make more sufficient contact with the surfaces of the positioning protrusion and the second groove, thereby enhancing the strength of the connection. When the battery device is subjected to external forces such as vibration and impact, the connection stability between the battery cell and the module side plate can be improved, thereby improving the overall structural stability of the battery device.

[0016] In some embodiments, the battery device further includes a housing, which includes a support plate. The support plate has multiple positioning protrusions on the side facing the battery cell. The bottom plate of the battery cell has a third groove, and an insulating layer covers the inner surface of the third groove. A fourth groove corresponding to the third groove is formed on the surface opposite to the outer casing. The positioning protrusions and the fourth groove are interlocked for positioning. In the above structure, the interlocking of the positioning protrusions and the fourth groove forms a mechanical interlock structure, increasing the connection strength between the battery cell and the support plate. When the battery device is subjected to external forces such as vibration and impact, this mechanical interlock structure can effectively prevent the battery cell from loosening or falling off, ensuring a tight connection between the battery cell and the support plate, thereby enhancing the structural stability of the entire battery device.

[0017] Thirdly, this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0018] 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

[0019] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0020] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0021] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0022] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0023] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0024] Figure 5This is a partial structural diagram of a battery module provided in some embodiments of this application;

[0025] Figure 6 This is a schematic diagram showing the connection between a battery cell and a module side plate provided in some embodiments of this application;

[0026] Figure 7 for Figure 6 A magnified structural diagram of part A in the middle;

[0027] Figure 8 This is a schematic diagram of the left-side structure of a battery cell provided in some embodiments of this application;

[0028] Figure 9 This is a schematic diagram showing the connection between a battery cell and a module side plate provided in other embodiments of this application;

[0029] Figure 10 for Figure 6 A magnified structural diagram of part B in the middle section;

[0030] Figure 11 This is a schematic diagram of the module side panel provided in some embodiments of this application.

[0031] Detailed Explanation of Reference Numerals

[0032] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Accommodation space; 501. Support plate; 6. Battery cell; 10. Electrode terminal; 20. Housing; 201. Side plate; 202. Bottom plate; 203. First groove; 204. First side plate; 205. Second side plate; 30. End cap; 40. Outer shell; 401. First groove; 7. Insulating layer; 701. Second groove; 702. Fourth groove; 8. Battery module; 801. Module side plate; 802. Positioning protrusion; X, First direction; Y, Second direction. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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).

[0039] 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.

[0040] 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.

[0041] 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.

[0042] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 85°-95°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0043] In this application, "multiple" means two or more (including two).

[0044] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a type of battery that can be used again after the battery cell has been discharged by recharging to activate the active materials.

[0045] 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.

[0046] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0051] In a battery assembly, multiple battery cells are arranged sequentially and connected via module end plates and module side plates, then secured with cable ties to form a battery module. The battery cells are bonded to the module side plates using filler adhesive. However, the smooth, flat surface of the battery cells results in relatively weak adhesion to the module side plates, making them susceptible to detachment under vibration or impact. Failure to maintain the connection between the battery cells and the module side plates can lead to displacement, potentially causing short circuits or leakage.

[0052] In view of this, embodiments of this application provide a battery cell including a housing and an insulating layer. A first groove is provided on the side surface of the housing facing the module side plate. The portion of the insulating layer covering the first groove is recessed to form a second groove. The second groove has a certain depth. Compared with the flat surface of the housing, the second groove increases the volume of adhesive, improves the bonding stability of the adhesive, thereby reducing the risk of displacement of the battery cell and improving the operational stability of the battery cell.

[0053] The battery device 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, which are connected in series, parallel, or mixed connections via a busbar.

[0054] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0055] As an example, the battery module can be housed in the housing by fixing it to the housing.

[0056] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0057] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells.

[0058] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0059] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0060] Electrical devices 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 devices.

[0061] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0062] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0063] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0064] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0065] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0066] Figure 2 This is a schematic diagram of a battery explosion provided for some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and battery cells 6, with the battery cells 6 housed within the housing 5. The battery cell 6 can be the smallest unit constituting the battery device 2.

[0067] The housing 5 is used to house the battery cell 6, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell 6. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0068] In the battery device 2, multiple battery cells 6 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 6 are connected in both series and parallel.

[0069] Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed manner, and then the whole composed of multiple battery cells 6 can be housed in the housing 5; of course, multiple battery cells 6 can also be connected in series, parallel, or in a mixed manner to form a battery module, and multiple battery modules can then be connected in series, parallel, or in a mixed manner to form a whole, and housed in the housing 5.

[0070] Please refer to the reference. Figures 2 to 5 , Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application. Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application. Figure 5 This is a partial structural diagram of a battery module provided in some embodiments of this application.

[0071] As shown in the figure, an embodiment of this application provides a battery cell 6, including a housing 40 and an insulating layer 7. The housing 40 has a receiving cavity for accommodating electrode components, and the housing 40 includes an end cap 30 and a shell 20. The shell 20 includes a side plate 201 and a bottom plate 202. The end cap 30 is provided with electrode terminals 10, and the bottom plate 202 is disposed opposite to the end cap 30. The side plate 201 has a plurality of spaced-apart first grooves 401 on its surface opposite to the receiving cavity. The insulating layer 7 covers the surface of the housing 40 opposite to the receiving cavity, covers the groove walls of the first grooves 401, and forms a second groove 701 on the surface opposite to the housing 40, corresponding to the first grooves 401. The second groove 701 is used to accommodate adhesive.

[0072] The outer casing 40 is made of a conductive material with a certain structural strength, such as aluminum alloy or stainless steel. The insulating layer 7 is used to insulate the outer casing 40 of the battery cell 6. Optionally, the casing 20 includes a pair of opposing first side plates 204 and a pair of second side plates 205. The second side plates 205 are respectively connected to the two first side plates 204. The surface area of ​​the first side plates 204 is smaller than the surface area of ​​the second side plates 205. The first side plates 204 of two adjacent battery cells 6 are opposite to each other, and the first side plates 204 face the module side plate 801 of the battery device 2.

[0073] For example, the insulating layer 7 and the housing 40 can be bonded together using structural adhesive, double-sided adhesive, or by spraying or other methods to form the insulating layer 7 on the surface of the housing 40.

[0074] In the technical solution of this application embodiment, the side plate 201 of the housing 20 is provided with a plurality of spaced first grooves 401. This design, while ensuring the overall strength of the housing 40, can disperse the stress borne by the housing 40 through a reasonable groove layout. When the battery cell 6 is subjected to external pressure, collision, or internal pressure changes, the stress can be dispersed and buffered between the grooves, avoiding local stress concentration that could lead to cracking or deformation of the housing 40, thereby improving the structural stability and reliability of the housing 40. For example, the plurality of first grooves 401 are arranged in an array on the surface of the side plate 201 of the housing 20.

[0075] The insulating layer 7 completely covers the surface of the outer casing 40 opposite to the receiving cavity, including the side plate 201, the bottom plate 202, and the groove wall of the first groove 401, achieving all-round insulation protection for the outer casing 40. This effectively prevents short circuits between the electrode components inside the battery cell 6 and the external environment or other conductive parts, ensuring the electrical safety of the battery cell 6. The insulating layer 7 also isolates the outer casing 40 from moisture, oxygen, and other substances in the external environment that may cause electrochemical corrosion, protecting the outer casing 40 from corrosion and extending the service life of the battery cell 6. Especially in harsh operating environments, such as high humidity, high temperature, or environments containing corrosive gases, the insulation and protective functions of the insulating layer 7 are particularly important.

[0076] The design of the second groove 701 provides a space 5c for the adhesive, allowing it to fill evenly. When bonding the battery cell 6 to the module side plate 801, the second groove 701 provides precise positioning, ensuring accurate bonding between the battery cell 6 and the module side plate 801. Simultaneously, the evenly filled adhesive increases the bonding area and improves bonding strength, making the connection between the battery cell 6 and the module side plate 801 more secure and reliable. Since the second groove 701 corresponds to the first groove 401, the adhesive forms a good mechanical interlocking structure with the insulating layer 7 and the outer shell 40 during curing. This structure further enhances the stability of the bond, preventing adhesive detachment or a decrease in bonding strength due to vibration, impact, or other factors during battery use, ensuring a long-term stable connection between the battery cell 6 and the module side plate 801.

[0077] In some embodiments of this application, the insulating layer 7 is an insulating film layer formed on the surface of the housing 40 by a spraying process.

[0078] The spraying process enables the insulating material to adhere evenly to all surfaces of the outer casing 40 in the form of tiny particles, including complex shapes and corners. Whether it's a flat surface, curved surface, or detailed structure such as grooves and protrusions, the insulating film layer completely covers all surfaces of the outer casing 40, eliminating any insulation dead zones. This provides comprehensive and reliable insulation protection for the battery cells 6, effectively preventing short circuits between the electrode components and the external environment or other conductive parts. During the spraying process, physical and chemical adsorption occurs between the insulating material particles and the surface of the outer casing 40, forming a strong adhesion. This adhesion ensures that the insulating film layer is not easily detached or peeled off during use, maintaining good adhesion even when the battery is subjected to vibration, impact, or temperature changes, thus ensuring long-term stable insulation performance.

[0079] Alternatively, the insulating film layer formed by spraying can be used to cover the entire surface of the housing 40, or it can be used on the side surface where the first groove 401 is provided.

[0080] In the above structure, by setting an insulating film layer formed by the spraying process, the connection stability between the insulating layer 7 and the outer shell 40 can be improved, and the grooving efficiency of the second groove 701 can be improved.

[0081] In some embodiments of this application, the side plate 201 includes a pair of opposing first side plates 204 and a pair of opposing second side plates 205. Each second side plate 205 is connected to the two first side plates 204. The surface area of ​​the first side plate 204 is smaller than the surface area of ​​the second side plate 205, and a plurality of first grooves 401 are provided on the surface of the first side plate 204.

[0082] Because multiple first grooves 401 are formed on the surface of the first side plate 204, and second grooves 701 are also formed on the first side plate 204, these grooves increase the accommodating space 5c on the surface of the side plate 201, allowing more adhesive to be accommodated during the assembly of the battery cells 6, thereby increasing the adhesive capacity. More adhesive can better fill the gap between the battery cells 6 and the module side plate 801, making the connection between them tighter and more secure. During battery use, when faced with various external forces such as vibration and impact, the tight connection can effectively reduce the relative displacement between the battery cells 6, enhance the stability of the entire battery assembly structure, and reduce the risk of failure due to structural loosening.

[0083] In the above structure, a pair of first side plates 204 and a pair of second side plates 205 together form an annular closed-loop side plate 201. The first side plate 204 has a larger area, and the first side plates 204 of two adjacent battery cells 6 are arranged opposite each other. The second side plate 205 has a smaller area and is arranged facing the module side plate 801. Therefore, by setting the first groove 401 on the first side plate 204 and the second groove 701 also forming on the first side plate 204, the capacity of the adhesive can be increased, and the structural stability of the battery cell 6 assembly and the positional stability of the battery cell 6 can be improved.

[0084] like Figure 6 as well as Figure 7 As shown, in some embodiments of this application, the first groove 401 has a semi-circular cross-section perpendicular to the thickness direction of the side plate 201. The second groove 701 also has a semi-circular cross-section perpendicular to the thickness direction of the side plate 201.

[0085] In the above structure, the second groove 701 with a semi-circular cross section can increase the contact area between the structural adhesive and the insulating layer 7, allowing the structural adhesive to better fill the groove and form a more robust mechanical interlocking structure, thereby improving the bonding strength between the battery cell 6 and the external structure and ensuring that the battery can maintain a stable connection under harsh conditions such as vibration and impact.

[0086] Optionally, the first groove 401 has a rectangular, trapezoidal, elliptical, or conical cross-section perpendicular to the thickness direction of the side plate 201. The cross-sectional shape of the second groove 701 corresponds to that of the first groove 401. The above structure can be configured as needed.

[0087] like Figure 8 As shown, in some embodiments of this application, the opening profile of the second groove 701 formed on the outer surface of the insulating layer 7 is circular.

[0088] In the above structure, the circular opening provides a relatively regular and larger opening area compared to some irregular shapes. When bonding the battery cell 6 to the module side plate 801 or the housing 5 support plate 501, more structural adhesive can fill the circular opening, increasing the contact area between the adhesive, the insulating layer 7, and the bonded components. The larger the contact area, the stronger the intermolecular forces at the bonding interface, thereby improving the bonding strength and making the connection between the battery cell 6 and the external structure more secure and reliable, effectively resisting external forces such as vibration and impact.

[0089] like Figure 9 As shown, in some embodiments of this application, the bottom plate 202 has a plurality of spaced third grooves on the surface away from the receiving cavity, the insulating layer 7 covers the inner surface of the third grooves, and a fourth groove 702 corresponding to the third grooves is formed on the surface away from the outer shell 40. The fourth groove 702 is used to contain adhesive.

[0090] In the above structure, the fourth groove 702 provides a specific accommodating space 5c for the adhesive, increasing the contact area between the adhesive and the insulating layer 7 and the support plate 501 of the housing 5. The larger the contact area, the stronger the intermolecular forces at the bonding interface, thereby significantly improving the bonding strength between the battery cell 6 and the support plate 501 of the housing 5, making the connection between the two more firm and reliable, effectively resisting external forces such as vibration and impact, and ensuring the stable operation of the battery under complex working conditions.

[0091] In some embodiments of this application, the third groove has a semi-circular cross-section perpendicular to the thickness direction of the base plate 202; the cross-sectional shape of the fourth groove 702 is also semi-circular.

[0092] In the above structure, the semi-circular groove allows the adhesive to fill the groove more fully, significantly increasing the contact area between the adhesive and the insulating layer 7 (forming the fourth groove 702) and the base plate 202 (with the third groove) compared to planar bonding. This improves the bonding strength between the battery cell 6 and the support plate 501 of the casing 5, making the connection more stable and reliable. The semi-circular groove has good symmetry, allowing the adhesive to be distributed more evenly within the groove during filling. This uniform distribution avoids situations where there is too much or too little adhesive in certain areas, ensuring consistent bonding performance at all points of the bonding interface and reducing bonding defects caused by uneven adhesive distribution.

[0093] like Figure 11 As shown, the positioning protrusion 802 is located on the module side plate 801 at the position corresponding to the first groove 401 on the battery cell 6. It can be understood that the positioning protrusion 802 is only provided at the position corresponding to the first groove 401, and the surface of other positions on the module side plate 801 is a planar structure.

[0094] In the above structure, the engagement of the positioning protrusion 802 and the first groove 401 eliminates the need for complex adjustments and alignment during battery cell 6 installation. The operator simply pushes the battery cell 6 along the direction of the positioning protrusion 802, allowing it to smoothly embed into the first groove 401, thus completing the initial positioning. This simplifies the installation process, reduces installation time, and improves overall production efficiency. Furthermore, reducing the number of positioning protrusions 802 decreases the amount of machining work required on the module side plate 801, further increasing production efficiency.

[0095] Please refer to the reference. Figures 2 to 5 This application provides a battery device 2, which includes a battery cell 6, a module side plate 801, and a connecting portion as described in the above embodiments. The battery cells 6 are arranged sequentially along a first direction X to form a battery pack. The module side plate 801 is located on one side of the battery pack along a second direction Y, which is perpendicular to the first direction X. The module side plate 801 has multiple positioning protrusions 802 on the side corresponding to the battery cell 6, each positioning protrusion 802 engaging with a second groove 701 corresponding to the battery cell 6. The connecting portion fills the space between the module side plate 801 and the battery cell 6, and a portion of the connecting portion is embedded within the second groove 701.

[0096] In the above structure, multiple positioning protrusions 802 on the module side plate 801 cooperate with the second groove 701 on the battery cell 6, providing a precise positioning reference for the installation of the battery cell 6. During assembly, the operator can quickly place the battery cell 6 into the designated position along the positioning protrusions 802, ensuring that the battery cell 6 is quickly and accurately aligned in both the first direction X and the second direction Y, improving assembly efficiency and reducing assembly time and labor costs. The connecting part fills the space between the module side plate 801 and the battery cell 6 and is partially embedded in the second groove 701. This design increases the contact area and adhesive strength between the connecting part and the battery cell 6. The connecting part can better withstand various stresses generated by the battery cell 6 during use, such as vibration stress and thermal stress, reducing the risk of loosening and detachment of the connecting part and improving the overall structural reliability and stability of the battery device 2.

[0097] like Figure 10 As shown, in some embodiments of this application, the maximum height H1 of the positioning protrusion 802 protruding along the second direction Y, and the maximum depth H2 of the second groove 701 recessed along the second direction Y, wherein H1 < H2.

[0098] In the above structure, the connecting portion fills the space between the module side plate 801 and the battery cell 6, and is partially embedded in the second groove 701. Since H1 < H2, the connecting portion has more filling space in the second groove 701, forming a fuller and more secure connection. This makes the connection between the battery cell 6 and the module side plate 801 tighter, enhancing the structural stability of the entire battery device 2, effectively resisting external forces such as vibration and impact, and reducing the risk of the battery cell 6 loosening or falling off.

[0099] Furthermore, the depth difference (H2-H1) between the two provides a certain margin of error during the assembly process. In actual assembly, due to manufacturing errors, installation deviations, and other factors, the positions of the battery cell 6 and the module side plate 801 may not be absolutely precise. The design of H1 < H2 ensures that even with a certain deviation, the positioning protrusion 802 can still partially embed into the second groove 701, achieving a basic positioning function and ensuring that the battery cell 6 is approximately aligned in the first direction X and the second direction Y.

[0100] Furthermore, because the connecting part has a thicker filling layer within the second groove 701, it can withstand greater external forces. During normal use of the battery device 2, it needs to bear the weight of the battery cell 6 and various dynamic loads. The design of H1 < H2 allows the connecting part to better bear these loads, ensuring that the connection between the battery cell 6 and the module side plate 801 will not fail due to excessive load.

[0101] In some embodiments of this application, the positioning protrusion 802 has a semi-circular outline in a cross section parallel to the second direction Y and perpendicular to the module side plate 801.

[0102] In the above structure, the semi-circular contoured positioning protrusion 802, when engaging with the second groove 701, forms a larger contact area. This larger contact area also provides a wider adhesion surface for the connecting portion. When the connecting portion fills the space between the positioning protrusion 802 and the second groove 701, it is more evenly distributed on the contact surface, forming a tighter bond with both surfaces. This helps the connecting portion better fulfill its connecting function and enhances the overall connection performance between the positioning protrusion 802, the connecting portion, and the second groove 701.

[0103] When the connecting part is filled between the two, it can make more full contact with the surface of the positioning protrusion 802 and the second groove 701, thereby enhancing the firmness of the connection. When the battery device 2 is subjected to external forces such as vibration and impact, it can improve the connection stability between the battery cell 6 and the module side plate 801, thereby improving the overall structural stability of the battery device 2.

[0104] In some embodiments of this application, the battery device 2 further includes a housing 5, which includes a support plate 501. The support plate 501 has a plurality of positioning protrusions 802 on the side facing the battery cell 6. The bottom plate 202 of the battery cell 6 has a third groove. The insulating layer 7 covers the inner surface of the third groove and forms a fourth groove 702 on the surface opposite to the outer shell 40, which corresponds to the third groove. The positioning protrusions 802 and the fourth groove 702 are mutually engaged and positioned.

[0105] Multiple positioning protrusions 802 on the support plate 501 engage with the fourth groove 702 on the insulation layer 7 of the battery cell 6. This design provides a precise positioning reference for the installation of the battery cell 6 within the housing 5. During batch installation of battery cells 6, operators can quickly and accurately place each battery cell 6 in the designated position, allowing the positioning protrusions 802 to smoothly embed into the fourth groove 702. This avoids repeated adjustments due to positional deviations and greatly improves installation efficiency.

[0106] The engagement of the positioning protrusion 802 and the fourth groove 702 increases the connection points and area between the battery cell 6 and the housing 5, making the connection more robust. When the battery device 2 is subjected to external forces, this strong connection prevents the battery cell 6 from detaching or shifting from the housing 5, improving the overall structural stability of the battery device 2. Multiple battery cells 6 are neatly arranged on the support plate 501 of the housing 5 through the engagement of the positioning protrusion 802 and the fourth groove 702, forming an organic whole. This structure helps improve the overall rigidity of the battery device 2, enabling it to better withstand external loads and deformation, and reducing performance degradation and safety hazards caused by structural loosening.

[0107] Furthermore, the engagement of the positioning protrusion 802 and the fourth groove 702 forms a mechanical interlock structure, increasing the connection strength between the battery cell 6 and the support plate 501. When the battery device 2 is subjected to external forces such as vibration and impact, this mechanical interlock structure can effectively prevent the battery cell 6 from loosening or falling off, ensuring a tight connection between the battery cell 6 and the support plate 501, thereby enhancing the structural stability of the entire battery device 2.

[0108] In some alternative embodiments, the battery device 2 includes a housing 5, battery cells 6, a module plate, and a connecting portion. The battery cell 6 includes a housing 40 and an insulating layer 7. The housing 40 has a receiving cavity for accommodating electrode assemblies and includes an end cap 30 and a shell 20. The shell 20 includes a side plate 201 and a bottom plate 202. The end cap 30 is provided with electrode terminals 10, and the bottom plate 202 is disposed opposite to the end cap 30. The side plate 201 has a plurality of spaced-apart first grooves 401 on its surface opposite to the receiving cavity. The insulating layer 7 covers the surface of the housing 40 opposite to the receiving cavity, covers the groove walls of the first grooves 401, and forms a second groove 701 corresponding to the first groove 401 on its surface opposite to the housing 40. The second groove 701 is used to accommodate adhesive. The module plate includes a module end plate and a module side plate 801. A plurality of battery cells 6 are stacked along a first direction X between two module end plates. The module side plate 801 is connected to the two module end plates and is located on one side of the battery pack along the second direction Y, which is perpendicular to the first direction X. The module side plate 801 has multiple positioning protrusions 802 on the side corresponding to the battery cell 6, and each positioning protrusion 802 engages with the second groove 701 of the corresponding battery cell 6. A connecting portion fills the space between the module side plate 801 and the battery cell 6, and part of the connecting portion is embedded in the second groove 701. The housing 5 includes a support plate 501, which has multiple positioning protrusions 802 on the side facing the battery cell 6. The bottom plate 202 of the battery cell 6 has a third groove, and an insulating layer 7 covers the inner surface of the third groove. A fourth groove 702 corresponding to the third groove is formed on the surface opposite to the outer casing 40. The positioning protrusions 802 and the fourth groove 702 are mutually engaged and positioned.

[0109] The embodiments of this application provide an electrical device that includes the battery device 2 described in the above embodiments. The battery device 2 is used to provide electrical energy. The electrical device includes all the technical features of the battery device 2 described above, and therefore also has the above-described technical effects, which will not be elaborated further here.

[0110] 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 housing has a receiving cavity for accommodating electrode assemblies. The housing includes an end cap and a shell. The shell includes a side plate and a bottom plate. The end cap is provided with electrode terminals. The bottom plate is disposed opposite to the end cap. The side plate has a plurality of spaced-apart first grooves on its surface opposite to the receiving cavity. An insulating layer covers the side surface of the housing facing away from the receiving cavity. The insulating layer covers the groove wall of the first groove and forms a second groove on the surface facing away from the housing, corresponding to the first groove. The second groove is used to contain adhesive.

2. The battery cell according to claim 1, characterized in that, The insulating layer is an insulating film layer formed on the surface of the outer casing by a spraying process.

3. The battery cell according to claim 1 or 2, characterized in that, The side plate includes: A pair of first side panels, positioned opposite each other; A pair of second side plates are arranged opposite to each other, with each second side plate connected to one of the two first side plates respectively. The surface area of ​​the first side plate is smaller than that of the second side plate, and a plurality of the first grooves are provided on the surface of the first side plate.

4. The battery cell according to claim 1 or 2, characterized in that, The first groove has a semi-circular cross-section perpendicular to the thickness direction of the side plate; the second groove has a corresponding semi-circular cross-section perpendicular to the thickness direction of the side plate.

5. The battery cell according to claim 4, characterized in that, The opening profile formed by the second groove on the outer surface of the insulating layer is circular.

6. The battery cell according to claim 1 or 2, characterized in that, The base plate has a plurality of spaced third grooves on the surface away from the receiving cavity. The insulating layer covers the inner surface of the third grooves and forms a fourth groove on the surface away from the outer shell, which corresponds to the third grooves. The fourth groove is used to accommodate adhesive.

7. The battery cell according to claim 6, characterized in that, The third groove has a semi-circular cross-section perpendicular to the thickness direction of the base plate; the fourth groove has a corresponding semi-circular cross-section.

8. A battery device, characterized in that, include: Multiple battery cells as described in any one of claims 1-7 are arranged sequentially along a first direction to form a battery pack; A module side plate is provided on one side of the battery pack along a second direction, the second direction being perpendicular to the first direction. The module side plate has multiple positioning protrusions on the side corresponding to the battery cell, and each positioning protrusion cooperates with the second groove corresponding to the battery cell. A connecting portion is filled between the module side plate and the battery cell, and a portion of the connecting portion is embedded in the second groove.

9. The battery device according to claim 8, characterized in that, The maximum height H1 of the positioning protrusion along the second direction, and the maximum depth H2 of the second groove along the second direction, wherein H1 < H2.

10. The battery device according to claim 8, characterized in that, The positioning protrusion has a semi-circular outline in a cross-section parallel to the second direction and perpendicular to the module side plate.

11. The battery device according to claim 8, characterized in that, The battery device also includes a housing, which includes a support plate. The support plate has multiple positioning protrusions on the side facing the battery cell. The bottom plate of the battery cell has a third groove. The insulating layer covers the inner surface of the third groove and forms a fourth groove on the surface opposite to the outer shell, which corresponds to the third groove. The positioning protrusions and the fourth groove are interlocked and positioned with each other.

12. An electrical appliance, characterized in that, The electrical equipment includes a battery device as described in any one of claims 8-11, the battery device being used to provide electrical energy.

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