Cover plate, battery, and electronic appliance

Abstract

To provide a cover plate for a battery, in which the rust and corrosion at a position of a structural fragile part can be prevented, and abnormal voltage drop at the preservation of the battery under high temperature will not occur.SOLUTION: A cover plate 100 includes a non-structural fragile part 102 and a structural fragile part 101 that are formed integrally. The structure strength of the structural fragile part 101 is lower than that of the non-structural fragile part 102. The structural fragile part 101 is configured to be broken when the battery has its internal pressure released. At least a part of the structural fragile part 101 is covered with a phosphorus-containing nickel plating layer 103. By the cover plate 100 according to the present invention, at least a part of the outside of the structural fragile part 101 of the cover plate is plated with the phosphorus-containing nickel plating layer 103.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to the technical field of batteries, and in particular to cover plates, batteries and electronic devices. [Background technology]

[0002] 2. Description of the Related Art With the development of society and economy, an increasing number of electronic devices, such as new energy vehicles, communication base stations, and energy storage containers, use cylindrical batteries as energy storage and supply devices.

[0003] Some commercially available batteries have a structural weakness located in the cover plate that is used to induce the release of high-pressure gas in the event of a short circuit or thermal runaway in the battery.

[0004] However, since the structurally weak parts are in direct contact with the electrolyte inside the battery and the inside of the battery is at a constant temperature during operation, some gas or liquid may be generated from the electrolyte, causing rust and corrosion in the structurally weak parts, leading to abnormal conditions such as leakage, and resulting in an abnormal drop in battery voltage, i.e., a drop in battery voltage. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above problems, the present invention provides a cover plate, a battery, and an electronic device that can prevent rust and corrosion from occurring at the location of the structurally weak part by plating at least a part of the outside of the structurally weak part with a phosphorus-containing nickel plating layer, and that does not cause abnormal voltage drops when the battery is stored at high temperatures. [Means for solving the problem]

[0006] The present invention provides a cover plate for a battery, the cover plate including an integrally formed non-structurally weakened portion and a structurally weakened portion, the structurally weakened portion having a lower structural strength than the non-structurally weakened portion, the structurally weakened portion being configured to break when the battery releases internal pressure, and at least a portion of the structurally weakened portion being covered with a phosphorus-containing nickel plating layer.

[0007] In some embodiments, the cover plate includes a first surface and a second surface facing each other along its thickness direction, a portion of the structure of the first surface recessed outward toward the second surface to form a groove, a portion of the cover plate corresponding to the groove constitutes the structurally weakened portion, and the phosphorus-containing nickel plating layer covers the groove wall of the groove.

[0008] In some embodiments, the thickness of the structural weakness is less than the thickness of the non-structural weakness.

[0009] In some embodiments, the phosphorus-containing nickel plating layer covers at least a portion of the non-structural weakened portion.

[0010] In some embodiments, the phosphorus content in the phosphorus-containing nickel plating layer is 2 wt % to 20 wt %.

[0011] In some embodiments, the phosphorus content in the phosphorus-containing nickel plating layer is 4% by weight to 11% by weight.

[0012] In some embodiments, the phosphorus-containing nickel plating layer has a thickness of 2 μm to 6 μm.

[0013] In some embodiments, the phosphorus-containing nickel plating layer includes a first nickel plating layer covering a first surface of the cover plate, and a second nickel plating layer located on an outer surface of the first nickel plating layer remote from the cover plate, the second nickel plating layer including elemental phosphorus.

[0014] In some embodiments, the ratio of the thickness of the first nickel plating layer to the thickness of the second nickel plating layer is 0.5 to 1.5.

[0015] In some embodiments, the phosphorus-containing nickel plating layer has a thickness of 5 μm to 8 μm.

[0016] A second aspect of the present invention further provides a battery comprising: an electrode assembly; a housing including a receiving cavity, the housing having an attachment opening at one end along an axial direction, the electrode assembly being disposed in the receiving cavity, the housing being connected to a negative electrode of the electrode assembly; and the cover plate according to the first aspect of the present invention, the cover plate being disposed in the attachment opening and sealing the receiving cavity.

[0017] In some embodiments, a curled edge extending inward along a radial direction of the housing is disposed around the mounting opening, and a crimped portion protruding inward is further disposed on the housing adjacent to the mounting opening, the crimped portion and the curled edge are disposed at intervals along an axial direction of the housing and jointly hold the cover plate, the electrode assembly and the cover plate are respectively located on opposite sides of the crimped portion along the axial direction of the housing. The battery further includes a plastic member disposed around the periphery of the cover plate to separate the cover plate from the housing.

[0018] A third aspect of the present invention further provides an electronic device, comprising: a device body including a battery chamber; and the battery according to the second aspect of the present invention, the battery being disposed in the battery chamber and electrically connected to the device body. [Effects of the Invention]

[0019] The cover plate of the present invention has a phosphorus-containing nickel plating layer on at least a portion of the outer surface of the structurally weak portion, which significantly improves the corrosion resistance of the cover plate, thereby preventing rust and corrosion from occurring at the structurally weak portion during battery use, ensuring a reliable cover plate structure and extending its service life.Furthermore, when the battery is stored at high temperatures (e.g., 55°C, 70°C, etc.), no abnormal voltage drop (no voltage decay) occurs, ensuring reliable power supply performance. [Brief explanation of the drawings]

[0020] In order to more clearly describe the technical solutions in the embodiments of the present invention or related art, the drawings that need to be used in the description of the embodiments or prior art are briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. Those skilled in the art can obtain other drawings based on these drawings without creative efforts. [Figure 1] 1 is a schematic diagram illustrating an electronic device according to an embodiment of the present invention as a vehicle. [Figure 2] 1 is a structural schematic diagram of a battery according to some embodiments of the present invention. [Figure 3] 1 is a cross-sectional view of a battery according to some embodiments of the present invention. [Figure 4] FIG. 4 is an enlarged view of circled area A of FIG. 3 in accordance with some embodiments. [Figure 5] FIG. 4 is an enlarged view of circled portion A of FIG. 3 according to some other embodiments. [Figure 6] FIG. 4 is an enlarged view of circled portion A of FIG. 3 according to still other embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0021] In order to make the above-mentioned objectives, features and advantages of the embodiments of the present invention clearer and easier to understand, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the disclosed embodiments are only a part of the embodiments, not all of the embodiments of the present invention. All other embodiments obtained by ordinary skilled in the art based on the embodiments of the present invention without creative work shall fall within the scope of protection of the present invention.

[0022] With the development of society and economy, an increasing number of electronic devices employ batteries 600 as energy storage and supply devices.

[0023] The electronic device may be a vehicle 1000, a mobile phone, a portable device, a laptop computer, a boat, a spacecraft, an electric toy, an electric tool, or the like. The vehicle 1000 may be a gasoline-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extending vehicle, or the like. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, or the like. The electric toys may be stationary or mobile electric toys, such as game consoles, electric toy cars, electric toy boats, and electric toy airplanes. The electric tools may be metal cutting tools, grinding tools, assembly tools, railway tools, or the like, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, or the like. Alternatively, the electronic device may be an energy storage electronic device that stores energy and releases it to the outside. The embodiments of the present invention do not impose any particular limitations on the above electronic devices.

[0024] The electronic device may include a device body and a battery 600. The device body may include a battery compartment for the battery 600. The battery 600 is disposed in the battery compartment and electrically connected to the device body. For example, a power interface may be provided in the battery compartment, and the battery 600 may be connected to the power interface.

[0025] For convenience of explanation, the following embodiment will be described taking a vehicle 1000 as an example of an electronic device.

[0026] A battery 600 is disposed inside the vehicle 1000. The battery 600 may be disposed at the bottom, front, or rear of the vehicle body 1001. The battery 600 may be used to supply power to the vehicle 1000, for example, the battery 600 may be used as an operating power source for the vehicle 1000.

[0027] The vehicle 1000 may further include a controller and a motor. The controller is used to control the battery 600 to power the motor, for example, for starting the vehicle 1000, navigating, and requesting power for operations while traveling.

[0028] In embodiments of the present invention, the battery 600 may be a primary battery or a secondary battery. A primary battery refers to a battery that cannot be reused by recharging after discharge, while a secondary battery refers to a battery that can be recharged after discharge to activate the active material and continue to be used. The battery 600 may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal-oxide battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, or the like, but embodiments of the present invention are not limited thereto. The battery 600 according to embodiments of the present invention may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or a combination of both via current collection members.

[0029] Taking the battery 600 according to an embodiment of the present invention as an example of a lithium-ion battery, the lithium-ion battery may be a primary or secondary lithium battery, and includes a positive electrode sheet, a negative electrode sheet, a separator disposed between the positive and negative electrodes, and an electrolyte. Here, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material coated on the surface of the positive electrode current collector, and the negative electrode sheet includes a negative electrode current collector and a negative electrode active material coated on the surface of the negative electrode current collector.

[0030] The positive electrode active material used in the positive electrode sheet according to the embodiment of the present invention may be a lithium-containing composite oxide, specifically, LiMnO2, LiFeO2, LiMn2O4, Li2FeSiO4, LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2, LiNi5CO2Mn3O2, LizNi (1-x-y) CoxMyO2 (wherein 0.01≦x≦0.20, 0≦y≦0.20, 0.97≦z≦1.20, and M represents at least one element selected from the group consisting of Mn, V, Mg, Mo, Nb, and Al), LiFePO4, and LizCO (1-x) MxO2 (where 0≦x≦0.1, 0.97≦z≦1.20, and M represents at least one element selected from the group consisting of Mn, Ni, V, Mg, Mo, Nb, and Al), etc.

[0031] The negative electrode active material used in the negative electrode sheet according to an embodiment of the present invention may be a material capable of intercalating and deintercalating lithium. It may be, but is not limited to, a carbon material such as crystalline carbon (e.g., natural graphite, artificial graphite), amorphous carbon, carbon-coated graphite, or resin-coated graphite, or an oxide material such as indium oxide, silicon oxide, tin oxide, lithium titanate, zinc oxide, or lithium oxide. It may also be, but is not limited to, lithium metal or a metal material capable of forming an alloy with lithium. Examples of metal materials capable of forming an alloy with lithium include Cu, Sn, Si, Co, Mn, Fe, Sb, and Ag. Binary or ternary alloys containing these metals and lithium can also be used as the negative electrode active material. These negative electrode active materials may be used alone or in combination. From the viewpoint of high energy density, a carbon material such as graphite may be used in combination with a Si-based material such as Si, a Si alloy, or a Si oxide.

[0032] Furthermore, materials such as a binder and a conductive agent are usually added to the positive electrode active material, and the amount added can be adjusted within the range of 1% to 50% of the total amount of the positive electrode active material as needed.

[0033] The conductive agent is a reagent used to ensure good charge / discharge performance of the electrode. Examples of the conductive agent include graphite-based materials such as natural graphite and artificial graphite, carbon black-based materials such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black, conductive fibers such as carbon fiber and metal fiber, metal powders such as carbon fluoride powder, aluminum powder, and nickel powder, conductive whiskers such as zinc oxide and potassium titanate, and conductive metal oxides such as titanium dioxide or polyphenylene derivatives.

[0034] The binder is a component that facilitates binding between the active material and the conductive agent, and between the active material and the current collector, and can typically be selected from polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene-butadiene rubber, fluororubber, and various copolymers.

[0035] The current collector is a substrate that supports the electrode active material and is typically a metal foil with a thickness of 3 to 500 μm. There are no particular limitations on the material, as long as it has high electrical conductivity and does not undergo chemical reactions within the secondary battery system. For example, it may be a foil of nickel, titanium, aluminum, silver, stainless steel, carbon, or the like that has been subjected to a surface treatment. The surface of the current collector is typically smooth, but fine irregularities may be formed on the surface to improve adhesion between the positive electrode active material and the current collector. In addition to foil, the current collector may be in one or a combination of various shapes, such as film, mesh, porous material, foam, or nonwoven fabric.

[0036] An insulating film with high ion permeability and high mechanical strength is used as the separator between the positive and negative electrodes. The separator typically has a thickness of 9 μm to 18 μm, a pore size of 5 μm to 300 μm, an air permeability of 180 to 380 seconds / 100 mL, and a porosity of 30% to 50%. Examples of separators that can be used include sheets or nonwoven fabrics made of chemical-resistant, hydrophobic olefin polymers such as polypropylene, glass fiber, or polyethylene.

[0037] The electrolyte used in the lithium ion battery manufactured as described above generally contains a non-aqueous solvent, a lithium salt, and an additive.

[0038] The non-aqueous solvent is a non-aqueous solvent commonly used in the art, preferably an ester-based solvent, more preferably a carbonate-based solvent, wherein the carbonate-based solvent is preferably one or more of ethylene carbonate, dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), methyl ethyl carbonate (MEC), ethyl methyl carbonate (EMC), ethylene carbonate (EC), propylene carbonate (PC), and butylene carbonate (BC).

[0039] The lithium salt may be at least one of LiPF6, LiBF4, LiN(SO2F)2 (referred to as LiFSI), LiClO4, LiAsF6, LiB(C2O4)2 (referred to as LiBOB), LiBF2(C2O4) (referred to as LiDFOB), LiN(SO2RF)2, and LiN(SO2F)(SO2RF). Preferably, the content in the electrolyte is 5% to 20%.

[0040] The additive is preferably one or more of vinylene carbonate (VC), fluoroethylene carbonate (FEC), vinylethylene carbonate (VEC), ethylene sulfate (DTD), vinylene sulfate, 1,3-propane sultone (PS), allyl sultone, and 1,4-butane sultone. The typical amount of the additive in the electrolyte is 1% to 4%, for example 2%, of the electrolyte.

[0041] The manufacturing process of the battery in this embodiment is as follows.

[0042] (1) Preparation of positive electrode sheet: Positive electrode active material (e.g., LiNi 0.8 Co 0.1 Mn 0.1 O2, etc.), polyvinylidene fluoride as a binder, and acetylene black as a conductive agent are mixed in a mass ratio of 98:1:1, and an appropriate amount of N-methylpyrrolidone (NMP) solvent is added. The mixture is stirred in a vacuum mixer until the positive electrode slurry becomes uniform and transparent, producing a positive electrode slurry. The positive electrode slurry is uniformly applied to a 16 μm aluminum foil current collector, which is then air-dried at room temperature, transferred to an oven, and dried at 80°C to 120°C for 6 hours. The current collector is then cold-pressed and cut to produce a positive electrode sheet.

[0043] (2) Preparation of negative electrode sheet: The negative electrode active material, graphite, the conductive agent, acetylene black, the thickener, sodium carboxymethyl cellulose, and the binder, styrene butadiene rubber, were mixed in a mass ratio of 97:1:1:1, and deionized water was added. The mixture was then vacuum mixed to obtain a negative electrode slurry. The negative electrode slurry was then uniformly coated onto an 8 μm-thick copper foil current collector. After air-drying at room temperature, the mixture was transferred to an oven for drying, and then cold-pressed and cut to obtain a negative electrode sheet.

[0044] (3) Preparation of electrolyte: The organic solvent is a mixed solution of ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC). The volume ratio of EC, EMC, and DEC is 20:20:60. Lithium salt (LiPF6) thoroughly dried in an argon atmosphere glove box to a water content of less than 10 ppm is dissolved in the organic solvent and mixed uniformly to obtain an electrolyte solution with a LiPF6 concentration of 1 mol / L.

[0045] (4) Preparation of separator: A polypropylene separator with a thickness of 12 μm was selected.

[0046] (5) Battery construction: The positive electrode sheet, separator, and negative electrode sheet are wound up in this order, and a separator is placed between the positive electrode sheet and the negative electrode sheet to perform an insulating function.The wound bare battery cell is then placed in a shell and assembled to obtain a cylindrical battery.

[0047] In some embodiments, the battery 600 may be a battery pack. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery pack.

[0048] In some embodiments, the battery 600 may be a battery pack 1002. The battery pack 1002 includes a case and battery cells, and the battery cells or pack are housed within the case.

[0049] In some embodiments, the box may function as part of the chassis structure of the vehicle 1000. For example, a portion of the box may form at least a portion of the floor of the vehicle 1000, or a portion of the box may form at least a portion of the transverse and longitudinal beams of the vehicle 1000.

[0050] Some commercially available batteries have a structurally weak portion disposed in the cover plate, which is used to induce the release of high-pressure gas in the event of a short circuit or thermal runaway in the battery. However, the structurally weak portion is typically formed by processes such as etching or punching. During the processing of the structurally weak portion, the plating layer on the surface of the cover plate is easily damaged and peeled off, causing direct contact of the metal with the electrolyte, making the structurally weak portion susceptible to rust and corrosion. Furthermore, since the plating layer itself does not contain phosphorus elements or has an excessively low phosphorus content, it is prone to corrosion when in contact with the electrolyte for a long period of time, which can result in an abnormal drop in battery voltage.

[0051] In view of this, an embodiment of the present invention further provides a cover plate. As shown in Figures 2 to 6, the cover plate 100 of this embodiment can be used in a battery 600. The cover plate 100 is disposed at the negative electrode end of the battery 600 and can function as the negative electrode cover plate 100 of the battery 600.

[0052] Specifically, the cover plate 100 includes a non-structurally weak portion 102 and a structurally weak portion 101. The non-structurally weak portion 102 and the structurally weak portion 101 are integrally formed to ensure the overall strength and sealing of the cover plate 100 when the battery 600 is in a normal state. The structural strength of the structurally weak portion 101 is lower than that of the non-structurally weak portion 102. Here, structural strength refers to the mechanical properties of the cover plate 100 that allow it to resist breakage or excessive deformation. The structurally weak portion 101 is configured to break when the battery 600 releases internal pressure. For example, if the battery 600 experiences thermal runaway due to an internal short circuit or other cause, the high-pressure, high-heat released materials (including gas, electrolyte, etc.) can break through the cover plate 100 through the structurally weak portion 101 and complete their release, thereby avoiding dangerous situations such as explosions. At this time, the structurally weak portion 101 may burst or separate from the non-structurally weak portion 102.

[0053] For example, the structurally weakened portion 101 may be formed in any shape, such as a square, a circle, an annular, an arc, a U-shape, an H-shape, etc. The area in which the structurally weakened portion 101 itself is located and the area surrounded by the structurally weakened portion 101 may be a pressure relief area, and the non-structurally weakened portion 102 may at least partially surround the structurally weakened portion 101 in the circumferential direction. The non-structurally weakened portion 102 may provide attachment support to the structurally weakened portion 101.

[0054] At least a portion of the structurally weak portion 101 is covered with the phosphorus-containing nickel plating layer 103. For example, one surface of the structurally weak portion 101 facing the inside of the battery 600 may be covered with the phosphorus-containing nickel plating layer 103. Alternatively, one surface of the structurally weak portion 101 facing the inside of the battery 600 (i.e., the first surface referred to below) and one surface of the structurally weak portion 101 opposite to the inside of the battery 600 (i.e., the second surface referred to below) are both covered with the phosphorus-containing nickel plating layer 103. Furthermore, in an example where one surface of the structurally weak portion 101 facing the inside of the battery 600 is covered with the phosphorus-containing nickel plating layer 103, the entire surface of the structurally weak portion 101 facing the inside of the battery 600 may be covered with the phosphorus-containing nickel plating layer 130. Alternatively, only a portion of the surface may be covered with the phosphorus-containing nickel plating layer 103. For example, depending on factors such as process and operation, the portion covered with the phosphorus-containing nickel plating layer 103 may occupy 80%, 90%, 95%, etc. of the total area of ​​the structurally weak portion 101, but of course it may be more or less than this.

[0055] It can be seen that the structurally weak portion 101 can be formed by subjecting a portion of the structure of the cover plate 100 to at least one processing treatment, such as thinning, drawing, punching, cutting, or etching. Therefore, when processing the structurally weak portion 101, the nickel plating layer on the surface of the cover plate 100 is easily damaged (as shown in FIG. 4 ), making the structurally weak portion 101 prone to rust and corrosion. Furthermore, if the nickel plating layer itself does not contain phosphorus, its corrosion resistance is significantly reduced. In this embodiment, the structurally weak portion 101 is covered with a phosphorus-containing nickel plating layer 103. In the processing process of the cover plate 100, the structurally weak portion 101 is first processed and then plated with the phosphorus-containing nickel plating layer 103. This not only ensures that the phosphorus-containing nickel plating layer 103 is not damaged during processing, but also significantly improves the corrosion resistance of the cover plate 100 and enhances the reliability of the cover plate 100.

[0056] According to the cover plate 100 of the embodiment of the present invention, the phosphorus-containing nickel plating layer 103 is plated on at least a portion of the outer surface of the structurally weak portion 101. Therefore, in the processing of the cover plate 100, the phosphorus-containing nickel plating process can be performed after processing the structurally weak portion 101. The phosphorus-containing nickel plating layer 103 covers the structurally weak portion 101 and is not damaged during the processing of the structurally weak portion 101. Since the phosphorus-containing nickel plating layer 103 contains phosphorus, the corrosion resistance of the cover plate 100 is greatly improved, thereby preventing rust and corrosion from occurring at the structurally weak portion 101 during use of the battery 600. This ensures the structure of the cover plate 100 is reliable and its service life is extended. Furthermore, when the battery 600 is stored at high temperatures, no abnormal voltage drop occurs, and the power supply performance is reliable.

[0057] 4 and 5, in some embodiments, the cover plate 100 may include a first surface 100a and a second surface 100b. The first surface 100a and the second surface 100b face each other along the thickness direction of the cover plate 100 (i.e., the axial direction of the battery 600). For example, the first surface 100a may be the surface of one side of the cover plate 100 facing the inside of the battery 600, i.e., the inner surface, and the second surface 100b may be the surface of one side of the cover plate 100 facing the outside of the battery 600, i.e., the outer surface.

[0058] A portion of the structure of the first surface 100a is recessed toward the second surface 100b, forming a groove, and the portion of the cover plate 100 corresponding to the groove forms a structurally weakened portion 101. That is, the structurally weakened portion 101 surrounds the periphery and bottom of the groove, with a portion of one surface of the structurally weakened portion 101 functioning as the sidewall of the groove and a portion of another surface functioning as the bottom wall of the groove. For example, as shown in FIG. 6, both the first surface 100a and the second surface 100b may be recessed outward at the same time. Both the inner and outer surfaces of the structurally weakened portion 101 are stretched, thereby reducing the structural strength of the structurally weakened portion 101. Alternatively, as shown in FIGS. 4 and 5, only the first surface 100a may be punched and etched. In this case, only the first surface 100a is recessed outward, thereby similarly reducing the structural strength of the structurally weakened portion 101. The cross section of the recessed groove formed outward may be trapezoidal, V-shaped, or U-shaped. The phosphorus-containing nickel plating layer 103 covers the groove walls of the structurally weak portion 101. The groove walls include the side walls and bottom wall. As such, the structure of the structurally weak portion 101 is relatively simple and easy to realize.

[0059] In addition to the above method, the material of the structurally weak portion 101 and the material of the non-structurally weak portion 102 may be different, and the strength of the material of the structurally weak portion 101 may be lower than the strength of the material of the non-structurally weak portion 102.

[0060] It can be understood that when the cover plate is punched, the nickel plating layers on both the first and second surfaces of the cover plate will be damaged to some extent, making both the first and second surfaces susceptible to rust and corrosion. Therefore, the cover plate 100 of this embodiment can have a phosphorus-containing nickel plating layer 103 disposed on both the first surface 100a and the second surface 100b. In other words, the phosphorus-containing nickel plating layer 103 covers both opposing surfaces of the structurally weak portion 101, preventing rust and corrosion problems from occurring at the position of the structurally weak portion 101 of the cover plate 100.

[0061] In some embodiments, referring to FIGS. 4 and 5 , the thickness of the structurally weakened portion 101 is smaller than the thickness of the non-structurally weakened portion 102. Here, the "thickness" refers to the distance from any position on the groove wall to the second surface of the cover plate 100. Furthermore, here, the "thickness" of the structurally weakened portion 101 refers to the minimum thickness of the structurally weakened portion 101. The "thickness" of the non-structurally weakened portion 102 refers to the minimum thickness of the non-structurally weakened portion 102. For example, a groove is formed in a portion of the structure of the cover plate 100 by a process such as punching and etching, and the bottom wall portion of the groove serves as the structurally weakened portion 101. In this case, the structurally weakened portion 101 has a thinner thickness and lower structural strength than the non-structurally weakened portion 102 because a portion of the structure has been removed. If thermal runaway occurs in the battery 600, high-temperature and high-pressure gas can be guided from the structurally weakened portion 101 to break through the cover plate 100, thereby achieving release. As such, the structure of the structurally weakened portion 101 is relatively simple and easy to implement.

[0062] In some embodiments, the phosphorus-containing nickel plating layer 103 covers at least a portion of the non-structural weak portion 102. For example, the phosphorus-containing nickel plating layer 103 may cover a portion of the non-structural weak portion 102. Alternatively, the phosphorus-containing nickel plating layer 103 may completely cover the non-structural weak portion 102. It is preferable that the phosphorus-containing nickel plating layer 103 completely covers the non-structural weak portion 102. In this case, the phosphorus-containing nickel plating layer 103 can simultaneously cover the structural weak portion 101 and the non-structural weak portion 102. The phosphorus-containing nickel plating layer 103 covering the structural weak portion 101 and the non-structural weak portion 102 can be formed simultaneously in one process, so the process of forming the phosphorus-containing nickel plating layer 103 does not become more complicated. Furthermore, rust and corrosion can be prevented from occurring in the non-structural weak portion 102, thereby improving the reliability of the entire cover plate 100.

[0063] In some embodiments, the phosphorus content in the phosphorus-containing nickel plating layer 103 is 2% to 20% by weight. That is, the phosphorus content in the phosphorus-containing nickel plating layer 103 is 2% to 20% by mass, for example, the phosphorus content in the phosphorus-containing nickel plating layer 103 is 2%, 4%, 6%, 8%, 10%, 12%, 14%, 15%, 16%, 18%, or 20%. In this way, a phosphorus content that is too low, for example, less than 2% by weight, can prevent the corrosion resistance of the phosphorus-containing nickel plating layer 103 from decreasing. Conversely, a phosphorus content that is too high, for example, more than 20% by weight, can prevent the hardness and corrosion resistance of the phosphorus-containing nickel plating layer 103 from decreasing. Naturally, the present invention is not limited thereto, and the phosphorus content in the phosphorus-containing nickel plating layer 103 can be appropriately selected within the above range according to actual needs.

[0064] Optionally, the phosphorus content in the phosphorus-containing nickel plating layer 103 is 4% to 20% by weight. For example, the phosphorus content in the phosphorus-containing nickel plating layer 103 may be 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, or 20% by mass. Naturally, the present invention is not limited thereto, and the phosphorus content in the phosphorus-containing nickel plating layer 103 can be appropriately selected within the above range according to actual needs.

[0065] Furthermore, the phosphorus content in the phosphorus-containing nickel plating layer 103 is 4% by weight to 15% by weight. For example, the phosphorus content in the phosphorus-containing nickel plating layer 103 may be 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, or 15% by mass. Naturally, the present invention is not limited thereto, and the phosphorus content in the phosphorus-containing nickel plating layer 103 can be appropriately selected within the above range according to actual needs.

[0066] Furthermore, the phosphorus content in the phosphorus-containing nickel plating layer 103 is 4 wt% to 11 wt%. By setting the phosphorus content in the phosphorus-containing nickel plating layer 103 to the lower limit of 4 wt%, corrosion during high-temperature storage can be more effectively prevented. For example, the phosphorus content in the phosphorus-containing nickel plating layer 103 may be 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5, 9%, 9.5%, 10%, 10.5%, or 11% by mass. Naturally, the present invention is not limited thereto, and the phosphorus content in the phosphorus-containing nickel plating layer 103 can be appropriately selected within the above range according to actual needs.

[0067] In some embodiments, the thickness of the phosphorus-containing nickel plating layer 103 is 2 μm to 6 μm. For example, the thickness of the phosphorus-containing nickel plating layer 103 may be 2 μm, 3 μm, 4 μm, 5 μm, or 6 μm. Naturally, the present invention is not limited to this, and the thickness of the phosphorus-containing nickel plating layer 103 can be appropriately selected within the above range according to actual needs. In this way, it is possible to avoid a decrease in the adhesion effect of the phosphorus-containing nickel plating layer 103, which occurs when the phosphorus-containing nickel plating layer 103 is too thick, for example, when it exceeds 6 μm, and thus a tendency for powder shedding to occur during a bending test of the cover plate 100. In addition, it is possible to avoid a decrease in the corrosion prevention effect of the phosphorus-containing nickel plating layer 103, which occurs when the phosphorus-containing nickel plating layer 103 is too thin, for example, when it is less than 2 μm. Note that the phosphorus-containing nickel plating layer 103 in this embodiment is a single layer.

[0068] 5, in some other embodiments, the phosphorus-containing nickel plating layer 103 may include a first nickel plating layer 1031 and a second nickel plating layer 1032. Specifically, the first nickel plating layer 1031 covers the first surface of the cover plate 100, and the second nickel plating layer 1032 is located outside the first nickel plating layer 1031, that is, the first nickel plating layer 1031 and the second nickel plating layer 1032 may be arranged in a stacked manner.

[0069] The second nickel plating layer 1032 covers at least the portion of the first nickel plating layer 1031 that faces the structurally weak portion 101, and the second nickel plating layer 1032 contains elemental phosphorus. That is, the second nickel plating layer 1032 may completely cover the first nickel plating layer 1031, or may cover only the portion of the first nickel plating layer 1031 that faces the structurally weak portion 101. The elemental phosphorus of the phosphorus-containing nickel plating layer 103 may be present only in the second nickel plating layer 1032, or both the first nickel plating layer 1031 and the second nickel plating layer 1032 may contain elemental phosphorus. In this way, the second nickel plating layer 1032 and the first nickel plating layer 1031 improve the corrosion resistance and rust prevention properties of the cover plate 100, thereby more effectively protecting the cover plate 100.

[0070] When the phosphorus-containing nickel plating layer 103 of this embodiment is disposed on the second surface 100b of the cover plate 100, it is understood that the method of disposing the first nickel plating layer 1031 and the second nickel plating layer 1032 on the second surface 100b may be the same as the method of disposing them on the first surface 100a and the formation process. In this way, when the battery 600 is exposed to air, rust can be prevented from occurring on the second surface 100b of the cover plate 100, thereby better protecting the cover plate 100. Since the purpose of rust prevention can be achieved simply by facing the outside of the housing, it is preferable that the second surface 100b include only the first nickel plating layer 1031 or the second nickel plating layer 1032. However, if both the first nickel plating layer 1031 and the second nickel plating layer 1032 are included, the rust prevention effect is further improved.

[0071] Optionally, the first nickel plating layer 1031 may be formed in a pre-nickel plating process performed on the cover plate 100, and the second nickel plating layer 1032 may be formed in a post-nickel plating process performed on the cover plate 100. Here, pre-nickel plating refers to a process in which the nickel plating process is performed before the process of processing the structurally weak portion 101. Post-nickel plating refers to a process in which the nickel plating process is performed after the process of processing the structurally weak portion 101. In this way, even if the first nickel plating layer 1031 is damaged in the process of processing the structurally weak portion 101, the phosphorus-containing second nickel plating layer 1032 will still cover the damaged position of the first nickel plating layer 1031, i.e., the structurally weak portion 101, in the subsequent post-nickel plating process, thereby improving the rust prevention and corrosion resistance of the cover plate 100.

[0072] Naturally, the present invention is not limited to this, and pre-nickel plating may be performed after the processing step of the structurally weak portion 101 and before the post-nickel plating step.

[0073] In some embodiments, the phosphorus-containing nickel plating layer 103 can be formed using at least one nickel plating process, such as electroplating or chemical plating. For example, if the phosphorus-containing nickel plating layer 103 is a single layer, the phosphorus-containing nickel plating layer 103 can be formed using either an electroplating or chemical plating process. If the phosphorus-containing nickel plating layer 103 is a two-layer or multi-layer structure, i.e., if the phosphorus-containing nickel plating layer 103 includes a first nickel plating layer 1031 and a second nickel plating layer 1032, the first nickel plating layer 1031 and the second nickel plating layer 1032 can both be formed using an electroplating process, or both can be formed using a chemical nickel plating process, or one can be formed using an electroplating process and the other can be formed using a chemical nickel plating process. As such, there are multiple methods for nickel plating the phosphorus-containing nickel plating layer 103, and an appropriate method can be selected according to actual needs.

[0074] In some embodiments, the ratio of the thickness of the first nickel plating layer 1031 to the thickness of the second nickel plating layer 1032 is 0.5 to 1.5. For example, the ratio of the thickness of the first nickel plating layer 1031 to the thickness of the second nickel plating layer 1032 is 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, or 1.5. Naturally, the present invention is not limited to this, and the ratio of the thickness of the first nickel plating layer 1031 to the thickness of the second nickel plating layer 1032 can be appropriately selected within the above range depending on actual needs. In this way, the ratio of the thickness of the second nickel plating layer 1032 containing phosphorus to the first nickel plating layer 1031 can be optimized, thereby ensuring the corrosion resistance of the cover plate 100.

[0075] In some embodiments, when the phosphorus-containing nickel plating layer 103 is formed by a pre-nickel plating process and a post-nickel plating process, the thickness of the phosphorus-containing nickel plating layer 103 is 5 μm to 8 μm. For example, the thickness of the phosphorus-containing nickel plating layer 103 may be 5 μm, 6 μm, 7 μm, or 8 μm. In this way, if the phosphorus-containing nickel plating layer 103 is too thick, for example, if it exceeds 6 μm, powder shedding is likely to occur, and the adhesion effect of the phosphorus-containing nickel plating layer 103 is reduced. Also, if the phosphorus-containing nickel plating layer 103 is too thin, for example, if it is less than 5 μm, the corrosion prevention effect of the phosphorus-containing nickel plating layer 103 is reduced. Note that the thickness of the phosphorus-containing nickel plating layer 103 in this embodiment is the total thickness of the first nickel plating layer 1031 and the second nickel plating layer 1032.

[0076] When the phosphorus-containing nickel plating layer 103 has a two-layer or multi-layer structure, increasing the ratio of the phosphorus-containing portion in the phosphorus-containing nickel plating layer 103 contributes to improving the corrosion resistance of the entire cover plate 100. Therefore, in this embodiment, the thickness of the second nickel plating layer 1032 can be set to be greater than the thickness of the first nickel plating layer 1031. This increases the ratio of the phosphorus-containing portion in the phosphorus-containing nickel plating layer 103, thereby improving the rust prevention and corrosion resistance of the entire cover plate 100 and ensuring the effectiveness and reliability of the phosphorus-containing nickel plating layer 103.

[0077] In some embodiments, the cover plate 100 may be made of cold-rolled steel, such as general-purpose cold-rolled carbon steel sheet and strip (SPCC), which provides the cover plate 100 with favorable forming properties.

[0078] In some other alternative embodiments, the cover plate 100 may be constructed from at least one metallic material such as aluminum, steel, nickel, and the like.

[0079] A battery 600 according to one embodiment of the present invention will now be described.

[0080] 2 and 3, the battery 600 of this embodiment is preferably a cylindrical battery 600. Because a cylindrical battery is vertically arranged and the cover plate 100 is located at the bottom, the cover plate 100 is in contact with the electrolyte for a long period of time and is prone to corrosion. The battery 600 may include an electrode assembly 300, a housing 200, and the cover plate 100 of the above embodiment.

[0081] Specifically, the electrode assembly 300 includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet, the separator, and the negative electrode sheet are stacked in this order and wound to form the electrode assembly 300. That is, the electrode assembly 300 is a wound cell. After being wound, the electrode assembly 300 may have a cylindrical, flat, polygonal prism, or other shape.

[0082] The housing 200, together with the cover plate 100, is a member that can accommodate the electrode assembly 300. The housing 200 may be made of steel or other materials. The housing 200 is cylindrical and defines a receiving cavity 201. The housing 200 has an attachment opening at one end along its axis. The electrode assembly 300 is disposed within the receiving cavity 201. The housing 200 is connected to the negative electrode of the electrode assembly 300, i.e., the housing 200 is negatively charged. The cover plate 100 is disposed within the attachment opening and seals the receiving cavity 201. The other end along its axis can function as an upper plate. The battery 600 may further include an electrode post that penetrates the upper plate and is connected to the positive electrode of the electrode assembly 300. Naturally, the electrode post and the housing 200 are insulated to avoid short-circuiting the battery 600. In some embodiments, one side of the housing 200 facing the electrode assembly 300 includes a phosphorus-containing nickel plating layer 103. Because this side comes into contact with the electrolyte, the phosphorus-containing nickel plating layer 103 can prevent the inside of the housing 200 from easily corroding.

[0083] Here, since the cover plate 100 is disposed at the negative electrode end of the battery 600, when the battery 600 is disposed vertically in the overall arrangement of the new energy vehicle and the cover plate 100 is disposed downward, the structurally weak part 101 is disposed on the cover plate 100, so that when thermal runaway occurs in the battery 600, the high-temperature and high-pressure emitted material inside will be discharged to the outside after breaking through the structurally weak part 101 from the bottom of the battery 600, avoiding upward discharge into the driver's cab, thereby achieving good guidance of the emitted material.

[0084] In addition, the phosphorus-containing nickel plating layer 103 on the outside of the structurally weak portion 101 of the cover plate 100 can protect the structure of the structurally weak portion 101 from damage due to corrosion, thereby ensuring that the structurally weak portion 101 can effectively guide the directional discharge of emitted matter in a timely manner when a short circuit occurs in the battery 600.

[0085] According to the battery 600 of the embodiment of the present invention, by disposing the cover plate 100 of the above embodiment, it is possible to prevent rust and corrosion from occurring on the cover plate 100, thereby improving the reliability of the cover plate 100, and avoiding abnormal voltage drops in the battery 600 when stored at high temperatures, thereby ensuring the power supply performance of the battery 600.

[0086] In some embodiments, the cover plate 100 is insulated from the housing 200 and spaced apart from the electrode assembly 300. That is, when the housing 200 is negatively charged, the cover plate 100 is not charged. In this way, even when the cover plate 100 is not charged, the phosphorus-containing nickel plating layer 103 on the outside of the cover plate 100 can preferably prevent the cover plate 100 from corroding, thereby ensuring the reliability of the battery 600.

[0087] In some embodiments, a curled edge 202 is disposed around the mounting opening. The curled edge 202 extends radially inward along the housing 200. An inwardly protruding crimping portion 203 is further disposed adjacent to the mounting opening of the housing 200. For example, the crimping portion 203 may be separately formed on the inner wall of the housing 200, or may be formed by bending a portion of the structure of the housing 200 inward. The crimping portion 203 and the curled edge 202 are spaced apart along the axial direction of the housing 200. The crimping portion 203 and the curled edge 202 can cooperate to clamp the cover plate 100. The electrode assembly 300 and the cover plate 100 are respectively located on opposite sides of the crimping portion 203 along the axial direction of the housing 200. In this case, the curled edge 202 and the crimping portion 203 collectively provide positioning support for the cover plate 100, ensuring the mounting stability of the cover plate 100. The crimping portion 203 can also separate the cover plate 100 from the electrode assembly 300, thereby preventing the cover plate 100 from connecting with the negative electrode of the electrode assembly 300, thereby preventing the cover plate 100 from being charged; furthermore, the overall structure is simple and easy to implement.

[0088] In some embodiments, the battery 600 may further include a plastic member 500. The plastic member 500 surrounds the periphery of the cover plate 100 and separates the cover plate 100 from the housing 200. For example, the plastic member 500 may be a sealing ring that surrounds the periphery of the cover plate 100. In this case, the plastic member 500 may cover parts of the sides and the first and second surfaces of the cover plate 100, thereby more effectively separating the cover plate 100 from the housing 200.

[0089] In some embodiments, the crimping portion 203 is formed by recessing the peripheral wall of the housing 200 inward. That is, the crimping portion 203 in this embodiment is not separately formed on the inner wall of the housing 200, but is formed by bending part of the structure of the housing 200 inward. At this time, a roller groove structure is formed on the outer wall of the housing 200. This can further simplify the structure of the housing 200, making processing easier and facilitating the assembly of the entire battery 600.

[0090] In some embodiments, the battery 600 may further include a negative current collector 400. The negative current collector 400 is disposed on one side of the crimping portion 203 facing the electrode assembly 300. The negative current collector 400 includes a plate body and a connection portion. The plate body may be welded to the negative tab of the electrode assembly 300, and the connection portion is located around the plate body, connecting the connection portion and the housing 200 to negatively charge the housing 200. The negative current collector 400 may be disposed at a distance from the crimping portion 203, which allows for better current conduction. Furthermore, the negative current collector 400 may serve to separate the electrode assembly 300 and the cover plate 100. The housing 200 is made of steel. The housing 200 and the cover plate 100 are made of the same material. This ensures that the force applied when the cover plate and the housing 200 are connected is more uniform and a better connection is achieved.

[0091] In addition, by arranging the battery 600 of the above embodiment in the electronic device of this embodiment, it is possible to stably and reliably supply power to the device body, ensure normal power consumption of the electronic device, and contribute to improving the user experience.

[0092] The following are steps for plating the phosphorus-containing nickel plating layer 103 on the cover plate 100 according to some embodiments.

[0093] S101, Cover Plate 100 Surface Pretreatment: In order to obtain a uniform phosphorus-containing nickel plating layer 103 with low porosity and excellent bonding strength on the surface of the cover plate 100, before plating the surface of the cover plate 100, the surface of the cover plate 100 is pretreated in the following order: removing rust by sandblasting, degreasing by boiling in alkali, washing with tap water, activating the metal surface by pickling and rust removal, washing with tap water, and washing with warm water.

[0094] S102, Plating: After the pretreatment is completed, the cover plate 100 is plated. The main components of the Ni-P plating solution are nickel sulfate, sodium hypophosphite, a complexing agent, a buffer, a brightener, etc. The plating solution is heated to 85°C, the pH value is adjusted to 4.5 to 6, the deposition rate is about 10 tan / h, and the treatment time is set according to the thickness of the cover plate 100.

[0095] S103, Post-plating treatment: The plated workpiece, i.e., cover plate 100, is rinsed with water and then placed in a sealing solution for a sealing treatment to improve the corrosion resistance of the phosphorus-containing nickel plating layer 103. After sealing, the cover plate 100 is immediately rinsed thoroughly and blown dry.

[0096] Table 1 is a comparison table of test results for cover plates of an example and a comparative example in which the phosphorus-containing nickel plating layer 103 is formed on the cover plate 100 using the pre-nickel plating and post-nickel plating processes of the present invention.

[0097] [Table 1]

[0098] Here, the surface of the cover plate of Comparative Example 1 was treated only by a pre-nickel plating process, and the nickel plating layer formed did not contain phosphorus. The surface of the cover plate of Comparative Example 2 was treated by a pre-nickel plating process and a post-nickel plating process, respectively, where the pre-nickel plating layer formed in the pre-nickel plating process did not contain phosphorus, and the post-nickel plating process was an electrolytic nickel plating process, and the post-nickel plating layer formed did not contain phosphorus. The surface of the cover plate of Comparative Example 3 was treated by a pre-nickel plating process and a post-nickel plating process, respectively, where the pre-nickel plating layer formed in the pre-nickel plating process did not contain phosphorus, and the post-nickel plating process was a chemical nickel plating process, and the post-nickel plating layer formed did not contain phosphorus. All of Examples 1 to 4 adopted the technical solution of the present invention, where the first nickel plating layer 1031 formed in the pre-nickel plating process did not contain phosphorus, and the second nickel plating layer 1032 formed in the post-nickel plating process contained phosphorus. Here, the post-nickel plating process in Examples 1 and 2 to 5 was chemical plating, and the post-nickel plating process in Example 2 was electrolytic plating.

[0099] In the table, electroplating refers to a process of plating a nickel layer on the surface of the cover plate (i.e., SPCC cover plate), and chemical plating refers to a process of depositing nickel ions in a solution on the surface of the cover plate (i.e., SPCC cover plate) through chemical reduction to form a nickel layer.

[0100] As can be seen from the bending tests and EDS analysis of the cover plates 100 of Comparative Examples 1 to 3 and Examples 1 to 5, the cover plate 100 of the present embodiment employs pre-nickel plating and post-nickel plating processes, resulting in a nickel plating layer containing phosphorus, and the battery 600 does not experience an abnormal voltage drop when stored at a relatively high temperature. Furthermore, to satisfy the requirements of the high-temperature storage test and further improve the bending test, if the overall thickness of the nickel plating layer is 5 to 8 μm, the reduction in powder shedding due to an excessively thick nickel plating layer can be avoided, and the phosphorus-containing nickel plating layer 103 has a better adhesion effect to the cover plate 100. Thus, the cover plate 100 of the present embodiment contributes to the overall power supply performance of the battery 600.

[0101] The principle of the high-temperature storage test is as follows.

[0102] For batteries using ternary materials (e.g., lithium-nickel-cobalt-manganese composite metal oxide), the battery was charged to 4.2 V at a constant current of 0.5 C, left at 70°C for 20 days, and then the battery voltage was measured. A voltage of less than 4.0 V was considered to have an abnormal voltage drop, and a voltage of 4.0 V or more was considered to have no abnormal voltage drop.

[0103] For batteries using lithium iron phosphate material, the battery was charged to 3.6V at a constant current of 0.5C, left at 70°C for 20 days, and then the battery voltage was measured. A voltage of less than 3.4V was considered to have an abnormal voltage drop, and a voltage of 3.4V or more was considered to have no abnormal voltage drop.

[0104] The specific testing principle of the bending test is as follows: the cover plate 100 was bent around a 10 mm diameter cylindrical rod at a bending angle of 45° to simulate the deformation state of the cover plate 100 during the later stages of cell cycling and gas generation. The adhesion of the nickel plating layer was evaluated by comparing the metal inclusion levels before and after bending to determine whether the nickel layer showed powder shedding or remained in a normal state.

[0105] Table 2 is a comparison table of test results for the cover plates of the Example and Comparative Example, in which the post-nickel plating process of the present invention is employed to form the phosphorus-containing nickel plating layer 103 on the cover plate 100.

[0106] [Table 2]

[0107] Here, the surface of the cover plate of Comparative Example 4 was not nickel-plated. All of Examples 6 to 10 are technical proposals that employ the post-nickel plating process of the present invention to form a phosphorus-containing nickel plating layer on the cover plate 100, and the post-nickel plating process is chemical plating.

[0108] First, a high-temperature storage test was conducted on the battery 600. As can be seen from Table 2, when the battery 600 was stored at high temperatures, the battery 600 did not experience an abnormal voltage drop. Furthermore, a bending test was conducted on the cover plate of the battery 600. It was found that when the total thickness of the nickel plating layer is 2 to 6 μm, it is possible to avoid a reduction in powder shedding due to an excessively thick nickel plating layer, and the phosphorus-containing nickel plating layer 103 has a better adhesion effect to the cover plate 100. As such, the cover plate 100 of the embodiment of the present invention contributes to the overall power supply performance of the battery 600.

[0109] Table 3 is a comparison table of test results for an embodiment in which the post-nickel plating process of the present invention is employed to form the phosphorus-containing nickel plating layer 103 on the cover plate 100.

[0110] [Table 3]

[0111] Here, Examples 11 to 15 are all technical proposals that employ the post-nickel plating process of the present invention to form a phosphorus-containing nickel plating layer 103 on the cover plate 100, and the post-nickel plating process is chemical plating, with a phosphorus content of 2% to 20% by weight.

[0112] First, a high-temperature storage test was conducted on the battery 600. As can be seen from Table 3, the cover plates 100 of Examples 11 to 15 were not corroded, and the battery 600 did not experience an abnormal voltage drop. Furthermore, a bending test was conducted on the cover plate of the battery 600. It was found that the phosphorus-containing nickel plating layer 103 had a better adhesion effect to the cover plate 100.

[0113] In the above table, the corrosion resistance test results of the cover plate 100 of each example were obtained by subjecting the cover plate 100 to a salt spray environmental rust test in a laboratory environment and leaving the cover plate 100 in the salt spray environment for two hours. From this, it can be seen that the cover plate 100 of the embodiment of the present invention contains a certain percentage (for example, 2 wt% to 20 wt%, preferably 4 wt% to 11 wt%) of phosphorus in the nickel plating layer, thereby preventing traces of rust or corrosion from remaining on the surface of the cover plate 100, significantly improving the corrosion resistance of the cover plate 100 and ensuring the reliability of the battery 600.

[0114] It should be noted that, although an embodiment represented by "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., referred to in this specification may include a particular feature, structure, or characteristic, it does not mean that all embodiments include the particular feature, structure, or characteristic. Moreover, such terms do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of a person skilled in the art to realize such feature, structure, or characteristic by combining embodiments, whether explicitly described or not explicitly described.

[0115] In general, terms should be understood, at least in part, based on the contextual usage in which they are used. For example, as used herein, the term "one or more" can be used in the singular sense to describe any feature, structure, or characteristic, or in the plural sense to describe a combination of features, structures, or characteristics, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the," can be interpreted as referring to either the singular or the plural, depending, at least in part, on the context.

[0116] It should be readily understood that the terms "on," "more than," and "on" in this disclosure should be interpreted in the broadest sense, and that "on" not only means "directly on top of something," but also includes the meaning "on top of something" with an intervening feature or layer, and that "above" or "on" not only means "above something" or "on top of," but can also include the meaning "on top of something" or "on top of" without an intervening feature or layer (i.e., directly on top of something).

[0117] Also, for convenience of explanation, spatially relative terms, such as "below," "lower," "below," "above," "upper," etc., may be used herein to describe the relationship of one element or feature to another element or feature as shown in the figures. The spatially relative terms are intended to encompass various orientations of the device during use or operation in addition to the orientation shown in the figures. The device may be otherwise oriented (rotated 90 degrees or at another orientation) and the spatially relative terms used herein may be interpreted accordingly.

[0118] Finally, it should be noted that the above embodiments are used solely to describe the technical solutions of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can further modify the technical solutions described in the above embodiments, or equivalently replace part or all of the technical features thereof. It should be understood that these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention. [Industrial Applicability]

[0119] The cover plate, battery and electronic device of the present invention can be applied in the field of battery technology. [Explanation of symbols]

[0120] 100: Cover plate 100a: First surface 100b: 2nd surface 101: Structural weakness 102: Non-structural weak parts 103: Phosphorus-containing nickel plating layer 1031: First nickel plating layer 1032: Second nickel plating layer 200: Housing 201: Containment cavity 202: Curl edge 203: Crimping section 300: Electrode assembly 400: Negative electrode current collector plate 500: Plastic materials 600:Battery 1000:Vehicle 1001: Body 1002: Battery pack

Claims

1. 1. A cover plate for use in a battery, comprising: the battery includes an integrally formed non-structurally weak portion and a structurally weak portion, the structural strength of the structurally weak portion being lower than the structural strength of the non-structurally weak portion, the structurally weak portion being configured to be broken when the battery releases internal pressure, and at least a portion of the structurally weak portion being covered with a phosphorus-containing nickel plating layer; A cover plate characterized by:

2. the cover plate includes a first surface and a second surface facing each other along a thickness direction thereof, a portion of the structure of the first surface is recessed toward the second surface to form a recessed groove, and a portion of the cover plate corresponding to the recessed groove constitutes the structurally weakened portion; The phosphorus-containing nickel plating layer covers the groove wall of the groove.

2. A cover plate according to claim 1, characterized in that it is

3. the thickness of the structurally weakened portion is less than the thickness of the non-structurally weakened portion; The cover plate is made of steel.

3. A cover plate according to claim 2, characterized in that it is

4. the phosphorus-containing nickel plating layer covers at least a portion of the non-structurally weak portion; 3. A cover plate according to claim 2, characterized in that it is

5. The phosphorus content in the phosphorus-containing nickel plating layer is 2% by weight to 20% by weight.

2. A cover plate according to claim 1, characterized in that it is

6. The phosphorus content in the phosphorus-containing nickel plating layer is 4% by weight to 11% by weight.

6. A cover plate according to claim 5, characterized in that it is

7. The thickness of the phosphorus-containing nickel plating layer is 2 μm to 6 μm.

2. A cover plate according to claim 1, characterized in that it is

8. The phosphorus-containing nickel plating layer is a first nickel plating layer covering a first surface of the cover plate; a second nickel plating layer located on an outer surface of the first nickel plating layer away from the cover plate and containing phosphorus; 10. The cover plate of claim 1, comprising:

9. the ratio of the thickness of the first nickel plating layer to the thickness of the second nickel plating layer is 0.5 to 1.5; 9. A cover plate according to claim 8, characterized in that it is

10. The thickness of the phosphorus-containing nickel plating layer is 5 μm to 8 μm.

9. A cover plate according to claim 8, characterized in that it is

11. an electrode assembly; a housing including a receiving cavity and having a mounting opening at one end along an axial direction, the electrode assembly being disposed in the receiving cavity, the housing having a side facing the electrode assembly including a phosphorus-containing nickel plating layer; a cover plate according to any one of claims 1 to 10, disposed in the mounting opening and sealing the receiving cavity; A battery comprising:

12. a curled edge portion extending inward along a radial direction of the housing is disposed around the mounting opening; a crimping portion protruding inward is further disposed adjacent to the mounting opening of the housing, the crimping portion and the curled edge portion being spaced apart along the axial direction of the housing and jointly holding the cover plate; the electrode assembly and the cover plate are respectively positioned on opposite sides of the crimping portion along the axial direction of the housing; the battery further includes a plastic member disposed around the periphery of the cover plate to insulate and seal the cover plate from the housing; The housing is made of steel, and the battery is a cylindrical battery.

12. The battery of claim 11 .

13. a device body including a battery compartment; 12. The battery according to claim 11, wherein the battery is disposed in the battery chamber and electrically connected to the device body; Including, An electronic device characterized by:

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