Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device, and relates to the technical field of batteries, and the battery device comprises a battery monomer and an isolation plate. The battery cell includes a housing and a terminal assembly. The shell comprises a first wall, and the terminal assembly is arranged on the first wall. The isolation plate comprises a main body part and a sealing part, the main body part is provided with a first through hole, and at least part of the terminal assembly is located in the first through hole; and the sealing part is arranged along the circumferential direction of the first through hole and is connected with the main body part, and the sealing part seals a gap between the hole wall of the first through hole and the terminal assembly. According to the battery device provided by the embodiment of the invention, the sealing part is arranged at the circumferential position of the first through hole and seals the gap between the hole wall of the first through hole and the terminal assembly, so that the phenomenon that particulate matters of an assembly part or particulate matters generated by an assembly process fall into the gap in a subsequent assembly process can be reduced, and the sealing performance of the battery device is improved. Therefore, the reliability of the final battery device is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, battery reliability is an issue that cannot be ignored. If the reliability of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to enhance the reliability of the battery is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] The present application provides a battery device and an electrical device, which can improve the reliability of the battery.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a battery device, which includes a battery cell and an isolation plate. The battery cell includes a housing and a terminal assembly. The housing includes a first wall, and the terminal assembly is arranged on the first wall. The isolation plate includes a main body and a sealing part, the main body is provided with a first through hole, and at least part of the terminal assembly is located in the first through hole; the sealing part is arranged along the circumference of the first through hole and connected to the main body, and the sealing part seals the gap between the hole wall of the first through hole and the terminal assembly.

[0007] In the above embodiment, the sealing portion is arranged at a circumferential position of the first through hole, and the gap between the hole wall of the first through hole and the terminal assembly is sealed, which can reduce the short circuit between the terminal assembly and the shell caused by the particles of the assembly parts themselves or the particles generated by the assembly process falling into the gap during the subsequent assembly process, thereby improving the reliability of the final battery device. Exemplarily, in the subsequent assembly process of the battery cell and other assembly parts, the particles on the other assembly parts may detach from the assembly parts and fall into the gap between the hole wall of the first through hole and the terminal assembly. In some scenarios, in the subsequent process, when the battery cell and the busbar are assembled, the welding particles that may be generated during the welding process of the terminal assembly of the battery cell and the busbar will fall into the gap between the hole wall of the first through hole and the terminal assembly. When the technical solution in the embodiment of the present application is adopted, the occurrence of the above situation can be reduced, and the reliability of the final battery device can be improved.

[0008] In some embodiments, the hardness of the sealing portion is less than the hardness of the main body portion. The sealing portion and the main body portion are connected to each other, and the hardness of the sealing portion can be set to be less than the hardness of the main body portion. This setting enables the sealing portion to deform at the position of the first through hole during the assembly of the isolation plate with the terminal assembly, thereby achieving the purpose of sealing the gap between the hole wall of the first through hole and the terminal assembly.

[0009] In some embodiments, the sealing part is made of flexible plastic and the main body is made of hard plastic. When the main body is made of hard plastic, it can provide better support for other components, and is convenient for carrying other assembly components, connecting wire harnesses, etc. during the subsequent assembly process. When the sealing part is made of flexible plastic, the sealing part is more likely to deform during the assembly process of the main body and the terminal assembly, thereby sealing the gap between the hole wall of the first through hole and the terminal assembly.

[0010] In some embodiments, the outer peripheral surface of the sealing portion is connected to the hole wall of the first through hole. The sealing portion is connected to the hole wall of the first through hole, and the sealing portion pre-completes the closed assembly of the first through hole. When the terminal assembly is subsequently assembled with the main body, the sealing portion will follow the main body in the assembly process to seal the gap between the hole wall of the first through hole and the terminal assembly, which can achieve a better assembly effect.

[0011] In some of the embodiments, the hole wall of the first through hole is formed with a first step surface, and the outer peripheral surface of the sealing portion is formed with a second step surface; along the thickness direction of the first wall, the first step surface and the second step surface are arranged opposite to each other and connected to each other. In the above embodiment, the hole wall of the first through hole and the outer peripheral surface of the sealing portion are formed with the first step surface and the second step surface that are matched and connected to each other, which can increase the connection area between the sealing portion and the main body, thereby improving the connection reliability between the two.

[0012] In some embodiments, the first step surface formed on the hole wall of the first through hole is arranged toward the first wall, and the second step surface formed on the outer peripheral surface of the sealing part is arranged away from the first wall, so that the main body can press a part of the sealing part between the main body and the shell. During the assembly process of the isolation plate and the battery cell, at least part of the terminal assembly of the battery cell will pass through the first through hole formed on the main body. When the sealing part is connected to the hole wall of the first through hole, the terminal assembly will contact the sealing part during the process of passing through the first through hole, and apply a force to the sealing part that is away from the battery cell. At this time, the arrangement in the above embodiment is adopted, that is, the first step surface and the second step surface face each other, and the second step surface faces away from the first wall. When the terminal assembly applies a force to the sealing part that is away from the battery cell shell, the main body can apply a force in the opposite direction to the sealing part to improve the connection reliability between the main body and the sealing part.

[0013] In some embodiments, the sealing part and the main body are integrally injection molded. Integral injection molding can reduce the assembly process and provide better connection reliability.

[0014] In some of the embodiments, the sealing part is bonded or hot-melted to the main body. The sealing part and the main body are connected by bonding or hot-melting.

[0015] In some embodiments, the sealing part is interference-fitted with the terminal assembly, the sealing part is connected to the hole wall of the first through hole, and then during the assembly process of the main body and the battery cell, the sealing part is deformed to fill and seal the gap between the hole wall of the first through hole and the terminal assembly.

[0016] In some embodiments, the battery device further includes a busbar. The busbar is disposed on a side of the isolation plate facing away from the first wall. The terminal assembly includes an electrode terminal. During the assembly of the terminal assembly and the busbar, the electrode terminal passes through the first through hole and is connected to the busbar. The battery device is formed by connecting multiple battery cells through the busbar to be applied to different usage scenarios.

[0017] In some embodiments, the current collector and the isolation plate are integrally formed. In this embodiment, the current collector and the isolation plate are integrally provided to form an isolation plate assembly, which is used to connect multiple battery cells in the battery device and to provide insulation, thereby improving assembly convenience.

[0018] In some embodiments, the terminal assembly includes an electrode terminal, an insulating member and a connecting member. The insulating member is configured to insulate the electrode terminal from the housing. The connecting member is at least partially disposed on the periphery of the electrode terminal, the electrode terminal is connected to the first wall through the connecting member, and the insulating member is at least partially disposed between the electrode terminal and the connecting member. Through this arrangement, the terminal assembly can be fixed relative to the housing, thereby making the terminal assembly have better reliability relative to the housing.

[0019] In some embodiments, the sealing portion seals the gap between the hole wall of the first through hole and the insulating member. In this embodiment, the sealing portion abuts against the hole wall of the first through hole, which can reduce the probability of particles dropped during subsequent assembly contacting the housing, thereby reducing the situation where the insulation of the housing is affected.

[0020] In some other embodiments, along the thickness direction of the first wall, the insulating member has a first surface facing the busbar, the electrode terminal has a first convex portion protruding from the first surface, and the first convex portion is connected to the busbar. The sealing portion seals the gap between the first through hole and the first convex portion. Through this arrangement, in the subsequent assembly process, the probability of possible falling particles contacting the insulating member can be reduced, and the insulation between the electrode terminal and the housing can be further improved.

[0021] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device according to any one of the above embodiments.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0025] Figure 2 A schematic diagram of the exploded structure of a battery device according to some embodiments of the present application;

[0026] Figure 3 A top view of a battery device provided for some embodiments of the present application;

[0027] Figure 4 for Figure 3 BB cross-sectional view;

[0028] Figure 5 for Figure 4 A local enlarged view at point A;

[0029] Figure 6 A schematic diagram of the structure of a battery device provided in some other embodiments of the present application;

[0030] Figure 7 A schematic diagram of the structure of a battery device provided in some other embodiments of the present application;

[0031] Figure 8 A schematic diagram of the structure of a battery device provided in some other embodiments of the present application;

[0032] Fig. 9 for Figure 8 A top view of

[0033] Fig.10 for Fig. 9 AA section view;

[0034] Fig.11 for Fig.10 A local enlarged view at point B;

[0035] icon:

[0036] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, housing; 11, first sub-housing; 12, second sub-housing; 20, battery cell; 201, housing; 2011, first wall; 202, terminal assembly; 2021, electrode terminal; 20211, first protrusion; 2022, insulating member; 2023, connector; 30, isolation plate; 301, main body; 3011, first through hole; 3012, first step surface; 302, sealing portion; 3021, second step surface; 40, busbar; 50, adapter. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0039] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0042] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in hybrid connection through a busbar.

[0043] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0044] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0045] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0046] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0047] As an example, the box may include a first sub-box and a second sub-box. The first sub-box and the second sub-box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first sub-box can be a top cover or a bottom plate.

[0048] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0049] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the bottom plate of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0050] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0051] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0052] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0053] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the short circuit between the positive and negative electrodes, while allowing the active ions to pass through.

[0054] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet 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.

[0055] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0056] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with surface silver plating may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0057] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0058] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0059] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used.

[0060] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0061] As an example, the negative electrode active material may adopt the negative electrode active material for battery devices known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0062] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical reliability and mechanical reliability can be selected.

[0063] 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 special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0064] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0065] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0066] In some embodiments, the electrode assembly is a laminate structure.

[0067] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0068] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0069] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through an adapter. The electrode terminal may be disposed on the end cap, or may be disposed on the housing.

[0070] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0071] In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing may protect the electrode assembly and reduce leakage of electrolyte. When the housing is a non-sealed structure, the housing may protect the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly, the sealing bag being used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film.

[0072] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0073] In the process of assembling battery cells to form a battery device, it is necessary to use an isolation plate to insulate multiple battery cells and to carry and place the connecting harness. Usually, a first through hole is provided on the isolation plate. During the assembly of the battery device, the terminal assembly of the battery cell will pass through the first through hole and at least partially be located in the first through hole. In order to facilitate the terminal assembly to pass through the first through hole during the assembly process, the setting of the first through hole will inevitably produce assembly tolerances, and therefore, when the terminal assembly is at least partially located in the first through hole, a gap will be formed between the terminal assembly and the hole wall of the first through hole. Because of the existence of this gap, in other subsequent assembly processes, particles falling from other assembly parts, or particles generated by the assembly process, these particles may fall into the gap, and these particles falling into the gap may directly cause the terminal assembly to short-circuit with the shell if they are conductive. Even if non-conductive particles fall into the gap, the insulating layer provided on the shell may be scratched due to the movement of the particles, resulting in a situation that affects the insulation of the terminal assembly and the shell, thereby destroying the insulation requirements of the battery cell itself, resulting in a decrease in the reliability of the final battery device.

[0074] Based on the above situation, some embodiments of the present application provide a battery device and an electrical device, wherein a sealing portion is provided between the first through hole wall and the terminal assembly, and the sealing portion can seal the gap between the first through hole wall and the terminal assembly. This setting can effectively reduce the situation in which particles fall into the gap between the first through hole wall and the terminal assembly during the subsequent assembly process, affecting the insulation between the terminal assembly and the housing, thereby improving the reliability of the final battery device.

[0075] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The battery device disclosed in the present application can be used to form a power supply system of the electrical equipment.

[0076] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0077] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0078] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used for powering the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0079] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0080] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0081] Please refer to Figure 2 , Figure 2 A schematic diagram of the structure of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first sub-box 11 and a second sub-box 12, and the first sub-box 11 and the second sub-box 12 cover each other, and the first sub-box 11 and the second sub-box 12 jointly define a storage space for accommodating the battery cell 20. The second sub-box 12 can be a hollow structure with one end open, and the first sub-box 11 can be a plate-like structure. The first sub-box 11 covers the open side of the second sub-box 12, so that the first sub-box 11 and the second sub-box 12 jointly define a storage space; the first sub-box 11 and the second sub-box 12 can also be hollow structures with one side open, and the open side of the first sub-box 11 covers the open side of the second sub-box 12.

[0082] In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery device 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0083] In some embodiments of this application, please refer to Figures 3 to 5 , Figure 3 A top view of the battery device 100 provided in this embodiment, Figure 4 for Figure 3 BB cross-sectional view, Figure 5 for Figure 4 A partial enlarged view at A. Specifically, the present embodiment provides a battery device 100. The battery device 100 may include a battery cell 20 and an isolation plate 30. The battery cell 20 may include at least a housing 201 and a terminal assembly 202. The housing 201 may include at least a first wall 2011. The terminal assembly 202 is disposed on the first wall 2011. The isolation plate 30 includes a main body 301 and a sealing portion 302, and the main body 301 is provided with a first through hole 3011, and the number of the first through holes 3011 may include multiple. The terminal assembly 202 is partially or entirely located in the first through hole 3011. The sealing portion 302 is arranged along the circumference of the first through hole 3011. In addition, the sealing portion 302 is also connected to the main body 301. The sealing portion 302 is used to seal the gap between the hole wall of the first through hole 3011 and the terminal assembly 202.

[0084] The first wall 2011 is one of the side walls of the housing 201. The terminal assembly 202 may include at least an electrode terminal 2021. In some examples, the terminal assembly 202 may only include the electrode terminal 2021. The isolation plate 30 is a component for isolating the battery cell 20 from the busbar 40 to keep the two insulated.

[0085] In the above embodiment, the sealing portion 302 is arranged at a circumferential position of the first through hole 3011, and seals the gap between the hole wall of the first through hole 3011 and the terminal assembly 202. This arrangement can reduce the short circuit between the terminal assembly 202 and the outer shell 201 caused by particles of the assembly parts themselves or particles generated by the assembly process falling into the gap during the subsequent assembly process, thereby improving the reliability of the final battery device 100.

[0086] For example, in the subsequent assembly process of the battery cell 20 and other assembly parts, particles on other assembly parts may detach from the assembly parts and fall into the gap between the hole wall of the first through hole 3011 and the terminal assembly 202. In some scenarios, in the subsequent process, when the battery cell 20 and the busbar 40 are assembled, the terminal assembly 202 of the battery cell 20 and the busbar 40 are welded, and welding particles may fall into the gap between the hole wall of the first through hole 3011 and the terminal assembly 202. When the technical solution in the embodiment of the present application is adopted, the occurrence of the above situation can be reduced, and the reliability of the final battery device 100 can be improved.

[0087] In some examples, in an application scenario where a top patch is provided on a side wall of the housing 201 adjacent to the terminal assembly 202, when the setting of the above-mentioned embodiment of the present application is adopted, when the sealing portion 302 is made of insulating material, the sealing portion 302 seals the gap between the hole wall of the first through hole 3011 and the terminal assembly 202, which can effectively improve the insulation state between the terminal assembly 202 and the housing 201, making it difficult to break the insulation state between the two. Therefore, the originally provided top patch can be cancelled, thereby reducing the use of consumables and the assembly process of the corresponding consumables, which can effectively improve the economy of the battery device 100.

[0088] In some embodiments of the present application, the hardness of the sealing portion 302 is less than the hardness of the main body portion 301 .

[0089] The sealing portion 302 is connected to the main body portion 301, and the hardness of the sealing portion 302 can be set to be smaller than the hardness of the main body portion 301. This setting enables the sealing portion 302 to deform at the position of the first through hole 3011 during the assembly of the isolation plate 30 with the terminal assembly 202, thereby achieving the purpose of sealing the gap between the hole wall of the first through hole 3011 and the terminal assembly 202.

[0090] In some examples, when the main body 301 is made of a material with low hardness and easy to deform, during the process of assembling the main body 301 with the terminal assembly 202, the sealing portion 302 can deform before the main body 301 because the hardness of the sealing portion 302 is less than that of the main body 301, thereby achieving the purpose of sealing the gap between the hole wall of the first through hole 3011 and the terminal assembly 202.

[0091] In other examples, when the main body 301 is made of a material with high hardness and not easy to deform, the sealing part 302 has a low hardness and can also support its deformation to achieve the purpose of sealing the gap between the hole wall of the first through hole 3011 and the terminal assembly 202.

[0092] In some embodiments of the present application, the sealing portion 302 may be made of flexible plastic, and the main body 301 may be made of hard plastic.

[0093] When the material of the main body 301 is hard plastic, it can provide better support for other components, and facilitate the bearing of other assembly components, connecting wire harnesses, etc. during the subsequent assembly process. When the sealing part 302 is made of flexible plastic, the sealing part 302 is more likely to deform during the assembly of the main body 301 and the terminal assembly 202, thereby sealing the gap between the hole wall of the first through hole 3011 and the terminal assembly 202.

[0094] For example, the sealing portion 302 may be made of soft materials such as thermoplastic polyurethane elastomer (TPU) and ethylene propylene diene monomer (EPDM).

[0095] When the sealing portion 302 is made of flexible plastic, the material itself has insulation properties, and in a scenario where a top patch is provided, the top patch can be removed, thereby improving the overall economic efficiency of the battery device 100. On the other hand, both hard plastic and flexible plastic have low costs, which can improve the overall economic efficiency of the battery device 100.

[0096] In some embodiments of this application, please refer to Figures 8 to 11 , Figure 8 is a schematic diagram of the structure before the isolation plate 30 and the battery cell 20 are assembled. Fig. 9 is a top view of the separator 30 and the battery cell 20 before assembly. Fig.10 yes Fig. 9 AA section view, Fig.11 yes Fig.10 A partial enlarged view at point B. The outer peripheral surface of the sealing portion 302 is connected to the hole wall of the first through hole 3011 .

[0097] In the above embodiment, the sealing part 302 is connected to the hole wall of the first through hole 3011, and the sealing part 302 pre-closes and assembles the first through hole 3011. When the terminal assembly 202 and the main body 301 are subsequently assembled, the sealing part 302 will follow the main body 301 in the assembly process to seal the gap between the hole wall of the first through hole 3011 and the terminal assembly 202, so as to achieve a better assembly effect.

[0098] In some embodiments of this application, please refer to Figure 5 and Fig.11 The hole wall of the first through hole 3011 is formed with a first step surface 3012, and the outer peripheral surface of the sealing portion 302 is formed with a second step surface 3021. In the thickness direction of the first wall 2011, the first step surface 3012 and the second step surface 3021 are arranged opposite to each other and connected to each other.

[0099] The thickness direction of the first wall 2011 refers to the direction from the separator 30 to the battery cell 20 and the opposite direction.

[0100] In the above embodiment, a first step surface 3012 and a second step surface 3021 are formed on the hole wall of the first through hole 3011 and the outer peripheral surface of the sealing part 302 to cooperate with each other, which can increase the connection area between the sealing part 302 and the main body 301, thereby improving the connection reliability between the two.

[0101] In some embodiments of this application, reference is still made to Figure 5 and Fig.11 Along the thickness direction of the first wall 2011 , the first step surface 3012 is arranged toward the first wall 2011 , and the second step surface 3021 is arranged away from the first wall 2011 .

[0102] In the above embodiment, the first step surface 3012 formed on the hole wall of the first through hole 3011 is arranged toward the first wall 2011, and the second step surface 3021 formed on the outer peripheral surface of the sealing portion 302 is arranged away from the first wall 2011, so that the main body 301 can press a part of the sealing portion 302 between the main body 301 and the housing 201. During the assembly process of the isolation plate 30 and the battery cell 20, at least a part of the terminal assembly 202 of the battery cell 20 will pass through the first through hole 3011 formed on the main body 301. When the sealing portion 302 is connected to the hole wall of the first through hole 3011, the terminal assembly 202 will contact the sealing portion 302 during the process of passing through the first through hole 3011, and a force will be applied to the sealing portion 302 away from the battery cell 20. At this time, the arrangement in the above embodiment is adopted, that is, the first step surface 3012 and the second step surface 3021 face each other, and the second step surface 3021 is facing away from the first wall 2011. When the terminal assembly 202 applies a force to the sealing part 302 facing away from the battery cell 20 housing 201, the main body 301 can apply a force in the opposite direction to the sealing part 302 to improve the connection reliability between the main body 301 and the sealing part 302.

[0103] In some examples, when the sealing portion 302 is made of a deformable material, the main body 301 can apply a force toward the first wall 2011 to the sealing portion 302 through the first step surface 3012 formed during the assembly with the terminal assembly 202. Under the action of the relative forces between the main body 301 and the first wall 2011, the sealing portion 302 will deform to opposite sides, and the edge of the sealing portion 302 can be as close as possible to the junction area between the terminal assembly 202 and the first wall 2011, so that the contact area between the sealing portion 302 and the terminal assembly 202 is larger, and the sealing portion 302 can achieve better sealing performance.

[0104] In some embodiments of the present application, the sealing portion 302 and the main body portion 301 are integrally injection molded.

[0105] In the above embodiment, the sealing portion 302 and the main body portion 301 can be integrally injection molded. The integral injection molding can reduce the assembly process and improve the connection reliability.

[0106] In some examples, further reference may be made to Figure 6 The sealing portion 302 and the main body portion 301 may also be connected by bonding or other methods.

[0107] In some examples, the sealing portion 302 and the main body portion 301 may also be connected by hot-melt connection to achieve the connection between the two.

[0108] In some embodiments of this application, reference is still made to Figure 5 and Fig.11 The sealing portion 302 is interference fit with the terminal assembly 202 .

[0109] In the above embodiment, the sealing portion 302 is connected to the hole wall position of the first through hole 3011, and then during the assembly process of the main body 301 and the battery cell 20, the sealing portion 302 is deformed to fill and seal the gap between the hole wall of the first through hole 3011 and the terminal assembly 202.

[0110] In some embodiments of this application, reference is still made to Figures 3 to 5 The battery device 100 further includes a busbar 40. The busbar 40 is disposed on a side of the isolation plate 30 that faces away from the first wall 2011. The terminal assembly 202 includes an electrode terminal 2021. During the assembly of the terminal assembly 202 and the busbar 40, the electrode terminal 2021 passes through the first through hole 3011 and is connected to the busbar 40.

[0111] A plurality of battery cells 20 are connected via a busbar 40 to form a battery device 100 for application in different usage scenarios.

[0112] In the above embodiment, the sealing portion 302 seals the gap between the hole wall of the first through hole 3011 and the terminal assembly 202, thereby making it difficult for possible welding particles to affect the electrical connection between the terminal assembly 202 and the housing 201, thereby improving the reliability of the battery device 100.

[0113] In some embodiments of the present application, the current collector 40 and the isolation plate 30 are integrally formed. In this embodiment, the current collector 40 and the isolation plate 30 are integrally arranged to form an isolation plate assembly, which is used to connect multiple battery cells in the battery device 100 and to insulate, thereby improving the convenience of assembly.

[0114] In some other embodiments of the present application, the busbar 40 and the isolation plate 30 are riveted. In this embodiment, the busbar 40 and the isolation plate 30 are riveted to form an integrated structure, and then connected to the terminal assembly 202.

[0115] In some embodiments of this application, reference is still made to Figure 5 and Fig.11 The terminal assembly 202 includes an electrode terminal 2021, an insulating member 2022 and a connecting member 2023. The insulating member 2022 is configured to insulate the electrode terminal 2021 from the housing 201. The connecting member 2023 is at least partially disposed on the periphery of the electrode terminal 2021, the electrode terminal 2021 is connected to the first wall 2011 through the connecting member 2023, and the insulating member 2022 is at least partially disposed between the electrode terminal 2021 and the connecting member 2023. Through this arrangement, the terminal assembly 202 can be fixed relative to the housing 201, thereby making the terminal assembly 202 have better reliability relative to the housing 201.

[0116] In some examples, the connector 2023 may be partially disposed on the periphery of the electrode terminal 2021 , and another portion of the connector 2023 may extend and be disposed inside the insulating member 2022 to form a whole with the insulating member 2022 .

[0117] For example, the portion of the connector 2023 extending from the insulating member 2022 may be provided with a plurality of through holes, and then the insulating member 2022 and the connector 2023 may be integrally formed by casting. By this arrangement, the insulating member 2022 and the connector 2023 may have better connection reliability.

[0118] In some embodiments of this application, please refer to Figure 5 The sealing part 302 seals the gap between the hole wall of the first through hole 3011 and the insulating member 2022. In this embodiment, the sealing part 302 abuts against the hole wall of the first through hole 3011, which can reduce the probability of particles dropped during the subsequent assembly process contacting the housing 201, thereby reducing the situation where the insulation of the housing 201 is affected.

[0119] In some examples, the insulating member 2022 has a height difference with the first wall 2011, which can support the sealing portion 302 to abut against the insulating member 2022 as much as possible, but it is difficult to contact the electrode terminal 2021. Based on this setting, the sealing portion 302 can maintain a certain distance from the electrode terminal 2021. In the subsequent assembly process, the sealing portion 302 is difficult to interfere with the electrode terminal 2021, which can effectively reduce the impact on the subsequent assembly process of the electrode terminal 2021. On the other hand, when the sealing portion 302 abuts against the insulating member 2022 and does not contact the electrode terminal 2021, the sealing portion 302 can freely choose conductive or non-conductive materials, and the selection surface is larger.

[0120] In some other embodiments of this application, please refer to Figure 7 , along the thickness direction of the first wall 2011, the insulating member 2022 has a first surface facing the busbar 40, and the electrode terminal 2021 has a first convex portion 20211 protruding from the first surface, and the first convex portion 20211 is connected to the busbar 40. The sealing portion 302 seals the gap between the first through hole 3011 and the first convex portion 20211. Through this arrangement, in the subsequent assembly process, the probability of the particles that may fall and contact the insulating member 2022 can be reduced, and the insulation between the electrode terminal 2021 and the housing 201 can be further improved.

[0121] In some examples, there is no height difference between the insulating member 2022 and the first wall 2011, or the height difference cannot support the sealing portion 302 to abut against the insulating member 2022 over a large area. At this time, the sealing portion 302 may partially abut against the electrode terminal 2021 to achieve the purpose of sealing the gap between the hole wall of the first through hole 3011 and the insulating member 2022.

[0122] In some other embodiments of the present application, the terminal assembly 202 includes an electrode terminal 2021 . At least a portion of the electrode terminal 2021 is located in the first through hole 3011 , and the sealing portion 302 seals the gap between the hole wall of the first through hole 3011 and the electrode terminal 2021 .

[0123] In some examples, the sealing portion 302 may be made of an insulating material to maintain insulation between the electrode terminal 2021 and the housing 201 .

[0124] In other examples, the top patch may still be provided to maintain insulation between the electrode terminal 2021 and the housing 201 .

[0125] According to some embodiments of the present application, a battery device 100 is provided, comprising a battery cell 20 and a separator 30. The battery cell 20 comprises a housing 201 and a terminal assembly 202, the housing 201 comprises a first wall 2011, and the terminal assembly 202 is disposed on the first wall 2011. The terminal assembly 202 comprises an electrode terminal 2021, an insulating member 2022, and a connector 2023. The connector 2023 is at least partially disposed on the periphery of the electrode terminal 2021, and the connector 2023 is connected to the first wall 2011. The insulating member 2022 is at least partially disposed between the electrode terminal 2021 and the connector 2023. The electrode terminal 2021 is connected to the tab through an adapter 50. The separator 30 comprises a main body 301 and a sealing portion 302. The main body 301 is provided with a first through hole 3011, and the terminal assembly 202 is at least partially located in the first through hole 3011. The sealing portion 302 is disposed along the circumference of the first through hole 3011. The material of the main body 301 can be hard plastic, and the material of the sealing part 302 can be flexible plastic. During the assembly process, the sealing part 302 is deformed and has an interference fit with the terminal assembly 202, so as to seal the gap between the hole wall of the first through hole 3011 and the terminal assembly 202. The hole wall of the first through hole 3011 is formed with a first step surface 3012, and the outer peripheral surface of the sealing part 302 is formed with a second step surface 3021. Along the thickness direction of the first wall 2011, the first step surface 3012 is arranged toward the first wall 2011, and the second step surface 3021 is arranged away from the first wall 2011. Through this arrangement, the connection reliability between the sealing part 302 and the main body 301 can be improved. The sealing part 302 and the main body 301 are integrally injection molded to improve the connection reliability between the two.

[0126] According to some embodiments of the present application, the sealing part 302 is made of a flexible material. When the isolation plate 30 is not connected to the battery cell, the sealing part 302 is connected to the hole wall of the first through hole 3011, and the aperture of the sealing part 302 is smaller than the cross-sectional size of the electrode terminal 2021. At this time, there is interference between the sealing part 302 and the electrode terminal 2021 in the thickness direction of the first wall 2011. The isolation plate 30 and the busbar 40 are integrally formed to form an isolation plate assembly. When the isolation plate assembly is assembled with the battery cell, the electrode terminal 2021 is first aligned with the position of the first through hole 3011 and placed, and then the busbar 40 is connected to the electrode terminal 2021 by welding. During the welding process, the isolation plate assembly gradually approaches the battery cell. At this time, the sealing part 302 gradually deforms to achieve an interference fit with the electrode terminal 2021.

[0127] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present 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 device, characterized in that: include: A battery cell, comprising a housing and a terminal assembly, wherein the housing comprises a first wall, and the terminal assembly is disposed on the first wall; The isolation plate includes a main body and a sealing portion, wherein the main body is provided with a first through hole, wherein at least a portion of the terminal assembly is located in the first through hole, and wherein the sealing portion is arranged along the circumference of the first through hole and connected to the main body, wherein the sealing portion seals the gap between the hole wall of the first through hole and the terminal assembly.

2. The battery device according to claim 1, characterized in that: The hardness of the sealing portion is smaller than the hardness of the main body portion.

3. The battery device according to claim 2, characterized in that: The sealing part is made of flexible plastic, and the main body is made of hard plastic.

4. The battery device according to claim 1, characterized in that: The outer peripheral surface of the sealing portion is connected to the hole wall of the first through hole.

5. The battery device according to claim 4, characterized in that: The hole wall of the first through hole is formed with a first step surface, and the outer peripheral surface of the sealing portion is formed with a second step surface; along the thickness direction of the first wall, the first step surface and the second step surface are arranged opposite to each other and connected to each other.

6. The battery device according to claim 5, characterized in that: Along the thickness direction of the first wall, the first step surface is arranged toward the first wall, and the second step surface is arranged away from the first wall.

7. The battery device according to claim 1, characterized in that: The sealing portion and the main body portion are integrally injection-molded.

8. The battery device according to claim 1, characterized in that: The sealing part is bonded or thermally melted to the main body.

9. The battery device according to claim 1, characterized in that: The sealing portion is interference-fitted with the terminal assembly.

10. The battery device according to any one of claims 1 to 9, characterized in that: The battery device further comprises: A current collector is arranged on a side of the isolation plate facing away from the first wall; The terminal assembly includes an electrode terminal passing through the first through hole and connected to the bus bar.

11. The battery device according to claim 10, characterized in that: The current collector and the isolation plate are integrally formed.

12. The battery device according to claim 10, characterized in that: The terminal assembly includes an electrode terminal, an insulating member and a connecting member, wherein the connecting member is at least partially disposed on the periphery of the electrode terminal, the connecting member is connected to the first wall, and the insulating member is at least partially disposed between the electrode terminal and the connecting member.

13. The battery device according to claim 12, characterized in that: The sealing portion seals a gap between a hole wall of the first through hole and the insulating member.

14. The battery device according to claim 12, characterized in that: Along the thickness direction of the first wall, the insulating member has a first surface facing the busbar, the electrode terminal has a first convex portion protruding from the first surface, and the first convex portion is connected to the busbar; The sealing portion seals a gap between a hole wall of the first through hole and the first protrusion.

15. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1-14.

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