CN113381079B - Winding type battery and TWS Bluetooth headset - Google Patents
Winding type battery and TWS Bluetooth headset Download PDFInfo
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- CN113381079B CN113381079B CN202110639154.5A CN202110639154A CN113381079B CN 113381079 B CN113381079 B CN 113381079B CN 202110639154 A CN202110639154 A CN 202110639154A CN 113381079 B CN113381079 B CN 113381079B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The application discloses a winding type battery, which comprises a winding type battery cell, a positive electrode shell and a negative electrode shell, wherein a positive electrode plate of the winding type battery cell is connected with the positive electrode shell, and a negative electrode plate of the winding type battery cell is connected with the negative electrode shell; the winding type battery cell comprises a plurality of battery cell layers, the spiral directions of all the battery cell layers are the same, adjacent battery cell layers are connected through pole pieces with preset widths, current output by each battery cell layer is transmitted to the adjacent battery cell layers through the pole pieces with the preset widths, and the adjacent battery cell layers generate magnetic fields with opposite directions when the winding type battery cell is electrified. The magnetic field interference generated by the winding type battery can be reduced. The application also discloses a TWS Bluetooth headset, which has the beneficial effects.
Description
Technical Field
The application relates to the technical field of battery design, in particular to a winding type battery and a TWS Bluetooth headset.
Background
In recent years, the development of small lithium batteries has been greatly promoted by the popularization of a TWS (True Wireless Stereo) bluetooth headset, and a large number of rechargeable button lithium batteries are used. The manufacturing methods of button battery cells on the market at present mainly include a laminated type and a winding type. The electric core of the winding type button battery is a coil with a winding mode similar to a spiral, and when the battery works, the magnetic field generated by the current flowing through the winding type electric core can interfere with electromagnetic sensing parts around the battery.
Therefore, how to reduce the magnetic field interference generated by the wound battery is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The utility model aims at providing a coiling formula battery and TWS bluetooth headset, can reduce the magnetic field interference that coiling formula battery produced.
In order to solve the technical problem, the application provides a winding type battery, which comprises a winding type battery cell, a positive electrode shell and a negative electrode shell, wherein a positive electrode plate of the winding type battery cell is connected with the positive electrode shell, and a negative electrode plate of the winding type battery cell is connected with the negative electrode shell;
the winding type battery cell comprises a plurality of battery cell layers, the spiral directions of all the battery cell layers are the same, adjacent battery cell layers are connected through pole pieces with preset widths, current output by each battery cell layer is transmitted to the adjacent battery cell layers through the pole pieces with the preset widths, and the adjacent battery cell layers generate magnetic fields with opposite directions when the winding type battery cell is electrified.
Optionally, the winding type battery cell comprises an even number of battery cell layers.
Optionally, when the number of the core layers included in the winding type battery cell is equal to 2, the battery cell layers are connected through a tail pole piece or a head pole piece of the winding type battery cell;
when the number of the electric core layers included in the winding type electric core is more than 2, the Nth electric core layer and the (N + 1) th electric core layer are connected through a tail pole piece, and the (N + 1) th electric core layer and the (N + 2) th electric core layer are connected through a head pole piece;
the tail pole piece is a part of the pole piece which is far away from the center end of the spiral, and the width of the tail pole piece along the spiral direction is a preset width; the head pole piece is a part of the pole piece which is close to the spiral central end and is in the width of the spiral direction, and the width of the head pole piece in the spiral direction is a preset width.
Optionally, an insulating diaphragm is disposed between adjacent cell layers.
Optionally, an insulating diaphragm is disposed between the positive electrode plate and the negative electrode plate of the winding-type battery cell.
Optionally, the positive electrode plate of the winding-type battery cell is connected with the positive casing through a positive electrode tab, and the negative electrode plate of the winding-type battery cell is connected with the negative casing through a negative electrode tab.
Optionally, the positive casing and the negative casing are connected and fixed through an insulating sealing layer.
Optionally, all the battery cell layers have the same spiral turns and spiral density degree of the pole pieces.
The application also provides a TWS Bluetooth headset, which comprises the winding type battery and the loudspeaker.
Optionally, a magnetic shield is disposed between the wound battery and the speaker.
The application provides a winding type battery, which comprises a winding type battery cell, a positive electrode shell and a negative electrode shell, wherein a positive electrode plate of the winding type battery cell is connected with the positive electrode shell, and a negative electrode plate of the winding type battery cell is connected with the negative electrode shell; the winding type battery cell comprises a plurality of battery cell layers, the spiral directions of all the battery cell layers are the same, adjacent battery cell layers are connected through pole pieces with preset widths, current output by each battery cell layer is transmitted to the adjacent battery cell layers through the pole pieces with the preset widths, and the adjacent battery cell layers generate magnetic fields with opposite directions when the winding type battery cell is electrified.
The utility model provides a coiling type battery includes coiling type electric core, positive pole shell and negative pole shell, and above-mentioned coiling type electric core includes a plurality of electric core layers, connects through the pole piece of predetermineeing the width between the electric core layer. When the coiled battery is electrified, the current is transmitted between each electric core layer in sequence, namely, the current output by each electric core layer is transmitted to the adjacent electric core layer through the pole piece with the preset width, and further, the spiral directions of the electric core layers are the same, so that the adjacent electric core layers can generate magnetic fields with opposite directions. Because winding-type electric core includes multilayer electric core layer in this application, the magnetic field opposite direction of adjacent electric core layer in the winding-type electric core, the magnetic field of the two offsets each other promptly, and then reduces the magnetic field that winding-type battery during operation produced, has reduced winding-type battery and has disturbed to external magnetic field. This application still provides a TWS bluetooth headset simultaneously, has above-mentioned beneficial effect, no longer gives unnecessary details here.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of a wound cell in a wound battery according to an embodiment of the present disclosure;
fig. 2 is a schematic cross-sectional view of a first winding type battery cell provided in an embodiment of the present application;
fig. 3 is a schematic current flow diagram of each cell layer in a first winding type battery cell provided in an embodiment of the present application;
fig. 4 is a schematic cross-sectional view of a second winding type battery cell provided in an embodiment of the present application;
fig. 5 is a schematic current flow diagram of each cell layer in a second winding type battery cell provided in an embodiment of the present application;
fig. 6 is a schematic current flow diagram of each core layer in a third winding type battery cell provided in an embodiment of the present application;
fig. 7 is a schematic structural diagram of a winding type button battery according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a wound battery cell in a wound battery according to an embodiment of the present disclosure. Only the uppermost two layers and the lowermost two layers are shown in fig. 1, and a multi-layer electric core layer may be further included in the middle. The winding battery where the winding battery cell shown in fig. 1 is located includes a winding battery cell, a positive electrode shell and a negative electrode shell, a positive electrode plate of the winding battery cell is connected with the positive electrode shell, and a negative electrode plate of the winding battery cell is connected with the negative electrode shell.
As shown in fig. 1, a plurality of core layers may be included in a wound cell, and all the core layers have the same spiral direction, that is: both counterclockwise and clockwise. All the projections of the electric core layers in the vertical direction are overlapped, the adjacent electric core layers are connected through a pole piece 100 with a preset width, the current output by each electric core layer is transmitted to the adjacent electric core layer through the pole piece with the preset width, and the adjacent electric core layers generate magnetic fields with opposite directions when the winding type electric core is electrified. Taking the winding type battery cell shown in fig. 1 as an example, the current direction of the first layer of the battery cell layer is clockwise and the magnetic field direction is downward, and the current direction of the second layer of the battery cell layer is counterclockwise and the magnetic field direction is upward.
It can be understood that, a general winding-type battery cell in the field is obtained by winding a pole piece, the winding-type battery cell provided in the present application can be obtained by cutting off part of the pole piece of the general winding-type battery cell, and adjacent battery cell layers are connected by a single-layer pole piece. As a possible embodiment, the thickness (i.e., the length in the direction of the central axis) of each of the core layers is the same. The adjacent electrode layers are connected only through the pole piece 100 with a preset width, and the preset width can be 20% -5% of the length of the spiral line of the outermost ring of the pole piece. All the battery cell layers in the embodiment have the same spiral turns and spiral density degree of the pole pieces. The larger the width of the pole piece for connecting the adjacent electric core layers is, the more pole piece areas short-circuited in the winding type electric core are, and the larger the deviation between the actual output and the standard output of the winding type battery is further caused; the smaller the width of the pole piece used for connecting the adjacent electric core layers is, the obvious temperature rise of the pole piece at the connecting part can cause the abnormal temperature of the winding type battery. When the preset width of the pole piece connected with the adjacent electric core layer is set to be 20% -5% of the length of the spiral line of the outermost ring pole piece, the actual output effect and the working temperature of the winding type battery can be considered.
The winding type battery provided by the embodiment comprises a winding type battery cell, a positive electrode shell and a negative electrode shell, wherein the winding type battery cell comprises a plurality of battery cell layers, and the battery cell layers are connected through pole pieces with preset widths. When the coiled battery is electrified, the current is transmitted between each electric core layer in sequence, namely, the current output by each electric core layer is transmitted to the adjacent electric core layer through the pole piece with the preset width, and further, the spiral directions of the electric core layers are the same, so that the adjacent electric core layers can generate magnetic fields with opposite directions. Because the winding type battery cell in the embodiment comprises the multiple layers of the battery cell layers, the directions of the magnetic fields of the adjacent battery cell layers in the winding type battery cell are opposite, namely the magnetic fields of the adjacent battery cell layers are mutually offset, so that the magnetic field generated when the winding type battery works is reduced, and the magnetic field interference of the winding type battery to the outside is reduced.
Further, the wound cell may include an even number of core layers.
Referring to fig. 2, fig. 2 is a schematic cross-sectional view of a first winding type battery cell provided in an embodiment of the present application, a cutting direction of the cross-sectional view shown in fig. 2 is perpendicular to a winding direction of the winding type battery cell, and an obtained cross-section is intersected with a pole piece 100 with a preset width. In this embodiment, the pole piece 100 with the preset width for connecting the core layer is a tail pole piece of the winding-type electrical core, the tail pole piece includes a part of the pole piece away from the spiral center end, and the width of the tail pole piece along the spiral direction is the preset width. When the number of the electric core layers included in the winding type electric core is equal to 2, the electric core layers are connected through the tail pole piece of the winding type electric core. Referring to fig. 3, fig. 3 is a schematic view of a current flow direction of each core layer in a first winding type battery cell provided in an embodiment of the present application, where after current is transmitted through a pole piece with a preset width by an adjacent core layer, a direction of the current changes, that is, a direction of a magnetic field changes.
Referring to fig. 4, fig. 4 is a schematic cross-sectional view of a second winding type battery cell provided in an embodiment of the present application, a cutting direction of the cross-sectional view shown in fig. 4 is perpendicular to a winding direction of the winding type battery cell, and an obtained cross-section is intersected with a pole piece 100 with a preset width. In this embodiment, the pole piece with the preset width for connecting the core layer is a head pole piece of the winding-type battery cell, the head pole piece includes a part of the pole piece close to the spiral center end, and the width of the head pole piece along the spiral direction is the preset width. When the number of the core layers included in the winding type battery cell is equal to 2, the battery cell layers are connected through the head pole piece of the winding type battery cell. Referring to fig. 5, fig. 5 is a schematic view of a current flow direction of each core layer in a second winding type battery cell provided in the embodiment of the present application, where after current is transmitted through a pole piece with a preset width by an adjacent core layer, a direction of the current changes, that is, a direction of a magnetic field changes.
Referring to fig. 6, fig. 6 is a schematic view of a current flow direction of each core layer in a third winding type battery cell provided in an embodiment of the present application, and fig. 6 shows that when the number of the core layers included in the winding type battery cell is greater than 2, the arrangement positions of the adjacent pole pieces with the preset width are: the N layer of electric core layer and the (N + 1) th layer of electric core layer are connected through a tail pole piece, and the (N + 1) th layer of electric core layer and the (N + 2) th layer of electric core layer are connected through a head pole piece.
Further, an insulating diaphragm is arranged between the adjacent electric core layers; an insulating diaphragm is arranged between the positive pole piece and the negative pole piece of the winding type battery cell. The pole pieces of the winding type battery cell comprise a positive pole piece and a negative pole piece, and the positive pole piece and the negative pole piece exist in pairs.
Furthermore, the positive pole piece of the winding type battery cell is connected with the positive shell through a positive pole tab, and the negative pole piece of the winding type battery cell is connected with the negative shell through a negative pole tab. The positive shell and the negative shell are connected and fixed through the insulating sealing layer, and the positive shell and the negative shell form a closed space. Above-mentioned insulating sealing layer can be insulating sealing double faced adhesive tape, uses insulating sealing double faced adhesive tape to connect the inseparable degree of connection that positive pole shell and negative pole shell can optimize positive pole shell and negative pole shell, promotes the steadiness of coiling formula battery.
The flow described in the above embodiment is explained below by an embodiment in practical use.
The embodiment provides a winding type button battery, and the positive and negative pole pieces in the battery are designed into a C-shaped structure by utilizing an electromagnetic induction principle, so that magnetic fields generated by the current directions of the upper layer and the lower layer are opposite when the current runs along the pole pieces and are just offset, and the interference of the battery on a system can be reduced due to the fact that the magnetic fields generated in the battery working process can be reduced or eliminated due to the special shape of the battery winding type pole pieces. Taking the TWS bluetooth headset with the coiled button battery disposed behind the speaker as an example, the coiled button battery of the embodiment can effectively suppress the bottom noise problem caused by the interference of the magnetic field of the battery on the speaker. Furthermore, the winding type button battery is obtained by winding the pole piece with the C-shaped structure and can be integrally formed in the production process, so that the production process can be simplified and the manufacturing cost can be saved.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a winding type button cell provided in the embodiment of the present application, and as shown in fig. 7, the winding type button cell includes a negative electrode casing 701, an insulating sealing layer 702, a positive electrode casing 703, a positive electrode tab 704, a positive electrode tab 705, an insulating diaphragm 706, a negative electrode tab 707, and a negative electrode tab 708.
The positive pole piece 704, the insulating diaphragm 706 and the negative pole piece 707 are spirally wound in the negative pole shell 701, and the insulating diaphragm 706 is clamped between the positive pole piece 704 and the negative pole piece 707 to isolate the positive pole piece 704 and the negative pole piece 707. The negative electrode shell 701 is electrically connected with the negative electrode plate 707 through a negative electrode tab 708, the positive electrode shell 703 is electrically connected with the positive electrode plate 704 through a positive electrode tab 705, and two ends of the tab are respectively welded on the electrode plate and the shell. The negative electrode shell 701 and the positive electrode shell 703 are bonded and fixed through an insulating sealing layer 702, so that the sealing of the battery and the insulation of the positive electrode and the negative electrode are ensured. The positive electrode plate 704 and the negative electrode plate 707 are C-shaped structures, as shown in fig. 2. The current in the positive pole piece 704 and the negative pole piece 707 is schematically shown in fig. 3, it can be seen that the spiral directions of the upper layer current and the lower layer current of the pole pieces are opposite, and it can be known from the electromagnetic induction principle that the directions of the upper layer magnetic field and the lower layer magnetic field are opposite, the magnitudes of the upper layer magnetic field and the lower layer magnetic field are equal, and the upper layer magnetic field and the lower layer magnetic field can be mutually offset.
The positive and negative pole pieces in the battery are designed into a C-shaped structure by utilizing the electromagnetic induction principle, so that the magnetic fields generated by the current directions of the upper layer and the lower layer when the current runs along the pole pieces are offset, and the interference of the battery on a system is reduced.
The application also provides a TWS Bluetooth headset, the winding type battery and the loudspeaker introduced in the embodiment are provided with the magnetic separation sheet between the winding type battery and the loudspeaker.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the device disclosed by the embodiment, the description is simple because the device corresponds to the scheme disclosed by the embodiment, and the relevant points can be referred to the scheme part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, scheme, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, scheme, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, arrangement, article, or apparatus that comprises the same element.
Claims (9)
1. A coiled battery is characterized by comprising a coiled battery cell, a positive electrode shell and a negative electrode shell, wherein a positive electrode plate of the coiled battery cell is connected with the positive electrode shell, and a negative electrode plate of the coiled battery cell is connected with the negative electrode shell;
the winding type battery cell comprises a plurality of battery cell layers, the spiral directions of all the battery cell layers are the same, the adjacent battery cell layers are connected through a pole piece with a preset width, current output by each layer of the battery cell layer is transmitted to the adjacent battery cell layer through the pole piece with the preset width, and the adjacent battery cell layers generate magnetic fields with opposite directions when the winding type battery cell is electrified; the positive pole piece and the negative pole piece are C-shaped pole pieces;
when the number of the electric core layers included in the winding type electric core is equal to 2, the electric core layers are connected through a tail pole piece or a head pole piece of the winding type electric core;
when the number of the core layers included in the winding type battery cell is larger than 2, the nth layer of the core layer and the (N + 1) th layer of the battery cell layer are connected through the tail pole piece, and the (N + 1) th layer of the core layer and the (N + 2) th layer of the battery cell layer are connected through the head pole piece;
the tail pole piece is a part of the pole piece which is far away from the center end of the spiral, and the width of the tail pole piece along the spiral direction is the preset width; the head pole piece is a partial pole piece which is close to the spiral central end in the pole piece, and the width of the head pole piece in the spiral direction is the preset width.
2. A coiled battery according to claim 1, wherein the coiled cell comprises an even number of the core layers.
3. A rolled battery as claimed in claim 1, wherein an insulating separator is provided between adjacent core layers.
4. A coiled battery according to claim 1, wherein an insulating diaphragm is arranged between the positive pole piece and the negative pole piece of the coiled battery cell.
5. The coiled battery of claim 1, wherein the positive pole piece of the coiled cell is connected to the positive casing via a positive pole tab, and the negative pole piece of the coiled cell is connected to the negative casing via a negative pole tab.
6. A rolled battery as claimed in claim 1, wherein the positive electrode case and the negative electrode case are connected and fixed by an insulating sealing layer.
7. A coiled battery according to any one of claims 1 to 6, wherein all the core layers have the same number of turns of the pole piece and the same degree of density of the spirals.
8. A TWS Bluetooth headset comprising the wound battery of any one of claims 1 to 7 and a speaker.
9. A TWS Bluetooth headset according to claim 8, wherein a magnetic shield is provided between the wound battery and the speaker.
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| CN202110639154.5A CN113381079B (en) | 2021-06-08 | 2021-06-08 | Winding type battery and TWS Bluetooth headset |
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| CN202110639154.5A CN113381079B (en) | 2021-06-08 | 2021-06-08 | Winding type battery and TWS Bluetooth headset |
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| CN212967781U (en) * | 2020-09-16 | 2021-04-13 | Oppo广东移动通信有限公司 | Battery, electroacoustic assembly and audio equipment |
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| JP2014013646A (en) * | 2010-10-20 | 2014-01-23 | Sanyo Electric Co Ltd | Nonaqueous electrolyte secondary battery |
| TWI685996B (en) * | 2018-06-13 | 2020-02-21 | 金碳洁股份有限公司 | Rechargeable battery and electrode thereof |
| US11923511B2 (en) * | 2019-07-12 | 2024-03-05 | Electrochem Solutions, Inc. | Lithium oxyhalide electrochemical cell design for high-rate discharge |
| CN210224197U (en) * | 2019-08-23 | 2020-03-31 | 重庆市紫建电子有限公司 | External welding type winding type button battery |
| CN111370638B (en) * | 2020-05-11 | 2024-01-30 | 福建南平延平区南孚新能源科技有限公司 | Production method of button cell without welding trace and prepared button cell |
| CN111901733B (en) * | 2020-07-28 | 2021-10-12 | 维沃移动通信有限公司 | Electronic device |
| CN213150851U (en) * | 2020-09-16 | 2021-05-07 | 常州微宙电子科技有限公司 | Lithium ion battery capable of reducing electromagnetic radiation |
| CN112582685A (en) * | 2020-11-25 | 2021-03-30 | 广东维都利新能源有限公司 | Soft package lithium ion battery without electromagnetic interference and manufacturing method thereof |
| CN112615039B (en) * | 2020-12-31 | 2022-05-17 | 广东微电新能源有限公司 | Battery cell structure, battery and electronic equipment |
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| CN108258294A (en) * | 2017-12-27 | 2018-07-06 | 深圳瑞隆新能源科技有限公司 | A kind of takeup type battery core, electric core winding method and coiled battery |
| CN212967781U (en) * | 2020-09-16 | 2021-04-13 | Oppo广东移动通信有限公司 | Battery, electroacoustic assembly and audio equipment |
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