Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment. The battery monomer comprises a shell, an electrode assembly, an insulating layer and a supporting plate, the housing includes a first wall, and the electrode assembly is disposed within the housing. The insulating layer is arranged between the electrode assembly and the shell, and a first through hole is formed in the surface, facing the first wall, of the insulating layer. The supporting plate is arranged between the first wall and the insulating layer and used for supporting the electrode assembly, and a second through hole is formed in the supporting plate. Grooves are formed in the surface, facing the insulating layer, of the supporting plate, and the grooves and the second through holes are formed in the supporting plate at intervals. According to the technical scheme, the operation stability of the single battery can be improved.

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] The development of battery technology must take into account multiple design factors. Improving the stability of a single battery cell during operation is a research direction in the battery field. 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 stability of battery cell operation.

[0005] In a first aspect, this application provides a battery cell, including a casing, an electrode assembly, an insulating layer, and a support plate. The casing includes a first wall, and the electrode assembly is disposed within the casing. The insulating layer is disposed between the electrode assembly and the casing, and a first through hole is provided on the surface of the insulating layer facing the first wall. The support plate is disposed between the first wall and the insulating layer for supporting the electrode assembly, and a second through hole is provided on the support plate. A groove is provided on the surface of the support plate facing the insulating layer, and the groove and the second through hole are spaced apart on the support plate.

[0006] In the technical solution of this application embodiment, a housing is provided to offer a favorable environment for the electrode assembly, reducing the impact of external impurities and moisture on its operation. The insulating layer increases the creepage distance between the electrode assembly and the housing, improving their insulation performance. A first through-hole is provided in the insulating layer, allowing the electrolyte to enter the interior of the electrode assembly and achieve good wetting. The support plate provides structural support for the electrode assembly, reducing displacement or damage during operation. A second through-hole is provided on the support plate, allowing the electrolyte to flow into the electrode assembly, further improving the wetting performance between the electrode assembly and the electrolyte. Furthermore, grooves are provided on the support plate to accommodate a portion of the electrolyte and promote capillary movement, enhancing the wetting performance of the electrode assembly.

[0007] In some embodiments, the orthographic projections of the first through hole and the second through hole on the first wall are spaced apart. In the above structure, the staggered arrangement of the first and second through holes can increase the creepage distance between the electrode assembly and the housing, and improve the insulation performance of the support plate.

[0008] In some embodiments, the orthographic projection of the first through-hole onto the support plate at least partially overlaps with the groove. In the above structure, by correspondingly aligning the first through-hole with the groove, the electrolyte in the groove can flow through the first through-hole to the electrolysis assembly, thereby improving the flow performance of the electrolyte.

[0009] In some embodiments, there are multiple grooves, which are spaced apart along a first direction perpendicular to the thickness direction of the battery cell. In the above structure, by providing multiple grooves, the electrolyte storage capacity is increased, and the electrolyte wetting performance is improved. Arranging multiple grooves along the first direction allows for effective wetting of all parts of the electrode assembly, improving the uniformity of wetting.

[0010] In some embodiments, a second through-hole is disposed between two adjacent grooves. In the above structure, the second through-hole can guide the electrolyte at the bottom of the support plate into the groove, thereby improving the flow efficiency of the electrolyte.

[0011] In some embodiments, the support plate has a first positioning hole, and the insulating layer has a second positioning hole, with the first positioning hole and the second positioning hole being coaxially arranged. In the above structure, by providing the first positioning hole and the second positioning hole, the installation efficiency and installation position accuracy of the support plate can be improved.

[0012] In some embodiments, the diameter D of the second through hole is: 0.2mm ≤ D ≤ 20mm. In the above structure, increasing the diameter of the second through hole by more than 0.2mm facilitates the absorption of electrolyte by the second through hole and improves the efficiency of electrolyte flow. Setting the diameter of the second through hole within 20mm reduces the space occupied by the second through hole and ensures the structural strength of the support plate.

[0013] In some embodiments, the minimum distance L between the orthographic projection of the first through hole on the support plate and the second through hole is 0.5 mm ≤ L. In the above structure, by increasing the misalignment distance between the first and second through holes, the creepage distance between the housing and the electrode assembly can be increased, thereby improving insulation safety.

[0014] In some embodiments, the thickness of the support plate is T, and the maximum inward dimension of the groove along the thickness direction of the support plate is H, where 0.25*T≤H≤0.75*T. In the above structure, by limiting the depth of the groove to 0.75 times the thickness of the support plate, the overall structural stability of the support plate can be ensured. By setting the groove depth to be greater than 0.25 times the thickness of the support plate, the capacity of the electrolyte in the groove can be increased, ensuring the flow rate of the electrolyte.

[0015] In some embodiments, the maximum dimension W of the groove along the first direction is 0.2mm ≤ W ≤ 20mm, and the minimum distance Y between the second through hole and the groove is 0.5mm ≤ Y. In the above structure, by setting a reasonable groove width, the flow efficiency of the electrolyte can be ensured while maintaining the structural stability of the support plate. The certain distance between the second through hole and the groove ensures the stability of the electrolyte flow within the groove, while simultaneously increasing the creepage distance between the electrode assembly and the outer casing, thus improving insulation performance.

[0016] Secondly, this application provides a battery device that includes the battery cell described in the above embodiments.

[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, specific embodiments of this application are given below. 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 Explosion-proof diagrams of battery devices provided in some embodiments of this application;

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

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

[0024] Figure 5 This is a schematic diagram of the structure of the support plate provided in some embodiments of this application;

[0025] Figure 6 This is a schematic diagram of the structure of the support plate provided in some other embodiments of this application;

[0026] Figure 7 Schematic diagram of the structure of the support plate provided in some embodiments of this application;

[0027] Figure 8 This is a schematic diagram of the structure of a support plate provided in some embodiments of this application.

[0028] Detailed Explanation of Reference Numerals

[0029] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Accommodation space; 6. Battery cell; 10. Electrode assembly; 20. Housing; 25. Electrode terminal; 30. End cap; 40. Outer shell; 401. First wall; 50. Insulating layer; 501. First through hole; 502. Second positioning hole; 60. Support plate; 601. Second through hole; 602. Groove; 603. First positioning hole; X. First direction; Z. Thickness direction. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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).

[0036] 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.

[0037] 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.

[0038] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0039] 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.

[0040] 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.

[0041] In this application, "multiple" means two or more (including two).

[0042] 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.

[0043] 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.

[0044] 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.

[0045] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0046] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0047] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0048] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0049] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0050] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0051] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0052] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0053] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0054] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements.

[0055] Liquid electrolytes include electrolyte salts and solvents.

[0056] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0057] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0058] In some implementations, the electrode assembly is a stacked structure.

[0059] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0060] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0061] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0062] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0063] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0064] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0065] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0071] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0072] 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. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0073] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0074] 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.

[0075] 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.

[0076] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0077] In the structure of a battery cell, an insulating component is installed outside the electrode assembly, and a bottom support plate is usually installed at the bottom to support the electrode assembly. During the electrolyte filling process of the battery cell, under the action of gravity, the electrode assembly squeezes the bottom insulating layer with the bottom support plate, causing the electrolyte to be unable to quickly enter the interior of the electrode assembly. This results in poor electrolyte wetting at the bottom of the electrode assembly, reducing wetting efficiency and thus slowing down the production cycle.

[0078] Therefore, embodiments of this application provide a battery cell with a casing that provides a favorable environment for the electrode assembly, reducing the impact of external impurities and moisture on the operation of the electrode assembly. An insulating layer increases the creepage distance between the electrode assembly and the casing, improving the insulation performance between them. A first through-hole is provided in the insulating layer, allowing electrolyte to enter the interior of the electrode assembly and achieve good wetting. A support plate provides structural support for the electrode assembly, reducing displacement or damage during operation. A second through-hole is provided on the support plate, allowing electrolyte to flow to the electrode assembly, improving the wetting performance between the electrode assembly and the electrolyte. Furthermore, grooves are provided on the support plate to accommodate some electrolyte and promote capillary movement of the electrolyte, further enhancing the wetting performance of the electrode assembly and improving efficiency.

[0079] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0080] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0081] like Figure 1 As shown, a battery 2 is installed inside the vehicle 1. The battery 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.

[0082] 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.

[0083] 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.

[0084] 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 that makes up a battery.

[0085] 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.

[0086] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0087] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0088] In the battery device 2, there can be one or more battery cells 6. If there are multiple battery cells 6, they 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.

[0089] 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.

[0090] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application.

[0091] like Figure 3 As shown, in some embodiments, the battery cell 6 includes a housing 40 and an electrode assembly 10 housed within the housing 40.

[0092] The electrode assembly 10 includes a positive electrode and a negative electrode. During the charging and discharging process of the battery cell 6, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. Optionally, the electrode assembly 10 also includes a separator disposed between the positive and negative electrodes, which can reduce the risk of short circuit between the positive and negative electrodes while allowing active ions to pass through.

[0093] The housing 40 is used to encapsulate the electrode assembly 10 and electrolyte components. The housing 40 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite housing 40), or aluminum-plastic film, etc.

[0094] In some embodiments, the housing 40 includes a housing 20 and an end cap 30, the housing 20 having an opening and the end cap 30 for closing the opening.

[0095] In some embodiments, the battery cell 6 further includes an electrolyte housed within the casing 40. The electrolyte acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid.

[0096] In some embodiments, the battery cell 6 includes electrode terminals 25. The electrode terminals 25 are electrically connected to the electrode assembly 10 for outputting or inputting electrical energy into the battery cell 6.

[0097] Please refer to the reference. Figures 3 to 5 , Figure 3 This is an exploded schematic diagram of a single battery cell provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of the insulating layer provided in some embodiments of this application. Figure 5This is a schematic diagram of the structure of a support plate provided in some embodiments of this application.

[0098] As shown in the figure, the battery cell 6 provided in this embodiment includes a housing 40, an electrode assembly 10, an insulating layer 50, and a support plate 60. The housing 40 includes a first wall 401, and the electrode assembly 10 is disposed inside the housing 40. The insulating layer 50 is disposed between the electrode assembly 10 and the housing 40, and a first through hole 501 is provided on the surface of the insulating layer 50 facing the first wall 401. The support plate 60 is disposed between the first wall 401 and the insulating layer 50 to support the electrode assembly 10, and a second through hole 601 is provided on the support plate 60. A groove 602 is provided on the surface of the support plate 60 facing the insulating layer 50, and the groove 602 and the second through hole 601 are spaced apart on the support plate 60.

[0099] Optionally, the first wall 401 of the housing 40 can be a bottom wall, which is located at the bottom of the battery cell 6 along the direction of gravity. The end cap 30 of the housing 40 can be disposed opposite to the first wall 401.

[0100] For example, the insulating layer 50 is an insulating material with a certain elasticity that covers the electrode assembly 10. The materials that can be used for the insulating blue film mainly include polyethylene terephthalate, polypropylene, polyethylene, etc. The first through hole 501 on the insulating layer 50 can be a circular through hole. Optionally, there are multiple first through holes 501, and the multiple first through holes 501 are evenly spaced on the side of the insulating layer 50 facing the first wall 401.

[0101] The support plate 60 can be made of an insulating material with a certain strength, such as polypropylene, epoxy resin, polycarbonate, and EVA foam. The second through hole 601 on the support plate 60 can be a circular through hole or a through hole of other shapes. There can be multiple second through holes 601, evenly spaced on the support plate 60. The groove 602 is a recessed structure formed on the surface of the support plate 60. It can hold a certain amount of electrolyte. The groove 602 and the second through hole 601 are spaced apart on the support plate 60, meaning that the groove 602 and the second through hole 601 are staggered but not interconnected.

[0102] In the technical solution of this application embodiment, the outer shell 40 provides a good environment for the electrode assembly 10, reducing the impact of external impurities and moisture on the operation of the electrode assembly 10. The insulating layer 50 increases the creepage distance between the electrode assembly 10 and the outer shell 40, improving the insulation performance between the electrode assembly 10 and the outer shell 40. A first through hole 501 is provided on the insulating layer 50, allowing the electrolyte to enter the interior of the electrode assembly 10 through the first through hole 501, forming good wetting of the electrode assembly 10. The support plate 60 can provide structural support for the electrode assembly 10, reducing the displacement or damage of the electrode assembly 10 during operation. A second through hole 601 is provided on the support plate 60, allowing the electrolyte to flow to the electrode assembly 10 through the second through hole 601, improving the wetting performance between the electrode assembly 10 and the electrolyte. Furthermore, a groove 602 is provided on the support plate 60, which can accommodate part of the electrolyte and promote the capillary movement of the electrolyte, improving the wetting performance of the electrode assembly.

[0103] like Figure 6 As shown, in some embodiments of this application, the orthographic projection of the first through hole 501 on the first wall 401 and the orthographic projection of the second through hole 601 on the first wall 401 are spaced apart.

[0104] Creepage distance refers to the shortest distance along the surface of a solid insulating material between two conductive parts. Under the influence of an electric field, charges move on the insulating surface; this phenomenon is called "creepage" or "surface discharge." Increasing the creepage distance reduces the risk of charges moving on the insulating surface, thereby improving insulation performance. By staggering the first through-hole 501 and the second through-hole 601, the insulation path between the electrode assembly 10 and the housing 40 can be made more complex and lengthy, thus increasing the creepage distance. The increased creepage distance means that it takes longer for charges to move on the insulating surface, reducing the possibility of charge accumulation and the formation of corona or electric sparks, thereby improving the insulation performance of the support plate 60.

[0105] The staggered through holes can also enhance the structural stability of the support plate 60 to a certain extent, making it more able to withstand the pressure from the electrode assembly 10 and the housing 40.

[0106] In the above structure, the first through hole 501 and the second through hole 601 are staggered, which can increase the creepage distance between the electrode assembly 10 and the housing 40 and improve the insulation performance of the support plate 60.

[0107] In some embodiments of this application, the orthographic projection of the first through hole 501 on the support plate 60 at least partially overlaps with the groove 602.

[0108] By aligning the first through-hole 501 with the groove 602, the electrolyte can flow more smoothly from the groove 602 through the first through-hole 501 to the electrode assembly 10. This design reduces resistance to electrolyte flow and improves its flow efficiency.

[0109] The design of the groove 602 helps to accommodate part of the electrolyte and promotes its flow through capillary action. When the electrolyte enters the groove 602, its shape and size design create a certain liquid level within the groove. As more electrolyte is injected, the liquid level gradually rises and flows into the electrode assembly 10 through the first through-hole 501. This capillary action not only helps to ensure uniform distribution of the electrolyte but also improves its wetting properties.

[0110] Due to the corresponding arrangement of the groove 602 and the first through hole 501, the electrolyte can more fully wet the electrode assembly 10. This helps to improve the battery's capacity and cycle performance, because sufficient electrolyte wetting ensures that the active materials in the electrode material are fully utilized.

[0111] In the above structure, by correspondingly setting the first through hole 501 with the groove 602, the electrolyte in the groove 602 can flow to the electrolysis component through the first through hole 501, thereby improving the flow performance of the electrolyte.

[0112] like Figure 5 As shown, in some embodiments of this application, there are multiple grooves 602, which are spaced apart along a first direction X, perpendicular to the thickness direction Z of the battery cell 6. For example, the first direction X is the width direction of the battery cell 6.

[0113] The design of multiple grooves 602 increases the storage space for electrolyte around the electrode assembly 10. When electrolyte is injected into the battery cell 6, some of the electrolyte is stored in these grooves 602. In this way, even if the amount of electrolyte decreases due to changes in external conditions (such as temperature fluctuations or electrolyte consumption during battery use), the electrolyte in the grooves 602 can be replenished to ensure that the electrode assembly 10 is always adequately wetted with electrolyte.

[0114] By arranging multiple grooves 602 at intervals along the first direction X, more uniform wetting of the electrolyte on the electrode assembly 10 can be ensured. Because the grooves 602 are evenly distributed around the electrode assembly 10, the electrolyte can more easily reach all areas during flow, avoiding uneven wetting caused by insufficient electrolyte in certain areas. This uniform wetting helps extend the battery's lifespan, as the electrode material in each area is fully utilized and protected.

[0115] In the above structure, by providing multiple grooves 602, the electrolyte storage capacity is increased and the electrolyte wetting performance is improved. Arranging the multiple grooves 602 along the first direction X ensures effective wetting of all parts of the electrode assembly 10, improving the uniformity of wetting.

[0116] In some embodiments of this application, the second through hole 601 is disposed between two adjacent grooves 602.

[0117] Due to the guiding effect of the second through-hole 601, the electrolyte can reach all parts of the electrode assembly 10 more quickly, thereby reducing the wetting time. This improves the battery production efficiency and shortens the charging time. The second through-hole 601 not only improves the flow efficiency of the electrolyte but also helps to improve the uniformity of wetting. By rationally designing the position and number of the second through-hole 601, it can be ensured that the electrolyte is more evenly distributed on the electrode assembly 10, avoiding performance degradation caused by insufficient electrolyte in certain areas.

[0118] In the above structure, the second through hole 601 can guide the electrolyte at the bottom of the support plate 60 into the groove 602, thereby improving the flow efficiency of the electrolyte.

[0119] In some embodiments of this application, the support plate 60 is provided with a first positioning hole 603, and the insulating layer 50 is provided with a second positioning hole 502. The first positioning hole 603 and the second positioning hole 502 are coaxially arranged.

[0120] The coaxial arrangement of the first positioning hole 603 and the second positioning hole 502 allows for quick alignment of the support plate 60 and the insulation layer 50 during installation. This alignment method is not only simple and quick, but also reduces installation errors and rework time caused by improper alignment. The coaxial arrangement of the first positioning hole 603 and the second positioning hole 502 ensures that the support plate 60 and the insulation layer 50 maintain a high degree of coaxiality during installation.

[0121] In the above structure, by setting the first positioning hole 603 and the second positioning hole 502, the installation efficiency and installation position accuracy of the support plate 60 can be improved.

[0122] like Figure 6As shown, in some embodiments of this application, the diameter D of the second through hole 601 is: 0.2mm ≤ D ≤ 20mm. For example, the diameter D of the second through hole 601 is: 0.2mm, 0.5mm, 0.8mm, 1.0mm, 2.0mm, 3.0mm, 5.0mm, 8.0mm, 9.0mm, 10.0mm, 12.0mm, 12.5mm, 13.0mm, 15.0mm, 15.5mm, 16.0mm, 16.5mm, 17.0mm, 17.5mm, 18.0mm, 19.0mm, 19.5mm.

[0123] When the diameter of the second through-hole 601 increases to 0.2 mm or more, its surface area also increases, allowing for more effective absorption and containment of the electrolyte. This helps to accelerate the flow rate of the electrolyte and improve the uniformity of electrolyte distribution inside the battery. A larger diameter of the second through-hole 601 reduces the resistance to electrolyte flow, allowing the electrolyte to pass more smoothly through the support plate 60 and wet the electrode assembly 10. This helps to improve the battery's charge-discharge performance and cycle life. Limiting the diameter of the second through-hole 601 to within 20 mm ensures that the support plate 60 has sufficient strength and stability when subjected to internal battery pressure and external impacts.

[0124] In the above structure, increasing the diameter of the second through hole 601 by more than 0.2 mm facilitates the absorption of electrolyte by the second through hole 601 and improves the efficiency of electrolyte flow. Setting the diameter of the second through hole 601 within 20 mm reduces the space occupied by the second through hole 601 and ensures the structural strength of the support plate 60.

[0125] In some optional embodiments, the diameter D' of the first through hole 501 is: 0.2mm ≤ D' ≤ 20mm. For example, the diameter D' of the first through hole 501 is: 0.2mm, 0.5mm, 0.8mm, 1.0mm, 2.0mm, 3.0mm, 5.0mm, 8.0mm, 9.0mm, 10.0mm, 12.0mm, 12.5mm, 13.0mm, 15.0mm, 15.5mm, 16.0mm, 16.5mm, 17.0mm, 17.5mm, 18.0mm, 19.0mm, 19.5mm.

[0126] In some embodiments of this application, the minimum distance L between the orthographic projection of the first through hole 501 on the support plate 60 and the second through hole 601 is: 0.5mm≤L.

[0127] For example, both the first through hole 501 and the second through hole 601 are circular holes. The minimum distance L between the orthographic projection of the first through hole 501 on the support plate 60 and the second through hole 601 is the minimum distance between the center of the orthographic projection of the first through hole 501 and the center of the second through hole 601. The minimum distance L between the orthographic projection of the first through hole 501 on the support plate 60 and the second through hole 601 is 0.5mm, 0.6mm, 0.7mm, 0.8mm, 1.0mm, 1.2mm, 1.3mm, 1.5mm, and 2.0mm.

[0128] Increasing the creepage distance L reduces the likelihood of electrolyte or other conductive media penetrating between the casing 40 and the electrode assembly 10 through tiny gaps or cracks. This helps maintain electrical isolation within the battery, preventing short circuits and malfunctions. The increased creepage distance and enhanced insulation contribute to improved battery reliability and durability. Even when subjected to external factors such as vibration, shock, or temperature changes during long-term use, the battery maintains stable electrical performance.

[0129] In the above structure, by increasing the misalignment distance between the first through hole 501 and the second through hole 601, the creepage distance between the housing 40 and the electrode assembly 10 can be increased, thereby improving insulation safety.

[0130] like Figure 7 As shown, in some embodiments of this application, the thickness of the support plate 60 is T, and the maximum size of the groove 602 that is recessed inward along the thickness direction Z of the support plate 60 is H, where 0.25*T≤H≤0.75*T.

[0131] Limiting the maximum inward dimension H of the groove 602 along the thickness Z direction of the support plate 60 to within 0.75 times the thickness T of the support plate 60 ensures that the support plate 60 has sufficient strength and stability when subjected to internal battery pressure and external impact. The structural stability of the support plate 60 is crucial to battery safety. A structurally stable support plate 60 can better support and protect the electrode assembly 10 and other critical components inside the battery, preventing safety accidents such as short circuits, leaks, or explosions caused by structural failure.

[0132] By setting the depth of the groove 602 to be greater than 0.25 times the thickness T of the support plate 60, it can be ensured that the groove 602 has sufficient volume to hold the electrolyte. This helps to increase the amount of electrolyte inside the battery, improving the battery's charge-discharge performance and cycle life. An appropriate groove 602 depth can also optimize the electrolyte's flow path and velocity. Smoother electrolyte flow within the groove 602 helps reduce flow resistance and energy loss, improving the overall efficiency of the battery.

[0133] In the above structure, by limiting the depth of the groove 602 to 0.75 times the thickness of the support plate 60, the overall structural stability of the support plate 60 can be ensured. By setting the depth of the groove 602 to be greater than 0.25 times the thickness of the support plate 60, the capacity of the electrolyte in the groove 602 can be increased, ensuring the flow rate of the electrolyte.

[0134] like Figure 8 As shown, in some embodiments of this application, the maximum dimension W of the groove 602 along the first direction X is: 0.2mm≤W≤20mm, and the minimum distance Y between the second through hole 601 and the groove 602 is: 0.5mm≤Y.

[0135] The width W of the groove 602 directly affects the flow path and velocity of the electrolyte. An excessively narrow groove 602 may restrict electrolyte flow, leading to increased flow resistance and affecting the battery's charge / discharge performance. A suitable groove 602 width ensures smooth electrolyte flow within the groove, improving flow efficiency and thus optimizing battery performance.

[0136] The second through-hole 601 is typically used for electrolyte injection or drainage in the battery. Maintaining a certain distance Y from the groove 602 ensures that the electrolyte flow within the groove 602 is not disturbed by the through-hole, thus maintaining flow stability. Stable electrolyte flow helps maintain a uniform distribution of electrolyte inside the battery, improving the battery's charge / discharge efficiency and cycle life.

[0137] In the above structure, by setting a reasonable width dimension of the groove 602, the flow efficiency of the electrolyte can be ensured while maintaining the structural stability of the support plate 60. The second through hole 601 is spaced a certain distance from the groove 602, which can ensure the flow stability of the electrolyte in the groove 602, while increasing the creepage distance between the electrode assembly 10 and the outer shell 40 and improving the insulation performance.

[0138] In some alternative embodiments, the battery cell 6 includes a housing 40, an electrode assembly 10, an insulating layer 50, and a support plate 60. The housing 40 includes a first wall 401, and the electrode assembly 10 is disposed within the housing 40. The insulating layer 50 is disposed between the electrode assembly 10 and the housing 40, and a first through-hole 501 is provided on the surface of the insulating layer 50 facing the first wall 401. The support plate 60 is disposed between the first wall 401 and the insulating layer 50 to support the electrode assembly 10, and a second through-hole 601 is provided on the support plate 60. A groove 602 is provided on the surface of the support plate 60 facing the insulating layer 50, and the groove 602 and the second through-hole 601 are spaced apart on the support plate 60. The orthographic projection of the first through-hole 501 on the first wall 401 and the orthographic projection of the second through-hole 601 on the first wall 401 are spaced apart. The orthographic projection of the first through-hole 501 on the support plate 60 overlaps with the groove 602. There are multiple grooves 602, which are spaced apart along a first direction X, perpendicular to the thickness direction Z of the battery cell 6. A second through hole 601 is provided between two adjacent grooves 602. The support plate 60 is provided with a first positioning hole 603, and the insulating layer 50 is provided with a second positioning hole 502, which are coaxially arranged.

[0139] This application provides a battery device 2, which includes the battery cell 6 described in the above embodiments. This application also provides an electrical device, which includes the battery device 2 described in the above embodiments, and the battery device 2 is used to provide electrical energy. A housing 40 provides a good environment for the electrode assembly 10, reducing the impact of external impurities and moisture on the operation of the electrode assembly 10. An insulating layer 50 increases the creepage distance between the electrode assembly 10 and the housing 40, improving the insulation performance between them. A first through-hole 501 is provided on the insulating layer 50, allowing electrolyte to enter the interior of the electrode assembly 10 and form good wetting of the electrode assembly 10. A support plate 60 provides structural support for the electrode assembly 10, reducing displacement or damage during operation. A second through-hole 601 is provided on the support plate 60, allowing electrolyte to flow to the electrode assembly 10, improving the wetting performance between the electrode assembly 10 and the electrolyte. Furthermore, the support plate 60 is provided with a groove 602, which can accommodate part of the electrolyte and promote the capillary movement of the electrolyte, thereby improving the wetting performance of the electrode assembly.

[0140] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell comprising a first wall; an electrode assembly arranged in the shell; an insulation layer arranged between the electrode assembly and the shell, the insulation layer being provided with a first through hole on a surface thereof facing the first wall; a support plate arranged between the first wall and the insulation layer for supporting the electrode assembly, the support plate being provided with a second through hole, the support plate being provided with a groove on a surface thereof facing the insulation layer, the groove and the second through hole being arranged on the support plate in a spaced manner.

2. The battery cell of claim 1, wherein, A normal projection of the first through hole on the first wall and a normal projection of the second through hole on the first wall are arranged in a spaced manner.

3. The battery cell of claim 2, wherein, A normal projection of the first through hole on the support plate and the groove at least partially overlap.

4. The battery cell of any one of claims 1-3, wherein, The groove is in a plurality, and the plurality of grooves are arranged in a spaced manner along a first direction, the first direction being perpendicular to a thickness direction of the battery monomer.

5. The battery cell of claim 4, wherein, The second through hole is arranged between two adjacent grooves.

6. The battery cell of claim 5, wherein, The support plate is provided with a first positioning hole, and the insulation layer is provided with a second positioning hole, the first positioning hole and the second positioning hole being arranged in a coaxial manner.

7. The battery cell of claim 4, wherein, A diameter D of the second through hole is: 0.2mm≤D≤20mm.

8. The battery cell of claim 7, wherein, A minimum distance L between the normal projection of the first through hole on the support plate and the second through hole is: 0.5mm≤L.

9. The battery cell of claim 8, wherein, A thickness of the support plate is T, a maximum size H of the groove recessed in a thickness direction of the support plate is: 0.25*T≤H≤0.75*T.

10. The battery cell of claim 9, wherein, A maximum size W of the groove along the first direction is: 0.2mm≤W≤20mm, and a minimum distance Y between the second through hole and the groove is: 0.5mm≤Y.

11. A battery device characterized by comprising: The battery device comprises the battery monomer as claimed in any one of claims 1-10.

12. An electrical device, characterized by The electrical equipment comprises the battery device as claimed in claim 11, and the battery device is used for providing electrical energy.

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