Battery device

Abstract

The present application relates to a battery device, including a battery pack, a power module, a main control chip and a low-power charging circuit, wherein the main control chip is connected to the battery pack through the power module, and the low-power charging circuit is connected to the battery pack, the main control chip and an external terminal; the main control chip is used to send a shutdown signal to the low-power charging circuit, so that the low-power charging circuit is in a disconnected state; the power module is disconnected when the voltage of the acquired battery pack is lower than the protection threshold, so that the main control chip loses power, and when the main control chip loses power, it stops sending the shutdown signal to the low-power charging circuit; the low-power charging circuit switches to a conducting state when the shutdown signal is not received, and charges the battery pack by connecting to an external power supply through an external terminal. The problem that the battery capacity cannot be directly restored by external charging after the battery pack is low-power and under-voltage is solved, and the defect that the battery pack can only be disassembled for maintenance and charging after under-voltage is avoided, is improved. The convenience and reliability of battery power supply are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device. Background Art

[0002] With the development of electronic products and technology, people's demand for battery energy is increasing. At the same time, the development of new energy is becoming more and more a trend, resulting in a large proportion of new energy lithium batteries in the batteries used on the market. When the voltage and capacity of a single lithium battery cannot meet the use requirements, multiple lithium batteries will be connected in series and parallel to form a battery pack to increase the battery's use voltage and capacity. In order to be safer and more controllable during use, a battery management system (BMS) is also added to intelligently manage and maintain each battery unit.

[0003] Currently, when the battery pack is not charged in time and the power is exhausted to the point of undervoltage, in order to prevent the battery pack from causing irreversible damage due to excessive use, the power connection of the battery management system will be disconnected, which will cause the battery pack to be unable to restore the battery capacity through external charging. The battery pack can only be disassembled for maintenance and charging, which is very inconvenient to use. Summary of the invention

[0004] Based on this, it is necessary to provide a battery device to solve the problem that the battery cannot be restored by external charging after undervoltage, which is inconvenient to use.

[0005] A battery device, comprising: a battery pack, a power module, a main control chip and a low-power charging circuit, wherein the main control chip is connected to the battery pack through the power module, and the low-power charging circuit is connected to the battery pack, the main control chip and an external terminal;

[0006] The main control chip is used to send a shutdown signal to the low-battery charging circuit to put the low-battery charging circuit in a disconnected state;

[0007] The power module is disconnected when the voltage of the battery pack obtained is lower than the protection threshold, so that the main control chip loses power. When the main control chip loses power, it stops sending the shutdown signal to the low-power charging circuit;

[0008] The low-battery charging circuit switches to an on state when no shutdown signal is received, and charges the battery pack by connecting to an external power source through the external terminal.

[0009] In one embodiment, the battery device further includes a front-end monitoring chip, which is connected to the battery pack, the main control chip and the low-power charging circuit. The front-end monitoring chip is used to obtain the voltage and current of the battery pack and send a first turn-on signal to the low-power charging circuit, so that the low-power charging circuit switches to an on state according to the first turn-on signal when no turn-off signal is received; the front-end monitoring chip is also used to send the obtained voltage and current of the battery pack to the main control chip when the main control chip is powered on.

[0010] In one embodiment, the low-power charging circuit includes a shutdown unit, an activation unit and a charging unit, the shutdown unit is connected to the main control chip and the activation unit, the activation unit is connected to the front-end monitoring chip and the charging unit, and the charging unit is connected to the external terminal and the battery pack.

[0011] In one embodiment, the shutdown unit includes a first switch tube Q1, a resistor R6 and a resistor R7, the control end of the first switch tube Q1 is connected to the main control chip through the resistor R6, the control end of the first switch tube Q1 is also grounded through the resistor R7, the first end of the first switch tube Q1 is connected to the opening unit, and the second end of the first switch tube Q1 is grounded.

[0012] In one embodiment, the opening unit includes a second switch tube Q4, a conduction tube D4, a resistor R4 and a resistor R5, the control end of the second switch tube Q4 is grounded, the first end of the second switch tube Q4 is grounded through the resistor R4, the first end of the second switch tube Q4 is also connected to the front-end monitoring chip through the resistor R5, the first end of the second switch tube Q4 is also connected to the first end of the first switch tube Q1, the second end of the second switch tube Q4 is connected to the anode of the conduction tube D4, and the cathode of the conduction tube D4 is connected to the charging unit.

[0013] In one embodiment, the charging unit includes a switch tube, a resistor and a conduction tube, the number of the switch tubes and the conduction tubes is more than two, the number of the resistors is consistent with the number of the switch tubes, and the charging unit also includes a capacitor C3 and a resistor R1, the control end of each switch tube is connected to the cathode of the conduction tube D4 through one of the resistors, the first end of each switch tube is connected to the external terminal, the cathode of each conduction tube is connected to the second end of each switch tube, the anode is connected to the negative electrode of the battery pack, the cathode of each conduction tube is also connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the external terminal, one end of the resistor R1 is connected to the cathode of the conduction tube D4, and the other end of the resistor R1 is connected to the first end of each switch tube.

[0014] In one embodiment, the power module includes a low-power protection power supply and a low-power consumption power supply, the battery device also includes a relay and a relay control module, the main control chip is connected to the battery pack through the low-power protection power supply, the low-power consumption power supply is connected to the main control chip, the relay control module is connected to the battery pack through the low-power consumption power supply, the relay control module is also connected to the front-end monitoring chip and the relay, and the relay is connected to the external terminal and the battery pack;

[0015] When the voltage of the battery pack acquired by the low-power protection power supply is greater than or equal to the protection threshold, the low-power protection power supply is turned on to power the main control chip;

[0016] When the main control chip is powered on, a first control signal is sent to the low-power power supply according to the received voltage and current of the battery pack to control the on / off state of the low-power power supply; the main control chip also sends a second control signal to the front-end monitoring chip to control the front-end monitoring chip to send a second opening signal to the relay control module to further control the on / off state of the relay.

[0017] In one embodiment, the relay control module includes a first control unit, a second control unit and a conduction unit, the first control unit and the second control unit are both connected to the front-end monitoring chip, the first control unit and the second control unit are connected in series at one end to the ground and the other end to the conduction unit, and the conduction unit connects the low-power power supply and the relay.

[0018] In one embodiment, the first control unit includes a third switch tube Q13, a resistor R13 and a resistor R16, the second control unit includes a fourth switch tube Q12, a resistor R10, a resistor R14 and a resistor R15, the control end of the third switch tube Q13 is connected to the front-end monitoring chip through the resistor R13, the control end of the third switch tube Q13 is also grounded through the resistor R16, the first end of the third switch tube Q13 is grounded, the second end of the third switch tube Q13 is connected to the first end of the fourth switch tube Q12 through the resistor R15, the first end of the fourth switch tube Q12 is connected to the control end of the fourth switch tube Q12 through the resistor R14, the control end of the fourth switch tube Q12 is connected to the front-end monitoring chip through the resistor R10, and the second end of the fourth switch tube Q12 is connected to the conduction unit.

[0019] In one embodiment, the conduction unit includes a fifth switch tube Q11, a resistor R11, a resistor R12, a second conduction tube D10, a capacitor C1 and a capacitor C2, the control end of the fifth switch tube Q11 is connected to the second end of the fourth switch tube Q12 through the resistor R12, the control end of the fifth switch tube is connected to the low-power power supply through the resistor R11, the first end of the fifth switch tube Q11 is connected to the low-power power supply, the first end of the fifth switch tube Q11 is grounded through the capacitor C1 and the capacitor C2 respectively, the second end of the fifth switch tube Q11 is connected to the anode of the second conduction tube D10, and the cathode of the second conduction tube D10 is connected to the relay.

[0020] The above-mentioned battery device, when the battery pack is under-voltage and the main control chip loses power, connects to an external power source to charge the battery pack by turning on the low-power charging circuit between the external terminal and the battery pack, thereby solving the problem that the battery capacity cannot be directly restored by external charging after the battery pack is under-voltage, and avoids the defect that the battery pack can only be disassembled for maintenance and charging after being under-voltage, thereby improving the convenience and reliability of battery power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a system block diagram of a battery device in one embodiment;

[0022] Figure 2 is a system block diagram of a power module in one embodiment;

[0023] Figure 3 is a circuit diagram of a low-power protection circuit in one embodiment;

[0024] Figure 4 Schematic diagram of a circuit of a relay control module in one embodiment. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0028] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0029] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0030] In one embodiment, Figure 1 As shown, a battery device is provided which can restore the battery capacity through external charging even when the battery is under voltage, and includes a battery pack 110, a power module 120, a main control chip 130 and a low-power charging circuit 140. The main control chip 130 is connected to the battery pack 110 through the power module 120, and the low-power charging circuit 140 is connected to the battery pack 110, the main control chip 130 and the external terminal; the main control chip 130 is used to send a shutdown signal to the low-power charging circuit 140, so that the low-power charging circuit 140 is in a disconnected state; the power module 120 is disconnected when the voltage of the battery pack 110 obtained is lower than the protection threshold, so that the main control chip 130 loses power, and the main control chip 130 stops sending the shutdown signal to the low-power charging circuit 140 when it loses power; the low-power charging circuit 140 switches to a conducting state when the shutdown signal is not received, and charges the battery pack 110 by connecting to an external power source through an external terminal.

[0031] Specifically, the battery pack 110 is composed of a plurality of single cells connected in series and in parallel, and includes a total positive terminal B+ and a total negative terminal B- after the series connection, and the total positive terminal B+ and the total negative terminal B- of the battery pack 110 are respectively connected to the external positive terminal P+ and the external negative terminal P-. The external devices connected to the above two external terminals are not unique, and a load can be connected to form a discharge circuit, and the battery pack 110 is used to power the load; or an external power supply can be connected to form a charging circuit, and the external power supply is used to charge the battery pack 110.

[0032] Furthermore, the main control chip 130 can monitor and control the working state of the entire battery pack 110, that is, the main control chip 130 can control and monitor the working state of the discharge circuit and the charging circuit of the battery pack 110. At the same time, the main control chip 130 also connects to the battery pack 110 through the power module 120 to obtain voltage, and supplies power to the main control chip 130 through the energy of the battery pack 110 itself. However, when the voltage of the battery pack 110 obtained by the power module 120 is lower than the protection threshold, the power module 120 will be automatically disconnected and will no longer continue to supply power to the main control chip 130, so as to protect the battery pack 110 from damage due to excessive use. It can be understood that the protection threshold is the voltage value when the battery pack 110 is in an undervoltage state and the battery capacity is about to be exhausted, which can be set according to the capacity of the battery pack 110 actually used.

[0033] Among them, when the battery pack 110 is undervoltage and the main control chip 130 loses power, the original charging circuit is disconnected and cannot be charged normally. Instead, a charging circuit is formed by connecting the low-power charging circuit 140 between the external terminal and the battery pack 110. After the low-power charging circuit 140 is turned on, the external power supply is connected through the external terminal through the low-power charging circuit 140 to charge the battery pack 110.

[0034] Specifically, the control end of the low-power charging circuit 140 is connected to the main control chip 130, and receives a shutdown signal sent by the main control chip 130, and the shutdown signal keeps the low-power charging circuit 140 in the shutdown state. It can be understood that the shutdown signal can only be sent when the main control chip 130 is powered on, that is, when the main control chip 130 is working, the main control chip 130 is continuously used to control the charging circuit and the discharging circuit of the battery pack 110, and the low-power charging circuit 140 does not work. When the main control chip 130 loses power, it will stop sending the shutdown signal to the low-power charging circuit 140, and the low-power charging circuit 140 will switch to the on state, and the external power supply is connected through the external terminal to charge the battery pack 110.

[0035] It can be understood that when the low-battery charging circuit 140 does not receive the shutdown signal, it switches to the on state, which can be connected to the external power supply to obtain the level and automatically switch to the on state, or it can be directly connected to the battery pack 110 to obtain the level and switch to the on state, without limitation. In addition, the low-battery charging circuit 140 can be connected between the total positive terminal B+ and the external positive terminal P+, or it can be connected between the total negative terminal B- and the external negative terminal P-, without limitation.

[0036] The above-mentioned battery device, when the battery pack is under-voltage and the main control chip loses power, connects to an external power source to charge the battery pack by turning on the low-power charging circuit between the external terminal and the battery pack, thereby solving the problem that the battery capacity cannot be directly restored by external charging after the battery pack is under-voltage, and avoids the defect that the battery pack can only be disassembled for maintenance and charging after being under-voltage, thereby improving the convenience and reliability of battery power supply.

[0037] In one embodiment, Figure 1 As shown, the battery device further includes a front-end monitoring chip 150, which is connected to the battery pack 110, the main control chip 130 and the low-power charging circuit 140. The front-end monitoring chip 150 is used to obtain the voltage and current of the battery pack 110, and send a first turn-on signal to the low-power charging circuit 140, so that the low-power charging circuit 140 switches to a conducting state according to the first turn-on signal when no turn-off signal is received; the front-end monitoring chip 150 is also used to send the obtained voltage and current of the battery pack to the main control chip 130 when the main control chip 130 is powered.

[0038] Specifically, the front-end monitoring chip 150 is used to collect the voltage and current of the battery pack 110 in real time. The voltage is collected by directly connecting the battery pack 110, and the current can be collected through a shunt connected to the loop between the battery pack and the external terminal.

[0039] The front-end monitoring chip 150 collects the voltage and current of the battery pack 110. On the one hand, it is used to send a first on-signal to the low-power charging circuit 140 when the main control chip 130 loses power, so that the low-power charging circuit 140 switches to the on state according to the first on-signal when it does not receive the off signal, and charges the battery pack 110 by connecting to an external power source through an external terminal. On the other hand, it is also used to perform two-way data communication with the main control chip 130 when the main control chip 130 is powered, and send the real-time collected voltage and current to the main control chip 130, so as to provide the main control chip 130 with a data basis for monitoring and controlling the working state of the battery pack 110, and better realize the control of the battery pack 110.

[0040] In one embodiment, Figure 1 and Figure 2As shown, the power module 120 includes a low-power protection power supply 121 and a low-power power supply 122, the battery device also includes a relay 160 and a relay control module 170, the main control chip 130 is connected to the battery pack 110 through the low-power protection power supply 121, the low-power power supply 122 is connected to the main control chip 130, the relay control module 170 is connected to the battery pack 110 through the low-power power supply 122, the relay control module 170 is also connected to the front-end monitoring chip 150 and the relay 160, and the relay 160 is connected to the external terminal and the battery pack 110; when the low-power protection When the voltage of the battery pack 110 obtained by the power supply 121 is greater than or equal to the protection threshold, the low-power protection power supply 121 is turned on to power the main control chip 130; when the main control chip 130 is powered, a first control signal is sent to the low-power power supply 122 according to the received voltage and current of the battery pack 110 to control the on and off state of the low-power power supply 122; the main control chip 130 also sends a second control signal to the front-end monitoring chip 150 to control the front-end monitoring chip 150 to send a second opening signal to the relay control module 170, thereby controlling the on and off state of the relay 160.

[0041] Specifically, Figure 2 As shown, the power module 120 includes a low-power protection power supply 121 and a low-power power supply 122. The low-power protection power supply 121 includes a low-power protection circuit and a power supply 1, and the low-power power supply 122 includes a low-power circuit and a power supply 2. Among them, the power supply 1 is connected to the total positive terminal B+ of the battery pack 110 through the low-power protection circuit to obtain the voltage, and outputs it to the main control chip 130 after reducing the voltage for power supply. The power supply 2 is connected to the total positive terminal B+ of the battery pack 110 through the low-power circuit to obtain the voltage, and outputs it to the relay 160 after reducing the voltage for triggering conduction. Among them, the voltage reduction amplitudes of the power supplies 1 and 2 are different, which can be set according to the actual power supply scenario. The main control chip 130 and the relay 160 are respectively powered by the above two different power supplies, which can ensure the safe and normal operation of the battery device.

[0042] Furthermore, the relay 160 is connected in series with the external terminal and the charging circuit and the discharging circuit of the battery pack 110, and is used to assist the main control chip 130 in controlling and monitoring the working state of the discharging circuit and the charging circuit of the battery pack 110 when the main control chip 130 is powered. Specifically, the controlled part of the relay 160 is connected to the battery pack 110 and the external terminal, and its control part is connected to the low-power power supply 122 through the controlled part of the relay control module 170, and the control part of the relay control module 170 is connected to the front-end monitoring chip 150, and the front-end monitoring chip 150 is connected to the main control chip 130. Among them, the front-end monitoring chip 150 collects the voltage and current of the battery pack 110 and then performs two-way data communication with the main control chip 130. The main control chip 130 sends a first control signal to the low-power circuit in the low-power power supply 122 according to the voltage and current to control its open and close state. The main control chip 130 also sends a second control signal to the front-end monitoring chip 150 according to the voltage and current, controls the front-end monitoring chip 150 to send a second opening signal to the relay control module 170, controls the opening and closing state of the relay 160, and further controls the opening and closing state of the relay 160.

[0043] It can be understood that the above-mentioned opening and closing states may include an on state and an off state; the function of the first control signal is not unique, and it may be to switch the opening and closing state of the low-power circuit from the on state to the off state, or it may be to switch the opening and closing state of the low-power circuit from the off state to the on state. The function of the second control signal is also not unique, and it may be to control the sending of a second opening signal to the relay control module 170 to switch the opening and closing state of the relay 160 from the off state to the on state; it may also be to control the stop of sending the second opening signal to the relay control module 170 to switch the opening and closing state of the relay 160 from the on state to the off state. For example, when charging or discharging is required, the main control chip 130 sends a first control signal to switch the opening and closing state of the low-power circuit from the off state to the on state, and sends a second control signal to control the front-end monitoring chip 150 to send a second opening signal to the relay control module 170, switching the opening and closing state of the relay 160 from the off state to the on state, and connecting the charging circuit and the discharging circuit between the battery pack 110 and the external terminal. Similarly, the main control chip can also disconnect the charging circuit and the discharging circuit between the battery pack 110 and the external terminal when charging or discharging is not required, which will not be described in detail here. The use of the relay 160 controlled by the main control chip 130 allows the battery pack 110 to be turned on when charging or discharging is required, and disconnected when not required, which not only saves the energy of the battery pack, but also protects the battery pack from external discharge caused by accidental touch or malfunction. The main control chip 130 sends a first control signal to control the opening and closing state of the low-power circuit, and can also disconnect the battery pack from the low-power power supply 122 in time when charging or discharging is not required, thereby reducing the no-load power consumption of the battery pack 110.

[0044] In addition, when the low-power protection circuit in the low-power protection power supply 121 is disconnected and the main control chip 130 loses power, the external power supply is connected to the battery pack 110 through the external terminal via the low-power charging circuit 140 to form a charging circuit, and the battery pack 110 in the undervoltage state is charged, and the voltage of the battery pack 110 gradually rises. Then, when the voltage of the battery pack 110 obtained by the low-power protection circuit rises to be greater than or equal to the protection threshold, the low-power protection circuit resumes conduction, so that the main control chip 130 is powered again, and the main control chip 130 sends a shutdown signal again to switch the low-power charging circuit 140 to the shutdown state, and the charging circuit of the battery pack 110 is controlled again by the relay 160 controlled by the main control chip 130. The problem that the battery capacity cannot be directly restored by external charging after the battery pack is undervoltage is solved, and the defect that the battery pack can only be disassembled for maintenance and charging after undervoltage is avoided, which improves the convenience and reliability of battery power supply.

[0045] In one embodiment, Figure 3 As shown, the low-power charging circuit 140 includes a shutdown unit 141, an opening unit 142 and a charging unit 143. The shutdown unit 141 is connected to the main control chip 130 and the opening unit 142. The opening unit 142 is connected to the front-end monitoring chip 150 and the charging unit 143. The charging unit 143 is connected to the external terminal and the battery pack 110.

[0046] Specifically, the shutdown unit 141 is connected to the terminal CHG_MCU of the main control chip 130 to receive a shutdown signal; the activation unit 142 is connected to the terminal CHG of the front-end monitoring chip 150 to receive a first activation signal; the charging unit 143 is connected between the total negative terminal B- of the battery pack 110 and the external negative terminal P- to form a charging circuit.

[0047] In one embodiment, Figure 3 As shown, the shutdown unit 141 includes a first switch tube Q1, a resistor R6 and a resistor R7. The control end of the first switch tube Q1 is connected to the main control chip 130 through the resistor R6, and the control end of the first switch tube Q1 is also grounded through the resistor R7. The first end of the first switch tube Q1 is connected to the opening unit 142, and the second end of the first switch tube Q1 is grounded.

[0048] Specifically, the first switch tube Q1 is a transistor, the base of the transistor serves as the control end of the first switch tube Q1, connected to the terminal CHG_MCU of the main control chip 130 to receive a shutdown signal, the collector of the transistor serves as the first end of the first switch tube Q1, and the emitter of the transistor serves as the second end of the first switch tube Q1.

[0049] In one embodiment, Figure 3As shown, the opening unit 142 includes a second switch tube Q4, a conduction tube D4, a resistor R4 and a resistor R5. The control end of the second switch tube Q4 is grounded, the first end of the second switch tube Q4 is grounded through the resistor R4, the first end of the second switch tube Q4 is also connected to the front-end monitoring chip 150 through the resistor R5, the first end of the second switch tube Q4 is also connected to the first end of the first switch tube Q1, the second end of the second switch tube Q4 is connected to the anode of the conduction tube D4, and the cathode of the conduction tube D4 is connected to the charging unit 143.

[0050] Specifically, the second switch tube Q4 is a P-channel MOS tube, with the gate as the control terminal, the source as the first terminal, and the drain as the second terminal. The source of the second switch tube Q4 is connected to the collector of the first switch tube Q1, and the source of the second switch tube Q4 is also connected to the terminal CHG of the front-end monitoring chip 150 to receive the first turn-on signal. In addition, the conduction tube D4 is a diode.

[0051] In one embodiment, Figure 3 As shown, the charging unit 143 includes a switch tube, a resistor and a conduction tube. The number of the switch tubes and the conduction tubes is more than two, and the number of the resistors is consistent with the number of the switch tubes. The charging unit 143 also includes a capacitor C3 and a resistor R1. The control end of each switch tube is connected to the cathode of the conduction tube D4 through a resistor, the first end of each switch tube is connected to the external terminal, the cathode of each conduction tube is connected to the second end of each switch tube, and the anode is connected to the negative electrode of the battery pack. The cathode of each conduction tube is also connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the external terminal. One end of the resistor R1 is connected to the cathode of the conduction tube D4, and the other end of the resistor R1 is connected to the first end of each switch tube.

[0052] Specifically, the number of switches, resistors and conduction tubes is not unique, and can be expanded according to the battery capacity of the battery pack 110 and the current flowing through the charging circuit. For example, in this embodiment, the charging unit 143 includes a switch tube Q2, a switch tube Q3, a resistor R2, a resistor R3, a conduction tube D1, a conduction tube D2 and a conduction tube D3. The control ends of the switch tubes Q2 and Q3 are connected to the cathode of the conduction tube D4 through the resistors R2 and R3 respectively, the first ends of the switch tubes Q2 and Q3 are connected to the external negative terminal P-, the cathodes of the conduction tubes D1, D2 and D3 are connected to the second ends of the switch tubes Q2 and Q3 respectively, and the anodes are connected to the total negative terminal B- of the battery pack 110, the cathodes of the conduction tubes D1, D2 and D3 are also connected to one end of the capacitor C3, and the first ends of the switch tubes Q2 and Q3 are connected to the resistor R1. The switch tube Q2 and the switch tube Q3 are both N-channel MOS tubes, with the gate as the control terminal, the source as the first terminal, and the drain as the second terminal. The conduction tubes D1, D2, and D3 are all diodes.

[0053] like Figure 3 As shown, the gate of the second switch tube Q4 is continuously connected to a low level and turned on. When the terminal CHG_MCU of the main control chip 130 sends a shutdown signal, the first switch tube Q1 is turned on, the source of the second switch tube Q4 is at a low level, and then the gates of the switch tubes Q2 and Q3 are at a low level and are in a disconnected state, and the low-power charging circuit 140 is also in a disconnected state. When the main control chip 130 loses power, the terminal CHG_MCU stops sending a shutdown signal, the first switch tube Q1 is turned off, and the source of the second switch tube Q4 is connected to the first turn-on signal of the terminal CHG of the front-end monitoring chip 150, which is switched to a high level, and then the gates of the switch tubes Q2 and Q3 are also turned on at a high level, and the external negative terminal P- and the total negative terminal B- of the battery pack 110 form a charging loop through the low-power charging circuit 140 for charging.

[0054] In one embodiment, Figure 1 and Figure 4 As shown, the relay control module 170 includes a first control unit 171, a second control unit 172 and a conduction unit 173. The first control unit 171 and the second control unit 172 are both connected to the front-end monitoring chip 150. The first control unit 171 and the second control unit 172 are connected in series, and one end is grounded and the other end is connected to the conduction unit 173. The conduction unit 173 is connected to the low-power power supply 122 and the relay 160.

[0055] Specifically, the first control unit 171 and the second control unit 172 are the relay control module 1, which is the control part of the relay control module; the conduction unit 173 is the relay control module 2, which is the controlled part of the relay control module. The first control unit 171 and the second control unit 172 are respectively connected to the terminal CHG and the terminal DSG of the front-end monitoring chip 150. The conduction unit 173 is connected to the terminal VDDRELY of the low-power power supply 122 and the terminal RLY+ of the relay 160.

[0056] In one embodiment, Figure 4 As shown, the first control unit 171 includes a third switch tube Q13, a resistor R13 and a resistor R16, and the second control unit 172 includes a fourth switch tube Q12, a resistor R10, a resistor R14 and a resistor R15. The control end of the third switch tube Q13 is connected to the front-end monitoring chip 150 through the resistor R13, and the control end of the third switch tube Q13 is also grounded through the resistor R16. The first end of the third switch tube Q13 is grounded, and the second end of the third switch tube Q13 is connected to the first end of the fourth switch tube Q12 through the resistor R15. The first end of the fourth switch tube Q12 is connected to the control end of the fourth switch tube Q12 through the resistor R14, and the control end of the fourth switch tube Q12 is connected to the front-end monitoring chip through the resistor R10. The second end of the fourth switch tube Q12 is connected to the conduction unit 173.

[0057] Specifically, the third switch tube Q13 and the fourth switch tube Q12 are both N-channel MOS tubes, both of which have a gate as a control terminal, a source as a first terminal, and a drain as a second terminal. The gates of the third switch tube Q13 and the fourth switch tube Q12 are respectively connected to the terminal CHG and the terminal DSG of the front-end monitoring chip 150 to receive the second control signal.

[0058] In one embodiment, Figure 4 As shown, the conduction unit 173 includes a fifth switch tube Q11, a resistor R1 and a resistor R12, a second conduction tube D10, a capacitor C1 and a capacitor C2. The control end of the fifth switch tube Q11 is connected to the second end of the fourth switch tube Q12 through the resistor R12, the control end of the fifth switch tube Q11 is connected to the low power supply 122 through the resistor R11, the first end of the fifth switch tube Q11 is connected to the low power supply 122, the first end of the fifth switch tube Q11 is grounded through the capacitor C1 and the capacitor C2 respectively, the second end of the fifth switch tube Q11 is connected to the anode of the second conduction tube D10, and the cathode of the second conduction tube D10 is connected to the relay.

[0059] Specifically, the fifth switch tube Q11 is a P-channel MOS tube, with the gate as the control terminal, the source as the first terminal, and the drain as the second terminal. The gate of the fifth switch tube Q11 is connected to the drain of the fourth switch tube Q12 through the resistor R12, the gate of the fifth switch tube Q11 is connected to the terminal VDDRELY of the low power supply 122 through the resistor R11, and the source of the fifth switch tube Q11 is also connected to the terminal VDDRELY of the low power supply 122. The second conduction tube D10 is a diode, and the cathode is connected to the terminal RLY+ of the relay 160.

[0060] like Figure 4 As shown, when the terminal CHG and the terminal DSG are simultaneously connected to the second turn-on signal, when the gates of the third switch tube Q13 and the fourth switch tube Q12 are both at a high level, the third switch tube Q13 and the fourth switch tube Q12 are turned on, and then the gate of the fifth switch tube Q11 is turned on at a low level, and the voltage of the low-power power supply 122 is transmitted to the control part terminal RLY+ of the relay 160 through the terminal VDDRELY, and at this time, the controlled part of the relay 160 is electrically turned on.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery device, characterized in that: include: A battery pack, a low-power protection power supply, a low-power power supply, a main control chip, a front-end monitoring chip, a relay, a relay control module and a low-power charging circuit, wherein the low-power charging circuit includes a shut-down unit, an opening unit and a charging unit, the main control chip is connected to the battery pack through the low-power protection power supply, the low-power power supply is connected to the main control chip, the front-end monitoring chip is connected to the battery pack and the main control chip, the shut-down unit is connected to the main control chip and the opening unit, the opening unit is connected to the front-end monitoring chip and the charging unit, the charging unit is connected to an external terminal and the battery pack, the relay control module is connected to the battery pack through the low-power power supply, the relay control module is also connected to the front-end monitoring chip and the relay, and the relay is connected to the external terminal and the battery pack; The main control chip is used to send a shutdown signal to the low-battery charging circuit to put the low-battery charging circuit in a disconnected state; When the voltage of the battery pack obtained by the low-power protection power supply is lower than the protection threshold, the power supply is disconnected to make the main control chip lose power. When the main control chip loses power, the main control chip stops sending the shutdown signal to the shutdown unit of the low-power charging circuit; The front-end monitoring chip is used to obtain the voltage and current of the battery pack, and send a first start signal to the start unit of the low-power charging circuit, so that when the shutdown unit does not receive the shutdown signal, the start unit is controlled to switch to the on state according to the first start signal, and the battery pack is charged by connecting to an external power source through the external terminal via the charging unit; When the voltage of the battery pack acquired by the low-power protection power supply is greater than or equal to the protection threshold, the low-power protection power supply is turned on to power the main control chip; When the main control chip is powered, a first control signal is sent to the low-power power supply according to the received voltage and current of the battery pack to control the on / off state of the low-power power supply; the main control chip also sends a second control signal to the front-end monitoring chip to control the front-end monitoring chip to send a second on / off signal to the relay control module to control the on / off state of the relay; The front-end monitoring chip is also used to send the acquired voltage and current of the battery pack to the main control chip when the main control chip is powered.

2. The battery device according to claim 1, characterized in that: The shutdown unit includes a first switch tube Q1, a resistor R6 and a resistor R7. The control end of the first switch tube Q1 is connected to the main control chip through the resistor R6. The control end of the first switch tube Q1 is also grounded through the resistor R7. The first end of the first switch tube Q1 is connected to the opening unit, and the second end of the first switch tube Q1 is grounded.

3. The battery device according to claim 2, characterized in that: The opening unit includes a second switch tube Q4, a conduction tube D4, a resistor R4 and a resistor R5. The control end of the second switch tube Q4 is grounded, the first end of the second switch tube Q4 is grounded through the resistor R4, the first end of the second switch tube Q4 is also connected to the front-end monitoring chip through the resistor R5, the first end of the second switch tube Q4 is also connected to the first end of the first switch tube Q1, the second end of the second switch tube Q4 is connected to the anode of the conduction tube D4, and the cathode of the conduction tube D4 is connected to the charging unit.

4. The battery device according to claim 3, characterized in that: The charging unit includes a switch tube, a resistor and a conduction tube. The number of the switch tubes and the conduction tubes is more than two, and the number of the resistors is consistent with the number of the switch tubes. The charging unit also includes a capacitor C3 and a resistor R1. The control end of each switch tube is connected to the cathode of the conduction tube D4 through one of the resistors. The first end of each switch tube is connected to the external terminal, the cathode of each conduction tube is connected to the second end of each switch tube, and the anode is connected to the cathode of the battery pack. The cathode of each conduction tube is also connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the external terminal. One end of the resistor R1 is connected to the cathode of the conduction tube D4, and the other end of the resistor R1 is connected to the first end of each switch tube.

5. The battery device according to claim 1, characterized in that: The low-power protection power supply includes a low-power protection circuit and a power supply 1. The power supply 1 is connected to the battery pack through the low-power protection circuit, and the power supply 1 is also connected to the main control chip.

6. The battery device according to claim 5, characterized in that: The low-power power supply includes a low-power circuit and a power supply 2. The power supply 2 is connected to the battery pack via the low-power circuit. The power supply 2 is also connected to the relay. The low-power circuit is also connected to the main control chip.

7. The battery device according to claim 6, characterized in that: The voltage reduction amplitudes of the power source 1 and the power source 2 are different.

8. The battery device according to claim 1, characterized in that: The relay control module includes a first control unit, a second control unit and a conduction unit. The first control unit and the second control unit are both connected to the front-end monitoring chip. The first control unit and the second control unit are connected in series at one end to the ground and the other end to the conduction unit. The conduction unit connects the low-power power supply and the relay.

9. The battery device according to claim 8, characterized in that: The first control unit includes a third switch tube Q13, a resistor R13 and a resistor R16, and the second control unit includes a fourth switch tube Q12, a resistor R10, a resistor R14 and a resistor R15. The control end of the third switch tube Q13 is connected to the front-end monitoring chip through the resistor R13, and the control end of the third switch tube Q13 is also grounded through the resistor R16. The first end of the third switch tube Q13 is grounded, and the second end of the third switch tube Q13 is connected to the first end of the fourth switch tube Q12 through the resistor R15. The first end of the fourth switch tube Q12 is connected to the control end of the fourth switch tube Q12 through the resistor R14, and the control end of the fourth switch tube is connected to the front-end monitoring chip through the resistor R10. The second end of the fourth switch tube Q12 is connected to the conduction unit.

10. The battery device according to claim 9, characterized in that: The conduction unit includes a fifth switch tube Q11, a resistor R11, a resistor R12, a second conduction tube D10, a capacitor C1 and a capacitor C2. The control end of the fifth switch tube Q11 is connected to the second end of the fourth switch tube Q12 through the resistor R12, the control end of the fifth switch tube Q11 is connected to the low-power power supply through the resistor R11, the first end of the fifth switch tube Q11 is connected to the low-power power supply, the first end of the fifth switch tube Q11 is grounded through the capacitor C1 and the capacitor C2 respectively, the second end of the fifth switch tube Q11 is connected to the anode of the second conduction tube D1, and the cathode of the second conduction tube D10 is connected to the relay.

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