CN114865739A - Battery management system and battery device - Google Patents

Battery management system and battery device Download PDF

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Publication number
CN114865739A
CN114865739A CN202210438819.0A CN202210438819A CN114865739A CN 114865739 A CN114865739 A CN 114865739A CN 202210438819 A CN202210438819 A CN 202210438819A CN 114865739 A CN114865739 A CN 114865739A
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CN
China
Prior art keywords
power supply
voltage
battery pack
battery
module
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Pending
Application number
CN202210438819.0A
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Chinese (zh)
Inventor
陈安平
杨硕
王晓闽
刘伟
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Changsha Une Electric Driving System Co ltd
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Changsha Une Electric Driving System Co ltd
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Priority to CN202210438819.0A priority Critical patent/CN114865739A/en
Publication of CN114865739A publication Critical patent/CN114865739A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068Battery or charger load switching, e.g. concurrent charging and load supply
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007Regulation of charging or discharging current or voltage
    • H02J7/00712Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H02J7/007186Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The application relates to a battery management system and a battery device, comprising: the battery pack charging system comprises a main control chip, a power supply module and a power supply control module, wherein the power supply control module is connected with a battery pack of a battery device, external charging equipment and the power supply module; when the first power supply voltage of the battery pack is lower than a protection threshold value, the power supply control module stops outputting the first power supply voltage to the power supply module, and the main control chip loses power; when the main control chip loses power, stopping outputting a turn-off signal to the external charging equipment so that the external charging equipment outputs a second power supply voltage to the power supply control module; the power supply control module outputs the second power supply voltage to the power supply module, so that the main control chip is powered on, the relay is switched to a conducting state, the battery pack is charged through external charging equipment, and the problems that the battery cannot be recovered through external charging and is inconvenient to use after the battery is under-voltage and especially when the battery voltage reaches 0V are solved.

Description

Battery management system and battery device
Technical Field
The present application relates to the field of lithium battery technology, and in particular, to a battery management system and a battery device.
Background
With the increasing shortage of petroleum resources all over the world, people have an increasing demand for novel energy, and the new energy lithium battery has rapidly permeated all walks of life as the energy of the current most hot substitute petroleum fossil. 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.
However, the battery cell voltage is lower and lower due to the static power consumption of the lithium battery when the lithium battery is used for a long time, and even reaches 0V. When the battery management system is externally connected, the static power consumption of the lithium battery and the power consumption of the battery management system are doubly superposed, so that the shelving time is shortened by times. In case the battery pack is not timely charged to the condition of electric quantity exhaustion, the battery management system avoids irreversible damage caused by excessive use of the battery pack, the battery management system can actively disconnect a power supply of the battery management system, static power consumption is reduced, but the static power consumption of the battery cell can not be eliminated, so that the condition that the voltage of the battery cell is 0V can be generated, the capacity of the battery can not be recovered through external charging after the condition is generated, the battery can only be returned to a factory for maintenance and charging after being disassembled, and the use is very inconvenient.
Disclosure of Invention
Therefore, the battery management system and the battery device are provided for solving the problems that the battery cannot be recovered through external charging and is inconvenient to use after the battery is under-voltage, particularly when the battery voltage reaches 0V.
A battery management system, comprising: the battery charging system comprises a main control chip, a power supply module and a power supply control module, wherein the power supply control module is connected with a battery pack of a battery device, external charging equipment and the power supply module, the power supply module is connected with the main control chip and a relay of the battery device, and the main control chip is also connected with the battery pack and the external charging equipment;
when a first power supply voltage of the battery pack is lower than a protection threshold value, the power supply control module stops outputting the first power supply voltage to the power supply module so as to enable the main control chip to lose power;
when the main control chip loses power, the main control chip stops outputting a turn-off signal to the external charging equipment so that the external charging equipment outputs a second power supply voltage to the power supply control module;
and the power supply control module outputs the second power supply voltage to the power supply module so as to enable the main control chip to be electrified and the relay to be switched to a conducting state, and the battery pack is charged through the external charging equipment.
In one embodiment, when detecting that the first power supply voltage of the battery pack satisfies a switching condition, the main control chip outputs the shutdown signal to the external charging device again, so that the external charging device stops outputting the second power supply voltage to the power supply control module, and the power supply control module switches to output the first power supply voltage to the power supply module.
In one embodiment, the power supply control module includes a voltage output circuit, a low voltage identification circuit, a power supply control circuit and a low voltage charging circuit, the voltage output circuit connects the battery pack, the low voltage identification circuit and the power supply control circuit, the low voltage identification circuit connects the battery pack, the external charging device and the power supply control circuit, the power supply control circuit connects the battery pack and the power supply module, and the low voltage charging circuit connects the low voltage identification circuit, the external charging device and the power supply module.
In one embodiment, the voltage output circuit includes a voltage dividing unit and a voltage stabilizing unit, the voltage dividing unit connects the battery pack and the voltage stabilizing unit, and the voltage stabilizing unit connects the low voltage identification circuit and the power supply control circuit.
In one embodiment, the low voltage identification circuit includes a comparator, a first voltage division unit, and a second voltage division unit, the comparator connects the voltage stabilization unit, the first voltage division unit, the second voltage division unit, and the power supply control circuit, the first voltage division unit connects the battery pack, and the second voltage division unit connects the voltage stabilization unit and the low voltage charging circuit.
In one embodiment, the power supply control circuit includes a first switch unit and a second switch unit, the first switch unit connects the comparator, the voltage regulator unit and the second switch unit, and the second switch unit connects the battery pack and the power module.
In one embodiment, the low-voltage charging circuit comprises a first conduction tube and a second conduction tube, the external charging device is connected with the power module through the first conduction tube, and the external charging device is connected with the second voltage division unit through the second conduction tube.
In one embodiment, the power module includes a first power source, a second power source and a linear regulator, the first power source is connected to the main control chip through the linear regulator, the first power source is further connected to the power supply control module and the second power source, and the second power source is connected to the main control chip and the relay.
In one embodiment, the battery management system further includes a front-end monitoring chip, and the front-end monitoring chip connects the battery pack and the main control chip.
In one embodiment, there is provided a battery device including: the battery management system is connected with the battery pack, the external charging equipment and the control end of the relay, one contact terminal of the relay is connected with the battery pack, and the other contact terminal of the relay is connected with the external charging equipment or a load through the external terminal.
According to the battery management system and the battery device, when the power supply control module judges that the first power supply voltage of the battery pack is lower than the protection threshold value, power supply to the power supply module is cut off, so that the main control chip and the relay lose power. After the main control chip loses power, the output of a turn-off signal to the external charging equipment is stopped, so that the external charging equipment provides second power supply voltage for the power supply control module, the second power supply voltage is output to the power supply module, the relay is recovered and conducted, the charging loop of the battery pack and the external charging equipment is communicated, and the problems that after the battery is under-voltage, particularly when the battery voltage reaches 0V, the external charging cannot be recovered, and the use is inconvenient are effectively solved.
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 supply control module in one embodiment;
FIG. 3 is a circuit diagram of a voltage output circuit according to an embodiment;
FIG. 4 is a circuit diagram of a low voltage identification circuit, a power control circuit, and a low voltage charging circuit according to an embodiment;
fig. 5 is a schematic diagram illustrating connection between a battery device and an external device 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.
As described in the background art, when a lithium battery is used, due to static power consumption of the lithium battery, the cell voltage is lower and lower, even reaches 0V when the lithium battery is placed for a long time. When the Battery Management System (BMS) is externally connected, the static power consumption of the lithium Battery and the power consumption of the Battery Management System are doubly superposed, so that the shelving time is shortened by times. In case the battery pack is not timely charged to the condition of electric quantity exhaustion, the battery management system avoids irreversible damage caused by excessive use of the battery pack, the battery management system can actively disconnect a power supply of the battery management system, static power consumption is reduced, but the static power consumption of the battery cell can not be eliminated, so that the condition that the voltage of the battery cell is 0V can be generated, the capacity of the battery can not be recovered through external charging after the condition is generated, the battery can only be returned to a factory for maintenance and charging after being disassembled, and the use is very inconvenient.
Based on this, the present application provides a battery management system and a battery device, when it is determined that the battery pack voltage for supplying power is lower than the protection threshold, the power supply to the battery management system is cut off, and therefore the main control chip and the relay lose power. After the main control chip loses power, the output of a turn-off signal to the external charging equipment is stopped, so that the external charging equipment provides second power supply voltage for the power supply control module, the second power supply voltage is output to the power supply module, the relay is recovered and conducted, the charging loop of the battery pack and the external charging equipment is communicated, and the problems that after the battery is under-voltage, particularly when the battery voltage reaches 0V, the external charging cannot be recovered, and the use is inconvenient are effectively solved.
In one embodiment, there is provided a battery management system as shown in fig. 1, comprising: the main control chip 110, the power module 120 and the power supply control module 130, the power supply control module 130 is connected to the battery pack 200 of the battery device, the external charging device and the power module 120, the power module 120 is connected to the main control chip 110 and the relay 300 of the battery device, and the main control chip 110 is further connected to the battery pack 200 and the external charging device; when the first power supply voltage of the battery pack 200 is lower than the protection threshold, the power supply control module 130 stops outputting the first power supply voltage to the power supply module 120, so that the main control chip 110 loses power; when the main control chip 110 loses power, it stops outputting the shutdown signal to the external charging device, so that the external charging device outputs the second power supply voltage to the power supply control module 130; the power supply control module 130 outputs the second power supply voltage to the power supply module 120, so that the main control chip 110 is powered on and the relay 300 is switched to a conducting state, and the battery pack 200 is charged through an external charging device.
The battery pack 200 of the battery device may be formed by a single battery cell or by connecting a plurality of battery cells in series, and 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 200 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 200 is adopted to supply power to the load; it is also possible to connect an external charging device to form a charging loop, and charge the battery pack 200 with the external charging device.
A relay 300 is further provided on a connection line between the total positive terminal B + and the external positive terminal P + or between the total negative terminal B-and the external negative terminal P-of the battery pack 200, for controlling whether a discharging circuit or a charging circuit of the battery pack 200 and an external device is turned on or not. When the relay 300 is turned on, the battery pack 200 is communicated with a discharging loop or a charging loop of an external device, and can be used for supplying power to a load or charging by using the external charging device; when the relay 300 is turned off, the battery pack 200 is disconnected from a discharging circuit or a charging circuit of the external device, and power cannot be supplied to the load or the external charging device is used for charging.
The battery management system may be used to monitor and manage the operating state of the battery pack 200, i.e., control and monitor the operating states of the discharging circuit and the charging circuit of the battery pack 200. Specifically, the power module 120 is connected to the total positive terminal B + and the total negative terminal B-of the battery pack 200 through the power supply control module 130, obtains a first power supply voltage, and supplies power to the main control chip 110 according to the obtained first power supply voltage, so as to ensure the normal operation of the battery management system. The power module 120 is further connected to the control terminal of the relay 300, the main control chip 110 can output an enable signal to the power module 120, and the power module 120 is controlled to supply power to the control terminal of the relay 300, so that the relay 300 is turned on, and further the discharging loop or the charging loop of the battery pack 200 is turned on. Correspondingly, when the main control chip 110 stops outputting the enable signal to the power module 120, the power module 120 stops supplying power to the control terminal of the relay 300, so that the relay 300 is turned off, and the discharging loop or the charging loop of the battery pack 200 is turned off.
The main control chip 110 may be connected to the battery pack 200 to obtain working parameters thereof, and determine whether to output an enable signal to the power module 120 according to the working parameters. For example, the operating parameter may be a voltage of the battery pack 200, when the main control chip 110 detects that the voltage of the battery pack 200 is lower than a preset low power threshold, the main control chip 110 stops outputting the enable signal to the power module 120, and controls the power module 120 to stop supplying power to the control terminal of the relay 300, so that the relay 300 is disconnected, and the discharge loop of the battery pack 200 is disconnected. Subsequently, after the battery pack 200 is connected to an external charging device to form a charging loop, the main control chip 110 may correspondingly re-output the enable signal to the power module 120, and control the power module 120 to supply power to the control terminal of the relay 300, so that the relay 300 is turned on. The specific setting value of the preset low power threshold is not unique, and may be set according to the actual power supply parameter of the battery pack 200, which may be understood as a voltage value when the battery pack 200 does not have enough energy to supply power to the load.
The main control chip 110 also sends out a reminding message to remind the user to charge the battery pack 200 in time when detecting that the voltage of the battery pack 200 is lower than the preset low-power threshold and cutting off the discharge loop of the battery pack 200. When the user still does not charge in time, the first power supply voltage of the battery pack 200 will be continuously reduced due to the power consumption of the main control chip and the static self-power consumption of the main control chip. When the voltage value continuously decreases to the protection threshold, the power supply control module 130 stops outputting the first power supply voltage to the power supply module 120, so that the main control chip 110 cannot obtain the energy of the battery device through the power supply module 120 to perform normal power supply, but is connected to an external charging device through the power supply control module 130 to obtain a second power supply voltage to perform power supply. The power supply control module 130 is connected to the positive terminal C + and the negative terminal C-of the external charging device to obtain a second power supply voltage. The protection threshold is smaller than the preset low power threshold, the specific setting value is not unique, and the setting value can be set according to the actual power supply parameter of the battery pack 200, which can be understood as a voltage value when the battery pack 200 does not have enough energy to supply power to the battery management system.
The main control chip 110 is connected to an external charging device through a communication line. When the power module 120 obtains the energy of the battery device to perform normal power supply, the power module will continuously output a shutdown signal to the external charging device, so that the external charging device does not output the second power supply voltage to the power supply control module 130. When the main control chip loses power and stops outputting the shutdown signal to the external charging device, the external charging device outputs a second power supply voltage to the power supply control module 130. The power supply control module 130 outputs the second power supply voltage to the power supply module 120, so that the power supply module 120 recovers power supply to the main control chip 110. Meanwhile, the main control chip 110 outputs an enable signal to the power module 120, and controls the power module 120 to supply power to the control terminal of the relay 300, so that the relay 300 is turned on, and further, a charging loop of the battery pack 200 is turned on, and the battery pack 200 is charged by using an external charging device or other external power sources.
According to the battery management system, when the power supply control module judges that the first power supply voltage is lower than the protection threshold value, power supply for the power supply module is cut off, so that the main control chip and the relay are powered off. After the main control chip loses power, the output of a turn-off signal to the external charging equipment is stopped, so that the external charging equipment provides second power supply voltage for the power supply control module, the second power supply voltage is output to the power supply module, the relay is recovered and conducted, the charging loop of the battery pack and the external charging equipment is communicated, and the problems that after the battery is under-voltage, particularly when the battery voltage reaches 0V, the external charging cannot be recovered, and the use is inconvenient are effectively solved.
In one embodiment, as shown in fig. 1, when detecting that the first power supply voltage of the battery pack 200 satisfies the switching condition, the main control chip 110 outputs the shutdown signal to the external charging device again, so that the external charging device stops outputting the second power supply voltage to the power supply control module 130, and the power supply control module 130 switches to output the first power supply voltage to the power supply module 120.
The switching condition may be understood as a condition that the first power supply voltage is not reduced to the protection threshold again in a short time when the main control chip 110 is switched to the first power supply voltage. The switching condition that the first power supply voltage needs to satisfy may be that the first power supply voltage is greater than a preset switching threshold. Obviously, the preset switching threshold is greater than the protection threshold and the preset low power threshold, and the specific setting value is not limited, and may be set according to the actual power supply parameters of the battery pack 200 and the main control chip 110. For example, in the present embodiment, in order to ensure system reliability and stability, the preset switching threshold is set to a voltage value at which the battery pack 200 is fully charged. During the charging of the battery pack 200, the battery management system does not consume the electric power of the battery pack 200, but obtains the power supply from the external charging device, thereby reducing the capacity consumption of the battery pack 200 itself.
The manner of acquiring the operating parameters of the battery pack 110 by the main control chip 110 is not unique, and in one embodiment, the battery management system further includes a front-end monitoring chip 140, and the front-end monitoring chip 140 connects the battery pack 200 and the main control chip 110. Specifically, the front-end monitoring chip 140 may be connected to each cell in the battery pack 200, respectively, to obtain the cell voltage, the temperature, the current, and other parameter values. Or directly connect the total positive terminal B + and the total negative terminal B-of the battery pack 200, and acquire the parameters of the battery pack 200 such as the overall voltage, current and temperature. At the main control chip 110In the electrical state, the front-end monitor chip 140 can pass through I with the main control chip 110 2 And C, performing bidirectional data communication, sending the working parameters acquired in real time to the main control chip 110, providing a data basis for monitoring and controlling the working state of the battery pack 200 for the main control chip 110, and better realizing the management of the battery pack 200.
In one embodiment, as shown in fig. 2, the power supply control module 130 includes a voltage output circuit 131, a low voltage identification circuit 132, a power supply control circuit 133 and a low voltage charging circuit 134, the voltage output circuit 131 connects the battery pack 200, the low voltage identification circuit 132 and the power supply control circuit 133, the low voltage identification circuit 132 connects the battery pack 200, the external charging device and the power supply control circuit 133, the power supply control circuit 133 connects the battery pack 200 and the power supply module 120, and the low voltage charging circuit 134 connects the low voltage identification circuit 132, the external charging device and the power supply module 120.
The voltage output circuit 131 is used for connecting the total positive terminal B + and the total negative terminal B-of the battery pack 200 to obtain a first power supply voltage, converting the first power supply voltage into an internal power supply voltage of 3.3V, and outputting the internal power supply voltage to the low voltage identification circuit 132 and the power supply control circuit 133 through the VCC _ EN terminal. The low voltage identification circuit 132 is configured to compare the first power supply voltage of the battery pack 200 with the internal power supply voltage output by the voltage output circuit 131, and output the comparison result to the power supply control circuit 133. The power supply control circuit 133 is configured to control whether to output the first power supply voltage of the battery pack 200 to the power module 120 according to the comparison result output by the low voltage identification circuit 132. When the first power supply voltage continuously decreases to the protection threshold and the power supply control circuit 133 stops outputting the first power supply voltage to the power module 120, the low voltage charging circuit 134 is configured to connect to an external charging device to obtain the second power supply voltage for power supply.
As shown in fig. 3, in one embodiment, the voltage output circuit includes a voltage dividing unit and a voltage stabilizing unit, the voltage dividing unit connects the battery pack and the voltage stabilizing unit, and the voltage stabilizing unit connects the low voltage identification circuit and the power supply control circuit.
The voltage division unit comprises a resistor R1, a resistor R2, a voltage stabilizing diode D1, a triode Q1 and a triode Q2. After the resistor R1 is connected with the resistor R2 in series, the other end of the resistor R1 is connected with the total positive terminal B + of the battery pack, the other end of the resistor R2 is connected with the total negative terminal B-of the battery pack through the voltage stabilizing diode D1 which is connected in the reverse direction, and the first power supply voltage is obtained and divided. The common end of the resistor R1 and the resistor R2 after being connected in series is simultaneously connected with the collecting electrodes of the triode Q1 and the triode Q2, the other end of the resistor R2 is also connected with the base electrode of the triode Q1, the emitting electrode of the triode Q1 is connected with the base electrode of the triode Q2, and the collecting electrode of the triode Q2 is connected with the voltage stabilizing unit. After the triode Q1 and the triode Q2 are conducted by the divided first power supply voltage, the divided first power supply voltage is output to the voltage stabilizing unit.
The voltage stabilizing unit comprises a resistor R3, a resistor R4, a voltage stabilizing diode D2, a voltage stabilizing diode D3, a capacitor C1, a capacitor C2 and a linear voltage stabilizer U1. A voltage stabilizing diode D2 is connected IN parallel with a capacitor C1, the anode of the voltage stabilizing diode D2 is connected with the total negative terminal B of the battery pack, the cathode of the voltage stabilizing diode D2 is connected with the collector of a triode Q2 through a resistor R3, the cathode of the voltage stabilizing diode D2 is connected with the IN end of a linear voltage stabilizer U1 through a resistor R4, the GND end of the linear voltage stabilizer U1 is connected with the total negative terminal B of the battery pack, the voltage stabilizing diode D3 is connected with a capacitor C2 IN parallel, the anode of the voltage stabilizing diode D3 is connected with the total negative terminal B of the battery pack, the cathode of the voltage stabilizing diode D3 is connected with the OUT end of the linear voltage stabilizer U1, and the OUT end of the linear voltage stabilizer U1 is connected with the low voltage identification circuit and the power supply control circuit through a VCC _ EN terminal.
In one embodiment, as shown in fig. 4, the low voltage identification circuit includes a comparator U2, a first voltage dividing unit and a second voltage dividing unit, the comparator U2 connects the voltage stabilizing unit, the first voltage dividing unit, the second voltage dividing unit and the power supply control circuit, the first voltage dividing unit connects the battery pack, and the second voltage dividing unit connects the voltage stabilizing unit and the low voltage charging circuit.
The first voltage division unit comprises a resistor R5, a resistor R6, a resistor R7 and a capacitor C3. The second voltage division unit comprises a resistor R8, a resistor R9, a diode D4 and a capacitor C4. After the resistor R5, the resistor R6 and the resistor R7 are sequentially connected IN series, the other end of the resistor R5 is connected with the total positive terminal B + of the battery pack, the common end of the resistor R6 and the resistor R7 is connected with the IN + end of the comparator U2, the other end of the resistor R7 is connected with the total negative terminal B-, and the capacitor C3 is connected with the resistor R7 IN parallel. After the resistor R8 and the resistor R9 are connected IN series, the other end of the resistor R8 is connected with the cathode of the diode D4 and the low-voltage charging circuit, the anode of the diode D4 is connected with a VCC _ EN terminal, the other end of the resistor R9 is connected with the total negative terminal B of the battery pack, the common end of the resistor R8 and the resistor R9 is connected with the IN-end of the comparator U2, and the capacitor C4 is connected with the resistor R9 IN parallel. The VCC end of the comparator U2 is connected with the VCC _ EN terminal, the VSS end of the comparator U2 is connected with the total negative terminal B-of the battery pack, and the OUT end of the comparator U2 is used for outputting the comparison result to the power supply control circuit.
The comparator U2 is used for comparing the voltage division result of the first power supply voltage of the battery pack connected to the IN + terminal of the comparator through the first voltage division unit with the voltage division result of the internal power supply voltage output by the voltage output circuit connected to the IN-terminal of the comparator through the second voltage division unit. When the input of the IN + terminal is greater than the input of the IN-terminal, that is, the voltage division result of the first power supply voltage by the first voltage division unit is greater than the voltage division result of the internal power supply voltage by the second voltage division unit, the output of the OUT terminal of the comparator U2 is high. When the input of the IN + terminal is smaller than the input of the IN-terminal, that is, the voltage division result of the first power supply voltage by the first voltage division unit is smaller than the voltage division result of the internal power supply voltage by the second voltage division unit, the output of the OUT terminal of the comparator U2 is at a low level.
In one embodiment, as shown in fig. 4, the power supply control circuit includes a first switch unit and a second switch unit, the first switch unit connects the comparator U2, the voltage stabilizing unit and the second switch unit, and the second switch unit connects the battery pack and the power module.
The first switch unit includes a resistor R12, a resistor R13, a resistor R14, a transistor Q3, and a transistor Q5. The second switch unit comprises a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a zener diode D6, a diode D7, a diode D9, a triode Q6, a MOS transistor Q7(P channel type) and a capacitor C5. The base of the triode Q3 is connected with the OUT end of the comparator U2 through a resistor R12, the emitter of the triode Q3 is connected with the total negative terminal B of the battery pack, the collector of the triode Q3 is connected with the base of the triode Q5 through a resistor R13, the base of the triode Q5 is also connected with the VCC _ EN terminal through a resistor R14, the emitter of the triode Q5 is connected with the VCC _ EN terminal, the collector of the triode Q5 is connected with the base of the triode Q6 through a resistor R15 and a diode D7 in sequence, the base of the triode Q6 is also connected with the total negative terminal B of the battery pack through a resistor R19 and a capacitor C5 respectively, the emitter of the triode Q6 is connected with the total negative terminal B of the battery pack, the collector of the triode Q6 is connected with the gate of the MOS tube Q7 through a resistor R17, the gate of the MOS tube Q7 is also connected with the total negative terminal B + of the battery pack through a resistor R464 and a source of the MOS tube Q7 is connected with the total negative terminal B +, 7, and the total negative terminal B +,6854 of the battery pack, the drain of the MOS transistor Q7 is connected to the BAT + terminal of the power module via a diode D9.
The base of triode Q3 passes through resistance R12 and connects the OUT end of comparator U2 and obtains the comparison result, when the comparison result is the high level, triode Q3 switches on with triode Q5 in proper order, export the inside supply voltage of voltage output circuit output for triode Q6, triode Q6 switches on the back and switches into the low level with MOS pipe Q7's grid, MOS pipe Q7 switches on, with the total positive terminal B + of group battery and the BAT + terminal intercommunication of power module, export first supply voltage to power module. On the contrary, when the comparison result is a low level, the triode Q3 and the triode Q5 are sequentially cut off, the internal power supply voltage output by the voltage output circuit is not output to the triode Q6, the triode Q6 is cut off, the gate of the MOS transistor Q7 is switched to a high level connected with the total positive terminal B + of the battery pack, the MOS transistor Q7 is cut off, and the first power supply voltage of the total positive terminal B + of the battery pack stops being output to the power supply module.
IN addition, the power supply control circuit further comprises a resistor R10, a resistor R11 and a MOS tube Q4 (of an N-channel type), wherein the grid electrode of the MOS tube Q4 is connected with the OUT end of the comparator U2 through a resistor R11, the source electrode of the MOS tube Q4 is connected with the total negative terminal B of the battery pack, and the drain electrode of the MOS tube Q4 is connected with the IN-end of the comparator U2 through a resistor R10. The total positive terminal B + of the battery pack is connected with the low-power identification circuit power supply control circuit through the magnetic bead FB1 and is used for suppressing high-frequency noise and spike interference on a signal line and a power line.
In one embodiment, as shown in fig. 4, the low voltage charging circuit includes a first conduction pipe and a second conduction pipe, the external charging device is connected to the power module through the first conduction pipe, and the external charging device is connected to the second voltage dividing unit through the second conduction pipe. The first conduction tube is a diode D8, and the second conduction tube is a diode D5. The positive terminal C + of the external charging device is connected to the BAT + terminal of the power module through the diode D8, and the second power supply voltage is transmitted to the power module for power supply. IN addition, the positive terminal C + of the external charging device is further connected to the other end of the resistor R8 of the second voltage dividing unit through a diode D5, and is used for dividing the second power supply voltage through the second voltage dividing unit and inputting the divided voltage into the IN-terminal of the comparator U2 while supplying power to the power module through the second power supply voltage. Because second supply voltage is greater than the inside supply voltage of voltage output circuit output, diode D4 can not switch on, and the rethread is to the design of partial pressure value in the first partial pressure unit, guarantees to be in the in-process that continuously charges the group battery, can not supply power for power module through the first supply voltage that power supply control module automatic switch over to, when guaranteeing to have second supply voltage, continuously adopts second supply voltage to supply power for power module.
In one embodiment, as shown in fig. 1, the power module 120 includes a first power source DCDC1, a second power source DCDC2 and a linear regulator LDO, the first power source DCDC1 is connected to the main control chip 110 through the linear regulator LDO, the first power source DCDC1 is further connected to the power control module 130 and the second power source DCDC2, and the second power source DCDC2 is connected to the main control chip 110 and the relay 300.
The first power DCDC1 is configured to step down the first power supply voltage or the second power supply voltage output by the power supply control module 130, and output the first power supply voltage or the second power supply voltage to the linear regulator LDO and the second power DCDC2, respectively. The linear regulator LDO is configured to perform linear voltage stabilization on the voltage stepped down by the first power supply DCDC1, and output a voltage meeting the power supply requirement of the main control chip 110. The second power source DCDC2 is used to boost the voltage of the first power source DCDC1 after being stepped down to the power supply voltage required by the relay 300, and to provide the power source required by the exciting coil of the relay 300. In addition, the second power source DCDC2 is also used for connecting the main control chip 110 to receive an enable signal, and when the enable signal is present, the power source is provided for the excitation coil of the relay 300.
In one embodiment, as shown in fig. 1 and 5, a battery device is provided, including: the battery management system 100 is connected with the battery pack 200, an external charging device and a control end of the relay 300, one contact terminal of the relay 300 is connected with the battery pack 200, and the other contact terminal of the relay 300 is connected with the external charging device or a load through the external terminal.
The battery pack 200 may be formed of a single battery cell, or may be formed of a plurality of battery cells (C1 to Cx) connected in series. The battery pack 200 comprises a total positive terminal B + and a total negative terminal B-after being connected in series, and the total positive terminal B + and the total negative terminal B-of the battery pack 200 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 200 is adopted to supply power to the load; it is also possible to connect an external charging device to form a charging loop, and charge the battery pack 200 with the external charging device. A relay 300 is further provided on a connection line between the overall positive terminal B + and the external positive terminal P + or between the overall negative terminal B-and the external negative terminal P-of the battery pack 200. For example, in the present embodiment, the control terminal of the relay 300 is connected to the power management system, one contact terminal of the relay 300 is connected to the overall negative terminal B-of the battery pack 200, and the other contact terminal of the relay 300 is connected to the external charging device or load through the external negative terminal P-.
The battery management system may be used to monitor and manage the operating state of the battery pack 200, i.e., control and monitor the operating states of the discharging circuit and the charging circuit of the battery pack 200. When it is detected that the first power supply voltage of the battery pack 200 is lower than the preset low power threshold, the power supply to the control terminal of the relay 300 is stopped, so that the relay 300 is turned off, and the discharging loop of the battery pack 200 is further turned off. Meanwhile, a reminding message is also sent to remind the user to charge the battery pack 200 in time. When the user still does not charge in time, the first power supply voltage of the battery pack 200 will be continuously reduced due to the power consumption of the main control chip and the static self-power consumption of the main control chip. When the voltage continuously decreases to the protection threshold value, the power management system automatically cuts off the acquisition of the first power supply voltage, switches to connect the positive terminal C + and the negative terminal C-of the external charging device to acquire a second power supply voltage, supplies power to the control end of the relay 300, enables the relay 300 to be switched on, further enables the charging loop of the battery pack 200 to be switched on, and charges the battery pack 200 by using the external charging device or other external power sources.
The specific limitations of the one or more embodiments of the battery device provided above can be referred to the limitations of the power management system, and are not described herein again.
In this embodiment, when the battery pack loses power seriously, the external charging equipment provides the second power supply voltage to the power management system so that the relay is recovered to be switched on, the charging loop of the battery pack and the external charging equipment is communicated, and the problems that the battery cannot be recovered through external charging and is inconvenient to use after being under-voltage and particularly when the battery voltage reaches 0V are effectively solved.
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 management system, comprising: the battery charging system comprises a main control chip, a power supply module and a power supply control module, wherein the power supply control module is connected with a battery pack of a battery device, external charging equipment and the power supply module, the power supply module is connected with the main control chip and a relay of the battery device, and the main control chip is also connected with the battery pack and the external charging equipment;
when a first power supply voltage of the battery pack is lower than a protection threshold value, the power supply control module stops outputting the first power supply voltage to the power supply module so as to enable the main control chip to lose power;
when the main control chip loses power, the main control chip stops outputting a turn-off signal to the external charging equipment so that the external charging equipment outputs a second power supply voltage to the power supply control module;
and the power supply control module outputs the second power supply voltage to the power supply module so as to enable the main control chip to be electrified and the relay to be switched to a conducting state, and the battery pack is charged through the external charging equipment.
2. The battery management system according to claim 1, wherein when detecting that the first power supply voltage of the battery pack satisfies a switching condition, the main control chip outputs the shutdown signal to the external charging device again, so that the external charging device stops outputting the second power supply voltage to the power supply control module, and the power supply control module switches to output the first power supply voltage to the power supply module.
3. The battery management system of claim 1, wherein the power supply control module comprises a voltage output circuit, a low voltage identification circuit, a power supply control circuit, and a low voltage charging circuit, the voltage output circuit connects the battery pack, the low voltage identification circuit, and the power supply control circuit, the low voltage identification circuit connects the battery pack, the external charging device, and the power supply control circuit, the power supply control circuit connects the battery pack with the power supply module, and the low voltage charging circuit connects the low voltage identification circuit, the external charging device, and the power supply module.
4. The battery management system according to claim 3, wherein the voltage output circuit includes a voltage dividing unit and a voltage stabilizing unit, the voltage dividing unit connects the battery pack and the voltage stabilizing unit, and the voltage stabilizing unit connects the low voltage identification circuit and the power supply control circuit.
5. The battery management system of claim 4, wherein the low voltage identification circuit comprises a comparator, a first voltage dividing unit and a second voltage dividing unit, the comparator connects the voltage stabilizing unit, the first voltage dividing unit, the second voltage dividing unit and the power supply control circuit, the first voltage dividing unit connects the battery pack, and the second voltage dividing unit connects the voltage stabilizing unit and the low voltage charging circuit.
6. The battery management system according to claim 5, wherein the power supply control circuit comprises a first switch unit and a second switch unit, the first switch unit connects the comparator, the voltage stabilizing unit and the second switch unit, and the second switch unit connects the battery pack and the power module.
7. The battery management system according to claim 5, wherein the low voltage charging circuit comprises a first conduction pipe and a second conduction pipe, the external charging device is connected to the power module through the first conduction pipe, and the external charging device is connected to the second voltage division unit through the second conduction pipe.
8. The battery management system according to claim 1, wherein the power module comprises a first power source, a second power source and a linear regulator, the first power source is connected to the main control chip through the linear regulator, the first power source is further connected to the power supply control module and the second power source, and the second power source is connected to the main control chip and the relay.
9. The battery management system according to any one of claims 1 to 8, further comprising a front-end monitoring chip, wherein the front-end monitoring chip connects the battery pack with the main control chip.
10. A battery device, comprising: the battery management system of any one of claims 1-9, the battery management system is connected with the battery pack, the external charging device and the control terminal of the relay, one contact terminal of the relay is connected with the battery pack, and the other contact terminal of the relay is connected with the external charging device or the load through the external terminal.
CN202210438819.0A 2022-04-25 2022-04-25 Battery management system and battery device Pending CN114865739A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116466637A (en) * 2023-04-19 2023-07-21 东方空间技术(山东)有限公司 Power distribution control system and method of aircraft and flight control computer
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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116466637A (en) * 2023-04-19 2023-07-21 东方空间技术(山东)有限公司 Power distribution control system and method of aircraft and flight control computer
CN116466637B (en) * 2023-04-19 2024-01-12 东方空间技术(山东)有限公司 Power distribution control system and method of aircraft and flight control computer
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
CN116666788B (en) * 2023-07-31 2023-10-27 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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