A battery-connected circuit board, a battery assembly, and an electronic device are provided. The battery-connected circuit board includes a substrate. The substrate is an insulator, and the substrate includes a first area part and a second area part. First conductive layers are disposed on surfaces on both sides of the first area part. A second conductive layer is disposed on a surface on one side of the second area part. The second conductive layer is electrically connected to one of the first conductive layers that is on a same side as the second conductive layer.

TECHNICAL FIELD

This application relates to the field of terminal technologies, and in particular to a battery-connected circuit board, a battery assembly, and an electronic device.

BACKGROUND

An existing circuit board has a thickness. When the circuit board matches a battery, a thickness of a device is increased, which does not facilitate an increase of a battery capacity and reduction of an entire thickness of the device.

SUMMARY

Embodiments of this application are intended to provide a battery-connected circuit board, a battery assembly, and an electronic device.

According to a first aspect, an embodiment of this application provides a battery-connected board. The battery-connected board includes:a substrate, where the substrate is an insulator, the substrate includes a first area part and a second area part, first conductive layers are disposed on surfaces on both sides of the first area part, a second conductive layer is disposed on a surface on one side of the second area part, and the second conductive layer is electrically connected to a first conductive layer, on a same side, of the first conductive layers.

A first cover film is disposed on one side, away from the substrate, of the first conductive layer. A second cover film is disposed on one side, away from the substrate, of the second conductive layer. The first cover film and the second cover film are insulating material films.

The first area part is provided with a through hole. A conductive connector is disposed in the through hole. The conductive connector is separately connected to the first conductive layers on the surfaces on both sides of the first area part.

A first base layer is disposed between the substrate and the first conductive layer, and the first base layer is a conductive material layer.

A second base layer is disposed between the substrate and the second conductive layer, and the second base layer is a conductive material layer.

Materials and/or thicknesses of the first base layer and the second base layer are the same.

Materials and/or thicknesses of the first conductive layer and the second conductive layer are the same;the first conductive layer and the second conductive layer are metal material layers: orthe battery-connected circuit board is a flexible circuit board.

According to a second aspect, an embodiment of this application provides a battery assembly. The battery assembly includes:the battery-connected circuit board in the foregoing embodiment; anda cell structure, where an edge of the cell structure is provided with a sink, a first conductive layer, close to the cell structure, of the first conductive layers is located in the sink, a surface on the other side of the second area part of the substrate abuts against a surface on one side of the cell structure, and first conductive layers on surfaces on both sides of the first area. part are both electrically connected to a charging electrode of the cell structure.

The battery assembly further includes:a motherboard, where the cell structure is disposed on one side of the motherboard, and the battery-connected circuit board is disposed on one side, away from the motherboard, of the cell structure.

The first conductive layer is electrically connected to the motherboard, and the second conductive layer is electrically connected to the motherboard.

The battery assembly further includes:a charging board, where the charging board is disposed on the motherboard, the charging board is electrically connected to the motherboard, and the charging board is electrically connected to the charging electrode of the cell structure.

A first connection part and a second connection part are disposed on the motherboard, the cell structure is disposed between the first connection part and the second connection part, the second conductive layer is electrically connected to the first connection part, one end of the charging board is electrically connected to the charging electrode of the cell structure, and the other end of the charging board is electrically connected to the second connection part.

According to a third aspect, an embodiment of this application provides an electronic device. The electronic device includes the battery assembly in the foregoing embodiment.

A battery-connected circuit board according to this embodiment of this application includes: a substrate, where the substrate is an insulator, the substrate includes a first area part and a second area part, first conductive layers are disposed on surfaces on both sides of the first area part, a second conductive layer is disposed on a surface on one side of the second area part, and the second conductive layer is electrically connected to a first conductive layer, on a same side, of the first conductive lavers. In the battery-connected circuit board of this application, the first conductive layers are disposed on surfaces on both sides of the first area part, the second conductive layer is disposed on a surface on one side of the second area part, the second conductive layer is electrically connected to the first conductive layer, on a same side, of the first conductive layers, and no second conductive layer is disposed on a surface on the other side of the second area part. When the circuit board matches a battery, the surface on the other side of the second area part may abut against a surface on one side of the battery, to reduce an overall thickness of the circuit board and the battery. This helps to increase a capacity of the battery, and helps to reduce an overall thickness of the device. A first conductive layer, on one side close to the cell structure, in the first area part is located in the sink, which does not cause an increase of the overall thickness.

DETAILED DESCRIPTION

The terms “first”, “second”, and the like in this specification and claims of this application are used to distinguish between similar objects instead of describing a specific order or sequence. It should be understood that data used in this way may be interchangeable in appropriate cases, so that the embodiments of this application can be implemented in a sequence other than those shown or described herein. In addition, in this specification and the claims, “and/or” represents at least one of connected objects, and a character “/” generally represents an “or” relationship between associated objects.

With reference toFIG.1toFIG.7, a battery-connected circuit board provided in embodiments of this application is described in detail by using embodiments and application scenarios for the embodiments.

FIG.1is a battery-connected circuit board according to an embodiment of this application. The battery-connected circuit board includes a substrate10. The substrate10is an insulator. For example, the substrate10is a plastic board. The substrate10includes a first area part and a second area part. An edge of the first area part may be in direct contact with and connected to an edge of the second area part. First conductive layers11are disposed on surfaces on both sides of the first area part, and a second conductive layer12is disposed on a surface on one side of the second area part. The second conductive layer12is electrically connected to a. first conductive layer11, on a same side, of the first conductive layers11. An edge of the second conductive layer12may be directly connected to an edge of the first conductive layer11on a same side. The first conductive layers11on surfaces on both sides of the first area part may be electrically connected.

In the battery-connected circuit board of this application, the first conductive layers11are disposed on surfaces on both sides of the first area part of the substrate10, the second conductive layer12is disposed on a surface on one side of the second area part, the second conductive layer12is electrically connected to the first conductive layer11, on a same side, of the first conductive layers11, and no second conductive layer12is disposed on a surface on the other side of the second area part. When the circuit board matches a battery, the surface on the other side of the second area part may abut against a surface on one side of the battery, to reduce an overall thickness of the circuit board and the battery. This helps to increase a capacity of the battery, and helps to reduce an overall thickness of the device. A first conductive layer11, on one side close to the cell structure, in the first area part is located in the sink, which does not cause an increase of the overall thickness.

As shown inFIG.1, in some embodiments, a first cover film13is disposed on one side, away from the substrate10, of the first conductive layer11. The first conductive layer11may be protected by using the first cover film13, to prevent the first conductive layer11from being damaged. A second cover film14is disposed on one side, away from the substrate10, of the second conductive layer12. The first cover film13and the second cover film14are insulating material films. The second conductive layer12may be protected by using the second cover film14, to prevent the second conductive layer12from being damaged. The first cover film13may be an insulating resin material, such as polyimide. The first cover film13may be bonded to the first conductive layer11by using a first adhesive layer17, and the first adhesive layer17may be an acrylic hot melt adhesive. The second cover film14may be an insulating resin material, such as polyimide. The second cover film14may be bonded to the second conductive layer12by using a second adhesive layer18, and the second adhesive layer18may be an acrylic hot melt adhesive.

In some other embodiments, the first area part may be provided with a through hole, and a conductive connector is disposed in the through hole. The conductive connector is separately connected to the first conductive layers11on the surfaces on both sides of the first area part, that is, the first conductive layers11on the surfaces on both sides of the first area part implements electrical connection by using the conductive connector.

In an embodiment of this application, as shown inFIG.1, a first base layer15may be disposed between the substrate10and the first conductive layer11. The first base layer15is a conductive material layer. During preparation, one layer of the first base layer15is disposed on a surface of the substrate10, helping to form the first conductive layer11. A second base layer16may be disposed between the substrate10and the second conductive layer12. The second base layer16is a conductive material layer. One layer of the second base layer16is disposed on a surface of the substrate10, helping to form the second conductive layer12.

Materials and/or thicknesses of the first base layer15and the second base layer16are the same, helping to form the first base layer15and the second base layer16on the substrate and simplify a preparation process.

In some embodiments, materials and/or thicknesses of the first conductive layer11and the second conductive layer12are the same, helping to form the first conductive layer11and the second conductive layer12, and simplify a preparation process.

In some embodiments, the first conductive layer11and the second conductive layer12may be metal material layers, for example, the first conductive layer11and the second conductive layer12are both copper layers. The first conductive layer11may be protected by using the first cover film13, to prevent the first conductive layer11from being oxidized and damaged by external air. The second conductive layer12may be protected by using the second cover film14, to prevent the second conductive layer12from being oxidized and damaged by external air.

In some embodiments, the battery-connected circuit board may be a flexible circuit board, to help to match the circuit board and the battery.

As shown inFIG.4toFIG.7, embodiments of this application provide a battery assembly. The battery assembly includes the battery-connected circuit board50and the cell structure20in the foregoing embodiment. An edge of the cell structure20may be provided with a sink21. A first conductive layer11, close to the cell structure20, of the first conductive layers11may be located in the sink21, without increasing an overall thickness. A surface on the other side of the second area part of the substrate10abuts against a surface on one side of the cell structure20, to reduce an overall thickness of the circuit board and a battery, helping to increase a capacity of the battery, and helping to reduce an overall thickness of a device. The first conductive layers11located on surfaces on both sides of the first area part are both electrically connected to a charging electrode of the cell structure20, and the cell structure20may be charged by using the first conductive layer11. In an entire battery compartment with a fixed thickness, a reduced thickness may be used to increase a thickness of the cell, helping to increase a battery capacity, increase use duration of a mobile phone, and improve user satisfaction.

In some embodiments, as shown inFIG.4andFIG.7, the battery assembly further includes a motherboard30. The cell structure20is disposed on one side of the motherboard30, and the battery-connected circuit board50is disposed on one side, away from the motherboard of the cell structure20. The first conductive layer II may be electrically connected to the motherboard30. The second conductive layer12may be electrically connected to the motherboard30. A current at the motherboard30may be used to charge cell structure20through the first conductive layer11and the second conductive layer12.

In some embodiments, as shown inFIG.4andFIG.7, the battery assembly further includes a charging board40. The charging board40is disposed on the motherboard30, and the charging board40may be a flexible circuit board. The charging board40is electrically connected to the motherboard30, and the charging board40is electrically connected to the charging electrode of the cell structure20. The motherboard30may further charge the cell structure20by using the charging board40. The motherboard30may charge the cell structure through the charging board40and the battery-connected circuit board50simultaneously, improving charging efficiency and facilitating heat loss.

In an embodiment of this application, as shown inFIG.4, a first connection part31and a second connection part32are disposed on the motherboard30, the cell structure20is disposed between the first connection part31and the second connection part32, the second conductive layer12is electrically connected to the first connection part31, one end of the charging board40is electrically connected to the charging electrode of the cell structure20, and the other end of the charging board40is electrically connected to the second connection part32. The first connection part31and the second connection part32are distributed at two ends of the cell structure20, and the charging board40and the battery-connected circuit board may be separated, facilitating heat loss during charging.

An embodiment of this application provides an electronic device. The electronic device includes the battery assembly in the foregoing embodiment. The electronic device with the battery assembly in the foregoing embodiment helps to reduce a thickness, increase a cell thickness, and increase a battery capacity.

During application of the battery-connected circuit board in this application, when the thickness of the circuit board is greatly reduced, an original impedance effect may remain unchanged.

The following further describes this application with reference to some embodiments. As shown inFIG.1andFIG.2, thicknesses of layers in Comparative embodiment 1 and Embodiment 1 are shown in the following Table 1. Both the conductive layer and the base layer are copper layers.

In the Comparative embodiment 1 and Embodiment 1, a thickness of the substrate remains unchanged, that is, the substrate is still 25 μm, the first base layer is still 18 μm, and a thickness of the first conductive layer is increased by 18 μm, so that an entire copper thickness is 18+18=36 μm. The copper thickness is 36 μm that is the same as the copper thickness in the Comparative Embodiment, an impedance may remain unchanged, but an entire thickness may be reduced by 136−98.5=37.5 μm. In the Embodiment 1, to ensure that an appearance of the circuit board of the battery that is seen when the device is disassembled is still black, and improve beauty, a cover film on one side may be retained, and a cover film on the other side may be removed. Description of an impedance changelessness principle: A shape of the circuit board in the comparative embodiment is the same as a shape of the circuit board in this application. To facilitate calculation, a length L and a width W of the circuit board are used as an example to facilitate calculation and demonstration. A calculation formula for a trace impedance is R=ρL/S=ρL/(W/d), where ρ is resistivity of copper, is a fixed constant, and is 0.0175 Ωmm2/m, L is a trace length, W is a trace width, and d is a copper thickness. In the comparative embodiment, an impedance of the second area part R1=ρL/(W×d)×(½)=ρL/(W×18)×(½)=ρL/36 W In the Embodiment 1, an impedance of the second area part R2=ρL/(W×d)=ρL/(W×(18+18))=ρL/36 W It may be learned that R1=R2, that is, an original impedance effect remains unchanged, but the thickness is greatly reduced.

As shown inFIG.1andFIG.3, thicknesses of layers in Comparative embodiment 2 and Embodiment 2 are shown in the following Table 2. Both the conductive layer and the base layer are copper layers.

In Comparative embodiment 2, the total thickness of the second area part is 190 μm, and the copper thickness is 70 μm. In Embodiment 2, a single-side film layer is used for the second area part, and the total thickness of the second area part is 157.5 μm, and the copper thickness is still 70 μm. The copper thickness remains unchanged, that is, an impedance remains unchanged, but a thickness may be reduced by 190 μm-157.5 μm=32.5 μm. To ensure that the copper thickness of the second area part is still 70 μm (the second base layer 50 μm+the second conductive layer 20 μm), a copper thickness of the first area part may be changed from 25 μm to 50 μm, a thickness of the adhesive layer may be changed from 35 μm to 50 μm, and a thickness of the entire area may be increased from 220 μm to 290 μm. During application, because the area part may be in a sink position without a thickness bottleneck, increase of the thickness does not affect an overall thickness of the device.

Description of an impedance changelessness principle: A shape of the circuit board in Comparative embodiment 2 is the same as a shape of the circuit board in Embodiment 2, To facilitate calculation, a length L and a width W of the circuit board are used as an example to facilitate calculation and demonstration. A calculation formula for a trace impedance is R=ρL/S=ρL/(W×d), where ρ is resistivity of copper, is a fixed constant, and is 0.0175 Ωmm2/m, L is a trace length, W is a trace width, and d is a copper thickness. In Comparative embodiment 2, an impedance of the second area part R1=ρL/(W×d)×(1/2)=ρL/(W×(10+25))×(1/2)=ρL/70 W. In Embodiment 2, an impedance of the second area part R2=ρL/(W×d)=ρL/(W×(20+50))=ρL/70 W. It may be learned that R1=R2, that is, an original impedance effect remains unchanged, but the thickness is greatly reduced.

The embodiments of this application are described with reference to the accompanying drawings. However, this application is not limited to the foregoing implementations. The foregoing implementations are merely examples, but are not limiting. Under the enlightenment of this application, a person of ordinary skill in the art max make many forms without departing from the objective and the scope of the claims of this application, and these forms all fall within the protection scope of this application.