WO2024001088A1

WO2024001088A1 - Charging and discharging circuit, charging and discharging control method, and electronic device

Info

Publication number: WO2024001088A1
Application number: PCT/CN2022/140680
Authority: WO
Inventors: 方俊伟; 潘晓佳
Original assignee: Oppo广东移动通信有限公司
Priority date: 2022-06-28
Filing date: 2022-12-21
Publication date: 2024-01-04
Also published as: CN115051441A

Abstract

Disclosed in the embodiments of the present application are a charging and discharging circuit, a charging and discharging control method, and an electronic device. The charging and discharging circuit comprises: a battery, which is a single-cell silicon negative electrode battery; a first charging circuit, which is connected to the battery, and is used for: when a battery voltage of the battery is lower than a preset threshold value, converting a received initial charging voltage into a first charging voltage, which is required by the battery, so as to charge the battery; and a first discharging circuit, which is respectively connected to the battery and a load unit, and is used for: when the battery voltage of the battery is lower than the preset threshold value, performing boosting conversion on the battery voltage and then providing same to the load unit, so as to supply power to the load unit, wherein the first charging circuit is independent of the first discharging circuit. In this way, the problem of instability caused by simultaneous charging and discharging in a low-voltage state can be solved by using the charging and discharging circuit.

Description

Charge and discharge circuit, charge and discharge control method and electronic equipment

Cross-references to related applications

This application requires the priority of the Chinese patent application submitted to the China Patent Office on June 28, 2022, with the application number 202210752607. This reference is incorporated into this application.

Technical field

The present application relates to the field of charging and discharging technology, and in particular, to a charging and discharging circuit, a charging and discharging control method and an electronic device.

Background technique

At present, most of the commonly used power supply, energy storage and other devices are lithium-ion batteries, and the most commonly used ones are graphite negative electrodes. Although graphite anodes have the advantages of low cost and low lithium insertion potential, as the functions of electronic devices such as smart terminals and electric vehicles have continued to strengthen in recent years, higher requirements have been placed on batteries.

Since the specific capacity of the graphite anode is low, which greatly limits the energy density of the battery, more anodes with high specific capacity are being used, such as silicon anodes. Silicon anode batteries can reduce the discharge depth of the battery from 3.4V to 3.0V, or even to 2.5V, effectively increasing the energy density of the battery and achieving better battery capacity in the same space. However, in existing charging and discharging solutions, although the battery charging speed can be increased by adjusting the charging rate, it cannot solve the discharge problem when the battery voltage is below 3.4V.

Contents of the invention

The technical solution of this application is implemented as follows:

In a first aspect, embodiments of the present application provide a charging and discharging circuit, which may include:

A battery, wherein the battery is a single-cell silicon anode battery;

A first charging circuit, connected to the battery, used to convert the received initial charging voltage into a first charging voltage required by the battery when the battery voltage of the battery is lower than a preset threshold. Charge;

A first discharge circuit is connected to the battery and the load unit respectively, and is used to boost the battery voltage and provide power to the load unit when the battery voltage of the battery is lower than a preset threshold; wherein , the first charging circuit is independent of the first discharging circuit.

In the second aspect, embodiments of the present application provide a charge and discharge control method, which may include:

Detecting the battery voltage of the battery; wherein the battery is a single-cell silicon negative electrode battery;

When the battery voltage is lower than the preset threshold, the first charging circuit converts the received initial charging voltage into the first charging voltage required by the battery to charge the battery;

When the battery voltage is lower than the preset threshold, the battery voltage is boosted and converted through the first discharge circuit and then supplied to the load unit; wherein the first charging circuit is independent of the first discharge circuit.

In a third aspect, embodiments of the present application provide an electronic device, which includes the charging and discharging circuit as described in the first aspect.

Description of drawings

Figure 1 is a schematic structural diagram of a charging and discharging circuit provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of another charging and discharging circuit provided by an embodiment of the present application;

Figure 3 is a schematic structural diagram of another charging and discharging circuit provided by an embodiment of the present application;

Figure 4 is a schematic structural diagram of yet another charging and discharging circuit provided by an embodiment of the present application;

Figure 5 is a schematic structural diagram of yet another charging and discharging circuit provided by an embodiment of the present application;

Figure 6 is a schematic structural diagram of yet another charging and discharging circuit provided by an embodiment of the present application;

Figure 7 is a schematic structural diagram of yet another charging and discharging circuit provided by an embodiment of the present application;

Figure 8 is a schematic structural diagram of yet another charging and discharging circuit provided by an embodiment of the present application;

Figure 9 is a schematic structural diagram of yet another charging and discharging circuit provided by an embodiment of the present application;

Figure 10 is a detailed structural schematic diagram of a charging and discharging circuit provided by an embodiment of the present application;

Figure 11 is a detailed structural schematic diagram of another charging and discharging circuit provided by an embodiment of the present application;

Figure 12 is a detailed structural schematic diagram of another charging and discharging circuit provided by an embodiment of the present application;

Figure 13 is a schematic flow chart of a charge and discharge control method provided by an embodiment of the present application;

Figure 14 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

Detailed ways

In a first aspect, embodiments of the present application provide a charging and discharging circuit. The charging and discharging circuit includes:

A battery, wherein the battery is a single-cell silicon anode battery;

In some embodiments, the first discharge circuit includes a boost circuit, and one end of the boost circuit is connected to the load unit, and the other end of the boost circuit is connected to the battery;

The boost circuit is used to boost the battery voltage and convert the converted battery voltage when the battery voltage of the battery is lower than the preset threshold and the boost circuit is in a conductive state. Provide power to the load unit.

In some embodiments, the first charging circuit includes a first charging chip, and one end of the first charging chip is used to receive the initial charging voltage, and the other end of the first charging chip is connected to the battery. ;

The first charging chip is used to convert the initial charging voltage to the desired voltage required by the battery when the battery voltage of the battery is lower than the preset threshold and the first charging chip is in a conductive state. The first charging voltage is used to charge the battery.

In some embodiments, the charging and discharging circuit further includes a second charging circuit and a second discharging circuit; wherein,

The second charging circuit is connected to the battery and is used to convert the received initial charging voltage into a second charging voltage required by the battery when the battery voltage of the battery is higher than a preset threshold. battery charging;

The second discharge circuit is respectively connected to the battery and the load unit, and is used to provide the battery voltage to the load unit when the battery voltage of the battery is higher than a preset threshold.

In some embodiments, the second charging circuit includes the first charging chip, and one end of the first charging chip is used to receive the initial charging voltage, and the other end of the first charging chip is connected to the first charging chip. battery connection;

The first charging chip is also used to convert the initial charging voltage into a voltage required by the battery when the battery voltage of the battery is higher than the preset threshold and the first charging chip is in a conductive state. The second charging voltage charges the battery.

In some embodiments, the second charging circuit includes the first charging chip and a first switching element, and one end of the first charging chip is used to receive the initial charging voltage. The other end is connected to one end of the first switching element, and the other end of the first switching element is connected to the battery;

The first charging chip is also used to convert the initial charging voltage when the battery voltage of the battery is higher than a preset threshold and both the first charging chip and the first switching element are in a conductive state. The second charging voltage required by the battery is used to charge the battery.

In some embodiments, the second discharging circuit includes the first charging chip, and one end of the first charging chip is connected to the load unit, and the other end of the first charging chip is connected to the battery. ;

The first charging chip is also used to provide the battery voltage to the load unit when the battery voltage of the battery is higher than the preset threshold and the first charging chip is in a conductive state.

In some embodiments, the second discharge circuit includes the first charging chip and a first switching element, and one end of the first charging chip is connected to the load unit, and the other end of the first charging chip It is connected to one end of the first switching element, and the other end of the first switching element is connected to the battery;

The first charging chip is also used to change the battery voltage when the battery voltage of the battery is higher than the preset threshold and both the first charging chip and the first switching element are in a conductive state. Provide power to the load unit.

In some embodiments, the load unit includes a first load unit and a second load unit, the first discharge circuit is connected to the first load unit, and the second discharge circuit is connected to the second load unit. connect;

The first discharge circuit is also used to boost the battery voltage and provide power to the first load unit when the battery voltage is lower than a preset threshold;

The second discharge circuit is also used to provide the battery voltage to the second load unit when the battery voltage is higher than a preset threshold.

In some embodiments, the first discharging circuit includes a first charging chip and a boost circuit, and one end of the first charging chip is connected to the load unit, and the other end of the first charging chip is connected to the One end of the boost circuit is connected, and the other end of the boost circuit is connected to the battery;

The first charging chip is used to charge the battery through the boost circuit when the battery voltage of the battery is lower than the preset threshold and both the first charging chip and the boost circuit are in a conductive state. After the battery voltage is boosted and converted, the converted battery voltage is provided to the load unit.

In some embodiments, the first charging circuit includes a second charging chip, and one end of the second charging chip is used to receive the initial charging voltage, and the other end of the second charging chip is connected to the battery. ;

The second charging chip is used to convert the initial charging voltage into the third voltage required by the battery when the battery voltage of the battery is lower than a preset threshold and the second charging chip is in a conductive state. A charging voltage to charge the battery.

In some embodiments, the charging and discharging circuit further includes a third charging circuit, and the third charging circuit is connected to the battery;

The third charging circuit is configured to convert the received initial charging voltage into a third charging voltage required by the battery to charge the battery when the charging speed of the battery is higher than a preset speed threshold.

In some embodiments, the third charging circuit includes a charge pump circuit and a second switching element, and one end of the second switching element is used to receive the initial charging voltage, and the other end of the second switching element is connected to One end of the charge pump circuit is connected, and the other end of the charge pump circuit is connected to the battery; wherein,

The charge pump circuit is used to convert the initial charging voltage to the predetermined speed threshold when the charging speed of the battery is higher than a preset speed threshold and both the charge pump circuit and the second switching element are in a conductive state. The third charging voltage required by the battery is used to charge the battery.

In some embodiments, the charge and discharge circuit also includes a detection module and a control module; wherein,

The detection module is used to perform voltage detection on the battery and determine the battery voltage;

The control module is configured to control the first charging circuit to be in a working state when the battery voltage is lower than a preset threshold, and/or to control the first discharging circuit to be in a working state.

In a second aspect, embodiments of the present application provide a charge and discharge control method, which method includes:

In some embodiments, the first discharging circuit includes a boost circuit, and the method further includes:

When the battery voltage is lower than the preset threshold and the boost circuit is in a conductive state, the battery voltage is boosted and converted by the boost circuit, and the converted battery voltage is provided to the load unit. powered by.

In some embodiments, the method further includes:

When the battery voltage is higher than the preset threshold, convert the received initial charging voltage into the second charging voltage required by the battery through the second charging circuit to charge the battery;

When the battery voltage is higher than the preset threshold, the battery voltage is provided to the load unit through the second discharge circuit.

In some embodiments, the load unit includes a first load unit and a second load unit, and the method further includes:

When the battery voltage is lower than the preset threshold, the battery voltage is boosted and converted through the first discharge circuit and then supplied to the first load unit;

When the battery voltage is higher than the preset threshold, the battery voltage is provided to the second load unit through the second discharge circuit.

In some embodiments, the method further includes:

When the charging speed of the battery is higher than the preset speed threshold, the received initial charging voltage is converted into a third charging voltage required by the battery through the third charging circuit to charge the battery.

In order to understand the characteristics and technical content of the embodiments of the present application in more detail, the implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or a different subset of all possible embodiments, and Can be combined with each other without conflict. It should also be pointed out that the terms "first\second\third" involved in the embodiments of this application are only used to distinguish similar objects and do not represent a specific ordering of objects. It is understandable that "first\second\ The third "specific order or sequence may be interchanged where permitted, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein.

Energy density, that is, the amount of electricity that can be stored per unit weight or unit volume, is an important performance indicator of a battery. The key to improving battery energy density lies in improving the positive and negative electrode materials, especially the negative electrode materials. The commonly used positive electrode material of lithium-ion batteries is generally metal oxide, and the negative electrode material is graphite.

In the embodiment of the present application, in order to increase the energy density of the battery, a lithium-ion battery whose negative electrode material is silicon (referred to as a "silicon negative electrode battery") is used as a power supply battery for electronic equipment. The working voltage range of the graphite negative electrode can be 3.4V~4.45V, and the working voltage range of the silicon negative electrode can be 2.5V~4.45V or 3.0V~4.45V. Therefore, the discharge cut-off voltage of graphite anode batteries is generally set to 3.4V, and the discharge cut-off voltage of silicon anode batteries can be set to any value between 2.5V and 3.0V.

Understandably, single-cell silicon anode batteries have gradually become the first choice for improving the energy density of lithium-ion batteries in electronic devices. Single-cell silicon anode batteries can reduce the battery's depth of discharge from 3.4V to 3.0V, or even to 2.5V, effectively increasing the energy density of the battery and achieving better battery capacity in the same space. However, since the minimum operating voltage of software set by some platforms in electronic equipment is 3.2V, the shutdown protection voltage of electronic equipment is generally set to 3.4V to ensure the normal operation of electronic equipment. If a single-cell silicon anode battery is used in electronic equipment, if the shutdown protection voltage is set to 3.4V, and the discharge cut-off voltage of a single-cell silicon anode battery is 2.5V ~ 3.0V, on the one hand, it is possible This will result in the power of the single-cell silicon anode battery not being effectively utilized; on the other hand, some loads of electronic equipment cannot directly use power supplies lower than 3.4V because the low-voltage power supply will cause the radio frequency power amplifier (Power Amplifier, PA) and other chip performance deteriorates.

In related technologies, there are also some charging and discharging schemes for silicon anode batteries. For example, silicon anode batteries and carbon anode batteries are connected in series to jointly supply power to the unit to be powered; or different charging rates are used to increase the silicon anode battery under each battery voltage. The charging efficiency of the negative battery is improved, and the large floating pressure generated by the internal resistance of the battery is avoided. However, these solutions have some shortcomings. Among them, the former is only used for dual-cell batteries, and requires that silicon anode batteries and carbon anode batteries must be connected in series, and is not suitable for single-cell silicon anode batteries; the latter is mainly used for During the charging stage, the discharge problem when the battery voltage is lower than 3.4V cannot be solved, that is, there is a problem that the load performance of some electronic devices deteriorates when the battery voltage is lower than 3.4V.

Based on this, embodiments of the present application provide a charging and discharging circuit, which is applied to a single-cell silicon negative electrode battery and includes a charging and discharging scheme, which can achieve the following two characteristics: on the one hand, based on a boost circuit It ensures that the discharge voltage is always 3.4V and above, which solves the problem of poor load performance of some electronic devices when the battery voltage is lower than 3.4V; on the other hand, it can realize the discharge circuit and charging circuit when the battery voltage is lower than 3.4V The separation solves the problem of unstable working mode of the boost circuit caused by simultaneous charging and discharging under low voltage conditions.

In an embodiment of the present application, see FIG. 1 , which shows a schematic structural diagram of a charging and discharging circuit 10 provided in an embodiment of the present application. As shown in Figure 1, the charging and discharging circuit 10 may include: a battery 11, a first charging circuit 12, a first discharging circuit 13 and a load unit 14; wherein,

Battery 11, wherein the battery is a single-cell silicon negative electrode battery;

The first charging circuit 12 is connected to the battery 11 and is used to convert the received initial charging voltage into the first charging voltage required by the battery to charge the battery 11 when the battery voltage of the battery is lower than the preset threshold;

The first discharge circuit 13 is connected to the battery 11 and the load unit 14 respectively, and is used to boost the battery voltage and provide power to the load unit after the battery voltage is lower than the preset threshold; wherein, the first charging circuit 12 is independent of the first discharge circuit 13.

It should be noted that in the embodiment of the present application, the battery 11 may be a single-cell silicon anode battery. Silicon anode is a development direction to improve the energy density of lithium-ion batteries at the anode level. However, because the discharge curve of the silicon anode is different from that of the traditional graphite anode, lithium-ion batteries with silicon anodes are not suitable for direct application in existing electronic devices. Currently, the shutdown protection voltage of electronic equipment is generally set to 3.4V to ensure the normal operation of the electronic equipment; that is to say, the preset threshold here can be set to 3.4V, but this is not specifically limited in the embodiment of this application. However, since the discharge cut-off voltage of a single-cell silicon anode battery is 2.5V to 3.0V, the power of a single-cell silicon anode battery cannot be effectively utilized.

In some embodiments, in order to fully utilize the power of the silicon anode battery, the system of the electronic device can be adjusted, that is, the system software, circuits, etc. of the electronic device need to be improved so that the minimum operating voltage of the system is reduced, for example, to 3.0 V or even below; however, this requires changing the entire system architecture and adjusting the power supply system of electronic equipment, and the application cost is high.

In other embodiments, in order to fully utilize the power of the silicon negative electrode battery, the circuit structure of the charging and discharging circuit can also be adjusted. Specifically, a first discharge circuit 13 is provided in the charge and discharge circuit 10. When the battery voltage is lower than 3.4V, the battery voltage is boosted through the first discharge circuit 13 and provided to the system load for power supply; thus, not only can Silicon anode batteries can continue to power system loads when the battery voltage is lower than 3.4V, and can also solve the problem of poor load performance in some electronic devices when the battery voltage is lower than 3.4V.

It should also be noted that in the embodiment of the present application, the first discharge circuit 13 is independent of the first charging circuit 12, so that when the battery voltage is lower than 3.4V (ie, low voltage state), simultaneous charging and discharging in the low voltage state are solved. resulting in instability problems.

In some embodiments, based on the charging and discharging circuit 10 shown in FIG. 1 , referring to FIG. 2 , the first discharging circuit 13 may include a boost circuit 131 , and one end of the boost circuit 131 is connected to the load unit 14 . The other end of the circuit 131 is connected to the battery 11;

The boost circuit 131 is used to boost and convert the battery voltage when the battery voltage is lower than a preset threshold and the boost circuit is in a conductive state, and provide the converted battery voltage to the load unit 14 for power supply.

In the embodiment of the present application, the boost circuit 131 may include at least one of the following: a boost conversion circuit, a boost-buck conversion circuit, and a boost/bypass conversion circuit.

It should be noted that in the embodiment of the present application, these conversion circuits are all DC-DC (Direct Current-to-Direct Current, DC-DC) circuits. Therefore, the boost circuit 131 may also be a boost DC-DC circuit, a boost-buck DC-DC circuit, or a boost/bypass DC-DC circuit, etc., without any limitation here. In addition, although the buck-boost DC-DC circuit or the boost/bypass DC-DC circuit can also satisfy the step-up conversion of the battery voltage, the cost is higher than that of the step-up DC-DC circuit, so the boost in this embodiment The circuit 131 can select a boost DC-DC circuit, that is, a boost conversion circuit (also referred to as a Boost circuit for short), to achieve boost conversion of the battery voltage.

In this way, taking the preset threshold value of 3.4V as an example, if the battery voltage is lower than 3.4V, the boost circuit 131 can be controlled to be on; if the battery voltage is higher than 3.4V, the boost circuit 131 can be controlled to be off. status, thereby ensuring that the discharge voltage of the battery 11 is always 3.4V or above, solving the problem that the load performance of some systems in electronic equipment deteriorates when the battery voltage is below 3.4V.

In some embodiments, based on the charging and discharging circuit 10 shown in Figure 1, referring to Figure 2, the first charging circuit 12 may include a first charging chip 121, and one end of the first charging chip 121 is used to receive the initial charging voltage. , the other end of the first charging chip 121 is connected to the battery 11;

The first charging chip 121 is used to convert the initial charging voltage into the first charging voltage required by the battery to charge the battery 11 when the battery voltage of the battery is lower than the preset threshold and the first charging chip is in the conductive state.

In the embodiment of the present application, the first charging chip 121 can be the main charging chip (Main Charger IC), which is mainly used to convert the initial charging voltage into the first charging voltage required by the battery when the battery voltage is lower than 3.4V, so as to Charge battery 11.

It should also be noted that in the embodiment of the present application, the charging and discharging circuit 10 may also include a charging interface (not shown in the figure), which is used to provide an initial charging voltage. The initial charging voltage may be the DC bus voltage (VBUS) or the initial charging voltage provided by an external power supply. Here, the charging interface is connected to an external power supply, and the external power supply can be an adapter, a mobile power supply, a charger, a power bank, etc., without any limitation.

It should also be noted that in the embodiment of the present application, in order to prevent device damage caused by excessive input voltage, an overvoltage protection (Over Voltage Protection, OVP) circuit can be set after the charging interface. In this way, if the initial charging voltage exceeds the OVP threshold, the output of the overvoltage protection circuit will be turned off, thereby also protecting the device from damage due to excessive voltage.

It can be understood that in the embodiment of the present application, the battery voltage may not only be lower than the preset threshold, but also may be higher than the preset threshold. Therefore, in some embodiments, based on the charging and discharging circuit 10 shown in Figure 1, referring to Figure 3, the charging and discharging circuit 10 may also include a second charging circuit 15 and a second discharging circuit 16; wherein,

The second charging circuit 15 is connected to the battery 11 and is used to convert the received initial charging voltage into the second charging voltage required by the battery to charge the battery 11 when the battery voltage of the battery is higher than the preset threshold;

The second discharge circuit 16 is connected to the battery 11 and the load unit 14 respectively, and is used to provide the battery voltage to the load unit 14 when the battery voltage is higher than the preset threshold.

In a possible embodiment, the second charging circuit 15 and the first charging circuit 12 can reuse the same charging path, that is, the second charging circuit 15 can reuse the first charging chip 121 in the first charging circuit 12 . Specifically, based on the charging and discharging circuit 10 shown in FIG. 2, referring to FIG. 4, the second charging circuit 15 may include a first charging chip 121, and one end of the first charging chip 121 is used to receive the initial charging voltage. The other end of the charging chip 121 is connected to the battery 11;

The first charging chip 121 is also used to convert the initial charging voltage to the second charging voltage required by the battery to charge the battery 11 when the battery voltage of the battery is higher than the preset threshold and the first charging chip is in the conductive state.

It should be noted that in the embodiment of the present application, the first charging circuit 12 corresponds to the charging path when the battery voltage is lower than the preset threshold, and the second charging circuit 15 corresponds to the charging path when the battery voltage is higher than the preset threshold. That is, for any battery voltage, the initial charging voltage can be converted into the second charging voltage required by the battery through the first charging chip 121 in order to charge the battery 11 .

It should also be noted that in the embodiment of the present application, the second discharging circuit 16 can share the same path with the second charging circuit 15 , or it can be said that the second discharging circuit 16 can also reuse the third circuit in the first charging circuit 12 . A charging chip 121. Specifically, based on the charging and discharging circuit 10 shown in FIG. 2 , referring to FIG. 4 , the second discharging circuit 16 may include a first charging chip 121 , and one end of the first charging chip 121 is connected to the load unit 14 . The other end of the chip 121 is connected to the battery 11;

The first charging chip 121 is also used to provide battery voltage to the load unit 14 when the battery voltage is higher than the preset threshold and the first charging chip is in a conductive state.

It should be noted that in the embodiment of the present application, the first discharge circuit 13 corresponds to the discharge path when the battery voltage is lower than the preset threshold, and the second discharge circuit 16 corresponds to the charging path when the battery voltage is higher than the preset threshold. That is, the discharge path in the low-voltage state is separated from the discharge path in the high-voltage state. For low voltage states (for example, the battery voltage is lower than 3.4V), the boost circuit 131 can ensure that the discharge voltage is always 3.4V and above, which solves the problem of poor system load performance of some electronic devices when the battery voltage is below 3.4V. ; In addition, for a high-voltage state (for example, the battery voltage is greater than 3.4V), the battery voltage is directly provided to the load unit 14 through the first charging chip 121 instead of discharging through the boost circuit 131, which can also increase the voltage above 3.4V. Discharge efficiency.

In another possible embodiment, the second charging circuit 15 not only includes the first charging chip 131 but also includes a first switching element. Specifically, based on the charging and discharging circuit 10 shown in Figure 2, referring to Figure 5, the second charging circuit 15 may include a first charging chip 121 and a first switching element 151, and one end of the first charging chip 121 is used to receive Initial charging voltage, the other end of the first charging chip 121 is connected to one end of the first switching element 151, and the other end of the first switching element 151 is connected to the battery 11;

The first charging chip 121 is also used to convert the initial charging voltage into the second charging required by the battery when the battery voltage of the battery is higher than the preset threshold and the first charging chip 121 and the first switching element 151 are both in the conductive state. voltage to charge the battery 11.

It should be noted that in the embodiment of the present application, the first switching element 151 may be a metal-oxide semiconductor field-effect transistor (MOSFET or MOS transistor for short), but it may also be a switching transistor. , transistors, insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, IGBT) and other devices with switching functions, there are no restrictions here.

It should also be noted that in the embodiment of the present application, the second discharging circuit 16 may share the same path with the second charging circuit 15, or it can be said that the second discharging circuit 16 may reuse the first path in the second charging circuit 15. charging chip 121 and first switching element 151. Specifically, based on the charging and discharging circuit 10 shown in FIG. 2, referring to FIG. 5, the second discharging circuit 16 may include a first charging chip 121 and a first switching element 151, and one end of the first charging chip 121 is connected to the load unit. 14 is connected, the other end of the first charging chip 121 is connected to one end of the first switching element 151, and the other end of the first switching element 151 is connected to the battery 11;

The first charging chip 121 is also used to provide battery voltage to the load unit 14 when the battery voltage is higher than the preset threshold and the first charging chip and the first switching element are both in a conductive state.

It should be noted that in the embodiment of the present application, for the discharge mode, if the battery voltage is lower than 3.4V, then the boost circuit 131 needs to be controlled to be in the on state, and the first charging chip 121 and the first switching element 151 need to be in the off state. On state to turn on the first discharge circuit and turn off the second discharge circuit; if the battery voltage is higher than 3.4V, then the boost circuit 131 needs to be controlled to be in the off state, and the first charging chip 121 and the first switching element 151 In a conductive state, the first discharge circuit is turned off and the second discharge circuit is turned on. It should be noted that when the battery voltage is higher than 3.4V, the battery charging function in the first charging chip 121 is turned off at this time.

It should also be noted that in the embodiment of the present application, as shown in Figure 5, for the lower charging circuit 12, if the battery voltage is lower than 3.4V, the first charging circuit 12 may also include a first charging circuit at this time. The chip 121 and the first switching element 151, that is, the first charging circuit 12 and the second charging circuit 15 share the same path. Therefore, for any battery voltage, the first charging chip 121 and the first switching element 151 can be controlled to be conductive. state to convert the initial charging voltage into the first charging voltage/second charging voltage required by the battery to charge the battery 11.

That is to say, in the embodiment of the present application, the first discharge circuit 13 is connected between the battery 11 and the load unit 14, and the first charging circuit 12, the second charging circuit 15 and the second discharging circuit 16 can share the same path. , can reuse the first charging chip 121 or reuse the first charging chip 121 and the first switching element 151; thus, on the one hand, based on the boost circuit, it is guaranteed that the discharge voltage is always 3.4V and above, solving the problem that the battery voltage is lower than 3.4V. When the battery voltage is lower than 3.4V, the load performance of some electronic devices deteriorates. On the other hand, the separation of the discharge circuit and the charging circuit can be realized when the battery voltage is lower than 3.4V, which solves the problem of simultaneous charging and discharging in a low voltage state causing the boost circuit to operate. Mode instability problem.

It can also be understood that, considering the control complexity when switching when the battery voltage is lower than the preset threshold and the battery voltage is higher than the preset threshold, the first discharge circuit 13 and the second discharge circuit 13 in the embodiment of the present application The discharge circuit 16 may reuse the first charging chip 121. In some embodiments, based on the charge and discharge circuit 10 shown in Figure 2, referring to Figure 6, the first discharge circuit 13 may include a first charging chip 121 and a boost circuit 131, and one end of the first charging chip 121 is connected to The load unit 14 is connected, the other end of the first charging chip 121 is connected to one end of the boost circuit 131, and the other end of the boost circuit 131 is connected to the battery 11;

The first charging chip 121 is used to perform boost conversion on the battery voltage through the boost circuit 131 when the battery voltage of the battery is lower than the preset threshold and both the first charging chip 121 and the boost circuit 131 are in a conductive state. The converted battery voltage is provided to power the load unit 14 .

That is to say, in the embodiment of the present application, the first discharge circuit 13 and the second discharge circuit 16 reuse the first charging chip 121, mainly considering that when the battery voltage is lower than the preset threshold and the battery voltage is higher than the preset threshold, The control complexity when switching between these two situations. Although for the first discharging circuit 13, the battery voltage can be directly supplied to the load unit 14 after being boosted and converted by the voltage boosting circuit 131, at this time the first discharging circuit (when the battery voltage is lower than the preset threshold) ) to the second discharge circuit (that is, when the battery voltage is higher than the preset threshold), both the first charging chip 121 and the first switching element 151 need to be controlled to be in a conductive (ie, open) state at the same time, so that the second discharge circuit can be turned on. The second discharge circuit 16 and the control boost circuit 131 are in a shutdown (i.e. closed, disconnected) state to disconnect the first discharge circuit 13; conversely, if the first charging chip 121 serves as the first discharge circuit 13 and the second discharge circuit 16 multiplexing part, then when switching, you only need to control the on/off state of the first switching element 151 and the on/off state of the boost circuit 131 to realize the first discharge circuit and the second Switching between discharge circuits simplifies the control complexity during switching.

Furthermore, in order to solve the problem of unstable operating mode of the boost circuit caused by simultaneous charging and discharging in a low-voltage state, the first discharging circuit 13 and the first charging circuit 12 need to be completely separated. Therefore, the embodiment of the present application can also introduce a second charging chip. In some embodiments, based on the charging and discharging circuit 10 shown in FIG. 2 , referring to FIG. 6 , the first charging circuit 12 may include a second charging chip 122 , and one end of the second charging chip 122 is used to receive the initial charging voltage. , the other end of the second charging chip 122 is connected to the battery 11;

The second charging chip 122 is used to convert the initial charging voltage into the first charging voltage required by the battery to charge the battery 11 when the battery voltage of the battery is lower than the preset threshold and the second charging chip is in the conductive state.

It should be noted that, taking the preset threshold value as 3.4V as an example, when the battery voltage of the battery is lower than 3.4V, the first charging circuit 12 includes a second charging chip 122 , and the first discharging circuit 13 includes a first charging chip 121 And the boost circuit 131 can also realize the separation of the discharge circuit and the charging circuit when the battery voltage is lower than 3.4V, solving the problem of unstable working mode of the boost circuit 131 caused by simultaneous charging and discharging in a low voltage state.

It should also be noted that in the embodiment of the present application, the first charging chip 121 can be a main charging chip (Main Charger IC), the second charging chip 122 can be a auxiliary charging chip (Sub Charger IC), and the first switching element 151 It can be a MOS tube.

In addition, it should be noted that for the first discharge circuit 13 and the second discharge circuit 16, although the first charging chip 121 is in a conductive state, the battery charging function in the first charging chip 121 is turned off at this time. . In addition, when the battery voltage of the battery is lower than 3.4V, the boost circuit 131 is in a conductive state, that is, the voltage boost circuit 131 is discharged; and when the battery voltage is higher than 3.4V, the boost circuit 131 is turned off. state, the first switching element 151 is in a conductive state, that is, discharging is performed through the first switching element 151 instead of the boost circuit 131, which can also improve the discharging efficiency above 3.4V.

It should also be noted that when the battery voltage is higher than the preset threshold, the first charging chip 121 can be used to charge the battery. However, for situations where the charging power is relatively large, for example, if the charging power provided by the adapter is 9V/2A, in some embodiments, the embodiments of the present application can also control the first charging circuit 12 and the second charging circuit 15 to be in the working state at the same time. , that is, using the first charging chip 121 and the second charging chip 122 to charge the battery at the same time.

It can be understood that in the embodiment of the present application, for the discharge mode when the battery voltage is lower than 3.4V, one end of the boost circuit 131 as shown in Figure 2, Figure 4 or Figure 5 can be connected to the load unit 14 The direct connection may also be an indirect connection between one end of the boost circuit 131 and the load unit 14 through the first charging chip 121 as shown in FIG. 6 . In addition, the load unit 14 can also be divided into a first load unit and a second load unit; wherein the first load unit includes a load module with a load voltage higher than a preset threshold, and the second load unit includes a load module with a load voltage lower than a preset threshold. Load module with preset thresholds.

In some embodiments, based on the charge and discharge circuit 10 shown in Figure 4, referring to Figure 7, the load unit 14 includes a first load unit 141 and a second load unit 142, and the first discharge circuit 13 and the first load unit 141 is connected, the second discharge circuit 16 is connected to the second load unit 142;

The first discharge circuit 13 is also used to boost the battery voltage and provide power to the first load unit 141 when the battery voltage is lower than the preset threshold;

The second discharge circuit 16 is also used to provide the battery voltage to the second load unit 142 when the battery voltage is higher than the preset threshold.

In the embodiment of this application, for the load unit 14, the load unit 14 may include but is not limited to the following modules: processor module, keyboard module, display module, short message application module, address book application module, third-party application module, etc. . Here, the load units 14 can be divided into two broad categories: first load units 141 and second load units 142 . Taking the preset threshold as 3.4V as an example, the load voltage in the first load unit 141 is higher than 3.4V, and the load voltage in the second load unit 142 is lower than 3.4V. In addition, for the case where the load voltage is equal to 3.4V, it may belong to the first load unit 141 or the second load unit 142. This embodiment of the present application does not impose any limitation on this.

It should also be noted that in this embodiment of the present application, the first discharging circuit 13 may include a boost circuit 131 , and the second discharging circuit 16 may include a lower charging chip 121 . The number of boost circuits 131 included here may be more than one. If there are more than two boost circuits 131 included, these boost circuits 131 are connected in parallel.

Further, for the boost circuit 131, in some embodiments, the first discharge circuit 13 is specifically used to boost the battery voltage through the boost circuit when the battery voltage is lower than the preset threshold, and The converted battery voltage is supplied to the first load unit 141; or, when the battery voltage is higher than the preset threshold, the battery voltage is bypass-converted through the boost circuit, and the converted battery voltage is provided to the first load. Unit 141 supplies power. Therefore, the boost circuit 131 in this embodiment can select a boost/bypass DCDC circuit to implement boost conversion or bypass conversion of the battery voltage.

That is to say, in the embodiment of the present application, taking the preset threshold as 3.4V as an example, the first load unit 141 can be a part of the system load that requires a voltage above 3.4V, and the second load unit 142 can be a voltage below 3.4V. voltage to other parts of the system load. In this way, in addition to being directly connected to all system loads, the boost circuit 131 can also be connected to only a part of the system loads that require a voltage above 3.4V. The remaining system loads are still directly powered by the battery 11 through the first charging chip 121 . Among them, as shown in Figure 7, if the battery voltage is lower than 3.4V, the boost circuit 131 is in the boost mode at this time, and needs to boost the battery voltage before transmitting it to some system loads that require voltages above 3.4V; If the battery voltage is higher than 3.4V, the boost circuit 131 is in the bypass mode at this time, and performs bypass conversion on the battery voltage before transmitting it to some system loads that require voltages above 3.4V.

It can also be understood that in some embodiments, based on the charge and discharge circuit 10 shown in Figure 1, referring to Figure 8, the charge and discharge circuit 10 can also include a third charging circuit 17, and the third charging circuit 17 is connected to the battery. 11 connection;

The third charging circuit 17 is used to convert the received initial charging voltage into the third charging voltage required by the battery to charge the battery 11 when the charging speed of the battery is higher than the preset speed threshold.

In a specific embodiment, as shown in Figure 8, the third charging circuit 17 may include a charge pump circuit 171 and a second switching element 172, and one end of the second switching element 172 is used to receive the initial charging voltage, and the second The other end of the switching element 172 is connected to one end of the charge pump circuit 171, and the other end of the charge pump circuit 171 is connected to the battery 11; wherein,

The charge pump circuit 171 is used to convert the initial charging voltage into the third charging voltage required by the battery to charge the battery 11 when both the charge pump circuit 171 and the second switching element 172 are in a conductive state.

It should be noted that in the embodiment of the present application, the charge pump circuit 171 may be a charge pump (Charge pump). For example, the charge pump circuit 171 may be a 2:1 charging charge pump, where 2:1 refers to the ratio of the input voltage to the output voltage of the charging charge pump.

It should also be noted that in the embodiment of the present application, the second switching element 172 can be a MOS transistor, or a device with a switching function such as a switching transistor, a transistor, an IGBT, etc., and there is no limitation here.

It should also be noted that in the embodiment of the present application, if the input end of the charging and discharging circuit 10 is connected to the adapter. According to the charging speed of the adapter, it can be divided into normal charging adapter and fast charging adapter, and the charging speed of the normal charging adapter is lower than the charging speed of the fast charging adapter. Correspondingly, the first charging circuit 12 and the second charging circuit 15 are used for normal charging of the battery 11 according to the normal charging adapter, and the third charging circuit 17 is used for fast charging of the battery 11 according to the fast charging adapter. In the case of normal charging, the first charging circuit 12 is a charging circuit for a battery voltage lower than a preset threshold, and the second charging circuit 15 is a charging circuit for a battery voltage higher than the preset threshold.

Further, in the embodiment of the present application, regarding the on and off of the first charging circuit 12, the first discharging circuit 13, the second charging circuit 15, the second discharging circuit 16 and other circuits (that is, whether they are in a working state), It can be realized by the control module in the application processing chip; and the detection of the battery voltage can be realized by the detection module in the application processing chip. Therefore, in some embodiments, based on the charging and discharging circuit 10 shown in Figure 1, referring to Figure 9, the charging and discharging circuit 10 may also include an application processing chip 18, and the application processing chip 18 may include a detection module 181 and a control module. 182; among them,

The detection module 181 is used to detect the voltage of the battery and determine the battery voltage;

The control module 182 is used to control the first charging circuit 12 to be in the working state when the battery voltage is lower than the preset threshold, and/or to control the first discharging circuit 13 to be in the working state.

It should be noted that in this embodiment of the present application, the application processing chip 18 may be an application processing chip in an electronic device, such as an application processor (Application Processor, AP). Here, the detection module 181 and the control module 182 may be integrated in the AP. Among them, the detection module 181 is used to detect the battery voltage of the battery 11; the control module 182 is used to control the first charging circuit 12 and/or the first discharging circuit 13 to be in the working state, and because the first charging circuit 12 and the first discharging circuit 13 The separation can also solve the problem of unstable working mode of the boost circuit caused by simultaneous charging and discharging under low voltage conditions.

Further, in the embodiment of the present application, the control module 182 is also used to selectively turn on the first discharge circuit 13 or the second discharge circuit 16 according to the battery voltage. Specifically, taking the preset threshold value of 3.4V as an example, if the battery voltage is lower than 3.4V, that is, the battery voltage is in a low voltage state. At this time, the first discharge circuit 13 can be controlled to be turned on, so that it is in a working state, and the battery voltage is After step-up conversion, power is provided to the load unit 14; otherwise, if the battery voltage is higher than 3.4V, that is, the battery voltage is in a high-voltage state, at this time, the second discharge circuit 16 can be controlled to be turned on, so that it is in a working state, and the battery voltage is Power is provided directly to the load unit 14.

Further, in the embodiment of the present application, the control module 182 is also used to selectively turn on the first charging circuit 12 or the second charging circuit 15 according to the battery voltage. Specifically, taking the preset threshold value of 3.4V as an example, if the battery voltage is lower than 3.4V, that is, the battery voltage is in a low-voltage state, at this time, the first charging circuit 12 can be controlled to be turned on, so that it is in a working state, and will receive The initial charging voltage is converted into the first charging voltage required by the battery to charge the battery 11; otherwise, if the battery voltage is higher than 3.4V, that is, the battery voltage is in a high-voltage state, at this time, the second charging circuit 15 can be controlled to be turned on to make it In the working state, the received initial charging voltage is converted into the second charging voltage required by the battery to charge the battery 11 . In addition, for situations where the charging power is relatively large, for example, if the charging power provided by the adapter is 9V/2A, the embodiment of the present application can also control the first charging circuit 12 and the second charging circuit 15 to be turned on at the same time, that is, the first charging circuit 12 and the second charging circuit 15 are used at the same time. The charging chip 121 and the second charging chip 122 charge the battery.

Further, in the embodiment of the present application, for the first discharging circuit 13, the control module 182 can specifically control the boost circuit 131 in the first discharging circuit 13. If the boost circuit 131 is controlled to be turned on, it means that When the first discharging circuit 13 is in the working state; if the boost circuit 131 is controlled to be turned off, it means that the first discharging circuit 13 is in the non-working state. For the first charging circuit 12, specifically, the control module 182 can control the first charging chip 121. If the first charging chip 121 is controlled to be turned on, it means that the first charging circuit 12 is in a working state; if the first charging chip 121 is controlled to be turned on, When the chip 121 is turned off, it means that the first charging circuit 12 is in a non-working state. In addition, the control module 182 controls the on or off of the first switching element 151, the second charging chip 122, the charge pump circuit 171, etc.; and the second switching element 172 To turn on or off, the charge pump circuit 171 provides a control signal.

In addition, it should be noted that for the case where the battery voltage is equal to the preset threshold (such as 3.4V), unless otherwise specified, the embodiments of the present application may be consistent with the execution action when the battery voltage is lower than the preset threshold, or It may also be consistent with the execution action when the battery voltage is higher than the preset threshold, and there is no limitation here.

That is to say, the charging and discharging circuit 10 of the embodiment of the present application is a charging and discharging solution for a single-cell silicon anode battery based on a boost circuit. In this charge and discharge circuit 10, it is oriented to a single-cell silicon anode battery and includes a charging and discharging scheme. Here, not only can the discharge voltage of a single-cell silicon anode battery in a low-voltage state (below 3.4V) be increased to above 3.4V, ensuring the normal function and performance of all loads in electronic equipment; but a single cell can also be effectively utilized The capacity density of silicon anode batteries is higher than that of conventional lithium-ion batteries. It achieves higher battery capacity while maintaining the same volume, bringing a better battery life experience to users; in addition, it can also realize charging and discharging paths under low voltage conditions. The separation makes the boost circuit only work in the forward discharge mode, which solves the problem of unstable working mode of the boost circuit due to simultaneous charging and discharging under low voltage, thereby also improving the stability of the charging circuit and reducing the impact on other electronic equipment. Noise interference from the device.

An embodiment of the present application provides a charging and discharging circuit. The charging and discharging circuit includes: a battery, wherein the battery is a single-cell silicon negative electrode battery; a first charging circuit, connected to the battery, is used when the battery voltage of the battery is low. At the preset threshold, the received initial charging voltage is converted into the first charging voltage required by the battery to charge the battery; the first discharge circuit is connected to the battery and the load unit respectively, and is used when the battery voltage of the battery is lower than the predetermined value. When the threshold is set, the battery voltage is boosted and converted to provide power to the load unit; wherein, the first charging circuit is independent of the first discharging circuit. In this way, based on the single-cell silicon anode battery, the battery capacity can be increased and the battery life of the electronic device is increased; and by detecting the battery voltage, when the battery voltage is lower than 3.4V, the first discharge circuit is used to increase the battery voltage. After voltage conversion, it is supplied to the load unit, which can increase the discharge voltage of the battery in the low-voltage state, thereby ensuring the performance of all loads in the electronic device; when the battery voltage is higher than 3.4V, the second discharge circuit is used to directly provide the battery voltage Powering the load unit can also improve the discharge efficiency above 3.4V; in addition, using the first charging circuit that is independent of the first discharging circuit to charge the battery can also realize the separation of the charging circuit and the discharging circuit in the low-voltage state, solving the problem of The instability problem caused by simultaneous charging and discharging under low voltage conditions can also improve the stability of the charging and discharging circuit.

In another embodiment of the present application, based on the charge and discharge circuit 10 described in the previous embodiment, FIG. 10 shows a detailed structural diagram of a charge and discharge circuit 10 provided by the embodiment of the present application. As shown in Figure 10, the charging and discharging circuit 10 may include an overvoltage protection circuit 1001, a main charging chip 1002, an auxiliary charging chip 1003, a boost circuit 1004, a MOS tube 1005, a fast charging switch 1006, a charging charge pump 1007, and application processing. Chip 1008 and battery 1009. Among them, the main charging chip 1002 is the first charging chip in the aforementioned embodiment, the auxiliary charging chip 1003 is the second charging chip in the aforementioned embodiment, and the charging charge pump 1007 is the charge pump circuit in the aforementioned embodiment, and the The charging charge pump can be a 2:1 charging charge pump; the application processing chip 1008 is the AP in the electronic device, which includes a detection module and a control module; the battery 1009 here is a single-cell silicon anode battery.

It should be noted that the control signals of the boost circuit 1004 and the MOS transistor 1005 are provided by the control module in the application processing chip 1008, while the control signals of the fast charging switch 1006 are provided by the charging charge pump 1007. In addition, the control signals of the main charging chip 1002, the auxiliary charging chip 1003, and the charging charge pump 1007 are also provided by the control module in the application processing chip 1008 (not shown in the figure). It should be noted that the control signals and driving signals of the boost circuit 1004 and the MOS tube 1005 are provided by the control module in the application processing chip 1008, and the control of the main charging chip 1002, the auxiliary charging chip 1003, and the charging charge pump 1007 The signal is provided by the control module in the application processing chip 1008, but the driving signal is provided by itself.

In Figure 10, the fast charge path can be marked with a bold solid line; the normal charge path when the battery voltage is less than 3.4V can be marked with a dotted line; the discharge path when the battery voltage is less than 3.4V can be marked with a solid line Mark; for the discharge path when the battery voltage is greater than 3.4V, it can be marked with long and short lines; for the normal charging path when the battery voltage is greater than 3.4V, it can be marked with dotted lines. As can be seen from Figure 9, when the battery voltage is less than 3.4V, the discharge path and the charging path (including the normal charge path and the fast charge path) are separated; while when the battery voltage is greater than 3.4V, the discharge path and the normal charge path are shared. Same path.

It should be noted that in this embodiment of the present application, the input voltage may be VBUS and the system load voltage may be Vsys. Among them, if the input voltage exceeds the OVP threshold, the output of the overvoltage protection circuit 1001 will be turned off, thereby protecting the device from damage due to excessive voltage. In addition, it should be noted that when the input voltage and input current are used to power the system load, if the input current still has a margin, the input current can not only power the system load but also charge the battery 1009 . Alternatively, when the input voltage and input current are used to power the system load, the battery 1009 can also power the system load at the same time.

Here, the technical solution of this embodiment may include a main charging chip, an auxiliary charging chip, a boost circuit, a MOS tube, a charging charge pump, a detection module and a control module in the AP, and a single-cell silicon anode battery. In a specific embodiment, it may include:

(1) AP detects battery voltage in real time;

(2) If the battery voltage is less than 3.4V, the boost circuit is turned on; if the battery voltage is greater than 3.4V, the boost circuit is turned off; thus ensuring that the discharge voltage is always 3.4V or above, solving the problem when the battery voltage is below 3.4V The problem of deterioration in load performance of some systems in electronic equipment;

(3) If the battery voltage is less than 3.4V, the MOS tube is turned off, that is, the MOS tube is turned off; if the battery voltage is greater than 3.4V, the MOS tube is turned on, that is, the MOS tube is turned on; thus, the MOS tube is used when the battery voltage is greater than 3.4V. Non-boost circuit discharge can improve the discharge efficiency above 3.4V;

(4) If the battery voltage is less than 3.4V, the main charging chip turns off the charging function of the internal switch tube (such as the battery switch tube BATFET). During fast charging, a charging charge pump is used, during normal charging, an auxiliary charging chip is used, and during discharging, a charge pump is used. voltage circuit and main charging chip; thus, the charging path and the low-voltage discharge path can be separated in the low-voltage state, so that the boost circuit only works in the forward discharge mode, which solves the problem of simultaneous charging and discharging in the low-voltage state that causes the boost circuit working mode to be inconsistent. stability issues;

(5) If the battery voltage is greater than 3.4V, the charge pump will still be used for fast charging, and the main charging chip will be used for normal charging. In addition, if you need to support 9V/2A charging, you can also use the main charging chip and auxiliary charging at the same time. chip.

In yet another embodiment of the present application, based on the charge and discharge circuit 10 described in the previous embodiment, FIG. 11 shows a detailed structural schematic diagram of another charge and discharge circuit 10 provided by the embodiment of the present application. As shown in FIG. 11 , the charging and discharging circuit 10 may include an overvoltage protection circuit 1101 , a main charging chip 1102 , a boost circuit 1103 , a fast charging switch 1104 , a charging charge pump 1105 , an application processing chip 1106 and a battery 1107 . Among them, as for the main charging chip 1102 and the boost circuit 1103, the main charging chip 1102 is connected in series between the system load terminal and the battery, and the boost circuit 1103 is also directly connected in series between the system load terminal and the battery.

Here, the control signal of the boost circuit 1103 is provided by the control module in the application processing chip 1106, and the control signal of the fast charging switch 1104 is provided by the charging charge pump 1105. In addition, the control signals of the main charging chip 1102 and the charging charge pump 1105 are also provided by the control module in the application processing chip 1106 (not shown in the figure).

It should be noted that in Figure 11, the fast charging path can be marked with a bold solid line; the normal charging path when the battery voltage is less than 3.4V can be marked with a dotted line; the discharge path when the battery voltage is less than 3.4V , can be marked with a solid line; for the discharge path when the battery voltage is greater than 3.4V, it can be marked with long and short lines; for the normal charging path when the battery voltage is greater than 3.4V, it can be marked with dotted lines. It can be seen from Figure 10 that when the battery voltage is less than 3.4V, the discharge path and the charging path (including the normal charge path and the fast charge path) are separated; when the battery voltage is greater than 3.4V, the discharge path and the normal charge path are multiplexed of.

It should also be noted that in the embodiment of the present application, the input voltage may be VBUS and the system load voltage may be Vsys. Among them, the input voltage and input current can be provided by a dedicated charging port (Dedicated Charging Port, DCP), such as 5V/2A. In addition, if the input voltage exceeds the OVP threshold, the output of the overvoltage protection circuit 1101 will be turned off, thereby protecting the device from damage due to excessive voltage.

Here, the technical solution of this embodiment may include a main charging chip, a boost circuit, a charging charge pump, a detection module and a control module in the AP, and a single-cell silicon anode battery. In a specific embodiment, it may include:

(1) AP detects battery voltage in real time;

(2) If the battery voltage is less than 3.4V, the boost circuit is turned on; if the battery voltage is greater than 3.4V, the boost circuit is turned off; thus ensuring that the discharge voltage is always 3.4V or above, solving the problem when the battery voltage is below 3.4V The problem of deteriorating load performance of some systems in electronic equipment; in addition, when the battery voltage is greater than 3.4V, using the BATFET inside the main charging chip instead of the boost circuit to discharge can also improve the discharge efficiency above 3.4V;

(3) Directly connect the output of the boost circuit to the system load terminal, so that the charging path and the low-voltage discharge path can be separated in the low-voltage state, so that the boost circuit only works in the forward discharge mode, solving the problem of simultaneous charging in the low-voltage state. And discharge causes the problem of unstable working mode of the boost circuit.

(4) Under any battery voltage, use the charge pump for fast charging and use the main charging chip for normal charging.

To put it simply, the embodiment of the present application is a charging and discharging solution for a single-cell silicon anode battery based on boost conversion. This can include two sets of charging and discharging schemes (as shown in Figure 10 and Figure 11). The two sets of charging and discharging schemes have the same point: when the battery voltage is less than 3.4V, a boost circuit is used to increase the discharge voltage to 3.4V ( It is called a low-voltage discharge path), and the low-voltage discharge path and the low-voltage charging path are separated, which solves the problem of unstable working mode of the boost circuit caused by simultaneous charging and discharging in a low-voltage state. The difference between these two sets of charging and discharging schemes is: the charging and discharging scheme shown in Figure 10 requires the addition of an auxiliary charging chip and a MOS tube to achieve separation; while the charging and discharging scheme shown in Figure 11 requires the boost circuit The output is connected directly to the system load side for separation.

In yet another embodiment of the present application, based on the charging and discharging circuit 10 described in the previous embodiment, FIG. 12 shows a detailed structural diagram of yet another charging and discharging circuit 10 provided by an embodiment of the present application. As shown in Figure 12, the charging and discharging circuit 10 may include an overvoltage protection circuit 1201, a main charging chip 1202, a boost/bypass circuit 1203, a fast charging switch 1204, a charging charge pump 1205, an application processing chip 1206 and a battery 1207. Among them, for the main charging chip 1202 and the boost/bypass circuit 1203, the boost/bypass circuit 1203 is connected in series between the power supply load terminal above 3.4V and the battery, and the main charging chip 1202 is connected in series between the power supply and the battery. Between V and above the system load terminal other than the powered load and the battery.

Here, the control signal of the boost/bypass circuit 1203 is provided by the control module in the application processing chip 1206, and the control signal of the fast charging switch 1204 is provided by the charging charge pump 1205. In addition, the control signals of the main charging chip 1202 and the charging charge pump 1205 are also provided by the control module in the application processing chip 1206 (not shown in the figure).

It should be noted that the boost circuit used in Figures 10 and 11 is a boost DC-DC circuit; alternatively, a boost-buck DC-DC circuit or a boost/bypass DC-DC circuit can be used. Among them, the functions of the step-up and step-down DC-DC circuit and the step-up/bypass DC-DC circuit are consistent with the step-up DC-DC circuit used in this application, but the cost is higher than the step-up DC-DC circuit used in this application. . In the charge and discharge circuit 10 of FIG. 12 , the boost/bypass circuit 1103 is a boost/bypass DC-DC circuit. Here, when the battery voltage is less than 3.4V, the boost/bypass circuit 1103 is in the boost mode, and the battery voltage is boosted and converted; when the battery voltage is greater than 3.4V, the boost/bypass circuit 1103 is in the bypass mode. In bypass mode, the battery voltage is bypassed.

It should also be noted that for the boost/bypass circuit 1103, considering the power supply capability of a single boost/bypass circuit 1103, if there are many power supply loads above 3.4V, then N boost/bypass circuits can be used here. Bypass circuit 1103, N is an integer greater than or equal to 1.

In this way, in addition to being directly connected to all system loads, the boost circuit shown in Figure 11 can also be considered to be connected to only some system loads that require a voltage above 3.4V, and the remaining system loads are still directly powered by the battery. Specifically, Figure 12 shows a schematic in which the output of the boost/bypass circuit is only connected to part of the system load that requires a voltage above 3.4V, while the remaining part of the system load is still directly powered by the battery.

The embodiment of the present application provides a charging and discharging circuit. This embodiment elaborates on the specific implementation of the foregoing embodiment. According to the technical solution of the foregoing embodiment, it can be seen that the low voltage state (<3.4 The discharge voltage of V)'s single-cell silicon anode battery is increased to above 3.4V, which can ensure the normal function and performance of all loads in electronic equipment, and effectively utilize the higher capacity density characteristics of single-cell silicon anode batteries than conventional lithium-ion batteries. , achieving higher battery capacity while maintaining the same volume, bringing a better battery life experience to users of electronic devices; in addition, it can also realize the separation of low-voltage charging path and low-voltage discharging path, so that the boost circuit only works in the normal state. The forward discharge mode solves the problem of unstable working mode of the boost circuit caused by simultaneous charging and discharging under low voltage conditions, thereby improving the stability of the charging circuit and reducing noise interference to other devices in electronic equipment.

In yet another embodiment of the present application, based on the charge and discharge circuit described in the previous embodiment, FIG. 13 shows a schematic flowchart of a charge and discharge control method provided by the embodiment of the present application. As shown in Figure 13, the method may include:

S1301: Detect the battery voltage of the battery.

S1302: When the battery voltage is lower than the preset threshold, the first charging circuit converts the received initial charging voltage into the first charging voltage required by the battery to charge the battery.

S1303: When the battery voltage is lower than the preset threshold, the battery voltage is boosted and converted through the first discharge circuit and then supplied to the load unit.

It should be noted that in the embodiment of the present application, the battery is a single-cell silicon anode battery. In some embodiments, in order to fully utilize the power of the silicon anode battery, the system of the electronic device can be adjusted, that is, the system software, circuits, etc. of the electronic device need to be improved so that the minimum operating voltage of the system is reduced, for example, to 3.0 V or even below; however, this requires changing the entire system architecture and adjusting the power supply system of electronic equipment, and the application cost is high.

In other embodiments, in order to fully utilize the power of the silicon negative electrode battery, the circuit structure of the charging and discharging circuit can also be adjusted. Specifically, a first discharge circuit is provided in the charge and discharge circuit. When the battery voltage is lower than 3.4V, the battery voltage is boosted through the first discharge circuit and provided to the system load for power supply; thus, not only can the silicon anode battery be It can continue to supply power to the system load when the battery voltage is lower than 3.4V, and it can also solve the problem of poor performance of some loads in electronic equipment when the battery voltage is lower than 3.4V.

It should also be noted that in the embodiment of the present application, due to the separation of the first charging circuit and the first discharging circuit, that is, the first discharging circuit is independent of the first charging circuit, so that when the battery voltage is lower than 3.4V (ie, low voltage state ), it solves the instability problem caused by simultaneous charging and discharging under low voltage conditions.

Further, in the embodiment of the present application, in addition to the first charging circuit and the first discharging circuit, the charging and discharging circuit may also include a detection module and a control module. In some embodiments, the method may further include:

Perform voltage detection on the battery through the detection module to determine the battery voltage;

When the battery voltage is lower than the preset threshold, the control module controls the first charging circuit to be in a working state, and/or controls the first discharging circuit to be in a working state.

Further, in this embodiment of the present application, the first charging circuit may include a first charging chip. In some embodiments, for S1302, when the battery voltage is lower than the preset threshold, converting the received initial charging voltage into the first charging voltage required by the battery through the first charging circuit to charge the battery may include:

When the battery voltage of the battery is lower than the preset threshold and the first charging chip is in a conductive state, the first charging chip converts the initial charging voltage into the first charging voltage required by the battery to charge the battery.

Further, in the embodiment of the present application, the first discharge circuit may include a boost circuit. In some embodiments, for S1303, when the battery voltage is lower than the preset threshold, the battery voltage is boosted and converted through the first discharge circuit to provide power to the load unit, which may include:

When the battery voltage of the battery is lower than the preset threshold and the boost circuit is in a conductive state, the battery voltage is boosted and converted by the boost circuit, and the converted battery voltage is provided to the load unit.

Further, in the embodiment of the present application, the charging and discharging circuit may also include a second charging circuit and a second discharging circuit. In some embodiments, the method may further include:

When the battery voltage of the battery is higher than the preset threshold, the received initial charging voltage is converted into the second charging voltage required by the battery through the second charging circuit to charge the battery;

When the battery voltage of the battery is higher than the preset threshold, the battery voltage is provided to the load unit through the second discharge circuit.

Further, in the embodiment of the present application, the second charging circuit may include the first charging chip, and the second discharging circuit may also include the first charging chip. In this case, the second charging circuit, the second discharging circuit and the first charging circuit are shared. same path. In some embodiments, the method may further include:

When the battery voltage of the battery is higher than the preset threshold and the first charging chip is in the on state, the first charging chip converts the initial charging voltage into the second charging voltage required by the battery to charge the battery; or,

When the battery voltage of the battery is higher than the preset threshold and the first charging chip is in a conductive state, the battery voltage is provided to the load unit through the first charging chip.

Further, in the embodiment of the present application, the second charging circuit may include a first charging chip and a first switching element, and the second discharging circuit may also include a first charging chip and a first switching element. In this case, the second charging circuit, The second discharging circuit and the first charging circuit share the same path. In some embodiments, the method may further include:

When the battery voltage of the battery is higher than the preset threshold and the first charging chip and the first switching element are both in the on state, the initial charging voltage is converted into the second charging voltage required by the battery through the first charging chip and the first switching element. , to charge the battery; or,

When the battery voltage of the battery is higher than the preset threshold and both the first charging chip and the first switching element are in a conductive state, the battery voltage is provided to the load unit through the first charging chip and the first switching element.

Further, in this embodiment of the present application, the load unit may include a first load unit and a second load unit. In some embodiments, the method may further include:

Further, in the embodiment of the present application, the first discharging circuit may include a first charging chip and a boost circuit. At this time, the first charging circuit may include a second charging chip to realize the integration of the first discharging circuit and the first charging circuit. separation. In some embodiments, for S1302 and S1303, the method may also include:

When the battery voltage of the battery is lower than the preset threshold and both the first charging chip and the boost circuit are in the on state, after the battery voltage is boosted and converted by the boost circuit, the converted battery voltage is converted by the first charging chip. Provide power to the load unit;

When the battery voltage of the battery is lower than the preset threshold and the second charging chip is in a conductive state, the second charging chip converts the initial charging voltage into the first charging voltage required by the battery to charge the battery.

Further, in the embodiment of the present application, the charging and discharging circuit may also include a third charging circuit. In some embodiments, the method may further include:

The embodiment of the present application provides a charge and discharge control method, which is a charge and discharge scheme for a single-cell silicon anode battery based on a boost circuit. In this method, it is oriented to single-cell silicon anode batteries and includes charging and discharging schemes. Here, not only can the discharge voltage of a single-cell silicon negative electrode battery in a low-voltage state (below 3.4V) be increased to above 3.4V, ensuring the normal function and performance of all loads in electronic equipment; it can also effectively utilize the single-cell silicon The negative electrode battery has higher capacity density characteristics than conventional lithium-ion batteries, achieving higher battery capacity while maintaining the same volume, providing users with a better battery life experience.

In yet another embodiment of the present application, see FIG. 14 , which shows a schematic structural diagram of an electronic device 140 provided by an embodiment of the present application. As shown in FIG. 14 , the electronic device 140 may include the charge and discharge circuit 10 as described in any of the previous embodiments.

In the embodiment of the present application, the electronic device 140 may also be called a "communication terminal", "intelligent terminal" or "terminal". Examples of the electronic device 140 include, but are not limited to, satellite or cellular telephones; personal communication system (PCS) terminals that may combine cellular radiotelephones with data processing, fax, and data communication capabilities; may include radiotelephones, pagers, Internet/Intranet access, Web browser, planner, calendar, and/or Personal Digital Assistant (PDA); and conventional laptop, palmtop, or other electronic device including a radiotelephone transceiver. In addition, the electronic devices may also include but are not limited to smartphones, e-book readers, smart wearable devices, mobile power supplies (such as power banks, travel chargers), wireless mice, wireless keyboards, wireless headsets, Bluetooth speakers, etc. with charging functions. Rechargeable equipment, there is no specific limit on this here.

In the embodiment of the present application, the electronic device 140 includes the charging and discharging circuit described in the previous embodiment. This charging and discharging circuit is oriented to single-cell silicon negative electrode batteries and includes charging and discharging solutions. In this way, based on the single-cell silicon anode battery, the battery capacity can be increased and the battery life of the electronic device is increased; and by detecting the battery voltage, when the battery voltage is lower than 3.4V, the first discharge circuit is used to increase the battery voltage. After voltage conversion, it is supplied to the load unit, which can increase the discharge voltage of the battery in the low-voltage state, thereby ensuring the performance of all loads in the electronic device; when the battery voltage is higher than 3.4V, the second discharge circuit is used to directly provide the battery voltage Supplying power to the load unit, it can also improve the discharge efficiency above 3.4V; in addition, according to this charge and discharge circuit, the charging path and the discharging path can also be separated in the low voltage state, which solves the problem of voltage rise caused by simultaneous charging and discharging in the low voltage state. The DC-DC working mode of the circuit is unstable.

It should be noted that in this application, the terms "comprising", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements , but also includes other elements not expressly listed or inherent in such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article or apparatus that includes that element.

The above serial numbers of the embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

The methods disclosed in several method embodiments provided in this application can be combined arbitrarily to obtain new method embodiments without conflict.

The features disclosed in several product embodiments provided in this application can be combined arbitrarily without conflict to obtain new product embodiments.

The features disclosed in several method or device embodiments provided in this application can be combined arbitrarily without conflict to obtain new method embodiments or device embodiments.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Industrial applicability

In the embodiment of the present application, the charging and discharging circuit includes: a battery, wherein the battery is a single-cell silicon negative electrode battery; a first charging circuit, connected to the battery, is used to receive a signal when the battery voltage of the battery is lower than a preset threshold. The initial charging voltage is converted into the first charging voltage required by the battery to charge the battery; the first discharge circuit is connected to the battery and the load unit respectively, and is used to increase the battery voltage when the battery voltage is lower than the preset threshold. After voltage conversion, power is provided to the load unit; wherein, the first charging circuit is independent of the first discharging circuit. In this way, based on the single-cell silicon anode battery, the battery capacity can be increased and the battery life of the electronic device is increased; and by detecting the battery voltage, when the battery voltage is lower than the preset threshold (that is, in a low-voltage state), the first The discharge circuit boosts the battery voltage and supplies power to the load unit, which can increase the discharge voltage of the battery in a low-voltage state, thereby ensuring the performance of all loads in the electronic device; and using a first charging circuit that is independent of the first discharge circuit Charging the battery can also realize the separation of the charging circuit and the discharging circuit in the low-voltage state, solving the instability problem caused by simultaneous charging and discharging in the low-voltage state, thereby improving the stability of the charging and discharging circuit.

Claims

A charging and discharging circuit, the charging and discharging circuit includes:

A battery, wherein the battery is a single-cell silicon anode battery;

A first charging circuit, connected to the battery, used to convert the received initial charging voltage into a first charging voltage required by the battery when the battery voltage of the battery is lower than a preset threshold. Charge;

A first discharge circuit is connected to the battery and the load unit respectively, and is used to boost the battery voltage and provide power to the load unit when the battery voltage of the battery is lower than a preset threshold; wherein , the first charging circuit is independent of the first discharging circuit.
The charging and discharging circuit according to claim 1, wherein the first discharging circuit includes a boost circuit, and one end of the boost circuit is connected to the load unit, and the other end of the boost circuit is connected to the battery connection;

The boost circuit is used to boost the battery voltage and convert the converted battery voltage when the battery voltage of the battery is lower than the preset threshold and the boost circuit is in a conductive state. Provide power to the load unit.
The charging and discharging circuit according to claim 2, wherein the first charging circuit includes a first charging chip, and one end of the first charging chip is used to receive the initial charging voltage, and the first charging chip has a The other end is connected to the battery;

The first charging chip is used to convert the initial charging voltage to the desired voltage required by the battery when the battery voltage of the battery is lower than the preset threshold and the first charging chip is in a conductive state. The first charging voltage is used to charge the battery.
The charging and discharging circuit according to claim 3, wherein the charging and discharging circuit further includes a second charging circuit and a second discharging circuit; wherein,

The second charging circuit is connected to the battery and is used to convert the received initial charging voltage into a second charging voltage required by the battery when the battery voltage of the battery is higher than a preset threshold. battery charging;

The second discharge circuit is respectively connected to the battery and the load unit, and is used to provide the battery voltage to the load unit when the battery voltage of the battery is higher than a preset threshold.
The charge and discharge circuit according to claim 4, wherein the second charging circuit includes the first charging chip, and one end of the first charging chip is used to receive the initial charging voltage, and the first charging The other end of the chip is connected to the battery;

The first charging chip is also used to convert the initial charging voltage into a voltage required by the battery when the battery voltage of the battery is higher than the preset threshold and the first charging chip is in a conductive state. The second charging voltage is used to charge the battery.
The charging and discharging circuit of claim 4, wherein the second charging circuit includes the first charging chip and a first switching element, and one end of the first charging chip is used to receive the initial charging voltage, The other end of the first charging chip is connected to one end of the first switching element, and the other end of the first switching element is connected to the battery;

The first charging chip is also used to convert the initial charging voltage when the battery voltage of the battery is higher than a preset threshold and both the first charging chip and the first switching element are in a conductive state. The second charging voltage required by the battery is used to charge the battery.
The charging and discharging circuit according to claim 4, wherein the second discharging circuit includes the first charging chip, and one end of the first charging chip is connected to the load unit, and the first charging chip has a The other end is connected to the battery;

The first charging chip is also used to provide the battery voltage to the load unit when the battery voltage of the battery is higher than the preset threshold and the first charging chip is in a conductive state.
The charge and discharge circuit according to claim 4, wherein the second discharge circuit includes the first charging chip and a first switching element, and one end of the first charging chip is connected to the load unit, and the The other end of the first charging chip is connected to one end of the first switching element, and the other end of the first switching element is connected to the battery;

The first charging chip is also used to change the battery voltage when the battery voltage of the battery is higher than the preset threshold and both the first charging chip and the first switching element are in a conductive state. Provide power to the load unit.
The charge and discharge circuit according to claim 4, wherein the load unit includes a first load unit and a second load unit, and the first discharge circuit is connected to the first load unit, and the second discharge circuit Connected to the second load unit;

The first discharge circuit is also used to boost the battery voltage and provide power to the first load unit when the battery voltage is lower than a preset threshold;

The second discharge circuit is also used to provide the battery voltage to the second load unit when the battery voltage is higher than a preset threshold.
The charging and discharging circuit according to claim 1, wherein the first discharging circuit includes a first charging chip and a boost circuit, and one end of the first charging chip is connected to the load unit, and the first charging circuit The other end of the chip is connected to one end of the boost circuit, and the other end of the boost circuit is connected to the battery;

The first charging chip is used to charge the battery through the boost circuit when the battery voltage of the battery is lower than the preset threshold and both the first charging chip and the boost circuit are in a conductive state. After the battery voltage is boosted and converted, the converted battery voltage is provided to the load unit.
The charging and discharging circuit according to claim 10, wherein the first charging circuit includes a second charging chip, and one end of the second charging chip is used to receive the initial charging voltage, and the second charging chip has a The other end is connected to the battery;

The second charging chip is used to convert the initial charging voltage into the third requirement of the battery when the battery voltage of the battery is lower than a preset threshold and the second charging chip is in a conductive state. A charging voltage to charge the battery.
The charging and discharging circuit according to claim 1, wherein the charging and discharging circuit further includes a third charging circuit, and the third charging circuit is connected to the battery;

The third charging circuit is configured to convert the received initial charging voltage into a third charging voltage required by the battery to charge the battery when the charging speed of the battery is higher than a preset speed threshold.
The charging and discharging circuit according to claim 12, wherein the third charging circuit includes a charge pump circuit and a second switching element, and one end of the second switching element is used to receive the initial charging voltage, and the third The other end of the two switching elements is connected to one end of the charge pump circuit, and the other end of the charge pump circuit is connected to the battery; wherein,

The charge pump circuit is used to convert the initial charging voltage to the predetermined speed threshold when the charging speed of the battery is higher than a preset speed threshold and both the charge pump circuit and the second switching element are in a conductive state. The third charging voltage required by the battery is used to charge the battery.
The charging and discharging circuit according to any one of claims 1 to 13, wherein the charging and discharging circuit further includes a detection module and a control module; wherein,

The detection module is used to perform voltage detection on the battery and determine the battery voltage;

The control module is configured to control the first charging circuit to be in a working state when the battery voltage is lower than a preset threshold, and/or to control the first discharging circuit to be in a working state.
A charge and discharge control method, the method includes:

Detecting the battery voltage of the battery; wherein the battery is a single-cell silicon negative electrode battery;

When the battery voltage is lower than the preset threshold, the first charging circuit converts the received initial charging voltage into the first charging voltage required by the battery to charge the battery;

When the battery voltage is lower than the preset threshold, the battery voltage is boosted and converted through the first discharge circuit and then supplied to the load unit; wherein the first charging circuit is independent of the first discharge circuit.
The method of claim 15, wherein the first discharge circuit includes a boost circuit, the method further comprising:

When the battery voltage is lower than the preset threshold and the boost circuit is in a conductive state, the battery voltage is boosted and converted by the boost circuit, and the converted battery voltage is provided to the load unit. powered by.
The method of claim 15, wherein the method further includes:

When the battery voltage is higher than the preset threshold, convert the received initial charging voltage into the second charging voltage required by the battery through the second charging circuit to charge the battery;

When the battery voltage is higher than the preset threshold, the battery voltage is provided to the load unit through the second discharge circuit.
The method of claim 17, wherein the load unit includes a first load unit and a second load unit, the method further comprising:

When the battery voltage is lower than the preset threshold, the battery voltage is boosted and converted through the first discharge circuit and then supplied to the first load unit;

When the battery voltage is higher than the preset threshold, the battery voltage is provided to the second load unit through the second discharge circuit.
The method of claim 15, wherein the method further includes:

When the charging speed of the battery is higher than the preset speed threshold, the received initial charging voltage is converted into a third charging voltage required by the battery through the third charging circuit to charge the battery.
An electronic device, wherein the electronic device includes the charge and discharge circuit according to any one of claims 1 to 14.