Charging control method, battery pack and power consumption device

Abstract

The present application discloses a charging control method, a battery pack and an electrical device, belonging to the technical field of battery charging control. The charging control method disclosed in the present application is applied in a battery pack, wherein the battery pack comprises a battery and a first charging circuit connected to the battery, and the charging control method comprises: firstly determining the voltage of the battery, and when the voltage of the battery is less than a threshold voltage, controlling the first charging circuit to switch to a semi-conducting state, so that the resistance of the first charging circuit increases, and the current carrying capacity of the first charging circuit is reduced, so that when the battery is connected to the charging device, the battery is charged by the charging device with limited current, so as to reduce the impact of instantaneous large current caused by the voltage difference, and protect electronic components; when the voltage of the battery is greater than or equal to the threshold voltage, the voltage difference is reduced to a safe value, and the current is reduced to a safe value, and the first charging circuit is controlled to switch to a fully-conducting state, so as to release the current limiting control of the battery and perform normal charging.

Description

Technical Field

[0001] The present application belongs to the technical field of battery charging control, and specifically relates to a charging control method, a battery pack and an electrical device. Background Art

[0002] When the battery power is very low, the voltage is also very low, usually less than 3V, while the charging voltage of the charger is usually 5V. The voltage difference between the charging voltage of the charger and the battery voltage is relatively large. At the same time, the impedance of the battery is usually less than 100mΩ. Since current = voltage difference / impedance, if the battery and charger are connected for charging at this time, a momentary high current of about tens of amperes will be generated, which will damage electronic components. Summary of the invention

[0003] Purpose of the invention: The present application develops a charging control method, a battery pack and an electrical device, aiming to solve the technical problem in the prior art that the instantaneous large current output by the charging device causes damage to electronic components.

[0004] Technical solution: In a first aspect, the present application provides a charging control method, which is applied to a battery pack, wherein the battery pack includes a battery and a first charging circuit connected to the battery; the charging control method includes:

[0005] determining a voltage of the battery;

[0006] In response to the voltage of the battery being less than a threshold voltage, controlling the state of the first charging circuit to be a semi-conducting state, so as to perform current-limited charging on the battery through the charging device when connected to the charging device;

[0007] In response to the voltage of the battery being greater than or equal to the threshold voltage, the state of the first charging circuit is controlled to be a fully-on state to release the current limiting control on the battery.

[0008] In some embodiments, the first charging circuit includes a field effect transistor, the field effect transistor is used to control the on and off of the first charging circuit, and the field effect transistor has a gate; controlling the state of the first charging circuit to be a semi-conducting state includes:

[0009] A first gate voltage is applied to the gate to make the state of the field effect tube half-conducting and the state of the first charging circuit half-conducting, and the first gate voltage is less than the conduction voltage of the field effect tube.

[0010] In some embodiments, controlling the state of the first charging circuit to be in a fully-on state includes:

[0011] A second gate voltage is applied to the gate to make the state of the field effect tube fully on and the state of the first charging circuit fully on, and the second gate voltage is greater than or equal to the on-voltage of the field effect tube.

[0012] In a second aspect, an embodiment of the present application further provides a battery pack, comprising:

[0013] Battery;

[0014] A protection board, the protection board comprising a first charging circuit and a protection board chip, the first charging circuit is connected to the battery; the protection board chip is respectively connected to the battery and the first charging circuit, and is used to execute the charging control method as described in any one of the first aspects.

[0015] In some embodiments, the first charging circuit includes a field effect transistor, which is used to control the on and off of the first charging circuit. The field effect transistor has a gate, a first pole and a second pole. The first pole is connected to the battery, and the second pole is used to connect to the charging device. The protection board chip is connected to the gate for loading a gate voltage to the gate.

[0016] In a third aspect, an embodiment of the present application further provides an electrical device, including:

[0017] A battery pack as described in any one of the second aspects;

[0018] A main board is connected to the battery pack.

[0019] In some embodiments, the mainboard includes a current limiting circuit and a second charging circuit, the current limiting circuit is connected in parallel with the second charging circuit, the input end of the current limiting circuit is connected to the input end of the second charging circuit and is used to connect a charging device, and the output end of the current limiting circuit or the output end of the second charging circuit is connected to the first charging circuit.

[0020] In some embodiments, the main board also includes a multi-control switch, which includes a common terminal, a first connection terminal and a second connection terminal. The common terminal is connected in series with the first charging circuit, the first connection terminal is connected in series with the output end of the current limiting circuit, and the second connection terminal is connected in series with the output end of the second charging circuit.

[0021] In some embodiments, the current limiting circuit includes a positive temperature coefficient thermistor for limiting the input current of the first charging circuit based on the temperature of the mainboard.

[0022] In a fourth aspect, an embodiment of the present application further provides a charging control method, which is applied to the power consumption device as described in any one of the third aspects, and the charging control method includes:

[0023] Determine the voltage of the battery;

[0024] In response to the voltage of the battery being less than a threshold voltage, controlling the state of the mainboard to be a current limiting state, so as to limit the input current of the first charging circuit when connected to a charging device;

[0025] In response to the voltage of the battery being greater than or equal to the threshold voltage, the mainboard is controlled to release the current limiting state to release the limitation on the input current.

[0026] Beneficial effect: Compared with the prior art, a charging control method provided in an embodiment of the present application is applied in a battery pack, wherein the battery pack includes a battery and a first charging circuit connected to the battery. The charging control method provided in the present application includes: first determining the voltage of the battery, and when the voltage of the battery is less than a threshold voltage, controlling the first charging circuit to switch to a semi-conducting state, so that the resistance of the first charging circuit increases, and the current-carrying capacity of the first charging circuit is reduced, so that when connected to the charging device, the battery is charged by the charging device with limited current, so as to reduce the impact of instantaneous large current caused by the voltage difference and protect electronic components; when the voltage of the battery is greater than or equal to the threshold voltage, the voltage difference is reduced to a safe value, and the current is reduced to a safe value, and the first charging circuit is controlled to switch to a fully-conducting state to release the current limiting control of the battery for normal charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A flowchart of the charging control method provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the specific structure of the electrical device provided in the embodiment of the present application;

[0031] Figure 4 An exemplary structural diagram of an electrical device provided in an embodiment of the present application;

[0032] Figure 5 A structural diagram of a multi-control switch, a current limiting circuit, and a second charging circuit in an electric device provided in an embodiment of the present application;

[0033] Figure 6A flowchart of the steps of the charging control method of the electric device provided in the embodiment of the present application;

[0034] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0035] Figure numerals: 10, battery pack; 11, battery; 12, protection board; 121, first charging circuit; 122, field effect transistor; 123, protection board chip; 20, main board; 21, current limiting circuit; 211, thermistor; 22, second charging circuit; 23, multi-control switch; 231, common terminal; 232, first connecting terminal; 233, second connecting terminal; 30, data communication circuit; 40, clock communication circuit; 100, memory; 200, processor. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0037] The semi-conduction state of the field effect tube means that during the operation of the field effect tube, the gate voltage is less than the conduction voltage, so that the conduction state of the field effect tube is between fully closed and fully open. In this state, the internal resistance of the field effect tube increases, allowing part of the current to flow through the source and drain, which is a current limiting state.

[0038] When the battery power is very low, its internal voltage is also very low. If a charger is connected at this time, because the voltage difference between the charger voltage and the battery voltage is relatively large (the battery voltage is usually less than 3V, and the charger voltage during charging is usually 5V), a large instantaneous current will be generated, about tens of amperes (the battery impedance is usually 100mΩ, current = voltage difference / impedance). This instantaneous large current will have a high probability of damaging the field effect tube or other components.

[0039] In view of this, an embodiment of the present application provides a charging control method, which is applied in a battery pack 10, and the battery pack 10 includes a battery 11 and a first charging circuit 121 connected to the battery 11. The charging control method provided by the present application includes: first determining the voltage of the battery 11, and when the voltage of the battery 11 is less than a threshold voltage, controlling the first charging circuit 121 to switch to a semi-conducting state, so that the resistance of the first charging circuit 121 increases, and the current capacity of the first charging circuit 121 is reduced, so that when connected to the charging device, the battery 11 is charged by the charging device with limited current, so as to reduce the impact of instantaneous large current caused by the voltage difference and protect electronic components; when the voltage of the battery 11 is greater than or equal to the threshold voltage, the voltage difference is reduced to a safe value, and the current is reduced to a safe value, and the first charging circuit 121 is controlled to switch to a fully conductive state to release the current limiting control of the battery 11 and perform normal charging.

[0040] In some embodiments, see Figure 1 and Figure 2 , Figure 1 A flowchart of the charging control method provided in the embodiment of the present application. Figure 2 Schematic diagram of the structure of the battery pack provided in the embodiment of the present application. The charging control method provided in the embodiment of the present application is applied to the battery pack 10. By way of example, the battery pack 10 is a rechargeable battery in a 3C product. The 3C products include but are not limited to desktop computers, tablet computers, laptop computers, mobile phones, smart bracelets, smart headphones, televisions, digital audio players, video recorders, digital cameras, refrigerators, washing machines, air conditioners, microwave ovens, dishwashers and related industry products.

[0041] Specifically, see Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery pack 10 provided in an embodiment of the present application. The battery pack 10 includes a battery 11 and a protection board 12. The battery 11 may include one or more battery cells. The protection board 12 is electrically connected to the battery 11 and is used to monitor the working data of the battery 11, such as monitoring the voltage data of the battery 11. At the same time, the protection board 12 is used to connect to an external charger. When the battery is out of power, the protection board 12 can be connected to the external charger and charge the battery 11 through the external charger.

[0042] In some embodiments, see Figure 2 , Figure 2The schematic diagram of the structure of the battery pack 10 provided in the embodiment of the present application, wherein a first charging circuit 121 is provided in the protection board 12, and the first charging circuit 121 is connected to the battery 11 for charging the battery 11; specifically, the first charging circuit 121 includes a field effect transistor 122, and the field effect transistor 122 has a gate, a first electrode and a second electrode, the first electrode is connected to the battery 11, and the second electrode is used to connect to the charging device, specifically, the first electrode can be a source electrode or a drain electrode, and the second electrode can be a drain electrode or a source electrode, and when the source electrode of the field effect transistor 122 is connected to the positive electrode of the battery 11, the field effect transistor 122 is connected to the positive electrode of the battery 11. The drain of 122 is used to connect to an external charging device to receive an external charging current through the drain and transmit it to the battery 11 through the source to charge the battery 11; when the drain of the field effect tube 122 is connected to the positive electrode of the battery 11, the source of the field effect tube 122 is used to connect to an external charging device to receive an external charging current through the source and transmit it to the battery 11 through the drain to charge the battery 11; at the same time, the gate of the field effect tube 122 is used to access an external control voltage to control the on and off of the field effect tube 122, thereby achieving the purpose of controlling the on and off of charging of the battery 11.

[0043] In some embodiments, see Figure 2 , Figure 2 The schematic diagram of the structure of the battery pack 10 provided in the embodiment of the present application, the protection board 12 is also provided with a protection board chip 123, the protection board chip 123 is respectively connected to the battery 11 and the first charging circuit 121, and is used to execute the charging control method provided in the embodiment of the present application. Specifically, the protection board chip 123 is connected in parallel with the battery 11 to obtain the voltage of the battery 11; specifically, the protection board chip 123 includes a voltage positive electrode monitoring port Vcel l+ and a voltage negative electrode monitoring port Vcel l-, Vcel l+ is connected to the positive electrode of the battery 11, and Vcel l- is connected to the negative electrode of the battery 11. The protection board chip 123 includes a charging control port CO, and the CO port is connected to the gate of the field effect tube 122, which is used to load the gate voltage to the gate, so as to control the on-off state of the field effect tube 122 by the gate voltage. It can be understood that the charging control method provided in the embodiment of the present application controls the conduction state of the field effect tube 122 by controlling the gate voltage of the field effect tube 122, so as to control the field effect tube 122 to be in a semi-conducting state when the voltage difference between the battery 11 and the external charging voltage is large, so as to increase the resistance of the first charging circuit 121 and achieve the purpose of current limiting charging.

[0044] Specifically, see Figure 1 to Figure 2 , Figure 1 A flowchart of the charging control method provided in the embodiment of the present application. Figure 2 This is a structural schematic diagram of the battery pack 10 provided in an embodiment of the present application. Next, the charging control method of the battery pack 10 provided in an embodiment of the present application is introduced in detail.

[0045] In some embodiments, see Figure 2 , Figure 2 1 is a schematic diagram of the structure of the battery pack 10 provided in the embodiment of the present application. The charging control method of the battery pack 10 provided in the embodiment of the present application is specifically implemented through steps 100 to 300:

[0046] Step 100: Determine the voltage of the battery 11.

[0047] It can be understood that the charging method provided in the embodiment of the present application determines the voltage of the battery 11 by cooperating with the Vcel 1+ port and the Vcel 1- port of the protection board chip 123 to control charging based on the voltage of the battery 11. The charging control method of the present application uses the voltage of the battery 11 in the battery pack 10 as a reference, and controls charging based on the voltage of the battery 11, without considering whether the charging device is connected, whether the charging device has a current limiting function, and whether the charging device is working normally.

[0048] Step 200: In response to the voltage of the battery 11 being less than the threshold voltage, the state of the first charging circuit 121 is controlled to be a semi-conducting state, so as to perform current-limiting charging on the battery 11 through the charging device when connected to the charging device.

[0049] In some embodiments, the first charging circuit 121 includes a field effect tube 122, and the first charging circuit 121 can be controlled to be in a semi-conducting state by controlling the field effect tube 122 to be in a semi-conducting state. Specifically, after the protection board chip 123 determines that the voltage of the battery 11 is less than the threshold voltage, the first gate voltage is applied to the gate of the field effect tube 122 through the CO port, wherein the first gate voltage is less than the conduction voltage of the field effect tube 122, so that the field effect tube 122 is in a semi-conducting state between fully conducting and fully closed, so that the resistance of the field effect tube 122 increases, plays the role of a resistor, and achieves a current limiting effect, so that the battery 11 is charged with a limited current through the charging device when the battery pack 10 is connected to an external charging device.

[0050] For example, the first gate voltage may be set to 50%-60% of the on-voltage, so that the field effect tube 122 can be in a semi-on state, achieving a relatively ideal current limiting effect.

[0051] Step 300 : In response to the voltage of the battery 11 being greater than or equal to the threshold voltage, controlling the state of the first charging circuit 121 to be in a fully-on state to release the current limiting control on the battery 11 .

[0052] In some embodiments, the first charging circuit 121 includes a field effect tube 122, and by controlling the field effect tube 122 to be in a fully on state, the first charging circuit 121 can be controlled to be in a fully on state. Specifically, after the protection board chip 123 determines that the voltage of the battery 11 is greater than or equal to the threshold voltage, the second gate voltage is loaded to the gate of the field effect tube 122 through the CO port, wherein the second gate voltage is greater than or equal to the on voltage of the field effect tube 122. For the sake of service life and safety, the second gate voltage in this application is equal to the on voltage; so that the field effect tube 122 is in a fully on state, so as to reduce the resistance of the field effect tube 122, release the current limiting control of the battery 11, and charge the battery normally. When the battery 11 triggers voltage, current or temperature protection, the protection board chip 123 can load a third gate voltage to the gate of the field effect tube 122 through the CO port to control the field effect tube 122 to be completely disconnected, so that the battery 11 cannot be charged or discharged. Among them, the third gate voltage is equal to the disconnection voltage of the field effect tube 122.

[0053] It can be understood that the threshold voltage mentioned in the embodiments of the present application may be a safe voltage of the battery.

[0054] It can be understood that the charging control method provided in the embodiment of the present application is applied in a battery pack 10, and the battery pack 10 includes a battery 11 and a first charging circuit 121 connected to the battery 11. The charging control method provided in the present application includes: first determining the voltage of the battery 11, and when the voltage of the battery 11 is less than the threshold voltage, controlling the first charging circuit 121 to switch to a semi-conducting state, so that the resistance of the first charging circuit 121 increases, and the current capacity of the first charging circuit 121 is reduced, so that when connected to the charging device, the battery 11 is charged by the charging device with limited current, so as to reduce the impact of instantaneous large current caused by the voltage difference and protect electronic components; when the voltage of the battery 11 is greater than or equal to the threshold voltage, the voltage difference is reduced to a safe value, and the current is reduced to a safe value, and the first charging circuit 121 is controlled to switch to a fully conductive state to release the current limiting control of the battery 11 and perform normal charging.

[0055] Accordingly, the embodiment of the present application also provides an electrical device, please refer to Figure 3 and Figure 4 , Figure 3 A schematic diagram of the specific structure of the electrical device provided in the embodiment of the present application, Figure 4Schematic diagram of the exemplary structure of an electric device provided in an embodiment of the present application. The electric device provided in an embodiment of the present application includes a battery pack 10 and a mainboard 20 provided in an embodiment of the present application. The mainboard 20 is connected to the battery pack 10. When charging the battery pack 10, the mainboard 20 performs current limiting control on the charging current connected to the battery pack 10, so as to limit the charging current entering the battery pack 10 when the internal voltage of the battery 11 is low, so as to further reduce the large current impact caused by the voltage difference between the internal battery 11 and the external charging device, and protect the field effect tube 122 and other electronic components. Specifically, the electric device provided in an embodiment of the present application includes but is not limited to desktop computers, tablet computers, laptop computers, mobile phones, smart bracelets, smart headphones, televisions, digital audio players, video recorders, digital cameras, refrigerators, washing machines, air conditioners, microwave ovens, dishwashers and related industrial products. Exemplarily, when the electric device is a mobile phone, the mainboard 20 can be a mobile phone mainboard, and the external charging device can be a charger.

[0056] In some embodiments, see Figure 3 The main board 20 includes a current limiting circuit 21 and a second charging circuit 22. The current limiting circuit 21 is a circuit that allows only part of the current to pass through to achieve the purpose of current limiting. The second charging circuit 22 does not limit the flow of current, so that the current can pass normally. Specifically, the current limiting circuit 21 is connected in parallel with the second charging circuit 22. The input end of the current limiting circuit 21 is connected to the input end of the second charging circuit 22 and is used to connect the charging device. The output end of the current limiting circuit 21 or the output end of the second charging circuit 22 is connected to the first charging circuit 121. When it is necessary to limit the charging current of the input battery pack 10, the current limiting circuit 21 is connected to the first charging circuit 121 and the second charging circuit 22 is disconnected from the first charging circuit 121 to limit the charging current of the input battery pack 10; when it is necessary to release the current limiting control, the current limiting circuit 21 is disconnected from the first charging circuit 121 and the second charging circuit 22 is connected to the first charging circuit 121 to release the current limiting control of the charging current of the input battery pack 10. At the same time, the input end of the current limiting circuit 21 is connected to the input end of the second charging circuit 22 and connected to the positive electrode of the charging device.

[0057] In some embodiments, see Figure 4, the field effect tube 122 may include a charging MOS tube and a discharging MOS tube, the charging MOS tube and the discharging MOS tube are controlled separately, the charging MOS tube is used for charging control, and the discharging MOS tube is used for discharging control. Specifically, when charging is required, the gate of the charging MOS tube can be loaded with a turn-on voltage (i.e., the second gate voltage), a half-turn-on voltage (i.e., the first gate voltage) or a turn-off voltage (i.e., the third gate voltage) to control the charging condition, and at this time the discharging MOS tube can be in a fully turned-on or turned-off state; when discharging is required, the gate of the discharging MOS tube can be loaded with a turn-on voltage (i.e., the second gate voltage) or a turn-off voltage (i.e., the third gate voltage) to control the discharging state, and at this time the charging MOS tube can be in a fully turned-on, half-turn-on or turned-off state.

[0058] In some embodiments, see Figure 3 and Figure 5 , Figure 5 A structural diagram of a multi-control switch, a current limiting circuit, and a second charging circuit in an electrical device provided in an embodiment of the present application. The current limiting circuit 21 includes a PTC (Positive Temperature Coefficient Thermistor). When the charging current input to the battery pack 10 needs to be limited, the PTC will be connected in series with the first charging circuit 121 to increase the resistance of the charging path and reduce the current in the charging path to achieve the purpose of current limiting. At the same time, the PTC is a thermistor 211 with a positive temperature coefficient. As the temperature increases, the resistance of the thermistor 211 increases, the current limiting effect gradually increases, and the circulating current becomes smaller and smaller. When the battery pack 10 is in a high temperature state, the current can be further limited to reduce the risk of thermal runaway or damage to electronic components caused by high temperature.

[0059] In some embodiments, see Figure 3 and Figure 5 The second charging circuit 22 can be a wire without any electronic components to ensure the normal input of the charging current.

[0060] In some embodiments, see Figure 3 and Figure 5The mainboard 20 may further include a multi-control switch 23 for controlling the connection between the first charging circuit 121 and the current limiting circuit 21 or the second charging circuit 22. In the present application, since the target circuit connected to the first charging circuit 121 is the current limiting circuit 21 or the second charging circuit 22, which is a one-or-the-other connection, the multi-control switch 23 in the present application is a double-control switch. Specifically, the multi-control switch 23 includes a common terminal 231, a first connection terminal 232 and a second connection terminal 233. The common terminal 231 is connected in series with the first charging circuit 121, the first connection terminal 232 is connected in series with the output end of the current limiting circuit 21, and the second connection terminal 233 is connected in series with the output end of the second charging circuit 22. It can be understood that when it is necessary to limit the charging current of the input battery pack 10, the common terminal 231 is connected to the first connection terminal 232 to connect the current limiting circuit 21 with the first charging circuit 121 and disconnect the second charging circuit 22 from the first charging circuit 121, and the battery pack 10 is charged with limited current through the current limiting circuit 21; when it is not necessary to limit the charging current of the input battery pack 10, the common terminal 231 is connected to the second connection terminal 233 to disconnect the current limiting circuit 21 with the first charging circuit 121 and connect the second charging circuit 22 with the first charging circuit 121, and the battery pack 10 is charged normally through the second charging circuit 22.

[0061] In some embodiments, see Figure 3 , Figure 3 This is a structural schematic diagram of an electrical device provided in an embodiment of the present application. The electrical device provided in an embodiment of the present application also includes a data communication circuit 30SDA. The data communication circuit 30 connects the protection board chip 123 and the main board 20, and is used to provide data interaction between the protection board chip 123 and the main board 20.

[0062] In some embodiments, see Figure 3 , Figure 3 This is a structural schematic diagram of an electrical device provided in an embodiment of the present application. The electrical device provided in an embodiment of the present application also includes a clock communication circuit 40SCL. The clock communication circuit 40 connects the protection board chip 123 and the main board 20, and is used to provide clock interaction between the protection board chip 123 and the main board 20.

[0063] Accordingly, see Figure 6 , Figure 6 The present invention is a flowchart of the charging control method of the electric device provided in the embodiment of the present application. The embodiment of the present application also provides a charging control method of the electric device, which is applied to the electric device provided in the embodiment of the present application to limit the charging current input into the battery pack 10 when the voltage of the battery 11 in the electric device is low. Specifically, the charging control method of the electric device provided in the embodiment of the present application is implemented through steps 400 to 600:

[0064] Step 400: Determine the voltage of the battery 11.

[0065] It can be understood that the charging control method of the electrical device provided in the embodiment of the present application determines the voltage of the battery 11 through the cooperation of the Vcel l+ port and the Vcel l- port of the protection board chip 123, and then the protection board chip 123 transmits the voltage data of the battery 11 to the mainboard 20 through the data communication circuit 30, so as to facilitate the mainboard 20 to limit the charging current of the input battery pack 10 based on the voltage of the battery 11.

[0066] Step 500: In response to the voltage of the battery 11 being less than the threshold voltage, the state of the control mainboard 20 is set to a current limiting state, so as to limit the input current of the first charging circuit 121 when connected to a charging device.

[0067] In some embodiments, the main board 20 includes a current limiting circuit 21 and a multi-control switch 23. When the main board 20 detects that the voltage of the battery 11 is less than the threshold voltage, the common terminal 231 in the multi-control switch 23 is controlled to be connected to the first connection terminal 232 to connect the first charging circuit 121 and the current limiting circuit 21, so that the PTC is connected to the charging path, the resistance of the charging path is increased, and the current capacity of the charging circuit is reduced to limit the charging current input to the battery pack 10; at the same time, the PTC is a thermistor 211 with a positive temperature coefficient. As the temperature increases, the resistance of the thermistor 211 increases, the current limiting effect gradually increases, and the circulating current becomes smaller and smaller. When the battery pack 10 is in a high temperature state, the current can be further limited to reduce the risk of thermal runaway or damage to electronic components caused by high temperature.

[0068] Step 600: In response to the voltage of the battery 11 being greater than or equal to the threshold voltage, the main board 20 is controlled to release the current limiting state to release the limitation on the input current.

[0069] In some embodiments, the main board 20 also includes a second charging circuit 22. When the main board 20 detects that the voltage of the battery 11 is greater than or equal to the threshold voltage, the common terminal 231 in the multi-control switch 23 is controlled to be connected to the second connection terminal 233 to connect the first charging circuit 121 and the second charging circuit 22. Since the second charging circuit 22 is a wire and does not include other electronic components, the current limiting control of the charging current input to the battery pack 10 is released for normal charging.

[0070] Accordingly, see Figure 7 , Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. An embodiment of the present application further provides an electronic device, including:

[0071] The memory 100 and the processor 200 are connected to each other in communication, the memory 100 stores computer instructions, and the processor 200 executes the charging control method of the electric device provided in the embodiment of the present application by executing the computer instructions. Specifically, the memory 100 and the processor 200 are connected via a communication bus.

[0072] In some embodiments, the processor 200 may be a central processing unit (CPU). The processor 200 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0073] In some embodiments, the memory 100 is a non-transitory computer-readable storage medium that can be used to store non-transitory software programs, non-transitory computer executable programs and modules, such as program instructions / modules corresponding to the methods in the method embodiments of the present application. The processor 200 executes various functional applications and data processing of the processor 200 by running the non-transitory software programs, instructions and modules stored in the memory 100, that is, implementing the methods in the above method embodiments.

[0074] In some embodiments, the memory 100 may include a program storage area and a data storage area, wherein the program storage area may store an application required for operating the device or at least one function; the data storage area may store data created by the processor 200, etc. In addition, the memory 100 may include a high-speed random access memory 100, and may also include a non-volatile memory 100, such as at least one disk memory 100, a flash memory device, or other non-volatile solid-state memory 100. In some embodiments, the memory 100 may optionally include a memory 100 remotely arranged relative to the processor 200, and these remote memories 100 may be connected to the processor 200 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0075] In some embodiments, one or more modules are stored in the memory 100 and when executed by the processor 200, the methods in the above method embodiments are performed.

[0076] In some embodiments, the specific details of the above-mentioned electronic device can be understood by referring to the corresponding related descriptions and effects in the above-mentioned method embodiments, and will not be repeated here.

[0077] The present application has introduced in detail a charging control method, a battery pack and an electrical device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A charging control method, characterized in that: Applied to a battery pack (10), the battery pack (10) comprising a battery (11) and a first charging circuit (121) connected to the battery (11); the charging control method comprises: determining the voltage of the battery (11); In response to the voltage of the battery (11) being less than a threshold voltage, controlling the state of the first charging circuit (121) to be in a semi-conducting state, so as to perform current-limited charging on the battery (11) through the charging device when connected to the charging device; In response to the voltage of the battery (11) being greater than or equal to the threshold voltage, the state of the first charging circuit (121) is controlled to be a fully-on state, so as to release the current limiting control of the battery (11).

2. The charging control method according to claim 1, characterized in that: The first charging circuit (121) comprises a field effect tube (122), the field effect tube (122) is used to control the on and off of the first charging circuit (121), and the field effect tube (122) has a gate; controlling the state of the first charging circuit (121) to be a semi-conducting state comprises: A first gate voltage is applied to the gate to make the state of the field effect tube (122) a semi-conducting state and the state of the first charging circuit (121) a semi-conducting state, wherein the first gate voltage is less than the conduction voltage of the field effect tube (122).

3. The charging control method according to claim 2, characterized in that: Controlling the state of the first charging circuit (121) to be in a fully-on state comprises: A second gate voltage is applied to the gate, so that the state of the field effect tube (122) is fully turned on, and the state of the first charging circuit (121) is fully turned on, and the second gate voltage is greater than or equal to the turn-on voltage of the field effect tube (122).

4. A battery pack, characterized in that: include: Battery (11); A protection board (12), the protection board (12) comprising a first charging circuit (121) and a protection board chip (123), the first charging circuit (121) being connected to the battery (11); the protection board chip (123) being connected to the battery (11) and the first charging circuit (121), respectively, for executing the charging control method according to any one of claims 1 to 3.

5. The battery pack according to claim 4, characterized in that: The first charging circuit (121) comprises a field effect tube (122), the field effect tube (122) is used to control the on and off of the first charging circuit (121), the field effect tube (122) has a gate, a first electrode and a second electrode, the first electrode is connected to the battery (11), the second electrode is used to be connected to a charging device, and the protection board chip (123) is connected to the gate and is used to load a gate voltage to the gate.

6. An electrical device, characterized in that: include: The battery pack (10) according to any one of claims 4 to 5; A main board (20), the main board (20) being connected to the battery pack (10).

7. The electrical device according to claim 6, characterized in that: The main board (20) comprises a current limiting circuit (21) and a second charging circuit (22); the current limiting circuit (21) and the second charging circuit (22) are connected in parallel; an input end of the current limiting circuit (21) is connected to an input end of the second charging circuit (22) and is used to connect a charging device; an output end of the current limiting circuit (21) or an output end of the second charging circuit (22) is connected to the first charging circuit (121).

8. The electrical device according to claim 7, characterized in that: The main board (20) further comprises a multi-control switch (23), the multi-control switch (23) comprising a common terminal (231), a first connecting terminal (232) and a second connecting terminal (233), the common terminal (231) being connected in series with the first charging circuit (121), the first connecting terminal (232) being connected in series with the output end of the current limiting circuit (21), and the second connecting terminal (233) being connected in series with the output end of the second charging circuit (22).

9. The electrical device according to claim 7, characterized in that: The current limiting circuit (21) comprises a positive temperature coefficient thermistor (211) for limiting the input current of the first charging circuit (121) based on the temperature of the mainboard (20).

10. A charging control method, characterized in that: Applied to the electric device according to any one of claims 6 to 9, the charging control method comprises: determining the voltage of the battery (11); In response to the voltage of the battery (11) being less than a threshold voltage, controlling the state of the mainboard (20) to be a current limiting state, so as to limit the input current of the first charging circuit (121) when connected to a charging device; In response to the voltage of the battery (11) being greater than or equal to the threshold voltage, the main board (20) is controlled to release the current limiting state, so as to release the limitation on the input current.

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