Voltage inspection instrument and voltage inspection system suitable for high-voltage series stack

Abstract

The utility model discloses a voltage inspection instrument and a voltage inspection system suitable for a high-voltage series stack, relates to the technical field of energy storage batteries, and aims to solve the problems that the current stack voltage inspection instrument has few channels, non-synchronous measurement, large volume, difficulty in stack detection, low voltage resistance and low insulation, and is not suitable for a multi-stack series and high-voltage system. The device comprises an upper casing, a lower casing, a ventilation valve and a PCBA (Printed Circuit Board Assembly), and the PCBA comprises an isolation power supply circuit for supplying power to an internal circuit, a central processing circuit, an isolation 485 communication circuit, an isolation CAN (Controller Area Network) communication circuit, a high-voltage SPI (Serial Peripheral Interface) isolation communication circuit, an analog acquisition circuit, an electric connector interface I and an electric connector interface II. According to the voltage inspection instrument and system, multi-channel synchronous measurement is realized by virtue of special circuit design, small size and portability are realized by virtue of a specific structure, multi-pile series connection and high voltage resistance insulation are supported, and the voltage inspection level is improved in an omnibearing manner.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage battery technical field more specifically, relate to a voltage inspection appearance and voltage inspection system suitable for high voltage series connection electric pile. BACKGROUND

[0002] In practical application, because monolithic cell output voltage is lower, to meet the load demand, often dozens even hundreds of monolithic cell series connection into electric pile use. However, monolithic cell's performance and health condition is vital to the stability and safety of the whole electric pile, once monolithic cell fails, can lead to the whole electric pile collapse, cause serious economic loss, even endanger the personal and equipment safety.

[0003] At present, the voltage inspection appearance applied to electric pile has many problems. On the one hand, the channel number of most voltage inspection appearance single pile is less, adopts the non-synchronous measurement method of time division multiplexing, is difficult to meet the demand of multiple cell simultaneous monitoring, on the other hand, these inspection appearance volume is huge, is cumbersome, is inconvenient to use in the electric pile detection occasion. In addition, the existing voltage inspection appearance mostly can only carry out single pile detection, and the voltage insulation grade is lower, cannot support the application occasion of multiple pile series connection, up to 1000V above voltage system. A few inspection appearance that support multiple pile series connection, high voltage system, there is also the problem of on-site deployment difficulty, construction is complicated, seriously limit its application in practical engineering. In view of this, we propose a voltage inspection appearance and voltage inspection system suitable for high voltage series connection electric pile. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the insufficient of prior art, adapting to the actual need, provide a voltage inspection appearance and voltage inspection system suitable for high voltage series connection electric pile, to solve the channel number less, measurement is not synchronous, volume big difficult electric pile detection, voltage insulation low not applicable to multiple pile series connection and high voltage system and deployment construction complicated technical problem that the current electric pile voltage inspection appearance exists.

[0005] To solve the above technical problem, the utility model provides the following technical scheme: a voltage inspection appearance suitable for high voltage series connection electric pile, including upper casing, lower casing, breather valve, PCBA;

[0006] The PCBA includes the isolation power supply circuit for the power supply of internal circuit, central processing circuit, isolation 485 communication circuit, isolation CAN communication circuit, high voltage type SPI isolation communication circuit, analog acquisition circuit, electric connector interface I and electric connector interface II;

[0007] The central processing circuit is connected with the isolated 485 communication circuit and the isolated CAN communication circuit, the high-voltage SPI isolation communication circuit is composed of a plurality of isolated SPI communication chips, the high-voltage SPI isolation circuit is connected with the central processing circuit and the analog acquisition circuit on two sides respectively, the analog acquisition circuit is composed of a plurality of analog acquisition chips, and the electric connector interface II is connected to the electric pile through a cable for acquiring single-cell voltages and transmitting the single-cell voltages to the analog acquisition circuit for analog-digital conversion.

[0008] The voltage inspection instrument and the inspection system have the advantages that special circuit design, like a high-voltage SPI isolation communication circuit, realizes high-voltage electric pile multi-channel synchronous measurement, makes up for the defects of few measurable channels of a single pile and asynchronous measurement, adopts specific structural design, realizes miniaturization and portability, facilitates pile detection, solves the problems of large size and heaviness, can support multiple pile series connection and has high voltage insulation level, overcomes the problem that the voltage inspection instrument cannot be applied to a high-voltage system, and comprehensively improves the quality and stability of voltage inspection.

[0009] Preferably, the PCBA is arranged between the upper casing and the lower casing, and the air vent valve is arranged on the upper casing; the lower casing has a mounting hole, and the upper casing and the lower casing are combined by screws.

[0010] Preferably, the analog acquisition circuit comprises analog acquisition chips U1, resistors R1-R14, capacitors C1-C16 and diodes D1-D12.

[0011] The resistors R1-R13, the capacitors C1-C12 and the diodes D1-D12 form a filter and electrostatic protection circuit, the filter and electrostatic protection circuit acquires single-cell voltages of the electric pile through CELL0-CELL12 ports, and the filter and electrostatic protection circuit is connected with the analog input port of the analog acquisition chip U1 through C0-C12 ports.

[0012] Preferably, the capacitors C13-C16 are used for decoupling the power supply of the analog acquisition chip U1, and the resistor R14 is connected with the CELL0 port and the GND_ISO respectively.

[0013] Preferably, the high-voltage SPI isolation communication circuit comprises SPI isolation chips U2, resistors R15-R18 and capacitors C17-C21.

[0014] The SPI isolation chip U2 is connected with SO, SI, CLK and CS ports through the resistors R15-R18, and the capacitors C17-C21 are connected with power supply ports on two sides of the SPI isolation chip U2 respectively.

[0015] Preferably, the isolated CAN communication circuit comprises an isolated CAN module U3, a capacitor C22, a capacitor C23, a common mode filter inductor LL1, a diode D13, an electrostatic protection tube D14, a current limiting resistor RT1, a current limiting resistor RT2 and a resistor R19, a resistor R20;

[0016] The CANH and CANL pins of the isolated CAN module U3 are connected to the CAN_H and CAN_L ports through the filter inductor LL1, the diode D13, the electrostatic protection tube D14, the current limiting resistor RT1, the current limiting resistor RT2, the diode D13 is connected across the two signal lines, the electrostatic protection tube D14 is connected to the two signal lines and CGND respectively, one end of the resistor R19 and the resistor R20 is connected to the CAN_R port, and the other end is connected to the CAN_H and CAN_L ports respectively, and the capacitor C22 and the capacitor C23 are connected across the power supply ports of the isolated CAN module U3.

[0017] A voltage inspection system comprises a voltage inspection instrument suitable for a high-voltage series stack, a host computer system, a CAN / RS485 server, an adapter power supply, a cable I, a cable II and an RJ45 network cable.

[0018] The electrical connector interface II of the voltage inspection instrument is connected to the stack system through the cable II, the electrical connector interface I is connected to the CAN / RS485 server and the adapter power supply through the cable I, and the CAN / RS485 server is connected to the host computer system through the RJ45 network cable.

[0019] Compared with the prior art, the voltage inspection instrument and the inspection system have the following beneficial effects:

[0020] 1. The voltage inspection instrument and the inspection system have the advantages that special circuit design, such as a high-voltage SPI isolation communication circuit, is adopted to realize high-voltage stack multi-channel synchronous measurement, and the defects of a small number of measurable channels and asynchronous measurement of a single stack are compensated for; specific structural design is adopted to realize miniaturization and portability, facilitate stack detection, and solve the problems of large size and bulkiness; the voltage inspection instrument and the inspection system can also support multiple stack series connection and have high-voltage insulation, and the problems that the voltage inspection instrument and the inspection system cannot be applied to a high-voltage system are overcome, and the quality and stability of voltage inspection are comprehensively improved.

[0021] 2. The voltage inspection instrument and the inspection system have the advantages that various protection measures in the filter and electrostatic protection circuit in the analog acquisition circuit and the isolated CAN communication circuit are adopted to further reduce external interference and electrical fault risks, guarantee the accuracy of data acquisition and the stability of communication, make the stack run more reliably, and reduce faults caused by interference or electrical problems.

[0022] 3. The system structure of this utility model is reasonably designed and easy to install, which reduces the time and manpower costs of on-site deployment. The modular circuit design makes it easier to repair and replace parts, reduces the later maintenance costs, improves the efficiency of use, and saves users economic and time costs. Attached Figure Description

[0023] Figure 1 This is a circuit block diagram of the voltage monitoring instrument in this utility model;

[0024] Figure 2 This is a schematic diagram of the analog acquisition circuit of the voltage inspection instrument in this utility model;

[0025] Figure 3 This is a schematic diagram of the high-voltage SPI isolated communication circuit of the voltage inspection instrument of this utility model;

[0026] Figure 4 This is a schematic diagram of the isolated CAN communication circuit of the voltage inspection instrument in this utility model;

[0027] Figure 5 This is a schematic diagram of the voltage inspection system in this utility model. Detailed Implementation

[0028] Example 1: As shown in the attached document Figure 1 As shown, a voltage monitoring instrument suitable for high-voltage series stacks includes an upper housing, a lower housing, a vent valve, and a PCBA; the PCBA includes an isolated power supply circuit, a central processing circuit, an isolated 485 communication circuit, an isolated CAN communication circuit, a high-voltage SPI isolated communication circuit, an analog acquisition circuit, an electrical connector interface I, and an electrical connector interface II.

[0029] In this embodiment, the PCBA is placed between the upper housing and the lower housing; the vent valve is placed on the upper housing; the upper housing and the lower housing are joined together by screws.

[0030] In the embodiment, the analog acquisition circuit mainly consists of several analog acquisition chips; the high-voltage SPI isolation communication circuit mainly consists of several isolated SPI communication chips; the electrical connector interface II is connected to the battery stack through a cable to obtain the voltage of the single battery; the voltage obtained by the electrical connector interface II is transmitted to the analog acquisition circuit for analog-to-digital conversion; the high-voltage SPI isolation circuit is connected to the central processing circuit and the analog acquisition circuit on both sides, for realizing communication between the two and supplying power to the analog acquisition circuit; the central processing circuit obtains binary data of the voltage information in the form of SPI communication, and after operation processing, the data can be uploaded to the upper system through the isolated 485 communication circuit or the isolated CAN communication circuit; the isolated power supply circuit is used for supplying power to the internal circuit of the voltage inspection instrument.

[0031] In the embodiment, the central processing circuit adopts a 32-bit ARM processor, the ARM processor is a CORTEX-M3 kernel, and a typical model is STM32F103RCT6.

[0032] Embodiment 2: The embodiment gives a specific implementation mode of the analog acquisition circuit, as shown in the accompanying drawings. Figure 2

[0033] In the embodiment, the analog acquisition circuit includes an analog acquisition chip U1, resistors R1-R14, capacitors C1-C16 and diodes D1-D12.

[0034] The resistors R1-R13, capacitors C1-C12 and diodes D1-D12 constitute a filtering and electrostatic protection circuit, the voltage of the single battery of the battery stack is obtained through CELL0-CELL12 ports, the voltage is transmitted to the analog acquisition chip U1 through the connection of C0-C12 ports and the analog input port of the analog acquisition chip U1, and the capacitors C13-C16 are used for decoupling the power supply of the analog acquisition chip U1; the resistor R14 is connected to the CELL0 port and GND_ISO respectively, and is used for providing the low potential reference voltage necessary for the analog-to-digital conversion of the acquisition chip U1.

[0035] The utility model discloses through the filtering and electrostatic protection circuit in analog acquisition circuit, the multiple protection measure design in isolated CAN communication circuit, further reduce the outside interference and electrical failure risk, guarantee the accuracy of data acquisition and the stability of communication, let the battery stack run more reliable, reduce the failure caused by interference or electrical problem.

[0036] In the embodiment, the CELL0-CELL12 ports are connected to the above-mentioned electrical connector II; the SDO, SDI, SCK and CSB ports are connected to the above-mentioned high-voltage SPI isolation circuit.

[0037] ​In this embodiment, the diodes D1-D12 are SMF5.0A; the analog acquisition chip U1 is LTC6804 or LTC6811.

[0038] Embodiment 3: This embodiment gives a specific implementation of the high-voltage SPI isolation communication circuit, as shown in FIG. 3. Figure 3

[0039] In this embodiment, the high-voltage SPI isolation communication circuit includes an SPI isolation chip U2, resistors R15-R18, and capacitors C17-C21; the SPI isolation chip U2 is connected to the SO, SI, CLK, and CS ports through the resistors R15-R18; the capacitors C17-C21 are respectively connected to the power supply ports on both sides of the SPI isolation chip U2 for power decoupling.

[0040] In this embodiment, the SPI isolation chip U2 realizes the electrical isolation between the high-voltage stack and the low-voltage system part of the voltage patrol instrument, and the chip has an isolation power conversion function, which converts the 5V power supply on the primary side to the secondary side for powering the above-mentioned analog acquisition circuit.

[0041] In this embodiment, the typical model of the SPI isolation chip U2 is ISOW7841.

[0042] Embodiment 4: This embodiment gives a specific implementation of the isolation CAN communication circuit, as shown in FIG. 4. Figure 4

[0043] In this embodiment, the isolation CAN communication circuit includes an isolation CAN module U3, a capacitor C22, a capacitor C23, a common-mode filter inductor LL1, a diode D13, an electrostatic protection tube D14, current-limiting resistors RT1 and RT2, and resistors R19 and R20; the CANH and CANL pins of the isolation CAN module U3 are connected to the CAN_H and CAN_L ports through the filter inductor LL1, the diode D13, the electrostatic protection tube D14, the current-limiting resistors RT1 and RT2; the diode D13 is connected across the two signal lines; the electrostatic protection tube D14 is respectively connected to the two signal lines and CGND; one end of the resistors R19 and R20 is connected to the CAN_R port, and the other end is respectively connected to the CAN_H and CAN_L ports; the two ends of the capacitors C22 and C23 are respectively connected to the power supply ports of the isolation CAN module U3.

[0044] ​​In the embodiment, the diode D13 is used for differential mode voltage protection of the CAN bus; the electrostatic protection tube D14 is used for electrostatic protection of the CAN bus; the current limiting resistor RT1 and the current limiting resistor RT2 are used for overcurrent protection of the CAN bus; and the common mode filter inductor LL1 is used for common mode filtering of the CAN signal.

[0045] In the embodiment, the CAN_RX port and the CAN_TX port are connected to the central processing circuit, the CANL port, the CANH port and the CAN_R port are connected to the electric connector I, the typical resistance value of the resistor R19 and the resistor R20 is 60 ohms, and two CANRs are short-circuited at the electric connector I to configure a 120-ohm terminal matching resistor of the CAN bus.

[0046] In the embodiment, the isolation CAN module U3 is of a typical model of CTM1051AM or TD301MCAN, and the common mode filter inductor LL1 is of a typical model of ACT4532-510-2P.

[0047] The voltage inspection instrument and the inspection system have the advantages that, by virtue of special circuit design, such as a high-voltage SPI isolation communication circuit, high-voltage battery multiple-channel synchronous measurement is realized, the defects of a small number of measurable channels and asynchronous measurement of a single stack are compensated, a specific structure design is adopted to realize miniaturization and portability, and the instrument is convenient to detect with the stack, and the problems of large size and bulkiness are solved; the voltage inspection instrument and the inspection system can also support multiple stacks in series and have a high-voltage insulation level, and the problem that the instrument cannot be applied to a high-voltage system is overcome, and the quality and stability of voltage inspection are comprehensively improved.

[0048] Embodiment 5: as shown in the accompanying Figure 5 The voltage inspection system comprises the voltage inspection instrument, a host computer system, a CAN / RS485 server, an adapter power supply, a cable I, a cable II, an RJ45 network cable and the host computer system; the electric connector interface II of the voltage inspection instrument is connected to a battery system through the cable II, the electric connector interface I is connected to the CAN / RS485 server and the adapter power supply through the cable I, and the CAN / RS485 server is connected to the host computer system through the RJ45 network cable.

[0049] In the embodiment, the host computer system runs a WIN7 / WIN10 / WIN11 operating system and is loaded with host computer software based on a LABVIEW platform; the host computer system is built-in with a database and an algorithm, and can perform battery data analysis, processing and storage.

[0050] In the embodiment, the cable I is a 4-core twisted shield cable; 2 cores are used for 24V power supply, and the other 2 cores are used for CAN / RS485 bus.

[0051] The system structure in the utility model has reasonable design, is convenient to install, reduces the time and manpower cost of on-site deployment, the modularized circuit design makes the maintenance and replacement of components more convenient, reduces the later maintenance cost, improves the use efficiency, saves the economic and time cost for the user.

[0052] Working principle: the embodiment provides a voltage inspection instrument and a voltage inspection system suitable for high-voltage series connection electric pile, when in use:

[0053] Power supply: the external power supply is connected through the electric connector interface I, and the isolation power supply circuit converts it into a power supply suitable for internal circuit use, and supplies power for the central processing circuit, the isolated 485 communication circuit, the isolated CAN communication circuit and the high-voltage SPI isolation communication circuit, and guarantees the energy supply of the whole system.

[0054] Voltage acquisition: the electric connector interface II is connected to the electric pile through a cable, acquires single battery voltage, and transmits to the analog acquisition circuit. The analog acquisition chip in the analog acquisition circuit converts the analog voltage signal into a digital signal, and the filter and electrostatic protection circuit in the circuit can effectively remove the noise interference, and guarantee the stability and accuracy of the acquired voltage signal.

[0055] Data communication: the high-voltage SPI isolation communication circuit establishes a communication bridge between the central processing circuit and the analog acquisition circuit, on the one hand, transmits the control instruction of the central processing circuit to the analog acquisition circuit, and on the other hand, transmits the voltage data collected and converted by the analog acquisition circuit to the central processing circuit. Meanwhile, the circuit also has an isolation power conversion function, which converts the 5V power supply on the primary side to the secondary side for supplying power to the analog acquisition circuit, realizes the electrical isolation of the high-voltage electric pile and the low-voltage system part of the voltage inspection instrument, and guarantees the safe operation of the system. The central processing circuit performs operation processing on the acquired voltage data, and then can upload the data to the upper system through the isolated 485 communication circuit or the isolated CAN communication circuit. The common mode filter inductor LL1, the diode D13, the electrostatic protection tube D14 and the current limiting resistor RT1 and the current limiting resistor RT2 in the isolated CAN communication circuit protect and filter the CAN bus, and ensure the reliability of data communication.

[0056] Working principle of the voltage inspection system

[0057] Hardware connection: the electric connector interface I of the voltage inspection instrument is connected to the adapter power supply through the cable I to acquire power supply, and is connected to the CAN / RS485 server for communication interconnection; the electric connector interface II is connected to the electric pile through the cable II to acquire voltage signals. The CAN / RS485 server is connected to the host computer system through the RJ45 network cable.

[0058] Data transmission and processing: multiple voltage patrol instruments access CAN / RS485 bus, and voltage data collected by the voltage patrol instruments are transmitted to the CAN / RS485 server, and the server transmits the data to the upper computer system through the RJ45 network cable. The upper computer system runs WIN7 / WIN10 / WIN11 operating system and carries the upper computer software based on LABVIEW platform, and the built-in database and algorithm can realize real-time display, analysis and processing of the received voltage data of the stack, so as to realize comprehensive monitoring and management of the whole stack system.

[0059] The embodiments of the utility model discloses the better embodiment, but is not limited to this, the ordinary skill of the art, the spirit of the utility model is appreciated to the above-mentioned embodiment, and different extension and change are made, but as long as not departing from the spirit of the utility model, all are within the protection scope of the utility model.

Claims

1. A voltage patrol meter suitable for use with a high voltage series stack, characterized by, The PCBA comprises an isolated power supply circuit for powering internal circuits, a central processing circuit, an isolated 485 communication circuit, an isolated CAN communication circuit, a high-voltage SPI isolation communication circuit, an analog acquisition circuit, an electrical connector interface I, and an electrical connector interface II. The central processing circuit is connected to the isolated 485 communication circuit and the isolated CAN communication circuit, the high-voltage SPI isolation communication circuit is composed of a plurality of isolated SPI communication chips, the high-voltage SPI isolation circuit is connected to the central processing circuit and the analog acquisition circuit on both sides, the analog acquisition circuit is composed of a plurality of analog acquisition chips, and the electrical connector interface II is connected to the battery through a cable for acquiring single-cell battery voltage and transmitting it to the analog acquisition circuit for analog-to-digital conversion. The PCBA is placed between the upper and lower shells, and the air vent is placed on the upper shell; the lower shell has a mounting hole, and the upper and lower shells are combined by screws.

2. A voltage patrol meter for high voltage series connected stacks according to claim 1, characterized in that The analog acquisition circuit comprises an analog acquisition chip U1, resistors R1-R14, capacitors C1-C16, and diodes D1-D12.

3. A voltage patrol meter for high voltage series connected stacks according to claim 1, characterized in that The resistors R1-R13, capacitors C1-C12, and diodes D1-D12 form a filter and electrostatic protection circuit, which acquires single-cell battery voltage of the battery through CELL0-CELL12 ports, and connects the analog input port of the analog acquisition chip U1 through C0-C12 ports. Capacitors C13-C16 are used for decoupling the power supply of the analog acquisition chip U1, and resistor R14 is connected to CELL0 port and GND_ISO respectively.

4. A voltage patrol meter for high voltage series connected stacks according to claim 3, characterized in that The high-voltage SPI isolation communication circuit comprises an SPI isolation chip U2, resistors R15-R18, and capacitors C17-C21.

5. A voltage patrol meter for high voltage series connected stacks according to claim 1, characterized in that, The SPI isolation chip U2 is connected to SO, SI, CLK, and CS ports through resistors R15-R18, and capacitors C17-C21 are connected to the power supply ports on both sides of the SPI isolation chip U2. The isolated CAN communication circuit comprises an isolated CAN module U3, capacitors C22 and C23, a common-mode filter inductor LL1, a diode D13, an electrostatic protection tube D14, current limiting resistors RT1 and RT2, and resistors R19 and R20.

6. A voltage patrol meter for high voltage series connected stacks according to claim 1, characterized in that, ​ The CANH and CANL pins of the isolation CAN module U3 are connected to the CAN_H and CAN_L ports through the filter inductor LL1, the diode D13, the electrostatic protection tube D14, the current-limiting resistor RT1, and the current-limiting resistor RT2, the diode D13 is connected across the two signal lines, the electrostatic protection tube D14 is connected to the two signal lines and CGND respectively, the resistor R19 and the resistor R20 are connected to the CAN_R port at one end and to the CAN_H and CAN_L ports at the other end respectively, and the capacitor C22 and the capacitor C23 are connected to the power supply ports of the isolation CAN module U3 respectively.

7. A voltage patrol system characterized by, The voltage patrol instrument, the host computer system, the CAN / RS485 server, the adapter power supply, the cable I, the cable II, and the RJ45 network cable are suitable for high-voltage series stacks. The electrical connector interface II of the voltage patrol instrument is connected to the stack system through the cable II, the electrical connector interface I is connected to the CAN / RS485 server and the adapter power supply through the cable I, and the CAN / RS485 server is connected to the host computer system through the RJ45 network cable.

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