Plastic components, end cover assemblies, battery cells, batteries and electrical equipment

Abstract

The present invention provides a plastic member (23), a battery cell (20), a battery (100), and electrical equipment, and relates to the battery technology field. The plastic member (23) is a plate-shaped body (231) having a first through-hole (202) that penetrates the body (231) along the thickness direction, and a first reinforcing member (232a) provided on the body (231), protruding from the surface of the body (231), located around the first through-hole (202), and close to the first through-hole (202).

Description

Technical Field

[0001] (Cross - reference to Related Applications) This application claims priority to Chinese Patent Application No. 2023224667613, filed on September 12, 2023, with the title "Structural Member, End Cover Assembly, Battery Cell, Battery and Electrical Device", and Chinese Patent Application No. 2023230184009, filed on November 8, 2023, with the title "Plastic Member, End Cover Assembly, Battery Cell, Battery and Electrical Device", and all the contents of these applications are incorporated herein by reference.

[0002] This application relates to the field of battery technology, specifically to plastic members, end cover assemblies, battery cells, batteries and electrical devices.

Background Art

[0003] Energy conservation and emission reduction are the key to the sustainable development of the automotive industry. Electric vehicles have become an important component of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental friendliness. For electric vehicles, battery technology is an important element in their development.

[0004] Batteries are widely used in fields such as portable electronic devices, electric transportation means, electric tools, drones, and energy storage devices. In the battery manufacturing process, the yield of components within the battery is an issue that cannot be ignored. Therefore, how to improve the yield of each component within the battery and reduce the production difficulty of the components within the battery is a technical problem that must be urgently solved in battery technology.

Summary of the Invention

[0005] This application provides plastic members, battery cells, batteries and electrical devices that can improve the production efficiency of batteries.

[0006] This application is realized by the following technical solutions.

[0007] In the first embodiment, the embodiment of this application provides a plastic member with significantly improved mold release efficiency.

[0008] A plastic member according to an embodiment of the present invention is a plate-shaped body having a first through-hole that penetrates the body along the thickness direction, and a member provided on the body, protruding from the surface of the body and located around the first through-hole. 1 It comprises a first reinforcing member located adjacent to the through hole.

[0009] In the above-described solution, a first reinforcing member is provided on the main body, and the first reinforcing member is located around and close to the first through-hole. As a result, the first reinforcing member can not only improve the overall structural strength of the plastic member, but most importantly, it can significantly improve the structural strength of the area surrounding the first through-hole. Therefore, when a force is applied to the area surrounding the first through-hole, for example, in the process of demolding when an ejector pin comes into contact with the area surrounding the first through-hole, the amount of deformation of the area surrounding the first through-hole is reduced, and furthermore, the amount of deformation of the entire plastic member is reduced. This facilitates the smooth demolding of the plastic member by the ejector pin, and improves the demolding efficiency of the plastic member.

[0010] According to some embodiments of this application, the thickness of the main body is denoted as t, and the condition 0.1 mm ≤ t ≤ 1.0 mm is satisfied. By satisfying the above range for the thickness of the main body, the overall thickness of the plastic component can be reduced, and the ratio of the volume of the plastic component to the space occupied by the battery cell can be reduced, thereby improving the energy density of the battery cell.

[0011] According to some embodiments of this application, the condition 0.1 mm ≤ t ≤ 0.6 mm is satisfied. By satisfying the above range for the thickness of the main body, the overall thickness of the plastic component can be reduced, and the ratio of the volume of the plastic component to the space occupied by the battery cell can be reduced, thereby improving the energy density of the battery cell.

[0012] According to some embodiments of this application, there are multiple first reinforcing members, and these multiple first reinforcing members are spaced apart along the circumferential direction of the first through-hole. This not only improves the structural strength of the area surrounding the first through-hole on the main body, but also allows for uniform structural strength across the area surrounding the first through-hole on the main body.

[0013] According to some embodiments of this application, the first reinforcing member is an arc-shaped reinforcing rib. An arc-shaped reinforcing rib can improve the structural strength around the first through-hole on the main body more than a straight reinforcing rib.

[0014] According to some embodiments of this application, the arc-shaped reinforcing rib has a first opening provided on the opposite side of the first through-hole. This further improves the structural strength of the region surrounding the first through-hole on the main body.

[0015] According to some embodiments of this application, the radian of the arc-shaped reinforcing rib is denoted as α, satisfying the condition 90° ≤ α ≤ 270°. By satisfying the above range for the radian of the arc-shaped reinforcing rib, not only can the structural strength of the area surrounding the first through-hole on the main body be improved, but the difficulty of processing the arc-shaped reinforcing rib is also reduced because it is not completely closed, thereby improving the production efficiency of the plastic member.

[0016] According to some embodiments of this application, 135° ≤ α ≤ 225°. By ensuring that the radians of the arc-shaped reinforcing ribs satisfy the above range, not only can the structural strength of the area surrounding the first through-hole on the main body be improved, but the difficulty of processing the arc-shaped reinforcing ribs is also reduced because they are not completely closed, thereby improving the production efficiency of the plastic members.

[0017] According to some embodiments of this application, the radius of the arc-shaped reinforcing rib is R1, satisfying 0.5 mm ≤ R1 ≤ 5 mm. By satisfying the above condition for the radius of the arc-shaped reinforcing rib, not only can the area occupied by the arc-shaped reinforcing rib on the main body be reduced, but in combination with the above condition for the radian α of the arc-shaped reinforcing rib, the overall structure of the arc-shaped reinforcing rib becomes more compact. A compact arc-shaped reinforcing rib significantly improves the structural strength of the area surrounding the first through-hole of the main body compared to an arc-shaped reinforcing rib with a larger volume.

[0018] According to some embodiments of this application, 1 mm ≤ R1 ≤ 4 mm. By satisfying the above condition for the radius of the arc-shaped reinforcing rib, not only can the area occupied by the arc-shaped reinforcing rib on the main body be reduced, but in combination with the above condition for the radian α of the arc-shaped reinforcing rib, the overall structure of the arc-shaped reinforcing rib becomes more compact, and a compact arc-shaped reinforcing rib significantly improves the structural strength of the area surrounding the first through-hole of the main body compared to an arc-shaped reinforcing rib with a larger volume.

[0019] According to some embodiments of this application, the radius of the arc-shaped reinforcing rib is R1, and the radius of the first through-hole is R2, satisfying 0.06 ≤ R1 / R2 ≤ 1.67. This eliminates the problem that a large number of arc-shaped reinforcing ribs would be required to maintain approximately the same strength in the area surrounding the first through-hole on the main body, due to the radius of the arc-shaped reinforcing rib being too small compared to the radius of the first through-hole, thereby increasing the difficulty of processing the plastic member. Furthermore, it also eliminates the problem that only a small number of arc-shaped reinforcing ribs can be placed in the area surrounding the first through-hole on the main body, resulting in uneven strength in the area surrounding the first through-hole.

[0020] According to some embodiments of this application, 0.2 ≤ R1 / R2 ≤ 1. This eliminates the problem that a large number of arc-shaped reinforcing ribs would be required to maintain nearly identical strength in the area surrounding the first through-hole on the main body, due to the radius of the arc-shaped reinforcing ribs being too small compared to the radius of the first through-hole. This not only avoids the increased difficulty in processing the plastic member, but also, of course, avoids the problem that a small number of arc-shaped reinforcing ribs can be placed in the area surrounding the first through-hole on the main body, resulting in inconsistent strength in that area.

[0021] According to some embodiments of this application, the main body is provided with an ejector pin fitting region adjacent to the first through hole, and the arc-shaped reinforcing rib is in the ejector pin fitting region and the 1 It is positioned between the through-hole and the main body. As a result, the arc-shaped reinforcing rib not only improves the strength of the area surrounding the first through-hole on the main body, but also improves the structural strength of the ejector pin fitting area. This makes the ejector pin fitting area less prone to deformation when subjected to the pressing force of the ejector pin, improving the mold release efficiency of the plastic component.

[0022] According to some embodiments of this application, the arc-shaped reinforcing rib extends along the circumferential direction of the ejector pin fitting region. The arc-shaped first reinforcing member can not only improve the structural strength of the region surrounding the ejector pin fitting region, but can also maintain uniform structural strength in the region surrounding the ejector pin fitting region.

[0023] According to some embodiments of the present application, a second through-hole for passing an electrode terminal is provided on the main body. The second through-hole penetrates the main body along the thickness direction, and at least a part of the first reinforcing member is located between the first through-hole and the second through-hole. Alternatively, there are a plurality of the first reinforcing members, and at least a part of the plurality of first reinforcing members is located between the first through-hole and the second through-hole. Thereby, the overall structural strength of the plastic member is improved, and it becomes easy to quickly release the plastic member by the ejector mechanism.

[0024] According to some embodiments of the present application, the main body has a first surface in the thickness direction, and the plastic member is provided to protrude from the first surface. , electric Further includes a convex portion for abutting against the electrode assembly, and the first through-hole is close to the convex portion. Since the first through-hole is close to the convex portion in the middle region of the plastic member, the structural strength of the region between the first through-hole and the convex portion in the middle region of the plastic member does not decrease too much.

[0025] According to some embodiments of the present application, a second through-hole for passing an electrode terminal is provided on the main body, and the first through-hole is located between the second through-hole and the convex portion. Therefore, not only can the structural strength of the peripheral region of the first through-hole be improved, but also the structural strength of the peripheral region of the second through-hole can be improved.

[0026] According to some embodiments of the present application, the first reinforcing member is provided on the first surface, and the protruding height of the first reinforcing member from the first surface is smaller than the protruding height of the convex portion from the first surface. Thereby, the space defined by the convex portion and the main body can be fully utilized, and the size of the structural member in the thickness direction does not become larger due to a protruding reinforcing member. component Thereby, the space defined by the convex portion and the main body can be fully utilized, and the size of the structural member in the thickness direction does not become larger due to a protruding reinforcing member.

[0027] According to some embodiments of the present application, the maximum length of the main body is a, the maximum width of the main body is b, and 150 mm ≤ a ≤ 500 mm, 20 mm ≤ b ≤ 150 mm are satisfied. Since the plastic member has a large and thin structure, the ratio of the volume of the plastic member to the space occupied by the battery cell is reduced, thereby improving the energy density of the battery cell.

[0028] According to some embodiments of the present application, 150 mm ≤ a ≤ 350 mm, 20 mm ≤ b ≤ 100 mm are satisfied. The plastic member has a large and thin structure, whereby the ratio of the volume of the plastic member to the space occupied by the battery cell is reduced, thereby improving the energy density of the battery cell.

[0029] According to some embodiments of the present application ,before Located in the end region and / or the intermediate region in the length direction of the main body Further equipped with a second reinforcing member Thereby, the structural strength of other regions of the main body except the vicinity region of the first through hole is improved, and the overall structural strength of the plastic member is improved.

[0030] According to some embodiments of the present application, the second reinforcing member includes a first reinforcing rib extending in the length direction and a second reinforcing rib extending in the width direction. By the intersection of the first reinforcing rib and the second reinforcing rib, the structural strength of the plastic member can be further improved, and the mold release efficiency of the plastic member can be improved.

[0031] According to some embodiments of the present application, a second through hole for passing an electrode terminal is provided on the main body, and one end of the first reinforcing rib extends to the edge of the second through hole. Thereby, the first reinforcing rib can improve the structural strength of the peripheral region of the second through hole, and thereby improve the overall structural strength of the plastic member.

[0032] In a second embodiment, the present invention provides an end cover assembly comprising: an end cover; an electrode terminal attached to the end cover; and the above-mentioned plastic member provided inside the end cover, the plastic member having a second through-hole on its main body for the electrode terminal to pass through.

[0033] According to some embodiments of this application, the main body has a first surface opposite to the end cover, the first reinforcing member is convex to the first surface, and the protrusion height of the first reinforcing member from the first surface is less than or equal to the protrusion height of the electrode terminal from the first surface. As a result, the reinforcing member can make full use of the space defined by the electrode terminal and the main body, and the size of the plastic member in the thickness direction does not increase further due to the protruding reinforcing member, that is, the energy density of the battery cell does not decrease because the reinforcing member is provided.

[0034] In a third embodiment, the embodiment of the present application provides a battery cell comprising the above-described end cover assembly.

[0035] In a fourth embodiment, the embodiment of this application provides a battery comprising the above-described battery cell.

[0036] In a fifth embodiment, the embodiment of the present application provides an electrical device equipped with the above-mentioned battery.

[0037] Additional aspects and advantages of this application are partially shown in the following description, and other parts will become apparent from the following description or be understood by practice of this application. [Brief explanation of the drawing]

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments are briefly introduced below. It should be understood that these drawings only illustrate one embodiment of this application and should not be considered limiting in scope. Those skilled in the art can obtain other relevant drawings based on these without any creative work.

[0039] [Figure 1] This is a schematic diagram of the vehicle provided in the first embodiment of this application. [Figure 2] This is a schematic diagram of the battery provided in the first embodiment of this application. [Figure 3] This is a schematic diagram of a battery cell provided in the first embodiment of this application. [Figure 4] This is a schematic diagram of a plastic member provided in the first embodiment of this application. [Figure 5] This is a schematic diagram of an end cover assembly in one direction provided in the first embodiment of this application. [Figure 6] This is a schematic diagram of the end cover assembly provided in the first embodiment of this application in another direction. [Figure 7] This is a cross-sectional view along the direction AA in Figure 5. [Figure 8] This is a magnified view of the area B enclosed by a circle in Figure 4. [Modes for carrying out the invention]

[0040] To further clarify the purpose, technical solutions, and advantages of the embodiments of this application, the technical solutions in the embodiments of this application are described below clearly and completely in conjunction with the accompanying drawings of the embodiments. Naturally, the embodiments described are not all of the embodiments of this application, but only a portion of them. Any other embodiments that can be obtained by a person skilled in the art without creative work based on the embodiments of this application are all within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as generally understood by those skilled in the art. In this application, terms used in the specification are solely for the purpose of describing specific embodiments and are not intended to limit this application. The terms “includes,” “equipped,” and any variations thereof in the specification and claims of this application, and in the brief description of the drawings above, are intended to cover non-exclusive inclusion. Terms such as “first,” “second,” etc., in the specification and claims of this application, or in the accompanying drawings above, are used to distinguish different subjects, not to describe a specific order or hierarchical relationship.

[0042] Where the “Examples” are referred to in this application, it means that certain features, structures, or properties described in conjunction with the Examples may be included in at least one Example of this application. The phrase “Examples” appearing in different parts of the specification does not necessarily refer to the same Example, nor does it refer to mutually exclusive, independent, or alternative Examples. It will be explicitly or implicitly understood by those skilled in the art that the Examples described in this application may be combined with other Examples.

[0043] In the description of this application, unless otherwise explicitly stated and limited, the terms “attachment,” “connection,” “joining,” and “mounting” should be understood in a broad sense, including, for example, fixed connections, removable connections, integral connections, direct connections, indirect connections via an intermediate medium, or internal connections between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0044] In this application, the term "and / or" simply describes the relationship between related objects and indicates that three relationships may exist. For example, A and / or B may indicate that there are three situations: A exists alone, A and B exist simultaneously, or B exists alone. In this application, the symbol " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0045] In this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple sheets" refers to two or more sheets (including two sheets).

[0046] In some embodiments, the battery may be a battery module. If there are multiple battery cells, the multiple battery cells are arranged and fixed together to form a single battery module.

[0047] In some embodiments, the battery may be a battery pack, which includes a box and battery cells, with the battery cells or battery modules housed within the box.

[0048] In some embodiments, the box may be part of the vehicle's chassis structure. For example, the box may be at least part of the vehicle's floor, or it may be at least part of the vehicle's cross members and side members.

[0049] In some embodiments, the battery may be an energy storage device. The energy storage device includes energy storage containers, energy storage cabinets, and the like.

[0050] In the embodiments of this application, the battery cell may be a secondary battery, which is a battery cell that can be used again by activating the active material by charging after discharge.

[0051] The battery cell may be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., but is not limited to these.

[0052] A battery cell generally comprises an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and removed by moving back and forth between the positive and negative electrodes. The separator is placed between the positive and negative electrodes and serves to prevent short circuits between them while allowing active ions to pass through.

[0053] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material provided on at least one of the surfaces of the positive electrode current collector.

[0054] For example, a positive electrode current collector has two opposing surfaces in its own thickness direction, and the positive electrode active material is provided on one or both of the two opposing surfaces of the positive electrode current collector.

[0055] For example, a metal foil or a composite current collector can be used as the positive electrode current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The composite current collector may include a polymer material substrate 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 (for example, a substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0056] For example, the positive electrode active material may include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. However, this application is not limited to these materials, and other conventional materials usable as positive electrode active materials for batteries may be used.

[0057] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0058] For example, a metal foil or composite current collector can be used as the negative electrode current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used.

[0059] In some embodiments, the negative electrode current collector has two opposing surfaces in the thickness direction of itself, and the negative electrode active material is provided on one or both of the two opposing surfaces of the negative electrode current collector.

[0060] For example, the negative electrode active material can be any negative electrode active material known in the art for batteries. For example, the negative electrode active material may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based material may be at least one selected from elemental silicon, silicon oxygen compounds, silicon carbon composites, silicon nitrogen composites, and silicon alloys. The tin-based material may be at least one selected from elemental tin, tin oxygen compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials usable as negative electrode active materials for batteries may be used. These negative electrode active materials may be used individually or in combination of two or more types.

[0061] In some embodiments, the separator is a separator film. In this application, the type of separator film is not particularly limited, and any known porous separator film having good chemical and mechanical stability can be selected.

[0062] For example, the main material of the separator film may be at least one selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator film may be a single-layer film or a multilayer composite film, and is not particularly limited. If the separator film is a multilayer composite film, the materials of each layer may be the same or different, and is not particularly limited. The separator may be located between the positive and negative electrodes as a standalone component, or it may be attached to the surfaces of the positive and negative electrodes.

[0063] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is placed between the positive and negative electrodes and simultaneously performs the roles of ion transport and positive-negative electrode isolation.

[0064] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte may be liquid, gel-like, or solid. Here, a liquid electrolyte comprises an electrolyte salt and a solvent.

[0065] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bisoxalate borate, lithium difluorobisoxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0066] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may be an ether-based solvent. The ether-based solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0067] Here, the gel-like electrolyte includes a polymer-based skeletal network, into which an ionic liquid-lithium salt is incorporated.

[0068] Here, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0069] For example, the polymer solid electrolyte may be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymer, polyionic liquid lithium salt, cellulose, etc.

[0070] For example, inorganic solid electrolytes may include one or more of oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphate sulfur, silver-germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0071] For example, composite solid electrolytes are formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0072] In some embodiments, the electrode assembly is a wound structure. A positive electrode sheet and a negative electrode sheet are wound together to form the wound structure.

[0073] In some embodiments, the electrode assembly has a layered structure.

[0074] In some embodiments, the battery cell may include a housing. The housing is used to package components such as electrode assemblies and electrolytes. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0075] In some embodiments, the housing comprises a case having an opening and an end cover that closes the opening to form a sealed space for housing materials such as an electrode assembly and an electrolyte. The case may have one or more openings. The end cover may also have one or more.

[0076] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to a tab of the electrode assembly. The electrode terminal may be directly connected to the tab or indirectly connected to the tab by an intermediate member. The electrode terminal may be provided on an end cover or on a case.

[0077] In some embodiments, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0078] For example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shape. A prismatic battery cell is a prismatic battery cell, a blade-shaped battery cell, or, for example, a hexagonal prismatic battery cell. cell Polygonal prism-shaped batteries such as cell This includes, but is not particularly limited to, the embodiments of this application.

[0079] The battery referred to in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0080] In some embodiments, the battery may be a battery module. If there are multiple battery cells, the multiple battery cells are arranged and fixed together to form a single battery module.

[0081] In some embodiments, the battery may be a battery pack, which includes a box and battery cells, with the battery cells or battery modules housed within the box.

[0082] In some embodiments, the box may be part of the vehicle's chassis structure. For example, the box may be at least part of the vehicle's floor, or it may be at least part of the vehicle's cross members and side members.

[0083] In some embodiments, the battery may be an energy storage device. The energy storage device includes energy storage containers, energy storage cabinets, and the like.

[0084] Batteries possess excellent advantages such as high energy density, low environmental pollution, high power density, long service life, wide range of applications, and low self-discharge coefficient, making them an important component in current new energy development.

[0085] In developing battery technology, it is necessary to simultaneously consider a wide range of design elements, such as performance parameters including energy density, discharge capacity, and charge / discharge rate, as well as the battery's mounting efficiency.

[0086] In the following embodiments, for the sake of clarity, the electrical equipment according to one embodiment of this application will be described as a vehicle 1000.

[0087] Referring to Figure 1, which is a schematic diagram of the structure of a vehicle provided in some embodiments of this application, the vehicle 1000 may be a fuel-powered vehicle, a natural gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be located at the bottom, top, or tail of the vehicle 1000. The battery 100 is used to supply power to the vehicle 1000, for example, as an operating power source for the vehicle 1000, used for the operating power requirements of the vehicle 1000's circuit systems, such as starting the vehicle 1000, navigation, and driving the vehicle 1000.

[0088] The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 for controlling the battery 100 to supply power to the motor 300, and is used, for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000.

[0089] In some embodiments of this application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but can also provide driving power to the vehicle 1000 as a drive power source for the vehicle 1000, in place of all or part of gasoline or natural gas.

[0090] Referring to Figure 2, which is an exploded view of a battery provided in some embodiments of the present application, the battery 100 comprises a box 10 and battery cells 20 housed in the box 10. Here, the box 10 provides a housing space for the battery cells 20 and can employ various structures. In some embodiments, the box 10 may comprise a first subbox 11 and a second subbox 12 that cover each other and together define a housing space for housing the battery cells 20. The second subbox 12 may be a hollow structure with one end open, and the first subbox 11 may be a plate-like structure. The first subbox 11 covers the open side of the second subbox 12 so that the first subbox 11 and the second subbox 12 together define a housing space. Both the first subbox 11 and the second subbox 12 may be hollow structures with one end open, and the open side of the first subbox 11 covers the open side of the second subbox 12.

[0091] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that among the multiple battery cells 20, there are both those connected in series and those connected in parallel. The multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection, and then the entire assembly of the multiple battery cells 20 may be housed in the box 10. Naturally, the battery 100 may first form a battery module by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then form a single unit by connecting multiple battery modules in series, in parallel, or in a mixed connection, and housed in the box 10. The battery 100 may further include other structures. For example, the battery 100 may further include busbar members for realizing electrical connections between the multiple battery cells 20.

[0092] Here, each battery cell 20 may be a secondary battery or a primary battery. Furthermore, the battery cell 20 may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these.

[0093] Referring to Figure 3, which is an exploded view of a battery cell provided in some embodiments of the present application, the battery cell 20 comprises a housing 21, an electrode assembly 22, and electrode terminals 25. The housing 21 comprises a case 211 and an end cover 212, the case 211 having an opening, and the end cover 212 closing the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0094] The case 211, together with the end cover 212, is a component that forms the internal environment of the battery cell 20, and the internal environment formed by them can be used to house the electrode assembly 22, electrolyte, and other components. The case 211 and the end cover 212 may be independent components. The case 211 may have various shapes and sizes. Specifically, the shape of the case 211 may be determined to match the specific shape and size of the electrode assembly 22. The case 211 may be made of various materials such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, but is not limited to these.

[0095] The end cover 212 refers to a component that covers the opening of the case 211, isolating the internal environment of the battery cell 20 from the external environment. The shape of the end cover 212 may, but is not limited to, conforming to the shape of the case 211 to match the case 211. Selectively, the end cover 212 may be manufactured from a material (e.g., aluminum alloy) that has a certain degree of hardness and strength so as to be resistant to deformation when pressed or impacted. This allows the battery cell 20 to have higher structural strength and can improve reliability to some extent. Functional components such as electrode terminals may be provided on the end cover 212. Electrode terminals may be used to electrically connect to the electrode assembly 22 in order to output or input electrical energy from the battery cell 20. The end cover 212 may be made from a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, but is not particularly limited to these materials in the embodiments of this application. In some embodiments, the inside of the end cover 212 may be further provided with an insulating structure that can isolate the end cover 212 from the electrical connecting members in the case 211, thereby reducing the risk of short circuits. Exemplarily, the insulating structure may be made of plastic, rubber, or the like.

[0096] The electrode assembly 22 is a component that undergoes an electrochemical reaction in the battery cell 20. The case 211 may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and generally a separator film is provided between the positive electrode sheet and the negative electrode sheet to separate them and prevent internal short circuits between them. The portions of the positive electrode sheet and the negative electrode sheet that have active material constitute the main body of the electrode assembly, and the portions of the positive electrode sheet and the negative electrode sheet that do not have active material each constitute a tab. The positive electrode tab and the negative electrode tab may both be located at one end of the main body, or they may each be located at both ends of the main body. During charging and discharging of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals to form an electric current circuit.

[0097] Batteries are widely used in fields such as portable electronic devices, electric transportation, power tools, drones, and energy storage devices. Here, the energy density of a battery directly determines its energy storage capacity. The higher the energy density of a battery, the greater the amount of electricity it can store for the same volume. This allows for increased usage time of electrical devices after the battery is installed.

[0098] The thickness of the end cover assembly and the case can affect the energy density of the battery. Therefore, as the demands for battery energy density increase, the thickness of the end cover assembly and the case are becoming thinner and thinner. On the other hand, the structural members located inside the end cover (i.e., the lower plastic of the battery) are also becoming thinner and thinner as part of the end cover assembly.

[0099] However, the thinner the structural member, the more difficult it becomes to produce it. Specifically, this is reflected as follows: After injection molding the structural member, because the structure is thin and has low structural strength, the structural member deforms significantly during the ejector mechanism process. In particular, the area around the contact point with the ejector pin is prone to deformation, which makes it difficult to eject the structural member, reduces the mold release efficiency of the structural member, and can even cause damage to the structural member during ejection.

[0100] Therefore, this application proposes a structural member 23 in which strength is significantly improved, thereby significantly improving demolding efficiency and reducing the damage rate during demolding.

[0101] As shown in Figure 4, the structural member 23 in the embodiment of this application may include a main body 231 and a reinforcing member.

[0102] The main body 231 may be configured as a plate-like structure. An insulating material such as plastic may be used for the main body 231. In order for the battery cell 20 to have a higher energy density, the thickness of the structural member 23 or the main body 231 is relatively thin, and the main body 231 has a thin structure. A receiving region that can receive applied force is provided on the main body 231. For example, during demolding, the ejector pin can come into contact with the receiving region, and the ejector pin can apply force to the receiving region, thereby separating the structural member 23 from the mold.

[0103] The receiving region may have a mark, for example, the mark may be etched onto the receiving region or coated onto the receiving region, provided that the mark facilitates contact between the ejector pin and the receiving region after the receiving region has been marked. The receiving region may also be a groove of a certain depth, which allows the ejector pin to easily fit into the groove, thereby not only achieving contact between the ejector pin and the receiving region but also serving a positioning function.

[0104] This application does not limit the type of mark on the receiving area, as long as the mark on the receiving area allows the ejector pin to easily contact the receiving area.

[0105] The reinforcing member is fixed to the main body 231. The reinforcing member may be a separate structure from the main body 231, or it may be fixed to the main body 231 by adhesive or heat melting. The reinforcing member may be an integrally molded member with the main body 231, for example, the reinforcing member may be injection molded integrally with the main body 231.

[0106] At least a portion of the reinforcing member is provided around the receiving region, thereby allowing the reinforcing member to improve the structural strength of the receiving region. The reinforcing member may be adjacent to the receiving region or extend to the receiving region, as long as it does not affect the application of the force to the receiving region.

[0107] The reinforcing member may be a reinforcing rib, which may protrude from the surface of the main body 231 and surround the receiving area. The reinforcing member may be a reinforcing bump, which may be multiple reinforcing bumps, which may surround the receiving area.

[0108] Furthermore, the structural member 23 may be made of plastic material; that is, the structural member 23 may be a plastic member, and the structural member 23 and the plastic member in the embodiments of this application refer to the same member.

[0109] A first through-hole 202 may be provided on the main body 231. The first through-hole 202 may penetrate the main body 231 along the thickness direction of the main body 231. The reinforcing member may include a first reinforcing member 232a provided on the main body 231. The first reinforcing member 232a may be provided on at least one of the two sides of the main body 231 in the thickness direction. The first reinforcing member 232a may protrude from the surface of the main body 231, be located around the first through-hole 202, or be close to the first through-hole 202.

[0110] In other words, the first reinforcing member 232a may be configured as a reinforcing rib, thereby improving the structural strength of the main body 231, and in particular improving the structural strength of the area surrounding the first through hole 202 on the main body 231. As a result, when the ejector pin presses against the area surrounding the first through hole 202 on the main body 231 to perform demolding, the amount of deformation of the area surrounding the first through hole 202 on the main body 231 can be reduced, thereby making it easier to eject the plastic member and improving the demolding efficiency of the plastic member.

[0111] According to the embodiment of the present application, a reinforcing member is provided on the main body 231, and the reinforcing member is provided at least partially around the receiving region. This allows the reinforcing member to not only improve the overall structural strength of the structural member 23, but, most importantly, to significantly improve the structural strength of the receiving region and the surrounding region. As a result, when a force is applied to the receiving region, for example, in the process of demolding when an ejector pin comes into contact with the receiving region, the amount of deformation of the surrounding region of the receiving region is reduced, and furthermore, the amount of deformation of the entire structural member 23 is reduced. This facilitates the smooth demolding of the structural member 23 by the ejector pin, and improves the demolding efficiency of the structural member 23.

[0112] In some embodiments of this application, as shown in Figure 7, the thickness of the main body 231 is denoted as t, satisfying the condition 0.1 mm ≤ t ≤ 1.0 mm. For example, the thickness t of the main body 231 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1.0 mm. By satisfying the above range for the thickness of the main body 231, the overall thickness of the structural member 23 can be reduced, and the ratio of the volume of the structural member 23 to the space occupied by the battery cell 20 can be reduced, thereby improving the energy density of the battery cell 20. The above values ​​for the thickness of the main body 231 are merely general embodiments, and as long as the thickness of the main body 231 falls within the above range, it is within the scope of protection of this application.

[0113] According to some embodiments of this application, the thickness of the main body 231 is denoted as t, satisfying the condition 0.1 mm ≤ t ≤ 0.6 mm. For example, the thickness t of the main body 231 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or 0.6 mm. That is, the thickness of the main body 231 can be further reduced, thereby reducing the overall thickness of the structural member 23, reducing the ratio of the volume of the structural member 23 to the space occupied by the battery cell 20, and improving the energy density of the battery cell 20. The above values ​​for the thickness of the main body 231 are merely general embodiments, and as long as the thickness of the main body 231 falls within the above range, it is within the scope of protection of this application.

[0114] In some embodiments of this application, as shown in Figure 5, the maximum length of the main body 231 is a, the maximum width of the main body 231 is b, and the conditions 150 mm ≤ a ≤ 500 mm and 20 mm ≤ b ≤ 150 mm are satisfied.

[0115] The main body 231 may be configured as a rectangular plate-like structure such that its length is the maximum length and its width is the maximum width. Of course, the main body 231 may also be an oval structure, as long as it is guaranteed that the structural member 23 can perform its role in separating the end cover 212 and the electrode assembly 22.

[0116] In some embodiments of this application, the maximum length of the main body 231 may be 150 mm, 180 mm, 210 mm, 240 mm, 270 mm, 310 mm, 340 mm, 350 mm, 380 mm, 410 mm, 440 mm, 470 mm, or 500 mm, and the maximum width of the main body 231 may be 20 mm, 40 mm, 60 mm, 80 mm, 100 mm, 120 mm, 140 mm, or 150 mm. The maximum length and width of the main body 231, by satisfying the above ranges, can serve to isolate the end cover 212 from the electrode assembly 22. Combined with the thickness of the main body 231, the large and thin structure of the plastic member reduces the ratio of the volume of the structural member 23 to the space occupied by the battery cell 20, thereby improving the energy density of the battery cell 20. The length and width values ​​of the main body 231 described above are merely general examples of the maximum length and width of the main body 231, and as long as the maximum length and width of the main body 231 fall within the respective ranges described above, it is within the scope of protection of this application.

[0117] In some embodiments of this application, the maximum length of the main body 231 is denoted as a, the maximum width of the main body 231 as b, and the following conditions are met: 150 mm ≤ a ≤ 350 mm and 20 mm ≤ b ≤ 100 mm. For example, the maximum length of the main body 231 may be 150 mm, 180 mm, 210 mm, 240 mm, 270 mm, 310 mm, 340 mm, or 350 mm, and the maximum width of the main body 231 may be 20 mm, 40 mm, 60 mm, 80 mm, or 100 mm. This not only ensures that the structural member 23 is large and thin, but also reduces the ratio of the volume of the structural member 23 to the space occupied by the battery cell 20, thereby improving the energy density of the battery cell 20. Furthermore, the strength of the structural member 23 itself will not be too low due to the length and width of the main body 231 being excessively long. The length and width values ​​of the main body 231 described above are merely general examples of the maximum length and width of the main body 231, and as long as the maximum length and width of the main body 231 fall within the respective ranges described above, it is within the scope of protection of this application.

[0118] In some embodiments of this application, there are multiple first reinforcing members 232a, and these multiple first reinforcing members 232a are provided at intervals along the circumferential direction of the first through-hole 202. By machining the first through-hole 202 on the main body 231, the strength of the area surrounding the first through-hole 202 on the main body 231 decreases. Therefore, by providing multiple first reinforcing members 232a at intervals along the circumferential direction of the first through-hole 202, it is possible not only to improve the structural strength of the area surrounding the first through-hole 202 on the main body 231, but also to make the structural strength of the area surrounding the first through-hole 202 on the main body 231 consistent.

[0119] In some embodiments of this application, as shown in Figures 4 and 8, the first reinforcing member 232a is an arc-shaped reinforcing rib. An arc-shaped reinforcing rib can improve the structural strength around the first through-hole 202 on the main body 231 more than a straight reinforcing rib. As a result, when the ejector pin presses against the area around the first through-hole 202 on the main body 231 to perform demolding, the amount of deformation of the area around the first through-hole 202 on the main body 231 can be reduced, thereby making it easier to eject the plastic member and improving the demolding efficiency of the plastic member.

[0120] According to some embodiments of this application, the first reinforcing member 232a is an arc-shaped reinforcing rib rather than an annular reinforcing rib, and the arc-shaped reinforcing rib has a first opening, which may be located on the opposite side from the first through-hole. That is, the arc-shaped reinforcing rib protrudes toward the direction of the first through-hole. This further improves the structural strength of the area surrounding the first through-hole 202 on the main body 231.

[0121] In some embodiments of this application, as shown in Figure 8, the radian of the arc-shaped reinforcing rib is denoted as α, satisfying 90° ≤ α ≤ 270°. For example, the radian of the arc-shaped reinforcing rib may be 90°, 120°, 150°, 180°, 210°, 240°, or 270°. By satisfying the above range for the radian of the arc-shaped reinforcing rib, not only can the structural strength of the area surrounding the first through-hole 202 on the main body 231 be improved, but the difficulty of processing the arc-shaped reinforcing rib is also reduced because it is not completely closed, thereby improving the production efficiency of the plastic member.

[0122] In some embodiments of this application, the radian α of the arc-shaped reinforcing rib satisfies 135° ≤ α ≤ 225°, for example, the radian of the arc-shaped reinforcing rib may be 135°, 145°, 155°, 165°, 175°, 185°, 195°, 205°, 215°, or 225°. By having the radian of the arc-shaped reinforcing rib satisfy the above range, not only can the structural strength of the area surrounding the first through hole 202 on the main body 231 be improved, but the difficulty of processing the arc-shaped reinforcing rib is also reduced because it is not completely closed, thereby improving the production efficiency of the plastic member.

[0123] In some embodiments of this application, the radius of the arc-shaped reinforcing rib is R1, satisfying 0.5 mm ≤ R1 ≤ 5 mm. For example, the radius of the arc-shaped reinforcing rib may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm. By satisfying the above conditions for the radius of the arc-shaped reinforcing rib, not only can the area occupied by the arc-shaped reinforcing rib on the main body 231 be reduced, but in combination with the above conditions for the radian α of the arc-shaped reinforcing rib, the overall structure of the arc-shaped reinforcing rib becomes more compact. A compact arc-shaped reinforcing rib significantly improves the structural strength of the area surrounding the first through-hole 202 of the main body 231 compared to a larger arc-shaped reinforcing rib, and the improvement in strength of the area surrounding the first through-hole 202 is also made more uniform. This improves the overall structural strength of the main body 231, facilitates the rapid and damage-free ejection of the plastic member by the ejector mechanism, and makes it easier to demold the plastic member.

[0124] In some embodiments of this application, the radius R1 of the arc-shaped reinforcing rib satisfies 1 mm ≤ R1 ≤ 4 mm. For example, the radius of the arc-shaped reinforcing rib may be 1 mm, 1.3 mm, 1.6 mm, 1.9 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3.1 mm, 3.4 mm, 3.7 mm, or 4 mm. By satisfying the above condition for the radius of the arc-shaped reinforcing rib, not only can the area occupied by the arc-shaped reinforcing rib on the main body 231 be reduced, but in combination with the above condition for the radian α of the arc-shaped reinforcing rib, the overall structure of the arc-shaped reinforcing rib becomes more compact. A compact arc-shaped reinforcing rib can improve the structural strength of the area surrounding the first through-hole 202 of the main body 231 more significantly than an arc-shaped reinforcing rib with a larger volume. This improves the overall structural strength of the main body 231, facilitates the rapid and damage-free ejection of the plastic member by the ejector mechanism, and makes it easier to demold the plastic member.

[0125] Of course, the radius of the arc-shaped reinforcing rib described above is only one example of this application, and as long as the radius of the arc-shaped reinforcing rib satisfies the above numerical range, it is within the scope of protection of this application.

[0126] Furthermore, the radius of the arc-shaped reinforcing rib means that the virtual circle formed by that radius and the center of the circle is located exactly midway along the thickness direction of the arc-shaped reinforcing rib.

[0127] In some embodiments of this application, the radius of the arc-shaped reinforcing rib is R1, the radius of the first through hole is R2, and the condition 0.06 ≤ R1 / R2 ≤ 1.67 is satisfied. For example, R1 / R2 may be 0.06, 0.08, 0.10, 0.3, 0.5, 0.7, 0.9, 1.1, 1.2, 1.3, 1.4, 1.5, or 1.67. This eliminates the problem that arises when the radius of the arc-shaped reinforcing rib is too small compared to the radius of the first through-hole 202, requiring a large number of arc-shaped reinforcing ribs to maintain nearly the same strength in the area surrounding the first through-hole 202 on the main body 231. This not only avoids the increased difficulty in processing the plastic component, but also eliminates the problem that arises when the radius of the arc-shaped reinforcing rib is too small compared to the radius of the first through-hole 202, resulting in only a small number of arc-shaped reinforcing ribs being placed in the area surrounding the first through-hole 202 on the main body 231, and thus the strength of the area surrounding the first through-hole 202 not matching.

[0128] In some embodiments of this application, the radius of the arc-shaped reinforcing rib is R1, the radius of the first through-hole is R2, and the condition 0.2 ≤ R1 / R2 ≤ 1 is satisfied. .example For example, R1 / R2 may be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1. This eliminates the problem that arises when the radius of the arc-shaped reinforcing rib is too small compared to the radius of the first through-hole 202, requiring a large number of arc-shaped reinforcing ribs to maintain approximately the same strength in the area surrounding the first through-hole 202 on the main body 231, thereby increasing the difficulty of processing the plastic member. Furthermore, it also eliminates the problem that arises when the radius of the arc-shaped reinforcing rib is too small compared to the radius of the first through-hole 202, resulting in only a small number of arc-shaped reinforcing ribs being placed in the area surrounding the first through-hole 202 on the main body 231, and thus the strength of the area surrounding the first through-hole 202 not matching.

[0129] The ratio of the radius R1 of the arc-shaped reinforcing rib to the radius R2 of the first through-hole in this application is only applicable to some embodiments of this application, and the ratio of the radius R1 of the arc-shaped reinforcing rib to the radius R2 of the first through-hole is protected by this application as long as it satisfies the above range.

[0130] According to some embodiments of this application, as shown in Figure 4, a first through-hole 202 is provided on the main body 231, the first through-hole 202 may penetrate the main body along the thickness direction of the main body, the receiving region includes a first receiving region 201a located on the outer circumference of the first through-hole 202, and the reinforcing member includes a first reinforcing member 232a located on the outer circumference of the first receiving region 201a.

[0131] Furthermore, the first receiving region 201a can be pressed by the ejector pin during the release of the plastic member, thereby allowing the ejector pin to apply force to the plastic member and separate it from the mold.

[0132] In the embodiment of this application, the first receiving region 201a is the ejector pin fitting region, and the first receiving region 201a and the ejector pin fitting region refer to the same region. The ejector pin fitting region is close to the first through hole 202, and the arc-shaped reinforcing rib is located between the ejector pin fitting region and the first through hole 202. As a result, the arc-shaped reinforcing rib is located in the first through hole 20 on the main body 231 2 This not only improves the strength of the surrounding area, but also improves the structural strength of the ejector pin fitting area. As a result, the ejector pin fitting area is less likely to deform when subjected to the pressing force of the ejector pin, and the release efficiency of the plastic member 23 is improved.

[0133] The first through-hole 202 may be configured as an electrolyte injection hole. When the electrode assembly 22 is placed inside the case and the end cover 212 closes the opening of the case, the electrolyte can be injected into the case through the electrolyte injection hole. The shape of the first through-hole 202 may be circular, rectangular, or other shapes, as long as the electrolyte injection process proceeds smoothly. The first through-hole 202 may be located in the intermediate region 204 or the end region 203 of the body 231. This application does not particularly limit the position of the first through-hole 202 on the body 231.

[0134] The first receiving region 201a is located on the outer periphery of the first through-hole 202; that is, the first receiving region 201a is in close proximity to the first through-hole 202. Since the first through-hole 202 is provided on the main body 231, the structural strength near the first through-hole 202 is lower, and therefore, it is necessary to strengthen the strength of the region surrounding the first through-hole 202.

[0135] In the embodiment of this application, by providing the first reinforcing member 232a in the area surrounding the first through hole 202, the first reinforcing member 232a can improve the structural strength of the area surrounding the first receiving area 201a (i.e., the ejector pin fitting area). Understandably, the main body 231 includes areas other than the area surrounding the first receiving area 201a, and reinforcing members may also be provided in the other areas, and the reinforcing members in the other areas may extend to the area surrounding the first receiving area 201a. Thus, assuming that the structural strength of the area surrounding the first receiving area 201a is strengthened by the reinforcing members in the other areas, the first reinforcing member 232a can further improve the structural strength of the area surrounding the first receiving area 201a.

[0136] In some embodiments of this application, as shown in Figure 4, at least a portion of the first reinforcing member 232a is located between the first through hole 202 and the first receiving region 201a. That is, a portion of the first reinforcing member 232a may be located between the first through hole 202 and the first receiving region 201a, and another portion may be located only on the outer periphery of the first receiving region 201a, or the entire first reinforcing member 232a may be located between the first through hole 202 and the first receiving region 201a. This not only improves the structural strength of the region surrounding the first receiving region 201a, but also improves the structural strength of the region surrounding the first through hole 202.

[0137] For example, the first reinforcing member 232a may be configured as an annular structure surrounding the first receiving region 201a, with a portion located between the first through-hole 202 and the first receiving region 201a, and another portion located only on the outer circumference of the first receiving region 201a. Of course, the first reinforcing member 232a may also be configured as a plurality of spaced-apart protrusions, with a portion located between the first through-hole 202 and the first receiving region 201a, and another portion located only on the outer circumference of the first receiving region 201a.

[0138] In some embodiments of this application, both the first receiving regions 201a and the first reinforcing members 232a are multiple and correspond one-to-one. The multiple first receiving regions 201a are provided at intervals around the outer circumference of the first through-hole 202, and a corresponding first reinforcing member 232a is provided between each first receiving region 201a and the first through-hole 202. This not only improves the structural strength of the region surrounding the first receiving region 201a, but also improves the structural strength of the region surrounding the first through-hole 202.

[0139] Similarly, at least a portion of each first reinforcing member 232a may be provided between the corresponding first receiving region 201a and the first through hole 202. The structure or arrangement of the first reinforcing members 232a is as described above and will not be described in detail herein.

[0140] In some embodiments of this application, the multiple first reinforcing members 232a may be separate structures, and a portion of each first reinforcing member 232a may be provided between the corresponding first receiving region 201a and the first through hole 202. For example, the first reinforcing member 232a may be configured in an annular shape and provided surrounding the corresponding first receiving region 201a.

[0141] In some other embodiments of this application, the plurality of first reinforcing members 232a may be separate structures, and each first reinforcing member 232a may be provided between the corresponding first receiving region 201a and the first through hole 202, or the plurality of first reinforcing members 232a may belong to a part of an annular structure surrounding the first through hole 202, and at least a part of each first reinforcing member 232a may be provided between the corresponding first receiving region 201a and the first through hole 202.

[0142] According to some embodiments of this application, the first reinforcing member 232a is configured in an arc shape and extends along the circumferential direction of the first receiving region 201a. For example, the first reinforcing member 232a may be an arc-shaped reinforcing rib, and the arc-shaped reinforcing rib may extend along the circumferential direction of the first receiving region 201a (i.e., the ejector pin fitting region). The arc-shaped first reinforcing member 232a can not only improve the structural strength of the area surrounding the first receiving region 201a, but can also maintain uniform structural strength in the area surrounding the first receiving region 201a. Of course, the first reinforcing member 232a may also be configured as a plurality of protruding structures, and the plurality of protruding structures may be provided on the outer circumference of the first receiving region 201a along an arc-shaped trajectory, thereby not only improving the structural strength of the area surrounding the first receiving region 201a, but also maintaining uniform structural strength in the area surrounding the first receiving region 201a.

[0143] It is understandable that the first reinforcing member 232a may be configured in an annular shape. In this case, the annular first reinforcing member 232a may surround the outer periphery of the first receiving region 201a. This maximizes the structural strength of the first receiving region 201a. Of course, the first reinforcing member 232a may be configured as a plurality of protruding structures, and the plurality of protruding structures may be provided on the outer periphery of the first receiving region 201a along an annular trajectory. The first reinforcing member 232a may have other shapes. This application does not limit the specific shape of the first reinforcing member 232a, as long as it is guaranteed that the first reinforcing member 232a is provided on the outer periphery of the first receiving region 201a in order to improve the structural strength of the surrounding region of the first receiving region 201a.

[0144] In some embodiments of this application, as shown in Figures 4 and 6, the receiving region includes a second receiving region 201b located in the end region 203 and / or intermediate region 204 in the first direction of the main body 231, and the reinforcing member comprises a second reinforcing member 232b located in the end region 203 and / or intermediate region 204.

[0145] The location of the second receiving region 201b can be understood as the other region on the main body 231 excluding the first receiving region 201a, and this region may include the end region 203 and the intermediate region 204 in the first direction. An external force may be applied to the second receiving region 201b, thereby allowing the structural member 23 to be demolded along with the external force on the first receiving region 201a. Of course, in order to mitigate the problem of excessive deformation of the region near the second receiving region 201b when the second receiving region 201b is subjected to an external force, a second reinforcing member 232b can be provided in the region near the second receiving region 201b, or in the end region 203 and / or intermediate region 204 of the main body 231 in the first direction, thereby improving the structural strength of the region near the second receiving region 201b and improving the overall structural strength of the structural member 23.

[0146] In some embodiments of this application, as shown in Figure 4, the second reinforcing member 232b comprises a first reinforcing rib 232b1 extending in a first direction X and a second reinforcing rib 232b2 extending in a second direction Y, with the first direction X and the second direction Y intersecting.

[0147] The first reinforcing rib 232b1 and the second reinforcing rib 232b2 may be configured as elongated structures. The first reinforcing rib 232b1 may protrude from the outer surface of the main body 231, and the second reinforcing rib 232b2 may also protrude from the outer surface of the main body 231. The first reinforcing rib 232b1 and the second reinforcing rib 232b2 may be fixed to the main body 231 by adhesive, heat melting, etc. Of course, the first reinforcing rib 232b1 and the second reinforcing rib 232b2 may be molded integrally with the main body 231. By providing the first reinforcing rib 232b1 and the second reinforcing rib 232b2 on the main body 231, the structural strength of the structural member 23 can be improved, thereby reducing deformation of the structural member 23 when an external force is applied to the receiving area and improving the release efficiency of the structural member 23. Furthermore, the intersection of the first reinforcing rib 232b1 and the second reinforcing rib 232b2 further improves the structural strength of the structural member 23 and enhances the release efficiency of the structural member 23.

[0148] In some embodiments of this application, a second through-hole 205 is provided on the main body 231 for passing the electrode terminal 25, and one end of the first reinforcing rib 232b1 extends to the edge of the second through-hole 205. As a result, the first reinforcing rib 232b1 can improve the structural strength of the area surrounding the second through-hole 205, thereby improving the overall structural strength of the structural member 23.

[0149] Of course, one end of the second reinforcing rib 232b2 may also extend to the edge of the second through-hole 205, thereby improving the structural strength of the area surrounding the second through-hole 205, and thereby improving the overall structural strength of the structural member 23.

[0150] In some embodiments of this application, there are multiple first reinforcing ribs 232b1 and multiple second reinforcing ribs 232b2, and all of the multiple first reinforcing ribs 232b1 may extend in a first direction X, and all of the multiple second reinforcing ribs 232b2 may extend in a second direction Y. As a result, the multiple first reinforcing ribs 232b1 and the multiple second reinforcing ribs 232b2 form an alternating grid structure, thereby further improving the overall structural strength of the structural member 23.

[0151] In some embodiments of this application, the second through-hole 205 penetrates the main body 231 along the thickness direction of the main body 231, and at least a portion of the first reinforcing member 232a is located between the first through-hole 202 and the second through-hole 205. That is, since the first through-hole 202 and the second through-hole 205 are provided on the main body 231, the strength of the area on the main body 231 adjacent to the first through-hole 202 and the second through-hole 205 is reduced. However, by providing the first reinforcing member 232a between the first through-hole 202 and the second through-hole 205, not only is the structural strength of the area on the main body 231 adjacent to the first through-hole 202 improved, but the structural strength of the area on the main body 231 adjacent to the second through-hole 205 is also improved. As a result, the overall structural strength of the plastic member is improved, and it becomes easier to quickly demold the plastic member using the ejector mechanism.

[0152] In some other embodiments of this application, there are multiple first reinforcing members 232a, and at least some of the multiple first reinforcing members 232a are located between the first through-hole 202 and the second through-hole 205. This improves not only the structural strength of the surrounding area on the main body 231 that is close to the first through-hole 202, but also the structural strength of the surrounding area on the main body 231 that is close to the second through-hole 205. This improves the overall structural strength of the plastic member and makes it easier to quickly demold the plastic member using the ejector mechanism.

[0153] In some embodiments of this application, the main body 231 has a first surface 206 in the thickness direction, and both the receiving region and the reinforcing member are provided on the first surface 206. That is, both the receiving region and the reinforcing member are provided on the same surface of the main body 231 in the thickness direction. As a result, one surface of the main body 231 in the thickness direction does not need to have a reinforcing member protruding from that surface, thereby ensuring that the surface can be stably attached to the member to be attached.

[0154] Of course, the receiving region and the reinforcing member may each be provided on two sides in the thickness direction of the main body 231, as long as it is guaranteed that the reinforcing member can improve the structural strength of the region surrounding the receiving region.

[0155] In some embodiments of this application, the main body 231 has a first surface 206 on which reinforcing members are provided in the thickness direction. That is, the reinforcing members are configured as reinforcing ribs or reinforcing projections, and the reinforcing ribs and projections can improve the structural strength of the area surrounding the receiving region and ensure that the mold can be smoothly released by the reinforcing members under the action of external forces.

[0156] In some embodiments of this application, as shown in Figures 4 to 7, the structural member 23 is convex on the first surface 206 and further includes a protrusion 233 for contacting the electrode assembly 22, wherein the protrusion height of the reinforcing member from the first surface 206 is smaller than the protrusion height of the protrusion 233 from the first surface 206.

[0157] After the end cover 212 closes the opening of the case, the protrusion 233 can come into contact with the electrode assembly 22, thereby reducing the amount of vibration of the electrode assembly 22 within the case and ensuring the overall stability of the battery cell 20. The protrusion height of the reinforcing member from the first surface 206 is smaller than the protrusion height of the protrusion 233 from the first surface 206. For example, the first reinforcing member 232a is provided on the first surface 206, and the protrusion height of the first reinforcing member 232a from the first surface 206 is smaller than the protrusion height of the protrusion 233 from the first surface 206. This allows for full utilization of the space defined by the protrusion 233 and the main body 231, and the size of the structural member 23 in the thickness direction does not increase further due to the protruding reinforcing member.

[0158] In some embodiments of this application, the plastic member further includes a projection 233 on a first surface for contacting the electrode assembly 22, and the first through hole 202 is adjacent to the projection 233. Specifically, there may be three projections 233, two of which are located at both ends in the longitudinal direction of the plastic member, and the other projection 233 is located in the intermediate region in the longitudinal direction of the plastic member. The first through hole 202 is also adjacent to the projection 233 in the intermediate region in the longitudinal direction of the plastic member. Because the first through hole 202 is adjacent to the projection 233 in the intermediate region of the plastic member, the structural strength of the region between the first through hole 202 and the projection 233 in the intermediate region of the plastic member is not reduced too much.

[0159] In some embodiments of this application, the first through-hole 202 is located between the second through-hole 205 and the protrusion 233. For example, the first through-hole 202 is located between the second through-hole 205 and the protrusion 233 in the intermediate region in the longitudinal direction of the plastic member. Since the first reinforcing member 232a is provided in the region surrounding the first through-hole 202, not only can the structural strength of the region surrounding the first through-hole 202 be improved, but the structural strength of the region surrounding the second through-hole 205 can also be improved.

[0160] In some embodiments of this application, the structural member 23 is made of an insulating material and is used to separate the end cover 212 of the battery cell 20 from the electrode assembly 22. The insulating material may be made of a plastic member. The insulating structural member 23 can completely separate the electrode assembly 22 from the end cover 212, reducing the probability of contact between the electrode assembly 22 and the end cover 212, thereby effectively reducing the probability of electrical connection between the electrode assembly 22 and the end cover 212.

[0161] The end cover assembly 210 according to the embodiment of this application will be briefly described below.

[0162] The end cover assembly 210 according to the embodiment of this application may include an end cover 212, an electrode terminal 25 attached to the end cover 212, and a structural member 23 as described in the above embodiment, which is provided on the inner surface of the end cover 212 and has a second through hole 205 on its main body 231 for passing the electrode terminal 25 through.

[0163] The end cover 212 has an inner surface facing the electrode assembly 22 and an outer surface opposite to the electrode assembly 22, and the thickness direction of the main body 231 is the same as the thickness direction of the end cover 212. In the embodiment of this application, since the structural member 23 is provided on the inner surface of the end cover 212, the thickness of the structural member 23 is reduced, which not only improves the energy density of the battery cell 20, but the structural member 23 also has a certain strength, and when an external force is applied to the structural member 23, the amount of deformation of the area around the receiving area is reduced, and the demolding process of the structural member 23 becomes smoother.

[0164] In some embodiments of this application, the main body 231 has a first surface 206 opposite to the end cover 212, and the reinforcing member is convex on the first surface 206, with the height of the reinforcing member protruding from the first surface 206 being less than or equal to the height of the electrode terminal 25 protruding from the first surface 206. For example, the first reinforcing member 232a is convex on the first surface 206, with the height of the first reinforcing member 232a protruding from the first surface 206 being less than or equal to the height of the electrode terminal 25 protruding from the first surface 206. As a result, the reinforcing member can make full use of the space defined by the electrode terminal 25 and the main body 231, and the size of the structural member 23 in the thickness direction does not increase further due to the protruding reinforcing member, that is, the energy density of the battery cell 20 does not decrease because the reinforcing member is provided.

[0165] The following is a brief description of the battery cell 20 according to the embodiment of this application.

[0166] The battery cell 20 according to the embodiment of this application includes the end cover assembly 210 according to the embodiment. Because the battery cell 20 according to the embodiment of this application is provided with the end cover assembly 210, the battery cell 20 has a high energy density, and the thinness of the structural member 23 in the battery cell 20 does not cause a decrease in production efficiency.

[0167] The following is a brief description of the battery 100 according to the embodiment of this application.

[0168] The battery 100 according to the embodiment of this application comprises the battery cell 20 according to the embodiment described above. Because the battery 100 according to the embodiment of this application is provided with the battery cell 20 described above, the battery 100 has a high energy density, and the thinness of the structural member 23 in the battery 100 prevents a decrease in production efficiency.

[0169] The following is a brief description of the electrical equipment according to the embodiment of this application.

[0170] The electrical device according to the embodiment of this application is equipped with the battery 100 according to the embodiment described above. Because the electrical device according to the embodiment of this application is provided with the battery 100 described above, the operating time of the electrical device is extended, and the consumer's user experience is improved.

[0171] The battery cell 20 disclosed in the embodiments of this application can be used in, but is not limited to, electrical equipment such as vehicles, ships, or aircraft. The battery cell 20, battery, etc. disclosed in this application can be used to configure a power supply system for such electrical equipment.

[0172] Embodiments of this application provide an electrical device that uses a battery cell 20 as a power source. The electrical device may be, but is not limited to, a mobile phone, tablet PC, laptop computer, electric toy, power tool, electric motorcycle, electric two-wheeler, electric car, ship, aircraft, etc. Here, electric toys may include, for example, fixed or portable electric toys such as game consoles, electric car toys, electric boat toys and electric airplane toys, and aircraft may include airplanes, rockets, space shuttles and spacecraft, etc.

[0173] While this application has been described with reference to preferred embodiments, various improvements can be made without departing from the scope of this application, and components therein can be replaced with equivalents. In particular, any of the technical features described in each embodiment can be arbitrarily combined, provided that there is no structural inconsistency. This application is not limited to the specific embodiments disclosed herein and includes all technical solutions that fall within the claims. [Explanation of symbols]

[0174] 1000 vehicles 100 batteries 200 controllers 300 motor 10 boxes 20 battery cells 11. First subbox 12 Second Subbox 21 Housing 22 Electrode Assembly 25 electrode terminal 211 cases 212 End Cover 210 End Cover Assembly 23 Plastic parts 231 main unit 232a First reinforcing member 232b Second reinforcing member 232b1 First Reinforcement Rib 232b2 Second Reinforcement Rib 233 protrusions a Maximum length of the main body b main body maximum width t body thickness X 1st direction Y second direction 201a First receptive area 201b Second Receptor Area 202 First through hole 203 end area 204 intermediate area 205 Second through hole 206 1st surface

Claims

1. A plate-shaped body having a first through-hole that penetrates the body along the thickness direction, A plastic member characterized by comprising: a first reinforcing member provided on the main body, protruding from the surface of the main body, located around the first through hole, and adjacent to the first through hole.

2. The plastic member according to claim 1, characterized in that the thickness of the main body is t, and the condition 0.1 mm ≤ t ≤ 1.0 mm is satisfied.

3. The plastic member according to claim 2, characterized in that it satisfies the condition 0.1 mm ≤ t ≤ 0.6 mm.

4. The plastic member according to any one of claims 1 to 3, characterized in that there are a plurality of first reinforcing members, and the plurality of first reinforcing members are provided at intervals along the circumferential direction of the first through hole.

5. The plastic member according to any one of claims 1 to 4, characterized in that the first reinforcing member is an arc-shaped reinforcing rib.

6. The plastic member according to claim 5, characterized in that the arc-shaped reinforcing rib has a first opening provided on the opposite side of the first through hole.

7. The plastic member according to claim 5 or 6, characterized in that the radian of the arc-shaped reinforcing rib is α, and the temperature satisfies 90° ≤ α ≤ 270°.

8. The plastic member according to claim 7, characterized in that 135° ≤ α ≤ 225°.

9. The plastic member according to claim 7 or 8, characterized in that the radius of the arc-shaped reinforcing rib is R1, and the condition 0.5 mm ≤ R1 ≤ 5 mm is satisfied.

10. The plastic member according to claim 9, characterized in that 1 mm ≤ R1 ≤ 4 mm.

11. The plastic member according to any one of claims 7 to 10, characterized in that the radius of the arc-shaped reinforcing rib is R1, the radius of the first through hole is R2, and the condition 0.06 ≤ R1 / R2 ≤ 1.67 is satisfied.

12. The plastic member according to claim 11, characterized in that 0.2 ≤ R1 / R2 ≤ 1.

13. The plastic member according to any one of claims 5 to 12, characterized in that an ejector pin fitting region is provided on the main body adjacent to the first through hole, and the arc-shaped reinforcing rib is located between the ejector pin fitting region and the first through hole.

14. The plastic member according to claim 13, characterized in that the arc-shaped reinforcing rib extends along the circumferential direction of the ejector pin fitting region.

15. A second through-hole is provided on the main body for passing electrode terminals through, and the second through-hole penetrates the main body along the thickness direction. The plastic member according to any one of claims 1 to 14, characterized in that at least a portion of the first reinforcing member is located between the first through hole and the second through hole, or there are a plurality of first reinforcing members, and at least a portion of the plurality of first reinforcing members is located between the first through hole and the second through hole.

16. The main body has a first surface in the thickness direction, The plastic member according to any one of claims 1 to 15, wherein the plastic member further includes a protrusion on the first surface for contacting the electrode assembly, and the first through hole is located close to the protrusion.

17. The plastic member according to claim 16, characterized in that a second through-hole for passing electrode terminals is provided on the main body, and the first through-hole is located between the second through-hole and the protrusion.

18. The plastic member according to claim 16 or 17, characterized in that the first reinforcing member is provided on the first surface, and the protrusion height of the first reinforcing rib from the first surface is smaller than the protrusion height of the convex portion from the first surface.

19. A plastic member according to any one of claims 1 to 18, characterized in that the maximum length of the main body is a, the maximum width of the main body is b, and the conditions 150 mm ≤ a ≤ 500 mm and 20 mm ≤ b ≤ 150 mm are satisfied.

20. The plastic member according to claim 19, characterized in that it satisfies 150 mm ≤ a ≤ 350 mm and 20 mm ≤ b ≤ 100 mm.

21. The plastic member according to any one of claims 1 to 20, further comprising a second reinforcing member located in the end region and / or intermediate region in the longitudinal direction of the main body.

22. The plastic member according to claim 21, characterized in that the second reinforcing member comprises a first reinforcing rib extending in the longitudinal direction and a second reinforcing rib extending in the width direction.

23. The plastic member according to claim 22, characterized in that a second through-hole for passing electrode terminals is provided on the main body, and one end of the first reinforcing rib extends to the edge of the second through-hole.

24. End cover and, The electrode terminals attached to the end cover, An end cover assembly comprising a plastic member according to any one of claims 1 to 23, provided on the inner surface of the end cover, wherein the plastic member has a second through-hole on the main body for passing the electrode terminal through.

25. The end cover assembly according to claim 24, characterized in that the main body has a first surface opposite to the end cover, the first reinforcing member is convex to the first surface, and the protrusion height of the first reinforcing member from the first surface is less than or equal to the protrusion height of the electrode terminal from the first surface.

26. A battery cell comprising the end cover assembly described in claim 24 or 25.

27. A battery characterized by comprising the battery cell described in claim 26.

28. An electrical device characterized by comprising the battery described in claim 27.

Images