Battery monomer, battery device and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and an insulating part, the shell comprises a first wall, a second wall and a side wall, the first wall and the second wall are oppositely arranged along a first direction, one end of the side wall is connected with the first wall, the other end of the side wall is connected with the second wall, and the first wall is provided with a medium injection port; the electrode assembly is provided with a first side face facing the side wall, and a gap is formed between the first side face and the inner surface of the shell; the insulating part is arranged between the first wall and the electrode assembly; a first diversion trench and a second diversion trench which are communicated with each other are formed in the side, facing the first wall, of the insulating part, the first diversion trench is used for guiding a medium injected from the medium injection port to the second diversion trench, the insulating part is provided with a flow outlet, and on the same projection plane perpendicular to the first direction, the orthographic projection of the flow outlet falls into the orthographic projection of the gap. According to the technical scheme provided by the invention, the reliability of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important part of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, besides improving energy density, battery reliability is also a crucial issue. Therefore, how to improve battery reliability is a technical problem that needs to be solved in battery technology. Utility Model Content

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

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

[0006] In a first aspect, embodiments of this application provide a battery cell, which includes a casing, an electrode assembly, and an insulating member. The casing includes a first wall, a second wall, and a side wall. The first wall and the second wall are disposed opposite each other along a first direction. The side wall surrounds the second wall, with one end of the side wall connected to the first wall and the other end of the side wall connected to the second wall. The first wall is provided with a medium injection port. The electrode assembly is disposed inside the casing and has a first side facing the side wall. A gap is formed between the first side and the inner surface of the casing. The insulating member is disposed between the first wall and the electrode assembly. The insulating member has a first guide channel and a second guide channel that are interconnected on the side facing the first wall. The first guide channel is used to guide the medium injected from the medium injection port to the second guide channel. The second guide channel is disposed at the edge of the insulating member and is arranged around the circumference of the insulating member. The insulating member is provided with an outlet that connects the interior and exterior of the second guide channel. On the same projection plane perpendicular to the first direction, the orthographic projection of the outlet falls into the orthographic projection of the gap.

[0007] According to the embodiments of this application, the battery cell has a first and a second flow channel on the insulating member, which are interconnected to allow the medium (e.g., electrolyte) injected through the medium injection port to flow towards the edge of the insulating member, ensuring smooth flow of the medium. The medium then enters the interior of the battery cell through the outlet on the insulating member. On the same projection plane perpendicular to the first direction, the orthographic projection of the outlet falls within the orthographic projection of the gap. The medium flowing out of the outlet can pass through the gap between the electrode assembly and the outer casing, flowing along the inner surface of the outer casing to the bottom side of the electrode assembly inside the outer casing. On the one hand, due to the existence of the gap between the electrode assembly and the inner surface of the outer casing, the resistance encountered by the medium injected into the battery cell is smaller, which can improve the liquid injection efficiency. On the other hand, after the medium flows into the bottom side of the electrode assembly inside the outer casing, the medium wets from the bottom of the electrode assembly upwards, allowing the medium to more uniformly wet the electrode assembly inside the battery cell, improving the consistency of the wetting effect and enhancing the wetting effect of the medium on the electrode assembly. Furthermore, the medium adopts a bottom-up wetting method, which reduces the risk of residual gas inside the battery cell being unable to escape due to liquid sealing phenomenon during the liquid injection and settling process of the battery cell, thereby improving the reliability of the battery cell.

[0008] According to some embodiments of this application, the insulating member has a second side facing the sidewall, and the outlet is disposed on the second side; on the same projection plane perpendicular to the first direction, the orthographic projection of the second side falls into the orthographic projection of the gap.

[0009] In the above scheme, the outlet is set on the second side, and the orthographic projection of the second side falls into the orthographic projection of the gap. In this way, the medium in the second guide groove flows out directly from the outlet opened on the second side of the insulating component and enters the gap between the outer shell and the electrode assembly along the inner wall of the outer shell, thereby wetting the electrode assembly and reducing the risk of the medium directly acting on the electrode assembly when it enters the battery cell.

[0010] According to some embodiments of this application, there are multiple outlets, which are spaced apart along the extension direction of the second guide channel.

[0011] In the above scheme, multiple outlets are distributed at intervals on the second guide channel. The multiple outlets work together to make the discharge speed of the medium in the second guide channel faster, so that the medium can flow into the interior of the battery cell more quickly. In addition, the multiple outlets discharge the medium together, which disperses the fluid pressure of the medium injection, reduces the risk of the medium escaping from the second guide channel due to the slow discharge speed, and improves the medium injection efficiency.

[0012] According to some embodiments of this application, the second flow channel includes two first sub-flow channels and two second sub-flow channels. The two first sub-flow channels are located on opposite sides of the insulating member in a second direction and are connected to the first flow channel. The two second sub-flow channels are located on opposite sides of the insulating member in a third direction and are connected to the two first sub-flow channels at both ends. Multiple outlets are disposed in the first sub-flow channels and / or the second sub-flow channels. The first direction, the second direction, and the third direction are perpendicular to each other.

[0013] In the above scheme, the second flow channel includes two first sub-flow channels and two second sub-flow channels. The first sub-flow channels are connected to the first flow channel. The medium entering the first flow channel first flows into the two first sub-flow channels on both sides of the second direction on the insulating component, and then flows into the two second sub-flow channels on both sides of the third direction on the insulating component. The first and second sub-flow channels are arranged around the edge direction of the insulating component, which increases the flow path of the medium in the edge direction of the insulating component, which is more conducive to the smooth flow of the medium. It also disperses and buffers the fluid pressure of pressurized injection, allowing the medium to enter the interior of the battery cell from all directions of the edge of the insulating component, improving the injection efficiency of the medium and the wetting effect on the electrode assembly.

[0014] According to some embodiments of this application, the second sub-channel includes two branch channels, the opposite ends of the two branch channels are respectively connected to two first sub-channels, and the opposite ends of the two branch channels are not connected.

[0015] In the above scheme, the second sub-channel includes two branch channels. One end of each branch channel is connected to the first sub-channel, and the other end of the branch channel is not connected to the other branch channel, providing more options for the layout of the second guide groove on the insulating component.

[0016] According to some embodiments of this application, the wall of the second guide channel includes a bottom wall, an inner side wall, and an outer side wall. The outer side wall and the inner side wall are arranged opposite to each other. The outer side wall is arranged closer to the side wall of the outer shell than the inner side wall. The outlet is arranged on the outer side wall and / or the bottom wall and penetrates the insulating member.

[0017] In the above scheme, the bottom wall serves to support the medium, while the outer and inner side walls are positioned opposite each other on both sides of the bottom wall. These outer and inner side walls constrain the medium and guide its flow along the extension direction of the second guide channel. The outlet is located on the outer side wall and / or the bottom wall and penetrates the insulating component. After flowing out of the outlet along the thickness direction of the insulating component, the medium in the second guide channel flows into the gap between the electrode assembly and the outer shell.

[0018] According to some embodiments of this application, the outlet includes a first outlet along a first direction. The first outlet is a notch structure that at least penetrates the outer side wall. The first outlet is disposed in a first sub-channel and / or a second sub-channel.

[0019] In the above scheme, the first outlet is a notch structure that penetrates at least the outer side wall of the second guide channel. In this way, the medium in the second guide channel flows out directly from the notch on the outer side wall and flows downward along the thickness direction of the insulating part into the gap between the outer shell and the electrode assembly. The medium flows out more smoothly and the medium is less likely to accumulate in the second guide channel.

[0020] According to some embodiments of this application, the outlet includes a second outlet, which is a through-hole structure disposed through the bottom wall, and the second outlet is disposed at least in the first sub-channel.

[0021] In the above scheme, the second outlet adopts a through-hole structure that runs through the bottom wall. The medium in the second guide channel can flow directly from the through-hole structure on the bottom wall into the gap between the outer shell and the electrode assembly. The medium flows out more smoothly, and the medium is less likely to accumulate in the second guide channel.

[0022] According to some embodiments of this application, the insulating member includes a body and a flange, the flange being disposed around the edge of the body, and a second flow channel being formed between the flange and the body; in the thickness direction of the first wall, the height of the body protruding from the bottom surface of the second flow channel is greater than the height of the flange protruding from the bottom surface of the second flow channel.

[0023] In the above scheme, when the injection speed of the medium in the second guide channel is too fast, the discharge speed of the medium at the outlet of the second guide channel is less than the injection speed of the medium. The height of the main body protruding from the bottom surface of the second guide channel is greater than the height of the flange protruding from the bottom surface of the second guide channel. That is, the flange protrudes lower than the main body. Excess medium that cannot be discharged in the second guide channel will overflow from the top surface of the flange, which will accelerate the discharge speed of the medium, reduce the risk of the medium overflowing onto the main body, and play a corresponding protective role for the components on the main body.

[0024] According to some embodiments of this application, the width of the first guide channel gradually increases along the flow direction of the medium in the first guide channel.

[0025] In the above scheme, as the width of the first guide channel gradually increases, it can disperse the medium and slow down the medium flow rate, allowing the medium to enter the second guide channel more smoothly.

[0026] According to some embodiments of this application, along a first direction, the projection of the medium injection port onto the insulating member is located within a first guide groove.

[0027] In the above scheme, the projection of the medium injection port on the insulating component is located within the first guide groove, which facilitates the first guide groove to directly receive the medium injected by the medium injection port and disperse the medium.

[0028] According to some embodiments of this application, the first guide channel has a first channel bottom surface disposed opposite to the inner surface of the first wall, and a first clearance groove is disposed on the first channel bottom surface. The first clearance groove is recessed in a direction away from the inner surface of the first wall, and the first clearance groove is disposed opposite to the medium injection port along a first direction.

[0029] In the above scheme, the first clearance groove on the first flow guide groove provides clearance for the fasteners connecting the first wall and the insulating component, facilitating the assembly of the first wall and the insulating component. Furthermore, the first clearance groove is positioned opposite the medium injection port; the medium injected through the medium injection port first flows into the first clearance groove and then is guided from the first clearance groove into the first flow guide groove. The first clearance groove acts as a buffer for the medium, reducing the risk of medium splashing.

[0030] According to some embodiments of this application, the first clearance groove has a second groove bottom surface disposed opposite to the inner surface of the first wall, and the second groove bottom surface is provided with a first through hole, which penetrates the insulating member along a first direction.

[0031] In the above scheme, the first through hole on the first clearance groove has two advantages. First, it allows a portion of the medium injected from the medium injection port to directly enter the interior of the electrode assembly without passing through the first guide groove, thus increasing the liquid entry path for the medium into the battery cell. Second, the first through hole ensures that no medium residue remains in the first clearance groove, reducing the risk of corrosion of the battery cell due to medium residue inside the insulating component.

[0032] Secondly, embodiments of this application also provide a battery device, which includes the battery cells of any of the foregoing embodiments.

[0033] Thirdly, embodiments of this application also provide an electrical device, which includes a battery cell from any of the foregoing embodiments, and the electrical device is used to provide electrical energy.

[0034] The power device provided in this application embodiment has the same technical effect as the battery device provided in any of the above embodiments, and will not be described again here.

[0035] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0038] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0039] Figure 3 This is an exploded schematic diagram of a battery cell provided in some embodiments of this application;

[0040] Figure 4 An exploded view of the first wall and insulating element in a battery cell provided for some embodiments of this application;

[0041] Figure 5 A front sectional view of a battery cell provided in some embodiments of this application;

[0042] Figure 6 for Figure 5 Enlarged diagram of A in the middle;

[0043] Figure 7 This is a schematic diagram of the structure of the insulating component in a battery cell provided in some embodiments of this application;

[0044] Figure 8 for Figure 7 Enlarged diagram of B in the middle;

[0045] Figure 9 A top view of an insulating component in a battery cell provided in some embodiments of this application;

[0046] Figure 10 A top view of an insulating component in a battery cell provided in other embodiments of this application;

[0047] Figure 11 This is a schematic diagram of a battery cell with a second outlet in the insulating component, provided in some embodiments of this application.

[0048] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 10 - Housing; 11 - First Sub-Housing; 12 - Second Sub-Housing; 20 - Battery Cell; 21 - Housing; 211 - Side Wall; 212 - First Wall; 2121 - Medium Injection Port; 213 - Second Wall; 22 - Electrode Assembly; 221 - First Side Surface; 23 - Electrode Terminal; 24 - Insulator; 241 - First Guide Channel; 2411 - First Clearance Channel; 2412-First through hole; 242-Second guide groove; 2421-First sub-flow channel; 2422-Second sub-flow channel; 24221-Branch channel; 2423-Bottom wall; 2424-Inner side wall; 2425-Outer side wall; 243-Outlet; 2431-First outlet; 2432-Second outlet; 244-Second side; 245-Body; 246-Flange; 247-Guide part; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0051] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0054] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0055] The battery apparatus 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 connected in series, parallel, or mixed connections via a busbar.

[0056] 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 together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0057] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0058] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0059] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0060] 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.

[0061] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0062] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0063] The battery cell may be, but is not limited to, 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.

[0064] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0065] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0066] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0067] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, carbon electrodes, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can 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.).

[0068] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used.

[0069] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0070] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, carbon electrode, carbon, nickel, or titanium, etc.

[0071] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0072] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0073] In some embodiments, the diaphragm is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0074] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0075] In some embodiments, the membrane is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0076] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0077] In some implementations, the electrode assembly is a stacked structure.

[0078] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0079] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0080] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0081] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0082] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments of this application.

[0083] In conventional batteries, the electrolyte is injected into individual cells from top to bottom, and the electrolyte also wets the electrode components from top to bottom. Therefore, during the electrolyte injection and settling process, the electrolyte flows from top to bottom into the cell, potentially causing a liquid seal. This prevents residual gas inside the cell from escaping, leading to lithium plating in the middle of the cell and affecting its reliability.

[0084] In view of this, to solve the problem of poor reliability of battery cells, some embodiments of this application provide a battery cell, which includes a shell, an electrode assembly, and an insulating member. The shell includes a first wall, a second wall, and a side wall. The first wall and the second wall are disposed opposite each other along a first direction. The side wall surrounds the second wall, with one end of the side wall connected to the first wall and the other end of the side wall connected to the second wall. The first wall is provided with a medium injection port. The electrode assembly is disposed inside the shell and has a first side facing the side wall. A gap is formed between the first side and the inner surface of the shell. The insulating member is disposed between the first wall and the electrode assembly. The insulating member has a first guide channel and a second guide channel that are interconnected on the side facing the first wall. The first guide channel is used to guide the medium injected from the medium injection port to the second guide channel. The second guide channel is disposed at the edge of the insulating member and is arranged around the circumference of the insulating member. The insulating member is provided with an outlet that connects the inside and outside of the second guide channel. On the same projection plane perpendicular to the first direction, the orthographic projection of the outlet falls into the orthographic projection of the gap.

[0085] The battery cell provided in this application embodiment has an outlet projection that falls within the gap projection. The medium flowing out of the outlet can pass through the gap between the electrode assembly and the casing, flowing along the inner surface of the casing to the bottom side of the electrode assembly inside the casing. On one hand, due to the existence of the gap between the electrode assembly and the inner surface of the casing, the resistance encountered by the medium when injecting into the battery cell is smaller, improving the liquid injection efficiency. On the other hand, after the medium flows into the bottom side of the electrode assembly inside the casing, the medium wets from the bottom of the electrode assembly upwards, allowing for more uniform wetting of the electrode assembly inside the battery cell, improving the consistency of the wetting effect and enhancing the wetting effect of the medium on the electrode assembly. Furthermore, the bottom-up wetting method reduces the risk of residual gas inside the battery cell being unable to escape due to liquid sealing during the liquid injection and settling process, thus improving the reliability of the battery cell.

[0086] The battery device disclosed in this application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using the battery device disclosed in this application.

[0087] The technical solutions described in the embodiments of this 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, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0088] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0089] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0090] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0091] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0092] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one open end, while the first sub-housing 11 may be a plate-like structure, covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 jointly define the space. Alternatively, both the first sub-housing 11 and the second sub-housing 12 may be hollow structures with one open side, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0093] In the battery device 100, there can be multiple battery cells 20. These multiple battery cells 20 can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also be composed of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0094] The battery device 100 may also include other structures, such as a busbar for electrical connection between multiple battery cells 20.

[0095] Please refer to Figure 3 , Figure 3 This is an exploded view of a battery cell provided in an embodiment of this application. The battery cell 20 includes a housing 21, an electrode assembly 22, and electrode terminals 23.

[0096] Electrode terminals 23 can be electrically connected to electrode assemblies 22 for outputting or inputting electrical energy into the battery cell 20. Electrode assemblies 22 are components within the battery cell 20 where electrochemical reactions occur. The housing 21 may contain one or more electrode assemblies 22.

[0097] This application provides a single battery cell; please refer to... Figures 3 to 6 The battery cell 20 includes a housing 21, an electrode assembly 22, and an insulating component 24. The housing 21 includes a first wall 212, a second wall 213, and a side wall 211. The first wall 212 and the second wall 213 are arranged opposite to each other along a first direction X. The side wall 211 surrounds the second wall 213. One end of the side wall 211 is connected to the first wall 212, and the other end of the side wall 211 is connected to the second wall 213. The first wall 212 is provided with a medium injection port 2121. The electrode assembly 22 is disposed inside the housing 21. The electrode assembly 22 has a first side surface 221 facing the side wall 211. A gap is formed between the first side surface 221 and the inner surface of the housing 21. An insulating member 24 is disposed between the first wall 212 and the electrode assembly 22. The insulating member 24 has a first guide groove 241 and a second guide groove 242 that are interconnected on the side facing the first wall 212. The first guide groove 241 is used to guide the medium injected by the medium injection port 2121 to the second guide groove 242. The second guide groove 242 is disposed on the edge of the insulating member 24 and is arranged around the circumference of the insulating member 24. The insulating member 24 has an outlet 243 that connects the inside and outside of the second guide groove 242. On the same projection plane perpendicular to the first direction X, the orthographic projection of the outlet 243 falls into the orthographic projection of the gap.

[0098] The outer casing 21 is a component used to form the internal environment of the battery cell 20, which can accommodate the electrode assembly 22, the dielectric (e.g., electrolyte), and other components. Please refer to... Figure 3 The first wall 212, the second wall 213, and the side wall 211 are components of the outer casing 21. The first wall 212 and the second wall 213 are arranged opposite each other along a first direction X. The two ends of the side wall 211 in the first direction X are connected to the first wall 212 and the second wall 213, respectively. The first direction X can be the thickness direction of either the first wall 212 or the second wall 213. A medium injection port 2121 is provided on the first wall 212. The medium injection port 2121 can be a hole that penetrates the first wall 212 along its thickness direction. The medium injection port 2121 connects the interior and exterior of the battery cell 20, so that the medium can enter the interior of the battery cell from the exterior of the battery cell 20.

[0099] Electrode terminals 23 are disposed on the first wall 212. Electrode terminals 23 can be insulatedly connected to the first wall 212 by means of riveting or injection molding. One or two electrode terminals 23 can be provided on one first wall 212.

[0100] Insulator 24 is an electrical connection component within the insulating housing 21 that is connected to the housing 21 to reduce the risk of short circuits. Insulator 24 may be made of plastic, rubber, or the like.

[0101] Please combine Figure 5 and Figure 6 The insulating element 24 is disposed between the first wall 212 and the electrode assembly 22, and can be arranged sequentially along the first direction X. In the figure, the direction indicated by the letter X is the first direction X, which is the thickness direction of the outer shell 21 or the thickness direction of the first wall 212.

[0102] The medium can be an electrolyte, such as an electrolyte solution, which plays a role in conducting ions between the positive and negative electrodes. The interior of the battery cell 20 refers to the area enclosed by the inner wall of the outer casing 21, which is used to house the electrode assembly 22. The insulating member 24 is connected to the first wall 212, and the insulating member 24 and the outer casing 21 define the interior of the battery cell.

[0103] Please refer to Figure 4 The first guide groove 241 is a groove structure disposed on the insulating member 24. The medium can flow in the first guide groove 241. The first guide groove 241 can guide the medium injected from the medium injection port 2121 towards the edge of the insulating member 24.

[0104] The second flow channel 242 is a channel structure that extends around the edge of the insulating member 24 on the side facing the first wall 212. When the medium flows in the second flow channel 242, the medium can flow around the edge of the insulating member 24 so that the medium has a longer flow path.

[0105] The second guide groove 242 can be an annular closed structure surrounding the edge of the insulating member, or a semi-closed structure surrounding the edge of the insulating member 24.

[0106] The outlet 243 refers to the outlet structure connecting the inside and outside of the second guide channel 242. The outlet 243 allows the medium inside the second guide channel 242 to flow out of the second guide channel 242 and into the inside of the outer casing 21. The outlet 243 can be a notch structure or a through hole structure, but it must be able to allow the medium inside the second guide channel 242 to flow out of the second guide channel 242.

[0107] Please combine Figure 5 , Figure 6 and Figure 7 On the same projection plane perpendicular to the first direction X, the orthographic projection of the outlet 243 falls into the orthographic projection of the gap, meaning that the orthographic projection of the outlet 243 is completely within the orthographic projection of the gap. The medium flowing out of the outlet 243 will flow into the gap between the first side 221 of the electrode assembly 22 and the inner surface of the housing 21, and flow along the inner wall of the housing 21 to the bottom side of the housing 21.

[0108] According to the embodiments of this application, the battery cell 20 has a first guide groove 241 and a second guide groove 242 on the insulating member 24. The first guide groove 241 and the second guide groove 242 are interconnected to allow the medium (e.g., electrolyte) injected through the medium injection port 2121 to flow to the edge of the insulating member 24, ensuring smooth medium flow. Then, the medium enters the interior of the battery cell 20 through the outlet 243 on the insulating member 24. On the same projection plane perpendicular to the first direction X, the orthographic projection of the outlet 243 falls into the orthographic projection of the gap. The medium flowing out of the outlet 243 can flow through the gap between the electrode assembly 22 and the outer shell 21, along the inner surface of the outer shell 21, into the bottom side of the electrode assembly 22 inside the outer shell 21. On the one hand, due to the existence of the gap between the electrode assembly 22 and the inner surface of the outer shell 21, the resistance encountered by the medium injected into the battery cell 20 is smaller, which can improve the liquid injection efficiency of the medium. On the other hand, after the medium flows into the bottom side of the electrode assembly 22 inside the casing 21, the medium wets the electrode assembly 22 from bottom to top. This allows the medium to wet the electrode assembly 22 more evenly inside the battery cell 20, improving the consistency of the wetting effect and enhancing the wetting effect of the medium on the electrode assembly 22. Furthermore, the bottom-up wetting method reduces the risk of residual gas inside the battery cell 20 being unable to escape due to liquid sealing during the liquid injection and settling process, thus improving the reliability of the battery cell 20.

[0109] Based on some embodiments of this application, please refer to... Figure 6 and Figure 7 The insulating member 24 has a second side surface 244 facing the side wall 211, and the outlet 243 is disposed on the second side surface 244; on the same projection plane perpendicular to the first direction X, the orthographic projection of the second side surface 244 falls into the orthographic projection of the gap.

[0110] The second side 244 refers to the side of the insulating member 24 that is close to the side wall 211 of the outer casing 21. The outlet 243 is provided on the second side 244, which means that the second side 244 of the insulating member 24 is provided with an outlet for the medium in the second guide groove 242 to flow out. The medium in the second guide groove 242 can flow directly out from the second side 244 of the insulating member 24 and enter the interior of the outer casing 21.

[0111] The outlet 243 is set on the second side 244, and the orthographic projection of the second side 244 falls into the orthographic projection of the gap. In this way, the medium in the second guide groove 242 flows out directly from the outlet 243 opened on the second side 244 of the insulating member 24, and enters the gap between the outer shell 21 and the electrode assembly 22 along the inner wall of the outer shell 21, thereby wetting the electrode assembly 22 and reducing the risk of the medium directly acting on the electrode assembly 22 when it enters the battery cell 20.

[0112] According to some embodiments of this application, please refer to Figure 7 There are multiple outlets 243, which are distributed at intervals along the extension direction of the second guide channel 242.

[0113] Multiple outlets 243 are distributed at intervals along the extension direction of the second guide channel 242. The spacing between two adjacent outlets 243 can be equal or unequal, and the specific spacing between two adjacent outlets 243 can be determined according to the actual situation. The specific number of outlets 243 can be determined according to the actual situation. The number of outlets 243 can be any integer value such as two, four, five, six, or eight.

[0114] Multiple outlets 243 are spaced apart on the second guide channel 242. The multiple outlets 243 work together to make the discharge speed of the medium in the second guide channel 242 faster, allowing the medium to flow into the battery cell more quickly. In addition, the multiple outlets 243 discharge the medium together, which disperses the fluid pressure of the medium injection, reduces the risk of the medium escaping from the second guide channel 242 due to the slow discharge speed, and improves the medium injection efficiency.

[0115] According to some embodiments of this application, please refer to Figure 9 The second flow channel 242 includes two first sub-flow channels 2421 and two second sub-flow channels 2422. The two first sub-flow channels 2421 are located on opposite sides of the second direction Y of the insulating member 24 and are connected to the first flow channel 241. The two second sub-flow channels 2422 are located on opposite sides of the third direction Z of the insulating member 24 and are connected to the two first sub-flow channels 2421 at both ends. Multiple outlets 243 are disposed in the first sub-flow channels 2421 and / or the second sub-flow channels 2422. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0116] The multiple outlets 243 are provided on the first sub-flow channel 2421 and / or the second sub-flow channel 2422. This means that all the outlets 243 can be provided on the first sub-flow channel 2421, and no outlets 243 can be provided on the second sub-flow channel 2422. Alternatively, all the outlets 243 can be provided on the second sub-flow channel 2422, and none can be provided on the first sub-flow channel 2421. Of course, it is also possible that some of the outlets 243 are provided on the first sub-flow channel 2421, and the other part of the outlets 243 are provided on the second sub-flow channel 2422.

[0117] Alternatively, please refer to Figure 9 Multiple outlets 243 are provided on the first sub-channel 2421 and the second sub-channel 2422. The specific number of outlets 243 is not limited and depends on the actual situation.

[0118] The first direction X, the second direction Y, and the third direction Z are mutually perpendicular, meaning that any two of the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. When the first direction X is the thickness direction of the outer shell 21 or the insulating member 24, and the second direction Y is perpendicular to the third direction Z, the second direction Y can be the width direction or the length direction of the insulating member 24. Therefore, the third direction Z can be the length direction or the width direction of the insulating member 24.

[0119] The second sub-channel 2422 can be continuous in the second direction Y of the insulating member 24, meaning that both ends of the second sub-channel 2422 in the second direction Y are connected to the two first sub-channels 2421 respectively, and the second sub-channel 2422 and the first sub-channel 2421 are completely interconnected, forming an annular groove. Of course, the second sub-channel 2422 can also be discontinuous in the second direction Y of the insulating member 24, meaning that the second sub-channel 2422 is not continuous along the second direction Y, and the first sub-channel 2421 and the second sub-channel 2422 are connected to form a semi-closed annular groove.

[0120] The second flow channel 242 includes two first sub-flow channels 2421 and two second sub-flow channels 2422. The first sub-flow channels 2421 are connected to the first flow channel 241. The medium entering the first flow channel 241 first flows into the two first sub-flow channels 2421 on both sides of the second direction Y on the insulating member 24, and then flows into the two second sub-flow channels 2422 on both sides of the third direction Z on the insulating member 24. The first sub-flow channels 2421 and the second sub-flow channels 2422 are arranged around the edge of the insulating member 24, which increases the flow path of the medium in the edge direction of the insulating member 24, which is more conducive to the smooth flow of the medium. It also disperses and buffers the fluid pressure of pressurized injection, allowing the medium to enter the interior of the battery cell 20 from all directions of the edge of the insulating member 24, improving the injection efficiency of the medium and the wetting effect on the electrode assembly 22.

[0121] According to some embodiments of this application, please refer to Figure 9 , Figure 10 and Figure 11 The second sub-channel 2422 includes two branch channels 24221. The opposite ends of the two branch channels 24221 are respectively connected to the two first sub-channels 2421, and the opposite ends of the two branch channels 24221 are not connected.

[0122] The fact that the two branch channels 24221 are not connected at their opposite ends means that the beginning and end of the branch channels 24221 are not connected, and the branch channels 24221 are in a discontinuous state in the second direction Y of the insulating member 24.

[0123] The number of outlets 243 on the diversion channel 24221 can be one or more, and the specific number of outlets 243 on the diversion channel 24221 can be determined according to the actual situation. Optionally, the number of outlets 243 on the diversion channel 24221 can be two, and the two outlets 243 are distributed at intervals along the second direction Y on the diversion channel 24221.

[0124] Optionally, the number of outlets 243 on the diversion channel 24221 is three, and the three outlets 243 are distributed at intervals along the second direction Y on the diversion channel 24221.

[0125] The second sub-channel 2422 includes two branch channels 24221, one end of which is connected to the first sub-channel 2421, and the other end of which is not connected to the other branch channel 24221, providing more options for the layout of the second guide groove 242 on the insulating member 24.

[0126] According to some embodiments of this application, please refer to Figure 8 The second guide channel 242 has a bottom wall 2423, an inner side wall 2424 and an outer side wall 2425. The outer side wall 2425 and the inner side wall 2424 are arranged opposite to each other. The outer side wall 2425 is arranged closer to the side wall 211 of the outer shell 21 than the inner side wall 2424. The outlet 243 is arranged on the outer side wall 2425 and / or the bottom wall 2423 and passes through the insulating member 24.

[0127] The bottom wall 2423 is the bottom surface of the second flow channel 242, and is used to carry the medium for its flow. The inner wall 2424 and the outer wall 2425 are disposed opposite each other on both sides of the bottom wall 2423, extending from the bottom wall 2423 towards the first wall 212. The inner wall 2424 is the wall of the second flow channel 242 near the middle of the insulating member 24, and the outer wall 2425 is the wall of the second flow channel 242 away from the middle of the insulating member 24, with the outer wall 2425 being closer to the edge of the insulating member 24 than the inner wall 2424.

[0128] The outlet 243 is disposed on the outer wall 2425 and / or the bottom wall 2423, and penetrates the insulating member 24. This means that the outlet 243 can be disposed on the outer wall 2425 and penetrate the insulating member 24, or the outlet 243 can be disposed on the bottom wall 2423, or the outlet 243 can be disposed on the side wall 211 and part of the bottom wall 2423 of the second guide channel 242. The penetration depth of the outlet 243 through the second guide channel 242 can be determined according to the actual situation.

[0129] The bottom wall 2423 serves to carry the medium. The outer side wall 2425 and the inner side wall 2424 are disposed opposite each other on both sides of the bottom wall 2423. The outer side wall 2425 and the inner side wall 2424 constrain the medium and guide it to flow along the extension direction of the second guide channel 242. The outlet 243 is disposed on the outer side wall 2425 and / or the bottom wall 2423 and penetrates the insulating member 24. After the medium in the second guide channel 242 flows out from the outlet 243 along the thickness direction of the insulating member 24, it flows into the gap between the electrode assembly 22 and the outer shell 21.

[0130] According to some embodiments of this application, please refer to Figure 9 and Figure 10 The outlet 243 includes a first outlet 2431 along the first direction X. The first outlet 2431 is a notch structure that at least penetrates the outer side wall 2425. The first outlet 2431 is disposed in the first sub-channel 2421 and / or the second sub-channel 2422.

[0131] The first outlet 2431 is a notch structure that penetrates at least the outer wall 2425. This means that the first outlet 2431 can be a notch structure that penetrates the thickness direction of the outer wall 2425, or it can be a notch structure that penetrates the outer wall 2425 and part of the bottom wall 2423. The depth and width of the notch in the first outlet 2431 can be determined according to the actual situation.

[0132] The first outlet 2431 is provided on the first sub-channel 2421 and / or the second sub-channel 2422, which means that the first outlet 2431 can be provided on the first sub-channel 2421, or on the second sub-channel 2422, or both the first sub-channel 2421 and the second sub-channel 2422 can be provided with the first outlet 2431.

[0133] Alternatively, please refer to Figure 9 and Figure 10 Multiple first outlets 2431 are provided on both the first sub-channel 2421 and the second sub-channel 2422.

[0134] Please refer to Figure 8 An arc-shaped guide section 247 is provided between the first outlet 2431 and the bottom wall 2423 of the second guide channel 242.

[0135] The first outlet 2431 is a notch structure that at least penetrates the outer wall 2425 of the second guide channel 242. In this way, the medium in the second guide channel 242 flows out directly from the notch in the outer wall 2425 and flows downward along the thickness direction of the insulating member 24 into the gap between the outer shell 21 and the electrode assembly 22. The medium flows out more smoothly and there is less medium accumulation in the second guide channel 242.

[0136] According to some embodiments of this application, please refer to Figure 11 The outlet 243 includes a second outlet 2432, which is a through hole structure that penetrates the bottom wall 2423. The second outlet 2432 is at least provided in the first sub-channel 2421.

[0137] The orifice of the second outlet 2432 can be of various shapes, such as circular, elliptical, or square. Optionally, the orifice of the second outlet 2432 can be circular.

[0138] The second outlet 2432 is provided at least in the first sub-channel 2421, which means that the first sub-channel 2421 can be provided with a second outlet 2432. Of course, the second sub-channel 2422 can also be provided with a second outlet 2432.

[0139] Alternatively, please refer to Figure 11 The first sub-channel 2421 is provided with a second outlet 2432, and the second sub-channel 2422 is provided with a first outlet 2431.

[0140] The second outlet 2432 is designed as a through hole structure that penetrates the bottom wall 2423. The medium in the second guide channel 242 can flow directly from the through hole structure on the bottom wall 2423 into the gap between the outer shell 21 and the electrode assembly 22. The medium flows out more smoothly, and the medium is less likely to accumulate in the second guide channel 242.

[0141] According to some embodiments of this application, please refer to Figure 7 The insulating member 24 includes a body 245 and a flange 246. The flange 246 is disposed around the edge of the body 245, and a second guide groove 242 is formed between the flange 246 and the body 245. In the thickness direction of the first wall 212, the height of the body 245 protruding from the bottom surface of the second guide groove 242 is greater than the height of the flange 246 protruding from the bottom surface of the second guide groove 242.

[0142] A flange 246 is disposed around the edge of the body 245, and the flange 246 forms the edge of the insulating element 24. The flange 246 protrudes from the body 245 toward the first wall 212, and the flange 246 can confine the medium within the space enclosed by the body 245 and the flange 246.

[0143] The height of the body 245 protruding from the bottom surface of the second guide channel 242 is greater than the height of the flange 246 protruding from the bottom surface of the second guide channel 242. This means that the protrusion height of the body 245 relative to the bottom surface of the second guide channel 242 is greater than the protrusion height of the flange 246 protruding from the bottom surface of the second guide channel 242.

[0144] When the injection speed of the medium in the second guide channel 242 is too fast, the discharge speed of the medium at the outlet 243 on the second guide channel 242 is less than the injection speed of the medium. The height of the body 245 protruding from the bottom surface of the second guide channel 242 is greater than the height of the flange 246 protruding from the bottom surface of the second guide channel 242. That is, the flange 246 protrudes less than the body 245. Excess medium that cannot be discharged in the second guide channel 242 will overflow from the top surface of the flange 246, which accelerates the discharge speed of the medium, reduces the risk of the medium overflowing onto the body 245, and provides corresponding protection for the components on the body 245.

[0145] Based on some embodiments of this application, please continue to refer to Figure 7 Along the flow direction of the medium in the first guide channel 241, the width of the first guide channel 241 gradually increases.

[0146] As the width of the first guide channel 241 gradually increases, it can disperse the medium and slow down the medium flow rate, allowing the medium to enter the second guide channel 242 more smoothly.

[0147] According to some embodiments of this application, please refer to Figure 4 Along the first direction X, the projection of the medium injection port 2121 on the insulating member 24 is located within the first guide groove 241.

[0148] The projection of the medium injection port 2121 on the insulating member 24 is located within the first guide groove 241. This means that the medium injection port 2121 and the first guide groove 241 correspond in the thickness direction of the first wall 212. When the medium is injected into the battery cell 20 from the medium injection port 2121, the medium can be received by the first guide groove 241.

[0149] The projection of the medium injection port 2121 on the insulating member 24 is located within the first guide groove 241, which facilitates the first guide groove 241 to directly receive the medium injected by the medium injection port 2121 and disperse the medium.

[0150] According to some embodiments of this application, please refer to Figure 7 The first guide channel 241 has a first channel bottom surface that is disposed opposite to the inner surface of the first wall 212. The first channel bottom surface is provided with a first clearance groove 2411. The first clearance groove 2411 is recessed in the direction away from the inner surface of the first wall 212. The first clearance groove 2411 and the medium injection port 2121 are disposed opposite to each other along the first direction X.

[0151] The first clearance groove 2411 on the first flow guide groove 241 provides clearance for the fasteners connecting the first wall 212 and the insulating component 24, facilitating the assembly of the first wall 212 and the insulating component 24. Furthermore, the first clearance groove 2411 is positioned opposite the medium injection port 2121. The medium injected through the medium injection port 2121 first flows into the first clearance groove 2411 and then is guided from the first clearance groove 2411 into the first flow guide groove 241. The first clearance groove 2411 acts as a buffer for the medium, reducing the risk of medium splashing.

[0152] According to some embodiments of this application, please refer to Figure 7 The first clearance groove 2411 has a second groove bottom surface that is disposed opposite to the inner surface of the first wall 212. The second groove bottom surface is provided with a first through hole 2412, which penetrates the insulating member 24 along the first direction X.

[0153] The size of the first through hole 2412 is smaller than the size of the fastener, which prevents the fastener from falling into the battery cell. The size of the first through hole 2412 is smaller than the size of the medium injection port.

[0154] The first through hole 2412 on the first clearance groove 2411 serves two purposes. First, the first through hole 2412 allows a portion of the medium injected from the medium injection port 2121 to flow directly into the interior of the electrode assembly 22 without passing through the first guide groove 241, thus increasing the liquid inlet path for the medium to enter the battery cell 20. Second, the first through hole 2412 ensures that no medium residue remains in the first clearance groove 2411, reducing the risk of corrosion of the battery cell 20 due to medium residue inside the insulating component 24.

[0155] This application also provides a battery device, which includes the battery cell 20 of any of the foregoing embodiments.

[0156] This application also provides an electrical device, which includes a battery cell 20 from any of the foregoing embodiments, and is used to provide electrical energy.

[0157] In some embodiments, please refer to Figures 3 to 11The battery cell 20 includes a housing 21, an electrode assembly 22, and an insulating component 24. The housing 21 includes a first wall 212, a second wall 213, and a side wall 211. The first wall 212 and the second wall 213 are arranged opposite to each other along a first direction X. The side wall 211 surrounds the second wall 213. One end of the side wall 211 is connected to the first wall 212, and the other end of the side wall 211 is connected to the second wall 213. The first wall 212 is provided with a medium injection port 2121. The electrode assembly 22 is disposed inside the housing 21. The electrode assembly 22 has a first side surface 221 facing the side wall 211. A gap is formed between the first side surface 221 and the inner surface of the housing 21. An insulating member 24 is disposed between the first wall 212 and the electrode assembly 22. The insulating member 24 has a first guide groove 241 and a second guide groove 242 that communicate with each other on the side facing the first wall 212. The first guide groove 241 guides the medium injected through the medium injection port 2121 to the second guide groove 242. The second guide groove 242 is disposed at the edge of the insulating member 24 and surrounds its circumference. The insulating member 24 has an outlet 243 that connects the interior and exterior of the second guide groove 242. On the same projection plane perpendicular to the first direction X, the orthographic projection of the outlet 243 falls within the orthographic projection of the gap. The insulating member 24 has a second side surface 244 facing the side wall 211, and the outlet 243 is disposed on the second side surface 244. On the same projection plane perpendicular to the first direction X, the orthographic projection of the second side surface 244 falls within the orthographic projection of the gap. There are multiple outlets 243, which are distributed at intervals along the extension direction of the second guide channel 242.

[0158] On the same projection plane perpendicular to the first direction X, the orthographic projection of the outlet 243 falls within the orthographic projection of the gap. The medium flowing out of the outlet 243 can pass through the gap between the electrode assembly 22 and the outer casing 21, and flow along the inner surface of the outer casing 21 into the bottom side of the electrode assembly 22 inside the outer casing 21. On the one hand, due to the existence of the gap between the electrode assembly 22 and the inner surface of the outer casing 21, the resistance encountered by the medium when injecting into the battery cell 20 is smaller, which can improve the liquid injection efficiency of the medium. On the other hand, after the medium flows into the bottom side of the electrode assembly 22 inside the outer casing 21, the medium wets from the bottom of the electrode assembly 22 upwards. The medium can more uniformly wet the electrode assembly 22 inside the battery cell 20, improving the consistency of the battery cell wetting effect and improving the wetting effect of the medium on the electrode assembly 22. Furthermore, the medium employs a bottom-up wetting method, which reduces the risk of residual gas trapped inside the battery cell due to liquid sealing during the liquid injection and settling process of the battery cell 20, thereby improving the reliability of the battery cell 20. The medium in the second guide channel 242 flows directly out from the outlet 243 on the second side 244 of the insulating component 24 and enters the gap between the outer shell 21 and the electrode assembly 22 along the inner wall of the outer shell 21, achieving wetting of the electrode assembly 22. This reduces the risk of the medium directly affecting the electrode assembly 22 when it enters the battery cell. The multiple outlets 243 work together to make the discharge speed of the medium in the second guide channel 242 faster, allowing the medium to flow into the interior of the battery cell 20 more quickly. Moreover, the joint discharge of the medium from multiple outlets 243 disperses the fluid pressure of the medium injection, reducing the risk of the medium escaping from the second guide channel 242 due to slow discharge speed, and improving the liquid injection efficiency.

[0159] In some embodiments, the second flow channel 242 includes two first sub-flow channels 2421 and two second sub-flow channels 2422. The two first sub-flow channels 2421 are located on opposite sides of the insulating member 24 in the second direction Y, and the first sub-flow channels 2421 are connected to the first flow channel 241. The two second sub-flow channels 2422 are located on opposite sides of the insulating member 24 in the third direction Z, and the two ends of the second sub-flow channels 2422 are respectively connected to the two first sub-flow channels 2421. A plurality of outlets 243 are disposed in the first sub-flow channels 2421 and / or the second sub-flow channels 2422. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The second sub-flow channel 2422 includes two branch channels 24221. Both branch channels 24221 are connected to the first flow channel 241. The opposite ends of the two branch channels 24221 are respectively connected to the two first sub-flow channels 2421, and the opposite ends of the two branch channels 24221 are not connected. The second guide channel 242 has a bottom wall 2423, an inner side wall 2424 and an outer side wall 2425. The outer side wall 2425 and the inner side wall 2424 are arranged opposite to each other. The outer side wall 2425 is arranged closer to the side wall 211 of the outer shell 21 than the inner side wall 2424. The outlet 243 is arranged on the outer side wall 2425 and / or the bottom wall 2423 and penetrates the insulating member 24 along the first direction X.

[0160] The medium entering the first guide channel 241 first flows into the two first sub-channels 2421 on both sides of the second direction Y on the insulating member 24, and then flows into the two second sub-channels 2422 on both sides of the third direction Z on the insulating member 24. The first sub-channels 2421 and the second sub-channels 2422 are arranged around the edge of the insulating member 24, which increases the flow path of the medium in the edge direction of the insulating member 24, which is more conducive to the smooth flow of the medium. It also disperses and buffers the fluid pressure of the pressurized injection, allowing the medium to enter the interior of the battery cell 20 from all directions of the edge of the insulating member 24, improving the injection efficiency of the medium and the wetting effect on the electrode assembly 22. The bottom wall 2423 serves to support the medium. The outer side wall 2425 and the inner side wall 2424 are arranged opposite to each other on both sides of the bottom wall 2423. The outer side wall 2425 and the inner side wall 2424 serve to constrain the medium and guide the medium to flow along the extension direction of the second guide channel 242. The outlet 243 is provided on the outer side wall 2425 and / or the bottom wall 2423, and penetrates the insulating member 24 along the first direction X. After the medium in the second guide groove 242 flows out from the outlet 243 along the thickness direction of the insulating member 24, it flows into the gap between the electrode assembly 22 and the outer shell 21.

[0161] In some embodiments, the outlet 243 includes a first outlet 2431, which is a notch structure that penetrates at least the outer side wall 2425 along a first direction X. The first outlet 2431 is disposed in a first sub-channel 2421 and / or a second sub-channel 2422. The outlet 243 also includes a second outlet 2432, which is a through-hole structure that penetrates the bottom wall 2423. The second outlet 2432 is disposed in at least the first sub-channel 2421. Along the flow direction of the medium in the first guide groove 241, the width of the first guide groove 241 gradually increases.

[0162] The first outlet 2431 is a notch structure that penetrates at least the outer wall 2425 of the second guide channel 242. This allows the medium in the second guide channel 242 to flow directly out from the notch in the outer wall 2425 and flow downwards along the thickness direction of the insulating member 24 into the gap between the outer shell 21 and the electrode assembly 22. This results in smoother medium flow and reduces the likelihood of medium accumulation in the second guide channel 242. Alternatively, the second outlet 2432 can be a through-hole structure that penetrates the bottom wall 2423. This allows the medium in the second guide channel 242 to flow directly into the gap between the outer shell 21 and the electrode assembly 22 from the through-hole structure in the bottom wall 2423, further improving the smoothness of medium flow and reducing the likelihood of medium accumulation in the second guide channel 242.

[0163] In some embodiments, along the first direction X, the projection of the medium injection port on the insulating member 24 is located within the first guide groove 241. The first guide groove 241 has a first groove bottom surface disposed opposite to the inner surface of the first wall 212, and a first clearance groove 2411 is provided on the first groove bottom surface. The first clearance groove 2411 is recessed in a direction away from the inner surface of the first wall 212, and the first clearance groove 2411 is disposed opposite to the medium injection port 2121. The first clearance groove 2411 has a second groove bottom surface disposed opposite to the inner surface of the first wall 212, and a first through hole 2412 is provided on the second groove bottom surface. The first through hole 2412 penetrates the insulating member 24 along the first direction X.

[0164] The projection of the medium injection port 2121 onto the insulating member 24 is located within the first guide groove 241, facilitating the direct reception of the medium injected through the medium injection port and ensuring medium dispersion. The first clearance groove 2411 on the first guide groove 241 provides clearance for the fasteners connecting the first wall 212 and the insulating member 24, facilitating the assembly of the first wall 212 and the insulating member 24. Furthermore, the first clearance groove 2411 is positioned opposite the medium injection port 2121, allowing the medium injected through the medium injection port 2121 to first flow into the first clearance groove 2411 before being guided from the first clearance groove 2411 into the first guide groove. The first clearance groove 2411 acts as a buffer for the medium, reducing the risk of medium splashing. The first through hole 2412 on the first clearance groove 2411 serves two purposes. First, the first through hole 2412 allows a portion of the medium injected from the medium injection port to enter the interior of the electrode assembly 22 directly without passing through the first guide groove 241, increasing the liquid inlet path for the medium to enter the battery cell 20. Second, the first through hole 2412 ensures that no medium residue remains in the first clearance groove 2411, reducing the risk of corrosion of the battery cell 20 due to medium residue inside the insulating component 24.

[0165] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a first wall, a second wall, and a side wall. The first wall and the second wall are disposed opposite each other along a first direction. The side wall surrounds the second wall. One end of the side wall is connected to the first wall, and the other end of the side wall is connected to the second wall. The first wall is provided with a medium injection port. An electrode assembly is disposed within the housing, the electrode assembly having a first side facing the sidewall, and a gap is formed between the first side and the inner surface of the housing; An insulating element is disposed between the first wall and the electrode assembly; The insulating component has a first flow guide groove and a second flow guide groove that are interconnected on the side facing the first wall. The first flow guide groove is used to guide the medium injected by the medium injection port to the second flow guide groove. The second flow guide groove is disposed on the edge of the insulating component and is arranged around the circumference of the insulating component. The insulating component has an outlet that connects the inside and outside of the second flow guide groove. On the same projection plane perpendicular to the first direction, the orthographic projection of the outlet falls into the orthographic projection of the gap.

2. The battery cell according to claim 1, characterized in that, The insulating member has a second side facing the sidewall, and the outlet is disposed on the second side. On the same projection plane perpendicular to the first direction, the orthographic projection of the second side falls within the orthographic projection of the gap.

3. The battery cell according to claim 1, characterized in that, The number of outlets is multiple, and the multiple outlets are distributed at intervals along the extension direction of the second guide channel.

4. The battery cell according to claim 3, characterized in that, The second flow channel includes two first sub-flow channels and two second sub-flow channels. The two first sub-flow channels are located on opposite sides of the insulating member in a second direction and are connected to the first flow channel. The two second sub-flow channels are located on opposite sides of the insulating member in a third direction and are connected to the two first sub-flow channels at both ends. A plurality of outlets are disposed in the first sub-flow channels and / or the second sub-flow channels. The first direction, the second direction and the third direction are perpendicular to each other.

5. The battery cell according to claim 4, characterized in that, The second sub-channel includes two branch channels, with the opposite ends of the two branch channels respectively connected to the two first sub-channels, and the opposite ends of the two branch channels not connected.

6. The battery cell according to claim 4, characterized in that, The second guide channel includes a bottom wall, an inner side wall, and an outer side wall. The outer side wall and the inner side wall are arranged opposite to each other. The outer side wall is arranged closer to the side wall of the outer shell than the inner side wall. The outlet is arranged on the outer side wall and / or the bottom wall and penetrates the insulating member.

7. The battery cell according to claim 6, characterized in that, The outlet includes a first outlet along the first direction. The first outlet is a notch structure that at least penetrates the outer side wall. The first outlet is disposed in the first sub-channel and / or the second sub-channel.

8. The battery cell according to claim 6, characterized in that, The outlet includes a second outlet, which is a through-hole structure that penetrates the bottom wall, and the second outlet is at least located in the first sub-channel.

9. The battery cell according to claim 1, characterized in that, The insulating component includes a body and a flange. The flange is disposed around the edge of the body, and a second flow guide groove is formed between the flange and the body. In the thickness direction of the first wall, the height of the body protruding from the bottom surface of the second flow guide groove is greater than the height of the flange protruding from the bottom surface of the second flow guide groove.

10. The battery cell according to claim 1, characterized in that, Along the flow direction of the medium in the first guide channel, the width of the first guide channel gradually increases.

11. The battery cell according to claim 1, characterized in that, Along the first direction, the projection of the medium injection port on the insulating member is located within the first flow guide groove.

12. The battery cell according to claim 11, characterized in that, The first guide channel has a first channel bottom surface that is disposed opposite to the inner surface of the first wall. The first channel bottom surface is provided with a first clearance groove. The first clearance groove is recessed in a direction away from the inner surface of the first wall. The first clearance groove and the medium injection port are disposed opposite to each other along the first direction.

13. The battery cell according to claim 12, characterized in that, The first clearance groove has a second groove bottom surface disposed opposite to the inner surface of the first wall, and the second groove bottom surface is provided with a first through hole, which penetrates the insulating member along the first direction.

14. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-13.

15. An electrical appliance, characterized in that, The device includes a battery cell as described in any one of claims 1-13, and the electrical device is used to provide electrical energy.

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