Wireless rechargeable battery

Abstract

The utility model discloses a wireless rechargeable battery. The wireless rechargeable battery comprises a battery shell, a battery cell assembly arranged in the battery shell, and a positive pole piece and a negative pole piece which are arranged outside the battery shell, wherein the battery cell assembly comprises a rechargeable battery cell, a bracket and an electromagnetic coil, and the rechargeable battery cell is accommodated in the bracket; and the electromagnetic coil is wound on the outer side of the bracket and is used for converting the received alternating magnetic field into electric energy so as to charge the rechargeable battery cell. Therefore, the induction area of wireless charging of the battery can be increased, the charging efficiency and convenience can be improved, and the rechargeable battery core and the electromagnetic coil in the battery can be better protected, so that the performance stability of the battery can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of wireless charging, and in particular to a wireless charging battery. Background Art

[0002] Wireless charging is a new type of energy transmission method. Nowadays, many electronic devices can support wireless charging, such as mobile phones, smart watches, Bluetooth headsets, electric toothbrushes, etc. In the related technology, for wireless charging batteries on electronic devices that support wireless charging, there are still many problems such as low charging efficiency, inconvenient charging, and poor battery stability. Utility Model Content

[0003] In view of this, an embodiment of the present application provides a wireless charging battery, which can increase the induction area of ​​wireless charging of the battery, improve the efficiency and convenience of charging, and better protect the rechargeable cells and electromagnetic coils inside the battery, thereby improving the performance stability of the battery.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] The present application provides a wireless charging battery, including:

[0006] A battery housing, a battery cell assembly disposed inside the battery housing, and a positive electrode sheet and a negative electrode sheet disposed outside the battery housing; wherein:

[0007] The battery cell assembly comprises a rechargeable battery cell, a bracket and an electromagnetic coil, wherein the rechargeable battery cell is accommodated inside the bracket;

[0008] The electromagnetic coil is wound around the outside of the bracket, and is used to convert the received alternating magnetic field into electrical energy to charge the rechargeable battery cell.

[0009] In some embodiments, the electromagnetic coil is wound in a full circle along the circumferential direction of the rechargeable battery cell.

[0010] In some embodiments, the electromagnetic coil includes at least two electromagnetic sub-coils, and the at least two electromagnetic sub-coils are used to convert the received alternating magnetic field into electrical energy to charge the rechargeable battery cell; wherein, at least two of the electromagnetic sub-coils are connected in series, and the currents generated between adjacent electromagnetic sub-coils flow in opposite directions.

[0011] In some embodiments, the electromagnetic sub-coil is in a runway shape, the distance between adjacent electromagnetic sub-coils in a direction perpendicular to the axis of the rechargeable battery cell is 0.1 mm to 0.3 mm, and the ratio of the length of the electromagnetic sub-coil along the axis of the rechargeable battery cell to the axial length of the rechargeable battery cell is above 90%.

[0012] In some embodiments, the battery cell assembly also includes a charging circuit board, which is arranged on the outside of the bracket, and the charging circuit board includes a first part, a second part and a third part. A accommodating space is formed inside the first part, and the bracket is located in the accommodating space; wherein, the second part and the third part are distributed at both ends of the first part, the second part has a rechargeable battery cell connection point and a first pole piece connection point, the third part has a second pole piece connection point, the electromagnetic coil is arranged on the first part, and the first output end of the electromagnetic coil is arranged on the third part; the rechargeable battery cell connection point is connected to the rechargeable battery cell, one of the first pole piece connection point and the second pole piece connection point is connected to the positive pole piece, and the other is connected to the negative pole piece.

[0013] In some embodiments, the third part includes a first sub-part and a second sub-part that are interconnected, the first sub-part is adapted to the shape of the end of the rechargeable battery cell, and the second pole piece connection point is located at an end of the second sub-part away from the first sub-part; the second part includes a third sub-part and a fourth sub-part that are interconnected, the third sub-part is adapted to the shape of the end of the rechargeable battery cell, the rechargeable battery cell connection point is arranged on the third sub-part, and the first pole piece connection point is located at an end of the fourth sub-part away from the third sub-part.

[0014] In some embodiments, the charging circuit board is an integrally formed flexible circuit board.

[0015] In some embodiments, there is a voltage conversion circuit on the charging circuit board, and the voltage conversion circuit is located in the second part and / or the third part; the voltage conversion circuit has a first input end, a second output end and a third output end; the first input end of the voltage conversion circuit is connected to the first output end of the electromagnetic coil; the second output end of the voltage conversion circuit is connected to the rechargeable battery cell connection point, and the third output end of the voltage conversion circuit is connected to the first pole piece connection point and the second pole piece connection point; the electromagnetic coil is used to convert the received alternating magnetic field into an AC voltage, and output the AC voltage to the voltage conversion circuit; the voltage conversion circuit is used to: convert the received AC voltage into DC to obtain a first DC voltage; step down the first DC voltage to obtain a second DC voltage; provide the first DC voltage to the rechargeable battery cell, and provide the second DC voltage to the first pole piece connection point and the second pole piece connection point.

[0016] In some embodiments, the voltage conversion circuit includes a charging circuit and a buck output circuit; wherein the charging circuit has a second input terminal and a fourth output terminal, and the buck output circuit has a third input terminal and a fifth output terminal; the second input terminal is connected to the first output terminal, and the fourth output terminal is connected to the third input terminal and the rechargeable battery cell; the charging circuit is used to convert the received AC voltage into DC to obtain the first DC voltage, and provide the first DC voltage to the buck output circuit and the rechargeable battery cell; the fifth output terminal is connected to the first pole piece connection point and the second pole piece connection point, and the buck output circuit is used to step down the first DC voltage to obtain the second DC voltage, and provide the second DC voltage to the first pole piece connection point and the second pole piece connection point.

[0017] In some embodiments, the wireless charging battery further includes a magnetic isolation sheet, and the magnetic isolation sheet is disposed between the bracket and the electromagnetic coil.

[0018] In the embodiment of the present application, the wireless charging battery includes: a battery shell, a battery cell assembly arranged inside the battery shell, and a positive electrode sheet and a negative electrode sheet arranged outside the battery shell; wherein the battery cell assembly includes a rechargeable battery cell, a bracket and an electromagnetic coil, and the rechargeable battery cell is accommodated inside the bracket; the electromagnetic coil is wound around the outside of the bracket, and the electromagnetic coil is used to convert the received alternating magnetic field into electrical energy to charge the rechargeable battery cell. In this way, on the one hand, the electromagnetic coil wound around the outside of the bracket can have a larger wireless charging induction area, thereby improving the charging efficiency and convenience of the wireless charging battery. On the other hand, since the battery cell assembly is arranged inside the battery shell, the rechargeable battery cell in the battery cell assembly is accommodated inside the bracket and the electromagnetic coil is wound around the outside of the bracket. In this way, the rechargeable battery cell and the electromagnetic coil in the battery cell assembly can be better protected, thereby improving the performance stability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a wireless charging battery provided in an embodiment of the present application Figure 1 ;

[0020] Figure 2 A schematic diagram of the structure of a wireless charging battery provided in an embodiment of the present application Figure 2 ;

[0021] Figure 3 A schematic diagram of the structure of a wireless charging battery provided in an embodiment of the present application Figure 3 ;

[0022] Figure 4 A schematic diagram of the structure of an electromagnetic coil provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of a wireless charging battery provided in an embodiment of the present application Figure 4 ;

[0024] Figure 6 A schematic diagram of the structure of a charging circuit board provided in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of the structure of a wireless charging battery provided in an embodiment of the present application Figure 5 ;

[0026] Figure 8 A schematic diagram of a circuit structure of a wireless charging battery provided in an embodiment of the present application Figure 1 ;

[0027] Fig. 9 A schematic diagram of a circuit structure of a wireless charging battery provided in an embodiment of the present application Figure 2 ;

[0028] Fig.10 A schematic diagram of a circuit structure of a wireless charging battery provided in an embodiment of the present application Figure 3 ;

[0029] Fig.11 An exploded diagram of the structure of a wireless charging battery provided in an embodiment of the present application;

[0030] Fig.12 A schematic diagram of the structure of a wireless charging battery provided in an embodiment of the present application Figure 6 ;

[0031] Fig.13 A schematic diagram of the structure of a wireless charging battery provided in an embodiment of the present application Figure 7 ;

[0032] Fig.14 A schematic diagram of the structure of a wireless charging battery provided in an embodiment of the present application Figure 8 ;

[0033] Fig.15 A rotation angle / coupling coefficient relationship diagram of a wireless charging battery simulation provided in an embodiment of the present application;

[0034] Fig.16 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0037] The present application embodiment provides a wireless charging battery, such as Figure 1 As shown, the wireless charging battery 10 includes:

[0038] A battery housing 11, a battery cell assembly 12 disposed inside the battery housing 11, and a positive electrode sheet 13 and a negative electrode sheet 14 disposed outside the battery housing 11; wherein,

[0039] The battery cell assembly 12 includes a rechargeable battery cell 121, a bracket 122 and an electromagnetic coil 123, and the rechargeable battery cell 121 is accommodated inside the bracket 122;

[0040] The electromagnetic coil 123 is wound around the outside of the bracket 122 , and the electromagnetic coil 123 is used to convert the received alternating magnetic field into electrical energy to charge the rechargeable battery cell 121 .

[0041] Here, the battery housing 11 is an external structure of the wireless charging battery 10 , and is used to accommodate and protect components inside the wireless charging battery 10 .

[0042] The rechargeable battery cell 121 in the battery cell assembly 12 is the energy storage part of the wireless charging battery 10, which can be charged and discharged multiple times and is used to store and release electrical energy; the bracket 122 in the battery cell assembly 12 is used to fix and support the rechargeable battery cell 121, improve the stability of the rechargeable battery cell 121 in the battery housing 11, and reduce the movement or damage of the rechargeable battery cell 121 inside the wireless charging battery 10.

[0043] The electromagnetic coil 123 is a receiver for receiving an alternating magnetic field during wireless charging, and is a key part of wireless charging. When an external charging device (such as a wireless charging transmitting coil) emits an alternating magnetic field, when the electromagnetic coil 123 is in the alternating magnetic field, the change in the magnetic field will generate an electromotive force inside the electromagnetic coil 123, so that the electromagnetic coil can generate and output electrical energy to charge the rechargeable battery cell 121. It can be understood that since the electromagnetic coil 123 is wrapped around the outside of the bracket 122, and the bracket 122 is arranged inside the battery housing 11, the electromagnetic coil 123 is not easily damaged by external forces. In addition, because the electromagnetic coil 123 is not directly exposed to the outside, it can also be well dustproof and waterproof, so that the reliability of wireless charging using the electromagnetic coil 123 is higher.

[0044] In some embodiments, the electromagnetic coil receives energy through electromagnetic induction and / or magnetic resonance, etc. In this way, the charging efficiency and convenience of wireless charging can be improved.

[0045] In some embodiments, the corresponding wireless charging method can be selected according to the specific application scenario and requirements. For example, the electromagnetic induction method is suitable for short-distance, high-efficiency charging, while the magnetic resonance method is suitable for medium-distance, high-efficiency charging. At the same time, some batteries may combine multiple methods to improve charging efficiency and convenience.

[0046] In some embodiments, Figure 2 The figure shows a schematic diagram of a scenario in which a wireless charging device 20 is used to charge a wireless charging battery 10. During the charging process, taking the wireless charging method of electromagnetic induction as an example, the wireless charging device 20 will send an alternating magnetic field to the wireless charging battery 10. When the wireless charging battery 10 is placed above the wireless charging device 20, the wireless charging battery 10 is charged by obtaining energy from the alternating magnetic field. For example, the wireless charging device 20 includes a wireless transmitting coil, through which an alternating magnetic field can be sent to the wireless charging battery 10, and the electromagnetic coil 123 can receive the alternating magnetic field and convert the received alternating magnetic field into electrical energy to charge the rechargeable battery cell 121.

[0047] In some embodiments, the rechargeable battery cell 121 includes a rechargeable lithium battery cell.

[0048] Here, in the use of wireless charging batteries, wireless charging batteries using rechargeable lithium batteries can be repeatedly charged and used, thereby improving the convenience and economy of use; at the same time, since lithium batteries have a higher energy density, wireless charging batteries using rechargeable lithium batteries can provide a longer battery life to meet the user's usage needs.

[0049] In the embodiment of the present application, the wireless charging battery includes: a battery shell, a battery cell assembly arranged inside the battery shell, and a positive electrode sheet and a negative electrode sheet arranged outside the battery shell; wherein the battery cell assembly includes a rechargeable battery cell, a bracket and an electromagnetic coil, and the rechargeable battery cell is accommodated inside the bracket; the electromagnetic coil is wound around the outside of the bracket, and the electromagnetic coil is used to convert the received alternating magnetic field into electrical energy to charge the rechargeable battery cell. In this way, on the one hand, the electromagnetic coil wound around the outside of the bracket can have a larger wireless charging induction area, thereby improving the charging efficiency and convenience of the wireless charging battery. On the other hand, since the battery cell assembly is arranged inside the battery shell, the rechargeable battery cell in the battery cell assembly is accommodated inside the bracket and the electromagnetic coil is wound around the outside of the bracket. In this way, the rechargeable battery cell and the electromagnetic coil in the battery cell assembly can be better protected, thereby improving the performance stability of the battery.

[0050] In some embodiments, Figure 3 As shown, the electromagnetic coil 123 is wound in a full circle along the circumferential direction of the rechargeable battery core 121.

[0051] It can be understood that since the electromagnetic coil is wound around the outside of the bracket in a full circle along the circumferential direction of the rechargeable battery cell, the electromagnetic coil can have a larger receiving area to receive the energy transmitted by the wireless charging device, so that more energy can be transmitted from the wireless charging device to the battery cell, reducing energy loss during transmission, thereby improving the overall energy transmission efficiency, and the wireless charging battery can also be charged more flexibly.

[0052] In some embodiments, a plurality of electromagnetic sub-coils connected in series may be used to convert the received alternating magnetic field into an alternating voltage.

[0053] Here, each electromagnetic sub-coil can independently convert the received magnetic field energy into an AC voltage. When these electromagnetic sub-coils are connected in series, it means that the output ends of multiple electromagnetic sub-coils are connected in sequence to form a single electrical path. This connection method has several important technical effects:

[0054] Improve energy transfer efficiency: By properly designing the number of turns, size, and arrangement of the electromagnetic sub-coils, the coils connected in series can more efficiently receive and convert energy in the alternating magnetic field. This configuration helps reduce energy loss, improves overall energy transfer efficiency, and makes the wireless charging process more efficient;

[0055] Voltage superposition: Since the output ends of the electromagnetic sub-coils are connected in series, the AC voltage generated by each coil is superimposed, which results in an increase in the overall output voltage, thereby increasing the voltage level of energy transfer; this is particularly important for charging devices or batteries with high voltage requirements, as a single coil may not be able to generate enough voltage to meet charging needs;

[0056] Current Sharing: In a series circuit, the current is uniform, so the current through each electromagnetic sub-coil is equal; this means that each coil shares the same current load, reducing the stress on a single coil. This distributed current load helps extend the life of the coil and reduces potential problems such as overheating.

[0057] Simplified circuit design: The series connection method is relatively simple and does not require complex parallel or mixed circuit structures. It reduces the number of components required in the circuit, thereby reducing manufacturing costs and complexity. In addition, the analysis and design of series circuits are relatively intuitive, making it easier for engineers to optimize performance and troubleshoot.

[0058] It can be understood that according to Faraday's law, as long as the magnetic flux passing through a closed circuit changes, an induced current will be generated in the closed circuit. Therefore, at each angle of rotation of two or more electromagnetic sub-coils in series, one of the electromagnetic sub-coils must be able to cut the magnetic field better. In this way, the alternating magnetic field can better pass through the closed loop formed by the electromagnetic sub-coils, greatly increasing the wireless charging induction area of ​​the wireless charging battery, and realizing that the wireless charging battery can be charged at a rotation angle of nearly 360 degrees, thereby improving the charging efficiency and convenience of charging the wireless charging battery.

[0059] In an embodiment of the present application, when the electromagnetic coil includes at least two electromagnetic sub-coils and these coils are connected in series, technical effects such as improving energy transmission efficiency, voltage superposition, current sharing and simplifying circuit design can be achieved, thereby effectively improving the performance and reliability of the wireless charging battery.

[0060] In some embodiments, Figure 4 As shown, the electromagnetic coil 123 includes at least two electromagnetic sub-coils ( Figure 4 The electromagnetic sub-coil 123a and the electromagnetic sub-coil 123b are exemplarily shown in the figure, and at least two electromagnetic sub-coils are used to convert the received alternating magnetic field into electrical energy to charge the rechargeable battery cell 121; wherein at least two electromagnetic sub-coils are connected in series, and the currents generated between adjacent electromagnetic sub-coils flow in opposite directions.

[0061] For example, see Figure 4 The electromagnetic sub-coil 123a and the electromagnetic sub-coil 123b are adjacent to each other and are connected in series, and the current generated between the electromagnetic sub-coil 123a and the electromagnetic sub-coil 123b flows in opposite directions.

[0062] In the above embodiment, since at least two electromagnetic sub-coils of the electromagnetic coil are connected in series, and the currents generated between adjacent electromagnetic sub-coils flow in opposite directions, the electromotive force generated inside the electromagnetic coil as a whole can be enhanced, thereby further improving the charging efficiency of the wireless charging battery. In addition, the electromagnetic coil is wound in a full circle along the circumferential direction of the rechargeable battery cell, so that the wireless charging battery can be charged at any rotation angle (i.e., 360-degree charging), thereby further improving the charging efficiency and convenience of the wireless charging battery.

[0063] In some embodiments, see Figure 4The electromagnetic sub-coils (such as electromagnetic sub-coils 123a and electromagnetic sub-coils 123b) are in a runway shape, the distance between adjacent electromagnetic sub-coils in the direction perpendicular to the axial direction of the rechargeable battery cell 121 is 0.1mm to 0.3mm, and the ratio of the length of the electromagnetic sub-coil along the axial direction of the rechargeable battery cell 121 to the axial length of the rechargeable battery cell 121 is more than 90%. In this way, the induction area of ​​the alternating magnetic field during the wireless charging process can be further increased, thereby further improving the charging efficiency of the wireless charging battery.

[0064] It can be understood that the electromagnetic coil 123 is wound as a whole along the circumferential direction of the rechargeable battery cell 121, and the distance between adjacent electromagnetic sub-coils in the direction perpendicular to the axial direction of the rechargeable battery cell 121 is the distance between adjacent electromagnetic sub-coils in the circumferential direction of the rechargeable battery cell 121.

[0065] In some embodiments, the ratio of the length of the electromagnetic sub-coil along the axial direction of the rechargeable battery cell 121 to the axial length of the rechargeable battery cell 121 is 100%. In this way, the induction area of ​​the alternating magnetic field during wireless charging can cover the entire side of the rechargeable battery cell 121, thereby further improving the charging efficiency of the wireless charging battery.

[0066] In some embodiments, Figure 5 As shown, the battery cell assembly 12 further includes a charging circuit board 124, and the charging circuit board 124 is arranged outside the bracket 122; Figure 6 As shown, the charging circuit board 124 includes a first part 1241, a second part 1242 and a third part 1243. The first part 1241 forms an accommodation space inside, and the bracket 122 is located in the accommodation space;

[0067] The second part 1242 and the third part 1243 are distributed at both ends of the first part 1241, the second part 1242 has a rechargeable battery core connection point P1 and a first pole piece connection point P2, the third part 1243 has a second pole piece connection point P3, the electromagnetic coil 123 is arranged on the first part 1241, and the first output end O1 of the electromagnetic coil 123 is arranged on the third part 1243;

[0068] The rechargeable cell connection point P1 is connected to the rechargeable cell 121 , one of the first pole piece connection point P2 and the second pole piece connection point P3 is connected to the positive pole piece 13 , and the other is connected to the negative pole piece 14 .

[0069] Here, the charging circuit board 123 can be used to receive the AC voltage output by the electromagnetic coil 123, and convert the received AC voltage into a DC voltage, and output the converted DC voltage to the rechargeable battery cell connection point P1, the first pole piece connection point P2 and / or the second pole piece connection point P3. For example, the charging circuit board 123 can output the converted first DC voltage to the rechargeable battery cell 121 through the rechargeable battery cell connection point P1 to charge the rechargeable battery cell 121. For another example, the charging circuit board 123 can output the converted second DC voltage to an external device through the first pole piece connection point P2 and the second pole piece connection point P3 to supply power to the external device.

[0070] It can be understood that the first portion 1241 is curled and wrapped around the outside of the bracket 122, and a receiving space is formed inside the curled first portion 1241. The bracket 122 is located in the receiving space, and the rechargeable battery cell 121 is accommodated inside the bracket 122. In this way, multiple protections can be formed for the rechargeable battery cell 121, thereby further improving the safety and stability of the rechargeable battery cell and reducing the volume of the wireless charging battery.

[0071] In some embodiments, the rechargeable cell connection point P1 , the first pole piece connection point P2 , and the first output end O1 of the electromagnetic coil 123 are all disposed on the second portion 1242 , and the second pole piece connection point P3 is disposed on the third portion 1243 .

[0072] In some embodiments, the first pole piece connection point P2 and the first output end O1 of the electromagnetic coil 123 are disposed on the second portion 1242 , and the rechargeable cell connection point P1 and the second pole piece connection point P3 are disposed on the third portion 1243 .

[0073] In some embodiments, the first pole piece connection point P2 is disposed on the second portion 1242 , and the rechargeable cell connection point P1 , the second pole piece connection point P3 , and the first output end O1 of the electromagnetic coil 123 are disposed on the third portion 1243 .

[0074] In some embodiments, see Figure 6 The third part 1243 includes a first sub-part 12431 and a second sub-part 12432 connected to each other, the first sub-part 12431 is adapted to the shape of the end of the rechargeable battery cell 121, and the second pole piece connection point P3 is located at an end of the second sub-part 12432 away from the first sub-part 12431;

[0075] The second part 1242 includes a third sub-part 12421 and a fourth sub-part 12422 which are interconnected. The third sub-part 12421 is adapted to the shape of the end of the rechargeable battery cell 121. The rechargeable battery cell connection point P1 is arranged on the third sub-part 12421. The first pole piece connection point P2 is located at an end of the fourth sub-part 12422 away from the third sub-part 12421.

[0076] In some embodiments, the shape of the end of the rechargeable battery cell 121 is circular, and the shapes of the first sub-portion 12431 and the third sub-portion 12421 may both be circular.

[0077] In some embodiments, the shape of the end of the rechargeable battery cell 121 is square, and the shapes of the first sub-portion 12431 and the third sub-portion 12421 may both be square.

[0078] In some embodiments, the shapes of the two ends of the rechargeable battery cell 121 are different, and the shape of the first sub-portion 12431 can be respectively adapted to the shape of the end portion of the rechargeable battery cell 121 close to the first sub-portion 12431, and the shape of the third sub-portion 12421 can be respectively adapted to the shape of the end portion of the two ends of the rechargeable battery cell 121 close to the third sub-portion 12421.

[0079] The shapes of the second sub-portion 12432 and the fourth sub-portion 12422 can be set according to actual conditions, and the embodiment of the present application is not limited to this.

[0080] In some embodiments, the second sub-portion 12432 and the fourth sub-portion 12422 may both be in the shape of elongated strips.

[0081] In some embodiments, see Figure 6 and Figure 7 The charging circuit board 124 is an integrally formed flexible circuit board.

[0082] In this way, the design and production process of the wireless charging battery can be simplified, the production cost can be reduced, and the stability of the wireless charging battery can be improved.

[0083] In some embodiments, the base material of the charging circuit board 124 includes polyesterimide and / or polyester film.

[0084] It is understandable that the base material of the charging circuit board 124 can be selected from polyesterimide and / or polyester film, mainly because polyesterimide and polyester film have excellent electrical and mechanical properties, for example, both have good insulation properties, excellent heat resistance, good mechanical strength, and easy processing and manufacturing.

[0085] In the embodiment of the present application, polyesterimide and / or polyester film are selected as the base material of the charging circuit board, which can improve the electrical safety, stability, heat resistance and mechanical strength of the electromagnetic coil, and facilitate processing and manufacturing, thereby helping to improve the overall performance and service life of the charging circuit board, and further improve the reliability and performance of the wireless charging battery.

[0086] In some embodiments, a voltage conversion circuit is provided on the charging circuit board 124 , and the voltage conversion circuit is located in the second portion 1242 and / or the third portion 1243 .

[0087] See also Figure 8 , the voltage conversion circuit 125 has a first input terminal I1, a second output terminal O2 and a third output terminal O3; the first input terminal I1 of the voltage conversion circuit 125 is connected to the first output terminal O1 of the electromagnetic coil 123; the second output terminal O2 of the voltage conversion circuit 125 is connected to the rechargeable battery cell connection point P1, and the third output terminal O3 of the voltage conversion circuit 125 is connected to the first pole piece connection point P2 and the second pole piece connection point P3; the electromagnetic coil 123 is used to convert the received alternating magnetic field into an alternating voltage, and output the alternating voltage to the voltage conversion circuit 125;

[0088] The voltage conversion circuit 125 is used to: convert the received AC voltage into DC to obtain a first DC voltage; step down the first DC voltage to obtain a second DC voltage; provide the first DC voltage to the rechargeable battery cell 121, and provide the second DC voltage to the first pole piece connection point P2 and the second pole piece connection point P3.

[0089] The voltage conversion circuit 125 can provide a first DC voltage to the rechargeable battery cell 121 through the rechargeable battery cell connection point P1, and provide a second DC voltage to the positive electrode plate 13 and the negative electrode plate 14 through the first electrode plate connection point P2 and the second electrode plate connection point P3.

[0090] It is understandable that the second DC voltage obtained by stepping down the first DC voltage can be adapted to the voltage required by the external device.

[0091] In some embodiments, when the rechargeable battery cell 121 is charged by the electromagnetic coil 123 , the voltage conversion circuit 125 may provide a first DC voltage to the rechargeable battery cell 121 .

[0092] In some embodiments, when the electromagnetic coil 123 is used to power an external device, the voltage conversion circuit 125 can provide a second DC voltage to the positive electrode plate 13 and the negative electrode plate 14 .

[0093] In some embodiments, when the rechargeable battery cell 121 is used to power an external device, the rechargeable battery cell 121 can be used to output a third DC voltage to the voltage conversion circuit 125, and the voltage conversion circuit 125 steps down the third DC voltage to obtain a fourth DC voltage, and provides the fourth DC voltage to the positive electrode sheet 13 and the negative electrode sheet 14 through the first electrode sheet connection point P2 and the second electrode sheet connection point P3. The fourth DC voltage can have the same voltage value as the second DC voltage.

[0094] In some implementations, the voltage value of the second DC voltage may be 1.5V.

[0095] In some embodiments, see Fig. 9 , the voltage conversion circuit 125 includes a charging circuit 1251 and a buck output circuit 1252; wherein the charging circuit 1251 has a second input terminal I2 and a fourth output terminal O4, and the buck output circuit 1252 has a third input terminal I3 and a fifth output terminal O5; the second input terminal I2 is connected to the first output terminal O1, and the fourth output terminal O4 is connected to the third input terminal I3 and the rechargeable battery cell 121; the charging circuit 1251 is used to convert the received AC voltage into DC to obtain a first DC voltage, and provide the first DC voltage to the buck output circuit 1252 and the rechargeable battery cell 121;

[0096] The fifth output terminal O5 is connected to the first pole piece connection point P2 and the second pole piece connection point P3. The buck output circuit 1252 is used to buck the first DC voltage to obtain a second DC voltage and provide the second DC voltage to the first pole piece connection point P2 and the second pole piece connection point P3.

[0097] Here, the charging circuit 1251 can provide a first DC voltage to the rechargeable battery cell 121 through the rechargeable battery cell connection point P1, and the step-down output circuit 1252 can provide a second DC voltage to the positive electrode plate 13 and the negative electrode plate 14 through the first electrode plate connection point P2 and the second electrode plate connection point P3.

[0098] In the embodiment of the present application, the charging circuit can provide a stable DC voltage to charge the rechargeable battery cell, thereby improving the safety and stability of the battery cell charging and extending the battery life. The DC voltage is stepped down and output by the step-down output circuit, making the energy transmission between the wireless charging battery and the external device more efficient, reducing energy loss and improving the charging efficiency.

[0099] In some embodiments, see Fig.10 The charging circuit 1251 includes a resonant matching component 1251A, a rectifying and filtering component 1251B, and a charging control component 1251C; wherein,

[0100] The resonant matching component 1251A has a fourth input terminal I4 and a sixth output terminal O6, the rectifying and filtering component 1251B has a fifth input terminal I5 and a seventh output terminal O7, and the charging control component 1251C has a sixth input terminal I6 and an eighth output terminal O8; the fourth input terminal I4 is connected to the first output terminal O1, and the sixth output terminal O6 is connected to the fifth input terminal I5. The resonant matching component 1251A is used to adjust the impedance value of the electromagnetic coil 123 so that the electromagnetic coil 123 can better match the wireless charging transmitting coil, thereby enabling the electromagnetic coil 123 to better receive magnetic field energy, thereby helping to optimize the voltage transmission efficiency;

[0101] The seventh output terminal O7 is connected to the sixth input terminal I6, and the rectifying and filtering component 1251B is used to rectify and filter the received AC voltage to obtain a first DC voltage and send it to the charging control component 1251C;

[0102] The eighth output terminal O8 is connected to the rechargeable battery cell 121 and the third input terminal I3 . The charging control component 1251C is used to provide a first DC voltage to the step-down output circuit 1252 and the rechargeable battery cell 121 .

[0103] Here, the charging circuit 1251 includes a resonant matching component 1251A, a rectifying and filtering component 1251B, and a charging control component 1251C, wherein:

[0104] In the resonant matching component 1251A, the fourth input terminal I4 is connected to the first output terminal O1 of the electromagnetic coil 123 to receive the AC voltage sent by the electromagnetic coil 123; the resonant matching component 1251A is used to adjust the impedance value of the electromagnetic coil 123, which helps to optimize the voltage transmission efficiency and ensure the matching between the electromagnetic coil 123 and the charging circuit 1251.

[0105] In the rectification and filtering component 1251B, the fifth input terminal I5 is connected to the sixth output terminal O6 of the resonant matching component 1251A to receive the adjusted AC voltage; the seventh output terminal O7 is connected to the sixth input terminal I6 of the charging control component 1251C to transmit the first DC voltage to the charging control component 1251C; the rectification and filtering component 1251C is responsible for rectifying and filtering the received AC voltage. Rectification is to convert the AC voltage into a DC voltage, and filtering is to remove clutter and noise in the voltage to obtain a DC voltage with higher quality.

[0106] In the charging control component 1251C, the sixth input terminal I6 is connected to the seventh output terminal O7 of the rectifier filter component 1251B to receive the first DC voltage; the eighth output terminal O8 is connected to the rechargeable battery cell 121 on the one hand to provide the first DC voltage for charging the rechargeable battery cell 121, and is connected to the third input terminal I3 of the buck output circuit 1252 on the other hand to transmit the first DC voltage to the buck output circuit 1252; the charging control component 1251C is responsible for providing the first DC voltage to the buck output circuit 1252 and the rechargeable battery cell 121. In some embodiments, the charging control component 1251C may also include some control logic, such as voltage monitoring, and / or charging current control, etc., to ensure the safety and efficiency of charging the rechargeable battery cell 121.

[0107] In some embodiments, the charging control component 1251C can be a switching charging component or a linear charging component.

[0108] It can be understood that the fourth input terminal I4 of the resonant matching component 1251A serves as the second input terminal I2 of the charging circuit 1251 ; and the eighth output terminal O8 of the charging control component 1251C serves as the fourth output terminal O4 of the charging circuit 1251 .

[0109] In the embodiment of the present application, the charging circuit converts the AC voltage received by the electromagnetic coil into a first DC voltage suitable for charging the rechargeable battery cell, ensures the stability and purity of the first DC voltage, and provides the first DC voltage to the step-down output circuit and the rechargeable battery cell through the coordinated work of the resonant matching component, the rectifier and filter component, and the charging control component. In this way, the receiving efficiency of the electromagnetic coil can be optimized through the resonant matching component, so that more energy can be received, and the rectifier and filter component can improve the stability of the output first DC voltage, which helps to reduce damage to the battery during the charging process and improves the safety of charging. In addition, the charging control component can adjust the charging strategy according to the charging state of the battery, which helps to maximize the charging efficiency and reduce the overcharging or over-discharging of the wireless charging battery, thereby improving the service life and safety of the wireless charging battery. In summary, such a design helps to improve the charging efficiency and safety of the wireless charging battery.

[0110] In some embodiments, the wireless charging battery further includes a magnetic isolation sheet, and the magnetic isolation sheet is disposed between the bracket and the electromagnetic coil.

[0111] In some embodiments, Fig.11 , Fig.12 and Fig.13As shown, the wireless charging battery 10 may include a battery housing 11, an electromagnetic coil 123, a magnetic isolation sheet 15, a bracket 122, a rechargeable battery cell 121, and a positive pole piece 13 and a negative pole piece 14. The magnetic isolation sheet 15 may be disposed between the bracket 122 and the electromagnetic coil 123. In this way, the electromagnetic interference of the electromagnetic coil 123 to the rechargeable battery cell 121 in the bracket 122 may be reduced, thereby enhancing the efficiency of wireless charging.

[0112] The following is a detailed description of an application example. Currently, most electronic devices, such as remote controls, mice, and other electronic devices, do not have wireless charging functions. These electronic devices can only use disposable batteries or rechargeable batteries. When using rechargeable batteries, they need to bring a matching dedicated charger, which is very inconvenient. In addition, for other electronic devices containing wireless charging batteries, basically only one side of the wireless charging battery can realize the wireless charging function, which also restricts the user's convenient use.

[0113] In view of this, this application exemplifies a proposed wireless charging battery 10, Fig.14 is a schematic diagram of the structure of the wireless charging battery 10, as shown in Fig.14 As shown, the wireless charging battery 10 includes: a battery housing 11 , a battery cell assembly 12 disposed inside the battery housing 11 , and a positive electrode sheet 13 and a negative electrode sheet 14 disposed outside the battery housing 11 .

[0114] The structure of each part is described in detail below.

[0115] The battery cell assembly 12 includes a rechargeable battery cell 121, a bracket 122, an electromagnetic coil 123, a charging circuit board 125 and a magnetic isolation sheet 15. The rechargeable battery cell 121 is accommodated in the bracket 122, and the magnetic isolation sheet 15 is arranged between the bracket 122 and the electromagnetic coil 131;

[0116] The electromagnetic coil 123 is wound around the outside of the bracket 122 in a winding manner of a full circle along the circumferential direction of the rechargeable battery cell 121; the electromagnetic coil 123 includes at least two electromagnetic sub-coils, and the at least two electromagnetic sub-coils are used to convert the received alternating magnetic field into electrical energy to charge the rechargeable battery cell 121; wherein, at least two electromagnetic sub-coils are connected in series, and the currents generated between adjacent electromagnetic sub-coils flow in opposite directions; the electromagnetic sub-coils are in a runway shape, and the distance between adjacent electromagnetic sub-coils in a direction perpendicular to the axial direction of the rechargeable battery cell 121 is 0.1 mm to 0.3 mm, and the ratio of the length of the electromagnetic sub-coil along the axial direction of the rechargeable battery cell 121 to the axial length of the rechargeable battery cell 121 is greater than 90%;

[0117] The charging circuit board 124 is arranged on the outside of the bracket 122. The charging circuit board 124 includes a first part, a second part and a third part. A storage space is formed inside the first part, and the bracket 122 is located in the storage space; the second part and the third part are distributed at both ends of the first part, the second part has a rechargeable battery cell connection point and a first pole piece connection point, and the third part has a second pole piece connection point. The electromagnetic coil 123 is arranged on the first part, and the first output end of the electromagnetic coil 123 is arranged on the third part; the rechargeable battery cell connection point is connected to the rechargeable battery cell 121, one of the first pole piece connection point and the second pole piece connection point is connected to the positive pole piece 13, and the other is connected to the negative pole piece 14; there is a voltage conversion circuit 125 on the charging circuit board 124, and the voltage conversion circuit 12 5 is located in the second part and / or the third part; the voltage conversion circuit 125 includes a charging circuit and a buck output circuit; wherein the charging circuit has a second input terminal and a fourth output terminal, and the buck output circuit has a third input terminal and a fifth output terminal; the second input terminal is connected to the first output terminal, and the fourth output terminal is connected to the third input terminal and the rechargeable battery cell 121; the charging circuit is used to convert the received AC voltage into DC to obtain a first DC voltage, and provide the first DC voltage to the buck output circuit and the rechargeable battery cell 121; the fifth output terminal is connected to the first pole piece connection point and the second pole piece connection point, and the buck output circuit is used to step down the first DC voltage to obtain a second DC voltage, and provide the second DC voltage to the first pole piece connection point and the second pole piece connection point.

[0118] In this way, the wireless charging battery 10 of this application example, by setting the electromagnetic coil 123 and the voltage conversion circuit 125 on the charging circuit board 124, when the electromagnetic coil 123 is in an alternating magnetic field, the change in the magnetic field will generate an electromotive force inside the electromagnetic coil 123, thereby generating an AC voltage, and the voltage conversion circuit 125 can convert and step down the AC voltage output by the electromagnetic coil 123, thereby realizing an integrated design of wireless charging reception and step-down output, and can realize the wireless charging function in electronic devices at a low cost, reduce the size of electronic devices, shorten the research and development cycle of electronic devices, and have a wide range of applicable scenarios; in addition, through the above-mentioned structure of the wireless charging battery 10, the electromagnetic coil 123 wrapped around the outside of the bracket 122 can have a larger wireless charging induction area, thereby improving the charging efficiency and convenience of charging the wireless charging battery 10.

[0119] For example, when the wireless transmitting coil is used to charge the rechargeable battery cell 121 in the wireless charging battery 10, Fig.15 The figure is a relationship diagram of the rotation angle / coupling coefficient between the electromagnetic coil and the wireless transmitting coil simulated by the simulation software during the process of the wireless charging battery 10 rotating 360 degrees on the wireless transmitting coil; Fig.15As shown, the horizontal axis represents the rotation angle, the unit is degree (deg), and the vertical axis represents the coupling coefficient (CplCoef). It can be seen from the simulation results that only a very small part has a coupling coefficient close to 0, that is, the wireless charging battery provided in the embodiment of the present application can achieve nearly 360-degree charging.

[0120] In addition, an embodiment of the present application provides an electronic device, such as Fig.16 As shown, the electronic device 30 includes the wireless charging battery 10 provided in the above embodiment.

[0121] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A wireless charging battery, characterized in that: include: A battery housing, a battery cell assembly disposed inside the battery housing, and a positive electrode sheet and a negative electrode sheet disposed outside the battery housing; wherein, The battery cell assembly comprises a rechargeable battery cell, a bracket and an electromagnetic coil, wherein the rechargeable battery cell is accommodated inside the bracket; The electromagnetic coil is wound around the outside of the bracket, and is used to convert the received alternating magnetic field into electrical energy to charge the rechargeable battery cell.

2. The wireless charging battery according to claim 1, characterized in that: The electromagnetic coil is wound in a complete circle along the circumferential direction of the rechargeable battery core.

3. The wireless charging battery according to claim 2, characterized in that: The electromagnetic coil includes at least two electromagnetic sub-coils, and the at least two electromagnetic sub-coils are used to convert the received alternating magnetic field into electrical energy to charge the rechargeable battery cell; wherein, at least two of the electromagnetic sub-coils are connected in series, and the currents generated between adjacent electromagnetic sub-coils flow in opposite directions.

4. The wireless charging battery according to claim 3, characterized in that: The electromagnetic sub-coil is in a runway shape, the distance between adjacent electromagnetic sub-coils in a direction perpendicular to the axis of the rechargeable battery core is 0.1mm-0.3mm, and the ratio of the length of the electromagnetic sub-coil along the axis of the rechargeable battery core to the axial length of the rechargeable battery core is above 90%.

5. The wireless charging battery according to claim 1, characterized in that: The battery cell assembly also includes a charging circuit board, which is arranged outside the bracket. The charging circuit board includes a first part, a second part and a third part. A receiving space is formed inside the first part, and the bracket is located in the receiving space; wherein, The second part and the third part are distributed at two ends of the first part, the second part has a rechargeable battery core connection point and a first pole piece connection point, the third part has a second pole piece connection point, the electromagnetic coil is arranged on the first part, and the first output end of the electromagnetic coil is arranged on the third part; The rechargeable battery cell connection point is connected to the rechargeable battery cell, one of the first pole piece connection point and the second pole piece connection point is connected to the positive pole piece, and the other is connected to the negative pole piece.

6. The wireless charging battery according to claim 5, characterized in that: The third part includes a first sub-part and a second sub-part connected to each other, the first sub-part is adapted to the shape of the end of the rechargeable battery cell, and the second pole piece connection point is located at an end of the second sub-part away from the first sub-part; The second part includes a third sub-part and a fourth sub-part which are interconnected, the third sub-part is adapted to the shape of the end of the rechargeable battery cell, the rechargeable battery cell connection point is arranged on the third sub-part, and the first pole piece connection point is located at an end of the fourth sub-part away from the third sub-part.

7. The wireless charging battery according to claim 6, characterized in that: The charging circuit board is an integrally formed flexible circuit board.

8. The wireless charging battery according to claim 5, characterized in that: The charging circuit board has a voltage conversion circuit, and the voltage conversion circuit is located in the second part and / or the third part; The voltage conversion circuit has a first input terminal, a second output terminal and a third output terminal; The first input terminal of the voltage conversion circuit is connected to the first output terminal of the electromagnetic coil; The second output end of the voltage conversion circuit is connected to the rechargeable battery cell connection point, and the third output end of the voltage conversion circuit is connected to the first pole piece connection point and the second pole piece connection point; The electromagnetic coil is used to convert the received alternating magnetic field into an alternating voltage, and output the alternating voltage to the voltage conversion circuit; The voltage conversion circuit is used to: convert the received AC voltage into DC to obtain a first DC voltage; step down the first DC voltage to obtain a second DC voltage; provide the first DC voltage to the rechargeable battery cell, and provide the second DC voltage to the first pole piece connection point and the second pole piece connection point.

9. The wireless charging battery according to claim 8, characterized in that: The voltage conversion circuit includes a charging circuit and a step-down output circuit; wherein, The charging circuit has a second input terminal and a fourth output terminal, and the buck output circuit has a third input terminal and a fifth output terminal; the second input terminal is connected to the first output terminal, and the fourth output terminal is connected to the third input terminal and the rechargeable battery cell; the charging circuit is used to convert the received AC voltage into DC to obtain the first DC voltage, and provide the first DC voltage to the buck output circuit and the rechargeable battery cell; The fifth output terminal is connected to the first pole piece connection point and the second pole piece connection point, and the step-down output circuit is used to step down the first DC voltage to obtain the second DC voltage, and provide the second DC voltage to the first pole piece connection point and the second pole piece connection point.

10. The wireless charging battery according to any one of claims 1 to 9, characterized in that: The wireless charging battery further includes a magnetic isolation sheet, and the magnetic isolation sheet is arranged between the bracket and the electromagnetic coil.

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