Winding button cell and electroacoustic device

Abstract

In order to solve the problem that in the prior art, a magnetic field generated by a winding button battery interferes with electric appliances such as a portable electroacoustic device, the invention provides a winding button battery and an electroacoustic device, the winding button battery is composed of a shell, a cover body and a winding core, the shell and the cover body are assembled to form a closed cavity, and the winding core is arranged in the closed cavity. The roll core is arranged in the closed cavity; at least part of the cover body and / or at least part of the shell are / is set as a corrosion-resistant magnetic shielding part; the corrosion-resistant magnetic shielding part is made of a first metal material which is a metal material with the relative magnetic conductivity larger than or equal to 50 and the chromium element larger than 10 wt%. According to the winding button cell provided by the invention, the influence of a magnetic field generated by the winding core on the exterior of the button cell can be greatly reduced while the good corrosion resistance of the shell is ensured, and the increase of the appearance size or the reduction of the internal space of the button cell cannot be caused, so that the winding button cell has remarkable advantages.

Description

Technical Field

[0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a wound button battery and an electroacoustic device using the button battery. Background Art

[0002] A button battery is a cylindrical battery whose height is smaller than its diameter. The jelly roll button battery is prepared in a winding form, which allows the electrode to be made very thin. As a result, lithium batteries using organic electrolytes with poor ionic conductivity have better rate characteristics and are widely used in electrical appliances such as Bluetooth headsets.

[0003] Since the winding structure will form a certain inductance, it will interfere with the magnetic field of electrical appliances. For example, the current pulse of Bluetooth headsets during signal transmission may cause the winding core to produce a strong alternating magnetic field. This magnetic field will interact with the electromagnetic induction sound-generating device of the electroacoustic device to produce the so-called background noise, thereby affecting the sound effect of the electroacoustic device.

[0004] An existing button battery includes a shell and an electrode group, wherein a sealed cavity is provided in the shell, the electrode group is arranged inside the sealed cavity, the sealed cavity is filled with electrolyte, the electrode group includes a diaphragm, a positive electrode sheet, a diaphragm, and a negative electrode sheet stacked in sequence, a transfer metal sheet is fixedly connected to the electrode group, and the other end of the transfer metal sheet is fixedly connected to the shell, so that a laminated structure is adopted to eliminate the inductance characteristics brought by the winding structure and prevent the current pulse from generating a strong alternating magnetic field. However, the production efficiency of the battery using a laminated structure will be very poor; and the electrical connection between the positive / negative electrode sheets of the electrode group needs to occupy a large space, which will greatly reduce the battery design capacity and lose its practical significance for a button battery with a very small diameter. Summary of the invention

[0005] Aiming at the problem that the magnetic field of a wound button battery in the prior art interferes with electrical appliances, a wound button battery and an electroacoustic device are provided.

[0006] The technical solution adopted by the present invention to solve the above technical problems is as follows: In one aspect, the present invention provides a wound button battery, comprising a shell, a cover and a winding core, wherein the shell and the cover are assembled to form a closed cavity, and the winding core is placed in the closed cavity; Optionally, the positive electrode of the winding core is connected to one of the shell and the cover, and the negative electrode of the winding core is connected to the other of the shell and the cover; At least a portion of the cover and / or at least a portion of the shell is configured as a corrosion-resistant magnetic shielding portion; the corrosion-resistant magnetic shielding portion is formed of a first metal material having a relative magnetic permeability ≥ 50 and a chromium content > 10wt%.

[0007] Optionally, the first metal material is an iron-based alloy.

[0008] Optionally, the iron-based alloy is ferrite, or stainless steel containing a ferrite phase.

[0009] Optionally, the iron-based alloy is a duplex stainless steel of austenite and ferrite.

[0010] Optionally, the cover body includes a metal substrate, an electrode terminal and a first insulating ring for sealingly connecting the metal substrate and the electrode terminal, and the metal substrate is welded to the shell; the electrode terminal and / or the metal substrate and / or the shell are configured as the corrosion-resistant magnetic shielding part.

[0011] Optionally, the electrode terminal is set as the corrosion-resistant magnetic shielding part, and the metal substrate and the shell are made of a second metal material; the projection area of ​​the electrode terminal on the normal plane of the winding core axis is ≥ 40% of the cross-sectional area of ​​the wound button battery on the normal plane of the winding core axis.

[0012] Optionally, the electrode terminal, the metal substrate and the shell are all configured as the corrosion-resistant magnetic shielding portion.

[0013] Optionally, the cover body is a cylindrical cover body.

[0014] Optionally, the wound button battery further includes a second insulating ring for sealingly connecting the side of the cylindrical cover and the shell; the cover and / or the shell are configured as the corrosion-resistant magnetic shielding portion.

[0015] Optionally, the cover is configured as the corrosion-resistant magnetic shielding portion, and the shell is made of a second metal material.

[0016] Optionally, the shell and the cover are both configured as corrosion-resistant magnetic shielding parts.

[0017] On the other hand, the present invention provides an electroacoustic device, comprising an electromagnetic induction sound-generating device and a wound button battery of the present invention, wherein the wound button battery is used to power the electroacoustic device.

[0018] Optionally, the corrosion-resistant magnetic shielding portion is spaced between the electromagnetic induction sound-generating device and the winding core of the wound button battery.

[0019] The beneficial effects of the present invention are as follows: in the wound button battery provided by the present invention, at least a portion of the cover body and / or at least a portion of the shell is a first metal material with a relative magnetic permeability ≥50 as a magnetic shielding part. On the one hand, since the magnetic shielding part uses a first metal material with a relative magnetic permeability ≥50, this material can shield and consume the magnetic field generated by the current flowing through the winding core, thereby reducing the interference of the internal magnetic field of the wound button battery on the sound-generating device, and this magnetic shielding part itself is a button battery shell structural member, so this shielding and consumption method of the magnetic field will not increase the volume of the battery additionally, and has good application value; on the other hand, the first metal material of the magnetic shielding part in the cover body and / or the shell in the present application has a high relative magnetic permeability and good corrosion resistance, thereby avoiding the problem of electrochemical corrosion of the magnetic shielding part by the electrolyte in the wound button battery; in summary, the present application has significant advantages in improving magnetic shielding performance, corrosion resistance, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the first wound button battery provided by the present invention; Figure 2 It is a partial structural schematic diagram of the first wound button battery structure provided by the present invention; Figure 3 It is a partial structural schematic diagram of a portable electroacoustic device using the first wound button battery structure provided by the present invention; Figure 4 It is a partial structural schematic diagram of another portable electroacoustic device using the first wound button battery structure provided by the present invention; Figure 5 is a schematic cross-sectional structure diagram of a second wound button battery provided by the present invention; Figure 6 It is a partial structural schematic diagram of a portable electroacoustic device using the second wound button battery structure provided by the present invention; Figure 7 It is a partial structural schematic diagram of another portable electroacoustic device using the second wound button battery structure provided by the present invention.

[0021] The reference numerals in the drawings of the specification are as follows: 1. Shell; 2. Cover; 21. Metal substrate; 22. Electrode terminal; 23. First insulating ring; 3. Winding core; 4. Sealed cavity; 5. Second insulating ring; 6. Electromagnetic induction sound generating device; 7. Corrosion-resistant magnetic shielding part. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Reference Figure 1 , 2 5. The present invention provides a wound button battery, comprising a shell 1, a cover 2 and a winding core 3, wherein the shell 1 and the cover 2 are assembled to form a closed cavity 4, and the winding core 3 is placed in the closed cavity 4; Optionally, the positive electrode of the winding core 3 is connected to one of the shell 1 and the cover 2, and the negative electrode of the winding core 3 is connected to the other of the shell 1 and the cover 2; At least part of the cover 2 and / or at least part of the shell 1 is configured as a corrosion-resistant magnetic shielding portion 7; the corrosion-resistant magnetic shielding portion 7 is made of a first metal material with a relative magnetic permeability ≥ 50 and a chromium element > 10wt%.

[0026] On the one hand, since at least a part of the cover 2 and / or the shell 1 is made of a metal material with a relative magnetic permeability ≥ 50, this material can shield and consume the magnetic field generated by the current flowing through the winding core 3, thereby reducing the interference of the internal magnetic field of the wound button battery on the portable sound-generating device, and this method of shielding and consuming the magnetic field will not increase the volume of the battery, and has good application value; On the other hand, the first metal material of the cover 2 and the shell 1 in the present application has a high relative magnetic permeability and good corrosion resistance, thereby avoiding the problem of corrosion of the magnetic shielding part by the electrolyte in the wound button battery; In summary, the present application has significant advantages in reducing the interference of the internal magnetic field of the battery core to the outside world and improving the corrosion resistance of the magnetic shielding part.

[0027] Specifically, the wound button battery of the present application is suitable for portable sound-generating devices, or other electrical devices that may be disturbed by the magnetic field of the winding core 3 of the wound button battery.

[0028] Specifically, the winding core 3 is formed by winding a positive electrode sheet, a negative electrode sheet and a separator; Specifically, the amount of chromium added to the corrosion-resistant magnetic shielding portion 7 includes, but is not limited to, 11wt%, 15wt%, 19wt%, 20wt%, 25wt% or 30wt%. A sufficiently high amount of chromium helps to form a good passivation film to prevent corrosion of metal materials. Specifically, the relative magnetic permeability of the metal material used to make at least a portion of the cover 2 and / or the shell 1 includes but is not limited to 60, 100, 150, 200, 300, 350, 400, 450, 500 or 1000; a sufficiently high magnetic permeability is beneficial for shielding the magnetic field generated by the winding core.

[0029] In some embodiments, the first metal material is an iron-based alloy.

[0030] Specifically, the iron-based alloy has a high relative magnetic permeability and is used in wound button batteries to shield and consume the magnetic field generated by current flowing through the winding core 3, thereby reducing the interference of the internal magnetic field of the wound button battery on the portable sound-generating device.

[0031] In some embodiments, the iron-based alloy is ferrite, or stainless steel containing a ferrite phase.

[0032] The iron-based alloy is ferrite or stainless steel containing ferrite phase. Ferrite and stainless steel containing ferrite phase usually have higher relative magnetic permeability, which can shield and consume the magnetic field generated by the current flowing through the winding core 3, thereby reducing the interference of the internal magnetic field of the wound button battery on the portable sound device.

[0033] In some embodiments, the iron-based alloy is a duplex stainless steel of austenite and ferrite, which generally has very good corrosion resistance and also has good magnetic conductivity, and can be used as the first metal material of the corrosion-resistant magnetic shielding portion 7 in scenarios requiring higher corrosion resistance.

[0034] Reference Figure 3In some embodiments, the cover body 2 includes an electrode terminal 22, a metal substrate 21, and a first insulating ring 23 for sealingly connecting the electrode terminal 22 and the metal substrate 21, and the metal substrate 21 is welded to the shell 1; the metal substrate 21 and / or the electrode terminal 22 and / or the shell 1 are configured as the corrosion-resistant magnetic shielding portion 7.

[0035] Specifically, the metal substrate 21 and / or the electrode terminal 22 and / or the shell 1 are configured as the corrosion-resistant magnetic shielding portion 7, which is beneficial to improving the magnetic shielding performance and corrosion resistance of the wound button battery.

[0036] Specifically, the material of the first insulating ring 23 includes but is not limited to PP material, PE material, PBT material, epoxy resin material and other polymer insulating materials or ceramic inorganic insulating materials or a mixture thereof.

[0037] In some embodiments, the electrode terminal 22 is configured as the corrosion-resistant magnetic shielding portion 7, the metal substrate 21 and the shell 1 are made of a second metal material; the projection area of ​​the electrode terminal 22 on the normal plane of the axis of the winding core 3 is ≥ 40% of the cross-sectional area of ​​the button battery on the normal plane.

[0038] Specifically, when the electrode terminal 22 is used alone as the corrosion-resistant magnetic shielding portion 7, the projection area of ​​the electrode terminal 22 on the normal plane of the axis of the winding core 3 is ≥ 40% of the cross-sectional area of ​​the button battery on the normal plane, which can have a good magnetic shielding effect. Reference Figure 5 , in some embodiments, the cover body 2 comprises a cylindrical cover body; The wound button battery also includes a second insulating ring 5 for sealingly connecting the side of the cylindrical cover and the shell 1; the cover 2 and / or the shell 1 is configured as the corrosion-resistant magnetic shielding part 7.

[0039] Specifically, the second insulating ring 5 of another embodiment of the present application plays a role in sealing and connecting the side of the cylindrical cover and the housing 1 in the wound button battery. The material of the second insulating ring 5 can be the same as that of the first insulating ring 23. Specifically, the cover 2 and / or the housing 1 is configured as a corrosion-resistant magnetic shielding portion 7, and when assembled into a wound button cell, it has magnetic shielding and / or corrosion resistance-enhancing effects.

[0040] In some embodiments, the cover 2 is configured as the corrosion-resistant magnetic shielding portion 7, and the shell 1 is made of a second metal material.

[0041] In some embodiments, the shell 1 and the cover 2 are both configured as the corrosion-resistant magnetic shielding portion 7 .

[0042] Specifically, the second metal material is different from the first metal material, and specifically, a material such as 022Cr19Ni10 austenitic stainless steel having good corrosion resistance but not having a magnetic shielding function may be used.

[0043] Another embodiment of the present invention provides a portable electroacoustic device, comprising an electromagnetic induction sound-generating device 6 and a wound button battery of the present invention, wherein the wound button battery is used to power the electroacoustic device.

[0044] At least a portion of the cover and / or at least a portion of the shell of the wound button battery is made of a first metal material with a relative magnetic permeability ≥ 50, which shields and consumes the magnetic field generated by the current flowing through the winding core, thereby reducing the interference of the internal magnetic field of the wound button battery on the sound-generating device.

[0045] refer to Figure 3 , 4 , 6, 7, in some embodiments, the electromagnetic induction sound-generating device 6 and the winding core 3 are separated by the corrosion-resistant magnetic shielding portion 7.

[0046] Specifically, in the combination of the electromagnetic induction sound-generating device 6 and the wound button battery, by arranging the corrosion-resistant magnetic shielding part 7 between the electromagnetic induction sound-generating device 6 and the winding core 3, it helps to better reduce the interference of the magnetic field generated by the current inside the winding core on the electromagnetic induction sound-generating device 6, thereby improving the overall sound quality.

[0047] The present invention is further described below by means of specific examples.

[0048] Example 1 This embodiment is used to illustrate a wound button battery disclosed in the present invention, comprising: The shell 1 and the metal substrate 21 are stamped from 022Cr11Ti ferrite stainless steel (chromium content 11wt%) with a relative magnetic permeability of 1000, with a thickness of 0.1mm; the shell 1 has an outer diameter of 12mm and a height of 5.6mm; the metal substrate 21 is a hollow disc with an outer diameter of 12mm and an opening diameter of 5mm; The electrode terminal 22 is made of metal aluminum stamping with a relative magnetic permeability of 1, wherein the terminal portion of the electrode terminal has a thickness of 0.35 mm and a diameter of 4 mm, and the base portion of the electrode terminal has a thickness of 0.12 mm and a diameter of 9 mm; The metal substrate 21 and the electrode terminal 22 are connected as a whole through a first insulating ring 23 with a thickness of 0.05 mm; A winding core 3 with a designed capacity of 90 mAh, which is composed of a positive electrode, a negative electrode and a separator, is assembled into the housing 1, the positive electrode ear of the winding core is connected to the electrode terminal 22, and the negative electrode ear is connected to the housing 1; Inject electrolyte and laser weld the housing 1 and the metal substrate 21 of the cover to complete sealing; The battery is manufactured.

[0049] Example 2 This embodiment is used to illustrate a wound button battery disclosed in the present invention, comprising: The shell 1 and the metal substrate 21 are stamped from 022Cr19Ni5Mo3Si2N austenite-ferrite duplex stainless steel (chromium content 19wt%) with a relative magnetic permeability of 60, with a thickness of 0.1mm. The outer diameter of the shell 1 is 12mm and the height is 5.6mm; the metal substrate 21 is a hollow disc with an outer diameter of 12mm and an opening diameter of 5mm; The electrode terminal 22 is made of metal aluminum stamping with a relative magnetic permeability of 1, wherein the terminal portion is 0.35 mm thick and 4 mm in diameter, and the base portion of the electrode terminal is 0.12 mm thick and 9 mm in diameter; The metal substrate 21 and the electrode terminal 22 are connected as a whole through a first insulating ring 23 with a thickness of 0.05 mm; The core 3 with a designed capacity of 90 mAh composed of the positive electrode, the negative electrode and the separator is assembled into the housing 1, the positive electrode ear of the core is connected to the electrode terminal 22, and the negative electrode ear is connected to the housing 1; Inject electrolyte, and laser weld the housing 1 and the metal substrate 21 to achieve sealing; The battery is manufactured.

[0050] Example 3 This embodiment is used to illustrate a wound button battery disclosed in the present invention, comprising: The shell 1 and the metal substrate 21 are made of 022Cr19Ni5Mo3Si2N austenite-ferrite duplex stainless steel (chromium content 19wt%, ferrite ratio 20%) with a relative magnetic permeability of 60 by stamping, with a thickness of 0.1mm, an outer diameter of 12mm and a height of 5.6mm; the metal substrate is a hollow disc with an outer diameter of 12mm and an opening diameter of 5mm; The electrode terminal 22 is also stamped from 022Cr19Ni5Mo3Si2N austenite-ferrite duplex stainless steel (chromium content 19wt%, ferrite ratio 20%) with a relative magnetic permeability of 60, with a thickness of 0.1mm, wherein the terminal portion protrudes 0.23mm, the protrusion portion has a diameter of 4mm, and the base portion has a diameter of 8mm; The metal substrate 21 and the electrode terminal 22 are connected as a whole through a first insulating ring 23 with a thickness of 0.05 mm; The core 3 with a designed capacity of 90 mAh composed of the positive electrode, the negative electrode and the separator is assembled into the housing 1, the positive electrode ear of the core is connected to the electrode terminal 22, and the negative electrode ear is connected to the housing 1; Inject electrolyte and laser weld the housing 1 and the metal substrate 21 of the cover to complete sealing; The battery is manufactured.

[0051] Example 4 This embodiment is used to illustrate a wound button battery disclosed in the present invention, comprising: The shell 1 and the metal substrate 21 are made of (relative magnetic permeability 1) 022Cr19Ni10 austenitic stainless steel by stamping, with a thickness of 0.1mm. The outer diameter of the shell 1 is 12mm and the height is 5.6mm. The metal substrate 21 is a hollow disk with an outer diameter of 12mm and an opening diameter of 5mm. The electrode terminal 22 is made of 022Cr19Ni5Mo3Si2N austenite-ferrite duplex stainless steel (chromium content 19wt%, ferrite ratio 20%) with a relative magnetic permeability of 60, and is stamped, with a thickness of 0.1mm, wherein the terminal portion is convex by 0.23mm, the convex portion has a diameter of 4mm, and the base portion has a diameter of 10mm; The projection area of ​​the electrode terminal 22 on the normal plane of the winding core axis is 69% of the cross-sectional area of ​​the button battery on the normal plane; The metal substrate 21 and the electrode terminal 22 are connected as a whole through a first insulating ring 23 with a thickness of 0.05 mm; The core 3 with a designed capacity of 90 mAh formed by winding the positive electrode, the negative electrode and the separator is assembled into the shell 1, the positive electrode ear of the core 3 is connected to the electrode terminal 22, and the negative electrode ear is connected to the shell 1; Inject electrolyte and laser weld the housing 1 and the metal substrate 21 of the cover to complete sealing; The battery is manufactured.

[0052] Example 5 This embodiment is used to illustrate a wound button battery disclosed in the present invention, comprising: The shell 1 and the metal substrate 21 are made of 022Cr19Ni10 austenitic stainless steel (relative magnetic permeability 1) by stamping, with a thickness of 0.1mm, an outer diameter of the shell of 12mm, and a height of 5.6mm; the metal substrate is a hollow disk with an outer diameter of 12mm and an opening diameter of 5mm; The electrode terminal 22 is made of 022Cr19Ni5Mo3Si2N austenite-ferrite duplex stainless steel (chromium content 19wt%, ferrite 50%, relative magnetic permeability = 150) by stamping, with a thickness of 0.1mm, wherein the terminal part is convex 0.23mm, the convex part diameter is 4mm, and the base part diameter is 9mm; The projection area of ​​the electrode terminal 22 on the normal plane of the winding core axis is 56% of the cross-sectional area of ​​the button battery on the normal plane; The metal substrate 21 and the electrode terminal 22 are connected as a whole through a first insulating ring 23 with a thickness of 0.05 mm; The core 3 with a designed capacity of 90 mAh formed by winding the positive electrode, the negative electrode and the separator is assembled into the shell 1, the positive electrode ear of the core 3 is connected to the electrode terminal 22, and the negative electrode ear is connected to the shell 1; Inject electrolyte and laser weld the housing 1 and the metal substrate 21 of the cover to complete sealing; The battery is manufactured.

[0053] Example 6 This embodiment is used to illustrate a wound button battery disclosed in the present invention, comprising: The shell 1 and the metal substrate 21 are stamped and made of 022Cr19Ni10 austenitic stainless steel (relative magnetic permeability 1), with a thickness of 0.1mm. The outer diameter of the shell 1 is 12mm and the height is 5.6mm; the metal substrate 21 is a hollow disk with an outer diameter of 12mm and an opening diameter of 5mm; The electrode terminal 22 is made of 008Cr30Mo2 ferritic stainless steel (chromium content 30wt%, relative magnetic permeability = 500) by stamping, with a thickness of 0.1mm, wherein the terminal part is convex by 0.23mm, the convex part has a diameter of 4mm, and the base part has a diameter of 8mm; The projection area of ​​the electrode terminal 22 on the normal plane of the winding core axis is 44% of the cross-sectional area of ​​the button battery on the normal plane; The metal substrate 21 and the electrode terminal 22 are connected as a whole through a first insulating ring 23 with a thickness of 0.05 mm; The core 3 with a designed capacity of 90 mAh formed by winding the positive electrode, the negative electrode and the separator is assembled into the shell 1, the positive electrode ear of the core 3 is connected to the electrode terminal 22, and the negative electrode ear is connected to the shell 1; Inject electrolyte and laser weld the housing 1 and the metal substrate 21 of the cover to complete sealing; The battery is manufactured.

[0054] Example 7 This embodiment is used to illustrate a wound button battery disclosed in the present invention, comprising: like Figure 4 , Shell 1 is stamped from 022Cr19Ni10 austenitic stainless steel (relative magnetic permeability 1), with a thickness of 0.15mm, an outer diameter of 12mm, and a height of 5.2mm; The cylindrical cover 2 is made of 022Cr19Ni5Mo3Si2N austenite-ferrite duplex stainless steel (chromium content 19wt%, ferrite 50%, relative magnetic permeability = 150) by stamping, with a thickness of 0.15mm, an outer diameter of 11.5mm, and a height of 5.2mm; The core 3 with a designed capacity of 90 mAh formed by winding the positive electrode, the negative electrode and the separator is assembled into the housing 1, the positive electrode ear of the core 3 is connected to the cover 2, and the negative electrode ear is connected to the housing 1; The electrolyte is injected, and the cover 2 and the shell 1 are combined together with the second insulating ring 5 between them, and the shell is sealed with the cover by mechanically crimping the shell; The battery is manufactured.

[0055] Example 8 This embodiment is used to illustrate a wound button battery disclosed in the present invention, comprising: like Figure 4 The shell 1 is stamped from 022Cr19Ni5Mo3Si2N austenite-ferrite duplex stainless steel (chromium content 19wt%, ferrite 50%, relative magnetic permeability = 150), with a thickness of 0.15mm, an outer diameter of 12mm, and a height of 5.2mm; The cylindrical cover 2 is made of 022Cr19Ni10 austenitic stainless steel (relative magnetic permeability 1) by stamping, with a thickness of 0.15mm, an outer diameter of 11.5mm, and a height of 5.2mm; The core 3 with a designed capacity of 90 mAh formed by winding the positive electrode, the negative electrode and the separator is assembled into the housing 1, the positive electrode ear of the core 3 is connected to the cover 2, and the negative electrode ear is connected to the housing 1; The electrolyte is injected, and the cover 2 and the shell 1 are combined together with the second insulating ring 5 between them, and the shell is sealed with the cover by mechanically crimping the shell; The battery is manufactured.

[0056] Example 9 This embodiment is used to illustrate a wound button battery disclosed in the present invention, comprising: like Figure 4 The shell 1 is made of 008Cr30Mo2 ferritic stainless steel (chromium content 30wt%, relative magnetic permeability = 500) by stamping, with a thickness of 0.15mm, an outer diameter of 12mm, and a height of 5.2mm; The cylindrical cover 2 is also made of 008Cr30Mo2 ferrite stainless steel (chromium content 30wt%, relative magnetic permeability = 500) by stamping, with a thickness of 0.15mm, an outer diameter of 11.5mm, and a height of 5.2mm; A winding core 3 with a designed capacity of 90 mAh consisting of a positive electrode, a negative electrode and a separator is placed into the housing 1, the positive electrode ear of the winding core 3 is connected to the cover 2, and the negative electrode ear is connected to the housing 1; The electrolyte is injected, and the cover 2 and the shell 1 are combined together with the second insulating ring 5 between them, and the shell is sealed with the cover by mechanically crimping the shell; The battery is manufactured.

[0057] Comparative Example 1 This comparative example is used to compare and illustrate a wound button battery disclosed in the present invention, comprising: The shell 1 and the metal substrate 21 are made of 022Cr19Ni10 austenitic stainless steel (relative magnetic permeability 1) by stamping, with a thickness of 0.1mm. The shell 1 has an outer diameter of 12mm and a height of 5.6mm. The metal substrate 21 is a hollow disk with an outer diameter of 12mm and an opening diameter of 5mm. The electrode terminal 22 is made of metal aluminum stamping with a relative magnetic permeability of 1, wherein the terminal portion is 0.35 mm thick and 4 mm in diameter, and the base portion of the electrode terminal is 0.12 mm thick and 9 mm in diameter; The metal substrate 21 and the electrode terminal 22 are connected as a whole through a first insulating ring 23 with a thickness of 0.05 mm; The core 3 with a designed capacity of 90 mAh formed by winding the positive electrode, the negative electrode and the separator is assembled into the shell 1, the positive electrode ear of the core 3 is connected to the electrode terminal 22, and the negative electrode ear is connected to the shell 1; Inject electrolyte and laser weld the housing 1 and the metal substrate 21 of the cover to complete sealing; The battery is manufactured.

[0058] Comparative Example 2 This comparative example is used to compare and illustrate a wound button battery disclosed in the present invention, comprising: like Figure 4 , Shell 1 is stamped from 022Cr19Ni10 austenitic stainless steel (relative magnetic permeability 1), with a thickness of 0.15mm, an outer diameter of 12mm, and a height of 5.2mm; The cylindrical cover 2 is also stamped from 022Cr19Ni10 austenitic stainless steel (relative magnetic permeability 1), with a thickness of 0.15 mm, an outer diameter of 11.5 mm, and a height of 5.2 mm; The core 3 with a designed capacity of 90 mAh formed by winding the positive electrode, the negative electrode and the separator is assembled into the housing 1, the positive electrode ear of the core 3 is connected to the cover 2, and the negative electrode ear is connected to the housing 1; The electrolyte is injected, and the cover 2 and the shell 1 are combined together with the second insulating ring 5 between them, and the shell is sealed with the cover by mechanically crimping the shell; The battery is manufactured.

[0059] Comparative Example 3 This comparative example is used to compare and illustrate a wound button battery disclosed in the present invention, comprising: The shell 1 and the metal substrate 21 are made of 022Cr19Ni10 austenitic stainless steel (relative magnetic permeability 1) by stamping, with a thickness of 0.1mm. The shell 1 has an outer diameter of 12mm and a height of 5.6mm. The metal substrate 21 is a hollow disk with an outer diameter of 12mm and an opening diameter of 5mm. The electrode terminal 22 is made of Permalloy Ni45-Fe55 (chromium content 0, relative magnetic permeability 4000) by stamping, with a thickness of 0.1 mm, wherein the terminal portion is convex by 0.23 mm, the convex portion has a diameter of 4 mm, and the base portion has a diameter of 8 mm; The projection area of ​​the electrode terminal 22 on the normal plane of the winding core axis is 44% of the cross-sectional area of ​​the button battery on the normal plane; The metal substrate 21 and the electrode terminal 22 are connected as a whole through a first insulating ring 23 with a thickness of 0.05 mm; A winding core 3 with a designed capacity of 90 mAh consisting of a positive electrode, a negative electrode and a separator is placed into the housing 1, the positive electrode tab of the winding core 3 is connected to the electrode terminal 22, and the negative electrode tab is connected to the housing 1; Inject electrolyte and laser weld the housing 1 and the metal substrate 21 of the cover to complete sealing; The battery is manufactured.

[0060] Comparative Example 4 This comparative example is used to compare and illustrate a wound button battery disclosed in the present invention, comprising: like Figure 4 The shell 1 is made of Permalloy Ni45-Fe55, with a chromium content of 0 and a relative magnetic permeability of 4000, and is stamped with a thickness of 0.15mm, an outer diameter of 12mm, and a height of 5.2mm; The cylindrical cover 2 is also made of Permalloy Ni45-Fe55, with a chromium content of 0 and a relative magnetic permeability of 4000, and is punched, with a thickness of 0.15 mm, an outer diameter of 11.5 mm, and a height of 5.2 mm; The core 3 with a designed capacity of 90 mAh formed by winding the positive electrode, the negative electrode and the separator is assembled into the housing 1, the positive electrode ear of the core 3 is connected to the cover 2, and the negative electrode ear is connected to the housing 1; The electrolyte is injected, and the cover 2 and the shell 1 are combined together with the second insulating ring 5 between them, and the shell is sealed with the cover by mechanically crimping the shell; The battery is manufactured.

[0061] Performance Testing The following performance tests were performed on Examples 1-9 and Comparative Examples 1-4 prepared as above: Corrosion resistance test Electrochemical corrosion resistance: The finished battery was charged at 90mA 4.40V CCCV 2mA cut off and discharged at 90mA 3.0V cut off at 25 degrees Celsius for 3 cycles; the battery was disassembled in a dry room and the inner sides of the shell 1 and the cover 2 were observed for corrosion and discoloration.

[0062] Magnetic shielding effect test Weld aluminum wires to the positive and negative electrodes of the button battery, charge it with 90mA 4.40V 2mA cut off CCCV, then place it in zero magnetic space, discharge it with a 200mA 0.01 second pulse current, one pulse per second, and measure the peak magnetic field intensity (absolute value) vertically up / down close to the center of the top / bottom of the battery with a fluxgate gaussmeter with a sensitivity of 0.1mGs.

[0063] The test results obtained are entered in Table 1.

[0064] Table 1

[0065] It can be seen from the test results in Table 1 that the comprehensive electrochemical corrosion resistance and magnetic shielding effect of Example 1-9 are better than those of Comparative Example 1-4 as a whole; among them, compared with Comparative Example 1-2, the magnetic field intensity of Example 1-9 is reduced by 30% or more on the side where the corrosion-resistant magnetic shielding part is configured, and the magnetic shielding effect is significantly better than that of Comparative Example 1-2 of the prior art; compared with Comparative Example 3-4, the inner surface of the metal part of the outer shell of Comparative Example 3-4 changes color and turns black after charging and discharging, that is, it is corroded by the electrolyte, which shows that it is not suitable as a lithium-ion battery shell; Compared with Examples 1-2, the magnetic shielding effect of Example 1 is better than that of Example 2, indicating that the first metal material has a better magnetic shielding effect when using ferritic stainless steel. However, since ferrite-austenite duplex stainless steel has better corrosion resistance, it is suitable for more demanding environments or working conditions. Compared with Examples 2-3, when the shell, metal substrate and electrode terminals of the wound button battery are all made of the first metal material, the magnetic shielding effect is better on both the positive and negative sides. Compared with Examples 3-6, when only the first metal material is used in the electrode terminal, while ensuring good magnetic shielding effect and anti-corrosion effect, the use of the first metal material is reduced, which is conducive to simplifying the processing of the shell and the metal substrate and reducing material costs. From the test results of Examples 2-4, it can be seen that when the relative magnetic permeability of the first metal material is greater than or equal to 50, it has a good magnetic shielding effect. The shell, metal substrate and electrode terminals in Comparative Examples 1 and 2 are all made of materials with a relative magnetic permeability of 1, and the magnetic fields on the positive and negative sides are very strong, which can easily cause signal interference to the external structure; it can be concluded from Comparative Example 4 and Example 9 that although Permalloy as a magnetic shielding part also has a good magnetic shielding effect, it has serious problems in resistance to electrolyte corrosion; in summary, the alloy used in this application has good magnetic shielding performance and good corrosion resistance.

[0066] Electroacoustic device embodiment with magnetic shielding The button batteries of Examples 1-9 all adopt a structure in which the cover 2 is the positive electrode and the shell 1 is the negative electrode.

[0067] like Figure 3 , 6 As shown, in embodiments 3-7 and embodiment 9 where the corrosion-resistant magnetic shielding portion 7 is located on the positive electrode side, the sound-generating device can be placed near the center above the positive electrode side (upper cover); like Figure 4 , 7 As shown, in embodiments 1-3, embodiments 8, and 9 where the corrosion-resistant magnetic shielding portion 7 is located on the negative pole side, the sound-generating device can be placed near the center of the lower portion of the negative pole side (shell).

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wound button battery, comprising a shell (1), a cover (2) and a winding core (3), wherein the shell (1) and the cover (2) are assembled to form a sealed cavity (4), and the winding core (3) is placed in the sealed cavity (4); characterized in that: At least a portion of the cover (2) and / or at least a portion of the shell (1) is provided as a corrosion-resistant magnetic shielding portion (7); the corrosion-resistant magnetic shielding portion (7) is formed of a first metal material having a relative magnetic permeability of ≥50 and a chromium content of >10 wt%.

2. A wound button battery according to claim 1, characterized in that: The first metal material is an iron-based alloy.

3. A wound button battery according to claim 2, characterized in that: The iron-based alloy is ferrite, or stainless steel containing a ferrite phase.

4. A wound button battery according to claim 2, characterized in that: The iron-based alloy is a duplex stainless steel of austenite and ferrite.

5. A wound button battery according to any one of claims 1 to 4, characterized in that: The cover body (2) comprises a metal substrate (21), an electrode terminal (22) and a first insulating ring (23) for sealingly connecting the metal substrate (21) and the electrode terminal (22); the metal substrate (21) is welded to the shell (1); the electrode terminal (22) and / or the metal substrate (21) and / or the shell (1) are configured as the corrosion-resistant magnetic shielding portion (7).

6. A wound button battery according to claim 5, characterized in that: The electrode terminal (22) is configured as the corrosion-resistant magnetic shielding portion (7); the metal substrate (21) and the shell (1) are made of a second metal material; and the projection area of ​​the electrode terminal (22) on a plane normal to the axis of the winding core (3) is ≥ 40% of the cross-sectional area of ​​the wound button battery on a plane normal to the axis of the winding core (3).

7. A wound button battery according to claim 5, characterized in that: The electrode terminal (22), the metal substrate (21) and the housing (1) are all provided as the corrosion-resistant magnetic shielding portion (7).

8. The wound button battery according to claim 1, characterized in that: The cover body (2) is a cylindrical cover body; The wound button battery further comprises a second insulating ring (5) for sealingly connecting the side of the cylindrical cover (2) and the shell (1); the cover (2) and / or the shell (1) are configured as the corrosion-resistant magnetic shielding portion (7).

9. A wound button battery according to claim 8, characterized in that: The cover body (2) is configured as the corrosion-resistant magnetic shielding portion (7), and the shell (1) is made of a second metal material.

10. A wound button battery according to claim 8, characterized in that: The shell (1) and the cover (2) are both configured as corrosion-resistant magnetic shielding parts (7).

11. An electroacoustic device, characterized in that It comprises an electromagnetic induction sound-generating device (6), and a wound button battery as claimed in any one of claims 1 to 10, wherein the wound button battery is used to power the electroacoustic device.

12. An electroacoustic device according to claim 11, characterized in that: The corrosion-resistant magnetic shielding portion (7) is located between the electromagnetic induction sound-generating device (6) and the winding core (3) of the wound button battery.

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