A battery management system

Abstract

An embodiment of the present invention discloses a battery management system, comprising: a battery pack, a power measurement device and a microprocessor; the power measurement device is respectively connected to the battery pack and the microprocessor, and is used for detecting voltage, current and temperature information of the battery pack, determining the battery power of the battery pack, and transmitting the battery power to the microprocessor; the microprocessor is used for generating a first control signal for battery management according to the battery power; the battery pack includes at least two series-connected batteries and is also connected to the microprocessor, and is used for supplying power to the power measurement device and the microprocessor. The technical solution of the embodiment of the present invention calculates the battery power of the battery pack as a whole, improves the accuracy of power calculation, realizes high-precision management of a multi-battery battery pack, improves the flexibility of battery management, and reduces the complexity of information processing of the microprocessor at the same time.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of battery management, and in particular, to a battery management system. Background Art

[0002] With the gradual rise of agricultural drones, the demand for power by drones has been increasing day by day. The increase in power means an increase in the number of batteries in the battery pack. Due to technical and product structure limitations, there are not many multi-battery management solutions for drones currently.

[0003] Currently, for the management of a battery pack formed by connecting multiple batteries in series in a drone, the microprocessor of the drone is often used to independently manage each battery in the battery pack, obtain information such as the current, voltage, and temperature corresponding to each battery, and then determine the power of each battery and adjust the charging and discharging of different batteries.

[0004] However, in the existing management technology, each battery in the battery pack is not regarded as a whole. The required calculation amount for individual control is relatively large and there are many errors, which increases the complexity of multi-battery pack management and it is difficult to achieve flexible and high-precision battery management. Summary of the Invention

[0005] The present invention provides a battery management system to achieve high-precision management of a multi-battery series battery pack, so that the power accuracy of the battery pack can meet the safety requirements of the drone, improve the flexibility of battery management, and reduce the management complexity.

[0006] Embodiments of the present invention provide a battery management system, including: a battery pack, a power measurement device, and a microprocessor;

[0007] The power measurement device is respectively connected to the battery pack and the microprocessor, and is used to detect the voltage, current, and temperature information of the battery pack, determine the battery power of the battery pack, and transmit the battery power to the microprocessor;

[0008] The microprocessor is used to generate a first control signal for battery management according to the battery power;

[0009] The battery pack includes at least two series-connected batteries, and is also connected to the microprocessor, and is used to supply power to the power measurement device and the microprocessor.

[0010] Further, the power measurement device includes: a current-voltage sampling module, a first temperature sensor, and a power measurement chip;

[0011] The current-voltage sampling module is connected to the pins of the power measurement chip, and is used to obtain the sampled voltage and sampled current of the battery pack, and send the sampled voltage and sampled current to the power measurement chip;

[0012] The first temperature sensor is arranged at the theoretical average temperature inside the battery pack. The output end of the first temperature sensor is connected to the pin of the battery charge metering chip, and is used for collecting the average temperature inside the battery pack and sending the average temperature to the battery charge metering chip;

[0013] The battery charge metering chip is respectively connected to the current and voltage sampling module, the first temperature sensor and the microprocessor through different pins, and is used for determining the battery charge of the battery pack according to the received sampling voltage, sampling current and average temperature, and transmitting the battery charge to the microprocessor;

[0014] Wherein, the battery charge metering chip is a single-cell battery charge metering chip.

[0015] Further, the current and voltage sampling module includes:

[0016] A current detection resistor and a voltage dividing resistor, wherein:

[0017] The voltage dividing resistor is connected in parallel at both ends of the battery pack and is used for obtaining the sampling voltage. The sampling voltage is the ratio of the output voltage of the battery pack to the number of batteries in the battery pack;

[0018] The current detection resistor is directly connected in series in the main circuit and is connected in series with one end of the battery pack, and is used for obtaining the sampling current. The sampling current is the current flowing through the battery pack, and the main circuit is a circuit formed by connecting the output positive electrode, the battery pack positive electrode, the battery pack negative electrode and the output negative electrode.

[0019] Further, the microprocessor is specifically used for:

[0020] If the battery charge is less than the preset first charge threshold, determining the generated pre-charge signal as the first control signal;

[0021] If the battery charge is greater than or equal to the preset first charge threshold and less than the preset second charge threshold, determining the generated main circuit switch closing signal as the first control signal;

[0022] If the battery charge is greater than or equal to the preset second charge threshold and less than the preset third charge threshold, determining the generated pre-discharge signal as the first control signal;

[0023] If the battery charge is greater than or equal to the preset third charge threshold, determining the generated main circuit switch opening signal as the first control signal.

[0024] Further, the battery management system further includes: an analog front-end device;

[0025] An analog front-end device, which is respectively connected to a battery pack and a microprocessor, is used to detect the voltage and current of each battery in the battery pack and the highest temperature in the battery pack, generate a second control signal for battery management according to each voltage, each current and the highest temperature, and transmit each voltage, each current and the highest temperature to the microprocessor;

[0026] Correspondingly, the microprocessor is further used to generate a third control signal for battery management according to each voltage, each current and each highest temperature.

[0027] Further, the analog front-end device includes: a second temperature sensor and an analog front-end chip;

[0028] The second temperature sensor is arranged at the theoretical highest temperature in the battery pack. The output end of the second temperature sensor is connected to the pin of the analog front-end chip, and is used to collect the highest temperature in the battery pack and send the highest temperature to the analog front-end chip;

[0029] The analog front-end chip is respectively connected to the second temperature sensor, the microprocessor and the positive electrodes of each battery in the battery pack through different pins, and is used to generate a second control signal for battery management according to the received highest temperature and the obtained voltage and current of each battery in the battery pack, and transmit each voltage, each current and the highest temperature to the microprocessor.

[0030] Further, the analog front-end chip is specifically used for:

[0031] If each current is less than a preset first current threshold and the highest temperature is less than a preset first temperature threshold, determine the generated pre-charge signal as the second control signal;

[0032] If each current is greater than or equal to the preset first current threshold and less than the preset second current threshold, and the highest temperature is less than the preset first temperature threshold, determine the generated main circuit switch closing signal as the second control signal;

[0033] If each current is greater than or equal to the preset second current threshold and less than the preset third current threshold, and the highest temperature is less than the preset first temperature threshold, determine the generated pre-discharge signal as the second control signal;

[0034] If any one current is greater than or equal to the preset third current threshold, or the highest temperature is greater than or equal to the preset first temperature threshold, determine the generated main circuit switch opening signal as the second control signal;

[0035] If the difference between any two voltages is greater than a preset voltage difference, determine the generated equalization enabling signal as the second control signal.

[0036] Further, the microprocessor is further used for:

[0037] If each voltage is less than the preset first voltage threshold, each current is less than the preset fourth current threshold, and the highest temperature is less than the preset second temperature threshold, determine the generated pre-charge signal as the third control signal;

[0038] If each voltage is greater than or equal to the preset first voltage threshold and less than the preset second voltage threshold, each current is greater than or equal to the preset fourth current threshold and less than the preset fifth current threshold, and the highest temperature is less than the preset second temperature threshold, determine the generated main circuit switch closing signal as the third control signal;

[0039] If each voltage is greater than or equal to the preset second voltage threshold and less than the preset third voltage threshold, each current is greater than or equal to the preset fifth current threshold and less than the preset sixth current threshold, and the highest temperature is less than the preset second temperature threshold, determine the generated pre-discharge signal as the third control signal;

[0040] If any voltage is greater than or equal to the preset third voltage threshold, any current is greater than or equal to the preset sixth current threshold, or the highest temperature is greater than or equal to the preset second temperature threshold, determine the generated main circuit switch opening signal as the third control signal;

[0041] Among them, the preset fourth current threshold is less than the preset first current threshold, the preset fifth current threshold is less than the preset second current threshold, the preset sixth current threshold is less than the preset third current threshold, and the preset second temperature threshold is less than the preset first temperature threshold.

[0042] Furthermore, the battery management system further includes: a battery pack equalization circuit;

[0043] The battery pack equalization circuit is connected to the analog front-end device and is respectively connected to each battery in the battery pack, and is used to perform voltage equalization on each battery when receiving the second control signal that is the equalization enabling signal sent by the analog front-end device.

[0044] Furthermore, the battery management system further includes: a reset chip;

[0045] The reset chip is connected to the reset pin of the microprocessor and is used to send a reset signal to the reset pin when detecting a microprocessor fault, so that the reset pin is at a low level to reset the microprocessor.

[0046] Furthermore, the battery management system further includes: a main circuit switch and a pre-charge / discharge module;

[0047] The main circuit switch is directly connected in series to the main circuit and is respectively connected to the microprocessor and the analog front-end device, and is used to close when receiving the main circuit switch closing signal to connect the main circuit, and to open when receiving the main circuit switch opening signal to disconnect the main circuit;

[0048] The pre - charge and discharge module is directly connected in series to the main circuit, connected in parallel with the main - circuit switch, and respectively connected to the micro - processor and the analog front - end device. It is used to close the pre - charge switch when receiving a pre - charge signal to pre - charge the battery pack, and close the pre - discharge switch when receiving a pre - discharge signal to pre - discharge the battery pack;

[0049] Among them, the main - circuit switch closing signal, the main - circuit switch opening signal, the pre - charge signal, and the pre - discharge signal are the first control signal and the third control signal from the micro - processor, and the second control signal from the analog front - end device.

[0050] An embodiment of the present invention provides a battery management system, including: a battery pack, a power - quantity measurement device, and a micro - processor; the power - quantity measurement device is respectively connected to the battery pack and the micro - processor, and is used to detect the voltage, current, and temperature information of the battery pack, determine the battery power of the battery pack, and transmit the battery power to the micro - processor; the micro - processor is used to generate a first control signal for battery management according to the battery power; the battery pack includes at least two series - connected batteries and is also connected to the micro - processor to supply power to the power - quantity measurement device and the micro - processor. By adopting the above - mentioned technical solution, the voltage, current, and temperature information of the battery pack composed of multiple batteries is obtained through the power - quantity measurement device, and then the battery power of the battery pack is determined according to the above - mentioned voltage, current, and temperature information. Calculating the battery power of the battery pack as a whole improves the accuracy of power calculation. There is no need for the micro - processor to directly receive the working information of each battery in the battery pack for power calculation. Furthermore, the micro - processor generates higher - accuracy control information according to the battery power, realizing high - precision management of the multi - battery battery pack, improving the flexibility of battery management, and at the same time reducing the complexity of micro - processor information processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0052] Figure 1 is a schematic structural diagram of a battery management system in Embodiment 1 of the present invention;

[0053] Figure 2 is a schematic structural diagram of a power - quantity measurement device in Embodiment 1 of the present invention;

[0054] Figure 3 is a schematic structural diagram of the current - voltage sampling module in Embodiment 1 of the present invention;

[0055] Figure 4It is a schematic structural diagram of a battery management system in the second embodiment of the present invention;

[0056] Figure 5 It is a schematic structural diagram of an analog front-end device in the second embodiment of the present invention;

[0057] Figure 6 It is a circuit example diagram of a battery management system in the second embodiment of the present invention. Detailed implementation manners

[0058] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings rather than all the structures. In addition, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0059] Embodiment 1

[0060] Figure 1 It is a schematic structural diagram of a battery management system provided in Embodiment 1 of the present invention. The battery power of the battery pack is determined by the power measurement device, and then the microprocessor generates a control signal according to the battery power to realize the charge and discharge management of the battery pack. As Figure 1 shown, the battery management system includes: a battery pack 10, a power measurement device 11, and a microprocessor 12, wherein:

[0061] The power measurement device 11 is respectively connected to the battery pack 10 and the microprocessor 12, and is used to detect the voltage, current and temperature information of the battery pack 10, determine the battery power of the battery pack 10, and transmit the battery power to the microprocessor 12.

[0062] The microprocessor 12 is used to generate a first control signal for battery management according to the battery power.

[0063] The battery pack 10 includes at least two series-connected batteries 101, and is also connected to the microprocessor 12, and is used to supply power to the power measurement device 11 and the microprocessor 12.

[0064] In this embodiment, the power metering device 11 can be understood as a metering device that calculates and determines the battery power of the battery pack 10 based on information such as the battery current, voltage, and temperature obtained. The microprocessor 12 can be understood as a central processing unit composed of one or several large-scale integrated circuits. The integrated circuits therein can perform the functions of a control unit and an arithmetic logic unit, can realize signal interaction with other external devices, and can then generate corresponding instructions according to the received external information and logical operation rules, and send the instructions to the corresponding devices, so that the corresponding devices perform corresponding operations according to the received instructions to realize the control of the charging and discharging of the battery pack 10. The battery pack 10 can be understood as a power source formed by at least two batteries 101 connected in series. Optionally, the battery pack 10 in this application can be formed by more than 8 batteries 101 connected in series and is a power source applied to an unmanned aerial vehicle.

[0065] Specifically, the battery pack 10 is respectively connected to the power metering device 11 and the microprocessor 12 for power supply, and is used to supply power to the power metering device 11 and the microprocessor 12 respectively; the power metering device 11 is respectively connected to the battery pack 10 and the microprocessor 12 for communication. The power metering device 11 collects the voltage, current, and temperature information of the battery pack 10 through different sampling resistors arranged therein. Among them, regarding the battery pack 10 as a whole, the collected voltage, current, and temperature information are the average voltage, average current, and average temperature of the battery pack 10. The power metering device 11 calculates the battery power of the battery pack 10 according to the obtained average voltage, average current, and average temperature, and sends the battery power to the microprocessor 12; the microprocessor 12 generates a first control signal for battery management according to the received battery power magnitude and the corresponding relationship between the preset power thresholds, and transmits the first control signal to the corresponding hardware module that needs to be controlled through the output interface to realize the control of the charging and discharging of the battery pack 10.

[0066] Furthermore, Figure 2 FIG. 1 is a schematic structural diagram of a power metering device provided in Embodiment 1 of the present invention. Among them, the power metering device 11 includes: a current and voltage sampling module 111, a first temperature sensor 112, and a power metering chip 113.

[0067] In this embodiment, the current and voltage sampling module 111 is connected to the pins of the power metering chip 113 and is used to obtain the sampled voltage and sampled current of the battery pack 10, and send the sampled voltage and sampled current to the power metering chip 113.

[0068] In this embodiment, the first temperature sensor 112 is arranged at the theoretical average temperature inside the battery pack 10. The output end of the first temperature sensor 112 is connected to the pins of the power metering chip 113 and is used to collect the average temperature inside the battery pack 10 and send the average temperature to the power metering chip 113.

[0069] In this embodiment, the power measurement chip 113 is connected to the current and voltage sampling module 111, the first temperature sensor 112, and the microprocessor 12 through different pins, and is used to determine the battery power of the battery pack 10 according to the received sampling voltage, sampling current, and average temperature, and transmit the battery power to the microprocessor 12.

[0070] Among them, the power measurement chip 113 is a single-battery power measurement chip.

[0071] Specifically, the input end of the current and voltage sampling module 111 is connected to the battery pack 10, and is used to obtain the sampling voltage and sampling current of the battery pack 10. The output end of the current and voltage sampling module 111 is connected to the pin of the power measurement chip 113, and the sampling voltage and sampling current are sent to the power measurement chip 113 through the above-mentioned pin; the first temperature sensor 112 is set at the theoretical average temperature inside the battery pack 10. It can be considered that the temperature collected by the first temperature sensor 112 is the average temperature of each battery 101 in the battery pack 10. The output end of the first temperature sensor 112 is connected to the power measurement chip 113 through a pin, and the collected average temperature is sent to the power measurement chip 113 through this pin; the power measurement chip 113 is connected to the microprocessor 12 through a pin. After calculating the battery power of the battery pack 10 according to the received sampling voltage, sampling current, and average temperature, the battery power is transmitted to the microprocessor 12 through this pin. Among them, the pins of the power measurement chip 113 used to connect to the current and voltage sampling module 111, the first temperature sensor 112, and the microprocessor 12 are all different, and the power measurement chip 113 is a single-battery power measurement chip.

[0072] In the embodiment of the present invention, since the power measurement chip used in the power measurement device is a single-battery power measurement chip with a higher-precision power measurement algorithm, by taking the battery pack composed of multiple batteries connected in series as a whole and using the single-battery power measurement chip to calculate its battery power, the calculated battery power has higher precision. Furthermore, the microprocessor can determine a first control signal more suitable for battery management according to the battery power, improving the effectiveness of battery management.

[0073] Furthermore, Figure 3 FIG. 16 is a schematic structural diagram of a current and voltage sampling module provided in Embodiment 1 of the present invention. Among them, the current and voltage sampling module 111 includes: a current detection resistor 111a and a voltage dividing resistor 111b.

[0074] The voltage dividing resistor 111b is connected in parallel to both ends of the battery pack 10 and is used to obtain the sampling voltage.

[0075] The current detection resistor 111a is directly connected in series to the main circuit and is serially connected to one end of the battery pack 10 for obtaining a sampled current.

[0076] Among them, the sampled voltage is the ratio of the output voltage of the battery pack 10 to the number of batteries in the battery pack 10, the sampled current is the current flowing through the battery pack 10, and the main circuit is a circuit formed by connecting the output positive electrode, the battery pack positive electrode, the battery pack negative electrode, and the output negative electrode.

[0077] Specifically, when the main circuit is operating normally, the voltage dividing resistor 111b is connected in parallel across the two ends of the battery pack 10, that is, connected to the battery pack positive electrode and the battery pack negative electrode of the battery pack 10 respectively. The voltage across the voltage dividing resistor 111b is equal to the voltage across the battery pack 10. Two different pins in the charge measurement chip 113 are respectively connected to the two ends of the voltage dividing resistor 111b for obtaining the sampled voltage collected by the voltage dividing resistor 111b. Among them, the sampled voltage is the ratio of the voltage across the battery pack 10 to the number of batteries in the battery pack 10, that is, the average voltage of each battery in the battery pack 10; the current detection resistor 111a is connected in series in the main circuit. If one end of the current detection resistor 111a is connected to the battery pack positive electrode, the other end is connected to the output positive electrode. If one end of the current detection resistor 111a is connected to the battery pack negative electrode, the other end is connected to the output negative electrode. The current flowing through the current detection resistor 111a is the main circuit current, that is, the current flowing through each series-connected battery in the battery pack 10. Two different pins in the charge measurement chip 113 are respectively connected to the two ends of the current detection resistor 111a for obtaining the sampled current collected by the current detection resistor 111a.

[0078] Furthermore, the microprocessor 12 is specifically configured to:

[0079] If the battery power is less than a preset first power threshold, determine the generated pre-charge signal as the first control signal;

[0080] If the battery power is greater than the preset first power threshold and less than the preset second power threshold, determine the generated main circuit switch closing signal as the first control signal;

[0081] If the battery power is greater than the preset second power threshold and less than the preset third power threshold, determine the generated pre-discharge signal as the first control signal;

[0082] If the battery power is greater than the preset third power threshold, determine the generated main circuit switch opening signal as the first control signal.

[0083] In this embodiment, the pre-charge signal can be understood as a control signal for controlling the pre-charge of the battery pack 10; the main circuit switch closing signal can be understood as a control signal for controlling the closing of the main circuit switch so that the battery pack 10 can be charged and discharged normally; the pre-discharge signal can be understood as a control signal for controlling the pre-discharge of the battery pack 10; the main circuit switch opening signal can be understood as a control signal for controlling the opening of the main circuit switch so that the battery pack 10 stops charging and discharging.

[0084] In this embodiment, the preset first battery level threshold, the preset second battery level threshold, and the preset third battery level threshold can be understood as preset set battery level values that have a corresponding relationship with the control signals for controlling the battery pack.

[0085] Specifically, if the battery level is less than the preset first battery level threshold, it can be considered that the current battery pack has a low level. Since the battery pack has a high energy ratio, to avoid damaging the batteries in the battery pack 10, affecting the service life, or causing potential safety hazards, the microprocessor 12 can generate a first control signal with the content of the pre-charge signal, so that the battery pack 10 enters the pre-charge state; if the battery level is greater than or equal to the preset first battery level threshold and less than the preset second battery level threshold, it can be considered that the current battery pack can work directly. At this time, the microprocessor 12 can generate a first control signal with the content of the main circuit switch closing signal, so that the battery pack 10 works normally; if the battery level is greater than or equal to the preset second battery level threshold and less than the preset first battery level threshold, it can be considered that the current battery pack has an excessive level, which is not conducive to battery stability and storage, but has not reached the level where work needs to be stopped immediately. The microprocessor 12 can generate a first control signal with the content of the pre-discharge signal, so that the battery pack 10 enters the pre-discharge state to reduce the battery pack 10 level without affecting the normal operation of the circuit and reduce potential safety hazards; if the battery level is greater than or equal to the preset third battery level threshold, it can be considered that the current battery pack has an excessive level, which has affected the safety of the circuit operation and the circuit cannot be continuously connected for work. The microprocessor 12 can generate a first control signal with the content of the main circuit switch opening signal, so that the circuit is disconnected and the battery pack 10 stops working.

[0086] An embodiment of the present invention provides a battery management system, including: a battery pack, a power measurement device, and a microprocessor; the power measurement device is respectively connected to the battery pack and the microprocessor, and is used to detect the voltage, current, and temperature information of the battery pack, determine the battery power of the battery pack, and transmit the battery power to the microprocessor; the microprocessor is used to generate a first control signal for battery management according to the battery power; the battery pack includes at least two series-connected batteries, and is also connected to the microprocessor, and is used to supply power to the power measurement device and the microprocessor. By adopting the above technical solution, the voltage, current, and temperature information of the battery pack composed of multiple batteries is obtained through the power measurement device, and then the battery power of the battery pack is determined according to the above voltage, current, and temperature information. The battery pack is used as a whole to calculate its battery power, which improves the power calculation accuracy. There is no need for the microprocessor to directly receive the working information of each battery in the battery pack for power calculation, so that the microprocessor can generate higher-precision control information according to the battery power, realizing high-precision management of the multi-battery battery pack, improving the flexibility of battery management, and at the same time reducing the complexity of microprocessor information processing.

[0087] Embodiment 2

[0088] Figure 4 FIG. 7 is a schematic structural diagram of a battery management system provided by Embodiment 2 of the present invention. The technical solution of this embodiment is further refined on the basis of the above technical solutions. The battery management system further includes an analog front-end device 13, a battery pack equalization circuit 14, a reset chip 15, a main circuit switch 16, and a pre-charge and discharge module 17.

[0089] The analog front-end device 13 is respectively connected to the battery pack 10 and the microprocessor 12, and is used to detect the voltage, current of each battery 101 in the battery pack 10, and the highest temperature in the battery pack 10, generate a second control signal for battery management according to each voltage, each current, and the highest temperature, and transmit each voltage, each current, and the highest temperature to the microprocessor 12.

[0090] The microprocessor 12 is further used to generate a third control signal for battery management according to each voltage, each current, and each highest temperature.

[0091] The battery pack equalization circuit 14 is connected to the analog front-end device 13 and is respectively connected to each battery 101 in the battery pack 10, and is used to perform voltage equalization on each battery 101 when receiving the second control signal sent by the analog front-end device 13, which is an equalization enable signal.

[0092] The reset chip 15 is connected to the reset pin of the microprocessor 12, and is used to send a reset signal to the reset pin when detecting a failure of the microprocessor 12, so that the reset pin is at a low level to reset the microprocessor 12.

[0093] The main circuit switch 16 is directly connected in series to the main circuit and is respectively connected to the microprocessor 12 and the analog front-end device 13. It is used to close when receiving the main circuit switch closing signal to connect the main circuit, and to open when receiving the main circuit switch opening signal to disconnect the main circuit.

[0094] The pre-charge and discharge module 17 is directly connected in series to the main circuit, is connected in parallel with the main circuit switch 16, and is respectively connected to the microprocessor 12 and the analog front-end device 13. It is used to close the pre-charge switch when receiving the pre-charge signal to pre-charge the battery pack 10, and to close the pre-discharge switch when receiving the pre-discharge signal to pre-discharge the battery pack 10.

[0095] Among them, the main circuit switch closing signal, the main circuit switch opening signal, the pre-charge signal, and the pre-discharge signal are the first control signal and the third control signal from the microprocessor 12, and the second control signal from the analog front-end device 13.

[0096] Specifically, the analog front-end device 13 is respectively connected to each battery 101 in the battery pack 10 through wires, and is used to detect the voltage and current corresponding to each battery 101 in the battery pack 10, as well as the highest temperature in the battery pack 10 by the resistance sampling method. It determines the working state of the circuit and the battery pack 10 according to each voltage, each current, and the highest temperature, and generates a second control signal for battery management according to this working state. The output port of the analog front-end device 13 is also connected to the input port of the microprocessor 12 through wires, and is used to transmit the obtained voltages, currents, and the highest temperature to the microprocessor 12. Correspondingly, the microprocessor 12 can generate a third control signal for battery management according to the received voltages, currents, and the highest temperature according to the preset control conditions therein.

[0097] Specifically, the battery pack equalization circuit 14 is respectively connected to each battery 101 in the battery pack 10 and the analog front-end device 13 through different IO ports, and is used to perform voltage equalization on the connected batteries 101 when receiving the second control signal sent by the analog front-end device 13 and this second control signal is the equalization start signal, so as to solve the problem of voltage inconsistency caused by large current flight of each battery 101 in the battery pack 10 when it is not working. Optionally, the battery pack equalization circuit 14 can be a set of equalization circuits and voltage acquisition circuits, and the embodiments of the present invention do not limit this.

[0098] Specifically, the reset chip 15 can be a reset IC chip, which is connected to the reset pin of the microprocessor 12 through an IO port. When a failure of the microprocessor 12 is detected, the reset chip 15 sends a reset signal to the reset pin, so that the reset pin is at a low level to reset the microprocessor 12. By using the reset chip 15, the problem that the microprocessor 12 freezes due to the sudden up and down rotation of the drone during flight when the battery pack 10 is applied to the drone can be better solved.

[0099] Specifically, the main circuit switch 16 is directly connected in series to the main circuit, with one end connected to the positive or negative pole of the battery pack 10 and the other end connected to the output positive or negative pole. The input ports of the main circuit switch 16 are respectively connected to the output ports of the microprocessor 12 and the analog front-end device 13 through wires, and are used to receive the first control signal, the second control signal or the third control signal sent by the microprocessor 12 and the analog front-end device 13. When the received control signal is the main circuit switch closing signal, the main circuit switch 16 closes to connect the main circuit. When the received control signal is the main circuit switch opening signal, the main circuit switch 16 opens to disconnect the main circuit.

[0100] Specifically, the pre-charge and discharge module 17 is directly connected in series to the main circuit, with one end connected to the positive or negative pole of the battery pack 10 and the other end connected to the output positive or negative pole, and is connected in parallel with the main circuit switch 16. The input ports of the pre-charge and discharge module 17 are also respectively connected to the output ports of the microprocessor 12 and the analog front-end device 13 through wires, and are used to receive the first control signal, the second control signal or the third control signal sent by the microprocessor 12 and the analog front-end device 13. When the received control signal is the pre-charge signal, the pre-charge and discharge module 17 controls the pre-charge switch to close to pre-charge the battery pack 10. When the received control signal is the pre-discharge signal, the pre-charge and discharge module 17 controls the pre-discharge switch to close to pre-discharge the battery pack 10.

[0101] It should be clear that, as Figure 4 shown, the power communication output is the content output between the output positive and negative poles, and its output content can be provided by any module among the battery pack 10, the power measurement device 11, the microprocessor 12, the main circuit switch 16 and the pre-charge and discharge module 17.

[0102] Furthermore, Figure 5 FIG. 2 is a schematic structural diagram of an analog front-end device provided in the second embodiment of the present invention. Among them, the analog front-end device 13 includes: a second temperature sensor 131 and an analog front-end chip 132.

[0103] In this embodiment, the second temperature sensor 131 is disposed at the theoretical highest temperature within the battery pack 10. The output terminal of the second temperature sensor 131 is connected to the pin of the analog front-end chip 132, and is configured to collect the highest temperature within the battery pack 10 and send the highest temperature to the analog front-end chip 132.

[0104] In this embodiment, the analog front-end chip 132 is respectively connected to the second temperature sensor 131, the microprocessor 12, and the positive electrodes of the respective batteries 101 in the battery pack 10 through different pins, and is configured to generate a second control signal for battery management according to the received highest temperature, as well as the voltages and currents of the respective batteries 101 in the battery pack 10, and transmit the respective voltages, the respective currents, and the highest temperature to the microprocessor 12.

[0105] Specifically, the second temperature sensor 131 is disposed at the theoretical highest temperature within the battery pack 10. It can be considered that the temperature collected by the second temperature sensor 131 is the highest temperature within the battery pack 10. That is, the collected highest temperature can be used as the warning temperature of the battery pack 10. The output terminal of the second temperature sensor 131 is connected to the pin of the analog front-end chip 132, and the highest temperature can be sent to the analog front-end chip 132 through this connection. The analog front-end chip 132 is respectively connected to the second temperature sensor 131, the microprocessor 12, and the positive electrodes of the respective batteries 101 in the battery pack 10 through different pins. The voltages and currents corresponding to the respective batteries are obtained by the resistance sampling method through the connection with the respective batteries 101. The highest temperature collected by the second temperature sensor 131 is directly obtained through the connection with the second temperature sensor 131. And a second control signal for battery management is generated according to the respective voltages, the respective currents, the highest temperature, and the circuit protection evaluation criteria preset in the analog front-end chip 132. The output pin of the analog front-end chip 132 is connected to the input port of the microprocessor 12 through a wire, and is configured to transmit the obtained respective voltages, the respective currents, and the highest temperature to the microprocessor 12.

[0106] Further, the analog front-end chip 132 is specifically configured to:

[0107] If each current is less than a preset first current threshold and the highest temperature is less than a preset first temperature threshold, determine the generated pre-charge signal as the second control signal;

[0108] If each current is greater than or equal to the preset first current threshold and less than a preset second current threshold, and the highest temperature is less than the preset first temperature threshold, determine the generated main circuit switch closing signal as the second control signal;

[0109] If each current is greater than or equal to the preset second current threshold and less than a preset third current threshold, and the highest temperature is less than the preset first temperature threshold, determine the generated pre-discharge signal as the second control signal;

[0110] If any current is greater than or equal to a preset third current threshold, or the highest temperature is greater than or equal to a preset first temperature threshold, the generated main circuit switch-off signal is determined as the second control signal;

[0111] If the difference between any two voltages is greater than a preset voltage difference, the generated equalization enable signal is determined as the second control signal.

[0112] Specifically, if each current is less than a preset first current threshold and the highest temperature is less than a preset first temperature threshold, it can be considered that the power of some batteries in the current battery pack 10 is low and within the safe operating temperature range. The analog front-end chip 132 can generate a second control signal with the content of a pre-charge signal, enabling the battery pack 10 to enter the pre-charge state; if each current is greater than or equal to the preset first current threshold and less than a preset second current threshold, and the highest temperature is less than a preset first temperature threshold, it can be considered that the power of the current battery pack can support normal operation and is within the safe operating temperature range. At this time, the analog front-end chip 132 can generate a second control signal with the content of a main circuit switch-closure signal, enabling the battery pack 10 to operate normally; if each current is greater than or equal to the second preset current threshold and less than a preset third current threshold, and the highest temperature is less than a preset first temperature threshold, it can be considered that the power of some batteries in the current battery pack 10 is too high, which may affect the safety of the circuit operation, but has not reached the level of requiring immediate stop of operation, and the temperature of the current battery pack 10 is within the safe operating temperature range. At this time, the analog front-end chip 132 can generate a second control signal with the content of a pre-discharge signal, enabling the battery pack 10 to enter the pre-discharge state, so as to reduce the power of the battery pack 10 without affecting the normal operation of the circuit and reduce potential safety hazards; if any current is greater than or equal to a preset third current threshold, or the highest temperature is greater than or equal to a preset first temperature threshold, it can be considered that the current of one or more batteries 101 in the current battery pack 10 is too large, there may be an overcurrent or short-circuit fault, or the temperature of the current battery pack 10 has exceeded the safe operating temperature range, which has affected the safety of the circuit operation and the circuit cannot be continued to be connected for operation. At this time, the analog front-end chip 132 can generate a second control signal with the content of a main circuit switch-off signal, disconnecting the circuit and stopping the operation of the battery pack 10; if the voltage difference between any two batteries 101 in the battery pack 10 is greater than a preset voltage difference, it can be considered that the voltages of the batteries 101 in the battery pack 10 are unbalanced. At this time, the analog front-end chip 132 can generate a second control signal with the content of an equalization enable signal and send the second control signal to the battery pack equalization circuit 14 through the corresponding pin, so that the battery pack equalization circuit 14 equalizes the voltages of the batteries 101 in the battery pack 10.

[0113] Correspondingly, the microprocessor 12 is further configured to:

[0114] If all voltages are less than a preset first voltage threshold, all currents are less than a preset fourth current threshold, and the highest temperature is less than a preset second temperature threshold, determine the generated pre-charge signal as the third control signal;

[0115] If all voltages are greater than or equal to the preset first voltage threshold and less than the preset second voltage threshold, all currents are greater than or equal to the preset fourth current threshold and less than the preset fifth current threshold, and the highest temperature is less than the preset second temperature threshold, determine the generated main circuit switch closing signal as the third control signal;

[0116] If all voltages are greater than or equal to the preset second voltage threshold and less than the preset third voltage threshold, all currents are greater than or equal to the preset fifth current threshold and less than the preset sixth current threshold, and the highest temperature is less than the preset second temperature threshold, determine the generated pre-discharge signal as the third control signal;

[0117] If any voltage is greater than or equal to the preset third voltage threshold, any current is greater than or equal to the preset sixth current threshold, or the highest temperature is greater than the preset second temperature threshold, determine the generated main circuit switch opening signal as the third control signal;

[0118] Among them, the preset fourth current threshold is less than the preset first current threshold, the preset fifth current threshold is less than the preset second current threshold, the preset sixth current threshold is less than the preset third current threshold, and the preset second temperature threshold is less than the preset first temperature threshold.

[0119] Specifically, if each voltage is less than the preset first voltage threshold, each current is less than the preset fourth current threshold, and the highest temperature is less than the preset second temperature threshold, it can be considered that the power of some batteries in the current battery pack 10 is low and within the safe operating temperature range. At this time, the microprocessor 12 can generate a third control signal with the content of a pre-charging signal, enabling the battery pack 10 to enter the charging state; if each voltage is greater than or equal to the preset first voltage threshold and less than the preset second voltage threshold, each current is greater than or equal to the preset fourth current threshold and less than the preset fifth current threshold, and the highest temperature is less than the preset second temperature threshold, it can be considered that the voltage and current of each battery 101 in the current battery pack 10 can support the normal operation of the circuit, and the temperature of the entire battery pack 10 is within the safe operating temperature range. At this time, the microprocessor 12 can generate a third control signal with the content of a main circuit switch closing signal, enabling the battery pack 10 to operate normally; if each voltage is greater than or equal to the preset second voltage threshold and less than the preset third voltage threshold, each current is greater than or equal to the preset fifth current threshold and less than the preset sixth current threshold, and the highest temperature is less than the preset second temperature threshold, it can be considered that the power of some batteries in the current battery pack 10 is too high, or the voltage and current of some batteries are too high, which may affect the safety of the circuit operation, but has not reached the level that requires immediate stop of operation, and the temperature of the current battery pack 10 is within the safe operating temperature range. At this time, the microprocessor 12 can generate a third control signal with the content of a pre-discharging signal, enabling the battery pack 10 to enter the pre-discharging state, so as to reduce the power of the batteries 101 with high voltage and high current in the battery pack 10 without affecting the normal operation of the circuit and reduce potential safety hazards; if any voltage is greater than or equal to the preset third voltage threshold, any current is greater than or equal to the preset sixth current threshold, or the highest temperature is greater than the preset second temperature threshold, it can be considered that the current or voltage of one or more batteries 101 in the current battery pack 10 is too large, there may be an overcurrent or short-circuit fault, or the temperature of the current battery pack 10 has exceeded the safe operating temperature range, which has affected the safety of the circuit operation and the circuit cannot be continued to be connected for operation. At this time, the microprocessor 12 can generate a third control signal with the content of a main circuit switch opening signal, disconnecting the circuit and stopping the operation of the battery pack 10. Further, the preset fourth current threshold is less than the preset first current threshold, the preset fifth current threshold is less than the preset second current threshold, the preset sixth current threshold is less than the preset third current threshold, and the preset second temperature threshold is less than the preset first temperature threshold, indicating that the conditions for the microprocessor 12 to generate the same control signal are lower than those of the analog front-end chip 132. That is, the analog front-end chip 132 is mainly used for circuit protection, while the microprocessor 12 generates control signals according to actual requirements to achieve flexible management of the charging and discharging of the battery pack.

[0120] Exemplarily, Figure 6 FIG. is a circuit example diagram of a battery management system provided in Embodiment 2 of the present invention, as Figure 6The circuit shown is only an architectural example diagram of the battery management system of this application, not a specific schematic diagram. Some components are omitted, and the pin order is not exactly the same as that of the actual device. Among them, BAT+, BAT-, PACK+, PACK-, and RX / TX are the positive electrode of the battery pack, the negative electrode of the battery pack, the output positive electrode, the output negative electrode, and the communication port of the battery pack respectively; Q1 and Q2 are N MOS of the main circuit switch for battery management respectively, and Q3 and Q4 are P MOS switches in the pre-charge and discharge module for battery management respectively, which are used to control the pre-charge and pre-discharge of the battery pack; CELL1, CELL2... are the batteries connected in series in the battery pack respectively.

[0121] Continuing with the above example, U1 is a battery charge measurement chip, which is used to calculate the battery charge of the battery pack. This application takes the single-battery charge measurement chip BQ27Z561 as an example for illustration. U1 is connected to the battery pack through the first pin and receives the power supply of the battery pack; R1 and R2 are the voltage-dividing resistors of the battery pack, which are connected to the third pin and the seventh pin of U1 respectively, and are used to collect the voltage of the battery pack and calculate the charge of the battery pack as a whole; SENSE is a current detection resistor connected in series in the main circuit, and its two ends are connected to the fourth pin and the fifth pin of U1 respectively, and are used to collect the current of each battery in the battery pack; RT1 is a temperature sensor set at the theoretical average temperature in the battery pack and is connected to the fifth pin of U1, and is used to transfer the collected average temperature of the battery pack to U1; the second pin of U1 is connected to the second pin of the microprocessor U2 to realize the mutual communication between U1 and U2.

[0122] Continuing with the above example, U2 is a microprocessor, which is mainly used to generate control signals according to the received battery voltage, current, charge, and temperature information to control the functions and internal and external communications of the battery. Among them, the first pin of U2 is connected to the ninth pin of the analog front-end chip U3 to realize the mutual communication between U2 and U3; the second pin of U2 is connected to the second pin of U1 to realize the mutual communication between U1 and U2; the third pin of U2 is connected to the input ports of devices such as Q1, Q2, Q3, and Q4 to transfer other logic control information to the corresponding devices; the fourth pin of U2 is connected to the external communication port RX / TX for external communication; the fifth pin of U2 is the ground terminal; the sixth pin of U2 is connected to the battery pack to receive the power supply of the battery pack; the seventh pin of U2 is the reset pin and is connected to the reset chip U4 to receive the reset signal of U4 in case of a fault.

[0123] Continuing with the above example, U3 is an analog front-end chip used to detect the voltage and current of each cell in the battery pack, implement overcurrent and short-circuit protection for the battery pack, control pre-charge and pre-discharge MOS switches according to preset conditions, etc. In this application, the BQ76952 chip is used as an example for illustration. U3 is connected to the input ports of Q1, Q2, Q3, and Q4 through its first pin, second pin, fourteenth pin, and thirteenth pin respectively, for sending the generated control signals to the corresponding devices; the third pin, fourth pin, and fifth pin of U3 are connected to the sixth pin, fifth pin, and fourth pin of the balancing circuit U5 respectively, for receiving the voltage information of different cells in the battery pack and sending the generated balancing enable signal to U5 through the corresponding pins when needed; the sixth pin and seventh pin of U3 are connected to both ends of SENSE respectively, for collecting the current of each cell in the battery pack; the eighth pin of U3 is the ground terminal; the ninth pin of U3 is connected to the first pin of U2 for realizing the mutual communication between U2 and U3; the tenth pin of U3 is connected to the battery pack for receiving the power supply of the battery pack; the eleventh pin of U3 is connected to the sixth pin of U4 for realizing the mutual communication between U3 and U4; the twelfth pin of U3 is connected to the temperature sensor RT2 set at the theoretical highest temperature in the battery pack for obtaining the highest temperature of the battery pack.

[0124] Continuing with the above example, U4 is a reset chip used to reset U2 when the microprocessor U2 crashes due to the motor rotating erratically during the flight of the drone. The first pin of U4 is connected to the seventh pin of U2 for sending a reset signal to it when U2 fails; the second pin of U4 is used to receive the reset input signal of U2; the fifth pin of U4 is the ground terminal; the sixth pin of U4 is connected to the eleventh pin of U3 for realizing the mutual communication between U3 and U4.

[0125] Continuing with the above example, U5 is a balancing circuit used to collect the voltage of each cell in the battery pack and, when the battery pack is not working, solve the problem of inconsistent voltages of each cell in the battery pack caused by the large-current flight of the drone according to the received balancing enable signal. Among them, the first pin, second pin, and third pin of U5 are respectively connected to the positive electrodes of different cells in the battery pack; the fourth pin, fifth pin, and sixth pin of U5 are respectively connected to the fifth pin, fourth pin, and third pin of U3.

[0126] The battery management system provided by this embodiment, on the basis of the existing management method for a battery pack composed of multiple batteries, introduces a single-battery power measurement chip. Combining with the high-precision power measurement algorithm of the single-battery power measurement chip, it calculates the battery power of the battery pack as a whole. Furthermore, the microprocessor can generate a higher-precision control signal according to the high-precision battery power. By introducing a reset chip, the microprocessor can be reset and started in time when a fault occurs, achieving high-precision and high-safety management of the multi-battery battery pack, improving the flexibility of battery management, and reducing the complexity of microprocessor information processing.

[0127] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery management system, characterized in that, Comprising: A battery pack, a power measurement device, and a microprocessor; The power measurement device is respectively connected to the battery pack and the microprocessor, and is used to detect the voltage, current, and temperature information of the battery pack, determine the battery power of the battery pack, and transmit the battery power to the microprocessor; The microprocessor is used to generate a first control signal for battery management according to the battery power; The battery pack includes at least two series-connected batteries and is also connected to the microprocessor for supplying power to the power measurement device and the microprocessor; An analog front-end device; The analog front-end device is respectively connected to the battery pack and the microprocessor, and is used to detect the voltage and current of each battery in the battery pack and the highest temperature in the battery pack, generate a second control signal for battery management according to each voltage, each current, and the highest temperature, and transmit each voltage, each current, and the highest temperature to the microprocessor; The analog front-end device includes: a second temperature sensor and an analog front-end chip; The second temperature sensor is arranged at the theoretical highest temperature in the battery pack, and the output end of the second temperature sensor is connected to the pin of the analog front-end chip, and is used to collect the highest temperature in the battery pack and send the highest temperature to the analog front-end chip; the analog front-end chip is used to generate a second control signal for battery management according to the received highest temperature and the obtained voltage and current of each battery in the battery pack, and transmit each voltage, each current, and the highest temperature to the microprocessor; The analog front-end chip is specifically used for: If each current is less than a preset first current threshold and the highest temperature is less than a preset first temperature threshold, determining the generated pre-charge signal as the second control signal; If each current is greater than or equal to the preset first current threshold and less than a preset second current threshold, and the highest temperature is less than the preset first temperature threshold, determining the generated main circuit switch closing signal as the second control signal; If each current is greater than or equal to the preset second current threshold and less than a preset third current threshold, and the highest temperature is less than the preset first temperature threshold, determining the generated pre-discharge signal as the second control signal; If any one of the currents is greater than or equal to the preset third current threshold, or the highest temperature is greater than or equal to the preset first temperature threshold, determining the generated main circuit switch opening signal as the second control signal; If the difference between any two voltages is greater than a preset voltage difference, determining the generated equalization enable signal as the second control signal.

2. The system according to claim 1, wherein The power measurement device includes: a current and voltage sampling module, a first temperature sensor, and a power measurement chip; The current and voltage sampling module is connected to the pin of the power measurement chip, and is used to obtain the sampled voltage and sampled current of the battery pack, and send the sampled voltage and the sampled current to the power measurement chip; The first temperature sensor is disposed at the theoretical average temperature within the battery pack. The output end of the first temperature sensor is connected to a pin of the battery charge metering chip, and is configured to collect the average temperature within the battery pack and send the average temperature to the battery charge metering chip; The battery charge metering chip is respectively connected to the current and voltage sampling module, the first temperature sensor, and the microprocessor through different pins, and is configured to determine the battery charge of the battery pack according to the received sampling voltage, sampling current, and average temperature, and transfer the battery charge to the microprocessor; Wherein, the battery charge metering chip is a single-cell battery charge metering chip.

3. The system according to claim 2, wherein The current and voltage sampling module includes: A current detection resistor and a voltage dividing resistor, wherein: The voltage dividing resistor is connected in parallel across both ends of the battery pack and is configured to obtain the sampling voltage, which is the ratio of the output voltage of the battery pack to the number of batteries in the battery pack; The current detection resistor is directly connected in series in the main circuit and is connected in series with one end of the battery pack, and is configured to obtain the sampling current, which is the current flowing through the battery pack. The main circuit is a circuit formed by connecting the output positive electrode, the positive electrode of the battery pack, the negative electrode of the battery pack, and the output negative electrode.

4. The system according to claim 1, wherein The microprocessor is specifically configured to: If the battery charge is less than a preset first charge threshold, determine the generated pre-charging signal as the first control signal; If the battery charge is greater than or equal to the preset first charge threshold and less than a preset second charge threshold, determine the generated main circuit switch closing signal as the first control signal; If the battery charge is greater than or equal to the preset second charge threshold and less than a preset third charge threshold, determine the generated pre-discharging signal as the first control signal; If the battery charge is greater than or equal to the preset third charge threshold, determine the generated main circuit switch opening signal as the first control signal.

5. The system according to claim 1, wherein It further includes: The microprocessor is configured to generate a third control signal for battery management according to each of the voltages, each of the currents, and the highest temperature.

6. The system according to claim 1, wherein The analog front-end chip is respectively connected to the second temperature sensor, the microprocessor, and the positive terminals of each battery in the battery pack through different pins.

7. The system according to claim 5, wherein The microprocessor is further configured to: If each of the voltages is less than a preset first voltage threshold, each of the currents is less than a preset fourth current threshold, and the highest temperature is less than a preset second temperature threshold, determine the generated pre-charging signal as the third control signal; If each of the voltages is greater than or equal to the preset first voltage threshold and less than a preset second voltage threshold, each of the currents is greater than or equal to the preset fourth current threshold and less than a preset fifth current threshold, and the highest temperature is less than a preset second temperature threshold, determine the generated main circuit switch closing signal as the third control signal; If each of the voltages is greater than or equal to the preset second voltage threshold and less than the preset third voltage threshold, each of the currents is greater than or equal to the preset fifth current threshold and less than the preset sixth current threshold, and the highest temperature is less than the preset second temperature threshold, the generated pre-discharge signal is determined as the third control signal; If any one of the voltages is greater than or equal to the preset third voltage threshold, any one of the currents is greater than or equal to the preset sixth current threshold, or the highest temperature is greater than the preset second temperature threshold, the generated main circuit switch-off signal is determined as the third control signal; Among them, the preset fourth current threshold is less than the preset first current threshold, the preset fifth current threshold is less than the preset second current threshold, the preset sixth current threshold is less than the preset third current threshold, and the preset second temperature threshold is less than the preset first temperature threshold.

8. The system according to claim 1, characterized in that, It further includes: Battery pack equalization circuit; The battery pack equalization circuit is connected to the analog front-end device and is respectively connected to each battery in the battery pack, and is used to perform voltage equalization on each battery when receiving the second control signal which is the equalization enable signal sent by the analog front-end device.

9. The system according to claim 1, wherein It further includes: Reset chip; The reset chip is connected to the reset pin of the microprocessor and is used to send a reset signal to the reset pin when detecting a microprocessor fault, so that the reset pin is at a low level to reset the microprocessor.

10. The system according to any one of claims 1-9, characterized in that, It further includes: Main circuit switch and pre-charge and discharge module; The main circuit switch is directly connected in series to the main circuit and is respectively connected to the microprocessor and the analog front-end device, and is used to close when receiving the main circuit switch closure signal to connect the main circuit, and to open when receiving the main circuit switch-off signal to disconnect the main circuit; The pre-charge and discharge module is directly connected in series to the main circuit, is connected in parallel with the main circuit switch, and is respectively connected to the microprocessor and the analog front-end device, and is used to close the pre-charge switch when receiving the pre-charge signal to pre-charge the battery pack, and to close the pre-discharge switch when receiving the pre-discharge signal to pre-discharge the battery pack; Among them, the main circuit switch closure signal, the main circuit switch-off signal, the pre-charge signal and the pre-discharge signal are the first control signal and the third control signal from the microprocessor, and the second control signal from the analog front-end device.

Images