Double-cell charging circuit, power supply device and electronic equipment

Abstract

The utility model provides a double-cell charging circuit, a power supply device and electronic equipment, and belongs to the technical field of charging and discharging. The double-cell charging circuit comprises a first cell, a second cell, a first adjusting module and a second adjusting module, wherein one end of the first battery cell is connected with the positive bus, the other end of the first battery cell is connected with the negative bus through the first adjusting module, and the first adjusting module is used for adjusting the current of a branch where the first battery cell is located; one end of the second battery cell is connected with the positive bus through a second adjusting module, the other end of the second battery cell is connected with the negative bus, and the second adjusting module is used for adjusting the current of a branch where the second battery cell is located. According to the double-cell charging circuit provided by the invention, the charging current can be better balanced, and the charging stability and the cell utilization rate are ensured.

Description

Technical Field

[0001] This application relates to the field of charging and discharging technology, and more specifically, to a dual-cell charging circuit, a power supply device, and an electronic device. Background Technology

[0002] In order to increase battery capacity, dual-cell batteries are usually used in electronic devices such as mobile phones.

[0003] However, in practical applications, only two cells in the same state can be used together. If cells in different states are used, it may cause an imbalance in the two charging circuits, making it impossible to achieve current balance in the charging circuit and resulting in poor charging stability.

[0004] In view of this, the dual-cell batteries used in related technologies are usually cells in the same state, which leads to the problem of low cell utilization. Utility Model Content

[0005] The purpose of this application is to provide a dual-cell charging circuit, power supply device, and electronic device that can better balance the charging current and ensure charging stability and cell utilization.

[0006] The embodiments of this application are implemented as follows:

[0007] A first aspect of this application provides a dual-cell charging circuit, comprising: a first cell, a second cell, a first adjustment module, and a second adjustment module;

[0008] One end of the first battery cell is connected to the positive bus, and the other end of the first battery cell is connected to the negative bus through the first adjustment module. The first adjustment module is used to adjust the current of the branch where the first battery cell is located.

[0009] One end of the second battery cell is connected to the positive bus via the second adjustment module, and the other end of the second battery cell is connected to the negative bus. The second adjustment module is used to adjust the current in the branch where the second battery cell is located.

[0010] In one embodiment, the first adjustment module includes a first sliding rheostat; the second adjustment module includes a second sliding rheostat; one end of the first sliding rheostat is connected to the negative terminal of the first battery cell, and the other end of the first sliding rheostat is connected to the negative busbar; one end of the second sliding rheostat is connected to the positive busbar, and the other end of the second sliding rheostat is connected to the positive terminal of the second battery cell.

[0011] In one embodiment, the first adjustment module further includes: a first fuel gauge; the first fuel gauge is connected in parallel with a first sliding rheostat, and the control terminal of the first fuel gauge is connected to the control terminal of the first sliding rheostat.

[0012] In one embodiment, the second adjustment module further includes: a second fuel gauge; the second fuel gauge is connected in parallel with the second sliding rheostat, and the control terminal of the second fuel gauge is connected to the control terminal of the second sliding rheostat.

[0013] In one embodiment, the dual-cell charging circuit further includes: a sampling resistor and a protection module; the sampling resistor is disposed on the negative bus; the input terminal of the protection module is connected to the positive bus and the sampling resistor respectively, and the output terminal of the protection module is connected to the negative bus.

[0014] In one embodiment, the protection module includes a detection unit and a circuit breaker unit; the input terminal of the detection unit is connected to the positive bus and the sampling resistor, and the output terminal of the detection unit is connected to the control terminal of the circuit breaker unit. The detection unit is used to acquire the voltage of the positive bus and the voltage of the sampling resistor and send a circuit breaker signal to the circuit breaker unit; the circuit breaker unit is located on the negative bus and is used to disconnect the connection when the circuit breaker signal sent by the detection unit is received.

[0015] In one embodiment, the detection unit includes: a first detection chip and a second detection chip; the input terminal of the first detection chip is connected to the positive bus and ground, and the output terminal of the first detection chip is connected to the circuit breaker unit; the input terminal of the second detection chip is connected to the positive bus and the sampling resistor, and the output terminal of the second detection chip is connected to the circuit breaker unit.

[0016] In one embodiment, the circuit breaking unit includes a first MOSFET and a second MOSFET; the first MOSFET and the second MOSFET are disposed on the negative bus, wherein the control terminal of the first MOSFET is connected to the output terminal of the first detection chip, and the control terminal of the second MOSFET is connected to the output terminal of the second detection chip.

[0017] In another aspect of the embodiments of this application, a power supply device is provided, which includes the above-described dual-cell charging circuit.

[0018] In another aspect of the embodiments of this application, an electronic device is provided, which includes the above-described power supply device or the above-described dual-cell charging circuit.

[0019] The beneficial effects of the embodiments of this application include:

[0020] This application provides a dual-cell charging circuit and electronic device. The dual-cell charging circuit includes a first cell, a second cell, a first adjustment module, and a second adjustment module. One end of the first cell is connected to the positive bus, and the other end is connected to the negative bus via the first adjustment module. The first adjustment module is used to adjust the current in the branch containing the first cell. One end of the second cell is connected to the positive bus via the second adjustment module, and the other end is connected to the negative bus. The second adjustment module is used to adjust the current in the branch containing the second cell. The first adjustment module adjusts the charging current in the branch containing the first cell, and the second adjustment module adjusts the charging current in the branch containing the second cell. Based on these first and second adjustment modules, the charging current in the circuit can be better regulated, ensuring charging balance when charging the first and second cells, improving circuit stability. Furthermore, the adjustments made by the first and second adjustment modules allow for charging regulation of the first and second cells in different states, improving cell utilization. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the dual-cell charging circuit provided in the embodiments of this application;

[0023] Figure 2 This is another schematic diagram of the dual-cell charging circuit provided in the embodiments of this application;

[0024] Figure 3 This is another schematic diagram of the dual-cell charging circuit provided in the embodiments of this application;

[0025] Figure 4 This is another schematic diagram of the dual-cell charging circuit provided in the embodiments of this application;

[0026] Figure 5 This is another schematic diagram of the dual-cell charging circuit provided in the embodiments of this application;

[0027] Figure 6 This is another schematic diagram of the dual-cell charging circuit provided in the embodiments of this application;

[0028] Figure 7This is a schematic diagram of the overall structure of the dual-cell charging circuit provided in the embodiments of this application;

[0029] Figure 8 This is a schematic diagram illustrating the current regulation process of the dual-cell charging circuit provided in this application embodiment.

[0030] Labels: 100-First battery cell; 200-Second battery cell; 300-First adjustment module; 310-First sliding rheostat; 320-First fuel gauge; 400-Second adjustment module; 410-Second sliding rheostat; 420-Second fuel gauge; RS1-Sampling resistor; 500-Protection module; 510-Detection unit; 511-First detection chip; 512-Second detection chip; 520-Circuit breaker unit; 521-First MOSFET; 522-Second MOSFET. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this application, it should be noted that the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In order to increase battery capacity, dual-cell batteries are usually used in electronic devices such as mobile phones.

[0037] However, in practical applications, only two cells in the same state can be used together. If cells in different states are used, it may cause an imbalance in the two charging circuits, making it impossible to achieve current balance in the charging circuit and resulting in poor charging stability.

[0038] In this context, "same state" refers to two battery cells having the same attributes, such as internal resistance and other related parameters. If all these related parameters are the same, it can be determined that the two battery cells are in the same state. If any parameter is different, it can be determined that the two battery cells are in different states.

[0039] For battery cells in different states, due to the difference in internal resistance, the temperature rise will change accordingly during the constant voltage and constant current charging and discharging process, resulting in different internal and circuit impedances of the battery cells, making it difficult to ensure that the current deviation between the two battery cells is within the control range.

[0040] In view of this, the dual-cell batteries used in related technologies are usually cells in the same state, which leads to low cell utilization.

[0041] To address the aforementioned problems in related technologies, this application provides a dual-cell charging circuit. The specific structure and working principle of the dual-cell charging circuit provided in this application will be explained below.

[0042] Figure 1 Please refer to the schematic diagram of the dual-cell charging circuit provided in the embodiments of this application. Figure 1 The dual-cell charging circuit includes: a first cell 100, a second cell 200, a first adjustment module 300, and a second adjustment module 400.

[0043] It should be noted that the first cell 100 and the second cell 200 can be cells in a lithium battery. A lithium battery cell refers to the basic unit inside a battery used to store electrical energy. In lithium batteries, a cell typically refers to a single lithium-ion battery cell.

[0044] Optionally, the battery cell mainly consists of a positive electrode material, a negative electrode material, an electrolyte, and a separator. The positive electrode material can be lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide, etc., while the negative electrode material is usually graphite or silicon-based material. The electrolyte is a mixture of lithium salt and organic solvent, used to conduct lithium ions between the positive and negative electrodes.

[0045] Optionally, battery cells can be categorized into three types: cylindrical, prismatic, and pouch (polymer). Different cell shapes have different application scenarios and advantages / disadvantages. Cylindrical cells have better mechanical strength but relatively lower energy density. Prismatic cells can be customized in size as needed, offering strong adaptability, but consistency control is more difficult. Pouch cells offer higher energy density and flexibility, but relatively weaker mechanical strength.

[0046] The first battery cell 100 and the second battery cell 200 can be selected according to actual usage requirements. They can be lithium battery cells made of any of the above materials or in any shape, and no specific restrictions are imposed here.

[0047] Optionally, the first adjustment module 300 and the second adjustment module 400 can be circuit modules used to adjust the current of each branch in the circuit. The adjustment of the current in each branch can be achieved by combining circuit elements such as adjusting resistors and adjusting capacitors.

[0048] In this configuration, one end of the first battery cell 100 is connected to the positive bus, and the other end of the first battery cell 100 is connected to the negative bus through the first adjustment module 300; one end of the second battery cell 200 is connected to the positive bus through the second adjustment module 400, and the other end of the second battery cell 200 is connected to the negative bus.

[0049] Optionally, the current in the branch where the first battery cell 100 is located can be adjusted by the first adjustment module 300, and the current in the branch where the second battery cell 200 is located can be adjusted by the second adjustment module 400.

[0050] In practical applications, adjusting the current on the two branches through the first and second adjustment modules can maintain the charging balance of the two branches, thereby ensuring the stability of dual-cell charging.

[0051] The following explains the working process of the dual-cell charging circuit provided in the embodiments of this application:

[0052] During the charging process, voltage can be provided by the positive and negative busbars. The first battery cell 100 and the second battery cell 200 can be used as charging devices. During the charging process, if the current in the branch where the first battery cell 100 is located is large, it can be adjusted by the first adjustment module 300 to reduce the current in the branch where the first battery cell 100 is located. Correspondingly, if the current in the branch where the second battery cell 200 is located is large, it can be adjusted by the second adjustment module 400 to reduce the current in the branch where the second battery cell 200 is located. By adjusting the current in the circuit through the first adjustment module 300 and the second adjustment module 400, the current in the branch where the first battery cell 100 is located and the branch where the second battery cell 200 is located can be kept in balance, thereby improving the stability of the circuit charging.

[0053] This application provides a dual-cell charging circuit and electronic device. The dual-cell charging circuit includes a first cell, a second cell, a first adjustment module, and a second adjustment module. One end of the first cell is connected to the positive bus, and the other end is connected to the negative bus via the first adjustment module. The first adjustment module is used to adjust the current in the branch containing the first cell. One end of the second cell is connected to the positive bus via the second adjustment module, and the other end is connected to the negative bus. The second adjustment module is used to adjust the current in the branch containing the second cell. The first adjustment module adjusts the charging current in the branch containing the first cell, and the second adjustment module adjusts the charging current in the branch containing the second cell. Based on these first and second adjustment modules, the charging current in the circuit can be better regulated, ensuring charging balance when charging the first and second cells, improving circuit stability. Furthermore, the adjustments made by the first and second adjustment modules allow for charging regulation of the first and second cells in different states, improving cell utilization.

[0054] In the embodiments of this application, for example, fresh cells with DCR (Direct Current Resistance) close to the upper and lower limits can be connected in parallel, fresh cells can be connected in parallel with 60°C storage cells, and fresh cells can be connected in parallel with 60°C cycle cells. For these cells in different states, it is only necessary to keep the capacity and nominal voltage consistent. The difference in their internal resistance can be adjusted by the adjustment module. Therefore, when selecting cells for parallel connection, it is no longer necessary to strictly select cells in the same state. Cells in different states can also make the battery utilization rate higher.

[0055] Furthermore, if two battery cells in different states are used during charging, the impedance of the branches containing the first and second cells will differ. The current in one branch will be greater than the current in the other. The branch with the higher current will cause the cells in that branch to reach full charge first, while the branch with the lower current will cause the cells that were initially fully charged to discharge and reach full charge themselves. This accelerates the degradation of the dual-cell system and shortens its lifespan. The first and second adjustment modules can adjust the circuit impedance, thus preventing this situation from occurring.

[0056] In addition, by adjusting the impedance of the circuit, not only can cells in different states be used, but the charging current of each branch can also be kept within the error range, so that each cell can reach full charge at the same time, thus preventing the lifespan of the cells from being shortened too quickly.

[0057] To better understand the dual-cell charging circuit provided in this embodiment, the specific structure of the two adjustment modules in the dual-cell charging circuit will be explained in detail below.

[0058] Figure 2 For another structural schematic diagram of the dual-cell charging circuit provided in the embodiments of this application, please refer to... Figure 2 The first adjustment module includes a first sliding rheostat 310; the second adjustment module includes a second sliding rheostat 410; one end of the first sliding rheostat 310 is connected to the negative terminal of the first battery cell 100, and the other end of the first sliding rheostat 310 is connected to the negative busbar; one end of the second sliding rheostat 410 is connected to the positive busbar, and the other end of the second sliding rheostat 410 is connected to the positive terminal of the second battery cell 200.

[0059] Optionally, during the impedance adjustment process through each adjustment module, a sliding rheostat can be used. Specifically, the first adjustment module can be adjusted using a first sliding rheostat 310, and the second adjustment module can be adjusted using a second sliding rheostat 410.

[0060] In one embodiment, the impedance of the sliding rheostat can be changed by adjusting the control terminal of the sliding rheostat, thereby achieving impedance adjustment in the corresponding branch.

[0061] For example, if it is necessary to increase the impedance of a certain branch, the sliding rheostat of that branch can be adjusted to increase the impedance of the sliding rheostat, thereby increasing the impedance of that branch. Conversely, if it is necessary to decrease the impedance of a certain branch, the sliding rheostat of that branch can be adjusted to decrease the impedance of the sliding rheostat, thereby decreasing the impedance of that branch.

[0062] In practical applications, the impedance of the branch containing the first battery cell can be adjusted by the first sliding rheostat 310, and the impedance of the branch containing the second battery cell can be adjusted by the second sliding rheostat 410.

[0063] In the dual-cell charging circuit provided in this embodiment, the first adjustment module includes a first sliding rheostat; the second adjustment module includes a second sliding rheostat; one end of the first sliding rheostat is connected to the negative terminal of the first cell, and the other end of the first sliding rheostat is connected to the negative busbar; one end of the second sliding rheostat is connected to the positive busbar, and the other end of the second sliding rheostat is connected to the positive terminal of the second cell. The sliding rheostat allows for more accurate and rapid adjustment of the impedance on the corresponding branch, improving adjustment efficiency.

[0064] It should be noted that in practical applications, in addition to the sliding rheostat mentioned above, other adjustable resistors, variable resistance boxes, and other electronic devices that can achieve impedance adjustment can also be used. No specific restrictions are imposed here, and one type of electronic component can be selected for impedance adjustment according to actual needs.

[0065] The following explains another possible structure of the two adjustment modules provided in the embodiments of this application.

[0066] Figure 3 For another structural schematic diagram of the dual-cell charging circuit provided in the embodiments of this application, please refer to... Figure 3 The first adjustment module further includes: a first fuel gauge 320; the control terminal of the first fuel gauge is connected to the control terminal of the first sliding rheostat 310. The second adjustment module further includes: a second fuel gauge 420; the control terminal of the second fuel gauge is connected to the control terminal of the second sliding rheostat 410.

[0067] It should be noted that the first fuel gauge 320 is connected in parallel with the first sliding rheostat 310. The first fuel gauge 320 can obtain the voltage of the first sliding rheostat 310 and the branch where the first battery cell 100 is located, and can adjust the impedance of the first sliding rheostat 310 through the control terminal, thereby realizing the adjustment of the impedance of the branch where the first battery cell 100 is located.

[0068] The second fuel gauge 420 is connected in parallel with the second sliding rheostat 410. The second fuel gauge 420 can obtain the voltage of the branch where the second sliding rheostat 410 and the second battery cell 200 are located, and can adjust the impedance of the second sliding rheostat 410 through the control terminal, thereby realizing the adjustment of the impedance of the branch where the second battery cell 200 is located.

[0069] Alternatively, the current in the two branches can be controlled by adjusting the branch impedance. The specific calculation formula is as follows:

[0070]

[0071]

[0072] Wherein, I1 is the current in the branch where the first battery cell 100 is located, I2 is the current in the branch where the second battery cell 200 is located, U3 is the voltage detected by the first fuel gauge 320, U4 is the voltage detected by the second fuel gauge 420, ΔR1 is the resistance of the first sliding rheostat, and ΔR2 is the resistance of the second sliding rheostat.

[0073] It should be noted that U3 and U4 are detected values, while ΔR1 and ΔR2 are adjustable values. In order to ensure that the currents I1 and I2 of the two branches can be controlled within the error range, ΔR1 and ΔR2 can be adjusted after U3 and U4 are detected, so that I1 and I2 can be controlled.

[0074] In one embodiment, the other end of the first fuel gauge 320 can be connected to the positive bus, and correspondingly, the other end of the second fuel gauge 420 can also be connected to the positive bus.

[0075] In the dual-cell charging circuit provided in this embodiment, the first adjustment module further includes: a first fuel gauge; the first fuel gauge is connected in parallel with a first sliding rheostat, and the control terminal of the first fuel gauge is connected to the control terminal of the first sliding rheostat; the second adjustment module further includes: a second fuel gauge; the second fuel gauge is connected in parallel with a second sliding rheostat, and the control terminal of the second fuel gauge is connected to the control terminal of the second sliding rheostat. The first and second fuel gauges allow for a more accurate determination of the voltage of the two branches, thereby enabling more precise adjustment of the resistance value of the corresponding sliding rheostat, and ultimately regulating the current in each branch.

[0076] The following explains another possible structure of the dual-cell charging circuit provided in the embodiments of this application.

[0077] Figure 4 For another structural schematic diagram of the dual-cell charging circuit provided in the embodiments of this application, please refer to... Figure 4 The dual-cell charging circuit also includes: a sampling resistor RS1 and a protection module 500; the sampling resistor RS1 is set on the negative bus; the input terminal of the protection module 500 is connected to the positive bus and the sampling resistor RS1 respectively, and the output terminal of the protection module 500 is connected to the negative bus.

[0078] It should be noted that the sampling resistor RS1 can be a resistor used for current detection. The current in the circuit where the sampling resistor RS1 is located can be detected to determine whether the current circuit needs to be protected by the protection module. For example, if the detected current is greater than a preset threshold, it can be determined that there is a certain safety hazard in the current circuit, and the circuit can be protected by disconnecting the circuit through the protection module.

[0079] Optionally, the sampling resistor RS1 can be any possible precision resistor, and this application embodiment does not limit this.

[0080] It should be noted that the protection module can determine whether the protection circuit needs to be disconnected based on the current value of the circuit where the sampling resistor RS1 is located.

[0081] In the dual-cell charging circuit provided in this embodiment, the sampling resistor is located on the negative bus. The input terminal of the protection module is connected to both the positive bus and the sampling resistor, and the output terminal of the protection module is connected to the negative bus. The protection module can detect the current in the circuit containing the sampling resistor, thereby protecting the entire circuit and improving its safety.

[0082] The specific structure of the protection module in the dual-cell charging circuit provided in this application embodiment will be explained in detail below.

[0083] Figure 5 For another structural schematic diagram of the dual-cell charging circuit provided in the embodiments of this application, please refer to... Figure 5 The protection module includes a detection unit 510 and a circuit breaker unit 520. The input terminal of the detection unit 510 is connected to the positive bus and the sampling resistor RS1, and the output terminal of the detection unit 510 is connected to the control terminal of the circuit breaker unit 520. The detection unit 510 is used to acquire the voltage of the positive bus and the voltage of the sampling resistor RS1 and send a circuit breaker signal to the circuit breaker unit 520. The circuit breaker unit 520 is located on the negative bus and is used to disconnect the connection when it receives the circuit breaker signal sent by the detection unit 510.

[0084] It should be noted that the detection unit 510 can be a detection chip, which can obtain the voltage across the sampling resistor and then calculate the corresponding current based on the resistance value of the sampling resistor. Thus, when the current is greater than a preset threshold, a circuit breaker signal can be generated and the circuit breaker unit 520 can be controlled to open.

[0085] Optionally, the circuit breaker unit 520 can be a semiconductor device that can be in a normal conducting state when no circuit breaker signal is received, and can disconnect the circuit after receiving a circuit breaker signal.

[0086] Optionally, in actual implementation, the voltage across the sampling resistor can be determined by the detection unit, and it can be determined whether the current in the circuit where the sampling resistor is located is greater than a preset threshold. If so, a circuit breaker signal can be generated to control the circuit breaker unit to disconnect; otherwise, the detection can continue.

[0087] In the dual-cell charging circuit provided in this embodiment, the protection module includes a detection unit and a circuit breaker unit. The input terminal of the detection unit is connected to the positive bus and a sampling resistor, and the output terminal of the detection unit is connected to the control terminal of the circuit breaker unit. The detection unit is used to acquire the voltage of the positive bus and the voltage of the sampling resistor and send a circuit breaker signal to the circuit breaker unit. The circuit breaker unit is located on the negative bus and is used to disconnect the circuit upon receiving the circuit breaker signal from the detection unit. By cooperating with the detection module and the circuit breaker module, it is possible to more accurately determine whether the current in the circuit exceeds a preset threshold, thereby enabling more accurate and rapid protection of the circuit.

[0088] The actual structure of the detection module provided in the embodiments of this application will be explained in detail below.

[0089] Figure 6 For another structural schematic diagram of the dual-cell charging circuit provided in the embodiments of this application, please refer to... Figure 6 The detection unit includes a first detection chip 511 and a second detection chip 512; the input terminal of the first detection chip 511 is connected to the positive bus and ground, and the output terminal of the first detection chip 511 is connected to the circuit breaker unit 520; the input terminal of the second detection chip 512 is connected to the positive bus and the sampling resistor RS1, and the output terminal of the second detection chip 512 is connected to the circuit breaker unit 520.

[0090] It should be noted that both the first detection chip 511 and the second detection chip 512 can be IC (Integrated Circuit) chips, which can take two voltage values ​​as input and output a level signal as output.

[0091] For example, the input terminal of the first detection chip 511 can be the voltage of the positive bus and the voltage of ground. The voltage difference can be calculated, and the current in the circuit can be calculated based on the voltage difference and the resistance value of the sampling resistor RS1. If the current is greater than a preset threshold, an open circuit signal can be generated.

[0092] It should be noted that the circuit breaker signal can be an electrical level signal. If the current determined by the first detection chip 511 does not exceed the preset threshold, both the CO pin and the DO pin of the first detection chip 511 can output a high level, which can keep the circuit breaker unit conducting. After the first detection chip 511 determines that the current exceeds the preset threshold, the CO pin of the first detection chip 511 can output a low level, and the DO pin continues to output a high level. In this case, the circuit breaker unit can be disconnected.

[0093] For example, the input terminal of the second detection chip 512 can be the voltage of the positive bus and the voltage of the sampling resistor RS1. The voltage difference can be calculated, and the current in the circuit can be calculated based on the voltage difference and the resistance value of the sampling resistor RS1. If the current is greater than a preset threshold, an open circuit signal can be generated.

[0094] It should be noted that the circuit breaker signal can be an electrical level signal. If the current determined by the second detection chip 512 does not exceed the preset threshold, both the CO pin and DO pin of the second detection chip 512 can output a high level, which can keep the circuit breaker unit conducting. After the second detection chip 512 determines that the current exceeds the preset threshold, the CO pin of the second detection chip 512 can output a low level, and the DO pin continues to output a high level. In this case, the circuit breaker unit can be disconnected.

[0095] Accordingly, in order to satisfy the structure of the detection unit mentioned above, the structure of the circuit breaker unit can also be set in two parts. The structure of the circuit breaker unit provided in the embodiment of this application will be explained below.

[0096] Optionally, the circuit breaking unit includes: a first MOSFET 521 and a second MOSFET 522; the first MOSFET 521 and the second MOSFET 522 are disposed on the negative bus, wherein the control terminal of the first MOSFET 521 is connected to the output terminal of the first detection chip 511, and the control terminal of the second MOSFET 522 is connected to the output terminal of the second detection chip 512.

[0097] It should be noted that both the first MOSFET 521 and the second MOSFET 522 can be a type of field-effect transistor. The MOSFET can remain on when it receives two high-level signals, and will be off when it receives one low-level signal and one high-level signal.

[0098] For example, if both the CO and DO pins of the first detection chip 511 can output a high level, the first MOSFET 521 can remain on; if the CO pin of the first detection chip 511 outputs a low level and the DO pin outputs a high level, the first MOSFET 521 can be turned off. Correspondingly, if both the CO and DO pins of the second detection chip 512 can output a high level, the second MOSFET 522 can remain on; if the CO pin of the second detection chip 512 outputs a low level and the DO pin outputs a high level, the second MOSFET 522 can be turned off.

[0099] It should be noted that the above protection process is for the charging process. In actual implementation, the circuit can also enter the discharging state. When over-discharge occurs in the discharging state, the first detection chip 511 and the second detection chip 512 will change the DO pin from high level to low level and keep the CO pin high level after detecting the cell voltage. This will turn off the first MOSFET 521 and the second MOSFET 522, thereby cutting off the discharge circuit. At this time, the battery cannot discharge to the load, thus playing a protective role.

[0100] It should be noted that in actual implementation, using two MOSFETs can improve the safety of the protection, preventing the circuit from failing to protect itself due to the failure of one of the detection channels, thus improving the overall safety of the circuit.

[0101] In the dual-cell charging circuit provided in this embodiment, the detection unit includes a first detection chip and a second detection chip. The input terminal of the first detection chip is connected to the positive bus and ground, and the output terminal of the first detection chip is connected to a circuit breaker unit. The input terminal of the second detection chip is connected to the positive bus and a sampling resistor, and the output terminal of the second detection chip is connected to the circuit breaker unit. The circuit breaker unit includes a first MOSFET and a second MOSFET. The first MOSFET and the second MOSFET are disposed on the negative bus, wherein the control terminal of the first MOSFET is connected to the output terminal of the first detection chip, and the control terminal of the second MOSFET is connected to the output terminal of the second detection chip. By using two detection units and a circuit breaker unit, the dual-cell charging circuit can be more comprehensively and safely protected, improving the overall circuit safety.

[0102] To provide a more comprehensive explanation of the dual-cell charging circuit provided in this embodiment, the overall structure of the dual-cell charging circuit provided in this embodiment will be explained below.

[0103] Figure 7 For a schematic diagram of the overall structure of the dual-cell charging circuit provided in this application embodiment, please refer to... Figure 7 The circuit includes:

[0104] The components include a first battery cell 100, a second battery cell 200, a first sliding rheostat 310, a second sliding rheostat 410, a first fuel gauge 320, a second fuel gauge 420, a sampling resistor RS1, a first detection chip 511, a second detection chip 512, a first MOSFET 521, and a second MOSFET 522. The connection relationships of these electronic components have been explained above and will not be repeated here.

[0105] Among them, pins 1 and 2 of the first fuel gauge can be connected to both sides of the first sliding rheostat 310, and pins 3 and 4 of the second fuel gauge can be connected to both sides of the second sliding rheostat 410.

[0106] It should be noted that one side of the sampling resistor RS1 can be grounded, the branch containing the first cell 100 can be connected to the load corresponding to the first cell 100, and the branch containing the second cell 200 can be connected to the load corresponding to the second cell 200.

[0107] The following explanation, based on the overall structure described above, details the specific implementation process of current regulation in the dual-cell charging circuit provided in this application embodiment.

[0108] Figure 8 Please refer to the flowchart illustrating the current regulation process of the dual-cell charging circuit provided in this application embodiment. Figure 8 The adjustment process may include:

[0109] First, the battery can be initialized. Then, the battery can be charged using the dual-cell charging circuit described above. The current in each cell's branch can be detected, with the current in the branch containing the first cell being I1 and the current in the branch containing the second cell being I2. If no corresponding data is detected, the detection can end. If data is detected, it can be determined whether the absolute value of I1-I2 is greater than or equal to a preset threshold ε. If not, the detection can be repeated. If yes, impedance balancing can be performed, which involves adjusting the corresponding sliding rheostat using a fuel gauge. After adjustment, it can be determined again whether the absolute value of I1-I2 is greater than or equal to the preset threshold ε. If yes, impedance balancing can continue; if not, impedance balancing can be turned off, and the detection can be repeated.

[0110] In practice, the above steps can be used to adjust the current on the two branches, thereby maintaining the stability of charging.

[0111] Another aspect of this application embodiment provides a power supply device, which includes the above-described dual-cell charging circuit.

[0112] This power supply device can charge other devices by discharging, and it can also charge itself.

[0113] Another aspect of this application embodiment provides an electronic device, the specific structure of which will be explained below.

[0114] This application also provides an electronic device, which includes the above-described dual-cell charging circuit or power supply device.

[0115] It should be noted that the electronic device can be, for example, a mobile phone, tablet, smartwatch, smart bracelet, or other specific electronic device, without any specific restrictions.

[0116] The battery of this electronic device can be a dual-cell battery, and the charging circuit configured can be the aforementioned dual-cell charging circuit.

[0117] During the charging process of electronic devices, the charging and discharging of the battery can be achieved based on the aforementioned dual-cell battery.

[0118] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0119] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-cell charging circuit, characterized in that, include: First battery cell, second battery cell, first adjustment module, and second adjustment module; Wherein, one end of the first battery cell is connected to the positive bus, and the other end of the first battery cell is connected to the negative bus through the first adjustment module. The first adjustment module is used to adjust the current of the branch where the first battery cell is located. One end of the second battery cell is connected to the positive bus via the second adjustment module, and the other end of the second battery cell is connected to the negative bus. The second adjustment module is used to adjust the current in the branch where the second battery cell is located.

2. The dual-cell charging circuit as described in claim 1, characterized in that, The first adjustment module includes: a first sliding rheostat; the second adjustment module includes: a second sliding rheostat; One end of the first sliding rheostat is connected to the negative terminal of the first battery cell, and the other end of the first sliding rheostat is connected to the negative busbar. One end of the second sliding rheostat is connected to the positive busbar, and the other end of the second sliding rheostat is connected to the positive terminal of the second battery cell.

3. The dual-cell charging circuit as described in claim 2, characterized in that, The first adjustment module further includes: a first fuel gauge; The first fuel gauge is connected in parallel with the first sliding rheostat, and the control terminal of the first fuel gauge is connected to the control terminal of the first sliding rheostat.

4. The dual-cell charging circuit as described in claim 2, characterized in that, The second adjustment module further includes: a second fuel gauge; The second fuel gauge is connected in parallel with the second sliding rheostat, and the control terminal of the second fuel gauge is connected to the control terminal of the second sliding rheostat.

5. The dual-cell charging circuit as described in any one of claims 1-4, characterized in that, The dual-cell charging circuit also includes: a sampling resistor and a protection module; The sampling resistor is located on the negative busbar; The input terminals of the protection module are connected to the positive bus and the sampling resistor, respectively, and the output terminal of the protection module is connected to the negative bus.

6. The dual-cell charging circuit as described in claim 5, characterized in that, The protection module includes: a detection unit and a circuit breaking unit; The input terminal of the detection unit is connected to the positive bus and the sampling resistor, and the output terminal of the detection unit is connected to the control terminal of the circuit breaker unit. The detection unit is used to acquire the voltage of the positive bus and the voltage of the sampling resistor and send a circuit breaker signal to the circuit breaker unit. The circuit breaker unit is disposed on the negative busbar, and the circuit breaker unit is used to disconnect the connection when a circuit breaker signal is received from the detection unit.

7. The dual-cell charging circuit as described in claim 6, characterized in that, The detection unit includes: a first detection chip and a second detection chip; The input terminal of the first detection chip is connected to the positive bus and ground, and the output terminal of the first detection chip is connected to the circuit breaker unit. The input unit of the second detection chip is connected to the positive bus and the sampling resistor, and the output terminal of the second detection chip is connected to the circuit breaker unit.

8. The dual-cell charging circuit as described in claim 7, characterized in that, The circuit breaking unit includes: a first MOSFET and a second MOSFET; The first MOS transistor and the second MOS transistor are disposed on the negative bus, wherein the control terminal of the first MOS transistor is connected to the output terminal of the first detection chip, and the control terminal of the second MOS transistor is connected to the output terminal of the second detection chip.

9. A power supply device, characterized in that, The power supply device includes the dual-cell charging circuit as described in any one of claims 1-8.

10. An electronic device, characterized in that, The electronic device includes the power supply device as described in claim 9, or the dual-cell charging circuit as described in any one of claims 1-8.

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