Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly, an insulating part and a bottom supporting plate, the electrode assembly is arranged in the shell; the insulating part is located in the shell and comprises a bottom wall and side walls, the bottom wall is located on one side of the electrode assembly in the first direction, and a first gap is formed between part of the side walls and the bottom wall; the bottom supporting plate is arranged between the bottom wall and the electrode assembly, at least one side, in the first direction, of the bottom supporting plate is provided with a concave part, and at least part of the concave part extends to the first gap and is communicated with the first gap. The electrolyte can flow to the bottom supporting plate through the first gap, so that the wettability between the electrolyte and the electrode assembly is improved, and the reliability of the battery monomer is further improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and power supply device. Background Technology

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

[0003] As batteries are used in a wider range of applications, the reliability of individual battery cells needs to be improved. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, including: a housing, an electrode assembly, an insulating member, and a bottom support plate; the electrode assembly is disposed within the housing; the insulating member is located within the housing, and the insulating member includes a bottom wall and a side wall, the bottom wall being located on one side of the electrode assembly in a first direction, and a first gap being formed between a portion of the side wall and the bottom wall; the bottom support plate is disposed between the bottom wall and the electrode assembly, and the bottom support plate has a recess on at least one side along the first direction, at least a portion of the recess extending to and communicating with the first gap.

[0006] In this embodiment, a first gap is provided between a portion of the sidewall and the bottom wall. The electrolyte between the insulating component and the housing can flow to the bottom support plate through the first gap. At least one side of the bottom support plate along the first direction is provided with a recess, and at least a portion of the recess extends to and communicates with the first gap, so that the electrolyte can flow to the recess through the first gap. When the recess is located on the side of the bottom support plate facing the electrode assembly, it can increase the contact area between the electrode liquid and the electrode assembly. When the recess is located on the side of the bottom support plate away from the electrode assembly, it can increase the content of electrolyte in the insulating component, improve the wettability between the electrolyte and the electrode assembly, and thus improve the reliability of the battery cell.

[0007] According to an embodiment of this application, the sidewall includes two first sidewalls, which are disposed on the bottom wall facing the electrode assembly, and the two first sidewalls are spaced apart along a second direction; wherein, a first gap exists between the first sidewall and the bottom wall, and a recess extends along the second direction and penetrates at least one end of the bottom support plate, the recess being used for electrolyte flow, and the first and second directions intersect. The recess extends along the second direction and penetrates at least one end of the bottom support plate in the second direction, so that the electrolyte passing through the first gap can directly enter the recess, increasing the electrolyte content in the insulating component and improving the wettability between the electrolyte and the electrode assembly.

[0008] According to an embodiment of this application, the base plate includes multiple recesses arranged side-by-side along a third direction, with the first direction, second direction, and third direction intersecting each other. Each recess extends along the second direction, and the multiple recesses are arranged side-by-side along the third direction, reducing the influence of each recess on the length of the second direction, thereby increasing the extension length of the recesses along the second direction and improving the wettability between the electrode assembly and the electrolyte.

[0009] According to an embodiment of this application, the base plate includes a first through hole located in a recess, the first through hole penetrating the base plate along a first direction. Electrode fluid on the side of the base plate away from the electrode assembly can flow through the first through hole to the side of the base plate facing the electrode assembly, improving the wettability between the electrode assembly and the electrolyte.

[0010] According to the embodiments of this application, each recess is provided with a plurality of first through holes, which are arranged side by side along a second direction. The recess extends along the second direction, and the plurality of first through holes are disposed in the recess and are arranged side by side at intervals along the second direction. The recess is connected to the plurality of first through holes, and the electrolyte flows in the recess along the second direction and through each of the first through holes, thereby improving the uniformity of the electrode liquid in the base plate in the second direction.

[0011] According to embodiments of this application, the recess is located on the side of the base plate facing the electrode assembly, or the recess is located on the side of the base plate away from the electrode assembly, and a first through hole is provided in the recess, the first through hole penetrating the base plate along a first direction. The recess being located on the side of the base plate facing the electrode assembly increases the contact area between the electrode liquid and the electrode assembly. The recess being located on the side of the base plate away from the electrode assembly, with the first through hole, allows the electrolyte to flow through the first through hole to the side of the base plate facing the electrode assembly when the electrolyte flows to the recess, thereby increasing the contact area between the electrolyte and the electrode assembly.

[0012] According to an embodiment of this application, the first sidewall includes two side plates that overlap along a second direction and have a second gap between them. A first gap exists between the side plates and the bottom wall, allowing electrolyte located between the insulating member and the housing to enter the side of the insulating member facing the electrode assembly through the first and second gaps. A recess extends through at least one end of the bottom support plate along the second direction to facilitate electrolyte entry into the recess.

[0013] According to embodiments of this application, the base plate further includes at least two positioning holes. These positioning holes penetrate the base plate along a first direction and communicate with the recess. The positioning holes are used to position the base plate on the bottom wall. The positioning holes are also used to position the relative position between the base plate and the insulating component. The fact that the positioning holes penetrate the base plate along the first direction and communicate with the recess facilitates the flow of electrolyte from the side of the base plate away from the electrode assembly to the side of the base plate facing the electrode assembly. The communication between the positioning holes and the recess facilitates the flow of electrode fluid in the recess and electrolyte in the positioning holes.

[0014] Secondly, this application provides a battery device including a battery cell according to any embodiment of the first aspect.

[0015] Thirdly, this application provides an electrical device, including the battery device in the second aspect embodiment. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0017] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0018] Figure 2 Exploded view of the battery device according to some embodiments of this application;

[0019] Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application;

[0020] Figure 4 This is a schematic diagram of the exploded structure of a battery cell according to some embodiments of this application;

[0021] Figure 5 This is a schematic diagram of the structure of a battery cell according to some embodiments of this application;

[0022] Figure 6 for Figure 5 Enlarged view of a portion of region B in the middle;

[0023] Figure 7 This is a schematic diagram of the structure of the base plate in some embodiments of this application;

[0024] Figure 8 This is a schematic diagram of the structure of the base plate in some other embodiments of this application;

[0025] Figure 9This is a schematic diagram of the structure of the base plate in some embodiments of this application.

[0026] Figure label:

[0027] 1. Vehicles;

[0028] 10. Battery assembly; 11. Battery cell; 20. Control system; 30. Motor; 40. Housing; 41. First housing section; 42. Second housing section; 43. Receiving section; 50. Battery module;

[0029] 100, Housing; 101, Opening; 110, Top cover assembly; 200, Electrode assembly; 300, Insulator; 310, Bottom wall; 320, Side wall; 321, First side wall; 321a, Side plate; 322, First gap; 323, Second gap; 324, Second side wall; 400, Bottom support plate; 410, Recess; 420, First through hole; 430, Positioning hole;

[0030] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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).

[0037] 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.

[0038] 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.

[0039] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0040] 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.

[0041] 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.

[0042] A single battery cell includes electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector includes a positive current-collecting section and a positive electrode tab connected to it. The current-collecting section is coated with the positive active material layer, while the tab is not. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section. The negative current collection section is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, which can be carbon or silicon, etc.

[0043] The housing may contain one or more electrode assemblies, which are mainly formed by winding or stacking electrode sheets. During the charging and discharging process of the battery, the positive and negative active material layers react with the electrolyte, and the tabs connect the electrode terminals to form a current loop. The housing is a component used to cooperate with the top cover assembly to form the internal environment of the battery cell. The formed internal environment can accommodate the electrode assemblies, electrolyte, and other components. The housing and top cover assembly can be independent components. An opening can be provided on the housing, and the top cover assembly closes the opening to form the internal environment of the battery cell. Optionally, the top cover assembly and housing can be integrated. Optionally, the top cover assembly and housing can form a common connection surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing, the top cover assembly closes the housing. The housing can be made of various materials, including copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0044] In related technologies, in a battery cell, an insulating component is disposed inside the casing and located between the electrode assembly and the casing, which serves to insulate the electrode assembly from the casing. If the insulating component is too close to the electrode assembly, it will affect the wettability between the electrolyte and the electrode assembly, thereby affecting the reliability of the battery cell.

[0045] Based on the above-mentioned technical problems, this application provides a technical solution. The insulating component includes a bottom wall and a side wall. The bottom wall is located on one side of the electrode assembly in a first direction, and a first gap is formed between a portion of the side wall and the bottom wall. A bottom support plate is disposed between the bottom wall and the electrode assembly. The bottom support plate has a recess on at least one side along the first direction. At least a portion of the recess extends to and communicates with the first gap, thereby allowing the electrolyte to enter the recess of the bottom support plate through the first gap, increasing the electrolyte capacity between the insulating component and the electrode assembly, and improving the wettability between the electrolyte and the electrode assembly.

[0046] 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.

[0047] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0048] 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.

[0049] 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.

[0050] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0051] 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.

[0052] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0053] The technical solutions described in this application are applicable to battery devices and electrical devices using battery devices. Electrical devices include, for example, mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft. Electric toys include, for example, stationary or mobile electric toys, specifically, game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include, for example, metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, specifically, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0054] The battery cells described in this application are not limited to the electrical devices described above, but for the sake of brevity, the following embodiments are all illustrated using electric vehicles as an example.

[0055] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0056] Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 can be installed inside vehicle 1, specifically, for example, at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1; for example, it can serve as the operating power source for vehicle 1. Vehicle 1 may also include a control system 20 and a motor 30. The control system 20, for example, controls the battery device to supply power to the motor 30. The battery device can be used for starting and navigation of vehicle 1. Of course, the battery device 10 can also be used to drive vehicle 1, replacing or partially replacing gasoline or natural gas as the driving force for vehicle 1.

[0057] Figure 2 This is an exploded structural diagram of a battery device provided in an embodiment of this application. Figure 2 As shown, the battery device 10 includes a housing 40 and battery cells (not shown in the figure), with the battery cells housed within the housing 40.

[0058] The housing 40 is used to house individual battery cells, and the housing 40 can have various structures. In some embodiments, the housing 40 may include a first housing portion 41 and a second housing portion 42, which overlap each other, and together define a receiving portion 43 for housing the individual battery cells. The second housing portion 42 may be a hollow structure with one end open, and the first housing portion 41 may be a plate-like structure, with the first housing portion 41 covering the open side of the second housing portion 42 to form a housing with the receiving portion 43; alternatively, both the first housing portion 41 and the second housing portion 42 may be hollow structures with one side open, with the open side of the first housing portion 41 covering the open side of the second housing portion 42 to form a housing 40 with the receiving portion 43. Of course, the first housing portion 41 and the second housing portion 42 can have various shapes, such as cylinders, cuboids, etc.

[0059] In the battery device 10, there can be multiple battery cells. These multiple battery cells can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or in a mixed configuration and then housed within the housing 40. Alternatively, multiple battery cells can first be connected in series, parallel, or in a mixed configuration to form a battery module 50, and then multiple battery modules 50 can be connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing 40.

[0060] Figure 3 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application.

[0061] In some embodiments, such as Figure 3 As shown, there are multiple battery cells 11, which are first connected in series, parallel, or in a mixed manner to form a battery module 50. The multiple battery modules 50 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing.

[0062] Firstly, such as Figures 4 to 6 As shown, this application proposes a battery cell 11, including: a housing 100, an electrode assembly 200, an insulating member 300, and a bottom support plate 400; the electrode assembly 200 is disposed within the housing 100; the insulating member 300 is located within the housing 100, and the insulating member 300 includes a bottom wall 310 and a side wall 320, the bottom wall 310 is located on one side of the electrode assembly 200 in a first direction X, and a first gap 322 is formed between a portion of the side wall 320 and the bottom wall 310; the bottom support plate 400 is disposed between the bottom wall 310 and the electrode assembly 200, and a recess 410 is provided on at least one side of the bottom support plate 400 along the first direction X, and at least a portion of the recess 410 extends to and communicates with the first gap 322.

[0063] For example, the recess 410 is provided on the side of the base plate 400 facing the electrode assembly 200 along the first direction X, or the recess 410 is provided on the side of the base plate 400 away from the electrode assembly 200 along the first direction X, or the recess 410 is provided on both the side of the base plate 400 facing the electrode assembly 200 and the side away from the electrode assembly 200 along the first direction X.

[0064] For example, at least a portion of the recess 410 extends to and communicates with the first gap 322. This can be either the recess 410 being connected to the first gap 322, or the recess 410 and the first gap 322 being spaced apart.

[0065] In this embodiment, the battery cell 11 includes a housing 100 and an electrode assembly 200, which is located within the housing 100 and undergoes an electrochemical reaction. An insulating member 300 is disposed within the housing 100 and includes a bottom wall 310 and a side wall 320. The bottom wall 310 is located on one side of the electrode assembly 200 in the first direction X, providing insulation between the electrode assembly 200 and the housing 100. A bottom support plate 400 is disposed between the bottom wall 310 and the electrode assembly 200, providing support for the electrode assembly 200. A first gap 322 is provided between a portion of the sidewall 320 and the bottom wall 310. The electrolyte between the insulating component 300 and the housing 100 can flow through the first gap 322 to the bottom support plate 400. The bottom support plate 400 is provided with a recess 410 on at least one side along the first direction X. At least a portion of the recess 410 extends to and communicates with the first gap 322, so that the electrolyte can flow through the first gap 322 to the recess 410. When the recess 410 is located on the side of the bottom support plate 400 facing the electrode assembly 200, it can increase the contact area between the electrode liquid and the electrode assembly 200. When the recess 410 is located on the side of the bottom support plate 400 away from the electrode assembly 200, it can increase the content of electrolyte in the insulating component 300, improve the wettability between the electrolyte and the electrode assembly 200, and thus improve the reliability of the battery cell 11.

[0066] Optional, such as Figures 4 to 6 As shown, the housing 100 includes an opening 101 on one side in the first direction X, and a top cover assembly 110 covers the opening 101 to close the electrode assembly 200 inside the housing 100. The bottom wall 310 is located on the side of the electrode assembly 200 away from the top cover assembly 110 along the first direction X.

[0067] like Figures 4 to 6As shown, in some optional embodiments, the sidewall 320 includes two first sidewalls 321, which are disposed on the bottom wall 310 facing the electrode assembly 200, and the two first sidewalls 321 are spaced apart along the second direction Y; wherein, there is a first gap 322 between the first sidewall 321 and the bottom wall 310, and the recess 410 extends along the second direction Y and penetrates at least one end of the bottom support plate 400, the recess 410 is used for the flow of electrolyte, and the first direction X and the second direction Y intersect.

[0068] For example, the recess 410 extending along the second direction Y and penetrating at least one end of the base plate 400 can be either one end of the recess 410 extending along the second direction Y and penetrating the base plate 400 in the second direction Y, or the recess 410 extending along the second direction Y and penetrating both ends of the base plate 400 in the second direction Y.

[0069] For example, a portion of the recess 410 extends along the second direction Y and penetrates one end of the base plate 400 in the second direction Y, while another portion of the recess 410 extends along the second direction Y and penetrates the other end of the base plate 400 in the second direction Y.

[0070] In these optional embodiments, a first sidewall 321 is disposed on the bottom wall 310 facing the electrode assembly 200. The first sidewall 321 is located between the housing 100 and the electrode assembly 200. The first sidewall 321 serves to insulate the electrode assembly 200 from the housing 100. Two first sidewalls 321 are spaced apart along the second direction Y and are respectively located on both sides of the electrode assembly 200 along the second direction Y. A first gap 322 is formed between the first sidewall 321 and the bottom wall 310. The recess 410 extends along the second direction Y and penetrates at least one end of the bottom support plate 400 in the second direction Y, so that the electrolyte passing through the first gap 322 can directly enter the recess 410, increasing the electrolyte content in the insulating member 300 and improving the wettability between the electrolyte and the electrode assembly 200.

[0071] Optional, such as Figure 4 As shown, the sidewall 320 includes two second sidewalls 324, which are disposed on the bottom wall 310 facing the electrode assembly 200. The two second sidewalls 324 are spaced apart along the third direction Z. Two first sidewalls 321 are connected between the two second sidewalls 324. The bottom wall 310, the first sidewalls 321, and the second sidewalls 324 enclose a receiving space for accommodating the electrode assembly 200. The first direction X, the second direction Y, and the third direction Z intersect each other.

[0072] like Figure 7 As shown, in some optional embodiments, the base plate 400 includes a plurality of recesses 410 arranged side by side along a third direction Z, wherein the first direction X, the second direction Y and the third direction Z intersect each other.

[0073] In these alternative embodiments, each recess 410 extends along the second direction Y, and multiple recesses 410 are arranged side by side along the third direction Z, reducing the influence of each recess 410 on the length of the second direction Y, thereby increasing the extension length of the recess 410 along the second direction Y and improving the wettability between the electrode assembly 200 and the electrolyte.

[0074] like Figure 8 As shown, in some optional embodiments, the base plate 400 includes a first through hole 420 located in the recess 410, the first through hole 420 penetrating the base plate 400 along a first direction X.

[0075] For example, the first through hole 420 can be disposed inside the recess 410 or outside the recess 410.

[0076] In these alternative embodiments, the first through hole 420 extends through the base plate 400 along the first direction X, thereby allowing the electrode liquid on the side of the base plate 400 away from the electrode assembly 200 to flow through the first through hole 420 to the side of the base plate 400 facing the electrode assembly 200, thereby improving the wettability between the electrode assembly 200 and the electrolyte.

[0077] like Figure 8 As shown, in some optional embodiments, each recess 410 is provided with a plurality of first through holes 420, and the plurality of first through holes 420 are arranged side by side along the second direction Y.

[0078] In these alternative embodiments, the recess 410 extends along the second direction Y, and a plurality of first through holes 420 are disposed in the recess 410. The plurality of first through holes 420 are arranged side by side and spaced apart along the second direction Y. The recess 410 connects to the plurality of first through holes 420. Electrolyte flows in the recess 410 along the second direction Y and flows through each of the first through holes 420, thereby improving the uniformity of the electrode liquid on the bottom plate 400 in the second direction Y.

[0079] like Figure 8 As shown, in some alternative embodiments, the recess 410 is located on the side of the base plate 400 facing the electrode assembly 200.

[0080] In these alternative embodiments, the electrolyte can flow through the recess 410, which is located on the side of the base plate 400 facing the electrode assembly 200, increasing the contact area between the electrode liquid and the electrode assembly 200 and improving the wettability between the electrode assembly 200 and the electrolyte.

[0081] like Figure 5 and Figure 6As shown, in some alternative embodiments, the recess 410 is located on the side of the base plate 400 away from the electrode assembly 200, and a first through hole 420 is provided in the recess 410, which penetrates the base plate 400 along the first direction X.

[0082] In these alternative embodiments, the recess 410 is located on the side of the base plate 400 away from the electrode assembly 200, and a first through hole 420 is provided on the recess 410. When the electrolyte flows to the recess 410, the electrolyte can flow through the first through hole 420 to the side of the base plate 400 facing the electrode assembly 200, thereby increasing the contact area between the electrolyte and the electrode assembly 200.

[0083] like Figure 4 As shown, in some optional embodiments, the first sidewall 321 includes two side plates 321a, which are arranged to overlap along the second direction Y, and a second gap 323 is provided between the two side plates 321a.

[0084] In these alternative embodiments, each first sidewall 321 includes two side plates 321a, which are overlapped and have a second gap 323. A first gap 322 is provided between the side plate 321a and the bottom wall 310. Electrolyte located between the insulating member 300 and the housing 100 can enter the side of the insulating member 300 facing the electrode assembly 200 through the first gap 322 and the second gap 323. The recess 410 penetrates at least one end of the bottom support plate 400 along the second direction Y to facilitate the entry of electrolyte into the recess 410.

[0085] Optional, such as Figure 4 As shown, the battery cell 11 includes at least two electrode assemblies 200 arranged side by side along the third direction Z. The two ends of the electrode assembly 200 along the second direction Y are arc-shaped surfaces, and the arc-shaped surfaces are spaced apart from the side plate 321a so that the electrolyte can flow into the space between the arc-shaped surfaces and the side plate 321a through the second gap 323.

[0086] like Figure 7 and Figure 8 As shown, in some optional embodiments, the base plate 400 further includes at least two positioning holes 430, which penetrate the base plate 400 along the first direction X and are connected to the recess 410. The positioning holes 430 are used to position the base plate 400 on the bottom wall 310.

[0087] In these optional embodiments, during the assembly of the base plate 400 and the insulating member 300, the positioning hole 430 is used to position the relative position between the base plate 400 and the insulating member 300. The positioning hole 430 penetrates the base plate 400 along a first direction X and communicates with the recess 410, thereby facilitating the entry of electrolyte from the side of the base plate 400 away from the electrode assembly 200 into the side of the base plate 400 facing the electrode assembly 200 through the positioning hole 430. The communication between the positioning hole 430 and the recess 410 facilitates the mutual flow between the electrode liquid in the recess 410 and the electrolyte in the positioning hole 430.

[0088] Optional, such as Figure 9 As shown, the diameter of the positioning hole 430 is the same as that of the first through hole 420, so that the positioning hole 430 and the first through hole 420 can be formed simultaneously in the same process step, which is beneficial to improving the preparation efficiency of the battery cell 11.

[0089] Secondly, this application provides a battery device 10, including the battery cell 11 in any of the embodiments of the first aspect described above.

[0090] The battery device 10 provided in the embodiments of this application has all the beneficial effects of the battery cell 11 in any of the embodiments of the first aspect due to the use of the battery cell 11 provided in the first aspect. For details, please refer to the specific description of the battery cell 11 in the above embodiments. This embodiment will not repeat the description here.

[0091] Thirdly, this application also provides an electrical device, including the battery device 10 in any of the embodiments of the second aspect above, the battery device 10 being used to store or provide electrical energy.

[0092] In some optional embodiments, the battery cell 11 includes: a housing 100, an electrode assembly 200, an insulating member 300, and a bottom support plate 400; the electrode assembly 200 is disposed within the housing 100; the insulating member 300 is located within the housing 100, and the insulating member 300 includes a bottom wall 310 and two first side walls 321. The bottom wall 310 is located on one side of the electrode assembly 200 in the first direction X, and the two first side walls 321 are respectively located on both sides of the electrode assembly 200 along the second direction Y. A first gap 322 is formed between the first side wall 321 and the bottom wall 310. The first side wall 321 includes two side plates 321a, which are overlapped along the second direction Y, and a second gap 323 is formed between the two side plates 321a. A base plate 400 is disposed between the bottom wall 310 and the electrode assembly 200. Multiple recesses 410 are provided on one side of the base plate 400 along the first direction X. The recesses 410 extend along the second direction Y and penetrate both ends of the base plate 400, communicating with the first gap 322. The multiple recesses 410 are arranged side-by-side along the third direction Z. The recesses 410 are located on the side of the base plate 400 facing the electrode assembly 200. Alternatively, the recesses 410 are located on the side of the base plate 400 away from the electrode assembly 200, and multiple first through holes 420 are provided within the recesses 410. The multiple first through holes 420 are arranged side-by-side along the second direction Y, and the first through holes 420 penetrate the base plate 400 along the first direction X.

[0093] 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: case; Electrode assembly, disposed within the housing; An insulating element is located within the housing. The insulating element includes a bottom wall and a side wall. The bottom wall is located on one side of the electrode assembly in a first direction, and a first gap is formed between a portion of the side wall and the bottom wall. A base plate is disposed between the bottom wall and the electrode assembly. The base plate has a recess on at least one side along the first direction, and at least a portion of the recess extends into and communicates with the first gap.

2. The battery cell according to claim 1, characterized in that, The sidewall includes two first sidewalls, which are disposed on the bottom wall facing the electrode assembly, and the two first sidewalls are spaced apart along a second direction; The first sidewall and the bottom wall have the first gap, the recess extends along the second direction and penetrates at least one end of the bottom plate, the recess is used for the flow of electrolyte, and the first direction and the second direction intersect.

3. The battery cell according to claim 2, characterized in that, The base plate includes multiple recesses, which are arranged side by side along a third direction, with the first direction, the second direction, and the third direction intersecting each other.

4. The battery cell according to claim 3, characterized in that, The base plate includes a first through hole located in the recess, the first through hole penetrating the base plate along the first direction.

5. The battery cell according to claim 4, characterized in that, Each of the recesses is provided with a plurality of first through holes, and the plurality of first through holes are arranged side by side along the second direction.

6. The battery cell according to claim 1, characterized in that, The recess is located on the side of the base plate facing the electrode assembly, or the recess is located on the side of the base plate away from the electrode assembly, and a first through hole is provided in the recess, the first through hole penetrating the base plate along the first direction.

7. The battery cell according to claim 2, characterized in that, The first sidewall includes two side plates, which are overlapped along the second direction and have a second gap between them.

8. The battery cell according to any one of claims 1-7, characterized in that, The base plate also includes at least two positioning holes, which penetrate the base plate along the first direction and are connected to the recess. The positioning holes are used to position the base plate on the bottom wall.

9. A battery device, characterized in that, Includes the battery cell described in any one of claims 1-8.

10. An electrical appliance, characterized in that, Includes the battery device as described in claim 9.

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