阅读说明：本技术 一种无人机锂电池单电池智能管理电路及mcu控制器 (Unmanned aerial vehicle lithium cell intelligent management circuit and MCU controller ) 是由 张明君 彭彦平 张万宁 于 2021-07-26 设计创作，主要内容包括：本发明公开了一种无人机锂电池单电池智能管理电路及MCU控制器,包括：用于检测单体电池电压信号的电池检测单元；用于控制单体电池至负载电路路径开断的开关机按键控制单元；用于控制单体电池的泄压支路A开断的过压平衡管理单元；用于控制单体电池的泄压支路B开断的电芯平衡管理单元；还包括：MCU控制器：所述MCU控制器用于接收电池检测单元采集的单体电池电压信号、开关机按键控制单元的按键信号；所述MCU控制器还用于根据接收的电压信号、按键信号判断电池的状态并发出相应的控制指令。MCU控制单元承担着数据集中分析处理的作用,通过控制平衡管理单元来控制单体电池泄压路径的开关。本系统结构相对简单,可适用于各种类型的无人机中使用。(The invention discloses an unmanned aerial vehicle lithium battery cell intelligent management circuit and an MCU controller, comprising: the battery detection unit is used for detecting voltage signals of the single batteries; the startup and shutdown key control unit is used for controlling the single battery to be disconnected with the load circuit path; the overvoltage balance management unit is used for controlling the on-off of the pressure relief branch A of the single battery; the battery cell balance management unit is used for controlling the voltage relief branch B of the single battery to be disconnected; further comprising: the MCU controller: the MCU controller is used for receiving the single battery voltage signal acquired by the battery detection unit and the key signal of the power-on and power-off key control unit; and the MCU controller is also used for judging the state of the battery according to the received voltage signal and the key signal and sending a corresponding control instruction. The MCU control unit plays a role in analyzing and processing data in a centralized mode and controls the switch of the single battery pressure relief path through controlling the balance management unit. This system structure is simple relatively, uses in applicable unmanned aerial vehicle of all kinds.)

1. The utility model provides an unmanned aerial vehicle lithium cell intelligent management circuit which characterized in that includes:

the battery detection unit is used for detecting voltage signals of the single batteries;

the startup and shutdown key control unit is used for controlling the single battery to be disconnected with the load circuit path;

the overvoltage balance management unit is used for controlling the on-off of the pressure relief branch A of the single battery;

the battery cell balance management unit is used for controlling the voltage relief branch B of the single battery to be disconnected;

further comprising: the MCU controller: the MCU controller is used for receiving the single battery voltage signals acquired by the battery detection unit and the key signals acquired by the startup and shutdown key control unit;

the MCU controller is used for judging that the single battery is in a charging state when the voltage signal of the single battery is in a continuously rising state, and sending a first control instruction to the overvoltage balance management unit when the single battery is in the charging state and the voltage signal of the single battery exceeds a first threshold value; after receiving the first control instruction, the overvoltage balance management unit controls a pressure relief branch A of the single battery to open;

the MCU controller is used for judging that the single battery is in a standing state when the key signal is in an off state, and sending a second control instruction to the battery cell balance management unit when the single battery is in the standing state and the voltage signal of the single battery exceeds a second threshold value; after receiving the second control instruction, the cell balance management unit controls the pressure relief branch B of the single battery to be opened;

the MCU controller is used for judging that the single battery is in a load power supply state when the key signal is in an on state, and sending a third control instruction to the power on/off key control unit when the single battery is in the load power supply state; and after receiving the third control instruction, the power on/off key control unit controls the single battery to be conducted to the load circuit path.

2. The intelligent management circuit for the lithium battery cells of the unmanned aerial vehicle as claimed in claim 1, the overvoltage balance management unit is a dual-channel gate drive control circuit, the dual-channel gate drive control circuit comprises an upper arm bridge MOS tube Q2, a lower arm bridge MOS tube Q3 and a gate driver which are connected in a half-bridge structure, the grid electrode of the upper arm bridge MOS tube Q2 is connected to the output pin of a high side driver of the gate driver through a resistor R13, the drain electrode of Q2 is connected with a power supply voltage, the source electrode of Q2 is connected with a load, the grid electrode of the lower arm bridge MOS tube Q3 is connected to the output pin of the low side driver of the gate driver through a resistor R17, the drain electrode of Q3 is connected with the load, the source electrode of Q3 is grounded, the high-side logic input and the low-side logic input of the grid driver are respectively connected with the MCU controller, the device is used for receiving a second control instruction, and the second control instruction is a dual-channel complementary control instruction.

3. The intelligent management circuit for the unmanned aerial vehicle lithium battery cells as claimed in claim 1, wherein the cell balance management unit is a discharge control circuit, the discharge control circuit is a switch circuit composed of a P-MOS transistor and an N-MOS transistor, a gate of the N-MOS transistor is connected to the second control command, a drain of the N-MOS transistor is connected to a gate of the P-MOS transistor, a source of the N-MOS transistor is grounded, a source and a drain of the P-MOS transistor are respectively connected to an anode and a cathode of the single battery, a resistor R20 is further connected between the drain of the N-MOS transistor and the source of the P-MOS transistor, and the drain of the P-MOS transistor is further connected to ground through a discharge resistor.

4. The intelligent management circuit for the lithium battery cells of the unmanned aerial vehicle as claimed in claim 2, wherein the gate driver is a UCC27712 chip for driving switches of power devices Q2 and Q3, a pin HB of the UCC27712 chip is bypassed to HS through a capacitor to maintain the operation of the bootstrap circuit, a pin COM is grounded, a pin VDD is connected to a voltage of 12V, and the pin is bypassed to COM through C10 and C11.

5. The intelligent management circuit for the lithium battery cells of the unmanned aerial vehicle as claimed in claim 4, wherein the MCU controller is further hung with an OLED display module, receives the voltage signals of the single batteries collected by the battery detection unit and transmits the voltage signals to the OLED display module for real-time display through SPI communication, and the battery detection unit adopts an ISL78600 chip.

6. The intelligent management circuit for the lithium battery cells of the unmanned aerial vehicle as claimed in claim 5, wherein the MCU controller is further loaded with a coulometer sampling unit, and the coulometer sampling unit is connected in series with a sampling resistor R connected in series between a battery module formed by the serial connection of the single batteries and a switch-on/off key control unit_senseAnd connecting, acquiring a voltage signal of the battery module and outputting the voltage signal of the battery module to an MCU (microprogrammed control Unit) controller through IIC (inter-integrated Circuit) communication, wherein the MCU controller is used for receiving the voltage signal of the battery module of the coulometer sampling unit, outputting the cycle number of the battery module and the actual electric quantity of the battery module and judging the actual electric quantity of the battery module according to an algorithm for adjusting the cycle number of the battery module through a preset voltage signal, when the MCU controller judges that the current cycle number is greater than the preset cycle number, the MCU controller sends a fourth control instruction to a startup and shutdown key control unit, and after the startup and shutdown key control unit receives the fourth control instruction, the single battery is controlled to be shut down to a load circuit path.

7. The intelligent management circuit for the lithium battery cells of the unmanned aerial vehicle as claimed in claim 6, wherein the MCU controller is further hung with an OLED display module, the MCU controller transmits the cycle number of the battery module and the actual electric quantity of the battery module to the OLED display module through SPI communication for real-time display, when the MCU controller judges that the current cycle number is equal to the preset cycle number, the MCU controller displays alarm information through the OLED display module, and the electric quantity coulometer sampling unit adopts an LTC2944 chip to collect the voltage signal of the battery module.

8. The intelligent management circuit for the lithium battery cells of the unmanned aerial vehicle as claimed in claim 7, wherein the MCU controller is further connected with a temperature acquisition unit, the MCU controller is used for receiving a battery module temperature signal of the temperature acquisition unit and sending the battery module temperature signal to the OLED display module for real-time display through SPI communication, and the temperature acquisition unit is a temperature sensor arranged in a battery module formed by the sequential serial connection of the single batteries, an NTC thermistor circuit connected with an ISL78600 chip temperature input pin, or a temperature sensor arranged in an LTC2944 chip.

9. The intelligent management circuit for the lithium battery cells of the unmanned aerial vehicle as claimed in claim 1, further comprising a power management module, wherein the power management module realizes 12V stable voltage source output by adopting a TPS54360b chip, and the power management module realizes 3.3V stable voltage source output by adopting an MIC5219-33 chip.

10. An MCU controller, comprising:

one or more memories for storing the data to be transmitted,

one or more processors for executing a program to perform,

a plurality of modules stored in the memory and executed by the processor, the modules comprising:

a voltage receiving module: the single battery voltage signal is used for receiving the single battery voltage signal collected by the battery detection unit;

the key signal receiving module: the key signal is used for receiving the key control unit of the on-off switch;

a determination module:

the overvoltage balance management unit is used for judging that the single battery is in a charging state when the voltage signal of the single battery is in a continuously rising state, and sending a first control instruction to the overvoltage balance management unit when the single battery is in the charging state and the voltage signal of the single battery exceeds a first threshold value;

the battery cell balance management unit is used for judging that the single battery cell is in a standing state when the key signal is in a turn-off state, and sending a second control instruction to the battery cell balance management unit when the single battery cell is in the standing state and the voltage signal of the single battery cell exceeds a second threshold value;

and when the single battery is in the load power supply state, a third control instruction is sent to the on-off key control unit.

Technical Field

The invention relates to the field of battery management, in particular to an unmanned aerial vehicle lithium battery cell intelligent management circuit and an MCU controller.

Background

A Battery Management System (BMS) refers to how power is efficiently distributed to the various components of the system. Power management is critical for mobile devices that rely on battery power. By reducing the energy consumption of the components when idle, an excellent power management system can extend battery life by a factor of two or three. The battery pack for the unmanned aerial vehicle is generally formed by connecting batteries in series so as to meet the voltage and power requirements of the power supply of the electric vehicle. The differences in the manufacturing process, heat dissipation conditions and aging degree during use of the battery can lead to inconsistent performance of the battery, and thus to unbalanced voltage of the battery pack connected in series. In order to ensure the use safety of the series battery pack and prolong the service life of the series battery pack, the information such as the voltage, the current, the temperature and the like of each battery needs to be detected and monitored in real time, and the batteries need to be balanced when the voltages of the batteries are unbalanced, so that the overcharging, overdischarging and overtemperature of the batteries are prevented. The intelligent management of the battery in the unmanned aerial vehicle industry is always in an immature stage, and the intelligent management of the battery is carried out by using a charger. At present, the battery management system is characterized in that the intelligent management of single batteries is carried out in the Xinjiang province, and partial intelligent management units are arranged at battery ends, but the maintenance and the maintenance of the whole battery must be combined with an intelligent charger equipped in the battery management system. The single bare cell scheme basically adopted by the existing unmanned aerial vehicle manufacturer is mostly managed through a single cell balance path, the real situation of the battery energy cannot be objectively reflected, the difference of the capacity among the single cells is not substantially improved, and the available capacity of the battery pack cannot be effectively improved.

Disclosure of Invention

The invention aims to provide an unmanned aerial vehicle lithium battery cell intelligent management circuit and an MCU controller, wherein the MCU controller controls double pressure relief paths of an overvoltage balance management unit and a battery cell balance management unit to realize battery management of a single battery charging state and a single battery standing state through judging two states of the battery, so that the problem that the existing battery management can only perform single-path battery charging and discharging process management by judging the SOC value of the single battery is solved.

An unmanned aerial vehicle lithium cell intelligent management circuit includes:

the battery detection unit is used for detecting voltage signals of the single batteries;

the startup and shutdown key control unit is used for controlling the single battery to be disconnected with the load circuit path;

the overvoltage balance management unit is used for controlling the on-off of the pressure relief branch A of the single battery;

the battery cell balance management unit is used for controlling the voltage relief branch B of the single battery to be disconnected;

further comprising: the MCU controller: the MCU controller is used for receiving the single battery voltage signals acquired by the battery detection unit and the key signals acquired by the startup and shutdown key control unit;

the MCU controller is used for judging that the single battery is in a charging state when the voltage signal of the single battery is in a continuously rising state, and sending a first control instruction to the overvoltage balance management unit when the single battery is in the charging state and the voltage signal of the single battery exceeds a first threshold value; after receiving the first control instruction, the overvoltage balance management unit controls a pressure relief branch A of the single battery to open;

the MCU controller is used for judging that the single battery is in a standing state when the key signal is in an off state, and sending a second control instruction to the battery cell balance management unit when the single battery is in the standing state and the voltage signal of the single battery exceeds a second threshold value; after receiving the second control instruction, the cell balance management unit controls the pressure relief branch B of the single battery to be opened;

the MCU controller is used for judging that the single battery is in a load power supply state when the key signal is in an on state, and sending a third control instruction to the power on/off key control unit when the single battery is in the load power supply state; and after receiving the third control instruction, the power on/off key control unit controls the single battery to be conducted to the load circuit path.

In the existing battery balance management, most of the controllers judge the single batteries needing to be balanced according to the SOC values of the single batteries, and send switch control instructions to the switch driver, and the switch driver controls the switch unit according to the switch control instructions so as to realize the balancing operation of the single batteries needing to be balanced. The battery balancing scheme ignores the judgment of the working state of the battery, the battery balancing based on a single path cannot objectively reflect the real situation of the energy of the battery, the difference of the capacity among the single batteries is not substantially improved, and the available capacity of the battery pack cannot be effectively improved.

The intelligent battery management system of the unmanned aerial vehicle, provided by the invention, performs double logic control by judging the charging state and the standing state of the single battery, so that the management of double pressure relief paths (including a pressure relief branch A of an overvoltage balance management unit and a pressure relief branch B of a battery cell balance management unit) is realized. Judging whether the battery is in a charging state, and analyzing and comparing the received voltage signal with the stored voltage signals received for a plurality of times before by the MCU controller, thereby effectively determining the charging state of the battery and avoiding state misjudgment caused by the abnormity of the single battery; whether the battery is in the standing state or not is judged, and the MCU controller analyzes and judges the received key signals, so that the influence of abnormal voltage signals is reduced, and the standing state of the battery is effectively determined. The MCU controller carries out effective maintenance on the single battery through accurate double-state judgment and double-path control.

The overvoltage balance management unit is a dual-channel gate drive control circuit, the dual-channel gate drive control circuit comprises an upper arm bridge MOS tube Q2, a lower arm bridge MOS tube Q3 and a gate driver which are connected in a half-bridge structure, the grid electrode of the upper arm bridge MOS tube Q2 is connected to the high-side driver output pin of the gate driver through a resistor R13, the drain electrode of the Q2 is connected with a power supply voltage, the source electrode of the Q2 is connected with a load, the grid electrode of the lower arm bridge MOS tube Q3 is connected to the low-side driver output pin of the gate driver through a resistor R17, the drain electrode of the Q3 is connected with the load, the source electrode of the Q3 is grounded, the high-side logic input and the low-side logic input of the gate driver are respectively connected with an MCU controller and used for receiving a second control instruction, the second control instruction is a dual-channel complementary control instruction, and the Q2 and the Q3 cannot be conducted at the same time.

The battery cell balance management unit is a discharge control circuit, the discharge control circuit is a switch circuit composed of a P-MOS tube and an N-MOS tube, the grid electrode of the N-MOS tube is connected with a second control instruction, the drain electrode of the N-MOS tube is connected with the grid electrode of the P-MOS tube, the source electrode of the N-MOS tube is grounded, the source electrode and the drain electrode of the P-MOS tube are respectively connected with the anode and the cathode of the single battery, a resistor R20 is further connected between the drain electrode of the N-MOS tube and the source electrode of the P-MOS tube, and the drain electrode of the P-MOS tube is further connected with the ground through a discharge resistor.

The gate driver is a UCC27712 chip and is used for driving switches of power devices Q2 and Q3, a pin HB of the UCC27712 chip is bypassed to HS through a capacitor to maintain the operation of the bootstrap circuit, a pin COM is grounded, a pin VDD is connected to 12V voltage, and the pin COM is bypassed to COM through C10 and C11.

The MCU controller is also hung with an OLED display module, receives the single battery voltage signal collected by the battery detection unit and sends the single battery voltage signal to the OLED display module through SPI communication for real-time display, and the battery detection unit adopts an ISL78600 chip.

The MCU controller is also hung with an electric quantity coulometer sampling unit, and the electric quantity coulometer sampling unit is connected with a sampling resistor R which is connected in series between a battery module and a power-on and power-off key control unit, wherein the battery module is formed by sequentially connecting the single batteries in series_senseAnd connecting, acquiring a voltage signal of the battery module and outputting the voltage signal of the battery module to an MCU (microprogrammed control Unit) controller through IIC (inter-integrated Circuit) communication, wherein the MCU controller is used for receiving the voltage signal of the battery module of the coulometer sampling unit, outputting the cycle number of the battery module and the actual electric quantity of the battery module and judging the actual electric quantity of the battery module according to an algorithm for adjusting the cycle number of the battery module through a preset voltage signal, when the MCU controller judges that the current cycle number is greater than the preset cycle number, the MCU controller sends a fourth control instruction to a startup and shutdown key control unit, and after the startup and shutdown key control unit receives the fourth control instruction, the single battery is controlled to be shut down to a load circuit path.

The MCU controller is also hung with an OLED display module, the MCU controller transmits the cycle number of the battery module and the actual electric quantity of the battery module to the OLED display module through SPI communication for real-time display, when the MCU controller judges that the current cycle number is equal to the preset cycle number, the MCU controller displays alarm information through the OLED display module, and the electric quantity coulometer sampling unit adopts an LTC2944 chip to collect a voltage signal of the battery module.

The MCU controller is also connected with a temperature acquisition unit, the MCU controller is used for receiving a battery module temperature signal of the temperature acquisition unit and sending the battery module temperature signal to the OLED display module through SPI communication for real-time display, the temperature acquisition unit is a temperature sensor arranged in a battery module formed by the sequential serial connection of the single batteries, an NTC thermistor circuit connected with an ISL78600 chip temperature input pin or a temperature sensor arranged in an LTC2944 chip.

The unmanned aerial vehicle lithium battery cell intelligent management circuit further comprises a power supply management module, wherein the power supply management module adopts a TPS54360b chip to realize 12V stable voltage source output, and the power supply management module adopts an MIC5219-33 chip to realize 3.3V stable voltage source output.

An MCU controller, comprising:

one or more memories for storing the data to be transmitted,

one or more processors for executing a program to perform,

a plurality of modules stored in the memory and executed by the processor, the modules comprising:

a voltage receiving module: the single battery voltage signal is used for receiving the single battery voltage signal collected by the battery detection unit;

the key signal receiving module: the key signal is used for receiving the key control unit of the on-off switch;

a determination module:

the overvoltage balance management unit is used for judging that the single battery is in a charging state when the voltage signal of the single battery is in a continuously rising state, and sending a first control instruction to the overvoltage balance management unit when the single battery is in the charging state and the voltage signal of the single battery exceeds a first threshold value;

the battery cell balance management unit is used for judging that the single battery cell is in a standing state when the key signal is in a turn-off state, and sending a second control instruction to the battery cell balance management unit when the single battery cell is in the standing state and the voltage signal of the single battery cell exceeds a second threshold value;

and when the single battery is in the load power supply state, a third control instruction is sent to the on-off key control unit.

The power management module is used for carrying out DC-DC voltage reduction and isolation on the battery voltage and respectively outputting stable working voltage to the OLED display module, the MCU controller, the overvoltage balance management unit and the battery cell balance management unit.

When the voltage of a certain single battery exceeds a set threshold value, the MCU control unit starts the discharge control circuit, outputs a control signal through the logic gate circuit to drive the corresponding MOS tube to be conducted, so that the voltage of the battery is maintained within the range of the set threshold value, and the overcharge of the battery is prevented.

The number of the batteries is not more than 12 and not less than 2, the batteries are single lithium batteries, and the batteries are connected in series to form a battery module. The number of the dual-channel grid electrode driving control circuits is matched with the number of the single batteries.

Furthermore, the MCU control unit is also provided with a UART/CAN communication interface for data interaction with other communication equipment.

The power supply and the shutoff of load circuit are realized to the on-off button control unit, and MCU control unit controls MOS pipe drive circuit in the on-off button control unit to switch on and shut off through detecting the button signal, and MOS pipe drive circuit switches on, and the intercommunication load circuit supplies power, and MOS pipe drive circuit cuts off, cuts off the load circuit and stops supplying power.

The invention has the following beneficial effects:

1. and intelligently managing and controlling the charging state, the discharging state and the standing state of the battery through the MCU controller. When the single batteries are in the charging process and the voltage signals exceed the first threshold value, the discharge balance is carried out through the overvoltage balance management unit so as to meet the requirement that the voltages of the whole battery cell group are kept consistent. When the single battery is in the standing state and the voltage signal exceeds the second threshold value, the voltage is reduced through the battery cell balance management unit, and battery bulge caused by long-time storage is avoided. And when the load power supply state is judged, the power supply to the load circuit is realized through the on-off key control unit.

2. The battery module is collected in real time through a coulometer collection unit, and an IIC communication interface is adopted to perform data interaction with an MCU controller so as to participate in information interaction between an intelligent management system and a battery state;

3. and the battery state in the long-term storage or use process is monitored in real time, wherein the battery state comprises battery internal resistance, battery electric quantity and battery voltage. The system is convenient and portable, provides possibility for field unmanned aerial vehicle endurance, has simple and reasonable integral structure and strong operating universality, and can realize the management of the rechargeable battery of the unmanned aerial vehicle, thereby solving the problem of battery management of the battery cell in the unmanned aerial vehicle independent of a charger, and being beneficial to saving energy to achieve the aim of long-time flight; moreover, the system is relatively simple in structure and applicable to various types of unmanned aerial vehicles.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a flowchart illustrating a process of issuing a first control command according to the present invention;

FIG. 3 is a flowchart illustrating a second control command issue according to the present invention;

FIG. 4 is a flowchart illustrating a third exemplary embodiment of the present invention;

FIG. 5 is a schematic diagram of a coulometer sampling cell according to the present invention;

FIG. 6 is a schematic structural diagram of a power-on/off key control unit according to the present invention;

FIG. 7 is a schematic diagram of a MOSFET driving circuit of the overvoltage balancing management unit of the present invention;

fig. 8 is a schematic structural diagram of a cell balance management unit according to the present invention;

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, or that are conventionally placed when the product of the present invention is used, and are used only for convenience in describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "open," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

The utility model provides an unmanned aerial vehicle lithium cell intelligent management circuit which characterized in that includes:

the battery detection unit is used for detecting voltage signals of the single batteries;

the startup and shutdown key control unit is used for controlling the single battery to be disconnected with the load circuit path;

the overvoltage balance management unit is used for controlling the on-off of the pressure relief branch A of the single battery;

the battery cell balance management unit is used for controlling the voltage relief branch B of the single battery to be disconnected;

further comprising: the MCU controller: the MCU controller is used for receiving the single battery voltage signals acquired by the battery detection unit and the key signals acquired by the startup and shutdown key control unit;

the MCU controller is used for judging that the single battery is in a charging state when the voltage signal of the single battery is in a continuously rising state, and sending a first control instruction to the overvoltage balance management unit when the single battery is in the charging state and the voltage signal of the single battery exceeds a first threshold value; after receiving the first control instruction, the overvoltage balance management unit controls a pressure relief branch A of the single battery to open;

the MCU controller is used for judging that the single battery is in a standing state when the key signal is in an off state, and sending a second control instruction to the battery cell balance management unit when the single battery is in the standing state and the voltage signal of the single battery exceeds a second threshold value; after receiving the second control instruction, the cell balance management unit controls the pressure relief branch B of the single battery to be opened;

the MCU controller is used for judging that the single battery is in a load power supply state when the key signal is in an on state, and sending a third control instruction to the power on/off key control unit when the single battery is in the load power supply state; and after receiving the third control instruction, the power on/off key control unit controls the single battery to be conducted to the load circuit path.

The overvoltage balance management unit is a dual-channel gate drive control circuit, the dual-channel gate drive control circuit comprises an upper arm bridge MOS tube Q2, a lower arm bridge MOS tube Q3 and a gate driver which are connected in a half-bridge structure, the grid electrode of the upper arm bridge MOS tube Q2 is connected to the high-side driver output pin of the gate driver through a resistor R13, the drain electrode of the Q2 is connected with a power supply voltage, the source electrode of the Q2 is connected with a load, the grid electrode of the lower arm bridge MOS tube Q3 is connected to the low-side driver output pin of the gate driver through a resistor R17, the drain electrode of the Q3 is connected with the load, the source electrode of the Q3 is grounded, the high-side logic input and the low-side logic input of the gate driver are respectively connected with an MCU controller and used for receiving a second control instruction, the second control instruction is a dual-channel complementary control instruction, and the Q2 and the Q3 cannot be conducted at the same time.

The battery cell balance management unit is a discharge control circuit, the discharge control circuit is a switch circuit composed of a P-MOS tube and an N-MOS tube, the grid electrode of the N-MOS tube is connected with a second control instruction, the drain electrode of the N-MOS tube is connected with the grid electrode of the P-MOS tube, the source electrode of the N-MOS tube is grounded, the source electrode and the drain electrode of the P-MOS tube are respectively connected with the anode and the cathode of the single battery, a resistor R20 is further connected between the drain electrode of the N-MOS tube and the source electrode of the P-MOS tube, and the drain electrode of the P-MOS tube is further connected with the ground through a discharge resistor.

The gate driver is a UCC27712 chip and is used for driving switches of power devices Q2 and Q3, a pin HB of the UCC27712 chip is bypassed to HS through a capacitor to maintain the operation of the bootstrap circuit, a pin COM is grounded, a pin VDD is connected to 12V voltage, and the pin COM is bypassed to COM through C10 and C11.

The MCU controller is also hung with an OLED display module, receives the single battery voltage signal collected by the battery detection unit and sends the single battery voltage signal to the OLED display module through SPI communication for real-time display, and the battery detection unit adopts an ISL78600 chip.

The MCU controller is also hung with an electric quantity coulometer sampling unit, and the electric quantity coulometer sampling unit is connected with a sampling resistor R which is connected in series between a battery module and a power-on and power-off key control unit, wherein the battery module is formed by sequentially connecting the single batteries in series_senseAnd connecting, acquiring a voltage signal of the battery module and outputting the voltage signal of the battery module to an MCU (microprogrammed control Unit) controller through IIC (inter-integrated Circuit) communication, wherein the MCU controller is used for receiving the voltage signal of the battery module of the coulometer sampling unit, outputting the cycle number of the battery module and the actual electric quantity of the battery module and judging the actual electric quantity of the battery module according to an algorithm for adjusting the cycle number of the battery module through a preset voltage signal, when the MCU controller judges that the current cycle number is greater than the preset cycle number, the MCU controller sends a fourth control instruction to a startup and shutdown key control unit, and after the startup and shutdown key control unit receives the fourth control instruction, the single battery is controlled to be shut down to a load circuit path.

The MCU controller is also hung with an OLED display module, the MCU controller transmits the cycle number of the battery module and the actual electric quantity of the battery module to the OLED display module through SPI communication for real-time display, when the MCU controller judges that the current cycle number is equal to the preset cycle number, the MCU controller displays alarm information through the OLED display module, and the electric quantity coulometer sampling unit adopts an LTC2944 chip to collect a voltage signal of the battery module.

The MCU controller is also connected with a temperature acquisition unit, the MCU controller is used for receiving a battery module temperature signal of the temperature acquisition unit and sending the battery module temperature signal to the OLED display module through SPI communication for real-time display, the temperature acquisition unit is arranged in the temperature sensor inside the battery module formed by the sequential serial connection of the single batteries, and an NTC thermistor circuit or an LTC2944 chip built-in temperature sensor connected with an ISL78600 chip temperature input pin.

An MCU controller, comprising:

one or more memories for storing the data to be transmitted,

one or more processors for executing a program to perform,

a plurality of modules stored in the memory and executed by the processor, the modules comprising:

a voltage receiving module: the single battery voltage signal is used for receiving the single battery voltage signal collected by the battery detection unit;

the key signal receiving module: the key signal is used for receiving the key control unit of the on-off switch;

a determination module:

the overvoltage balance management unit is used for judging that the single battery is in a charging state when the voltage signal of the single battery is in a continuously rising state, and sending a first control instruction to the overvoltage balance management unit when the single battery is in the charging state and the voltage signal of the single battery exceeds a first threshold value;

the battery cell balance management unit is used for judging that the single battery cell is in a standing state when the key signal is in a turn-off state, and sending a second control instruction to the battery cell balance management unit when the single battery cell is in the standing state and the voltage signal of the single battery cell exceeds a second threshold value;

and when the single battery is in the load power supply state, a third control instruction is sent to the on-off key control unit.

The power management module is used for carrying out DC-DC voltage reduction and isolation on the battery voltage and respectively outputting stable working voltage to the OLED display module, the MCU control unit and the balance management unit.

When the voltage of a certain single battery exceeds a set threshold value, the MCU control unit starts the discharge control circuit, outputs a control signal through the logic gate circuit to drive the corresponding MOS tube to be conducted, so that the voltage of the battery is maintained within the range of the set threshold value, and the overcharge of the battery is prevented.

The number of the batteries is not more than 12 and not less than 2, the batteries are single lithium batteries, and the batteries are connected in series to form a battery module. The number of the dual-channel grid electrode driving control circuits is matched with the number of the single batteries.

Furthermore, the MCU control unit is also provided with a UART/CAN communication interface for data interaction with other communication equipment.

The power supply and the shutoff of load circuit are realized to the on-off button control unit, and MCU control unit controls MOS pipe drive circuit in the on-off button control unit to switch on and shut off through detecting the button signal, and MOS pipe drive circuit switches on, and the intercommunication load circuit supplies power, and MOS pipe drive circuit cuts off, cuts off the load circuit and stops supplying power.

Specifically, the coulometer sampling unit adopts an LTC2944 chip to sample a battery voltage signal, and realizes the calculation of the charge amount through an automatic zero-return differential analog integrator built in the chip. qLSB refers to the minimum unit of charge that can be measured, i.e., the amount of charge represented by the lowest bit of the 16-bit register (i.e., resolution), and thus the maximum charge that can be measuredCell capacity 65535 q_LSB. I.e. q_LSBThe value of (d) is calculated by sampling the resistance and the pre-division coefficient M, i.e.:

wherein R is_senseFor the sampling resistance value of the LTC2944 chip connection, M is a programmable prescaler coefficient. The chip is mainly used for selecting a sampling resistor and a pre-frequency division coefficient, and the MCU controller needs to read data of an internal register through an IIC bus.

The MCU controller carries out parameter configuration to the LTC2944 chip control register through the IIC to trigger the conversion of voltage, current and temperature working modes, and through setting the chip under the temperature mode, the temperature sensor built in the LTC2944 chip collects the temperature signal of the battery module and sends the temperature signal to the MCU controller.

Specifically, the battery monitoring module adopts ISL78600 chip to acquire cell voltage and temperature data, the MCU controller controls the balance through the form of sending a command to ISL78600, the unit measurement accuracy of ISL78600 is +/-1.5 mV, total pressure measurement accuracy is +/-100 mV, 12-way balance control circuit is provided, 12-string cell voltage scanning can be realized once in 234 microseconds, 2Mbps SPI communication is supported simultaneously, electrical isolation is realized between ISL78600 and the MCU controller, and SPI communication is adopted.

The electric quantity passing through the sampling resistor is recorded by the electric quantity coulometer sampling unit, whether the battery belongs to a discharging state or a charging state is judged according to the current direction passing through the sampling resistor, the accumulated electric quantity passing through the sampling resistor is calculated and compared with the preset battery electric quantity, and when the discharging quantity and the error percentage of the sampling resistor plus the charging quantity and the error percentage of the sampling resistor are sampled to be 2 and the preset battery electric quantity is recorded, one cycle number is recorded. Theoretically: the error percentage and the preset battery capacity belong to dynamic numerical values, the dynamic numerical values are fitted into a function according to a service life curve given by a battery manufacturer, and the battery capacity and the error percentage numerical values at different stages are calculated through the fitted function. When the recorded actual use cycle number is equal to the preset cycle number, the MCU controller gives alarm information through the OLED display module to prompt a user to pay attention to the use of the battery, and the phenomenon that the explosion machine is caused due to the fact that the battery is used excessively is avoided. When the actual cycle number exceeds the preset cycle number, the MCU controller does not start the MOS tube array powered by the battery to the outside any more.

By employing the UCC27712 chip as a gate driver for driving the power device MOSFETs, the UCC27712 chip is used as a gate driver between the PWM output of the MCU controller and the gate of the power semiconductor device in order to achieve fast switching of the power device and reduce associated switching power losses. The prior art has the problem that the PWM signal output by the MCU controller can not directly drive the MOS tube, because the PWM signal from the MCU controller is usually a 3.3V logic signal, the power switch can not be effectively turned on. To avoid this problem, the drone uses a digital power supply, and a UCC27712 chip gate driver to boost the 3.3V signal to the gate drive voltage (e.g., 12V) to turn the power device on completely and minimize conduction losses.

When the battery module enters a charging terminal or a standing state, the MCU control unit sets the voltage of all the single batteries as the threshold voltage and detects the voltage value of each single battery, and when the voltage value of each single battery is larger than the threshold voltage, the MCU control unit sends a PWM control signal to the battery cell balance management unit, so that the battery voltage is discharged through the balance discharge resistor, and the voltage is maintained within the set threshold range.

Specifically, unmanned aerial vehicle lithium cell intelligent management circuit still includes power management module, power management module adopts the TPS54360b chip for realize the step-down and the isolation to the battery module, obtains stable 12V voltage source through the TPS54360b chip, and stable 3.3V voltage source and high peak current are exported through MIC5219-33 chip to the 12V voltage source, provide stable power for OLED display module, MCU controller, overvoltage balance management and electric core balance management unit.

The utility model provides an unmanned aerial vehicle lithium cell intelligent management circuit's purpose is the normal work of going on of every battery cell safety in guaranteeing the battery module to can more storage or discharge the electric quantity on the basis of normal work. Therefore, the design of the lithium battery management system must effectively measure and analyze the voltage and temperature of each battery and the SOC of the whole battery pack, and take corresponding operations according to the analysis result. The MCU control unit plays a role in centralized data analysis and processing, whether the balancing is performed or not is determined through data analysis, and the balancing of the single batteries is controlled through controlling the balance management unit.

The foregoing is only a preferred embodiment of the present invention, and the present invention is not limited thereto in any way, and any simple modification, equivalent replacement and improvement made to the above embodiment within the spirit and principle of the present invention still fall within the protection scope of the present invention.