CN114006433A - Battery device - Google Patents
Battery device Download PDFInfo
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- CN114006433A CN114006433A CN202111282873.2A CN202111282873A CN114006433A CN 114006433 A CN114006433 A CN 114006433A CN 202111282873 A CN202111282873 A CN 202111282873A CN 114006433 A CN114006433 A CN 114006433A
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- 238000012544 monitoring process Methods 0.000 claims description 43
- 239000003990 capacitor Substances 0.000 claims description 22
- 230000007547 defect Effects 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 description 10
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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Abstract
The application relates to a battery device, which comprises a battery pack, a power module, a main control chip and a low-power charging circuit, wherein the main control chip is connected with the battery pack through the power module, and the low-power charging circuit is connected with the battery pack, the main control chip and an external terminal; the main control chip is used for sending a turn-off signal to the low-power charging circuit to enable the low-power charging circuit to be in a turn-off state; the power supply module is disconnected when the acquired voltage of the battery pack is lower than a protection threshold value, so that the main control chip loses power, and the main control chip stops sending a turn-off signal to the low-power charging circuit when losing power; the low-power charging circuit is switched to a conducting state when not receiving the turn-off signal, and an external power supply is connected to charge the battery pack through an external terminal. The problem of battery capacity can't directly be resumeed through outside charging after the group battery low-voltage is undervoltage is solved, avoided the group battery after under-voltage, only can take apart the defect that the back is maintained and is charged, improved the convenience and the reliability of battery powered.
Description
Technical Field
The present application relates to the field of battery technology, and more particularly, to a battery device.
Background
With the development of electronic products and the technological level, people have an increasingly large demand for battery energy, and the development of new energy becomes an increasing trend, so that the new energy lithium battery has a large occupation ratio in batteries used in the market. When the voltage and the capacity of a single lithium battery can not meet the use requirement, a plurality of lithium batteries are connected in series and in parallel to form a battery pack, so that the use voltage and the capacity of the battery are improved. In order to be safer and more controllable in the using process, a Battery Management System (BMS) is also added to intelligently manage and maintain each Battery unit.
At present, the battery pack is not charged in time, the electric quantity is exhausted to the undervoltage condition, in order to avoid the irreversible damage caused by the overuse of the battery pack, the power supply connection of the battery management system is disconnected, the battery pack can not be charged through the outside to recover the battery capacity, the battery management system can only be disassembled to maintain and charge, and the use is very inconvenient.
Disclosure of Invention
Therefore, it is necessary to provide a battery device for solving the problem that the battery cannot be recovered by external charging after being under-voltage and is inconvenient to use.
A battery device, comprising: the low-power charging circuit is connected with the battery pack, the main control chip and an external terminal;
the main control chip is used for sending a turn-off signal to the low-power charging circuit to enable the low-power charging circuit to be in a disconnected state;
the power supply module is disconnected when the acquired voltage of the battery pack is lower than a protection threshold value, so that the main control chip loses power, and the main control chip stops sending the turn-off signal to the low-power charging circuit when losing power;
the low-power charging circuit is switched to a conducting state when not receiving the turn-off signal, and an external power supply is connected to charge the battery pack through the external terminal.
In one embodiment, the battery device further includes a front-end monitoring chip, the front-end monitoring chip is connected to the battery pack, the main control chip and the low-power charging circuit, and the front-end monitoring chip is configured to obtain a voltage and a 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 is switched to a turn-on state according to the first turn-on signal when the turn-off signal is not received; the front-end monitoring chip is also used for sending the acquired voltage and current of the battery pack to the main control chip when the main control chip is powered on.
In one embodiment, the low-power charging circuit includes a turn-off unit, a turn-on unit, and a charging unit, the turn-off unit is connected to the main control chip and the turn-on unit, the turn-on 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.
In one embodiment, the turn-off unit includes a first switch tube Q1, a resistor R6, and a resistor R7, the control terminal of the first switch tube Q1 is connected to the main control chip through the resistor R6, the control terminal of the first switch tube Q1 is further grounded through the resistor R7, the first terminal of the first switch tube Q1 is connected to the turn-on unit, and the second terminal of the first switch tube Q1 is grounded.
In one embodiment, the switching-on unit includes a second switch Q4, a conducting tube D4, a resistor R4 and a resistor R5, a control end of the second switch Q4 is grounded, a first end of the second switch Q4 is grounded through the resistor R4, a first end of the second switch Q4 is further connected to the front end monitoring chip through the resistor R5, a first end of the second switch Q4 is further connected to a first end of the first switch Q1, a second end of the second switch Q4 is connected to an anode of the conducting tube D4, and a cathode of the conducting tube D4 is connected to the charging unit.
In one embodiment, the charging unit includes two or more switching tubes, two or more resistors, and two or more resistors, where the number of the resistors is equal to the number of the switching tubes, the charging unit further includes a capacitor C3 and a resistor R1, a control end of each switching tube is connected to a cathode of the conducting tube D4 through one resistor, a first end of each switching tube is connected to the external terminal, a cathode of each conducting tube is connected to a second end of each switching tube, an anode of each conducting tube is connected to a negative electrode of the battery pack, a cathode of each conducting tube is further connected to one end of the capacitor C3, 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 conducting tube D4, and the other end of the resistor R1 is connected to the first end of each switching tube.
In one embodiment, the power module comprises a low-power protection power supply and a low-power consumption power supply, the battery device further comprises a relay and a relay control module, the main control chip is connected with the battery pack through the low-power protection power supply, the low-power consumption power supply is connected with the main control chip, the relay control module is connected with the battery pack through the low-power consumption power supply, the relay control module is further connected with the front-end monitoring chip and the relay, and the relay is connected with the external terminal and the battery pack;
when the voltage of the battery pack acquired by the low-power protection power supply is greater than or equal to the protection threshold value, the low-power protection power supply is conducted to enable the main control chip to be powered on;
when the main control chip is powered on, sending a first control signal to the low-power-consumption power supply according to the received voltage and current of the battery pack, and controlling the on-off state of the low-power-consumption 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 so as to control the opening and closing state of the relay.
In one embodiment, the relay control module includes a first control unit, a second control unit, and a conducting unit, where the first control unit and the second control unit are both connected to the front end monitoring chip, after the first control unit and the second control unit are connected in series, one end of the first control unit is grounded, and the other end of the first control unit is connected to the conducting unit, and the conducting unit connects the low power consumption power supply and the relay.
In one embodiment, the first control unit includes a third switching tube Q13, a resistor R13 and a resistor R16, the second control unit includes a fourth switching tube Q12, a resistor R10, a resistor R14 and a resistor R15, the control end of the third switching tube Q13 is connected to the front end monitoring chip through the resistor R13, the control end of the third switching tube Q13 is further grounded through the resistor R16, the first end of the third switching tube Q13 is grounded, the second end of the third switching tube Q13 is connected to the first end of the fourth switching tube Q12 through the resistor R15, the first end of the fourth switching tube Q12 is connected to the control end of the fourth switching tube Q12 through the resistor R14, the control end of the fourth switching tube Q12 is connected to the front end monitoring chip through the resistor R10, and the second end of the fourth switching tube Q12 is connected to the switch unit.
In one embodiment, the conducting unit includes a fifth switching tube Q11, a resistor R11, a resistor R12, a second conducting tube D10, a capacitor C1 and a capacitor C2, a control end of the fifth switching tube Q11 is connected to the second end of the fourth switching tube Q12 through the resistor R12, the control end of the fifth switching tube is connected to the low power consumption power supply through the resistor R11, a first end of the fifth switching tube Q11 is connected to the low power consumption power supply, a first end of the fifth switching tube Q11 is grounded through the capacitor C1 and the capacitor C2, a second end of the fifth switching tube Q11 is connected to an anode of the second conducting tube D10, and a cathode of the second conducting tube D10 is connected to the relay.
Above-mentioned battery device, when the group battery is under-voltage to the main control chip loses the electricity, switches on through connecting the low-power charging circuit between external terminal and group battery, inserts external power supply and charges to the group battery, has solved the unable direct problem of recovering battery capacity through outside charging behind the group battery low-power under-voltage, has avoided the group battery under-voltage back, can only take apart the back and maintain the defect of charging, has improved the convenience and the reliability of battery powered.
Drawings
FIG. 1 is a system block diagram of a battery device in one embodiment;
FIG. 2 is a system block diagram of a power module in one embodiment;
FIG. 3 is a circuit diagram of an embodiment of a low-voltage protection circuit;
fig. 4 is a circuit diagram of a relay control module according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In one embodiment, as shown in fig. 1, a battery device capable of recovering battery capacity through external charging even under undervoltage is provided, which includes a battery pack 110, a power module 120, a main control chip 130 and a low-power charging circuit 140, wherein 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 an external terminal; the main control chip 130 is configured 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 acquired voltage of the battery pack 110 is lower than the protection threshold value, so that the main control chip 130 loses power, and the main control chip 130 stops sending a turn-off signal to the low-power charging circuit 140 when losing power; the low-power charging circuit 140 is switched to an on state when it does not receive the off signal, and is connected to an external power source through an external terminal to charge the battery pack 110.
Specifically, the battery pack 110 is formed by connecting a plurality of single batteries in series and parallel, and after being connected in series, the battery pack includes a total positive terminal B + and a total negative terminal B-, and the total positive terminal B + and the total negative terminal B-of the battery pack 110 are respectively connected with an external positive terminal P + and an external negative terminal P-. The external device connected with the two external terminals is not unique, and can be connected with a load to form a discharge loop, and the battery pack 110 is adopted to supply power to the load; an external power source may also be connected to form a charging loop, and the battery pack 110 may be charged by the external power source.
Further, the main control chip 130 can monitor and control the operation state of the entire battery pack 110, that is, the main control chip 130 can control and monitor the operation state of the discharging circuit and the charging circuit of the battery pack 110. Meanwhile, the main control chip 130 is also connected to the battery pack 110 through the power module 120 to obtain voltage, and the main control chip 130 is powered by the energy of the battery pack 110. However, when the voltage of the battery pack 110 acquired by the power module 120 is lower than the protection threshold, the power module 120 is automatically turned off, and the power is no longer supplied to the main control chip 130, so that the battery pack 110 is protected from being damaged due to overuse. It can be understood that the protection threshold is a voltage value when the battery pack 110 is in an undervoltage state and the battery capacity is about to be exhausted, and may be set according to the capacity of the battery pack 110 actually used.
When the battery pack 110 is under-voltage and loses power to the main control chip 130, the original charging circuit is disconnected and cannot be normally charged, but the charging circuit is formed by the low-power charging circuit 140 connected between the external terminal and the battery pack 110, and after the low-power charging circuit 140 is switched on, an external power supply is switched on through the external terminal and the low-power charging circuit 140 to charge the battery pack 110.
Specifically, the control terminal 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 enables the low-power charging circuit 140 to maintain a shutdown state. It can be understood that the shutdown signal can only be sent out when the main control chip 130 is powered, that is, when the main control chip 130 works, the main control chip 130 is continuously used to control the charging loop and the discharging loop of the battery pack 110, and the low-power charging circuit 140 does not work. When the main control chip 130 loses power, the low-power charging circuit 140 stops sending the off signal, and the low-power charging circuit 140 is switched to the on state, and an external power supply is connected to the battery pack 110 through the external terminal to charge the battery pack.
It is understood that the low-power charging circuit 140 is switched to the on state when it does not receive the turn-off signal, and may be automatically switched to the on state by being connected to an external power source to obtain a level, or may be directly connected to the battery pack 110 to obtain a level switched to the on state, which is not limited thereto. In addition, the low-power charging circuit 140 may be connected between the overall positive terminal B + and the external positive terminal P +, or may be connected between the overall negative terminal B-and the external negative terminal P-, respectively, without being limited thereto.
Above-mentioned battery device, when the group battery is under-voltage to the main control chip loses the electricity, switches on through connecting the low-power charging circuit between external terminal and group battery, inserts external power supply and charges to the group battery, has solved the unable direct problem of recovering battery capacity through outside charging behind the group battery low-power under-voltage, has avoided the group battery under-voltage back, can only take apart the back and maintain the defect of charging, has improved the convenience and the reliability of battery powered.
In an embodiment, as shown in fig. 1, the battery device further includes a front-end monitoring chip 150, the front-end monitoring chip 150 is connected to the battery pack 110, the main control chip 130 and the low-power charging circuit 140, and the front-end monitoring chip 150 is configured to obtain a voltage and a current of the battery pack 110 and send a first on signal to the low-power charging circuit 140, so that the low-power charging circuit 140 is switched to an on state according to the first on signal when not receiving the turn-off signal; the front-end monitoring chip 150 is further configured to send the acquired voltage and current of the battery pack to the main control chip 130 when the main control chip 130 is powered on.
Specifically, the front-end monitoring chip 150 is configured to collect the voltage and the current of the battery pack 110 in real time, where the voltage is collected by directly connecting the battery pack 110, and the current can be collected by a shunt connected to a loop between the battery pack and an external terminal.
The front-end monitoring chip 150 acquires the voltage and the current of the battery pack 110, and on one hand, is configured to send a first turn-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 is switched to a turn-on state according to the first turn-on signal when not receiving a turn-off signal, and is connected to an external power supply through an external terminal to charge the battery pack 110. On the other hand, the controller is further configured to perform bidirectional data communication with the main control chip 130 when the main control chip 130 is powered on, and send the voltage and the current acquired in real time to the main control chip 130, so as to provide a data basis for monitoring and controlling the working state of the battery pack 110 for the main control chip 130, and better realize control of the battery pack 110.
In one embodiment, as shown in fig. 1 and fig. 2, the power module 120 includes a low-power protection power source 121 and a low-power consumption power source 122, the battery device further 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 source 121, the low-power consumption power source 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 consumption power source 122, the relay control module 170 is further 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 voltage of the battery pack 110 acquired by the low-power protection power supply 121 is greater than or equal to the protection threshold, the low-power protection power supply 121 is turned on, so that the main control chip 130 is powered; when the main control chip 130 is powered on, sending a first control signal to the low power consumption power supply 122 according to the received voltage and current of the battery pack 110, and controlling the on-off state of the low power consumption power supply 122; the main control chip 130 further sends a second control signal to the front end monitoring chip 150, and controls the front end monitoring chip 150 to send a second opening signal to the relay control module 170, so as to control the opening and closing state of the relay 160.
Specifically, as shown in fig. 2, the power module 120 includes a low-power protection power supply 121 and a low-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 supply 122 includes a low-power circuit and a power supply 2. The power supply 1 is connected to the total positive terminal B + of the battery pack 110 through the low-voltage protection circuit to obtain voltage, and the voltage is reduced and then output to the main control chip 130 for power supply. The power supply 2 is connected with the total positive terminal B + of the battery pack 110 through a low-power consumption circuit to obtain voltage, and the voltage is reduced and then output to the relay 160 to be triggered and conducted. The voltage reduction amplitude of the power supply 1 is different from that of the power supply 2, and the voltage reduction amplitude can be set according to an actual power supply scene. The main control chip 130 and the relay 160 are powered by the two different power supplies, so that the safe and normal operation of the battery device can be ensured.
Further, the relay 160 is connected in series to the external terminal and the charging circuit and the discharging circuit of the battery pack 110, and is used for assisting the main control chip 130 to control and monitor the working states of the discharging circuit and the charging circuit of the battery pack 110 when the main control chip 130 is powered on. Specifically, the controlled part of the relay 160 connects the battery pack 110 and the external terminal, the control part thereof is connected to the low power consumption power supply 122 through the controlled part of the relay control module 170, 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. The front-end monitoring chip 150 collects the voltage and current of the battery pack 110 and then performs bidirectional data communication with the main control chip 130. The main control chip 130 sends a first control signal to the low power consumption circuit in the low power consumption power supply 122 according to the voltage and the current to control the on/off state thereof. The main control chip 130 further sends a second control signal to the front end monitoring chip 150 according to the voltage and the current, and controls the front end monitoring chip 150 to send a second open signal to the relay control module 170, so as to control the open/close state of the relay 160, and further control the open/close state of the relay 160.
It is understood that the above-mentioned on-off state may include an on state and an off state; the function of the first control signal is not limited to only switching the on/off state of the low power consumption circuit from the on state to the off state, and switching the on/off state of the low power consumption circuit from the off state to the on state. The function of the second control signal is not exclusive, and may be to control sending a second on signal to the relay control module 170, so as to switch the on/off state of the relay 160 from the off state to the on state; the relay control module 170 is also controlled to stop sending the second on signal, so as to switch the on/off 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 on/off state of the low power consumption circuit from the off state to the on state, sends a second control signal to control the front end monitoring chip 150 to send a second on signal to the relay control module 170, switches the on/off state of the relay 160 from the off state to the on state, and switches on the charging loop and the discharging loop of the battery pack 110 and the external terminal. Similarly, the main control chip can disconnect the charging circuit and the discharging circuit of the battery pack 110 and the external terminal when charging or discharging is not required, which is not described herein. The relay 160 controlled by the main control chip 130 is used to enable the battery pack 110 to be turned on when charging and discharging are needed, and turned off when not needed, so that the energy of the battery pack is saved, and personal safety damage caused by accidental touch and misoperation of the battery pack to external discharge can be protected. And the main control chip 130 sends out the first control signal to control the on/off state of the low power consumption circuit, and can also disconnect the battery pack from the low power consumption power supply 122 in time when charging and discharging are not needed, so as to achieve the purpose of reducing the no-load power consumption of the battery pack 110.
In addition, when the low-voltage protection circuit in the low-voltage protection power supply 121 is turned off and the main control chip 130 loses power, the external power supply is connected to the battery pack 110 through the low-voltage charging circuit 140 via the external terminal to form a charging circuit, so as to charge the battery pack 110 in an undervoltage state, 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 is turned back on, so that the main control chip 130 is powered again, the main control chip 130 switches the low-power charging circuit 140 to the off state by the off signal sent again, 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 of battery capacity can't directly be resumeed through outside charging after the group battery low-voltage is undervoltage is solved, avoided the group battery after under-voltage, only can take apart the defect that the back is maintained and is charged, improved the convenience and the reliability of battery powered.
In one embodiment, as shown in fig. 3, the low-power charging circuit 140 includes a turn-off unit 141, a turn-on unit 142, and a charging unit 143, the turn-off unit 141 connects the main control chip 130 and the turn-on unit 142, the turn-on unit 142 connects the front-end monitoring chip 150 and the charging unit 143, and the charging unit 143 connects the external terminal and the battery pack 110.
Specifically, the shutdown unit 141 is connected to the terminal CHG _ MCU of the main control chip 130 to receive a shutdown signal; the turn-on unit 142 is connected to the terminal CHG of the front-end monitor chip 150 to receive the first turn-on signal; the charging unit 143 is connected between the overall negative terminal B-and the external negative terminal P-of the battery pack 110 to form a charging loop.
In one embodiment, as shown in fig. 3, the turn-off unit 141 includes a first switch tube Q1, a resistor R6, and a resistor R7, a control terminal of the first switch tube Q1 is connected to the main control chip 130 through the resistor R6, a control terminal of the first switch tube Q1 is further connected to ground through the resistor R7, a first terminal of the first switch tube Q1 is connected to the turn-on unit 142, and a second terminal of the first switch tube Q1 is connected to ground.
Specifically, the first switch tube Q1 is a triode, a base of the triode is used as a control terminal of the first switch tube Q1, the terminal CHG _ MCU connected to the main control chip 130 receives the turn-off signal, a collector of the triode is used as a first terminal of the first switch tube Q1, and an emitter of the triode is used as a second terminal of the first switch tube Q1.
In one embodiment, as shown in fig. 3, the turn-on unit 142 includes a second switch Q4, a conducting tube D4, a resistor R4 and a resistor R5, a control terminal of the second switch Q4 is grounded, a first terminal of the second switch Q4 is grounded through a resistor R4, a first terminal of the second switch Q4 is further connected to the front-end monitoring chip 150 through a resistor R5, a first terminal of the second switch Q4 is further connected to a first terminal of the first switch Q1, a second terminal of the second switch Q4 is connected to an anode of the conducting tube D4, and a cathode of the conducting tube D4 is connected to the charging unit 143.
Specifically, the second switch Q4 is a P-channel MOS transistor with a gate as a control terminal, a source as a first terminal, and a drain as a second terminal. The source of the second switch Q4 is connected to the collector of the first switch Q1, and the source of the second switch Q4 is further connected to the terminal CHG of the front-end monitor chip 150 for receiving the first on signal. The conductive pipe D4 is a diode.
In one embodiment, as shown in fig. 3, the charging unit 143 includes two or more switching tubes, resistors and conducting tubes, the number of the switching tubes and the conducting tubes is equal to the number of the switching tubes, the charging unit 143 further includes a capacitor C3 and a resistor R1, a control end of each switching tube is connected to a cathode of the conducting tube D4 through one resistor, a first end of each switching tube is connected to an external terminal, a cathode of each conducting tube is connected to a second end of each switching tube, an anode of each switching tube is connected to a negative electrode of the battery pack, a cathode of each conducting tube is further connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to the external terminal, one end of the resistor R1 is connected to a cathode of the conducting tube D4, and the other end of the resistor R1 is connected to the first end of each switching tube.
Specifically, the number of the switching tubes, the resistors, and the conduction tubes is not unique, and may be expanded according to the battery capacity of the battery pack 110 and the amount of current flowing through the charging circuit. For example, in the present embodiment, the charging unit 143 includes a switching tube Q2, a switching tube Q3, a resistor R2, a resistor R3, a conducting tube D1, a conducting tube D2, and a conducting tube D3. The control ends of the switch tube Q2 and the switch tube Q3 are respectively connected with the cathode of a conducting tube D4 through a resistor R2 and a resistor R3, the first ends of the switch tube Q2 and the switch tube Q3 are respectively connected with an external negative electrode end P-, the cathodes of the conducting tube D1, the conducting tube D2 and the conducting tube D3 are respectively connected with the second ends of the switch tube Q2 and the switch tube Q3, the anodes of the switch tube Q2 are respectively connected with a total negative terminal B-, the cathodes of the conducting tube D1, the conducting tube D2 and the conducting tube D3 are also connected with one end of a capacitor C3, and the first ends of the switch tube Q2 and the switch tube Q3 are connected with a resistor R1. The switching tube Q2 and the switching tube Q3 are both N-channel MOS tubes, and have gates as control ends, sources as first ends, and drains as second ends. The conduction tube D1, the conduction tube D2, and the conduction tube D3 are all diodes.
As shown in fig. 3, the gate of the second switch Q4 is continuously connected to a low level to be turned on, when the terminal CHG _ MCU of the main control chip 130 sends an off signal, the first switch Q1 is turned on, the source of the second switch Q4 is at a low level, and further the gates of the switch Q2 and the switch Q3 are at a low level and in an off state, and the low-power charging circuit 140 is also in an off state. When the main control chip 130 loses power, the terminal CHG _ MCU stops sending off a turn-off signal, the first switch tube Q1 is turned off, the first turn-on signal of the terminal CHG of the front-end monitoring chip 150, which is connected to the source of the second switch tube Q4, is switched to a high level, the gates of the switch tube Q2 and the switch tube Q3 are also switched to 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.
In one embodiment, as shown in fig. 1 and 4, the relay control module 170 includes a first control unit 171, a second control unit 172, and a conducting unit 173, the first control unit 171 and the second control unit 172 are connected to the front monitor chip 150, the first control unit 171 and the second control unit 172 are connected in series, and then one end of the first control unit is grounded, the other end of the first control unit is connected to the conducting unit 173, and the conducting unit 173 connects the low power consumption power supply 122 and the relay 160.
Specifically, the first control unit 171 and the second control unit 172 are a relay control module 1 as a control part of the relay control module; the conducting unit 173 is the relay control module 2, which is a controlled part of the relay control module. The first control unit 171 and the second control unit 172 are connected to the terminal CHG and the terminal DSG of the front end monitor chip 150, respectively. The turn-on unit 173 connects the terminal VDDRELY of the low power consumption power supply 122 and the terminal RLY + of the relay 160.
In one embodiment, as shown in fig. 4, the first control unit 171 includes a third switching tube Q13, a resistor R13, and a resistor R16, the second control unit 172 includes a fourth switching tube Q12, a resistor R10, a resistor R14, and a resistor R15, a control terminal of the third switching tube Q13 is connected to the front end monitoring chip 150 through a resistor R13, a control terminal of the third switching tube Q13 is further connected to ground through a resistor R16, a first terminal of the third switching tube Q13 is connected to ground, a second terminal of the third switching tube Q13 is connected to a first terminal of the fourth switching tube Q12 through a resistor R15, a first terminal of the fourth switching tube Q12 is connected to a control terminal of the fourth switching tube Q12 through a resistor R14, a control terminal of the fourth switching tube Q12 is connected to the front end monitoring chip through a resistor R10, and a second terminal of the fourth switching tube Q12 is connected to the conducting unit 173.
Specifically, the third switching transistor Q13 and the fourth switching transistor Q12 are both N-channel MOS transistors, and both 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 Q13 and the fourth switch Q12 are connected to the terminal CHG and the terminal DSG of the front monitor chip 150, respectively, and receive the second control signal.
In one embodiment, as shown in fig. 4, the conducting unit 173 includes a fifth switch tube Q11, a resistor R1, a resistor R12, a second conducting tube D10, a capacitor C1 and a capacitor C2, a control terminal of the fifth switch tube Q11 is connected to a second terminal of the fourth switch tube Q12 through a resistor R12, a control terminal of the fifth switch tube Q11 is connected to the low power consumption power source 122 through a resistor R11, a first terminal of the fifth switch tube Q11 is connected to the low power consumption power source 122, a first terminal of the fifth switch tube Q11 is grounded through a capacitor C1 and a capacitor C2, respectively, a second terminal of the fifth switch tube Q11 is connected to an anode of the second conducting tube D10, and a cathode of the second conducting tube D10 is connected to the relay.
Specifically, the fifth switching transistor Q11 is a P-channel MOS transistor, and has a gate as a control terminal, a source as a first terminal, and a drain as a second terminal. The gate of the fifth switch tube Q11 is connected to the drain of the fourth switch tube Q12 through a resistor R12, the gate of the fifth switch tube Q11 is connected to the terminal VDDRELY of the low power consumption power supply 122 through a resistor R11, and the source of the fifth switch tube Q11 is also connected to the terminal VDDRELY of the low power consumption power supply 122. Second conduction tube D10 is a diode, and the cathode is connected to terminal RLY + of relay 160.
As shown in fig. 4, when the terminal CHG and the terminal DSG are simultaneously connected to the second turn-on signal, and the gates of the third switching tube Q13 and the fourth switching tube Q12 are both at a high level, the third switching tube Q13 and the fourth switching tube Q12 are conducted, and further the gate of the fifth switching tube Q11 is conducted at a low level, and the voltage of the low power consumption power supply 122 is transmitted to the control portion terminal RLY + of the relay 160 through the terminal VDDRELY, at which time the controlled portion of the relay 160 is electrically conducted.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A battery device, comprising: the low-power charging circuit is connected with the battery pack, the main control chip and an external terminal;
the main control chip is used for sending a turn-off signal to the low-power charging circuit to enable the low-power charging circuit to be in a disconnected state;
the power supply module is disconnected when the acquired voltage of the battery pack is lower than a protection threshold value, so that the main control chip loses power, and the main control chip stops sending the turn-off signal to the low-power charging circuit when losing power;
the low-power charging circuit is switched to a conducting state when not receiving the turn-off signal, and an external power supply is connected to charge the battery pack through the external terminal.
2. The battery device according to claim 1, further comprising a front-end monitoring chip, wherein the front-end monitoring chip is connected to the battery pack, the main control chip and the low-power charging circuit, and is configured to obtain a voltage and a current of the battery pack and send a first on signal to the low-power charging circuit, so that the low-power charging circuit is switched to an on state according to the first on signal when the off signal is not received; the front-end monitoring chip is also used for sending the acquired voltage and current of the battery pack to the main control chip when the main control chip is powered on.
3. The battery device according to claim 2, wherein the low-power charging circuit includes a turn-off unit, a turn-on unit, and a charging unit, the turn-off unit being connected to the main control chip and the turn-on unit, the turn-on unit being connected to the front-end monitoring chip and the charging unit, and the charging unit being connected to the external terminal and the battery pack.
4. The battery device according to claim 3, wherein the turn-off unit comprises a first switch tube Q1, a resistor R6 and a resistor R7, the control terminal of the first switch tube Q1 is connected to the main control chip through the resistor R6, the control terminal of the first switch tube Q1 is further connected to the ground through the resistor R7, the first terminal of the first switch tube Q1 is connected to the turn-on unit, and the second terminal of the first switch tube Q1 is connected to the ground.
5. The battery device according to claim 4, wherein the switch-on unit comprises a second switch tube Q4, a conducting tube D4, a resistor R4 and a resistor R5, the control terminal of the second switch tube Q4 is grounded, the first terminal of the second switch tube Q4 is grounded through the resistor R4, the first terminal of the second switch tube Q4 is further connected with the front end monitoring chip through the resistor R5, the first terminal of the second switch tube Q4 is further connected with the first terminal of the first switch tube Q1, the second terminal of the second switch tube Q4 is connected with the anode of the conducting tube D4, and the cathode of the conducting tube D4 is connected with the charging unit.
6. The battery device according to claim 5, wherein the charging unit includes a switching tube, a resistor and a conducting tube, the number of the switch tubes and the conduction tubes is more than two, the number of the resistors is the same as that of the switch tubes, the charging unit further comprises a capacitor C3 and a resistor R1, the control end of each switch tube is connected with the cathode of the conducting tube D4 through one resistor, the first end of each switch tube is connected with the external terminal, the cathode of each conducting tube is connected with the second end of each switch tube, the anode of each conducting tube is connected with the cathode of the battery pack, the cathode of each conducting tube is further connected with one end of the capacitor C3, 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 conductive tube D4, and the other end of the resistor R1 is connected to the first end of each switching tube.
7. The battery device according to claim 2, wherein the power supply module comprises a low-power protection power supply and a low-power consumption power supply, the battery device further comprises a relay and a relay control module, the main control chip is connected with the battery pack through the low-power protection power supply, the low-power consumption power supply is connected with the main control chip, the relay control module is connected with the battery pack through the low-power consumption power supply, the relay control module is further connected with the front-end monitoring chip and the relay, and the relay is connected with the external terminal and the battery pack;
when the voltage of the battery pack acquired by the low-power protection power supply is greater than or equal to the protection threshold value, the low-power protection power supply is conducted to enable the main control chip to be powered on;
when the main control chip is powered on, sending a first control signal to the low-power-consumption power supply according to the received voltage and current of the battery pack, and controlling the on-off state of the low-power-consumption 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 so as to control the opening and closing state of the relay.
8. The battery device according to claim 7, wherein the relay control module comprises a first control unit, a second control unit and a conducting unit, the first control unit and the second control unit are both connected with the front end monitoring chip, after the first control unit and the second control unit are connected in series, one end of the first control unit is grounded, the other end of the first control unit is connected with the conducting unit, and the conducting unit is connected with the low power consumption power supply and the relay.
9. The battery device according to claim 8, wherein the first control unit includes a third switching tube Q13, a resistor R13, and a resistor R16, the second control unit comprises a fourth switching tube Q12, a resistor R10, a resistor R14 and a resistor R15, the control terminal of the third switch tube Q13 is connected with the front monitor 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, a first terminal of the fourth switching transistor Q12 is connected to the control terminal of the fourth switching transistor Q12 through the resistor R14, the control end of the fourth switch tube is connected with the front end monitoring chip through the resistor R10, and the second end of the fourth switch tube Q12 is connected with the conducting unit.
10. The battery device according to claim 9, wherein the conducting unit comprises a fifth switch tube Q11, a resistor R11, a resistor R12, a second conducting tube D10, a capacitor C1 and a capacitor C2, a control end of the fifth switch tube Q11 is connected to the second end of the fourth switch tube Q12 through the resistor R12, a control end of the fifth switch tube Q11 is connected to the low power consumption power source through the resistor R11, a first end of the fifth switch tube Q11 is connected to the low power consumption power source, a first end of the fifth switch tube Q11 is grounded through the capacitor C1 and the capacitor C2, a second end of the fifth switch tube Q11 is connected to the anode of the second conducting tube D1, and a cathode of the second conducting tube D10 is connected to the relay.
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| CN202111282873.2A CN114006433A (en) | 2021-11-01 | 2021-11-01 | Battery device |
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| CN202111282873.2A CN114006433A (en) | 2021-11-01 | 2021-11-01 | Battery device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116666788A (en) * | 2023-07-31 | 2023-08-29 | 苏州融硅新能源科技有限公司 | Battery pack, management method thereof and battery management system |
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