Main control system for energy storage battery management

Abstract

The invention provides a master control system for energy storage battery management. The master control system comprises a main processor, and a high-voltage detection circuit, a driving control circuit and an input detection circuit which are electrically connected with the main processor. The high-voltage detection circuit comprises a total voltage detection circuit and an insulation detection circuit, and the insulation detection circuit adopts an unbalanced bridge method and can detect insulation resistance; the total voltage detection circuit divides the input total voltage through a resistor and then converts the total voltage through a digital-to-analog converter, and the main processor and the digital-to-analog converter perform information interaction through an isolation chip to obtain a conversion value; the driving control circuit comprises a high-side driving chip, a channel is selected based on an IS pin of the high-side driving chip, current is output, and the main processor monitors the state of the monitoring equipment in real time by detecting the voltage of the IS pin; and the input detection circuit comprises multiple paths of digital and analog input detection circuits and is used for performing dual detection and proofreading on detection data. The system is rich in function and high in adaptability, and can be used for energy storage systems under various use conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage batteries, and in particular to a main control system for managing energy storage batteries. Technical Background

[0002] With the development of energy storage, lithium-ion battery systems are widely used in the field of energy storage, among which lithium-ion liquid-cooled battery packs are gradually becoming mainstream products in the market. Lithium-ion liquid-cooled battery packs in the energy storage field require high-precision detection data from the main control board of the corresponding battery management system, high product reliability, long life, and low cost. The existing technology lacks a main control system with high compatibility, high reliability, and high sampling accuracy suitable for commercial applications. Summary of the invention

[0003] In response to the above problems, the present invention provides a main control system for energy storage battery management, which is rich in functions and highly adaptable. It can meet the requirements of high compatibility, high reliability and high sampling accuracy of main control board products and can be used for energy storage systems under various operating conditions.

[0004] A main control system for energy storage battery management comprises a main processor and a high-voltage detection circuit, a drive control circuit and an input detection circuit electrically connected thereto. The high-voltage detection circuit comprises a total voltage detection circuit and an insulation detection circuit. The insulation detection circuit adopts an unbalanced bridge method and can detect insulation resistance. The total voltage detection circuit divides the input total voltage through a resistor and then converts it through a digital-to-analog converter. The main processor and the digital-to-analog converter exchange information through an isolation chip to obtain a conversion value. The drive control circuit comprises a high-side drive chip. The channel is selected and the current is output based on the IS pin of the high-side drive chip. The main processor monitors the working state of the monitoring device in real time by detecting the voltage of the IS pin. The input detection circuit comprises a multi-channel digital input detection circuit and an analog input detection circuit, and double detection and proofreading are performed on the detection data.

[0005] Preferably, in the insulation detection circuit, the upper and lower bridge arms of the unbalanced bridge and three sampling points in the bridge arms are connected to a control switch, the control switch is connected to the casing, fixed value resistors are connected to the casing and the positive and negative ends of the battery pack, and the main processor obtains the insulation resistance value by comparing the sampling values ​​before and after the control switch.

[0006] Preferably, in the total voltage detection circuit, the acceptable voltage value after voltage division is connected to the inductor beads and the common-mode inductor for noise reduction and filtering, and then connected to the digital-to-analog converter for digital-to-analog conversion.

[0007] As a preferred embodiment, in the drive control circuit, the configuration logic of the IS pin selection channel is as follows: the first, second, and third selection switches are respectively set between the IS pin and the DEN pin, the DSEL1 pin, and the DSEL0 pin; when DEN=1, the first selection switch sets a channel; when DSEL1=0, the second selection switch sets a channel; when DSEL0=0, the third selection switch sets a channel; one channel of the third selection switch is connected to channel 0, and the second channel of the third selection switch is connected to channel 1; when one channel of the first, second, and third selection switches is connected, that is, DEN=1, DSEL1=0, and DSEL0=0 are satisfied at the same time, the IS pin is connected to channel 0, and the output I IS0 When the first and second selection switches are connected to the second channel of the third selection switch, that is, DEN = 1, DSEL1 = 0, DSEL0 = 1, the IS pin is connected to channel 1, and the output is I IS1 ; Set the fourth selection switch between the second channel of the second selection switch, DSEL0 and DSEL1 pins. When DSEL0=0, the fourth selection switch sets the first channel, and the first channel is connected to the channel 2. When DSEL0=1, the fourth selection switch sets the second channel, and the second channel is connected to the channel 3. That is, when DEN=1, DSEL1=1, and DSEL0=0 are satisfied at the same time, the IS pin is connected to the channel 2, and the output I IS2 , when DEN=1、DSEL1=1、DSEL0=1, IS pin is connected to channel 3, output I IS3 .

[0008] Preferably, two FAULT switches are set, FAULT is a double-ended normally open switch, the first FAULT switch connects channel 0, channel 1 and channel FAULT, and the second FAULT switch connects channel FAULT, channel 2 and channel 3. When a fault occurs in the driving foot, the FAULT switch automatically closes.

[0009] Preferably, in the input detection circuit, a TVS is provided at the port to suppress high-voltage spike signals, and a ceramic capacitor and a magnetic bead are provided at the port to form an LC filter circuit, one end of the ceramic capacitor is connected to the input DI, and the other end is grounded, one end of the magnetic bead is connected to the ceramic capacitor, and the other end serves as the output end of the LC filter circuit; in the digital input detection circuit, the output end of the LC filter circuit is connected to a resistor and a diode and then connected to a 24V power supply, and the output end of the LC filter circuit is also connected to a MOS tube to achieve level conversion, a voltage regulator tube is provided between the gate and source of the MOS tube to stabilize the Vgs voltage of the MOS tube, and the drain of the MOS tube is connected to the digital signal input end of the main processor; in the analog input detection circuit, the output end of the LC filter circuit is connected to a temperature-variable resistor and then connected to a 3.3V power supply, and the output end of the LC filter circuit is also connected to the analog signal input end of the main processor.

[0010] Preferably, the feedback pin is detected based on a digital input detection circuit, the feedback pin is connected to the input terminal DI, the switch is closed and short-circuited to GND, and the voltage is measured to be 0V, or the switch is closed and short-circuited to 24V, and the working state of the feedback pin is judged by the change of the switch; the temperature is detected based on an analog input detection circuit, and when the circuit is connected, the voltage divider value of the temperature-variable resistor is collected, and the corresponding temperature value can be obtained by looking up the resistance-temperature table.

[0011] Preferably, the main control system also includes a low-voltage power supply protection circuit, and a varistor and a TVS are provided at the port of the protection circuit to suppress abnormal overvoltage.

[0012] Preferably, the main control system also includes a communication interface circuit, including a CAN bus circuit, an RS485 bus circuit and an Ethernet bus circuit. The communication circuit adopts isolated communication, and the main control board and the slave control communicate through the CAN bus circuit.

[0013] Preferably, the CAN interface chip uses NXP's TJA1042T / 3. The CAN interface chip interacts with the main processor through a dual-channel isolation chip, and several TVSs are designed at the interface for multiple protections.

[0014] Beneficial Effects

[0015] Compared with the main control system of general energy storage battery management, the beneficial effects of the present invention are:

[0016] (1) The main control system disclosed in the present invention is a battery management system main control integration solution dedicated to industrial and commercial energy storage, which meets the functional requirements of industrial and commercial energy storage systems and the requirements of high compatibility, long life, high reliability and high sampling accuracy of main control board products;

[0017] (2) In view of the complex and harsh operating conditions of the energy storage system, the main control system disclosed in the present invention enhances the protection and anti-interference capabilities of the interface circuit of the main control; it is designed with multi-channel temperature monitoring, voltage monitoring and current monitoring, etc., which can monitor the working status of various components of the energy storage system, such as low-voltage power supply, fuse and relay. The dual monitoring can improve the reliability of monitoring sampling data, thereby ensuring the reliability and safety of the system;

[0018] (3) The sampling functions of total voltage sampling, insulation sampling and current detection in the main control system disclosed by the present invention are highly accurate. The total voltage sampling can achieve a detection accuracy of 0.5% over the full temperature range and full voltage range, the insulation detection accuracy can achieve a detection accuracy of 15%, and the current detection accuracy is 0.5%;

[0019] (4) The drive control circuit design of the main control system disclosed in the present invention has an intelligent diagnosis function, which can monitor the working current and working status of the drive circuit in real time. The processor can identify various drive circuit faults such as output short circuit to ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a main control architecture of an embodiment of the present invention;

[0021] Figure 2 is a CAN bus circuit diagram of an embodiment of the present invention;

[0022] Figure 3 is an insulation detection circuit diagram of an embodiment of the present invention;

[0023] Figure 4 is a total pressure detection circuit diagram of an embodiment of the present invention;

[0024] Figure 5 is a high side driving circuit diagram of an embodiment of the present invention;

[0025] Figure 6 is a diagram of the IS pin configuration of one embodiment of the present invention;

[0026] Figure 7 is a low-side driving circuit diagram of an embodiment of the present invention;

[0027] Figure 8 is a dry node driving circuit diagram of an embodiment of the present invention;

[0028] Fig. 9 is a digital input detection circuit diagram of an embodiment of the present invention;

[0029] Fig.10 is an analog input detection circuit diagram of an embodiment of the present invention;

[0030] Fig.11 This is a schematic diagram of a main control board PCB according to an embodiment of the present invention;

[0031] Fig.12 The invention discloses a low-voltage power supply protection circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present application, it should be understood that the terms "center", "upper", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple people" and "several" mean two or more.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] The present invention discloses a battery management system master control integration solution dedicated to industrial and commercial energy storage, which meets the functional requirements of industrial and commercial energy storage systems and the requirements of high compatibility, long life, high reliability and high sampling accuracy of main control board products.

[0036] like Figure 1 As shown, a main control system for energy storage battery management includes a main processor and a power supply circuit, a communication interface circuit, a high-voltage detection circuit, a drive control circuit and an input detection circuit electrically connected thereto. In this embodiment, the main processor is ST's STM32MP157AAC3. Figure 1 The red arrow indicates the direction of high current, and the black arrow indicates the direction of signal. Figure 1 The EN pin is connected to the 24V to 12V module and the 12V to 5V module. This port is connected to an external power supply module to power the entire circuit board. Figure 1 The CAN transceiver, CAN controller, and 485 transceiver module are used to realize the communication between the main control board and the slave control. Figure 1 The total voltage detection module and insulation detection module are used to collect the positive and negative voltages and insulation resistance of the battery pack. Figure 1The drive and detection circuit module monitors the working state of the drive load and the drive current in real time for energy storage systems under different working conditions. Figure 1 The analog input detection module, digital input detection module and dry contact input detection module are used to detect fuses, relays, circuit breakers and low-voltage power supplies. The main control system of the present invention is comprehensively designed to meet the functional requirements of industrial and commercial energy storage systems and the requirements of high compatibility, long life, high reliability and high sampling accuracy of the main control board products.

[0037] The communication interface circuit includes CAN bus circuit, RS485 bus circuit and Ethernet bus circuit. It has rich communication interfaces and high adaptability. In addition, considering the harsh actual use environment, the multi-channel communication circuit adopts isolated communication, and the main control board and the slave control communicate through the CAN bus to ensure the reliability and stability of communication. Figure 2 As shown in the figure, the CAN interface chip uses NXP's TJA1042T / 3. The CAN0 signals EXT_CAN0_H, EXT_CAN0_RES, and EXT_CAN0_L of the slave control board are connected to the CAN_H and CAN_L pins of the CAN interface chip through TVS12, TVS8, TVS9, and TVS45. Multiple protections are implemented based on TVS12, TVS8, TVS9, and TVS45, which effectively improve the anti-interference ability of the bus and ensure the reliability and stability of the product. The RXD and TXD pins of the CAN interface chip are connected to a dual-channel isolation chip (TI's ISO7721QDRQ1) to interact with the main processor. Specifically, the OUTA and INB pins of the isolation chip are connected to the MCU_CAN0_RX and MCU_CAN0_TX pins of the main control chip.

[0038] High voltage detection circuit, including two total voltage detection circuits and one insulation detection circuit:

[0039] Insulation detection circuit, such as Figure 3As shown, the unbalanced bridge method is adopted, and the insulation resistance can be accurately detected within a wide input voltage range of 50-1600V, and the sampled value is uploaded to the main processor through a four-channel isolation chip. The main processor calculates the insulation resistance value based on the uploaded data. Specifically, the insulation detection circuit adopts the unbalanced bridge method, one end of the upper bridge arm is connected to the positive electrode of the battery, and one end of the lower bridge arm is connected to the negative electrode of the battery. Three sampling points (DOWN_SW, MID_SW, UP_SW) are taken, namely, the other end of the upper and lower bridge arms and the control switch is connected in the bridge arm, and the control switch is connected to the casing. Preferably, the control switch uses an optical coupler QCPL-A58JV-500E. By controlling the connection of a fixed value resistor between pe (casing) and b+ and b- (positive and negative ends of the battery pack), the insulation resistance value can be obtained by comparing and calculating the sampled values ​​before and after the switch. At the same time, the input voltage Volt_Meas3 is connected to the BLM18PG471 inductor bead to suppress high-frequency noise in power line applications, which is used to reduce the possibility of resonance to provide an undistorted signal waveform. Then, the common-mode interference signal is filtered through the common-mode inductor to obtain Volt_Meas3+ / -. The Volt_Meas3+ / - signal is connected to the analog input port AIN pin of the digital-to-analog converter for digital-to-analog conversion, and then connected to the main processor through the four-channel isolation chip. The main processor and the four-channel isolation chip exchange information to obtain the conversion value of the digital-to-analog converter to protect the safety of the system. Among them, the digital-to-analog converter uses ADS1118IDGSR, and the four-channel isolation chip uses ISO7741DWR. Its INA, INB, INC, and OUTD pins are connected to the corresponding pins of the main processor to achieve isolation between high voltage and low voltage.

[0040] Total voltage detection circuit, such as Figure 4 As shown, the maximum detectable total voltage is 0-1600V, and the detection of high-precision full temperature and full voltage can achieve a detection accuracy of 0.5%. First, the total voltage VIN1+ and VIN2+ are divided by resistors to obtain acceptable voltage values ​​Volt_Meas1 and Volt_Meas2. Volt_Meas1 and Volt_Meas2 pass through inductor beads (BLM18PG471) to suppress high-frequency noise and reduce resonance in power line applications, and filter common-mode interference signals through common-mode inductors to obtain Volt_Meas1+ / - and Volt_Meas2+ / -.

[0041] Volt_Meas1+ / -, Volt_Meas2+ / - are converted by the digital-to-analog converter. The digital-to-analog converter uses ADS1118IDGSR. The pins of Volt_Meas1+ / - and Volt_Meas2+ / - are connected to the analog input port AIN of the digital-to-analog converter chip for digital-to-analog conversion, and then connected to the main processor through a four-channel isolation chip. The four-channel isolation chip uses ISO7741DWR, and its INA, INB, INC, and OUTD pins are connected to the corresponding pins of the main processor to achieve isolation between high voltage and low voltage. The main processor exchanges information with the four-channel isolation chip to obtain the conversion value of the digital-to-analog converter to protect the safety of the system.

[0042] The drive control circuit includes multiple high-side drivers, low-side drivers and dry node driver circuits with intelligent diagnosis. The drive circuit has a variety of driving capabilities to choose from, which can be adapted to energy storage systems with different operating conditions. The main processor can monitor the working status of the controlled equipment in real time.

[0043] High-side driver circuits such as Figure 5 As shown in the figure, U32 is a four-channel high-side driver chip (BTT6200-4EMA from Infineon), PIN24 is OUT0, PIN20 is OUT1, PIN 17 is OUT2, and PIN 13 is OUT3, corresponding to four channels. The four-channel ports are connected to the external HSD connector through the TVS diode, and the TVS uses SMBJ36 as a protection device. PIN7 is the IS pin, PIN6 is the DEN pin, and PIN8 and PIN11 are the DSEL0 and DSEL1 pins. The main processor can press the DEN, DSEL1, and DSEL0 pins. Figure 6 The configuration selection channel is performed to realize the output current of the IS pin which is proportionally reduced with the corresponding selection channel. At the same time, when the driving pin encounters a corresponding fault, the main processor can also identify the fault through the IS pin and upload it. Specifically, a first selection switch is set between the IS pin and the DEN pin. When DEN=1, the first selection switch sets a channel;

[0044] A second selection switch is set between the IS pin and the DSEL1 pin. When DSEL1=0, the second selection switch sets a channel.

[0045] A third selection switch is set between the IS pin and DSEL0. When DSEL0=0, the third selection switch sets a channel. One channel of the third selection switch is connected to channel 0, and the second channel of the third selection switch is connected to channel 1.

[0046] The first, second, and third selection switches are connected to one channel, that is, when DEN = 1, DSEL1 = 0, and DSEL0 = 0 are satisfied at the same time, the IS pin is connected to channel 0, and the output I IS0When the first and second selection switches of the first and second channels and the second channel of the third selection switch are connected, that is, when DEN = 1, DSEL1 = 0, and DSEL0 = 1 at the same time, the IS pin is connected to channel 1 and the output I IS .

[0047] A fourth selection switch is set between the DSEL0 and DSEL1 pins, and the fourth selection switch is connected to the second channel of the second selection switch. When the fourth selection switch is set to one channel (DSEL0=0), it is connected to channel 2, and when the fourth selection switch is set to two channels (DSEL0=1), it is connected to channel 3.

[0048] The first channel of the first selection switch, the second channel of the second selection switch, the first channel of the fourth selection switch and channel 2 are connected, that is, when DEN=1, DSEL1=1, DSEL0=0 are satisfied at the same time, the IS pin is connected to channel 2 and the output I IS2 .

[0049] The first channel of the first selection switch, the second channel of the second selection switch, the second channel of the fourth selection switch and channel 3 are connected, that is, when DEN = 1, DSEL1 = 1, and DSEL0 = 1 are satisfied at the same time, the IS pin is connected to channel 3 and the output I IS3 .

[0050] The FAULT switch is a normally open double-ended switch. Two FAULT switches are set. The first FAULT switch connects channel 0, channel 1, and channel FAULT. The second FAULT switch connects channel FAULT, channel 2, and channel 3. When the driving foot encounters a corresponding fault, FAULT automatically closes. At this time, the fault current is large in value and can cover the current of any channel. That is, no matter which channel the IS foot is connected to, it can identify a large current. At this time, the fault can be identified by reading the current size of the IS foot.

[0051] Since the main processor collects voltage values ​​or voltage drops, a proportional resistor is set at the IS pin. The current of the IS pin is judged by comparing the state switching during the action process to achieve real-time monitoring of the working state of the drive load and the drive current. At the same time, the data uploaded by the IS pin is processed to obtain the working state of the corresponding drive pin, and corresponding actions are taken such as disconnecting the drive, uploading faults, etc. to protect the safe, stable and normal operation of the system.

[0052] Low-side driver circuits such as Figure 7As shown, M34 is a single-channel low-side driver chip. In this embodiment, ON's NCV8406ASTT3G is used. PIN2 and PIN4 are output ports, and the output ports are connected to external connectors through protection devices such as TVS diodes and ESD capacitors C212. Among them, TVS uses SMBJ36 as a protection device. PIN1 of M34 is a control pin. The main processor controls the driver chip M34 through an RC filter circuit composed of a resistor R312 and a capacitor C208. The low-side output port is fed back to the main processor through an RC filter circuit composed of a resistor R324 and a capacitor C209. The main processor judges the working state of the drive circuit by the detection result of the feedback pin before and after the switch. The presence of the voltage regulator Z28 can protect the sampling port of the main processor from being damaged by overvoltage.

[0053] Dry junction drive circuit, such as Figure 8 As shown, HF's HFD4 / 5-SR is used, and the main processor controls the switch of K3 through M37. Diode D57 performs freewheeling to suppress the voltage across the DS of M37 when the switch tube M37 is turned off.

[0054] Input detection circuit, including multiple digital input and analog input detection circuit. Figures 9 and 10As shown, the input detection circuit is provided with TVS26 and TVS31 at the analog input port AI and the digital input port DI, respectively, which can effectively suppress high-voltage spike signals to protect internal devices and prevent overvoltage from damaging subsequent devices. In the digital input detection circuit, the ceramic capacitor C176 and the magnetic bead FB22 form an LC filter circuit, which can filter out some high-frequency interference signals and prevent the circuit from working abnormally due to high-frequency interference signals. The LC filter circuit connects the MOS tube M19 to realize level conversion, converting the 24V level to a 3.3V level acceptable to the main processor, and also plays a certain isolation role to protect the subsequent main processor. The voltage regulator Z19 is connected between the gate source of M19 to stabilize the Vgs voltage of M19 and prevent overvoltage from damaging M19. The drain of M19 is connected to the digital signal input terminal of the main processor. In the analog input detection circuit, ceramic capacitor C185 and magnetic bead FB26 form an LC filter circuit, which can filter out some high-frequency interference signals and prevent the circuit from working abnormally due to high-frequency interference signals. The output end of the LC filter circuit is connected to resistors R255 and R258. The output end of resistor R258 is connected to resistor R263 and then grounded. Capacitor C188 and voltage regulator Z30 are connected in parallel at both ends of resistor R263. Voltage regulator Z30 stabilizes the voltage at both ends of capacitor C188 to prevent overvoltage from damaging the main processor. The output end of resistor R258 is also connected to the analog signal input end of the main processor. The LC filter circuit is connected to the analog signal input end of the main processor. In the energy storage system, the input detection circuit is used to detect components such as fuses, relays, circuit breakers, and low-voltage power supplies. The operating temperature of these components can be monitored to determine the working status of the components. At the same time, the feedback pins of some components and the output voltage of the low-voltage power supply can also be monitored. The feedback pin is detected by the digital input detection circuit. The feedback pin is equivalent to the switch quantity, such as Fig. 9 As shown, connect the switch quantity to the input terminal DI6, close the switch and short-circuit to GND, and measure the voltage 0V, or close the switch and short-circuit to 24V, and judge the working state of the feedback foot by the change of the switch. Detect the temperature through the analog input detection circuit, such as Fig.10 As shown, the LC filter circuit input section AI1 is connected to a variable resistor (thermistor) that changes with temperature, and then the voltage is divided by the LC filter circuit and R255, and the divided voltage is divided twice by resistors R258 and R263. The main processor can convert the resistance value of the external thermistor by detecting the voltage value of resistor R263, and the corresponding temperature value can be obtained by looking up the resistance-temperature table of the temperature-variable resistor. By realizing dual monitoring and calibration of the operating temperature and feedback pin of the peripheral components, the reliability of the detection data is increased, and corresponding actions such as alarms can be taken in time for abnormal working conditions of the components such as abnormal temperature.

[0055] like Fig.11As shown in the figure, it is the PCB of the main control board that integrates the above circuits. On the one hand, in order to meet the design requirements of high-precision sampling, the main control board has selected relevant sampling circuits according to higher precision requirements. At the same time, considering the cost, corresponding low-cost detection solutions are reserved. Each module circuit has a margin to adapt to energy storage systems with different requirements. On the other hand, for important components of the energy storage system, such as fuses, the main control board will not only monitor its own temperature in real time through the analog input detection circuit, but also monitor its feedback pin through the digital input detection circuit. At the same time, its detection circuit is also designed with a corresponding LC filter circuit to filter out interference. The main processor judges the working status of the component based on the sampled data, and then performs corresponding operations based on the detection results to ensure that the component works safely and reliably. At the same time, dual monitoring can improve the reliability of monitoring sampling data, thereby ensuring the reliability and safety of the system.

[0056] Considering the working conditions of the energy storage system, corresponding protection devices such as TVS are added to each external pin. Fig.12 The protection circuit of the power supply circuit shown in the figure is to connect the fuse JFC2410 at the port.

[0057] 2100, and the port is equipped with varistor R4 and TVS1 for protection to suppress abnormal overvoltage in the circuit, to avoid overvoltage damage to the subsequent components and cause abnormal circuit operation. At the same time, the combination of varistor R4 and TVS1 can improve the protection ability of the protection circuit. Schottky diode SS15U60PQ is also provided for reverse protection, which plays a protective role. At the same time, the power port is also designed with corresponding differential common mode filter circuits, such as Fig.12 L1, L4 and corresponding filter capacitors C73, C74, C114 form a filter to filter out the corresponding high-frequency interference. EXT is connected to an external 24V voltage, outputs 24V-OUT to power the drive circuit, outputs 24V-BAT to power the network, outputs 24V-DI to power the digital circuit, and outputs 24V for subsequent conversion to 5V and 3.3V to power the internal logic chip.

[0058] This application designs a battery management system master control integration solution dedicated to industrial and commercial energy storage to meet the functional requirements of industrial and commercial energy storage systems. In view of the actual situation of complex use environment and strong interference of energy storage, each interface of the main control board has corresponding protection, and multiple protections are designed for some interfaces to ensure the reliability of the product and strong anti-interference ability; at the same time, dual monitoring is designed for each major component of the energy storage system to ensure the stable and safe operation of the system, and the corresponding drive circuits are designed with intelligent diagnosis. At the same time, this system can achieve high-precision and low-error sampling of higher total battery pack voltage, charge and discharge current, insulation resistance, and is stable and reliable; the main control board needs to be able to collect 0-1600V single cell voltage, accuracy: 0.5% (within the full voltage range). Temperature range -40℃-125℃, accuracy 1℃, error 1℃. Current sampling accuracy: 0.5%. Insulation detection accuracy: 15%, meeting the requirements of high compatibility, long life, high reliability and high sampling accuracy of the main control board products.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A main control system for energy storage battery management, characterized in that: It includes a main processor and a high-voltage detection circuit, a drive control circuit and an input detection circuit electrically connected thereto. The high-voltage detection circuit includes a total voltage detection circuit and an insulation detection circuit. The insulation detection circuit adopts an unbalanced bridge method and can detect insulation resistance. The total voltage detection circuit divides the input total voltage through a resistor and then converts it through a digital-to-analog converter. The main processor and the digital-to-analog converter exchange information through an isolation chip to obtain a conversion value. The drive control circuit includes a high-side driver chip, which selects a channel and outputs a current based on the IS pin of the high-side driver chip. The main processor monitors the working status of the monitoring device in real time by detecting the voltage of the IS pin. The input detection circuit includes a multi-channel digital input detection circuit and an analog input detection circuit, and performs double detection and correction on the detection data.

2. The main control system according to claim 1, characterized in that: In the insulation detection circuit, the upper and lower bridge arms of the unbalanced bridge and three sampling points in the bridge arm are connected to a control switch, the control switch is connected to the housing, and fixed value resistors are connected to the housing and the positive and negative ends of the battery pack. The main processor obtains the insulation resistance value by comparing the sampling values ​​before and after the control switch.

3. The main control system according to claim 1, characterized in that: In the total voltage detection circuit, the acceptable voltage value after voltage division is connected to the inductor beads and the common mode inductor for noise reduction and filtering, and then connected to the digital-to-analog converter for digital-to-analog conversion.

4. The main control system according to any one of claims 1 to 3, characterized in that: In the drive control circuit, the high-side driver chip uses BTT6200-4EMA, PIN7 is the IS pin, and PIN6 is the DEN pin. The configuration logic of the IS pin selection channel is as follows: the first, second, and third selection switches are set between the IS pin and the DEN pin, the DSEL1 pin, and the DSEL0 pin, respectively. When DEN=1, the first selection switch sets a channel, when DSEL1=0, the second selection switch sets a channel, and when DSEL0=0, the third selection switch sets a channel; one channel of the third selection switch is connected to channel 0, and the second channel of the third selection switch is connected to channel 1. When one channel of the first, second, and third selection switches is connected, that is, DEN=1, DSEL1=0, and DSEL0=0 are satisfied at the same time, the IS pin is connected to channel 0, and the output I IS0 When the first and second selection switches are connected to the second channel of the third selection switch, that is, DEN = 1, DSEL1 = 0, DSEL0 = 1, the IS pin is connected to channel 1, and the output is I IS1 ; A fourth selection switch is set between the second channel of the second selection switch, DSEL0 and DSEL1 pins. When DSEL0=0, the fourth selection switch sets channel 1, which is connected to channel 2. When DSEL0=1, the fourth selection switch sets channel 2, which is connected to channel 3. That is, when DEN=1, DSEL1=1, and DSEL0=0 are satisfied at the same time, the IS pin is connected to channel 2, and the output I IS2 , while satisfying When DEN=1、DSEL1=1、DSEL0=1, IS pin is connected to channel 3, output I IS3 .

5. The main control system according to claim 4, characterized in that: Set up two FAULT switches, FAULT is a double-ended normally open switch. The first FAULT switch connects channel 0, channel 1, and channel FAULT, the second FAULT switch connects channel FAULT, channel 2, and channel 3. When a fault occurs on the drive foot, the FAULT switch automatically closes.

6. The main control system according to claim 1, characterized in that: In the input detection circuit, a TVS is provided at the port to suppress high-voltage spike signals, and a ceramic capacitor and a magnetic bead are provided at the port to form an LC filter circuit, one end of the ceramic capacitor is connected to the input DI, and the other end is grounded, one end of the magnetic bead is connected to the ceramic capacitor, and the other end serves as the output end of the LC filter circuit; in the digital input detection circuit, the output end of the LC filter circuit is connected to a resistor and a diode and then connected to a 24V power supply, and the output end of the LC filter circuit is also connected to a MOS tube to achieve level conversion, a voltage regulator tube is provided between the gate and source of the MOS tube to stabilize the Vgs voltage of the MOS tube, and the drain of the MOS tube is connected to the digital signal input end of the main processor; in the analog input detection circuit, resistor R255 and resistor R258 are connected through the output end of the LC filter circuit, and the output end of the resistor R258 is connected to resistor R263 and the analog signal input end of the main processor.

7. The main control system according to claim 1, characterized in that: The feedback pin is detected based on the digital input detection circuit. The feedback pin is connected to the input terminal DI, the switch is closed and short-circuited to GND, and the voltage is measured to be 0V, or the switch is closed and short-circuited to 24V. The working state of the feedback pin is judged by the change of the switch; the temperature is detected based on the analog input detection circuit. A variable resistor that changes with temperature is connected to the input end of the LC filter circuit. The voltage divider value of the variable resistor that changes with temperature is collected, and the corresponding temperature value can be obtained by looking up the resistance-temperature table.

8. The main control system according to claim 1, characterized in that: The main control system also includes a low-voltage power supply protection circuit, and a varistor and a TVS are provided at the port of the protection circuit to suppress abnormal overvoltage.

9. The main control system according to claim 1, characterized in that: The main control system also includes a communication interface circuit, including a CAN bus circuit, an RS485 bus circuit and an Ethernet bus circuit. The communication circuit adopts isolated communication, and the main control board and the slave control communicate through the CAN bus circuit.

10. The main control system according to claim 9, characterized in that: The CAN interface chip uses NXP's TJA1042T / 3. The CAN interface chip interacts with the main processor through a dual-channel isolation chip, and several TVS are designed at the interface for multiple protections.

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