Controllable power supply system of single cell battery and charging method and terminal device thereof

Abstract

The present disclosure relates to a controllable power supply system of a single-cell battery, a charging method thereof and a terminal device. The controllable power supply system of the single-cell battery comprises a charging circuit and a single-cell battery, the single-cell battery comprising a first battery connector, a second battery connector, a first positive electrode lug and a second positive electrode lug; the first battery connector is connected to a first positive electrode tab through the first positive electrode lug, the second battery connector is connected to a second positive electrode tab through the second positive electrode lug, and the input ends of the two battery connectors are connected to the output end of the charging circuit; the charging circuit comprises a step-down module, a charge pump module and a control module; the step-down module and the charge pump module are connected to the input end and the output end of the charging circuit; the control module is used for controlling the step-down module to charge the single-cell battery in a trickle charging stage and a constant voltage charging stage, and controlling the charge pump module to charge the single-cell battery in a constant current charging stage. The controllable power supply system of the single-cell battery can improve the charging efficiency.

Description

Technical Field

[0001] This disclosure relates to the field of battery charging technology, and in particular to a controllable power supply system for a single-cell battery, its charging method, and terminal equipment. Background Technology

[0002] A rechargeable battery is a battery with a limited number of recharge cycles, used in conjunction with a charger. By charging the battery, it can be reused, which helps meet economic and environmental needs. The charging process is the reverse of the discharging process; specifically, it is the process of converting electrical energy into chemical energy stored in the battery.

[0003] Currently, most terminal devices use single-cell batteries for charging. However, a typical single-cell battery includes a set of electrode plates, a set of tabs, and a battery connector. Since the voltage is around 4.5V when the battery is fully charged, the battery connector will overheat significantly when the charging current exceeds 8A. To meet the heat dissipation requirements, the charging power of a typical single-cell battery is around 36W, resulting in low charging efficiency. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this disclosure provides a controllable power supply system for a single-cell battery that can improve charging efficiency, as well as a charging method and terminal equipment thereof.

[0005] In a first aspect, this disclosure provides a controllable power supply system for a single-cell battery, comprising: a charging circuit and a single-cell battery, wherein the output terminal of the charging circuit is connected to the single-cell battery, and the input terminal of the charging circuit is externally connected to an AC / DC adapter;

[0006] The single-cell battery includes: a first battery connector, a second battery connector, a first positive electrode tab, and a second positive electrode tab;

[0007] The output terminal of the first battery connector is connected to the first positive electrode through the first positive tab, and the output terminal of the second battery connector is connected to the second positive electrode through the second positive tab. The input terminals of the first battery connector and the second battery connector are respectively connected to the output terminal of the charging circuit. The first positive tab and the second positive tab are independent of each other.

[0008] The charging circuit includes: a step-down module, a charge pump module, and a control module;

[0009] The input end of the charging circuit is electrically connected with the input end of the voltage reduction module and the input end of the charge pump module respectively, the control module is electrically connected with the control end of the voltage reduction module, the control end of the charge pump module and the single-cell battery respectively, and the output end of the charging circuit is electrically connected with the output end of the voltage reduction module and the output end of the charge pump module respectively.

[0010] The control module is used for controlling the voltage reduction module to charge the single-cell battery in the trickle charging stage, the constant voltage charging stage and the charging cutoff stage, and is used for controlling the charge pump module to charge the single-cell battery in the constant current charging stage, wherein the output current of the charge pump module is greater than the input current, and the output voltage of the charge pump module is less than the input voltage.

[0011] Optionally, the charge pump module comprises N charge pump sub-modules arranged in parallel, wherein N is an integer greater than or equal to 1.

[0012] The control ends of the N charge pump sub-modules are connected with the control module respectively.

[0013] Optionally, the voltage reduction module comprises an input capacitor, an output capacitor, an output inductor, a first switch and a second switch.

[0014] The first end of the first switch is electrically connected with the input end of the charging circuit and the first end of the input capacitor respectively, the second end of the first switch is electrically connected with the first end of the second switch and the first end of the output inductor respectively, the second end of the output inductor is electrically connected with the first end of the output capacitor and the output end of the charging circuit respectively, and the second end of the input capacitor, the second end of the second switch and the second end of the output capacitor are grounded.

[0015] In the charging stage of the output inductor, the first switch is turned on and the second switch is turned off, and in the discharging stage of the output inductor, the first switch is turned off and the second switch is turned on.

[0016] Optionally, the charge pump sub-module comprises a first capacitor, a second capacitor, a third switch, a fourth switch, a fifth switch and a sixth switch.

[0017] The first end of the third switch is connected with the input end of the charging circuit, the second end of the third switch is electrically connected with the first end of the fourth switch and the first end of the first capacitor respectively, the second end of the first capacitor is electrically connected with the first end of the fifth switch and the first end of the sixth switch respectively, the second end of the fourth switch is electrically connected with the second end of the fifth switch, the first end of the second capacitor and the output end of the charging circuit respectively, and the second end of the sixth switch and the second end of the second capacitor are grounded.

[0018] In the capacitor series stage, the third switch and the fifth switch are turned on, and the fourth switch and the sixth switch are turned off; in the capacitor parallel stage, the fourth switch and the sixth switch are turned on, and the third switch and the fifth switch are turned off.

[0019] Optionally, the charge pump sub-module comprises a third capacitor, a fourth capacitor, a fifth capacitor, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a twelfth switch and a thirteenth switch.

[0020] The first end of the seventh switch is connected to the input end of the charging circuit, the second end of the seventh switch is electrically connected to the first end of the eighth switch and the first end of the third capacitor respectively, the second end of the third capacitor is electrically connected to the first end of the ninth switch and the first end of the tenth switch respectively, the second end of the tenth switch is electrically connected to the first end of the eleventh switch and the first end of the fourth capacitor respectively, the second end of the fourth capacitor is electrically connected to the first end of the thirteenth switch and the first end of the twelfth switch respectively, the second end of the eighth switch is electrically connected to the second end of the eleventh switch, the second end of the twelfth switch, the first end of the fifth capacitor and the output end of the charging circuit respectively, the second end of the ninth switch, the second end of the thirteenth switch and the second end of the fifth capacitor are grounded.

[0021] In the capacitor series stage, the seventh switch, the tenth switch and the twelfth switch are turned on, and the eighth switch, the ninth switch, the eleventh switch and the thirteenth switch are turned off.

[0022] In the capacitor parallel stage, the eighth switch, the ninth switch, the eleventh switch and the thirteenth switch are turned on, and the seventh switch, the tenth switch and the twelfth switch are turned off.

[0023] Optionally, the charge pump sub-module comprises a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a fourteenth switch, a fifteenth switch, a sixteenth switch, a seventeenth switch, an eighteenth switch, a nineteenth switch, a twentieth switch, a twenty-first switch, a twenty-second switch and a twenty-third switch.

[0024] The first end of the fourteenth switch is connected to the input end of the charging circuit, the second end of the fourteenth switch is electrically connected to the first end of the fifteenth switch and the first end of the sixth capacitor respectively, the second end of the sixth capacitor is electrically connected to the first end of the sixteenth switch and the first end of the seventeenth switch respectively, the second end of the seventeenth switch is electrically connected to the first end of the eighteenth switch and the first end of the seventh capacitor respectively, the second end of the seventh capacitor is electrically connected to the first end of the nineteenth switch and the first end of the twentieth switch respectively, the second end of the twentieth switch is electrically connected to the first end of the twenty-first switch and the first end of the eighth capacitor respectively, the second end of the eighth capacitor is electrically connected to the first end of the twenty-second switch and the first end of the twenty-third switch respectively, the second end of the fifteenth switch, the second end of the eighteenth switch, the second end of the twenty-first switch, the second end of the twenty-third switch and the first end of the ninth capacitor are connected to the output end of the charging circuit, and the second end of the ninth capacitor, the second end of the sixteenth switch, the second end of the nineteenth switch and the second end of the twenty-second switch are grounded.

[0025] In the capacitor series connection stage, the fourteenth switch, the seventeenth switch, the twentieth switch and the twenty-third switch are turned on, and the fifteenth switch, the sixteenth switch, the eighteenth switch, the nineteenth switch, the twenty-first switch and the twenty-second switch are turned off.

[0026] In the capacitor parallel connection stage, the fifteenth switch, the sixteenth switch, the eighteenth switch, the nineteenth switch, the twenty-first switch and the twenty-second switch are turned on, and the fourteenth switch, the seventeenth switch, the twentieth switch and the twenty-third switch are turned off.

[0027] Optionally, the single-cell battery further comprises a third battery connector and a third positive electrode lug.

[0028] The output end of the third battery connector is connected to a third positive electrode plate through the third positive electrode lug, the input end of the third battery connector is connected to the output end of the charging circuit, and the first positive electrode lug, the second positive electrode lug and the third positive electrode lug are independent of each other.

[0029] In a second aspect, the present disclosure provides a charging method, which is executed by any one of the systems provided in the first aspect, and the method comprises:

[0030] obtaining a charging voltage and a charging current of the single-cell battery;

[0031] determining a charging stage of the single-cell battery according to the charging voltage and the charging current;

[0032] In the trickle charging phase and the constant voltage charging phase, the voltage reduction module is controlled to charge the single-cell battery.

[0033] In the constant current charging phase, the charge pump module is controlled to charge the single-cell battery, wherein the output current of the charge pump module is greater than the input current, and the output voltage of the charge pump module is less than the input voltage.

[0034] Optionally, the determining of the charging phase of the single-cell battery according to the charging voltage and the charging current comprises:

[0035] determining a voltage threshold and a current threshold according to the type of the AC / DC adapter;

[0036] comparing the charging voltage and the charging current with the voltage threshold and the current threshold respectively to determine the charging phase of the single-cell battery.

[0037] In a third aspect, the present disclosure provides a terminal device comprising any of the systems provided in the first aspect or charged by any of the charging methods provided in the second aspect.

[0038] In the technical solution provided by the present disclosure, on one hand, the output end of the charging circuit is connected to the single-cell battery, and the input end of the charging circuit is externally connected to the AC / DC adapter. The single-cell battery comprises a first battery connector, a second battery connector, a first positive electrode lug and a second positive electrode lug. The output end of the first battery connector is connected to the first positive electrode tab through the first positive electrode lug, the output end of the second battery connector is connected to the second positive electrode tab through the second positive electrode lug, the input end of the first battery connector and the input end of the second battery connector are respectively connected to the output end of the charging circuit, the first positive electrode lug and the second positive electrode lug are independent of each other, and the electrical signal output by the AC / DC adapter is divided into two paths after passing through the output end of the charging circuit. One path charges the single-cell battery through the first battery connector, and the other path charges the single-cell battery through the second battery connector. Therefore, the current flowing through the first battery connector and the second battery connector is small, which can reduce the loss of the battery connector, thereby reducing the power loss of the battery during charging and improving the charging efficiency.

[0039] In another aspect, the charging circuit comprises a step-down module, a charge pump module and a control module, the input end of the charging circuit is electrically connected with the input end of the step-down module and the input end of the charge pump module respectively, the control module is electrically connected with the control end of the step-down module, the control end of the charge pump module and the single-cell battery respectively, and the output end of the charging circuit is electrically connected with the output end of the step-down module and the output end of the charge pump module respectively; the control module can control the step-down module to charge the single-cell battery in the trickle charging stage, the constant voltage charging stage and the charging cutoff stage; in the constant current charging stage, the control module controls the charge pump module to charge the single-cell battery, wherein the output current of the charge pump module is greater than the input current, the output voltage of the charge pump module is less than the input voltage, and the charge pump module can realize large-current charging, and since there is no inductor in the charge pump module, i.e. there is no energy loss of the inductor in the charge pump module, the electric energy loss of the charging circuit in the charging process can be reduced, and the charging efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, brief introductions will be given to the drawings needed to be used in the embodiments or prior art descriptions. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without any creative labor.

[0042] Figure 1 A structural schematic diagram of a controllable power supply system of a single-cell battery provided by the present disclosure;

[0043] Figure 2 A structural schematic diagram of another controllable power supply system of a single-cell battery provided by the present disclosure;

[0044] Figure 3 A structural schematic diagram of a step-down module provided by the present disclosure;

[0045] Figure 4 A structural schematic diagram of a charge pump submodule provided by the present disclosure;

[0046] Figure 5 A structural schematic diagram of another charge pump submodule provided by the present disclosure;

[0047] Figure 6 A structural schematic diagram of another charge pump submodule provided by the present disclosure;

[0048] Figure 7 A structural schematic diagram of another controllable power supply system of a single-cell battery provided by the present disclosure;

[0049] Figure 8 A flowchart of a charging method provided by the present disclosure is shown in the following figure;

[0050] Figure 9 A flowchart of another charging method provided by the present disclosure is shown in the following figure;

[0051] Figure 10 A structural diagram of a terminal device provided by the present disclosure is shown in the following figure. DETAILED DESCRIPTION

[0052] In order to enable a more clear understanding of the above-mentioned purposes, features and advantages of the present disclosure, the schemes of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0053] In the following description, many specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the description are only some of the embodiments of the present disclosure, not all the embodiments.

[0054] Figure 1 A structural diagram of a controllable power supply system of a single-cell battery provided by the present disclosure is shown in the following figure, Figure 1 As shown in the figure, the controllable power supply system 10 of the single-cell battery includes a charging circuit 100 and a single-cell battery 200. The output end of the charging circuit 100 is connected to the single-cell battery 200, and the input end of the charging circuit 100 is externally connected to an AC / DC adapter.

[0055] The single-cell battery 200 includes a first battery connector 211, a second battery connector 212, a first positive pole lug 221 and a second positive pole lug 222. The output end of the first battery connector 211 is connected to a first positive pole tab 231 through the first positive pole lug 221, the output end of the second battery connector 212 is connected to a second positive pole tab 232 through the second positive pole lug 222, the input end of the first battery connector 211 and the input end of the second battery connector 212 are respectively connected to the output end of the charging circuit 100, and the first positive pole lug 221 and the second positive pole lug 222 are independent of each other.

[0056] The charging circuit 100 includes a step-down module 110, a charge pump module 120 and a control module 130. The input end of the charging circuit 100 is electrically connected to the input end of the step-down module 110 and the input end of the charge pump module 120, the control module 130 is electrically connected to the control end of the step-down module 110, the control end of the charge pump module 120 and the single-cell battery 200, and the output end of the charging circuit 100 is electrically connected to the output end of the step-down module 110 and the output end of the charge pump module 120.

[0057] The control module 130 is used to control the buck module 110 to charge the single-cell battery 200 during the trickle charging stage, the constant voltage charging stage, and the charging cutoff stage. During the constant current charging stage, the control module 120 is used to charge the single-cell battery 200, wherein the output current of the charge pump module 120 is greater than the input current, and the output voltage of the charge pump module 120 is less than the input voltage.

[0058] Specifically, such as Figure 1 As shown, the single-cell battery 200 includes a first battery connector 211 and a second battery connector 212 connected in parallel. The first battery connector 211 is electrically connected to the first positive electrode 231 via a first positive tab 221, and the second battery connector 212 is electrically connected to the second positive electrode 232 via a second positive tab 222. The first positive electrode 231 and the second positive electrode 232 are independently arranged, that is, a separator is provided between the first positive electrode 231 and the second positive electrode 232, so that the first positive electrode 231 and the second positive electrode 232 do not directly contact each other. The first positive tab 221 is used to connect the first positive electrode 231 and the first battery connector 211, and the second positive tab 222 is used to connect the second positive electrode 232 and the second battery connector 212.

[0059] The electrical signal output from the AC / DC adapter passes through the charging circuit 100 and is output from its output terminal. The output signal of the charging circuit 100 is split into two paths: one path is input to the input terminal of the first battery connector 211, charging the battery cell sequentially through the first battery connector 211, the first positive tab 221, and the first positive electrode plate 231; the other path is input to the input terminal of the second battery connector 212, charging the battery cell sequentially through the second battery connector 212, the second positive tab 222, and the second positive electrode plate 232. This ensures that the current flowing through both the first and second battery connectors 211 and 212 is half the output current of the charging circuit 100, reducing the current flowing through them and minimizing energy loss in the battery connectors. This, in turn, reduces energy loss during charging and improves charging efficiency.

[0060] The charging process of the battery mainly includes four stages: the first stage is the trickle charging stage, which is mainly to pre-charge the fully discharged battery, i.e. the recovery charging. The trickle charging is generally used when the battery voltage of the single cell battery is lower than the trickle charging voltage threshold. With the passage of time, the battery voltage gradually rises. When the battery voltage rises above the trickle charging voltage threshold and the charging current is greater than the trickle charging current threshold, the second stage of charging, i.e. the constant current charging stage, is entered. In the second stage, the constant current charging voltage is generally about ten times the trickle charging voltage. With the continuation of the charging process, the battery voltage gradually rises until it rises to the constant current charging voltage threshold, and the third stage, i.e. the constant voltage charging stage, is entered. In the third stage, with the continuation of the charging process, the charging current gradually decreases until it decreases to the constant voltage charging current threshold, and the third stage is considered to end, and the fourth stage, i.e. the charging cutoff stage, is entered.

[0061] In the trickle charging stage of the single cell battery 200, the control module 130 controls the conduction of the voltage reduction module 110 and the output end of the charging circuit 100, so that the electrical signal output by the AC / DC adapter is output after passing through the voltage reduction module 110, and the single cell battery 200 is charged with a small current.

[0062] In the constant current charging stage of the single cell battery 200, the control module 130 controls the conduction of the charge pump module 120 and the output end of the charging circuit 100, and turns off the voltage reduction module 110 and the output end of the charging circuit 100, so that the electrical signal output by the AC / DC adapter is output after passing through the charge pump module 120, and the single cell battery 200 is charged. The charge pump module 120 plays a role of voltage reduction and current increase on the electrical signal output by the AC / DC adapter, so that the output current of the charge pump module 120 is greater than the input current, and the output voltage is less than the input voltage, realizing the large current charging of the battery. Since there is no inductor in the charge pump module 120, i.e. there is no energy loss of inductor in the charge pump module 120, the electrical energy loss of the charging circuit in the charging process can be reduced.

[0063] In the constant voltage charging stage and the charging cutoff stage of the single cell battery 200, the control module 130 controls the conduction of the voltage reduction module 110 and the output end of the charging circuit 100 again, and disconnects the charge pump module 120 and the output end of the charging circuit 100, so that the electrical signal output by the AC / DC adapter is output after passing through the voltage reduction module 110, and the single cell battery 200 is charged.

[0064] In the embodiment, on the one hand, the single cell battery is connected to the output end of the charging circuit, and the input end of the charging circuit is externally connected to the AC / DC adapter. The single cell battery comprises a first battery connector, a second battery connector, a first positive electrode lug and a second positive electrode lug. The output end of the first battery connector is connected to the first positive electrode tab through the first positive electrode lug, the output end of the second battery connector is connected to the second positive electrode tab through the second positive electrode lug, the input end of the first battery connector and the input end of the second battery connector are respectively connected to the output end of the charging circuit, the first positive electrode lug and the second positive electrode lug are independent of each other, and the electrical signal output by the AC / DC adapter is divided into two paths after passing through the output end of the charging circuit. One path charges the single cell battery through the first battery connector, and the other path charges the single cell battery through the second battery connector. Therefore, the current flowing through the first battery connector and the second battery connector is small, which can reduce the loss of the battery connector, thereby reducing the power loss of the battery during charging and improving the charging efficiency.

[0065] On the other hand, the charging circuit comprises a step-down module, a charge pump module and a control module. The input end of the charging circuit is electrically connected to the input end of the step-down module and the input end of the charge pump module. The control module is electrically connected to the control end of the step-down module, the control end of the charge pump module and the single cell battery. The output end of the charging circuit is electrically connected to the output end of the step-down module and the output end of the charge pump module. The control module can control the step-down module to charge the single cell battery in the trickle charging stage, the constant voltage charging stage and the charging cutoff stage. In the constant current charging stage, the control module controls the charge pump module to charge the single cell battery. The output current of the charge pump module is greater than the input current, and the output voltage of the charge pump module is less than the input voltage. The charge pump module can realize large current charging. Since there is no inductor in the charge pump module, there is no energy loss of the inductor in the charge pump module, thereby reducing the power loss of the charging circuit during charging and improving the charging efficiency.

[0066] Optionally, Figure 2 Another structure schematic diagram of the controllable power supply system of the single cell battery provided by the present disclosure is shown in FIG. 4. Figure 2 As shown in FIG. 4, the charge pump module 120 comprises N charge pump sub-modules 121 arranged in parallel, wherein N≥1 and is an integer.

[0067] The control ends of the N charge pump sub-modules 121 are respectively connected to the control module 130.

[0068] For example, Figure 2As shown, the charge pump module 120 includes three parallel charge pump sub-modules 121. In practical applications, the number of charge pump sub-modules 121 that are turned on can be selected according to the magnitude of the charging current. If the charging current is small, the control module 130 can control any one of the charge pump sub-modules 121 in the charge pump module 120 to be turned on, so that the electrical signal output by the AC / DC adapter charges the single-cell battery 200 through one charge pump sub-module 121. If the charging current is large, the control module 130 can control all three charge pump sub-modules 121 in the charge pump module 120 to be turned on, so that the electrical signal output by the AC / DC adapter charges the single-cell battery 200 through the three parallel charge pump sub-modules 121. This reduces the current passing through a single charge pump sub-module 121, thereby reducing the heat loss of the charge pump module 120 and improving the charging efficiency of the charging circuit 100.

[0069] It should be noted that this embodiment is only an example, showing that the charge pump module 120 includes three charge pump sub-modules 121 connected in parallel. In practical applications, the number of charge pump sub-modules can be flexibly set, and this embodiment does not impose any specific limitations.

[0070] In this embodiment, the charge pump module includes N charge pump sub-modules connected in parallel, where N≥1 and is an integer; the control terminals of the N charge pump sub-modules are respectively connected to the control module, which can flexibly control the number of charge pump sub-modules that are turned on, thereby improving the charging efficiency of the charging circuit.

[0071] Optional, Figure 3 This is a schematic diagram of the structure of a step-down module provided in this disclosure, such as... Figure 3 As shown, the step-down module includes: input capacitor C i Output capacitor C t Output inductor L, first switch K1, and second switch K2.

[0072] The first terminal of the first switch K1 is connected to the input terminal Vin of the charging circuit and the input capacitor C, respectively. i The first terminal is electrically connected, and the second terminal of the first switch K1 is electrically connected to the first terminal of the second switch K2 and the first terminal of the output inductor L, respectively. The second terminal of the output inductor L is electrically connected to the output capacitor C. t The first terminal is electrically connected to the output terminal Vout of the charging circuit, and the input capacitor C i The second terminal, the second terminal of the second switch K2, and the output capacitor C t The second end of each is grounded.

[0073] During the charging phase of the output inductor L, the first switch K1 is turned on and the second switch K2 is turned off; during the discharging phase of the output inductor L, the first switch K1 is turned off and the second switch K2 is turned on.

[0074] Specifically, such asFigure 3 As shown, when the first switch K1 is turned on and the second switch K2 is turned off, the first switch K1, the output inductor L and the single cell battery form a main circuit, and the electrical signal output by the AC / DC adapter is charged to the single cell battery through the first switch K1 and the output inductor L. At this time, the output inductor L is in a charging stage. When the first switch K1 is turned off and the second switch K2 is turned on, the second switch K2, the output inductor L and the single cell battery form a main circuit, and the electrical signal output by the output inductor L is charged to the single cell battery. At this time, the output inductor L is in a discharging state. The output current of the voltage reduction module is adjustable, and the single cell battery can be charged in a non-constant current charging stage to realize variable small current charging.

[0075] Optionally, Figure 4 A structural schematic diagram of a charge pump sub-module is provided for the present disclosure, as shown in Figure 4 As shown, the charge pump sub-module includes a first capacitor C1, a second capacitor C2, a third switch K3, a fourth switch K4, a fifth switch K5 and a sixth switch K6.

[0076] The first end of the third switch K3 is connected to the input end Vin of the charging circuit, the second end of the third switch K3 is electrically connected to the first end of the fourth switch K4 and the first end of the first capacitor C1, the second end of the first capacitor C1 is electrically connected to the first end of the fifth switch K5 and the first end of the sixth switch K6, the second end of the fourth switch K4 is electrically connected to the second end of the fifth switch K5, the first end of the second capacitor C2 and the output end Vout of the charging circuit, and the second end of the sixth switch K6 and the second end of the second capacitor C2 are grounded.

[0077] In the capacitor series stage, the third switch K3 and the fifth switch K5 are turned on, and the fourth switch K4 and the sixth switch K6 are turned off. In the capacitor parallel stage, the fourth switch K4 and the sixth switch K6 are turned on, and the third switch K3 and the fifth switch K5 are turned off.

[0078] For example, the voltage of the electrical signal received by the charge pump sub-module 121 is V, and the current is I. When the charge pump sub-module 121 is in a charging state, the third switch K3 and the fifth switch K5 are turned on, the fourth switch K4 and the sixth switch K6 are turned off, the first capacitor C1 and the second capacitor C2 are connected in series, and the electrical energy is stored in the first capacitor C1 and the second capacitor C2 until the first capacitor C1 and the second capacitor C2 are full. At this time, the voltage of the first capacitor C1 and the second capacitor C2 is V / 2, and the output voltage of the charge pump sub-module 121 is the same as the voltage of the second capacitor C2, i.e. V / 2.

[0079] When the charge pump sub-module 121 is in the discharging state, the fourth switch K4 and the sixth switch K6 are turned on, the third switch K3 and the fifth switch K5 are turned off, the first capacitor C1 and the second capacitor C2 are connected in parallel, the voltage of the first capacitor C1 and the second capacitor C2 is V / 2, and the electrical energy stored in the first capacitor C1 and the second capacitor C2 is gradually released. At this time, the current output by the first capacitor C1 and the second capacitor C2 is the same, and the output current of the charge pump sub-module 121 is the sum of the currents output by the first capacitor C1 and the second capacitor C2, that is, 2I. Therefore, the use of the charge pump sub-module 121 can realize the amplification of the charging power by two times, thereby realizing a larger charging power.

[0080] Optionally, Figure 5 Another structural schematic diagram of a charge pump sub-module is provided for the present disclosure, as shown in Figure 5 The charge pump sub-module 121 includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a seventh switch K7, an eighth switch K8, a ninth switch K9, a tenth switch K10, an eleventh switch K11, a twelfth switch K12, and a thirteenth switch K13.

[0081] The first end of the seventh switch K7 is connected to the input end Vin of the charging circuit, the second end of the seventh switch K7 is electrically connected to the first end of the eighth switch K8 and the first end of the third capacitor C3, the second end of the third capacitor C3 is electrically connected to the first end of the ninth switch K9 and the first end of the tenth switch K10, the second end of the tenth switch K10 is electrically connected to the first end of the eleventh switch K11 and the first end of the fourth capacitor C4, the second end of the fourth capacitor C4 is electrically connected to the first end of the thirteenth switch K13 and the first end of the twelfth switch K12, the second end of the eighth switch K8 is electrically connected to the second end of the eleventh switch K11, the second end of the twelfth switch K12, the first end of the fifth capacitor C5, and the output end Vout of the charging circuit, and the second end of the ninth switch K9, the second end of the thirteenth switch K13, and the second end of the fifth capacitor C5 are all grounded.

[0082] In the capacitor series connection stage, the seventh switch K7, the tenth switch K10, and the twelfth switch K12 are turned on, and the eighth switch K8, the ninth switch K9, the eleventh switch K11, and the thirteenth switch K13 are turned off.

[0083] In the capacitor parallel connection stage, the eighth switch K8, the ninth switch K9, the eleventh switch K11, and the thirteenth switch K13 are turned on, and the seventh switch K7, the tenth switch K10, and the twelfth switch K12 are turned off.

[0084] For example, the voltage of the electrical signal received by the charge pump sub-module 121 is V and the current is I. When the charge pump sub-module 121 is in the charging state, the seventh switch K7, the tenth switch K10 and the twelfth switch K12 are turned on, the eighth switch K8, the ninth switch K9, the eleventh switch K11 and the thirteenth switch K13 are turned off, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are connected in series, and the electrical energy is stored in the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 until the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are fully charged. At this time, the voltage of the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 is V / 3, and the output voltage of the charge pump sub-module 121 is the same as the voltage of the fifth capacitor C5, i.e. V / 3.

[0085] When the charge pump sub-module 121 is in the discharging state, the eighth switch K8, the ninth switch K9, the eleventh switch K11 and the thirteenth switch K13 are turned on, the seventh switch K7, the tenth switch K10 and the twelfth switch K12 are turned off, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel, and the voltage of the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 is V / 3. The electrical energy stored in the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 is gradually released. At this time, the current output by the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 is the same, and the output current of the charge pump sub-module 121 is the sum of the currents output by the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5, i.e. 3I. Therefore, the use of the charge pump sub-module 121 can achieve amplification of three times the charging power, thereby realizing a larger charging power.

[0086] Optionally, Figure 6 Another structure diagram of a charge pump sub-module is provided for the present disclosure, as shown in Figure 6 The charge pump sub-module includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a fourteenth switch K14, a fifteenth switch K15, a sixteenth switch K16, a seventeenth switch K17, an eighteenth switch K18, a nineteenth switch K19, a twentieth switch K20, a twenty-first switch K21, a twenty-second switch K22 and a twenty-third switch K23.

[0087] The first end of the fourteenth switch K14 is connected with the input end Vin of the charging circuit, the second end of the fourteenth switch K14 is electrically connected with the input end of the fifteenth switch K15 and the first end of the sixth capacitor C6 respectively, the second end of the sixth capacitor C6 is electrically connected with the first end of the sixteenth switch K16 and the first end of the seventeenth switch K17 respectively, the second end of the seventeenth switch K17 is electrically connected with the first end of the eighteenth switch K18 and the first end of the seventh capacitor C7 respectively, the second end of the seventh capacitor C7 is electrically connected with the first end of the nineteenth switch K19 and the first end of the twentieth switch K20 respectively, the second end of the twentieth switch K20 is electrically connected with the first end of the twenty-first switch K21 and the first end of the eighth capacitor C8 respectively, the second end of the eighth capacitor C8 is electrically connected with the first end of the twenty-second switch K22 and the first end of the twenty-third switch K23 respectively, the second end of the fifteenth switch K15, the second end of the eighteenth switch K18, the second end of the twenty-first switch K21, the second end of the twenty-third switch K23 and the first end of the ninth capacitor C9 are connected with the output end Vout of the charging circuit, the second end of the ninth capacitor C9, the second end of the sixteenth switch K16, the second end of the nineteenth switch K19 and the second end of the twenty-second switch K22 are grounded.

[0088] In the capacitor series stage, the fourteenth switch K14, the seventeenth switch K17, the twentieth switch K20 and the twenty-third switch K23 are turned on, and the fifteenth switch K15, the sixteenth switch K16, the eighteenth switch K18, the nineteenth switch K19, the twenty-first switch K21 and the twenty-second switch K22 are turned off.

[0089] In the capacitor parallel stage, the fifteenth switch K15, the sixteenth switch K16, the eighteenth switch K18, the nineteenth switch K19, the twenty-first switch K21 and the twenty-second switch K22 are turned on, and the fourteenth switch K14, the seventeenth switch K17, the twentieth switch K20 and the twenty-third switch K23 are turned off.

[0090] For example, the voltage of the electrical signal received by the charge pump sub-module 121 is V, and the current is I. When the charge pump sub-module 121 is in the charging state, the fourteenth switch K14, the seventeenth switch K17, the twentieth switch K20, and the twenty-third switch K23 are turned on, the fifteenth switch K15, the sixteenth switch K16, the eighteenth switch K18, the nineteenth switch K19, the twenty-first switch K21, and the twenty-second switch K22 are turned off, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 are connected in series, the electrical energy is stored in the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9, and the voltage of the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 is V / 4 when the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 are full. At this time, the output voltage of the charge pump sub-module 121 is the same as the voltage of the ninth capacitor C9, that is, V / 4.

[0091] When the charge pump sub-module 121 is in the discharging state, the fifteenth switch K15, the sixteenth switch K16, the eighteenth switch K18, the nineteenth switch K19, the twenty-first switch K21, and the twenty-second switch K22 are turned on, the fourteenth switch K14, the seventeenth switch K17, the twentieth switch K20, and the twenty-third switch K23 are turned off, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 are connected in parallel, and the voltage of the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 is V / 4. The electrical energy stored in the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 is gradually released. At this time, the current output by the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 is the same, and the output current of the charge pump sub-module 121 is the sum of the currents output by the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9, that is, 4I. Therefore, the use of the charge pump sub-module 121 can realize the amplification of four times the charging power, thereby realizing a larger charging power.

[0092] Optionally, Figure 7 Another structure schematic diagram of the controllable power supply system of the single-cell battery provided by the present disclosure is shown in FIG. 6. Figure 7 As shown in FIG. 6, the single-cell battery 200 further includes a third battery connector 213 and a third positive electrode lug 223.

[0093] The output end of the third battery connector 213 is connected to the third positive electrode tab 233 through the third positive electrode lug 223, the input end of the third battery connector 213 is connected to the output end of the charging circuit 100, and the first positive electrode lug 221, the second positive electrode lug 222, and the third positive electrode lug 223 are independent of each other.

[0094] Specifically, as shown in FIG. 6, Figure 7As shown, the single-cell battery 200 includes the first battery connector 211, the second battery connector 212 and the third battery connector 213 in parallel. The third battery connector 213 is electrically connected to the third positive tab 233 through the third positive lug 223. The first positive tab 231, the second positive tab 232 and the third positive lug 223 are independently arranged, that is, an isolation film is arranged between the first positive tab 231 and the second positive tab 232 and between the second positive tab 232 and the third positive lug 223, so that the first positive tab 231, the second positive tab 232 and the third positive tab 233 are not in direct contact with each other. The third positive lug 223 is used to connect the third positive tab 233 and the third battery connector 213.

[0095] The electrical signal at the output end of the charging circuit 100 is divided into three paths. One path of the electrical signal sequentially passes through the first battery connector 211, the first positive lug 221 and the first positive tab 231 to charge the cell. Another path of the electrical signal sequentially passes through the second battery connector 212, the second positive lug 222 and the second positive tab 232 to charge the cell. Another path of the electrical signal sequentially passes through the third battery connector 213, the third positive lug 223 and the third positive tab 233 to charge the battery. The current passing through the first battery connector 211, the second battery connector 212 and the third battery connector 213 is 1 / 3 of the output current of the charging circuit 100, which can reduce the current flowing through each battery connector and reduce the power loss of each battery connector, thereby reducing the power loss of the battery during charging and improving the charging efficiency.

[0096] The present disclosure also provides a charging method, which is executed by the controllable power supply system of the single-cell battery provided in any of the above embodiments.

[0097] Figure 8 A flowchart of a charging method provided by the present disclosure is shown in Figure 8 As shown, the method comprises the following steps:

[0098] S101, acquiring the charging voltage and the charging current of the single-cell battery.

[0099] The charging voltage and the charging current of the single-cell battery are collected in real time. Based on the real-time charging voltage and the real-time charging current of the single-cell battery, the charging stage of the single-cell battery is determined.

[0100] S103, determining the charging stage of the single-cell battery according to the charging voltage and the charging current.

[0101] For example, if the charging voltage is less than the first voltage threshold, it is determined that the single-cell battery is in the trickle charging stage; if the charging voltage is greater than the first voltage threshold and less than the second voltage threshold, it is determined that the single-cell battery is in the constant current charging stage; if the charging voltage is greater than the second voltage threshold and the charging current is greater than the current threshold, it is determined that the single-cell battery is in the constant voltage charging stage; if the charging voltage is greater than the second voltage threshold and the charging current is less than the current threshold, it is determined that the single-cell battery is in the charging cutoff stage.

[0102] In the trickle charging stage and the constant voltage charging stage, the step S1051 controls the voltage reduction module to charge the single-cell battery.

[0103] If it is determined that the single-cell battery is in the trickle charging stage or the constant voltage charging stage, the voltage reduction module is turned on and the charge pump module is turned off, so that the electrical signal charges the single-cell battery through the voltage reduction module. The voltage reduction module can output a small current to realize low-power charging.

[0104] In the constant current charging stage, the step S1052 controls the charge pump module to charge the single-cell battery.

[0105] The output current of the charge pump module is greater than the input current, and the output voltage of the charge pump module is less than the input voltage.

[0106] If it is determined that the single-cell battery is in the constant current charging stage, the charge pump module is turned on and the voltage reduction module is turned off, so that the electrical signal charges the single-cell battery through the charge pump module. The charge pump module can function as a voltage reduction and current increase, so that the output current of the charge pump module is greater than the input current, and the output voltage of the charge pump module is less than the input voltage, thereby realizing high-power charging.

[0107] In this embodiment, the charging voltage and the charging current of the single-cell battery are obtained, the charging stage of the single-cell battery is determined according to the charging voltage and the charging current, the voltage reduction module is controlled to charge the single-cell battery in the trickle charging stage and the constant voltage charging stage, and the charge pump module is controlled to charge the single-cell battery in the constant current charging stage. The output current of the charge pump module is greater than the input current, and the output voltage of the charge pump module is less than the input voltage, so that high-current charging can be realized through the charge pump module. Since there is no inductor in the charge pump module, there is no energy loss of the inductor in the charge pump module, so that the electrical energy loss of the charging circuit in the charging process can be reduced and the charging efficiency can be improved.

[0108] Figure 9 Another charging method provided by the present disclosure is shown in the flowchart, Figure 9 For Figure 8Based on the embodiment shown, the specific description of one possible implementation when S103 is performed is as follows:

[0109] S1031, determining the voltage threshold and the current threshold according to the type of the AC / DC adapter.

[0110] The type of the AC / DC adapter can be a standard downstream port, a dedicated charging port, or a charging downstream port. Different types of AC / DC adapters correspond to different voltage thresholds and current thresholds. Therefore, according to the type of the AC / DC adapter obtained, the corresponding current threshold and voltage threshold can be determined.

[0111] S1032, comparing the charging voltage and the charging current with the voltage threshold and the current threshold respectively to determine the charging stage of the single-cell battery.

[0112] For example, if the charging voltage is less than the first voltage threshold, it is determined that the single-cell battery is in the trickle charging stage; if the charging voltage is greater than the first voltage threshold and less than the second voltage threshold, it is determined that the single-cell battery is in the constant current charging stage; if the charging voltage is greater than the second voltage threshold and the charging current is greater than the current threshold, it is determined that the single-cell battery is in the constant voltage charging stage; if the charging voltage is greater than the second voltage threshold and the charging current is less than the current threshold, it is determined that the single-cell battery is in the charging cutoff stage.

[0113] In this embodiment, by determining the voltage threshold and the current threshold according to the type of the AC / DC adapter, comparing the charging voltage and the charging current with the voltage threshold and the current threshold respectively to determine the charging stage of the single-cell battery, the single-cell battery is charged by different modules in different charging stages, which can improve the charging efficiency in the entire charging process.

[0114] The present disclosure also provides a terminal device comprising the controllable power supply system 10 of any of the single-cell batteries described above or charged by any of the method embodiments described above.

[0115] Figure 10 A structural schematic diagram of a terminal device provided by the present disclosure is shown in Figure 10 As shown, the terminal device 20 comprises the controllable power supply system 10 of the single-cell battery. The terminal device 20 can be charged by any of the charging methods provided in the above embodiments.

[0116] Specifically, as shown in Figure 10 The terminal device 20 comprises a device main body 21, the controllable power supply system 10 of the single-cell battery arranged in the device main body 21, and the electrical signal generated by the charging circuit in the controllable power supply system 10 of the single-cell battery is provided to the single-cell battery, and the terminal device 20 realizes the charging function.

[0117] The terminal device provided by the present disclosure comprises the controllable power supply system of the single-cell battery provided by any of the above embodiments, has the same or similar technical features and technical effects, which will not be described here.

[0118] It should be noted that, in this document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by“comprises a” does not, without more limitations, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0119] The above description is merely one specific implementation of the present disclosure, which enables a person skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A controllable power supply system for a single cell battery, characterized by, include: A charging circuit and a single-cell battery, wherein the output terminal of the charging circuit is connected to the single-cell battery, and the input terminal of the charging circuit is connected to an external AC / DC adapter; The single-cell battery includes: a first battery connector, a second battery connector, a first positive electrode tab, and a second positive electrode tab; The output terminal of the first battery connector is connected to the first positive electrode through the first positive tab, and the output terminal of the second battery connector is connected to the second positive electrode through the second positive tab. The input terminals of the first battery connector and the second battery connector are respectively connected to the output terminal of the charging circuit. The first positive tab and the second positive tab are independent of each other. The charging circuit includes: a step-down module, a charge pump module, and a control module; The input terminal of the charging circuit is electrically connected to the input terminal of the step-down module and the input terminal of the charge pump module, respectively. The control module is electrically connected to the control terminal of the step-down module, the control terminal of the charge pump module, and the single-cell battery, respectively. The output terminal of the charging circuit is electrically connected to the output terminal of the step-down module and the output terminal of the charge pump module, respectively. The control module is used to control the buck module to charge the single-cell battery during the trickle charging stage, the constant voltage charging stage, and the charging cutoff stage; and to control the charge pump module to charge the single-cell battery during the constant current charging stage, wherein the output current of the charge pump module is greater than the input current, and the output voltage of the charge pump module is less than the input voltage.

2. The system of claim 1, wherein, The charge pump module includes N charge pump sub-modules connected in parallel; N ≥ 1 and is an integer; The control terminals of the N charge pump submodules are respectively connected to the control module.

3. The system of claim 1 or 2, wherein, The step-down module includes: an input capacitor, an output capacitor, an output inductor, a first switch, and a second switch; The first terminal of the first switch is electrically connected to the input terminal of the charging circuit and the first terminal of the input capacitor, respectively. The second terminal of the first switch is electrically connected to the first terminal of the second switch and the first terminal of the output inductor, respectively. The second terminal of the output inductor is electrically connected to the first terminal of the output capacitor and the output terminal of the charging circuit, respectively. The second terminal of the input capacitor, the second terminal of the second switch, and the second terminal of the output capacitor are all grounded. During the charging phase of the output inductor, the first switch is turned on and the second switch is turned off; during the discharging phase of the output inductor, the first switch is turned off and the second switch is turned on.

4. The system of claim 2, wherein, The charge pump submodule includes: a first capacitor, a second capacitor, a third switch, a fourth switch, a fifth switch, and a sixth switch; The first end of the third switch is connected to the input end of the charging circuit. The second end of the third switch is electrically connected to the first end of the fourth switch and the first end of the first capacitor. The second end of the first capacitor is electrically connected to the first end of the fifth switch and the first end of the sixth switch. The second end of the fourth switch is electrically connected to the second end of the fifth switch, the first end of the second capacitor, and the output end of the charging circuit. The second end of the sixth switch and the second end of the second capacitor are both grounded. In the capacitor series stage, the third switch and the fifth switch are turned on, and the fourth switch and the sixth switch are turned off; in the capacitor parallel stage, the fourth switch and the sixth switch are turned on, and the third switch and the fifth switch are turned off.

5. The system of claim 2, wherein, The charge pump submodule comprises a third capacitor, a fourth capacitor, a fifth capacitor, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a twelfth switch and a thirteenth switch. The first end of the seventh switch is connected to the input end of the charging circuit, the second end of the seventh switch is electrically connected to the first end of the eighth switch and the first end of the third capacitor respectively, the second end of the third capacitor is electrically connected to the first end of the ninth switch and the first end of the tenth switch respectively, the second end of the tenth switch is electrically connected to the first end of the eleventh switch and the first end of the fourth capacitor respectively, the second end of the fourth capacitor is electrically connected to the first end of the thirteenth switch and the first end of the twelfth switch respectively, the second end of the eighth switch is electrically connected to the second end of the eleventh switch, the second end of the twelfth switch, the first end of the fifth capacitor and the output end of the charging circuit respectively, and the second end of the ninth switch, the second end of the thirteenth switch and the second end of the fifth capacitor are grounded. In the capacitor series stage, the seventh switch, the tenth switch and the twelfth switch are turned on, and the eighth switch, the ninth switch, the eleventh switch and the thirteenth switch are turned off. In the capacitor parallel stage, the eighth switch, the ninth switch, the eleventh switch and the thirteenth switch are turned on, and the seventh switch, the tenth switch and the twelfth switch are turned off.

6. The system of claim 2, wherein, The charge pump submodule comprises a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a fourteenth switch, a fifteenth switch, a sixteenth switch, a seventeenth switch, an eighteenth switch, a nineteenth switch, a twentieth switch, a twenty-first switch, a twenty-second switch and a twenty-third switch. A first end of the fourteenth switch is connected to an input end of the charging circuit, a second end of the fourteenth switch is electrically connected to a first end of the fifteenth switch and a first end of the sixth capacitor respectively, a second end of the sixth capacitor is electrically connected to a first end of the sixteenth switch and a first end of the seventeenth switch respectively, a second end of the seventeenth switch is electrically connected to a first end of the eighteenth switch and a first end of the seventh capacitor respectively, a second end of the seventh capacitor is electrically connected to a first end of the nineteenth switch and a first end of the twentieth switch respectively, a second end of the twentieth switch is electrically connected to a first end of the twenty-first switch and a first end of the eighth capacitor respectively, a second end of the eighth capacitor is electrically connected to a first end of the twenty-second switch and a first end of the twenty-third switch respectively, a second end of the fifteenth switch, a second end of the eighteenth switch, a second end of the twenty-first switch, a second end of the twenty-third switch and a first end of the ninth capacitor are connected to an output end of the charging circuit, a second end of the ninth capacitor, a second end of the sixteenth switch, a second end of the nineteenth switch and a second end of the twenty-second switch are grounded; In the capacitor series connection stage, the fourteenth switch, the seventeenth switch, the twentieth switch and the twenty-third switch are turned on, and the fifteenth switch, the sixteenth switch, the eighteenth switch, the nineteenth switch, the twenty-first switch and the twenty-second switch are turned off; In the capacitor parallel connection stage, the fifteenth switch, the sixteenth switch, the eighteenth switch, the nineteenth switch, the twenty-first switch and the twenty-second switch are turned on, and the fourteenth switch, the seventeenth switch, the twentieth switch and the twenty-third switch are turned off.

7. The system of claim 1 or 2, wherein, The single-cell battery further comprises a third battery connector and a third positive electrode lug; An output end of the third battery connector is connected to a third positive electrode tab through the third positive electrode lug, an input end of the third battery connector is connected to an output end of the charging circuit, and the first positive electrode lug, the second positive electrode lug and the third positive electrode lug are independent of each other.

8. A charging method characterized by, The system of any one of claims 1-7 is executed, and the method comprises: acquiring a charging voltage and a charging current of the single-cell battery; determining a charging stage of the single-cell battery according to the charging voltage and the charging current; controlling the buck module to charge the single-cell battery in the trickle charging stage and the constant voltage charging stage; controlling the charge pump module to charge the single-cell battery in the constant current charging stage, wherein an output current of the charge pump module is greater than an input current, and an output voltage of the charge pump module is less than an input voltage.

9. The charging method according to claim 8, characterized by, The determination of the charging stage of the single-cell battery according to the charging voltage and the charging current comprises: determining a voltage threshold and a current threshold according to a type of the AC / DC adapter; comparing the charging voltage and the charging current with the voltage threshold and the current threshold respectively to determine the charging stage of the single-cell battery.

10. A terminal device, comprising: The system according to any one of claims 1 to 7, or charged using the charging method according to claim 8 or 9.

Images