Battery cell, battery device, and electric device
Patent Information
- Application Number
- CN202521635540.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-01
- Publication Date
- 2026-09-08
- Estimated Expiration
- 2035-08-01
AI Technical Summary
[0042]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.
Smart Images
Figure CN224732769U_ABST
Abstract
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] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.
[0003] In the development of battery cell technology, in addition to improving the performance of battery cells, their reliability is also a crucial consideration. Therefore, improving the reliability of battery cells is a continuous challenge in battery cell technology. Utility Model Content
[0004] This application provides a battery cell, a battery device, and an electrical device, which helps to improve the reliability of the battery cell.
[0005] This application is achieved through the following technical solution:
[0006] In a first aspect, the battery cell provided in this application includes a casing, an electrolyte, an electrode assembly, and a support member, with the electrolyte contained within the casing. The electrode assembly is contained within the casing and includes an electrode body and a tab, with the tab extending from the end of the electrode body along a first direction. The support member is disposed on the side of the electrode body opposite to the tab, and the side of the support member facing the electrode body has a groove extending inward from the edge of the support member perpendicular to the first direction, and has a fluid inlet penetrating the edge of the support member.
[0007] The battery cell provided in this application embodiment has a groove on the side of the support member facing the electrode body. The groove extends inward from the edge of the support member perpendicular to the first direction. In this way, during the cyclic operation of the electrode assembly, the groove has a guiding function, which can guide the electrolyte from the edge of the support member to the interior through the fluid inlet of the groove, thereby improving the wettability of the electrolyte to the non-edge area of the electrode assembly. During the cyclic operation of the electrode assembly, it is beneficial to increase the rate at which the non-edge area of the electrode assembly absorbs electrolyte, and reduce the risk that the cycle performance of the electrode assembly will be affected by insufficient electrolyte during the cycle. Thus, it is beneficial to improve the reliability of the battery cell.
[0008] According to some embodiments of this application, the groove is provided by the support member extending inward from the edge of the second direction, the second direction being perpendicular to the first direction, the dimension of the support member along the second direction being D, and the maximum dimension of the groove along the second direction being d, where d≥0.25D.
[0009] In the above scheme, by setting d≥0.25D, it is beneficial to increase the wetting range of the electrolyte in the non-edge area of the electrode assembly, further reduce the risk of the electrode assembly's cycle performance being affected by insufficient electrolyte wetting, and further improve the reliability of the battery cell.
[0010] According to some embodiments of this application, d ≥ 0.5D.
[0011] In the above scheme, the electrolyte in the groove can wet the central area of the electrode assembly along the second direction on the side facing the support, which further improves the wettability of the electrolyte to the electrode assembly and thus improves the cycle performance of the battery assembly.
[0012] According to some embodiments of this application, along the first direction, the maximum dimension of the groove is h, and the dimension of the support member is e, satisfying: 0.1mm≤h≤e-0.1mm.
[0013] In the above scheme, by setting 0.1mm≤h≤e-0.1mm, it is beneficial to improve the wettability of the electrolyte to the electrode assembly, while also improving the structural strength of the support and facilitating the processing of the support.
[0014] According to some embodiments of this application, the support member has a first surface that abuts against the electrode body, the total area of the first surface is S1, and the surface area of the electrode assembly facing the support member is S, where 20% ≤ S1 / S ≤ 80%.
[0015] In the above scheme, by setting 20%≤S1 / S≤80%, the support stability of the support component for the electrode assembly is improved, the risk of stress concentration in the electrode assembly is reduced, and the wettability of the electrolyte in the groove to the electrode assembly is also improved, which further improves the reliability of the battery cell.
[0016] According to some embodiments of this application, at least one groove has at least two fluid inlets located on opposite sides of the support perpendicular to the first direction.
[0017] In the above scheme, at least one groove penetrates the edges of the support member perpendicular to the first direction on opposite sides, so that the electrolyte enters into the groove through two fluid inlets arranged opposite to each other on the support member. This helps to further reduce the electrolyte creep distance, increase the electrolyte wetting rate of the electrode assembly, and reduce the risk that the electrode assembly will be affected by insufficient electrolyte in terms of cycle performance.
[0018] According to some embodiments of this application, the support member includes a plurality of grooves that penetrate the edges of the support member on both sides of the second direction and are spaced apart along the third direction, with the first direction, the second direction and the third direction being perpendicular to each other.
[0019] In the above scheme, the electrolyte can wet more areas of the electrode assembly along the second and third directions, which is beneficial to further improve the electrolyte immersion rate into the electrode assembly, reduce the electrolyte creep distance, further improve the wettability of the electrolyte to the electrode assembly, and thus improve the cycle performance of the electrode assembly.
[0020] According to some embodiments of this application, along a third direction, the minimum distance d1 between two adjacent grooves satisfies: 1mm≤d1≤10mm.
[0021] In the above scheme, by setting 1mm≤d1≤10mm, it is beneficial to improve the wettability and uniformity of the electrolyte to the electrode assembly, while also facilitating the manufacturing of the support component.
[0022] According to some embodiments of this application, the dimension of the support member along a third direction is greater than the dimension along a second direction.
[0023] In the above scheme, the electrolyte can enter the groove through multiple fluid inlets from the end of the support member along the second direction, thereby reducing the electrolyte creep distance and increasing the electrolyte wetting rate of the electrode assembly.
[0024] According to some embodiments of this application, one of the grooves is provided in a spiral shape extending in a direction perpendicular to the first direction.
[0025] The above scheme is beneficial to increasing the wetting area of the electrolyte in the groove on the electrode assembly and the uniformity of wetting of the electrode assembly, which is further beneficial to improving the cycle performance of the battery assembly.
[0026] According to some embodiments of this application, at least one groove extends in a curved manner along a direction perpendicular to the first direction.
[0027] In the above scheme, the extension direction and extension path of the groove can be reasonably set as needed to improve the wettability and uniformity of the electrolyte on the electrode assembly, thereby improving the cycle performance of the electrode assembly.
[0028] According to some embodiments of this application, at least one groove extends in a wavy manner along a direction perpendicular to the first direction.
[0029] The above scheme helps to improve the uniformity of electrolyte wetting of different areas of the electrode assembly within the groove, thereby improving the cycle performance of the electrode assembly.
[0030] According to some embodiments of this application, the support member has a plurality of wavy grooves extending in a wave-like manner, with at least two adjacent grooves protruding in opposite directions along the extension direction.
[0031] The above solution is beneficial to improving the impact resistance of the support components, and reduces the risk of deformation of the support components when the battery cells are subjected to vibration or impact loads.
[0032] According to some embodiments of this application, the width of the groove along the direction perpendicular to the first direction and its own extension direction is b, and the width b of the groove gradually decreases from the fluid inlet of the groove inward.
[0033] In the above scheme, the groove forms a certain capillary effect on the electrolyte, so as to guide the electrolyte to flow into the groove more quickly and smoothly through the fluid inlet, which facilitates the timely wetting of the middle area of the electrode assembly by the electrolyte, and is beneficial to improving the wettability and wetting rate of the electrode assembly by the electrolyte.
[0034] According to some embodiments of this application, the dimension of the groove along the first direction is h, and the dimension h of the groove gradually decreases from the fluid inlet of the groove inward.
[0035] In the above scheme, the groove forms a capillary effect on the electrolyte, which facilitates the electrolyte to flow more quickly into the groove through the fluid inlet. This improves the wettability of the electrolyte to the electrode assembly and also helps to increase the wetting rate of the electrolyte to the electrode assembly.
[0036] According to some embodiments of this application, the groove includes a first flow channel and a plurality of second flow channels. The first flow channel extends inward from the edge of the support member perpendicular to the first direction. The plurality of second flow channels are respectively connected to the first flow channel and extend inward. The width b of the second flow channel is smaller than the width b of the first flow channel.
[0037] The above scheme is beneficial to improving the wetting rate of the electrolyte in the non-edge areas of the electrode assembly, and also to improving the wettability of the electrolyte in the non-edge areas of the electrode assembly.
[0038] Secondly, the battery device provided in the embodiments of this application includes the battery cell provided in any of the above embodiments.
[0039] The battery device provided in this application has the same technical effect as the battery cell provided in any of the above embodiments, and will not be described again here.
[0040] Thirdly, the electrical device provided in the embodiments of this application includes the battery device provided in any of the above embodiments, and the battery device is used to provide electrical energy.
[0041] The electrical device provided in this application embodiment has the same technical effect as the battery device provided in this application embodiment, and will not be described again here.
[0042] 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
[0043] 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.
[0044] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application;
[0045] Figure 2 This is a schematic diagram of the structure of the battery device provided in the embodiments of this application;
[0046] Figure 3 This is a schematic diagram of the structure of a battery cell assembly in a battery device provided in an embodiment of this application;
[0047] Figure 4 This is a schematic diagram of the exploded structure of a single battery cell provided in an embodiment of this application;
[0048] Figure 5 This is a schematic diagram of the structure of a support member in a battery cell provided in an embodiment of this application;
[0049] Figure 6 This is a cross-sectional structural diagram of the support member in a battery cell provided in an embodiment of this application;
[0050] Figure 7 This is a schematic diagram of another support component in a battery cell provided in an embodiment of this application;
[0051] Figure 8 A schematic diagram of another type of support member in a battery cell provided in an embodiment of this application;
[0052] Figure 9 This is a schematic diagram of a support structure in a battery cell provided in an embodiment of this application;
[0053] Figure 10 A top view of a support member in a battery cell provided in an embodiment of this application;
[0054] Figure 11 This is a top view of another type of support member in a battery cell provided in an embodiment of this application;
[0055] Figure 12 A top view of another support member in a battery cell provided in an embodiment of this application;
[0056] Figure 13 This is a top view of another type of support member in a battery cell provided in an embodiment of this application.
[0057] The accompanying drawings are not necessarily drawn to scale.
[0058] Explanation of reference numerals in the attached figures:
[0059] 1-Vehicle; 1a-Motor; 1b-Controller;
[0060] 10 - Battery assembly; 11 - Housing; 111 - First sub-housing; 112 - Second sub-housing;
[0061] 20-Battery cell module;
[0062] 30-Battery cell; 31-Casing; 311-Housing shell; 312-End cap; 32-Electrode assembly; 321-Electrode body; 322-Taper; 33-Electrode terminal;
[0063] 40 - Support; 41 - Groove; 41a - Fluid inlet; 411 - First flow channel; 412 - Second flow channel;
[0064] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation
[0065] 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.
[0066] 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.
[0067] 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.
[0068] 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.
[0069] 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.
[0070] 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).
[0071] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.
[0072] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.
[0073] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.
[0074] 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.
[0075] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.
[0076] 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.
[0077] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.
[0078] 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.
[0079] 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.
[0080] 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, reduces the risk of short circuits between them while allowing active ions to pass through.
[0081] 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.
[0082] 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.
[0083] 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.).
[0084] 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.
[0085] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.
[0086] 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.
[0087] 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.
[0088] 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.
[0089] 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.
[0090] 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.
[0091] 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.
[0092] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.
[0093] 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.
[0094] In some embodiments, the housing includes an end cap and a shell, the shell 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 shell may have one or more openings. The end cap may also be provided one or more times.
[0095] 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.
[0096] 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.
[0097] As an example, the battery cell can be a prismatic battery cell, which includes 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.
[0098] During the operation of a battery cell, the electrode assembly cyclically absorbs and releases electrolyte. However, in related technologies, the end of the electrode assembly away from the tab is attached to a support to provide good support for the electrode assembly. As a result, during the absorption of electrolyte, there is a risk that the area where the electrode assembly is attached to the support may not absorb enough electrolyte. This leads to low electrolyte wettability of the electrode assembly during cyclic operation, and the electrode assembly is at risk of lithium plating when there is insufficient electrolyte. This seriously affects the cycle performance of the electrode assembly and the reliability of the battery cell.
[0099] In view of this, the battery cell provided in this application embodiment includes a casing, an electrolyte, an electrode assembly, and a support member, with the electrolyte contained within the casing. The electrode assembly is contained within the casing and includes an electrode body and a tab, with the tab extending from the end of the electrode body along a first direction. The support member is disposed on the side of the electrode body opposite to the tab, and the side of the support member facing the electrode body has a groove extending inward from the edge of the support member perpendicular to the first direction, and has a fluid inlet penetrating the edge of the support member.
[0100] The battery cell provided in this application embodiment has a groove on the side of the support member facing the electrode body. The groove extends inward from the edge of the support member perpendicular to the first direction. In this way, during the cyclic operation of the electrode assembly, the groove has a guiding function, which can guide the electrolyte from the edge of the support member to the interior through the fluid inlet of the groove, thereby improving the wettability of the electrolyte to the non-edge area of the electrode assembly. During the cyclic operation of the electrode assembly, it is beneficial to increase the rate at which the non-edge area of the electrode assembly absorbs electrolyte, and reduce the risk that the cycle performance of the electrode assembly will be affected by insufficient electrolyte during the cycle. Thus, it is beneficial to improve the reliability of the battery cell.
[0101] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices including battery cells, and electrical devices using battery devices.
[0102] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.
[0103] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.
[0104] For ease of explanation, the following embodiments will be described using a vehicle 1 as an example of an electrical device according to an embodiment of this application.
[0105] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1 provided in an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1, and the battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1; for example, the battery device 10 can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation of vehicle 1.
[0106] The vehicle 1 may also include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, for the power needs of the vehicle 1 during starting, navigation and driving.
[0107] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.
[0108] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in the embodiments of this application. Figure 3 This is a schematic diagram of the structure of the battery cell assembly 20 in the battery device 10 provided in this application embodiment. The battery device 10 includes a housing 11 and battery cells 30, with the battery cells 30 housed within the housing 11. The housing 11 provides a space for accommodating the battery cells 30, and the housing 11 can adopt various structures. In some embodiments, the housing 11 may include a first sub-housing 111 and a second sub-housing 112, which overlap each other, and together define a space for accommodating the battery cells 30. The second sub-box 112 can be a hollow structure with one end open, and the first sub-box 111 can be a plate-like structure. The first sub-box 111 covers the opening side of the second sub-box 112 so that the first sub-box 111 and the second sub-box 112 together define the accommodating space. Alternatively, the first sub-box 111 and the second sub-box 112 can both be hollow structures with one side open, and the opening side of the first sub-box 111 covers the opening side of the second sub-box 112.
[0109] In the battery device 10, there can be multiple battery cells 30, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 30 are connected in both series and parallel configurations. Multiple battery cells 30 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 30 is housed within the housing 11. Alternatively, the battery device 10 can also consist of multiple battery cells 30 first connected in series, parallel, or in a mixed manner to form a battery cell assembly 20, and then the multiple battery cell assemblies 20 are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 11. The battery device 10 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 30.
[0110] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.
[0111] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the exploded structure of a battery cell 30 provided in an embodiment of this application. Figure 4As shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and electrode terminals 33. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening 311a, and the end cap 312 closes the opening 311a to isolate the internal environment of the battery cell 30 from the external environment.
[0112] The housing 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can accommodate the electrode assembly 32, electrolyte, and other components. The housing 311 and the end cap 312 can be independent components. The housing 311 can have various shapes and sizes. Specifically, the shape of the housing 311 can be determined according to the specific shape and size of the electrode assembly 32. The housing 311 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.
[0113] End cap 312 refers to a component that covers the opening 311a of housing 311 to isolate the internal environment of battery cell 30 from the external environment. The shape of end cap 312 can be adapted to the shape of housing 311 to fit it. Optionally, end cap 312 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 312 is not easily deformed under pressure and impact, enabling battery cell 30 to have higher structural strength and improved reliability. Functional components such as electrode terminals 33 can be provided on end cap 312. Electrode terminals 33 can be used for electrical connection with electrode assembly 32 to output or input electrical energy to battery cell 30. The material of end cap 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 312. The insulating structure can be used to isolate the electrical connection components within the housing 311 from the end cap 312 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.
[0114] Electrode assembly 32 is the component in the battery cell 30 where electrochemical reactions occur. The housing 311 may contain one or more electrode assemblies 32. The electrode assembly 32 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates to separate them and prevent internal short circuits. The portions of the positive and negative electrode plates containing active material constitute the electrode body 321 of the electrode assembly 32, while the portions of the positive and negative electrode plates without active material each constitute a tab 322. The positive and negative tabs may be located together at one end of the electrode body 321 or separately at both ends of the electrode body 321. During the charging and discharging process of the battery cell 30, the positive and negative active materials react with the electrolyte, and the tabs 322 connect to the electrode terminals 33 to form a current loop.
[0115] Firstly, such as Figure 4 and Figure 5 As shown, the battery cell 30 provided in this embodiment includes a housing 31, an electrolyte, an electrode assembly 32, and a support member 40. The electrolyte is contained within the housing 31. The electrode assembly 32 is contained within the housing 31 and includes an electrode body 321 and a tab 322. The tab 322 extends from the end of the electrode body 321 along a first direction X. The support member 40 is disposed on the side of the electrode body 321 opposite to the tab 322. The side of the support member 40 facing the electrode body 321 has a groove 41. The groove 41 extends inward from the edge of the support member 40 perpendicular to the first direction X and has a fluid inlet 41a penetrating the edge of the support member 40.
[0116] During the cycle operation of the battery cell 30, lithium ions and other metal ions are repeatedly inserted and extracted between the positive and negative electrode plates. The electrolyte can serve as a transport channel for lithium ions and other metal ions inside the electrode assembly 32. Therefore, it is necessary to maintain good wettability of the electrolyte to the electrode assembly 32 in order to facilitate the transport of lithium ions and other metal ions.
[0117] The support member 40 is located on the side of the electrode body 321 away from the tab 322. The support member 40 is located between the electrode assembly 32 and the housing 31. Since the housing 31 may include the end cap 312 of the housing 311, the support member 40 may be located between the wall of the housing 311 and the end cap 312 on the opposite side and the electrode body 321. Of course, the support member 40 may also be located between the end cap 312 and the electrode body 321. The specific choice can be made according to actual needs.
[0118] The support member 40 is located on the side of the electrode body 321 away from the tab 322. The support member 40 can fit against the electrode body 321 to provide good support for the electrode assembly 32.
[0119] The support member 40 has a groove 41 on the side facing the electrode body 321, and the groove 41 has an opening facing the electrode body 321. The groove 41 is provided to extend inward from the edge of the support member 40 perpendicular to the first direction X, and has a fluid inlet 41a penetrating the edge of the support member 40. In this way, the electrolyte located between the electrode assembly 32 and the wall of the housing 31 inside the housing 31 can flow into the interior of the groove 41 through the fluid inlet 41a on the edge of the support member 40, along the extending direction of the groove 41.
[0120] During the cyclic operation of the electrode assembly 32, the electrolyte in the groove 41 can be absorbed by the electrode assembly 32 through the opening of the groove 41 facing the electrode body 321, and gradually wet the side of the electrode body 321 facing the support 40 towards the side of the electrode body 321 facing the tab 322. In this way, the electrolyte can be absorbed more efficiently by the non-edge area of the electrode assembly 32 through the groove 41, which helps to reduce the electrolyte creep distance and improve the wettability of the electrolyte to the non-edge area of the electrode assembly 32.
[0121] Optionally, the support member 40 may have one, two, or more grooves 41, each groove 41 having a fluid inlet 41a extending through the edge of the support member 40. Optionally, the same groove 41 may have one or two fluid inlets 41a, meaning fluid can enter the groove 41 through one or more fluid inlets 41a. Different fluid inlets 41a of the same groove 41 may be located on the same side of the support member 40, or different fluid inlets 41a of the same groove 41 may be located on opposite or intersecting sides of the support member 40. Similarly, fluid inlets 41a of different grooves 41 may be located on the same side of the support member 40, or fluid inlets 41a of different grooves 41 may be located on opposite or intersecting sides of the support member 40.
[0122] Alternatively, different grooves 41 may be interconnected inside the support member 40, or different grooves 41 may not be interconnected inside the support member 40, but may be interconnected only through the area outside the support member 40.
[0123] The groove 41 has a support member 40 extending inward from the edge perpendicular to the first direction X. Optionally, the groove 41 can extend in a straight line, or it can extend in a curved line. The groove 41 can extend in a regular shape, or it can extend in an irregular shape.
[0124] Optionally, the depth of the same groove 41 along the first direction X can be a fixed value, or the depth of different grooves 41 along the first direction X can gradually change, that is, the bottom wall of the groove 41 can be planar, or the bottom wall of the groove 41 can be curved. Different grooves 41 can have the same depth along the first direction X, or different grooves 41 can be provided with different shapes or different depths along the first direction X.
[0125] The straight-line distance between the extension depth of the groove 41 and the fluid inlet 41a of the groove 41 can be any suitable value. For example, the groove 41 extends from the edge of the support 40 to one-quarter, one-third, or one-half of the total dimension in a direction perpendicular to the thickness direction. When the groove 41 extends to half of the total dimension in a direction perpendicular to the thickness direction, the electrolyte in the groove 41 can wet half of the area of the electrode assembly 32 in that direction, especially the central area of the electrode assembly 32 in that direction.
[0126] The battery cell 30 provided in this application embodiment has a groove 41 on the side of the support member 40 facing the electrode body 321. The groove 41 extends inward from the edge of the support member 40 perpendicular to the first direction X. In this way, during the cyclic operation of the electrode assembly 32, the groove 41 has a guiding function, which can guide the electrolyte from the edge of the support member 40 to the interior through the fluid inlet 41a of the groove 41, thereby improving the wettability of the electrolyte to the non-edge area of the electrode assembly 32. During the cyclic operation of the electrode assembly 32, it is beneficial to increase the rate at which the non-edge area of the electrode assembly 32 absorbs electrolyte, and reduce the risk that the cycle performance of the electrode assembly 32 will be affected due to insufficient electrolyte during the cycle. Thus, it is beneficial to improve the reliability of the battery cell 30.
[0127] In some embodiments, the groove 41 is provided by the support member 40 extending inward along the edge of the second direction Y, the second direction Y being perpendicular to the first direction X, the dimension of the support member 40 along the second direction Y being D, and the maximum dimension of the groove 41 along the second direction Y being d, where d≥0.25D.
[0128] Optionally, the second direction Y can be the direction in which the support member 40 has a larger size, or the second direction Y can be the direction in which the support member 40 has a smaller size.
[0129] The maximum dimension d of the groove 41 along the second direction Y is the maximum distance that the electrolyte can flow into the electrode assembly 32 after entering the groove 41 through the fluid inlet 41a. Optionally, d can be 0.25D, 0.3D, 0.4D, 0.45D, or 0.5D, etc.
[0130] Understandably, the higher the d / D value, the greater the wetting range of the electrolyte in the central region of the electrode assembly 32 after entering the groove 41 through the fluid inlet 41a. Therefore, by setting d ≥ 0.25D, it is beneficial to increase the wetting range of the electrolyte in the non-edge regions of the electrode assembly 32, further reducing the risk that insufficient electrolyte wetting will affect the cycle performance of the electrode assembly 32, and further improving the reliability of the battery cell 30.
[0131] In some embodiments, d ≥ 0.5D.
[0132] Optionally, d can be 0.5D, 0.55D, 0.6D, 0.65D, 0.6D, 0.75D, 0.8D, 0.85D, 0.9D or D, etc. In the case where d equals D, the groove 41 is provided to penetrate the support member 40 along the second direction Y.
[0133] In this way, the electrolyte in the groove 41 can wet the central region of the electrode assembly 32 on the side facing the support member 40 along the second direction Y, which further helps to improve the wettability of the electrolyte to the electrode assembly 32, thereby improving the cycle performance of the battery assembly.
[0134] In some embodiments, such as Figure 6 As shown, along the first direction X, the maximum dimension of the groove 41 is h, and the dimension of the support member 40 is e, satisfying: 0.1mm≤h≤e-0.1mm.
[0135] Optionally, h can be 0.1mm, 0.2mm, or e-0.1mm, etc.
[0136] It is understandable that the dimension h of the groove 41 along the first direction X is the depth of the groove 41. The larger h is, the greater the depth of the groove 41, which makes it easier for the groove 41 to accommodate more electrolyte. The smaller h is, the smaller the depth of the groove 41, and the higher the thickness of the area corresponding to the bottom wall of the support member 40 and the groove 41. This is more conducive to improving the structural strength of the support member 40 and facilitating the processing of the support member 40.
[0137] Therefore, by setting 0.1mm≤h≤e-0.1mm, it is beneficial to improve the wettability of the electrolyte to the electrode assembly 32, while also improving the structural strength of the support 40 and facilitating the processing of the support 40.
[0138] In some embodiments, the support member 40 has a first surface that abuts against the electrode body 321, the total area of the first surface is S1, and the surface area of the electrode assembly 32 facing the support member 40 is S, where 20% ≤ S1 / S ≤ 80%.
[0139] When the first surface of the support member 40 abuts against the electrode body 321, the first surface of the support member 40 and the electrode body 321 are in close contact. It is understood that an insulating member or the like can be provided between the support member 40 and the electrode body 321 to provide good insulation for the electrode assembly 32. Thus, the abutment between the support member 40 and the electrode body 321 can be either a direct abutment or an indirect abutment between the support member 40 and the electrode body 321 through an insulating member or the like.
[0140] Optionally, the first surface may be flat, or the first surface may be arc-shaped, etc. S1 / S may be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or 80%, etc.
[0141] It is understandable that the larger the value of S1 / S is to a certain extent, the larger the area of the part of the support 40 that abuts against the electrode assembly 32 will be. This is more conducive to improving the support stability of the support 40 on the electrode assembly 32 and reducing the risk of stress concentration in the electrode assembly 32. On the other hand, the smaller the value of S1 / S is to a certain extent, the more conducive it is to increasing the space occupied by the groove 41 in the support 40 to accommodate more electrolyte, thereby improving the wettability of the electrolyte on the electrode assembly 32.
[0142] Therefore, by setting 20%≤S1 / S≤80%, the support stability of the support member 40 on the electrode assembly 32 is improved, the risk of stress concentration in the electrode assembly 32 is reduced, and the wettability of the electrolyte in the groove 41 on the electrode assembly 32 is also improved, which further improves the reliability of the battery cell 30.
[0143] In some embodiments, such as Figure 5 , Figure 7 and Figure 8 As shown, at least one groove 41 has at least two fluid inlets 41a, which are located on opposite sides of the support 40 perpendicular to the first direction X.
[0144] Optionally, one or two grooves 41 may be provided with at least two fluid inlets 41a on opposite sides perpendicular to the first direction X. At least one groove 41 may have two, three or more fluid inlets 41a, while the other grooves 41 may be configured with the orientation and number of fluid inlets 41a as needed.
[0145] Thus, at least one groove 41 penetrates the edges of the support member 40 perpendicular to the first direction X on both opposite sides, so that the electrolyte enters into the groove 41 through the two fluid inlets 41a oppositely arranged on the support member 40. This helps to further reduce the electrolyte creep distance, increase the electrolyte wetting rate of the electrode assembly 32, and reduce the risk that the electrode assembly 32 will be affected by insufficient electrolyte in terms of cycle performance.
[0146] In some embodiments, such as Figure 5 , Figure 7 , Figure 8 and Figure 9 As shown, the support member 40 includes a plurality of grooves 41, which penetrate the edges of the support member 40 along the second direction Y and are spaced apart along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.
[0147] It is understandable that the multiple grooves 41 can be evenly spaced along the third direction Z, or the multiple grooves 41 can be spaced at random intervals along the third direction Z. The multiple grooves 41 can extend in a straight line or in a curved line along the second direction, which can be selected according to actual needs.
[0148] Optionally, the second direction Y can be the direction with a larger size of the support member 40, while the third direction Z is the direction with a smaller size of the support member 40, or the second direction Y is the direction with a smaller size of the support member 40, while the third direction Z is the direction with a larger size of the support member 40.
[0149] By setting multiple grooves 41 and setting multiple grooves 41 through the edges of the support member 40 in the second direction Y, each groove 41 has a fluid inlet 41a on both sides of the second direction Y. Electrolyte can enter the interior of each groove 41 through both ends of the second direction Y. Since multiple grooves 41 are distributed along the third direction Z, multiple grooves 41 can wet multiple areas of the electrode assembly 32 along the third direction Z.
[0150] Therefore, by setting multiple grooves 41 extending along the second direction Y and spaced apart along the third direction Z, the electrolyte can wet more areas of the electrode assembly 32 along the second direction Y and the third direction Z, which is beneficial to further improve the electrolyte immersion rate into the electrode assembly 32, reduce the electrolyte creep distance, further improve the wettability of the electrolyte to the electrode assembly 32, and thus improve the cycle performance of the electrode assembly 32.
[0151] In some embodiments, such as Figure 6 As shown, along the third direction Z, the minimum distance d1 between two adjacent grooves 41 satisfies: 1mm≤d1≤10mm.
[0152] Optionally, d1 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc.
[0153] Understandably, the smaller the value of d1, the higher the wettability of the electrolyte in the groove 41 to the electrode assembly 32, and the more beneficial it is to improving the uniformity of electrolyte wetting of the electrode assembly 32. Conversely, the larger the value of d1, the easier it is to manufacture the support member 40.
[0154] Therefore, by setting 1mm≤d1≤10mm, it is beneficial to improve the wettability and uniformity of the electrolyte to the electrode assembly 32, while also facilitating the manufacturing of the support 40.
[0155] In some embodiments, such as Figure 8 and Figure 9 As shown, the dimension of the support member 40 along the third direction Z is greater than the dimension along the second direction Y.
[0156] Since the groove 41 extends along the second direction Y, its size along the second direction Y is relatively small, which facilitates the fabrication of the support member 40. Furthermore, a greater number of grooves 41 can be provided along the third direction Z, allowing the electrolyte to enter the groove 41 from the end of the support member 40 along the second direction Y through multiple fluid inlets 41a, thereby reducing the electrolyte creep distance and increasing the electrolyte wetting rate of the electrode assembly 32.
[0157] In some embodiments, such as Figure 11 , Figure 12 and Figure 13 As shown, at least one groove 41 extends in a curved manner along a direction perpendicular to the first direction X.
[0158] Optionally, all grooves 41 can be configured to extend in a curved shape, or only some of the grooves 41 can be configured to extend in a curved shape. The shape of the extension of the grooves 41 can be regular or irregular, and the specific extension direction of the grooves 41 can be set as needed to provide electrolyte to the electrode assembly 32 at a specific location.
[0159] Therefore, by providing at least one groove 41 that extends in a curved manner along a direction perpendicular to the first direction X, it is convenient to reasonably set the extension direction and extension path of the groove 41 as needed, so as to improve the wettability and uniformity of the electrolyte on the electrode assembly 32, thereby improving the cycle performance of the electrode assembly 32.
[0160] In some embodiments, such as Figure 11 As shown, at least one groove 41 extends in a spiral shape along a direction perpendicular to the first direction X.
[0161] This helps to increase the wetting area of the electrolyte in the groove 41 on the electrode assembly 32, as well as the uniformity of wetting of the electrode assembly 32, which further helps to improve the cycle performance of the battery assembly.
[0162] In some embodiments, such as Figure 12 and Figure 13 As shown, at least one groove 41 extends in a wavy shape along a direction perpendicular to the first direction X.
[0163] This helps to improve the uniformity of electrolyte wetting of different areas of electrode assembly 32 within groove 41, thereby improving the cycle performance of electrode assembly 32.
[0164] In some embodiments, such as Figure 13 As shown, the support member 40 has a plurality of wavy grooves 41 extending in a wave-like manner, and at least two adjacent grooves 41 protrude in opposite directions along the extension direction.
[0165] This helps improve the impact resistance of the support member 40, and reduces the risk of deformation of the support member 40 when the battery cell 30 is subjected to vibration or impact loads.
[0166] In some embodiments, such as Figure 10 As shown, the width of the groove 41 along the direction perpendicular to the first direction X and its own extension direction is b. From the fluid inlet 41a of the groove 41 inward, the width b of the groove 41 gradually decreases.
[0167] Thus, from the fluid inlet 41a inward, along the extension direction perpendicular to the groove 41, the cross-sectional area of the groove 41 gradually decreases, and the groove 41 forms a certain capillary effect on the electrolyte.
[0168] Furthermore, the closer to the edge of the support member 40, the larger the width b of the groove 41; the farther away from the edge of the support member 40, the smaller the width b of the groove 41. The larger fluid inlet 41a facilitates the supply of sufficient electrode liquid into the groove 41. As the width b of the groove 41 gradually decreases from the fluid inlet 41a inward, the groove 41 forms a certain capillary effect on the electrolyte, guiding the electrolyte to flow into the groove 41 more quickly and smoothly through the fluid inlet 41a. This facilitates timely wetting of the middle area of the electrode assembly 32 by the electrolyte, which is beneficial to improving the wettability and wetting rate of the electrolyte on the electrode assembly 32.
[0169] In some embodiments, the dimension of the groove 41 along the first direction X is h, and the dimension h of the groove 41 gradually decreases from the fluid inlet 41a inward to the inside of the groove 41 along the first direction X.
[0170] Thus, from the fluid inlet 41a inward, along the extension direction perpendicular to the groove 41, the cross-sectional area of the groove 41 gradually decreases, and the groove 41 forms a certain capillary effect on the electrolyte.
[0171] Furthermore, the groove 41 has a large fluid inlet 41a, so that a sufficient amount of electrolyte can enter the groove 41 through the fluid inlet 41a. From the fluid inlet 41a inward, the size h of the groove 41 gradually decreases along the first direction X, so that the groove 41 can form a capillary effect on the electrolyte, which facilitates the electrolyte to flow more quickly into the groove 41 through the fluid inlet 41a. This improves the wettability of the electrolyte to the electrode assembly 32 and also helps to increase the wetting rate of the electrolyte to the electrode assembly 32.
[0172] In some embodiments, such as Figure 10 As shown, the groove 41 includes a first flow channel 411 and a plurality of second flow channels 412. The first flow channel 411 extends inward from the edge of the support member 40 perpendicular to the first direction X. The plurality of second flow channels 412 are respectively connected to the first flow channel 411 and extend inward respectively. The width b of the second flow channel 412 is smaller than the width b of the first flow channel 411.
[0173] In other words, from the fluid inlet 41a of the groove 41 inward, the groove 41 can branch into multiple branches in different areas. As the cross-sectional area of the groove 41 gradually decreases along the direction perpendicular to the extension direction from the fluid inlet 41a inward, by setting multiple second flow channels 412, it is possible to allow the electrolyte to flow inward through a sufficient number of spaces, so as to form a capillary effect on the electrolyte and facilitate a sufficient amount of electrolyte to flow into the interior of the groove 41 to wet the central region of the electrode assembly 32.
[0174] Therefore, this configuration is beneficial for increasing the wetting rate of the electrolyte in the non-edge regions of the electrode assembly 32, and also for improving the wettability of the electrolyte in the non-edge regions of the electrode assembly 32.
[0175] Secondly, the battery device 10 provided in the embodiments of this application includes the battery cell 30 provided in any of the above embodiments.
[0176] The battery device 10 provided in this application embodiment has the same technical effect as the battery cell 30 provided in any of the above embodiments, and will not be described again here.
[0177] Thirdly, the electrical device provided in the embodiments of this application includes the battery device 10 provided in the above embodiments, and the battery device 10 is used to provide electrical energy.
[0178] The electrical device provided in this application embodiment has the same technical effect as the battery device 10 provided in this application embodiment, and will not be described again here.
[0179] In some embodiments, such as Figures 4 to 13 As shown, the battery cell 30 includes a casing 31, an electrolyte, an electrode assembly 32, and a support member 40. The electrolyte is contained within the casing 31, and the electrode assembly 32 is also contained within the casing 31. The electrode assembly 32 includes an electrode body 321 and a tab 322. The tab 322 extends from the end of the electrode body 321 along a first direction X. The support member 40 is located on the side of the electrode body 321 opposite to the tab 322. The side of the support member 40 facing the electrode body has a groove 41. The groove 41 extends inward from the edge of the support member 40 perpendicular to the first direction X and has a fluid inlet 41a penetrating the edge of the support member 40. Along the first direction X, the maximum dimension of the groove 41 is h, and the dimension of the support member 40 is e, satisfying: 0.1mm ≤ h ≤ e - 0.1mm. The support member 40 has a first surface that abuts against the electrode body 321. The total area of the first surface is S1, and the surface area of the electrode assembly 32 facing the support member 40 is S, where 20% ≤ S1 / S ≤ 80%.
[0180] The battery cell 30 provided in this application embodiment has a groove 41 on the side of the support member 40 facing the electrode body 321. The groove 41 extends inward from the edge of the support member 40 perpendicular to the first direction X. In this way, during the cyclic operation of the electrode assembly 32, the groove 41 has a guiding function, which can guide the electrolyte from the edge of the support member 40 to the interior through the fluid inlet 41a of the groove 41, thereby improving the wettability of the electrolyte to the non-edge area of the electrode assembly 32. During the cyclic operation of the electrode assembly 32, it is beneficial to increase the rate at which the non-edge area of the electrode assembly 32 absorbs electrolyte, and reduce the risk that the cycle performance of the electrode assembly 32 will be affected due to insufficient electrolyte during the cycle. Thus, it is beneficial to improve the reliability of the battery cell 30.
[0181] 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: shell; Electrolyte, contained within the outer casing; An electrode assembly is housed within the housing. The electrode assembly includes an electrode body and a tab, the tab extending from an end of the electrode body along a first direction. A support member is provided on the side of the electrode body away from the tab. The side of the support member facing the electrode body has a groove. The groove extends inward from the edge of the support member perpendicular to the first direction and has a fluid inlet penetrating the edge of the support member.
2. The battery cell according to claim 1, characterized in that, The groove extends inward from the edge of the support member along the second direction, which is perpendicular to the first direction. The dimension of the support member along the second direction is D, and the maximum dimension of the groove along the second direction is d, where d ≥ 0.25D.
3. The battery cell according to claim 2, characterized in that, d≥0.5D.
4. The battery cell according to claim 1, characterized in that, Along the first direction, the maximum dimension of the groove is h, and the dimension of the support is e, satisfying: 0.1mm≤h≤e-0.1mm.
5. The battery cell according to claim 1, characterized in that, The support member has a first surface that abuts against the electrode body. The total area of the first surface is S1, and the surface area of the electrode assembly facing the support member is S, where 20% ≤ S1 / S ≤ 80%.
6. The battery cell according to any one of claims 1 to 5, characterized in that, At least one of the grooves has at least two fluid inlets, which are located on opposite sides of the support perpendicular to the first direction.
7. The battery cell according to claim 6, characterized in that, The support member includes multiple grooves that penetrate the edges of the support member along the second direction and are spaced apart along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.
8. The battery cell according to claim 7, characterized in that, Along the third direction, the minimum distance d1 between two adjacent grooves satisfies: d1≤10mm.
9. The battery cell according to claim 7, characterized in that, The dimension of the support member along the third direction is greater than the dimension along the second direction.
10. The battery cell according to any one of claims 1 to 5, characterized in that, At least one of the grooves is provided in a curved shape along a direction perpendicular to the first direction.
11. The battery cell according to claim 10, characterized in that, At least one of the grooves is provided in a spiral shape along a direction perpendicular to the first direction.
12. The battery cell according to claim 11, characterized in that, At least one of the grooves is provided in a wavy shape along a direction perpendicular to the first direction.
13. The battery cell according to claim 12, characterized in that, The support member has a plurality of wavy grooves, at least two adjacent grooves protruding in opposite directions along the extension direction.
14. The battery cell according to any one of claims 1 to 5, characterized in that, The groove has a width of b along the direction perpendicular to the first direction and its own extension direction. The width b of the groove gradually decreases from the fluid inlet of the groove inward.
15. The battery cell according to any one of claims 1 to 5, characterized in that, The groove has a dimension h along the first direction, and the dimension h gradually decreases from the fluid inlet of the groove inward.
16. The battery cell according to any one of claims 1 to 5, characterized in that, The groove includes a first flow channel and a plurality of second flow channels. The first flow channel extends inward from the edge of the support member perpendicular to the first direction. The plurality of second flow channels are respectively connected to the first flow channel and extend inward. The width b of the second flow channel is smaller than the width b of the first flow channel.
17. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 16.
18. An electrical appliance, characterized in that, Includes the battery device as described in claim 17, the battery device being used to provide electrical energy.