Battery monomer, battery and electric equipment

Abstract

The utility model provides a battery monomer, a battery and electric equipment, and the battery monomer comprises: a shell, the interior of which is hollow; the electrode assembly is arranged in the shell; the pressure relief part is arranged on the shell and used for releasing air pressure in the shell under set conditions; the protection part is connected with the shell and comprises a first area and a second area, the transparency of the first area is smaller than that of the second area, the second area at least coincides with the orthographic projection of the pressure relief part, the first area is at least staggered with the orthographic projection of the pressure relief part, and the second area is at least staggered with the orthographic projection of the pressure relief part. And the projection surface of the orthographic projection is the surface of the pressure relief piece. The orthographic projection of the first area and the orthographic projection of the pressure relief piece are staggered, so that interference to the pressure relief piece is reduced, direct observation of the pressure relief piece is further facilitated, the risk of further damage to the single battery is reduced, and the use reliability of the single battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell, a battery and an electrical device. Background Art

[0002] In power batteries, a pressure relief component is provided on the battery cell to reduce the risk of pressure buildup after thermal runaway of the battery cell. In related technologies, to solve the problem of contamination of the pressure relief component, a protective component is attached to the surface of the pressure relief component. The practical performance of the related protective component is average, resulting in average reliability during the use of the battery cell. Summary of the Utility Model

[0003] Embodiments of the present application provide a battery cell, a battery and an electrical device to solve the technical problem of how to improve the reliability of the battery cell while enhancing the safety of use of the pressure relief component.

[0004] Embodiments of the present application provide a battery cell, including:

[0005] A housing with a hollow interior;

[0006] An electrode assembly disposed inside the housing;

[0007] A pressure relief component disposed on the housing to release the air pressure inside the housing under set conditions;

[0008] A protective component connected to the housing. The protective component includes a first region and a second region. The transparency of the first region is less than that of the second region. The second region at least coincides with the orthographic projection of the pressure relief component, and the first region is at least misaligned with the orthographic projection of the pressure relief component. The projection plane of the orthographic projection is the surface of the pressure relief component.

[0009] Embodiments of the present application set a protective component to reduce the risk of the pressure relief component being contaminated by corrosive liquids such as electrolyte, and also reduce the risk of the pressure relief component deforming under external force, thereby facilitating the extension of the service life of the pressure relief component; by setting the protective component with a first region and a second region, where the transparency of the first region is less than that of the second region, the second region at least coincides with the orthographic projection of the pressure relief component, and the first region is at least misaligned with the orthographic projection of the pressure relief component, it is beneficial to partition the protective component, facilitating the observation of the state of the pressure relief component through the second region with high transparency to reduce the risk of damage to the pressure relief component, and using the first region with low transparency for marking to facilitate quick visual inspection during the assembly process, which is beneficial to improving the efficiency and quality of assembly. And compared with the solution of setting the second region with high visibility on the adhesive structure, it is beneficial to reduce the interference of the second region on the pressure relief component, thereby facilitating the direct observation of the pressure relief component and reducing the risk of further damage to the battery cell, so as to improve the reliability of the battery cell during use.

[0010] In some embodiments, the housing is provided with a pressure relief hole, the pressure relief member is disposed in the pressure relief hole, and the second region covers the pressure relief hole.

[0011] By ensuring that at least the region with high transparency covers the position of the pressure relief hole, the embodiments of the present application are more conducive to reducing the blockage of the pressure relief member, so as to more facilitate observing the working state of the pressure relief member and reducing the risk of further damage to the battery cell.

[0012] In some embodiments, the first region is disposed on the periphery of the second region.

[0013] In the embodiments of the present application, the orthographic projection of the second region at least ensures complete coverage of the pressure relief member, and the first region is disposed on the periphery of the second region, which is conducive to reducing the risk of interference of the first region on the observation of the pressure relief member.

[0014] In some embodiments, the first region is continuously disposed around the periphery of the second region.

[0015] By continuously disposing the first region in the embodiments of the present application, it is conducive to reducing the processing difficulty of the first region, and the first region has a continuous structure, which is conducive to improving the distinctiveness of the first region, so as to be more conducive to improving the efficiency and accuracy of visual inspection and the efficiency of battery cell product quality inspection.

[0016] In some embodiments, the first region is provided as multiple, and the multiple first regions are spaced apart on the periphery of the second region.

[0017] By providing the first region as multiple and discretely disposing the multiple first regions in the embodiments of the present application, it can not only realize the identification function of the protection member, but also be conducive to reducing costs.

[0018] In some embodiments, the first region and the second region are integrally processed and formed.

[0019] By integrally processing and forming the first region 51 and the second region 52 in the embodiments of the present application, it is conducive to simplifying the processing procedure of the protection member and improving the production capacity of the battery cell.

[0020] In some embodiments, the protection member includes a main body and a sub-body, the main body and the sub-body are detachably connected, at least part of the transparency of the sub-body is less than that of the main body, at least part of the second region is located in the main body, and at least part of the first region is located in the sub-body.

[0021] By disposing the first region and the second region on two separate components in the embodiments of the present application, separate processing of components with different transparencies is realized, and then fixed by bonding or welding.

[0022] In some embodiments, a convex portion is provided on the housing, the convex portion is disposed around the periphery of the pressure relief member, and the protection member is detachably connected to the convex portion.

[0023] In the embodiments of the present application, the convex portion is used to fix the protection member to reduce the difficulty of installing the protection member.

[0024] In some embodiments, the convex portion is adhesively bonded to the protection member.

[0025] In the embodiments of the present application, adhesively bonding the protection member to the convex portion is beneficial to reducing the processing difficulty and improving the processing efficiency.

[0026] In some embodiments, the convex portion has opposite inner and outer edges in the radial direction, the inner edge is closer to the pressure relief member than the outer edge, and the first region is located between the inner edge and the outer edge.

[0027] In the embodiments of the present application, by setting the first region between the inner edge and the outer edge, it can not only ensure that the first region does not exceed the boundary of the inner edge to reduce the line-of-sight interference with the pressure relief member, but also improve the connection stability of the protection member.

[0028] In some embodiments, the first distance between the inner edge and the outer edge is greater than or equal to the first width of the first region.

[0029] In the embodiments of the present application, by setting the first width to be less than the first distance of the convex portion, it is beneficial to accurately define the first region within the projection range of the convex portion, and reduce the risk that the orthographic projection of the first region exceeds the convex portion, thereby reducing the line-of-sight blockage and interference of the first region on the pressure relief member.

[0030] In some embodiments, the first width is less than or equal to 0.8 times the first distance.

[0031] In the embodiments of the present application, by limiting the maximum width of the first region in the radial direction to be less than or equal to 0.8 times the first distance, a certain assembly redundancy can be satisfied, the accuracy of the position where the protection member is installed on the housing can be improved, and the assembly efficiency of the protection member can be further improved.

[0032] In some embodiments, the second region is a colorless transparent component.

[0033] In the embodiments of the present application, by setting the second region as a colorless transparent component, it is beneficial to improve the visibility of the pressure relief member, which can not only ensure that the second region plays a protective role for the pressure relief member, but also reduce the line-of-sight obstruction effect of the second region on the pressure relief member.

[0034] In some embodiments, the first region is a colored transparent component.

[0035] In the embodiment of the present application, by setting the first region as a colored transparent component, the color rendering degree of the first region 51 is greater than that of the second region, which is convenient for directly understanding the state of the attached protection component during the processing and assembly of the battery cell, and improving the efficiency of assembly quality inspection.

[0036] In some embodiments, through holes are provided on the protection component, the through holes penetrate through opposite sides of the protection component, and the through holes are arranged in the second region.

[0037] In the embodiment of the present application, the through holes communicate the side close to the pressure relief hole and the outside of the battery cell, which can timely discharge the gas inside the protection component, improve the accuracy of helium leak detection, and is beneficial to improving the efficiency of identifying airtight abnormalities of the battery cell. At the same time, it can ensure the pressure balance on both sides of the protection patch, so as to reduce the risk of the protection patch falling off due to excessive internal and external pressures when heated at high temperatures.

[0038] In some embodiments, the aperture of the through hole is less than or equal to 1μm.

[0039] In the embodiment of the present application, the aperture of the through hole is less than or equal to 1μm and greater than 0, which can not only meet the requirement that the through hole realizes the gas conduction on both sides of the protection component to achieve the pressure balance on both sides of the protection component, but also the aperture of the through hole is not too large, so that the electrolyte can float on the surface of the through hole under the action of its own surface tension, reducing the risk of the electrolyte flowing into the pressure relief component.

[0040] In some embodiments, the pressure relief component is provided with a weak part, and the orthographic projection of the second region at least covers the weak part.

[0041] In the embodiment of the present application, the orthographic projection of the second region at least covers the weak part, that is to say, the second region with low transparency at least covers the weak part, reducing the risk of line of sight obstruction of the weak part.

[0042] The embodiment of the present application provides a battery, including the battery cell according to any one of the above.

[0043] The embodiment of the present application provides an electrical device, including the battery cell according to any one of the above or the battery according to the above.

[0044] Embodiments of the present application provide a battery cell, a battery, and an electrical device. The battery cell includes a housing, an electrode assembly, a pressure relief member, and a protection member. The interior of the housing is hollow. The electrode assembly is disposed within the housing. The pressure relief member is disposed on the housing to release the air pressure inside the housing under set conditions. The protection member is connected to the housing. The protection member includes a first region and a second region. The transparency of the first region is less than that of the second region. The second region at least coincides with the orthographic projection of the pressure relief member, and the first region is at least misaligned with the orthographic projection of the pressure relief member. The projection plane of the orthographic projection is the surface of the pressure relief member. By providing the protection member in the embodiments of the present application, the risk of the pressure relief member being contaminated by corrosive liquids such as electrolyte is reduced, and the risk of the pressure relief member deforming under external force is also reduced, thereby facilitating the extension of the service life of the pressure relief member. By providing the first region and the second region on the protection member, with the transparency of the first region being less than that of the second region, and the second region at least coinciding with the orthographic projection of the pressure relief member and the first region being at least misaligned with the orthographic projection of the pressure relief member, it is beneficial to partition the protection member, facilitating the observation of the state of the pressure relief member through the second region with high transparency to reduce the risk of damage to the pressure relief member, and marking through the first region with low transparency for quick visual inspection during the assembly process, which is beneficial to improving the efficiency and quality of the assembly. Moreover, compared with the solution of setting the second region with high visibility on the adhesive structure, it is beneficial to reduce the interference of the second region on the pressure relief member, and further facilitate the direct observation of the pressure relief member, reducing the risk of further damage to the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the drawings.

[0046] Figure 1 is a schematic structural diagram of an electrical device disclosed in an embodiment of the present application;

[0047] Figure 2 is a schematic structural diagram of a battery disclosed in an embodiment of the present application;

[0048] Figure 3 is a schematic structural diagram of the top cover in a battery cell disclosed in the first embodiment of the present application;

[0049] Figure 4 is a schematic structural diagram of the protection member disclosed in the first embodiment of the present application;

[0050] Figure 5 is a schematic structural diagram of the top cover in a battery cell disclosed in the second embodiment of the present application;

[0051] Figure 6It is a schematic structural diagram of a protection component disclosed in the second embodiment of the present application.

[0052] In the drawings, the drawings are not drawn to actual scale.

[0053] Marking description:

[0054] 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, battery cell; 211, carrier; 214, upper cover; 3, pressure relief component; 33, weak part; 4, housing; 41, top cover; 42, convex part; 421, inner edge; 422, outer edge; 43, pressure relief hole; 5, protection component; 51, first area; 52, second area; 53, body; 54, sub-body; 55, through hole. Detailed implementation manners

[0055] It should be noted that, without conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other. The detailed description in the detailed implementation manners should be understood as an explanatory illustration of the purpose of the present application and should not be regarded as an improper limitation to the present application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the present application are intended to cover non-exclusive inclusion.

[0057] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0058] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0059] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0060] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", "height direction", "first direction", and "second direction" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0061] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0062] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0063] With the development of clean energy, more and more devices use electric energy as driving energy, and then power batteries that can store more electric energy and can be charged and discharged repeatedly are developing rapidly, such as lithium-ion batteries. Among them, power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields.

[0064] With the country's vigorous promotion of new energy vehicles, new energy vehicles have ushered in a great opportunity for development. The safety and stability of automobiles have always been people's greatest concern. Therefore, improving the safety of new energy vehicles will be one of the important factors that determine whether new energy vehicles can be quickly popularized. Improving the safety of batteries is an important way to improve the safety of new energy vehicles.

[0065] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0066] A battery cell may include an electrode assembly and an electrolyte, wherein the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon. In order to ensure that a large current can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together. The material of the separator may be PP (polypropylene) or PE (polyethylene).

[0067] Illustratively, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0068] Exemplarily, the positive current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0069] Exemplarily, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

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

[0071] Exemplarily, the negative current collector has two surfaces opposite to each other in its own thickness direction, and the negative active material is disposed on any one or both of the two opposite surfaces of the negative current collector.

[0072] Exemplarily, the negative active material can be a negative active material for batteries well-known in the art. As an example, the negative active material can 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. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative active material of the battery can also be used. These negative active materials can be used alone or in combination of two or more.

[0073] The battery cell further includes an insulating film and a housing. The insulating film is coated on the outside of the electrode assembly, and the housing encapsulates the electrode assembly coated with the insulating film to form a battery cell. The insulating film can be a mylar film, and the housing can be an aluminum case or a steel case. After the electrode assembly is wound and formed, the encapsulation of the mylar film and the housing is completed through the mylar wrapping process and the case insertion process. Among them, the mylar film plays a role in sealing and protecting the electrode assembly, and the mylar film can effectively insulate the electrode assembly and the housing from each other to avoid internal short circuit of the battery cell. The housing plays a protective role.

[0074] Exemplarily, the housing 4 includes a top cover 41 and an outer shell. The outer shell is provided with an opening, and the top cover closes the opening to form a sealed space for accommodating substances such as an electrode assembly and an electrolyte. The outer shell may be provided with one or more openings. The top cover may also be provided with one or more openings.

[0075] Exemplarily, 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 may be directly connected to the tab or indirectly connected to the tab through an adapter. The electrode terminal may be provided on the top cover or on the outer shell.

[0076] Exemplarily, a pressure relief member is provided on the housing. The pressure relief member is used to release the internal pressure of the battery cell. It should be noted that the pressure relief member may be an explosion-proof valve or a pressure relief hole, etc.

[0077] The development of battery technology needs to consider various design factors simultaneously. For example, performance parameters such as energy density, discharge capacity, charge-discharge rate, etc. In addition, the safety and reliability of the battery also need to be considered.

[0078] In the prior art, a pressure relief member is provided on the battery cell in a power battery to reduce the risk of pressure buildup after thermal runaway of the battery cell. To solve the problem of contamination of the pressure relief member, a protective member is attached to the surface of the pressure relief member, and the protective member can protect the pressure relief member and reduce the risk of accidental deformation of the pressure relief member due to external force, which is beneficial to extending the service life of the pressure relief member and the battery cell. However, the attachment process of the related protective member is after the lithium battery is assembled. During the manufacturing process of the battery cell, the pressure relief member is in an exposed state, making it difficult to protect the pressure relief member during the manufacturing process of the battery cell. The related protective member will also block the sight of the pressure relief member, making it difficult to accurately and intuitively understand whether there is liquid leakage or tearing of the explosion-proof valve through the protective member. Therefore, the practical performance of the related protective member is average, resulting in average reliability of the battery cell during use.

[0079] The battery provided in the embodiment of the present application includes a box and a battery assembly, wherein the battery assembly is arranged in a receiving cavity, and the box protects the battery assembly. The bearing assembly of the box includes a bearing member, a mounting member, and a cooling unit. On the one hand, the mounting member is arranged on the side of the bearing member away from the receiving cavity, so that a mounting cavity is defined between the mounting member and the bearing member, and the cooling unit is arranged in the mounting cavity for heat exchange with the bearing member, thereby realizing cooling of the battery assembly carried on the bearing member. The protective member can be covered on the surface of the pressure relief member before the battery cell is installed to reduce the risk of the pressure relief member being contaminated by corrosive liquids such as electrolytes, and also reduce the risk of the pressure relief member being deformed by external forces, thereby helping to extend the service life of the pressure relief member; by providing the protective member with a first area and a second area, the transparency of the first area is less than the transparency of the second area, the second area at least coincides with the positive projection of the pressure relief member, and the first area is at least misaligned with the positive projection of the pressure relief member, it is helpful to partition the protective member, and it is convenient to observe the state of the pressure relief member through the second area with high transparency to reduce the risk of damage to the pressure relief member, and mark it through the first area with low transparency to facilitate rapid visual inspection during the assembly process, which is helpful to improve the efficiency and quality of assembly. Compared with the solution of setting the second area with high visibility on the adhesive structure, it is helpful to reduce the interference of the second area with the pressure relief member, and then it is helpful to directly observe the pressure relief member, reduce the risk of further damage to the battery cell, and help to improve the practical performance of the protective member and improve the reliability of the use of the battery cell.

[0080] The technical solution described in the embodiments of the present application is applicable to an electric device using a battery. The electric device includes a battery in any embodiment of the present application, and the battery is used to provide electric energy.

[0081] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0082] It should be noted that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including boxes and electrical equipment using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0083] Please refer to Figure 1 ,inside the vehicle 1000, a controller 200, a motor 300, and a battery 100 can be provided. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, the battery 100 can be provided at the bottom, the front end, or the rear end of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000 and used for the electrical system of the vehicle 1000, such as the working power requirements for starting, navigation, and running of the vehicle 1000. In another embodiment of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000 to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0084] To meet different power usage requirements, the battery 100 can include a plurality of battery cells 10. A battery cell refers to the smallest unit that makes up a battery module or a battery pack. The plurality of battery cells can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the plurality of battery cells. The plurality of battery cells can be directly connected in series, in parallel, or in a series-parallel combination and then the whole formed by the plurality of battery cells is accommodated in a box body; of course, the battery 100 can also be in the form that a plurality of battery cells are first connected in series, in parallel, or in a series-parallel combination to form battery modules, and then the plurality of battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in a box body. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for realizing the electrical connection among the plurality of battery cells. Among them, each battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc.

[0085] The box body can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder, or sphere. The material of the box body can be alloy materials such as aluminum alloy and ferroalloy, or polymer materials such as polycarbonate and polyisocyanurate foam plastic, or composite materials such as glass fiber reinforced epoxy resin.

[0086] The box body is used to accommodate the battery assembly, and the box body can be of various structures. In some embodiments, please refer to Figure 2, the box body may include an upper cover 214 and a carrier 211. The upper cover 214 and the carrier 211 are covered with each other, and the upper cover 214 and the carrier 211 jointly define a receiving cavity for receiving the battery cell 10. The carrier 211 may be a hollow structure with one end open, and the upper cover 214 is a plate-like structure. The upper cover 214 is covered on the open side of the carrier 211 to form a box body with a receiving cavity; both the upper cover 214 and the carrier 211 may also be hollow structures with one side open, and the open side of the upper cover 214 is covered on the open side of the carrier 211 to form a box body with a receiving cavity. Of course, the upper cover 214 and the carrier 211 can be of various shapes, such as a cylinder, a cuboid, etc.

[0087] To improve the sealing performance after the upper cover 214 and the carrier 211 are connected, a sealing member, such as sealant, sealing ring, etc., can also be provided between the upper cover 214 and the carrier 211.

[0088] Assume that the upper cover 214 is covered on the top of the carrier 211. The upper cover 214 can also be called the upper box cover, and the carrier 211 can also be called the lower box cover.

[0089] In the embodiment of the present application, the pressure relief member 3 is arranged in the housing 4 to release the air pressure inside the housing 4 under set conditions.

[0090] As Figure 3 shown, the battery cell in the embodiment of the present application includes a protection member 5. The protection member 5 is connected to the housing 4, and the protection member 5 is used to cover at least one side of the pressure relief member 3 facing away from the center of the housing 4. By arranging the protection member 5 on the battery cell in the present application, it is beneficial to reduce the risk of the pressure relief member 3 being contaminated by corrosive liquids such as electrolyte, and reduce the interference of leakage of other battery cells in the battery pack; and through the protection of the protection member 5 on the pressure relief member 3, it is beneficial to reduce the risk of the pressure relief member deforming under external force, and thus beneficial to extend the service life of the pressure relief member and the battery cell.

[0091] The protection member in the embodiment of the present application can be directly attached during the assembly process of the battery cell, without waiting until the entire battery is assembled and then attached, which is beneficial to protecting the pressure relief member during the assembly process of the battery cell.

[0092] Combined with Figures 3 - 6As shown, the protection member 5 in the embodiment of the present application includes a first region 51 and a second region 52. The transparency of the first region 51 is less than that of the second region 52. It should be noted that the transparency described in the embodiment of the present application refers to the degree of light transmission through the surface of the protection member 5. The higher the transparency, the greater the degree of light that can pass through the surface of the protection member 5, and the lower the transparency, the smaller the degree of light that can pass through the surface of the protection member 5. Visually, the difference in transparency is mainly reflected in the presentation of the object. Specifically, the second region 52 with high transparency is more conducive to allowing the background of the pressure relief member to pass through and be displayed outside the battery cell, while the first region 51 with low transparency has a lower degree of passing through the background and being displayed outside the battery cell, so that the background will be blocked or partially blocked.

[0093] In the embodiment of the present application, the transparency of the protection member 5 is set in regions. The fact that the transparency of the first region 51 is less than that of the second region 52 means that the degree of light that can pass through the surface of the first region 51 is less than that of the second region 52.

[0094] Among them, in combination with Figure 3 As shown, the second region 52 at least coincides with the orthographic projection of the pressure relief member 3, and the first region 51 is at least misaligned with the orthographic projection of the pressure relief member 3. The projection plane of the orthographic projection is the surface of the pressure relief member 3. It should be noted that the projection direction of the orthographic projection is perpendicular to the surface of the pressure relief member 3. Among them, the surface of the pressure relief member 3 is the largest surface area in the pressure relief member 3, which can be understood as the top surface of the pressure relief member or the bottom surface of the pressure relief member. The perpendicularity described in the embodiment of the present application means that the projection direction is approximately 90 degrees with the surface of the pressure relief member, and this angle can be any angle around 90 degrees, rather than limited to 90 degrees. And the surface of the pressure relief member is not limited to a plane.

[0095] This projection direction can also be understood as the thickness direction of the pressure relief member. In the thickness direction of the pressure relief member, the protection member 5 is arranged on one side of the pressure relief member, and the second region 52 on the protection member 5 at least coincides with the orthographic projection of the pressure relief member 3. That is to say, the second region 52 of the protection member 5 can completely coincide with the orthographic projection of the pressure relief member 3, or a part of the second region 52 can completely coincide with the orthographic projection of the pressure relief member 3, and the other part is misaligned with the orthographic projection of the pressure relief member 3; no matter which form is adopted, at least ensure that the orthographic projection of the second region 52 needs to completely cover the protection member 5.

[0096] It should be noted that the first region 51 is at least misaligned with the orthographic projection of the pressure relief member 3. Among them, the above feature means that the first region 51 is completely misaligned with the pressure relief member 3. Among them, the misaligned region between the protection member 5 and the pressure relief member 3 can be completely composed of the first region 51, or partially composed of the first region 51 and the other part composed of the second region 52. But at least ensure that the orthographic projection of the first region 51 is completely outside the boundary of the pressure relief member 3.

[0097] An embodiment of the present application provides a battery cell, which includes a housing, an electrode assembly, a pressure relief member, and a protection member. The interior of the housing is hollow. The electrode assembly is disposed inside the housing. The pressure relief member is disposed on the housing to release the air pressure inside the housing under set conditions. The protection member is connected to the housing. The protection member includes a first region and a second region. The transparency of the first region is less than that of the second region. The second region at least coincides with the orthographic projection of the pressure relief member, and the first region is at least offset from the orthographic projection of the pressure relief member. The projection plane of the orthographic projection is the surface of the pressure relief member. By providing the protection member in the embodiment of the present application, the risk of the pressure relief member being contaminated by corrosive liquids such as electrolyte is reduced, and the risk of the pressure relief member deforming under external force is also reduced, which is conducive to extending the service life of the pressure relief member; by providing the protection member with a first region and a second region, the transparency of the first region is less than that of the second region, the second region at least coincides with the orthographic projection of the pressure relief member, and the first region is at least offset from the orthographic projection of the pressure relief member, it is beneficial to partition the protection member, facilitating the observation of the state of the pressure relief member through the second region with high transparency to reduce the risk of damage to the pressure relief member, and marking through the first region with low transparency for quick visual inspection during the assembly process, which is beneficial to improving the efficiency and quality of assembly. And compared with the solution of setting the second region with high visibility on the adhesive structure, it is beneficial to reduce the interference of the second region on the pressure relief member, and further beneficial to the direct observation of the pressure relief member, reducing the risk of further damage to the battery cell, so as to improve the reliability of the battery cell during use.

[0098] In some embodiments, as Figure 3 shown, the housing 4 is provided with a pressure relief hole 43, and the pressure relief hole 43 penetrates through the inner and outer sides of the housing 4. In some embodiments, the pressure relief member 4 is disposed on the top cover 41, and the pressure relief hole 43 penetrates through the inner and outer sides of the top cover 41. Herein, the inner side refers to the side of the top cover 41 close to the housing cavity, and the outer side refers to the side of the top cover 41 away from the housing cavity. Whether the pressure relief member 4 is disposed on the top cover 41 or the outer shell will not affect the function of the pressure relief member 4 to release the internal gas pressure of the housing. The pressure relief member 3 is disposed in the pressure relief hole 43, that is, the pressure relief member 3 covers the pressure relief hole 43. When the internal air pressure of the housing 4 is greater than the external air pressure, the housing releases the gas pressure through the pressure relief member 3. Herein, the form of gas pressure release in the embodiment of the present application includes but is not limited to the internal gas of the housing directly lifting the pressure relief member 3 to open the pressure relief hole; it can also be that the internal gas of the housing breaks through the pressure relief member 3, causing partial rupture of the pressure relief member to connect the inner and outer sides of the housing. The embodiment of the present application does not limit the specific pressure relief form of the pressure relief member.

[0099] As Figure 3As shown, the second region 52 covers the pressure relief hole. Covering means that the orthographic projection of the second region 52 completely covers the pressure relief hole, which can also be understood as the projection area of the orthographic projection of the second region 52 being greater than or equal to the cross-sectional area of the pressure relief hole. Among them, the second region 52 represents a region with high transparency, that is to say, at least ensuring that the region with high transparency covers the position of the pressure relief hole is more conducive to reducing the occlusion of the pressure relief member, so as to be more conducive to observing the working state of the pressure relief member and reducing the risk of further damage to the battery cell.

[0100] In some embodiments, as Figure 3 shown, the first region 51 is arranged on the periphery of the second region 52. That is to say, the first region 51 is located radially outside the second region 52. Among them, the radial direction represents the direction radiating outward from the center of the pressure relief member. The periphery of the second region 52 can be understood as the boundary of the second region 52 far from the center. That is to say, the first region 51 is arranged on the side of the second region 52 far from the center. In the embodiment of the present application, the orthographic projection of the second region 52 at least ensures complete coverage of the pressure relief member, and the first region 51 is arranged on the periphery of the second region 52, which is conducive to reducing the interference risk of the first region 51 to the observation of the pressure relief member.

[0101] It should be noted that the embodiment of the present application does not limit the specific layout method of the second region 52 and the first region 51. For example, the first region 51 can be continuously arranged or discretely arranged. Specifically, referring to Figure 3 and Figure 4 shown in the embodiment, the first region 51 is continuously arranged. That is to say, the first region 51 is continuously arranged around the periphery of the second region 52. Continuous means that the first region 51 forms a closed-loop structure. In the embodiment of the present application, by continuously arranging the first region 51, it is conducive to reducing the processing difficulty of the first region, and the first region has a continuous structure, which is conducive to improving the distinctiveness of the first region, so as to be more conducive to improving the efficiency and accuracy of visual inspection and the efficiency of battery cell product quality inspection.

[0102] In some embodiments, as Figure 5 and Figure 6 shown, the first region 51 is set as multiple, and the multiple first regions 51 are arranged at intervals on the periphery of the second region 52. That is to say, the first region 51 is discretely arranged. In the region misaligned with the pressure relief member, part of it can be set as discrete first regions 51, and the other part can be set as the second region or can be hollowed out. The embodiment of the present application does not limit the other part of the misaligned region. In the embodiment of the present application, by setting the first region as multiple and the multiple first regions are discretely arranged, it can not only realize the identification function of the protection member, but also is conducive to reducing costs.

[0103] It should be noted that the embodiments of the present application do not limit the forming method of the first region 51 and the second region 52. For example, in some embodiments, as Figures 3 - 4 shown, the first region 51 and the second region 52 are integrally formed. That is to say, the first region 51 and the second region 52 can be integrally arranged through processes such as hot pressing and injection molding. By integrally forming the first region 51 and the second region 52 in the embodiments of the present application, it is beneficial to simplify the processing procedures of the protection member and improve the production capacity of the battery cell.

[0104] In some embodiments, as Figure 5 and Figure 6 shown, the protection member 5 includes a main body 53 and a sub-body 54. The main body 53 and the sub-body 54 are detachably connected. That is to say, the protection member 5 is provided as two separately processed parts. The transparency of at least a part of the sub-body 54 is less than that of the main body 53. At least a part of the second region 52 is located in the main body 53, and at least a part of the first region 51 is located in the sub-body 54. By arranging the first region 51 and the second region 52 on two separate components, the separate processing of components with different transparencies is realized, and then they are fixed by bonding or welding. The layout methods of the first region and the second region in the embodiments of the present application include but are not limited to the above several embodiments.

[0105] In some embodiments, as Figure 3 and Figure 5 shown, a convex portion 42 is provided protruding on the housing 4. It should be noted that "protruding" means that the convex portion 42 is provided on the outer surface of the housing, and the convex portion 42 protrudes in a direction away from the inner side of the housing. The convex portion 42 is arranged around the periphery of the pressure relief member 3. It can also be understood that the convex portion 42 is arranged around the edge of the pressure relief hole 43. Herein, "around" means that the convex portion 42 is arranged along the circumferential direction of the pressure relief member 3. The setting form of the convex portion 42 can be continuous or discrete. In the case of continuous setting, the convex portion 42 can be a structure forming a closed loop along the circumferential direction. The convex portion 42 is used to fix the protection member 5 to reduce the installation difficulty of the protection member 5. The convex portion 42 and the protection member 5 are detachably connected. It should be noted that the embodiments of the present application do not limit the form of fixing the protection member 5 to the convex portion 42. For example, the protection member can be fixed to the convex portion 42 by means of glue, or in other embodiments, the protection member can also be fixed to the convex portion by welding, hot melting and other means.

[0106] In some embodiments, the protruding portion 42 is arranged in a non-closed-loop structure. Herein, the non-closed-loop structure includes a gap between the head end and the tail end of the protruding portion 42, rather than a coincident arrangement. When the protective member is attached to the protruding portion 42, a gap is formed between the head end and the tail end of the protruding portion 42. This gap can communicate the inner and outer sides of the protective member, which is conducive to forming a weak area between the connection relationship of the protective member and the protruding portion, thereby reducing the difficulty of uncovering the protective member when the battery cell is in a pressure relief state, so as to reduce the interference of the protective member on the pressure relief process in the thermal runaway state. The non-closed-loop structure also includes a discrete structure of the protruding portion 42, that is, by connecting a part of the first region to the protruding portion and spacing another part of the first region from the housing, multiple spaced weak areas are formed.

[0107] The forms of the protruding portion provided in the embodiments of the present application and the connection manner between the protective member and the protruding portion include but are not limited to the above several embodiments.

[0108] In the embodiments of the present application, by providing a protruding protruding portion on the housing, the protective member is connected to the housing through the protruding portion, which is conducive to reducing the influence on the protective member during the assembly and transportation of the battery cell and improving the installation stability of the protective member. And in some embodiments, by providing a gap between the protruding portion and the housing, a weak connection area is formed between the protective member and the housing, which is conducive to uncovering the protective member in the thermal runaway state and reducing the interference of the protective member on the pressure relief process.

[0109] In some embodiments, in combination Figure 3 and Figure 4 as shown, the protruding portion 42 has opposite inner edge 421 and outer edge 422 in the radial direction. Herein, the inner edge 421 is closer to the pressure relief member 3 than the outer edge 422. Specifically, the inner edge 421 and the outer edge 422 can be defined as two opposite boundary lines of the top surface of the protruding portion 42 in the radial direction. The first region 51 is located between the inner edge 421 and the outer edge 422.

[0110] In the embodiments of the present application, by arranging the first region between the inner edge and the outer edge, it can not only ensure that the first region does not exceed the boundary line of the inner edge to reduce the line-of-sight interference on the pressure relief member, but also improve the connection stability of the protective member.

[0111] In some embodiments, in combination Figure 3 and Figure 4As shown, the first distance L1 between the inner edge and the outer edge is greater than or equal to the first width L2 of the first region. In the embodiments of the present application, the first width L2 of the first region 51 represents the dimension of the first region 51 in the radial direction, where the above-mentioned radial direction refers to the direction extending from the center of the protective member 5 to the periphery of the protective member. In some embodiments, the first region 51 may be set as an annular structure, and the first width L2 at each position in the circumferential direction of the annular shape is equal. By setting the first width L2 to be less than the first distance L1 of the convex portion, it is beneficial to accurately define the first region within the projection range of the convex portion, and reduce the risk that the orthographic projection of the first region exceeds the convex portion, thereby reducing the line-of-sight blockage and interference of the first region to the pressure relief member.

[0112] In some embodiments, in combination with Figure 3 and Figure 4 As shown, the first width L2 is less than or equal to 0.8 times the first distance L1. It can be understood that the maximum width of the first region 51 in the radial direction is defined as the first width L2. By limiting the maximum width of the first region 51 in the radial direction to be less than or equal to 0.8 times the first distance L1, a certain assembly redundancy can be satisfied, the accuracy of the position where the protective member is installed on the housing can be improved, and the assembly efficiency of the protective member can be further improved.

[0113] In some embodiments, such as Figure 3 As shown, the second region 52 is a colorless transparent component. It should be noted that the colorless transparent component means that the transparency of the second region is close to 0, or the transparency of the second region is less than or equal to the first set value. By setting the second region 52 as a colorless transparent component in the embodiments of the present application, it is beneficial to improve the visibility of the pressure relief member, which can not only ensure that the second region plays a protective role for the pressure relief member, but also reduce the line-of-sight obstruction effect of the second region on the pressure relief member.

[0114] In some embodiments, such as Figure 3 As shown, the first region 51 is a colored transparent component. It should be noted that the colored transparent component means that the transparency of the first region 51 is lower than the transparency of the second region 52, and setting the first region 51 as a colored transparent component may be that the transparency of the first region 51 is less than or equal to the second set value, and the second set value may be 100. When the transparency of the first region 51 is 100, the first region 51 is set as an opaque component; or, when the transparency of the first region 51 is set to be less than 100, the second set value is greater than the first set value. By setting the first region 51 as a colored transparent component in the embodiments of the present application, the color rendering degree of the first region 51 is greater than that of the second region, which is convenient to directly understand the state of the protective member during the processing and assembly of the battery cell, and improve the efficiency of assembly quality inspection.

[0115] In some embodiments, in combination withFigure 5 and Figure 6 As shown, the protective member 5 is provided with a through hole 55, and the through hole 55 penetrates through opposite sides of the protective member 5. Herein, penetration means that the through hole 55 is provided to penetrate in the thickness direction of the protective member 5, so that the through hole 55 communicates the spaces on both sides of the protective member 5 in the thickness direction. For example, the through hole 55 can conduct the gas on both sides of the protective member 5 in the thickness direction to balance the air pressure on both sides of the protective member 5 in the thickness direction. Specifically, in the embodiment of the present application, the through hole 55 is provided in the second region 52. When the protective member 5 covers the pressure relief hole 43, the protective member 5 can separate the pressure relief hole 43 from the outside of the battery cell. One side of the through hole 55 is close to the pressure relief hole 43, and the other side of the through hole 55 is far from the pressure relief hole 43. For example, when the temperature of the battery cell changes, the gas on the side close to the pressure relief hole 43 changes in volume due to the temperature change, that is, the gas pressure changes. By connecting the side close to the pressure relief hole 43 and the outside of the battery cell through the through hole 55, the gas inside the protective member can be discharged in time, improving the accuracy of helium leak detection and facilitating the improvement of the efficiency of the battery cell to identify airtight abnormalities. At the same time, it can ensure the pressure balance on both sides of the protective patch to reduce the risk of the protective patch falling off due to excessive internal and external pressures when heated at high temperatures.

[0116] In some embodiments, as Figure 6 shown, the aperture of the through hole 55 is less than or equal to 1 μm. It should be noted that the aperture of the through hole 55 refers to the maximum width of the cross-section of the through hole 55, and the cross-section of the through hole 55 is perpendicular to the thickness direction of the protective member. The embodiment of the present application does not limit the cross-sectional shape of the through hole 55, and the cross-sectional shape can be circular, square, triangular, etc. When the cross-section of the through hole 55 is set to be circular, the aperture of the through hole 55 refers to the diameter of the circular cross-section. When the cross-section of the through hole 55 is set to be non-circular, the aperture of the through hole 55 can be represented by the diameter of a circle with the same cross-sectional area as the cross-section. For example, when the cross-section of the through hole 55 is square, the aperture of the through hole 55 refers to the diameter of a circle with the same cross-sectional area as the square.

[0117] In the embodiment of the present application, the aperture of the through hole 55 is less than or equal to 1 μm and greater than 0, which can not only meet the requirement that the through hole realizes the conduction of gas on both sides of the protective member to achieve the pressure balance on both sides of the protective member, but also ensure that the aperture of the through hole 55 is not too large, so that the electrolyte can float on the surface of the through hole 55 under the action of its own surface tension, reducing the risk of the electrolyte flowing into the pressure relief member.

[0118] In some embodiments, the pressure relief member 3 is provided with a weak portion 33, and the orthographic projection of the second region at least covers the weak portion 33. It should be noted that the weak portion 33 means that the pressure relief member 3 is more likely to relieve pressure in the region of the weak portion 33. For example, the weak portion 33 is set as a notch, and the thickness at the notch position is smaller than the thickness at other positions. In the state of thermal runaway, the internal air pressure of the battery cell is greater than the external air pressure, and the action of the pressure difference or the action of high temperature causes the notch to rupture to release the internal air pressure of the battery cell. In the embodiment of the present application, the orthographic projection of the second region at least covers the weak portion, that is to say, the second region with low transparency should at least cover the weak portion to reduce the risk of line of sight obstruction of the weak portion.

[0119] The embodiment of the present application provides a battery cell, which includes a protection member. The protection member includes a chromaticity ring and a white transparent body. The width (L2) of the chromaticity ring ≤ 0.8 * the width (L1) of the convex portion 42 on the top cover. The inner diameter of the chromaticity ring is equal to the outer edge contour size of the white transparent body, and the outer diameter of the chromaticity ring is equal to the outer diameter of the convex portion 42 on the top cover, which is beneficial to reducing the risk of accidental touch and uncovering of the protection member during the assembly process. The protection member is attached to the convex portion 42 on the top cover through white transparent adhesive or other adhesives. The chromaticity ring can be entirely chromatic or partially chromatic; the color of the chromaticity ring can be a single color or composed of a combination of multiple colors; the form of the chromaticity ring can have various changes, including but not limited to linear, strip-shaped, circular, elliptical, etc.; the white transparent body is provided with through holes 55, and the position of the through holes 55 is not limited, and the number of through holes 55 ≥ 1; the chromaticity ring and the white transparent body can be an integral structure or an independent combined structure.

[0120] On the premise of not destroying the protection function of the protection member, it is beneficial to reduce the risk of visual field obstruction of the pressure relief member, improve the structural flatness of the upper surface of the visual pressure relief member, facilitate observing whether there is any abnormality in any part of the pressure relief member, so as to timely pick out defective top covers or battery cells. At the same time, it can also timely detect the top covers and battery cells with abnormal protection members and rework the pasting to prevent damage to the pressure relief member. The chromaticity ring as a whole or partially has chromaticity differences to distinguish it from the white transparent body, which is beneficial to quickly and effectively identify the top covers and battery cells with abnormal protection members. The through holes 55 can timely discharge the gas inside the protection member, improve the accuracy of helium leak detection, and improve the efficiency of identifying the airtight abnormality of the battery cell. At the same time, it is beneficial to balance the pressure on both sides of the protection member to reduce the risk of the protection member falling off due to excessive internal and external pressures during high-temperature heating. The chromaticity ring and the white transparent body can be integrally formed on the same substrate.

[0121] An embodiment of the present application provides a battery, including the battery cell described in any of the above embodiments. The battery cell includes a housing, an electrode assembly, a pressure relief member, and a protection member. The interior of the housing is hollow, the electrode assembly is disposed inside the housing, the pressure relief member is disposed on the housing to release the air pressure inside the housing under set conditions, the protection member is connected to the housing, the protection member includes a first region and a second region, the transparency of the first region is less than that of the second region, the second region at least coincides with the orthographic projection of the pressure relief member, and the first region is at least offset from the orthographic projection of the pressure relief member. The projection plane of the orthographic projection is the surface of the pressure relief member. In the embodiment of the present application, by providing a protection member in the battery cell, the risk of the pressure relief member being contaminated by corrosive liquids such as electrolyte is reduced, and the risk of the pressure relief member deforming under external force is also reduced, thereby facilitating the extension of the service life of the pressure relief member; by providing the protection member with a first region and a second region, the transparency of the first region is less than that of the second region, the second region at least coincides with the orthographic projection of the pressure relief member, and the first region is at least offset from the orthographic projection of the pressure relief member, it is beneficial to partition the protection member, facilitating the observation of the state of the pressure relief member through the second region with high transparency to reduce the risk of damage to the pressure relief member, and marking through the first region with low transparency for quick visual inspection during the assembly process, which is beneficial to improving the efficiency and quality of the assembly. And compared with the solution of setting the second region with high visibility on the adhesive structure, it is beneficial to reduce the interference of the second region on the pressure relief member, and further beneficial to the direct observation of the pressure relief member, reducing the risk of further damage to the battery cell.

[0122] An embodiment of the present application provides an electrical device, including the battery cell described in any of the above embodiments or the above battery. For the electrical device in the embodiment of the present application, by providing a protection member in the battery cell, the risk of the pressure relief member being contaminated by corrosive liquids such as electrolyte is reduced, and the risk of the pressure relief member deforming under external force is also reduced, thereby facilitating the extension of the service life of the pressure relief member; by providing the protection member with a first region and a second region, the transparency of the first region is less than that of the second region, the second region at least coincides with the orthographic projection of the pressure relief member, and the first region is at least offset from the orthographic projection of the pressure relief member, it is beneficial to partition the protection member, facilitating the observation of the state of the pressure relief member through the second region with high transparency to reduce the risk of damage to the pressure relief member, and marking through the first region with low transparency for quick visual inspection during the assembly process, which is beneficial to improving the efficiency and quality of the assembly. And compared with the solution of setting the second region with high visibility on the adhesive structure, it is beneficial to reduce the interference of the second region on the pressure relief member, and further beneficial to the direct observation of the pressure relief member, reducing the risk of further damage to the electrical device.

[0123] In addition to the embodiments of the above claims, specific embodiments involving more specific features or combinations thereof may be preferred and may be shown in the drawings.

[0124] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The shell is hollow inside; An electrode assembly is disposed in the housing; A pressure relief member, disposed in the housing, to release the air pressure inside the housing under set conditions; A protective member is connected to the shell, the protective member includes a first area and a second area, the transparency of the first area is less than the transparency of the second area, the second area at least coincides with the orthographic projection of the pressure relief member, the first area is at least misaligned with the orthographic projection of the pressure relief member, and the projection surface of the orthographic projection is the surface of the pressure relief member.

2. The battery cell according to claim 1, characterized in that: The shell is provided with a pressure relief hole, the pressure relief member is provided in the pressure relief hole, and the second area covers the pressure relief hole.

3. The battery cell according to claim 1, characterized in that: The first area is arranged at the periphery of the second area.

4. The battery cell according to claim 3, characterized in that: The first area is continuously arranged around the periphery of the second area.

5. The battery cell according to claim 3, characterized in that: The first area is provided in plurality, and the plurality of first areas are arranged at intervals on the periphery of the second area.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The first region and the second region are integrally formed.

7. The battery cell according to any one of claims 1 to 5, characterized in that: The protective member includes a main body and a sub-body, wherein the main body is detachably connected to the sub-body, at least part of the sub-body is less transparent than the main body, at least part of the second area is located in the main body, and at least part of the first area is located in the sub-body.

8. The battery cell according to any one of claims 1 to 5, characterized in that: A protruding portion is protruded from the shell, and the protruding portion is arranged around the periphery of the pressure relief member, and the protective member is detachably connected to the protruding portion.

9. The battery cell according to claim 8, characterized in that: The protrusion is bonded to the protection member.

10. The battery cell according to claim 8, characterized in that: The protrusion has an inner edge and an outer edge opposite to each other in the radial direction, the inner edge is closer to the pressure relief member than the outer edge, and the first area is located between the inner edge and the outer edge.

11. The battery cell according to claim 10, characterized in that: A first distance between the inner edge and the outer edge is greater than or equal to a first width of the first region.

12. The battery cell according to claim 11, characterized in that: The first width is less than or equal to 0.8 times the first spacing.

13. The battery cell according to any one of claims 1 to 5, characterized in that: The second region is a colorless and transparent component.

14. The battery cell according to claim 13, characterized in that: The first area is a colored transparent component.

15. The battery cell according to any one of claims 1 to 5, characterized in that: The protective member is provided with a through hole, the through hole passes through two opposite sides of the protective member, and the through hole is arranged in the second area.

16. The battery cell according to claim 15, characterized in that: The aperture of the through hole is less than or equal to 1 μm.

17. The battery cell according to any one of claims 1 to 5, characterized in that: The pressure relief member is provided with a weak portion, and the orthographic projection of the second area at least covers the weak portion.

18. A battery, characterized in that: Comprising a battery cell according to any one of claims 1-17.

19. An electrical equipment, characterized in that: Comprising the battery cell according to any one of claims 1 to 17 or the battery according to claim 18.

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