CN117200371A - Battery charge-discharge circuit, battery charge-discharge control method and electronic equipment - Google Patents

Abstract

The invention discloses a battery charging and discharging circuit, a battery charging and discharging control method and electronic equipment. Wherein, the battery charging and discharging circuit includes: a battery unit, the battery unit includes at least two silicon negative battery cells connected in series; a charge pump, the charge pump is connected to the battery unit and is configured to convert the voltage provided by the battery unit into a first voltage , the first voltage is less than the voltage provided by the battery unit; the charging chip is connected to the charge pump and is configured to output the system supply voltage according to the first voltage; the boosting chip is connected to the charging chip and is configured to operate on the battery When the voltage of the unit is lower than the first preset voltage, the system power supply voltage is boosted and then provided to the load. As a result, the boost chip is used to increase the output voltage when at least two silicon anode battery cells undergo low-voltage discharge through the charge pump and charging chip, so as to meet the load power supply demand and at the same time exert the energy of the silicon anode battery cell during low-voltage discharge. Advantages of high density.

Description

Battery charging and discharging circuit, battery charging and discharging control method and electronic equipment

Technical field

The present invention relates to the technical field of battery power supply, and in particular, to a battery charging and discharging circuit, a battery charging and discharging control method and electronic equipment.

Background technique

With the advancement of science and technology, the demand for high-capacity batteries in electronic equipment, electric vehicles and other products is increasing day by day. Since the energy density of traditional carbon anode lithium batteries is close to the theoretical upper limit, the theoretical energy density of lithium batteries doped with silicon anodes is far higher. Higher than carbon anode lithium batteries, so silicon anode lithium battery technology is developing rapidly.

Due to the material characteristics of the silicon anode lithium battery, it has the advantage of large battery capacity at low voltage. Therefore, the silicon anode lithium battery needs to be discharged to 2.5~3V to effectively utilize the energy density of the silicon anode lithium battery. However, the discharge voltage It cannot meet the power supply needs of some loads, which makes the application of silicon anode lithium batteries have great limitations. In this regard, there are related technologies that use silicon anode lithium batteries and carbon anode lithium batteries in series to jointly supply power to the load, so as to take advantage of the characteristics of silicon anode lithium batteries and improve the overall energy density of the battery. However, this technology only supports dual-cell batteries and requires the use of carbon anode lithium batteries at the same time. Due to the limited performance of carbon anode lithium batteries, the overall energy density of the battery is not greatly improved, and the discharge depth cannot be very low.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art, at least to a certain extent. To this end, the first object of the present invention is to propose a battery charging and discharging circuit that uses a booster chip to increase the output voltage when at least two silicon negative battery cells are discharged at low voltage through a charge pump and a charging chip, so as to satisfy the load. While meeting the power supply demand, the advantages of high energy density of silicon anode battery cells during low-voltage discharge are utilized to improve the continuous power supply capability of the battery unit.

The second object of the present invention is to provide a battery charge and discharge control method.

The third object of the present invention is to provide an electronic device.

In order to achieve the above object, the first embodiment of the present invention proposes a battery charging and discharging circuit, which includes: a battery unit, the battery unit includes at least two silicon negative battery cells connected in series; a charge pump, the charge pump is connected to the battery unit , configured to convert the voltage provided by the battery unit into a first voltage, wherein the first voltage is less than the voltage provided by the battery unit; a charging chip, the charging chip is connected to the charge pump and is configured to output the system supply voltage according to the first voltage; The boost chip is connected to the charging chip and is configured to boost the system power supply voltage and provide it to the load when the voltage of the battery unit is less than the first preset voltage.

According to the battery charging and discharging circuit of the embodiment of the present invention, the voltage provided by at least two silicon negative battery cells connected in series is converted into a first voltage through a charge pump, and the system power supply voltage is output according to the first voltage through the charging chip, and through When the voltage of the battery unit is lower than the first preset voltage, the boost chip boosts the system power supply voltage and provides it to the load. As a result, the boost chip is used to increase the output voltage when at least two silicon anode battery cells undergo low-voltage discharge through the charge pump and charging chip, so as to meet the load power supply demand and at the same time exert the energy of the silicon anode battery cell during low-voltage discharge. The advantage of high density improves the continuous power supply capability of the battery unit.

In order to achieve the above object, the second embodiment of the present invention proposes a battery charge and discharge control method, which is applied to the aforementioned battery charge and discharge circuit. The method includes: in response to the battery unit discharge command, controlling the charge pump to control the voltage provided by the battery unit. Convert to a first voltage, where the first voltage is less than the voltage provided by the battery unit; control the charging chip to output the system power supply voltage according to the first voltage; determine that the voltage of the battery unit is less than the first preset voltage, and control the boost chip to output the system power supply voltage After boosting, it is supplied to the load.

According to the battery charge and discharge control method according to the embodiment of the present invention, the voltage provided by the battery unit is converted into a first voltage, and the charging chip is controlled to output the system supply voltage according to the first voltage, and the boost chip is controlled when the voltage of the battery unit is less than the first voltage. When a preset voltage is reached, the system power supply voltage is boosted and then supplied to the load. As a result, the boost chip is used to increase the output voltage when at least two silicon anode battery cells undergo low-voltage discharge through the charge pump and charging chip, so as to meet the load power supply demand and at the same time exert the energy of the silicon anode battery cell during low-voltage discharge. The advantage of high density improves the continuous power supply capability of the battery unit.

In order to achieve the above object, a third embodiment of the present invention provides an electronic device, including: a load; the aforementioned battery charging and discharging circuit, which is connected to the load and used to supply power to the load; an application processor, which applies processing The device is connected to the battery charging and discharging circuit, and is used to control the battery charging and discharging circuit, so that the battery charging and discharging circuit charges and discharges the battery unit and supplies power to the load.

According to the electronic device according to the embodiment of the present invention, through the aforementioned battery charging and discharging circuit, the boost chip is used to increase the output voltage when at least two silicon negative battery cells are performing low-voltage discharge through the charge pump and the charging chip, so as to meet the load power supply demand. At the same time, it takes advantage of the high energy density of silicon anode battery cells during low-voltage discharge to improve the continuous power supply capability of the battery unit, thereby improving the continuous endurance of electronic equipment.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of the drawings

Figure 1 is a schematic structural diagram of a battery charging and discharging circuit according to an embodiment of the present invention;

Figure 2 is a circuit diagram of a battery charging and discharging circuit according to an embodiment of the present invention;

Figure 3 is a circuit diagram of a battery charging and discharging circuit according to another embodiment of the present invention;

Figure 4 is a flow chart of a battery charge and discharge control method according to an embodiment of the present invention;

Figure 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and are not to be construed as limiting the present invention.

The following describes the battery charging and discharging circuit, battery charging and discharging control method and electronic device proposed by the embodiments of the present invention with reference to the accompanying drawings.

Figure 1 is a schematic structural diagram of a battery charging and discharging circuit according to an embodiment of the present invention. Referring to FIG. 1 , the battery charging and discharging circuit 100 includes: a battery unit 110 , a charge pump 120 , a charging chip 130 and a boosting chip 140 .

Wherein, the battery unit 110 includes at least two silicon anode battery cells connected in series; the charge pump 120 is connected to the battery unit 110 and is configured to convert the voltage provided by the battery unit 110 into a first voltage, wherein the first voltage is less than the battery The voltage provided by the unit 110; the charging chip 130 is connected to the charge pump 120 and is configured to output the system supply voltage according to the first voltage; the boost chip 140 is connected to the charging chip 130 and is configured to operate when the voltage of the battery unit 110 is less than the first preset voltage. When setting the voltage, the system power supply voltage is boosted and supplied to the load.

Specifically, when the battery unit 110 is discharging, the battery unit 110 provides a voltage to the charge pump 120 because the voltage provided by the battery unit 110 is equal to the sum of the voltages of at least two internal series-connected silicon anode battery cells and is higher than the load. The required voltage, therefore, the voltage provided by the battery unit 110 can be first step-down processed by the charge pump 120 to obtain the first voltage, and then the system power supply voltage can be outputted by the charging chip 130 according to the first voltage, wherein, when the battery unit 110 provides When the voltage is less than the first preset voltage, it means that the system power supply voltage output by the charging chip 130 will be less than the voltage required by the load, that is, at least two silicon negative battery cells connected in series are in a low-voltage discharge state. At this time, in order to fully utilize The silicon anode battery cell has the advantage of high energy density at low voltage. The system power supply voltage can be boosted through the boost chip 140 to supply power to the load. This allows the silicon anode battery cell to continue to discharge at low voltage, thereby making full use of the advantage. It takes advantage of the high energy density of silicon anode battery cells at low voltage and improves the ability of the battery unit 110 to continuously supply power.

For example, assume that the battery unit 110 includes two silicon anode battery cells connected in series, and the system supply voltage needs to be above 3.4V. When the battery unit 110 is discharging, the charge pump 120 may first step down the voltage provided by the battery unit 110 to obtain a first voltage, such as the voltage provided by the battery unit 110 whose first voltage is 1/2, and then use the charging chip 130 The system supply voltage is output according to the first voltage. As shown in FIG. 2 , the switch Q2 in the charging chip 130 is turned on to output the system supply voltage. At this time, the system supply voltage is the first voltage. When the voltage of the battery unit 110 is less than At the first preset voltage (twice 3.4V), the system power supply voltage output by the charging chip 130 will be lower than 3.4V. At this time, in order to make full use of the advantage of the silicon anode battery cell's high energy density at low voltage, you can The boost chip 140 boosts the system power supply voltage, for example to 3.5V, to continue supplying power to the load.

It should be noted that the battery unit 110 may also include three, four or even more silicon anode battery cells connected in series, which can be selected according to actual needs and is not limited here.

In the above embodiment, the discharge of the polysilicon anode battery cells is realized through the cooperation of the charge pump and the charging chip. At the same time, the boost chip is used to increase the output voltage when the polysilicon anode battery cells are discharged at low voltage, so as to meet the load power supply demand. At the same time, the advantages of high energy density of silicon anode battery cells during low-voltage discharge are fully utilized to improve the battery's continuous power supply capability.

In some embodiments, as shown in FIG. 2 , the battery charging and discharging circuit 100 further includes: a bypass switch unit 150 , which is connected in parallel with the boost chip 140 and is configured to operate when the voltage of the battery unit 110 is greater than or equal to the third It is turned on when a preset voltage is reached to provide the system power supply voltage to the load.

Specifically, when the battery unit 110 is discharging, the voltage provided by the battery unit 110 may be first step-down processed by the charge pump 120 to obtain the first voltage, and then the system power supply voltage may be output by the charging chip 130 according to the first voltage, where , when the voltage provided by the battery unit 110 is greater than or equal to the first preset voltage, it means that the system power supply voltage output by the charging chip 130 is greater than or equal to the voltage required by the load, that is, at least two silicon negative battery cells connected in series are at non-low voltage. In the discharge state, there is no need to perform voltage boosting at this time, and the system power supply voltage can be directly provided to the load through the bypass switch unit 150 . For example, the bypass switch unit 150 may include a switch Q1. The switch Q1 is connected in parallel with the boost chip 140. When the voltage of the battery unit 110 is greater than or equal to the first preset voltage, the switch Q1 is turned on and the boost chip 140 is stopped. At this time, the system power supply voltage output by the charging chip 130 is directly provided to the load through the switch Q1. Since the bypass switch unit 150 is composed of a single switch tube and has a low impedance, when power is supplied to the load through the bypass switch unit 150, the power supply loss can be reduced to a minimum, thereby improving the power supply efficiency of the battery unit and achieving a high power supply to the load. Efficient power supply.

For example, assume that the battery unit 110 includes two silicon anode battery cells connected in series, and the system supply voltage needs to be above 3.4V. When the battery unit 110 is discharging, the charge pump 120 is first used to step down the voltage provided by the battery unit 110 to obtain a first voltage, such as the voltage provided by the battery unit 110 whose first voltage is 1/2, and then the charging chip 130 is used according to the voltage provided by the battery unit 110 . The first voltage outputs the system supply voltage. For example, the switch Q2 in the charging chip 130 is turned on to output the system supply voltage. At this time, the system supply voltage is the first voltage. When the voltage of the battery unit 110 is greater than or equal to the first preset voltage, (twice 3.4V), the system power supply voltage output by the charging chip 130 will be greater than or equal to 3.4V, which is close to or greater than the voltage required by the load. At this time, the switch Q1 in the bypass switch unit 150 is turned on and the voltage rises. The pressure chip 140 stops working to directly provide the system power supply voltage to the load through the switch Q1.

Therefore, when at least two silicon negative battery cells connected in series are not undergoing low-voltage discharge, a low-resistance power supply path can be provided directly through the bypass switch unit to directly provide the system power supply voltage to the load, thereby reducing voltage transfer. loss, improves the power supply efficiency of the battery unit, and achieves high-efficiency power supply to the load.

In some embodiments, the charging chip 130 is further configured to convert the voltage of the charging power supply into a first charging voltage, and convert the first charging voltage into a second charging voltage through the charge pump 120 to charge the battery unit 110 .

Specifically, as shown in FIG. 2 , when charging the battery unit 110 , the charging chip 130 may first convert the voltage provided by the external charging power source (such as an adapter) into the first charging voltage and output it to the charge pump 120 . Optionally, the charging chip 130 is a conventional buck charging chip, which contains a switch tube Q2. One end of the switch tube Q2 is connected to the voltage output terminal VSYS of the charging chip 130, and the other end of the switch tube Q2 is connected to the charge pump 120. When When the charging chip 130 is connected to an external charging power supply, the charging chip 130 steps down the voltage of the charging power supply to obtain the first charging voltage and outputs it to the voltage output terminal VSYS. At the same time, the switching tube Q2 is controlled to be turned on to pass the first charging voltage through the switch. Tube Q2 passes to charge pump 120. The charge pump 120 converts the first charging voltage, such as boosting the first charging voltage, to obtain a second charging voltage, and provides the second charging voltage to the battery unit 110 to charge the batteries connected in series inside the battery unit 110 . At least two silicon negative battery cells are charged. It should be noted that this charging method is a normal charging method.

As a result, through the cooperation of the charging chip and the charge pump, the normal charging function of the battery unit is realized.

Further, the boost chip 140 is further configured to boost the first charging voltage and provide it to the load when the first charging voltage is less than the first preset voltage. The bypass switch unit 150 is further configured to be turned on when the first charging voltage is greater than or equal to the first preset voltage, so as to provide the first charging voltage to the load.

It should be noted that while the battery unit 110 is charged through an external charging power source, power can also be supplied to the load through the boost chip 140 or the bypass switch unit 150 .

Specifically, as shown in FIG. 2 , when the charging chip 130 is connected to an external charging power supply, the charging chip 130 steps down the voltage of the charging power supply to obtain the first charging voltage and outputs it to the voltage output terminal VSYS. When the battery needs to be When the unit 110 is charging, the switch Q2 is controlled to be turned on to transmit the first charging voltage to the charge pump 120. The charge pump 120 boosts the first charging voltage to obtain a second charging voltage and provides it to the battery unit 110 to charge the battery unit 110. Battery unit 110 is charged. During this process, when the load needs to be powered, if the first charging voltage is less than the first preset voltage, it means that the first charging voltage cannot meet the load power supply demand. At this time, the boost chip 140 outputs the voltage of the charging chip 130 . The first charging voltage is boosted and provided to the load to meet the load power supply demand; if the first charging voltage is greater than or equal to the first preset voltage, it means that the first charging voltage can meet the load power supply demand, and the bypass switch is controlled at this time The switch Q1 in the unit 150 is turned on to directly provide the first charging voltage to the load through the switch Q1.

As a result, through the cooperation of the charging chip, the boost chip and the bypass switch unit, the power supply function to the load is realized.

In some embodiments, the charge pump 120 is a bidirectional charge pump. The bidirectional charge pump is configured to convert the voltage provided by the battery unit 110 according to a first preset ratio when the battery unit 110 is discharging, and to convert the voltage provided by the battery unit 110 according to a first preset ratio when the battery unit 110 is charging. The voltage provided by the charging chip 130 is converted using two preset ratios.

Specifically, since the battery unit 110 is composed of at least two silicon anode battery cells connected in series, the voltage provided by the battery unit 110 is higher relative to the load, and the more silicon anode battery cells are connected in series, the more voltage the battery unit 110 provides. The higher the voltage, so when the battery unit 110 supplies power to the load, the charge pump 120 can first step down the voltage provided by the battery unit 110 according to the first preset ratio to obtain a lower first voltage to satisfy the load. power supply needs.

Similarly, since the battery unit 110 is composed of at least two silicon anode battery cells connected in series, and the more silicon anode battery cells are connected in series, the higher the charging voltage required for the battery unit 110, and the charging chip 130 is a conventional step-down voltage. The first charging voltage output by the charging chip is lower than the charging voltage required by the battery unit 110. Therefore, when charging the battery unit 110, the first charging voltage can be charged according to the second preset ratio through the charge pump 120. Through the voltage boosting process, a higher second charging voltage is obtained to meet the charging voltage requirement of the battery unit 110 .

Further, the first preset ratio and the second preset ratio are determined according to the number of silicon negative electrode battery cells.

Specifically, since the battery unit 110 is composed of at least two silicon anode battery cells connected in series, the voltage of the battery unit 110 is N times the voltage of a single silicon anode battery cell, N is the number of silicon anode battery cells and N ≥ 2, And the voltage increases exponentially as the number N of silicon negative battery cells increases, and the power supply voltage required by the load is a fixed range. Therefore, in order to meet the load power supply demand, the voltage provided by the battery unit 110 can be proportionally scaled. For example, when the cell voltage of a single silicon anode battery meets the power supply voltage required by the load, the first preset ratio can be N:1, that is, the voltage of the battery unit 110 is reduced according to a fixed ratio N:1 to obtain a single silicon anode battery. Cell voltage to match the power supply voltage required by the load.

When charging the battery unit 110, considering that the first charging voltage needs to match the power supply voltage required by the load, and the power supply voltage required by the load is lower than the charging voltage required by the battery unit 110, the first charging voltage needs to be proportionally scaled. For example, when the voltage of a single silicon anode battery cell meets the power supply voltage required by the load, the corresponding first charging voltage matches the voltage of a single silicon anode battery cell, and the required charging voltage of the battery unit 110 is the voltage of a single silicon anode battery cell. N times of , so the second preset ratio may be 1:N, that is, the first charging voltage is boosted according to a fixed ratio of 1:N to match the charging voltage required by the battery unit 110 .

Therefore, by determining the voltage conversion ratio of the charge pump according to the number of silicon anode battery cells, the battery charge and discharge circuit can be compatible with battery units composed of different numbers of silicon anode battery cells connected in series, improving the compatibility of the battery charge and discharge circuit; at the same time , after the silicon negative battery cell of the battery unit is determined, a fixed voltage conversion ratio is adopted, which has high conversion efficiency, thus improving the charging and discharging efficiency of the battery unit.

In some embodiments, as shown in FIG. 3 , the battery charging and discharging circuit 100 further includes: a fast charging path 160 , the fast charging path 160 is connected between the charging power source and the battery unit 110 , and the fast charging path 160 is configured to operate on the charge pump. It is turned on under the control of 120 to directly provide the voltage of the charging power supply to the battery unit 110.

Specifically, referring to FIG. 3 , when the battery unit 110 needs to be quickly charged, the charge pump 120 can directly control the fast charging path 160 to be in a conductive state to directly provide the voltage of the charging power source to the battery unit 110 .

Optionally, the fast charging circuit 160 may include a switch transistor Q3 and a switch transistor Q4 connected back to back. Taking the switch tube Q3 and the switch tube Q4 as MOS tubes as an example, the source of the switch tube Q3 is connected to the charging power supply, the drain of the switch tube Q3 is connected to the drain of the switch tube Q4, and the source of the switch tube Q4 is connected to the battery unit 110 are connected, and the gates of the switching tubes Q3 and Q4 are both connected to the charge pump 120 . When the battery unit 110 needs to be quickly charged, the charge pump 120 controls both the switch tube Q3 and the switch tube Q4 to be turned on, so that the voltage of the charging power source is directly provided to the battery unit 110 to quickly charge the battery unit 110; When the unit 110 is charging normally, the charge pump 120 controls both the switch transistor Q3 and the switch Q4 to be turned off, so that the charging power supply charges the battery unit 110 normally through the path formed by the charging chip 130 and the charge pump 120 .

It should be noted that by using back-to-back design switch tubes, current backflow can be prevented during the charging process, thus protecting the safety of the circuit.

Therefore, the fast charging function of the battery unit can be realized through the fast charging channel.

In some embodiments, the battery charging and discharging circuit 100 also communicates with an application processor, and the application processor is configured to control the boost chip 140 , the bypass switch unit 150 , the charge pump 120 and the charging chip 130 .

That is to say, the charging and discharging of the battery charging and discharging circuit 100 can be uniformly controlled by the application processor.

For example, when receiving a discharge instruction from the battery unit 110, the application processor controls the charge pump 120 to step down the voltage provided by the battery unit 110 to obtain the first voltage, and at the same time communicates with the charging chip 130, so that the charging chip 130 The system supply voltage is output according to the first voltage. For example, the charging chip 130 controls its internal switch Q2 to be in a conductive state. At this time, the system supply voltage is the first voltage. At the same time, the application processor detects the voltage of the battery unit 110. If the voltage is less than At the first preset voltage, the boost chip 140 is controlled to operate to boost the system power supply voltage and supply power to the load; if the voltage is greater than or equal to the first preset voltage, the bypass switch unit 150 is controlled to be turned on, as in The switch Q1 is controlled to be turned on to supply power to the load through the switch Q1.

When the application processor receives a charging instruction from the battery unit 110, if the charging instruction is a normal charging, it communicates with the charging chip 130, so that the charging chip 130 converts the voltage of the charging power source into the first charging voltage, and transmits the voltage to the first charging voltage through the switch. The tube Q2 is provided to the charge pump 120, and the application processor controls the charge pump 120 to convert the first charging voltage into a second charging voltage to charge the battery unit 110. During this process, if the application processor receives the load power supply instruction, the application processor also detects the first charging voltage. If the first charging voltage is less than the first preset voltage, controls the boost chip 140 to operate to charge the first The voltage is boosted to supply power to the load; if the first charging voltage is greater than or equal to the first preset voltage, the bypass switch unit 150 is controlled to be turned on, for example, the switch tube Q1 is controlled to be turned on to supply power to the load through the switch tube Q1. If the charging command is fast charging, the application processor communicates with the charge pump 120, so that the charge pump 120 controls the fast charging path 160 to be turned on, such as controlling the switching tube Q3 and the switching tube Q4 to turn on, so as to directly transfer the voltage of the charging power supply. provided to the battery unit 110. During this process, the load can be powered in the same way as during normal charging.

Optionally, as shown in FIG. 3 , an overvoltage protection module 170 can be added between the charging chip 130 and the charging power supply, and is configured to shut down when the voltage of the charging power supply exceeds the preset voltage threshold, so as to realize the impact of the charging power supply on the battery. During the process of charging the unit 110 and supplying power to the load, overvoltage protection is performed to protect the safety of the charging chip.

Optionally, as shown in Figure 3, a PA (PowerAmplifier, power amplifier), PMIC (Power Management IC, power management integrated circuit), etc. can be added between the boost chip 140 and the load to achieve high-power loads through the PA. power supply, or perform voltage conversion, distribution, etc. again through PMIC to power multiple loads.

In summary, according to the battery charging and discharging circuit according to the embodiment of the present invention, through the cooperation of charge pumps, charging chips, boosting chips and other units, battery units composed of different numbers of silicon negative electrode battery cells can be used to load the load under high voltage conditions. The high-efficiency power supply and power supply under low voltage conditions take advantage of the high energy density of silicon anode battery cells under low voltage conditions, improve the continuous power supply capability of the battery unit to electronic equipment, and at the same time realize the power supply of the battery through the charging power supply. The unit performs charging and powering functions in multiple ways, thereby increasing the versatility and practicality of battery charging and discharging.

In some embodiments, a battery charge and discharge control method is also provided, which is applied to the aforementioned battery charge and discharge circuit.

Figure 4 is a flow chart of a battery charge and discharge control method according to an embodiment of the present invention. Referring to Figure 4, the battery charge and discharge control method includes:

Step S11, in response to the battery unit discharge instruction, control the charge pump to convert the voltage provided by the battery unit into a first voltage, where the first voltage is smaller than the voltage provided by the battery unit.

Step S12: Control the charging chip to output the system supply voltage according to the first voltage.

Step S13: It is determined that the voltage of the battery unit is less than the first preset voltage, and the boost chip is controlled to boost the system power supply voltage and then provide it to the load.

In some embodiments, the battery charge and discharge control method further includes: determining that the voltage of the battery unit is greater than or equal to the first preset voltage, and controlling the bypass switch unit to turn on to provide the system power supply voltage to the load.

In some embodiments, the battery charge and discharge control method further includes: in response to the battery unit charging instruction, controlling the charging chip to convert the voltage of the charging power supply into the first charging voltage, and controlling the charge pump to convert the first charging voltage into the second charging voltage. voltage to charge the battery cells.

In some embodiments, the battery charge and discharge control method further includes: in response to an instruction from the charging power supply to power the load, determining that the first charging voltage is less than the first preset voltage, controlling the boost chip to boost the first charging voltage and then providing it to The load; determines that the first charging voltage is greater than or equal to the first preset voltage, and controls the bypass switch unit to be turned on to provide the first charging voltage to the load.

In some embodiments, the battery charge and discharge control method further includes: in response to the battery unit discharge instruction, controlling the charge pump to convert the voltage provided by the battery unit according to a first preset ratio; in response to the battery unit charging instruction, controlling the charge pump according to The second preset ratio converts the voltage provided by the charging chip, wherein the first preset ratio and the second preset ratio are determined according to the number of silicon negative battery cells in the battery unit.

In some embodiments, the battery charging and discharging control method further includes: in response to the battery unit fast charging instruction, controlling the charge pump to conduct the fast charging path to directly provide the voltage of the charging power supply to the battery unit.

It should be noted that, for the description of the battery charge and discharge control method in this application, please refer to the description of the battery charge and discharge circuit in this application, and the details will not be repeated here.

According to the battery charge and discharge control method according to the embodiment of the present invention, the voltage provided by the battery unit is converted into a first voltage, and the charging chip is controlled to output the system supply voltage according to the first voltage, and the boost chip is controlled when the voltage of the battery unit is less than the first voltage. When a preset voltage is reached, the system power supply voltage is boosted and then supplied to the load. As a result, the boost chip is used to increase the output voltage when at least two silicon anode battery cells undergo low-voltage discharge through the charge pump and charging chip, so as to meet the load power supply demand and at the same time exert the energy of the silicon anode battery cell during low-voltage discharge. The advantage of high density improves the continuous power supply capability of the battery unit.

In some embodiments, an electronic device is also provided.

Referring to Figure 5, the electronic device 1000 includes the aforementioned battery charging and discharging circuit 100, a load 200 and an application processor 300. The battery charging and discharging circuit 200 is connected to the load 100 for supplying power to the load 100; the application processor 300 and The battery charging and discharging circuit 200 is connected to control the battery charging and discharging circuit 100 so that the battery charging and discharging circuit 100 charges and discharges the battery unit and supplies power to the load 200 .

Optionally, the electronic device 1000 can be a mobile phone, a tablet computer, etc., and there are no specific restrictions here.

According to the electronic device according to the embodiment of the present invention, through the aforementioned battery charging and discharging circuit, the boost chip is used to increase the output voltage when at least two silicon negative battery cells are performing low-voltage discharge through the charge pump and the charging chip, so as to meet the load power supply demand. At the same time, it takes advantage of the high energy density of silicon anode battery cells during low-voltage discharge to improve the continuous power supply capability of the battery unit, thereby improving the continuous endurance of electronic equipment.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "an example," "specific examples," or "some examples" or the like means that specific features are described in connection with the embodiment or example. , structures, materials or features are included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated into one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interactive relationship between two elements, unless otherwise specified limitations. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and should not be construed as limitations of the present invention. Those of ordinary skill in the art can make modifications to the above-mentioned embodiments within the scope of the present invention. The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. A battery charge-discharge circuit, comprising:

a battery cell comprising at least two silicon negative electrode battery cells connected in series;

a charge pump coupled to the battery cell and configured to convert a voltage provided by the battery cell to a first voltage, wherein the first voltage is less than the voltage provided by the battery cell;

the charging chip is connected with the charge pump and is configured to output a system supply voltage according to the first voltage;

and the boosting chip is connected with the charging chip and is configured to boost the system supply voltage when the voltage of the battery unit is smaller than a first preset voltage and then provide the system supply voltage to a load.

2. The battery charge and discharge circuit of claim 1, further comprising:

and the bypass switch unit is connected with the boost chip in parallel and is configured to be conducted when the voltage of the battery unit is larger than or equal to a first preset voltage so as to provide the system power supply voltage to a load.

3. The battery charge-discharge circuit of claim 2, wherein the charging chip is further configured to convert a voltage of a charging power source to a first charging voltage and to convert the first charging voltage to a second charging voltage by the charge pump to charge the battery cell.

4. The battery charge-discharge circuit of claim 3, wherein the boost chip is further configured to boost the first charge voltage and provide the boosted first charge voltage to a load when the first charge voltage is less than a first preset voltage.

5. The battery charge-discharge circuit of claim 3, wherein the bypass switch unit is further configured to conduct to provide the first charging voltage to a load when the first charging voltage is greater than or equal to a first preset voltage.

6. The battery charge-discharge circuit of any one of claims 1-5, wherein the charge pump is a bi-directional charge pump configured to convert a voltage provided by the battery cell according to a first preset ratio when the battery cell is discharged and to convert a voltage provided by the charging chip according to a second preset ratio when the battery cell is charged.

7. The battery charge and discharge circuit of claim 6, wherein the first preset ratio and the second preset ratio are determined based on the number of silicon negative battery cells.

8. The battery charge and discharge circuit of claim 3, further comprising:

and a fast charge path connected between the charging power source and the battery cell, the fast charge path being configured to be turned on under control of the charge pump to directly supply a voltage of the charging power source to the battery cell.

9. A battery charge-discharge control method, characterized by being applied to the battery charge-discharge circuit according to any one of claims 1 to 8, comprising:

in response to a battery cell discharging instruction, controlling a charge pump to convert a voltage provided by a battery cell into a first voltage, wherein the first voltage is smaller than the voltage provided by the battery cell;

controlling a charging chip to output a system power supply voltage according to the first voltage;

and determining that the voltage of the battery unit is smaller than a first preset voltage, and controlling the boosting chip to boost the power supply voltage of the system and then provide the power supply voltage to the load.

10. An electronic device, comprising:

a load;

the battery charge-discharge circuit of any one of claims 1-8, connected to the load for powering the load;

the application processor is connected with the battery charging and discharging circuit and used for controlling the battery charging and discharging circuit so that the battery charging and discharging circuit charges and discharges battery units and supplies power to the load.