CN219436656U

CN219436656U - Electric power energy storage battery management system

Info

Publication number: CN219436656U
Application number: CN202222522356.4U
Authority: CN
Inventors: 彭宏伟
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2023-07-28
Anticipated expiration: 2032-09-22

Abstract

The utility model discloses an electric power energy storage battery management system. The system comprises a plurality of single batteries, a subsystem management unit, a collection unit, a storage unit and a control unit, wherein the collection unit is arranged on each single battery, a plurality of single batteries are combined in series to form a battery pack, and the subsystem management unit is in communication connection with each collection unit; the main system management unit is in communication connection with the subsystem management unit; the battery pack is connected in parallel to the high-voltage power distribution unit, and the high-voltage power distribution unit is connected with the main system management unit. The utility model provides an electric power energy storage battery management system which is convenient for step-by-step fault investigation and maintenance and realizes the management application requirements of high-voltage and high-capacity battery packs.

Description

Electric power energy storage battery management system

Technical Field

The embodiment of the utility model relates to the technical field of energy storage systems, in particular to an electric power energy storage battery management system.

Background

With the development of new energy technology and the improvement of the requirements of people on electric energy performance, the inherent intermittent and random characteristics of new energy power generation such as solar energy, wind energy and the like can bring adverse effects to the safe and stable operation of a power grid.

However, the energy storage technology has the characteristic of stable output, and can improve the running quality of the power grid. A reasonable battery management system plays a vital role in the life of the battery pack and the safety of the entire battery system. The existing battery management system usually detects the state data of the single battery, and then directly sends the state data to the main system for analysis and control, so that the detection mode has higher failure rate, is not beneficial to investigation and maintenance, and has higher difficulty in voltage expansion in the high-voltage battery system.

Disclosure of Invention

The utility model provides an electric power energy storage battery management system which is convenient for step-by-step fault investigation, realizes maintenance of a battery pack, meets the expansion management requirement of the battery pack with high voltage and high capacity, and realizes high-voltage battery management.

The embodiment of the utility model provides a power energy storage battery management system, which comprises: the system comprises a main system management unit, a subsystem management unit, an acquisition unit and a high-voltage power distribution unit;

each single battery is provided with the acquisition unit, and the acquisition unit is used for acquiring state data of the single battery;

the plurality of single batteries are combined in series to form a battery pack, and the subsystem management unit is connected with each acquisition unit in a communication manner; the main system management unit is in communication connection with the subsystem management unit; the subsystem management unit is used for summarizing the state data, and the main system management unit is used for obtaining the battery state of the battery pack according to the summarized state data;

the battery pack is connected in parallel to the high-voltage power distribution unit, and the high-voltage power distribution unit is connected with the main system management unit; the main system management unit is also used for carrying out charge and discharge management on each group of battery packs through the high-voltage power distribution unit according to the battery state of each group of battery packs.

Optionally, a main contactor and a fuse are sequentially arranged between the battery pack and the high-voltage distribution unit; the main contactor and the fuse are configured to cut off a current loop when the status data exceeds a threshold.

Optionally, the power energy storage battery management system further comprises a high-voltage management unit;

the high-voltage management unit is connected with the high-voltage distribution unit; the high-voltage management unit is used for collecting the voltage of each group of battery packs;

the main system management unit is connected with the high-voltage management unit; the main system management unit is used for obtaining the battery state of each group of battery packs according to the state data and the voltage.

Optionally, the main system management unit includes a main control chip, a first analog-to-digital conversion unit and a communication isolation unit;

the output end of the first analog-to-digital conversion unit is connected with the main control chip through the communication isolation unit, and the input end of the first analog-to-digital conversion unit is connected with the high-voltage management unit; the main control chip is in communication connection with the subsystem management unit.

Optionally, the main system management unit further comprises an addressing unit; the addressing unit is connected with the main control chip; the addressing unit is used for outputting digital signals, and the main control chip is used for addressing the acquisition unit and the subsystem management unit according to the digital signals.

Optionally, the main system management unit includes at least one communication unit of CAN communication, ethernet communication and RS485 communication.

Optionally, the high-voltage management unit comprises a voltage dividing resistor network, a filter circuit, an analog-digital conversion chip and a high-voltage control chip;

the input end of the voltage dividing resistor network is connected with the positive electrode of the battery pack; the output end of the voltage dividing resistor network is connected with the filter circuit; the filter circuit is connected with the analog-digital conversion chip; the negative electrode of the battery pack is connected with the analog-digital conversion chip, and the voltage dividing resistor network is used for measuring the voltage analog quantity of the battery pack; the analog-digital conversion chip is used for converting the voltage analog quantity into a voltage digital quantity;

the high-voltage control chip is connected with the analog-digital conversion chip; the high-voltage control chip is used for obtaining the voltage of the battery pack according to the voltage digital quantity.

Optionally, the collecting unit comprises a temperature collecting unit; the temperature acquisition unit comprises a temperature control chip, a filtering unit, a switch unit and a second analog-to-digital conversion unit;

the filtering unit is used for acquiring a temperature acquisition signal, filtering and denoising the temperature acquisition signal, and the switching unit is used for outputting the temperature acquisition signal after filtering and denoising to the second analog-to-digital conversion unit; the second analog-to-digital conversion unit is connected with the temperature control chip; the temperature control chip is used for generating the state data according to the temperature acquisition signals after analog-to-digital conversion.

Optionally, the collecting unit further comprises a voltage collecting unit; the voltage acquisition unit comprises a voltage control chip, a filtering equalization circuit, a voltage sampling chip, a signal conversion chip and an isolation transformer;

the filter equalization circuit is used for acquiring a voltage sampling signal of the single battery, and is connected with the voltage sampling chip; the voltage sampling chip is connected with the signal conversion chip; the isolation transformer is arranged between the voltage sampling chip and the signal conversion chip; the isolation transformer is used for electrically isolating the voltage sampling chip from the signal conversion chip.

Optionally, the collecting unit further comprises a voltage collecting unit; the voltage acquisition unit comprises a voltage control chip, a multipath filtering equalization circuit, a multipath voltage sampling chip, a signal conversion chip and an isolation transformer;

the voltage sampling signals of the first path of single batteries are connected to the first path of filter equalization circuits, and the first path of filter equalization circuits are connected with the first path of voltage sampling chips; the first path of the voltage sampling chip is connected with the signal conversion chip; the isolation transformer is arranged between the voltage sampling chip and the signal conversion chip;

the voltage sampling signal of the nth single battery is connected to the nth filter equalizing circuit, and the nth filter equalizing circuit is connected with the nth voltage sampling chip; the N-th voltage sampling chip is connected with the N-1-th voltage sampling chip in a transformer daisy chain manner; wherein N is a positive integer greater than or equal to 2.

According to the technical scheme provided by the embodiment of the utility model, the independent collection, summarization and data processing of the state data of the single battery and the battery pack are realized through the step-by-step management of the main system management unit, the subsystem management unit and the collection unit, so that the step-by-step fault investigation and maintenance of the battery management system are facilitated, and the application requirements of the high-voltage and high-capacity battery pack are met through the expansion of the battery pack.

Drawings

Fig. 1 is a schematic structural diagram of an electric power energy storage battery management system according to an embodiment of the present utility model.

Fig. 2 is a schematic structural diagram of a main system management unit according to an embodiment of the present utility model.

Fig. 3 is a schematic structural diagram of a high voltage management unit according to an embodiment of the present utility model.

Fig. 4 is a schematic structural diagram of a temperature acquisition unit according to an embodiment of the present utility model.

Fig. 5 is a schematic structural diagram of a voltage acquisition unit according to an embodiment of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Fig. 1 is a schematic structural diagram of an electric power energy storage battery management system according to an embodiment of the present utility model, referring to fig. 1, including: a main system management unit 110, a subsystem management unit 120, an acquisition unit 140, and a high voltage distribution unit 130;

each single battery is provided with an acquisition unit 140, and the acquisition unit 140 is used for acquiring state data of the single battery;

the plurality of single batteries are connected in series and combined into a battery pack, and the subsystem management unit is connected with each acquisition unit 140 in a communication manner; the main system management unit 110 is in communication connection with the subsystem management unit 120; the subsystem management unit 120 is configured to aggregate status data, and the main system management unit 110 is configured to obtain a battery status of the battery pack according to the aggregated status data;

the battery pack is connected in parallel to the high-voltage power distribution unit 130, and the high-voltage power distribution unit 130 is connected with the main system management unit 110; the main system management unit 110 is further configured to perform charge and discharge management on each group of battery packs through the high-voltage power distribution unit 130 according to the battery state of each group of battery packs.

Specifically, a plurality of single batteries are electrically connected to form a battery pack, and the single batteries are integrated in a grouping mode to realize modularized detection. The number of the single batteries in each battery pack can be adjusted according to the energy storage capacity, the battery capacity can be improved through the expansion of a plurality of groups of battery packs, the voltage level is expanded, each group of battery packs is connected in parallel to the high-voltage distribution unit 130, the high-voltage distribution unit 130 is connected with an alternating current power grid through the energy storage converter and the like 190, the high-voltage distribution unit 130 enables the battery packs to complete charging and discharging according to the control instructions of the main system management unit 110 (master battery management unit, MBMU), and the high-voltage distribution unit 130 comprises electric equipment such as a high-voltage distribution box and a bus bar. The unit cells in each group of battery packs are correspondingly provided with a collection unit 140, and the collection unit 140 collects state data of the unit cells, for example, state parameters such as voltage, current, temperature and the like of the unit cells, so that each unit cell is monitored. Each battery pack is provided with a subsystem management unit 120 (slave battery management unit, SBMU), and the acquisition units 140 in the same battery pack are connected with the subsystem management units 120, wherein the acquisition units 140 and the subsystem management units 120 CAN realize data transceiving in a communication mode such as CAN communication or ethernet communication. The subsystem management unit 120 collects the status data of the collection unit 140 in the battery packs, where the number of the subsystem management units 120 is the same as that of the battery packs, that is, each battery pack is configured with a subsystem management unit 120, and the subsystem management unit 120 may control the unit cells based on the status data of the unit cells, for example, pre-charging, charging and discharging management of the unit cells, and generate reporting data according to the status data of the battery packs, and send the reporting data to the upper management unit.

The main system management unit 110 is connected to the sub-main system management unit 120, where a communication manner between the main system management unit 110 and the sub-main system management unit 120 at least includes one of CAN communication, ethernet communication and RS485 communication. The main system management unit 110 manages the charging and discharging processes of the battery packs, performs fault alarm and emergency protection processing, ensures safe and reliable operation of the batteries, manages the plurality of sub-main system management units 120 through a communication bus, and realizes charging and discharging control on each group of batteries by collecting state data of each group of battery packs, estimating the battery state (state of charge) according to the state data.

According to the technical scheme provided by the embodiment of the utility model, the independent collection, summarization and data processing of the state data of the single battery and the battery pack are realized through the step-by-step management of the main system management unit, the subsystem management unit and the collection unit, so that the step-by-step fault investigation and maintenance are facilitated, and the application requirements of the high-voltage and high-capacity battery pack are met through the expansion of the battery pack.

With continued reference to fig. 1, a main contactor 160 and a fuse 170 are provided in sequence between the battery pack and the high voltage power distribution unit 130; the main contactor 160 and the fuse 170 are used to cut off the current loop when the status data exceeds a threshold.

Specifically, each battery pack is connected in parallel to the high-voltage power distribution unit 130, when the battery system is running, and when the state parameters such as voltage, current, temperature and the like of the battery pack exceed the safety protection threshold, the loop of the battery pack needs to be cut off in time, so that the main contactor 160 and the fuse 170 are sequentially arranged between the battery pack and the high-voltage power distribution unit 130, namely, the main contactor 160 and the fuse 170 are connected in series on the line between the battery pack and the high-voltage power distribution unit 130, and when the battery pack is abnormal, the fault battery pack is isolated, so that the fault battery pack is out of operation.

Optionally, the power energy storage battery management system further includes a display unit 180, where the display unit 180 is connected to the main system management unit 110, and the display unit 180 is connected to an external device in a communication manner, where the display unit 180 may display status data collected by the main system management unit 110 and the sub-main system management unit 120, status data of a single battery in the battery pack, and status information of each management unit, so as to monitor data of the battery management system. The display unit 180 may also be used as a control unit to perform parameter calibration, communication, logic operation, program writing and data storage on the main system management unit 110, the subsystem management unit 120, the acquisition unit 140, and the like, so as to perform main control and use for data interaction with engineering personnel. Optionally, the power energy storage battery management system further comprises a monitoring system, the monitoring system is in communication connection with the display unit and the external device through the ethernet, and the monitoring system can real-time state parameters of the power energy storage battery management system.

Optionally, the power storage battery management system further includes a high voltage management unit 210;

the high voltage management unit 210 is connected with the high voltage distribution unit 130; the high voltage management unit 210 is used for collecting the voltage of each group of battery packs;

the main system management unit 110 is connected with the high voltage management unit 210; the main system management unit 110 is used for estimating the battery state of each group of battery packs according to the state data and the voltage.

Specifically, a voltage dividing resistor network is disposed in the high voltage management unit 210, and high voltage data of each group of battery packs is collected based on resistor voltage division, so as to count the branch current and the charge and discharge power of the battery packs, and thus, accumulated ampere hours, accumulated electric quantity, insulation detection and the like can be performed. While the main system management unit 110 estimates the battery state (state of charge) of each group of battery packs from the voltage of the battery packs detected by the high voltage management unit 210 and the summarized voltage and current data.

Fig. 2 is a schematic structural diagram of a main system management unit according to an embodiment of the present utility model, referring to fig. 2, the main system management unit 110 includes a main control chip 220, a first analog-to-digital conversion unit 230, and a communication isolation unit 240;

the output end of the first analog-to-digital conversion unit 230 is connected with the main control chip 220 through the communication isolation unit 240, and the input end of the first analog-to-digital conversion unit 230 is connected with the high-voltage management unit 210; the main control chip 220 is communicatively connected to the subsystem management unit 120.

Specifically, the main control chip 220 is a control unit of the main system management unit 110, and analog quantities of state data such as voltage, total voltage of the battery pack, and current of the single battery collected by the high voltage management unit 210 are input to the main control chip 220 through the first analog-to-digital conversion unit 230, and the main control chip 220 performs corresponding processing according to the input data, for example, battery state calculation, state data threshold judgment, and the like. The communication isolation unit 240 is disposed between the main control chip 220 and the first analog-to-digital conversion unit 230, which is beneficial to eliminating signal interference and external signal interference in the transmission process. For example, the first analog-to-digital conversion unit 230 and the communication isolation unit 240 may be integrated in the main control chip 220. Preferably, the main control chip 220 may be STM32F407Z, and it should be noted that the main control chip 220 packaged equally may be replaced. The main control chip 220 further comprises a power supply unit, wherein the power supply unit comprises a direct current-direct current converter (DCDC) and an LDO unit, and a working power supply is input to the DC-direct current converter and converted into a working voltage of the main control chip 220 through the LDO. The power supply unit supports a 9-32V power supply constant power supply mode, and supports hard wire wake-up, A+ rising edge wake-up and RTC wake-up. The controllable power output controlled by the high-side switch is provided, wherein one path of the switch power outputs +/-12V power, the other path of the switch power supports LDO to output 5V power, and the main control chip 220 can also output power as a controlled power to supply power for the high-voltage management unit 210. The main control chip 220 provides multiple paths of analog input ports, and CAN realize multiple paths of NTC temperature detection and current detection of a Hall current sensor based on a CAN bus. The main control chip 220 is designed to separate devices, realize isolated digital input, relay type digital output, namely a dry contact, and support 1-path independent HVIL signal to realize a high-voltage interlocking function. High pressure measurement: and the total voltage of the battery pack, the voltage of the single battery and insulation detection are supported. One current supports the shot sensor and the other current supports the Hall sensor. High-pressure control: the control output of the 6-way high-side switch is supported, the 2-way low-side switch is supported, the high-side switch adopts a vehicle-standard chip, and the high-side switch chip with 24V power supply is supported. And on the basis of the NTP time synchronization of the Ethernet, adopting SNTP and designing a time synchronization message on a CAN bus.

Optionally, the power energy storage battery management system further comprises an addressing unit; the addressing unit is connected with the main control chip 220; the addressing unit is used for outputting digital signals, and the main control chip 220 is used for addressing the acquisition unit 140 and the subsystem management unit 120 according to the digital signals.

Specifically, the addressing unit inputs a digital signal, where the digital signal may be generated based on a communication port protocol, and the main control chip 220 addresses according to the digital signal, so as to address the next-stage subsystem management unit 120 and the acquisition unit 140, and when there are multiple groups of subsystem management units 120 and acquisition units 140, the corresponding units may be controlled according to the addressing information, so as to implement signal transmission and control. The coding unit is connected to the coding digital input end of the main control chip 220, and the main control unit outputs the coded data from the coding digital output end.

Optionally, the main control unit includes at least one communication unit of CAN communication, ethernet communication and RS485 communication.

Specifically, the main control chip 220 includes at least one of CAN communication, ethernet communication and RS485 communication, and facilitates communication connection between systems and communication expansion of external devices by providing multiple communication modes. Wherein. CAN communication may be isolated communication connected with the isolated communication unit and non-isolated communication not connected with the isolated communication unit to enrich the communication interface. The communication isolation unit 240 is arranged between the RS485 communication and the main control chip 220, and the stability of communication signals can be improved by arranging the isolation unit because of the interference of a grounding loop, transient voltage and the like during remote transmission. The CAN communication and the RS485 communication CAN share a power supply, so that the design area of hardware is reduced. And performing system time synchronization based on the NTP time synchronization of the Ethernet. With continued reference to fig. 1, the main system management unit 110 may be in CAN communication with the subsystem management unit 120, and the acquisition unit 140, and the main control chip 220 may automatically address according to a debug interface of the BMU of the CAN interface, so as to confirm addresses of the units, thereby facilitating communication data transmission.

Fig. 3 is a schematic structural diagram of a high voltage management unit according to an embodiment of the present utility model, referring to fig. 3, the high voltage management unit 210 includes a voltage dividing resistor network 310, a filter circuit 320, an analog-digital conversion chip 330 and a high voltage control chip 340;

the input end of the voltage dividing resistor network 310 is connected with the positive electrode of the battery pack; the output end of the voltage dividing resistor network 310 is connected with the filter circuit 320; the filter circuit 320 is connected with the analog-digital conversion chip 330; the negative electrode of the battery pack is connected with the analog-digital conversion chip 330, and the voltage dividing resistor network 310 is used for measuring the voltage analog quantity of the battery pack; the analog-to-digital conversion chip 330 is used for converting the voltage analog quantity into a voltage digital quantity;

the high voltage control chip 340 is connected with the analog-to-digital conversion chip 330; the high voltage control chip 340 is used to obtain the voltage of the battery pack according to the voltage digital quantity.

Specifically, the high voltage management unit 210 collects voltages of a plurality of groups of battery packs, and correspondingly sets the voltage dividing resistor network 310 and the filter circuit 320 according to the number of the battery packs. In an exemplary embodiment, taking the first group as an example, the positive electrode of the battery pack is connected to the voltage dividing resistor network 310, where the resistance values of the voltage dividing resistors are the same, so that the total voltage of the first group of battery pack can be obtained by measuring the voltage of the voltage dividing resistors, the output signal of the voltage dividing resistor network 310 is filtered and noise reduced by the filter circuit 320, and is input to the analog-digital conversion chip 330, the analog-digital conversion chip 330 converts the signal type and then outputs to the high-voltage control chip 340, and the high-voltage control chip 340 performs data processing and signal transmission. The second and third battery packs are similarly connected.

The analog-digital conversion chip 330 and the high-voltage control chip 340 may use the same working power source, wherein the working power source input is output to the analog-digital conversion chip 330 through the dc-dc converter DCDC, and the other path is input to the high-voltage control chip 340 through the LDO, so that the working power source meets the power requirement of the high-voltage control chip 340. The high voltage control chip 340 communicates with the outside through the CAN chip, for example, the main system control unit and the subsystem control unit, etc. realize CAN communication. The high voltage control chip 340 is further provided with a digital input terminal and a digital output terminal for connecting with an external digital input/output. Illustratively, the model STM32F103 or GDGDGD 32F103 of the high voltage control chip 340 may be used to illustrate that equally packaged high voltage control chips 340 may be substituted.

Fig. 4 is a schematic structural diagram of a temperature acquisition unit according to an embodiment of the present utility model, referring to fig. 4 in conjunction with fig. 1, the acquisition unit 140 includes a temperature acquisition unit 141; the temperature acquisition unit 141 includes a temperature control chip 410, a filtering unit 430, a switching unit 420, and a second analog-to-digital conversion unit 440;

the filtering unit 430 is configured to obtain a temperature acquisition signal, filter and reduce noise on the temperature acquisition signal, and the switching unit 420 is configured to output the filtered and noise-reduced temperature acquisition signal to the second analog-to-digital conversion unit 440; the second analog-to-digital conversion unit 440 is connected with the temperature control chip 410; the temperature control chip 410 is configured to generate status data according to the analog-to-digital converted temperature acquisition signal.

Specifically, the temperature acquisition unit 141 acquires the temperatures of the single batteries, and according to the number of single batteries in each battery pack, the corresponding number of temperature sampling signals are input to the filtering unit 430 for noise reduction processing, and the temperature sampling signals are input to the second analog-to-digital conversion unit 440 through the selection of the multi-path switch unit 420. And then the second analog-to-digital conversion unit 440 is input to the temperature control chip 410 for data processing. The battery pack according to the embodiment of the present utility model is three sets, so the three sets of paths of the sampling process are illustrated in the drawings, but the present utility model is not limited thereto.

The second analog-to-digital conversion unit 440 and the temperature control chip 410 may use the same working power supply, the temperature acquisition unit 141 further includes an LDO and a dc-to-dc conversion unit DCDC, and the working power supply is input to the LDO through the dc-to-dc converter DCDC and output to the second analog-to-digital conversion unit 440 and the temperature control chip 410 respectively, so that the working power supply meets the power supply requirements of the high voltage control chip 340 and the second analog-to-digital conversion unit 440. To avoid power supply crosstalk of the second analog-to-digital conversion unit 440, an isolated power supply may be provided between the second analog-to-digital conversion unit 440 and the LDO.

Communication isolation is arranged between the second analog-to-digital conversion unit 440 and the temperature control chip 410, an isolation optocoupler is arranged between the temperature control chip 410 and the switch unit 420, and an isolation scheme is adopted to reduce interference between transmission signals. The temperature control chip 410 communicates with the outside through the CAN chip, for example, the main system control unit and the subsystem control unit, etc., to realize CAN communication. The temperature control chip 410 is further provided with a digital input end and a digital output end for digital input and output and automatic coding, and a dry junction point output for controlling the output of data signals. Illustratively, the model STM32F103 or GDGDGD 32F103 of the temperature control chip 410 may be replaced with an equally packaged temperature control chip 410.

Fig. 5 is a schematic structural diagram of a voltage acquisition unit according to an embodiment of the present utility model, referring to fig. 5, the acquisition unit 140 further includes a voltage acquisition unit 142; the voltage acquisition unit 142 comprises a voltage control chip 510, a filter equalization circuit 520, a voltage sampling chip 530, a signal conversion chip 540 and an isolation transformer;

the filter equalization circuit 520 is used for obtaining a voltage sampling signal of the single battery, and the filter equalization circuit 520 is connected with the voltage sampling chip 530; the voltage sampling chip 530 is connected with the signal conversion chip 540; an isolation transformer 550 is disposed between the voltage sampling chip 530 and the signal conversion chip 540. Isolation transformer 550 is used for electrical isolation between voltage sampling die 530 and signal conversion die 540.

Specifically, the voltage acquisition unit 142 acquires the voltages of the single batteries, and according to the number of the single batteries in each group of battery packs, the voltage sampling signals with corresponding numbers are input into the filtering equalization circuit 520 for filtering and current equalization, and the voltages of the single batteries are acquired through the voltage sampling chip 530, where the voltage sampling chip 530 may be an AFE chip.

And voltage in each battery pack is acquired by adopting an analog IO port reserved by an AFE, the resistance is matched and designed according to a 10K temperature sensor, and the temperature of the battery is measured within the range of-40 to 125 ℃. The AFE is provided with an external equalizing switch, the equalizing resistance is 39 omega/1.5W & gt 60mA, and the equalizing temperature rise is controlled at 40 ℃. When selecting an AFE chip, the acquisition accuracy and measurement error need to be considered. As well as the number of sampling channels, the number of internal ADCs, the type and architecture, etc. The voltage signal collected by the voltage sampling chip 530 is input to the voltage control chip 510 through the signal conversion chip 540. An isolation transformer 550 is disposed between the voltage sampling chip 530 and the signal conversion chip 540, so as to improve the anti-interference capability between the voltage sampling chip 530 and the signal conversion chip 540, and prevent transmission of a part of harmonic waves.

The voltage acquisition unit 142 further includes a power chip, and the working power input is output to the voltage control chip 510 through the power chip, so that the working power meets the power requirement of the voltage control chip 510. The voltage control chip 510 communicates with the outside through a CAN chip, for example, a main system control unit, a subsystem control unit, and the like, to realize CAN communication. The voltage control chip 510 is further provided with a digital input end and a digital output end for digital input and output and automatic coding, and a dry junction point output for controlling the output of data signals. Illustratively, the model STM32F103 or GDGD32F103 of the voltage control chip 510 may be replaced by an equally packaged voltage control chip 510.

Optionally, with continued reference to fig. 5, in the multi-group battery pack detection, the voltage acquisition unit 142 needs to configure a multi-path filter equalization circuit 520 and a multi-path voltage sampling chip 530;

the voltage sampling signal of the first path of single battery is connected to the first path of filter equalizing circuit 520, and the first path of filter equalizing circuit 520 is connected with the first path of voltage sampling chip 530; the first path voltage sampling chip 530 is connected with the signal conversion chip 540; an isolation transformer 550 is disposed between the voltage sampling chip 530 and the signal conversion chip 540;

the voltage sampling signal of the nth single battery is connected to the nth filter equalizing circuit 520, and the nth filter equalizing circuit 520 is connected with the nth voltage sampling chip 530; the N-th voltage sampling chip 530 is connected with the N-1-th voltage sampling chip 530 in a transformer daisy chain manner; wherein N is a positive integer greater than or equal to 2.

Specifically, referring to fig. 5, taking three paths of collection as an example, an isolation transformer 550 is disposed between the first path of voltage sampling chip 530 and the second path of voltage sampling chip 530, another isolation transformer 550 is disposed between the third path of voltage sampling chip 530 and the third path of voltage sampling chip 530, where the isolation transformer 550 is used as communication isolation, the voltage sampling chips 530 are connected in a transformer daisy-chain manner, the voltage control chip 510 communicates signals with the first AFE board in the form of differential signals through the signal conversion chip 540, and after the differential signals are output from the first AFE, the differential signals sequentially enter the subsequent AFE, so that the voltage control chip 510 can communicate with all the AFEs finally. Isolation communication is required between the AFEs, and the isolation device used is typically an isolation transformer 550 or a high voltage capacitor.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A power storage battery management system, comprising: the system comprises a main system management unit, a subsystem management unit, an acquisition unit and a high-voltage power distribution unit;

the plurality of single batteries are combined in series to form a battery pack, and the acquisition units in the same battery pack are connected with the subsystem management unit; the subsystem management unit is the same as the battery packs in number; the main system management unit is in communication connection with the subsystem management unit; the subsystem management unit is used for summarizing the state data, and the main system management unit is used for obtaining the battery state of the battery pack according to the summarized state data;

2. The power storage battery management system according to claim 1, wherein a main contactor and a fuse are sequentially provided between the battery pack and the high-voltage distribution unit; the main contactor and the fuse are configured to cut off a current loop when the status data exceeds a threshold.

3. The power storage battery management system of claim 1, further comprising a high voltage management unit;

4. The power storage battery management system of claim 3, wherein the main system management unit comprises a main control chip, a first analog-to-digital conversion unit and a communication isolation unit;

5. The power storage battery management system of claim 4, wherein the main system management unit further comprises an addressing unit; the addressing unit is connected with the main control chip; the addressing unit is used for outputting digital signals, and the main control chip is used for addressing the acquisition unit and the subsystem management unit according to the digital signals.

6. A power storage battery management system according to claim 3, wherein the main system management unit comprises at least one of CAN communication, ethernet communication and RS485 communication.

7. The power storage battery management system of claim 3, wherein the high voltage management unit comprises a voltage dividing resistor network, a filter circuit, an analog-to-digital conversion chip, and a high voltage control chip;

8. The power storage battery management system according to any one of claims 1 to 7, wherein: the acquisition unit comprises a temperature acquisition unit; the temperature acquisition unit comprises a temperature control chip, a filtering unit, a switch unit and a second analog-to-digital conversion unit;

9. The power storage battery management system of claim 8, wherein the acquisition unit further comprises a voltage acquisition unit; the voltage acquisition unit comprises a voltage control chip, a filtering equalization circuit, a voltage sampling chip, a signal conversion chip and an isolation transformer;

10. The electrical energy storage battery management system of claim 8, wherein: the acquisition unit further comprises a voltage acquisition unit; the voltage acquisition unit comprises a voltage control chip, a multipath filtering equalization circuit, a multipath voltage sampling chip, a signal conversion chip and an isolation transformer;