Battery management system and energy storage system

Abstract

The invention provides a battery management system and an energy storage system, and relates to the technical field of energy storage system management, and the battery management system comprises a battery system and a power conversion system. The battery system comprises a battery pack; the power conversion system comprises an acquisition and calculation module and an energy management module, the acquisition and calculation module is in communication connection with the battery pack through a first bus, the acquisition and calculation module is used for acquiring working data of the battery pack and calculating to obtain a battery state index, and the energy management module comprises a summarizing unit and a communication unit. The summarizing unit is used for summarizing the battery state indexes to obtain summarized data, and the communication unit is used for uploading the summarized data to an upper computer through a second bus to accelerate the response speed of the battery management system.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage system management, and in particular to a battery management system and an energy storage system. Background Art

[0002] Energy storage is a system used to store and release electrical energy, and is widely used in power systems, renewable energy, electric vehicles, industrial and commercial buildings, etc. Energy storage can improve the flexibility, reliability and efficiency of power systems, while helping to balance supply and demand, smooth load fluctuations and increase the utilization of renewable energy.

[0003] In a conventional system framework, the battery management system (BMS) is divided into multiple levels. The BMS is divided into a master control and multiple slave controls, and interacts with the PCS through an aggregation board. When the master BMS fails or alarms, the master BMS is isolated through the system and reset through a set method to ensure that the system continues to operate. However, in this framework, the PCS needs to pass through multiple levels of information to obtain battery information, and the system architecture is complex, resulting in poor system stability and slow system response. Summary of the invention

[0004] The problem solved by the present invention is how to speed up the system response of a battery management system.

[0005] In order to solve the above problems, the present invention provides a battery management system, including a battery system and a power conversion system;

[0006] The battery system includes a battery pack;

[0007] The power conversion system includes a collection and calculation module and an energy management module. The collection and calculation module is connected to the battery pack through a first bus. The collection and calculation module is used to collect the working data of the battery pack and calculate the battery status index. The energy management module includes a summary unit and a communication unit. The summary unit is used to summarize the battery status index to obtain summary data. The communication unit is used to upload the summary data to the host computer through a second bus.

[0008] The beneficial effects of the present invention include: by connecting the battery pack with the acquisition and calculation module through the first bus communication, the working data from the battery pack can be directly obtained, and the secondary BMS controller and the summary board are reduced while retaining the original system functions; the working data from the battery pack is collected and calculated by the acquisition and calculation module, and a battery status indicator that can measure the battery status is obtained; the battery status indicator from the battery pack is summarized by the energy management module, and the summarized data is uploaded to the host computer through the communication unit. Under the premise of retaining all system functions, the number of modules in the system is reduced; the energy management module directly processes the summary communication signal and the hard-wired signal, which can reduce the communication interface; the battery pack and the power conversion system are directly connected through the first bus, so that the communication architecture of the battery management system is more refined, which can reduce repeated data processing processes and reduce data transmission time, reduce the additional logic processing time of the summary board, simplify the two levels of BMS into one level of BMS, further reduce the logic processing time, and speed up the response speed.

[0009] Optionally, the acquisition and calculation module includes an acquisition unit and a calculation unit, the acquisition unit is used to obtain the working data of the battery pack through the first bus, and the calculation unit is used to calculate the battery status indicator according to the working data.

[0010] Optionally, the operating data includes at least one of the voltage, current and temperature of the battery pack; the battery status indicator includes at least one of the total voltage, total current and battery status parameter of a battery cluster, and the battery cluster includes at least one of the battery packs.

[0011] Optionally, the power conversion system further includes a power module, which is used to adjust the voltage and current from the power generation end, and is also used to adjust the voltage and current output to the battery pack.

[0012] Optionally, the acquisition and calculation module also includes I / O signal dry contacts, which include fire contacts, emergency stop contacts and external control contacts. The fire contacts are used to connect to the fire protection system, the emergency stop contacts are used to cut off the power supply, and the external control contacts are used to communicate with the external system and receive the status signal of the external system.

[0013] Optionally, the power conversion system further comprises a hard-wire signal logic control module, wherein the hard-wire signal logic control module is used to process a hard-wire input signal and generate a hard-wire output signal, wherein the hard-wire output signal is used to control an external system.

[0014] Optionally, the power conversion system is also used to address working equipment in a battery management system, and the working equipment includes the battery pack.

[0015] Optionally, the communication unit is further used to send control instructions to the battery pack through the first bus, and the control instructions include charge and discharge control instructions and battery status monitoring requests.

[0016] Optionally, the power conversion system is further used to obtain a control instruction from a host computer when the battery status indicator is in an abnormal indicator interval, and isolate the battery pack in the abnormal indicator interval according to the control instruction.

[0017] In a second aspect, the present invention further provides an energy storage system, which includes the battery management system as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 An exemplary diagram of a battery management system according to an embodiment of the present invention;

[0019] Figure 2 Another exemplary diagram of a battery management system according to an embodiment of the present invention;

[0020] Figure 3 FIG. 4 is an architecture diagram of a battery management system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0022] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0023] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0024] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0025] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes, and are not used to limit the scope of these messages or information.

[0026] In view of the problems existing in the above-mentioned related technologies, this embodiment provides a battery management system and an energy storage system.

[0027] like Figure 1 and Figure 3 As shown, a battery management system provided by an embodiment of the present invention includes a battery system and a power conversion system;

[0028] The battery system includes a battery pack.

[0029] The power conversion system includes a collection and calculation module and an energy management module. The collection and calculation module is connected to the battery pack through a first bus communication. The collection and calculation module is used to collect the working data of the battery pack and calculate the battery status index. The energy management module includes a summary unit and a communication unit. The summary unit is used to summarize the battery status index to obtain summary data. The communication unit is used to upload the summary data to the host computer through the second bus.

[0030] In one embodiment, the battery management system is used to be electrically connected to the host computer and the power generation end respectively. The host computer can be a high-performance computer or server, which is responsible for advanced monitoring, control, data processing and management tasks. The host computer is connected to the communication unit through the first bus and the second bus, and receives the summary data sent from the communication unit according to the second bus. The operating status of each device and module in the battery management system, including battery packs, inverters, sensors, etc., is monitored in real time through the summary data. The host computer also obtains control instructions by processing the summary data, and sends the control instructions to the communication unit through the second bus to control the working status and safety content of the battery management system.

[0031] In other embodiments, the host computer is also used for data storage and management, wherein data storage includes storing the collected data and generated reports in a database to facilitate subsequent query and analysis; data management includes data backup, which is used to regularly back up data to ensure data security and integrity.

[0032] In other embodiments, the communication unit further includes a wireless communication unit and a wired communication unit, wherein the wireless communication unit includes one or more of Bluetooth communication, GPS communication, and 4G communication; and the wired communication unit is connected via wired communication. The wireless communication unit and the wired communication unit are used to realize remote monitoring, remote diagnosis, remote maintenance, and remote control of the system.

[0033] Specifically, in an embodiment of the present invention, under the premise of retaining the original system functions, the secondary BMS controller and the summary board are reduced, and the collection and calculation module and the energy management module are integrated through the power conversion system to realize direct acquisition and processing of battery pack information through the power conversion system, reduce communication interfaces at the hardware level, simplify the control hierarchy at the architecture level, and speed up the response. At the practical level, the battery management system can be standardized and the functions can be integrated into the power conversion system. The functional requirements of the battery pack products are relatively low, and more battery pack products can be adapted.

[0034] Optionally, the power conversion system may be a PCS (Power Conversion System), and the energy management module may be an EMS (Energy Management System).

[0035] like Figure 2As shown, when the battery management system is working, since the battery pack and the communication unit in the acquisition and calculation module are connected through the first bus (CAN1), the acquisition and calculation module can directly obtain working data such as voltage and current from the battery pack, and process the working data to obtain a battery status indicator for measuring the battery status, and summarize the data through the summary unit in the energy management module to obtain the summary data of all battery packs, and upload the summary data to the host computer through the communication unit, and form control instructions through the host computer for subsequent control of the working status and safety-related content of the battery management system.

[0036] The battery pack is communicatively connected to the power conversion system via a first bus for directly acquiring operating data from the battery pack.

[0037] The battery management system architecture in this embodiment simplifies the control hierarchy and improves the response speed and safety of the system by integrating the functions of the BMS responsible for aggregating the battery pack into the EMS functional module in the PCS.

[0038] In this embodiment, by connecting the battery pack with the acquisition and calculation module through the first bus communication, the working data from the battery pack can be directly obtained. Under the premise of retaining the original system functions, the secondary BMS controller and the summary board are reduced. The working data from the battery pack is collected and calculated by the acquisition and calculation module, and the battery status index that can measure the battery status is obtained. The battery status index from the battery pack is summarized by the energy management module, and the summarized data is uploaded to the host computer through the communication unit. Under the premise of retaining all system functions, the number of modules in the system is reduced. The energy management module directly processes the summary communication signal and the hard-wired signal, which can reduce the communication interface. The battery pack and the power conversion system are directly connected through the first bus, so that the communication architecture of the battery management system is more refined, which can reduce repeated data processing processes and reduce data transmission time, reduce the additional logic processing time of the summary board, simplify the two levels of BMS into one level of BMS, further reduce the logic processing time, and speed up the response speed.

[0039] Alternatively, if Figure 2 As shown, the acquisition and calculation module includes an acquisition unit and a calculation unit. The acquisition unit is used to obtain the working data of the battery pack through the first bus, and the calculation unit is used to calculate the battery status index according to the working data.

[0040] The acquisition unit directly obtains real-time working data from the battery pack through the first bus. These data may include but are not limited to key parameters such as voltage, current, temperature, etc. After receiving the data from the acquisition unit, the calculation unit is responsible for processing these raw data, such as pre-processing steps such as filtering, to improve the accuracy of subsequent analysis. Based on the processed data, the calculation unit uses a pre-defined algorithm model to calculate the battery status indicators. Such as predicting the remaining useful life (Remaining Useful Life, RUL), health state (State of Health, SOH), state of charge (State of Charge, SOC), etc.

[0041] Optionally, the operating data includes at least one of the voltage, current and temperature of the battery pack.

[0042] Optionally, the battery status indicator includes at least one of a total voltage, a total current and a battery status parameter of a battery cluster, and the battery cluster includes at least one battery pack.

[0043] In one embodiment, multiple battery packs form a battery cluster. By acquiring and processing the working data of the battery packs, the total voltage and total current of the battery cluster are obtained for monitoring and adjusting the battery cluster. The battery status parameter may be SOX, which is used to represent various status parameters of the battery. In the BMS, these SOX parameters are calculated in order to comprehensively evaluate the battery status and ensure the safe, efficient and reliable operation of the battery. "X" can represent different letters, each of which corresponds to a specific battery status indicator. Including:

[0044] SOC (State of Charge): SOC indicates the state of charge of the battery, that is, the percentage of the battery's current remaining power to the total capacity. It is used to evaluate the battery's current power level and help decide whether charging or discharging is needed. It is estimated by current integration method, open circuit voltage method or model prediction method.

[0045] SOH (State of Health) indicates the health status of the battery, reflecting the degree of performance degradation of the battery relative to a new battery. It is used to evaluate the battery life and performance degradation, and help predict the remaining service life of the battery. It is evaluated by comparing the actual capacity of the battery with the rated capacity, internal resistance change and other parameters.

[0046] SOP (State of Power) indicates the power state of the battery, reflecting the maximum power that the battery can provide in the current state. It is used to evaluate the power output capability of the battery under specific conditions to ensure that the system does not exceed the maximum power limit of the battery. It is estimated through battery voltage, current, temperature and other parameters.

[0047] SOS (State of Safety) indicates the safety status of the battery, reflecting whether there are safety hazards in the battery under current conditions. It is used to assess the safety risks of the battery and ensure that the system operates within a safe range. It is assessed by monitoring battery parameters such as temperature, voltage, current, and detecting abnormal conditions such as short circuits and overheating.

[0048] SOE (State of Energy) indicates the energy state of the battery, reflecting the current remaining energy of the battery. It is used to evaluate the energy reserve of the battery under specific conditions and help optimize energy management. It is estimated by the remaining capacity and voltage of the battery.

[0049] SOR (State of Resistance) indicates the internal resistance state of the battery, reflecting the change in the internal resistance of the battery. It is used to evaluate the performance and aging of the battery and help predict the performance change of the battery by measuring the change in the internal resistance of the battery.

[0050] Optionally, the power conversion system is also used to obtain a control instruction from a host computer when the battery status indicator is in an abnormal indicator range, and isolate the battery pack in the abnormal indicator range according to the control instruction.

[0051] When the battery status indicator is SOC, the abnormal indicator interval can be an indicator interval with a smaller SOC, and its specific value can be set according to actual needs. When the SOC of a battery pack is in the abnormal indicator interval, the summary data is uploaded to the host computer through the communication unit, and the host computer processes the summary data to obtain the control instruction. The second bus is fed back to the communication unit, and the battery pack in the abnormal indicator interval is isolated through the power conversion system. In other embodiments, when the battery status indicator is the battery temperature, the corresponding control instruction can be an emergency stop instruction, which is used to cut off the power supply through the emergency stop contact in the I / O signal dry contact, or to connect to the fire protection system through the fire protection contact in the I / O signal dry contact to ensure the safety of the battery management system.

[0052] Optionally, the power conversion system further includes a power module, which is used to regulate the voltage and current from the power generation end and also used to regulate the voltage and current output to the battery pack.

[0053] In one embodiment, the power conversion system also includes a strong power part, which is divided into a DC-DC converter and a DC-AC converter. The power module is used to adjust the DC-DC converter to convert the input DC voltage into different levels of DC voltage. For example, in a photovoltaic system, the higher DC voltage generated by the solar panel is converted into a lower DC voltage suitable for battery storage or inverter input to achieve precise control of power.

[0054] In another embodiment, the power module is used to collect data such as voltage, current, temperature, etc. from the DC-DC converter and the DC-AC inverter. The collected data is processed to calculate the power state of the system (such as SOC, SOH, SOP, etc.). According to the system requirements and goals, the control algorithm (such as PID control, MPPT algorithm, island detection algorithm, etc.) is executed. The control instructions are sent to the DC-DC converter and the DC-AC inverter to achieve accurate control of power. Data is exchanged with the upper control system through a communication interface (such as Modbus, CAN, Ethernet, etc.).

[0055] Optionally, the acquisition and calculation module also includes I / O signal dry contacts, which include fire contacts, emergency stop contacts and external control contacts. The fire contacts are used to connect to the fire protection system, the emergency stop contacts are used to cut off the power supply, and the external control contacts are used to communicate with the external system and receive the status signal of the external system.

[0056] The functionality and safety of the module are enhanced through I / O signal dry contacts. These I / O signal dry contacts include fire contacts, emergency stop contacts and external control contacts, which are used to connect to the fire system, cut off the power supply and communicate with the external system respectively.

[0057] The fire contact provides a standard dry contact interface, such as a relay contact, for connecting to the fire system. When the fire system triggers an alarm, the fire contact receives a switch signal, which is recognized and processed by the acquisition and calculation module. The fire contact is connected to the fire system through a standard dry contact interface. When the fire system detects a fire or other emergency, it sends a switch signal to the fire contact. After the acquisition and calculation module detects the switch signal of the fire contact, it will immediately take corresponding safety measures, such as cutting off the power supply and sounding an alarm. The acquisition and calculation module reports the status information of the fire contact to the control system for further processing and recording.

[0058] The emergency stop contact provides a standard dry contact interface, such as a button or switch, for manually or automatically cutting off the power supply. When the emergency stop contact is triggered, a switch signal is sent to the acquisition and calculation module, and the module immediately responds and performs the corresponding operation. The emergency stop contact is connected to the acquisition and calculation module through a standard dry contact interface. When the user presses the emergency stop button or the system detects an abnormal situation, the emergency stop contact sends a switch signal. After the acquisition and calculation module detects the switch signal of the emergency stop contact, it immediately cuts off the power supply to ensure the safety of the system. The acquisition and calculation module reports the status information of the emergency stop contact to the control system for further processing and recording.

[0059] The external control contacts provide a standard dry contact interface, such as relay contacts, for communication with external systems. It can receive status signals from external systems and pass these signals to the acquisition and calculation module for processing. The external control contacts are connected to the external system through a standard dry contact interface. The external system can send status signals, such as operating status, fault status, etc. through these contacts. After the acquisition and calculation module detects the switch signal of the external control contact, it will perform corresponding processing according to the preset logic, such as adjusting system parameters, recording status information, etc. The acquisition and calculation module reports the status information of the external control contact to the control system for further processing and recording.

[0060] Optionally, the power conversion system further includes a hard-wire signal logic control module, which is used to process a hard-wire input signal and generate a hard-wire output signal, and the hard-wire output signal is used to control an external system.

[0061] In one embodiment, the external device sends hard-line input signals to the hard-line signal logic control module through the hard-line input interface. These signals can be switch signals, sensor signals, etc. The hard-line signal logic control module sends control signals to the external system through the hard-line output interface. These signals can be relay drive signals, indicator light control signals, etc.

[0062] The hard-wire signal logic control module contains an input signal processing unit, which is responsible for identifying and processing the received hard-wire input signal. The logic processing unit processes the input signal according to the preset logic rules and generates the corresponding hard-wire output signal. The output signal processing unit is responsible for sending the generated hard-wire output signal to the external system through the hard-wire output interface. The hard-wire signal logic control module can monitor the status of the hard-wire input signal and the hard-wire output signal in real time, and report this status information to the control system. The control system can perform further processing and adjustments based on the status information of the hard-wire signal logic control module to ensure the normal operation of the system.

[0063] Optionally, the power conversion system is also used to address working devices in the battery management system, where the working devices include battery packs.

[0064] In one embodiment, the working equipment in the battery management system is addressed by the power conversion system, and the working equipment includes battery packs, DC-DC converters, DC-AC inverters and other equipment. According to the preset rules, a unique address is assigned to each identified device. The assigned address information is stored for subsequent management and query. A communication interface is provided with external management systems and equipment, supporting multiple communication protocols, such as Modbus, CAN, etc.

[0065] Optionally, the communication unit is further used to send control instructions to the battery pack through the first bus, and the control instructions include charge and discharge control instructions and battery status monitoring requests.

[0066] In one embodiment, the instruction generation module generates charge and discharge control instructions according to the operation requirements of the power conversion system. These instructions may include parameters such as charging power, discharging power, charging time, and discharging time. The instruction generation module generates a battery status monitoring request, requiring the battery pack to return the current status information, such as battery voltage, current, temperature, SOC, etc. The instruction sending module sends the generated control instruction to the battery pack through the first bus interface. After the battery pack receives the control instruction, it sends a confirmation message to the communication unit through the first bus interface to ensure that the instruction is sent successfully.

[0067] The power conversion system monitors the status information of the battery pack in real time, adjusts the charge and discharge control strategy according to the status information, and reports the status information of the battery pack to the control system for further processing and adjustment.

[0068] In a second aspect, an embodiment of the present invention further provides an energy storage system, which includes the battery management system as described above.

[0069] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A battery management system, characterized in that: Including battery system and power conversion system; The battery system includes a battery pack; The power conversion system includes a collection and calculation module and an energy management module. The collection and calculation module is connected to the battery pack through a first bus. The collection and calculation module is used to collect the working data of the battery pack and calculate the battery status index. The energy management module includes a summary unit and a communication unit. The summary unit is used to summarize the battery status index to obtain summary data. The communication unit is used to upload the summary data to the host computer through a second bus.

2. The battery management system according to claim 1, characterized in that: The acquisition and calculation module includes an acquisition unit and a calculation unit. The acquisition unit is used to obtain the working data of the battery pack through the first bus, and the calculation unit is used to calculate the battery status index according to the working data.

3. The battery management system according to claim 2, characterized in that: The operating data includes at least one of the voltage, current and temperature of the battery pack; the battery status indicator includes at least one of the total voltage, total current and battery status parameter of a battery cluster, and the battery cluster includes at least one of the battery packs.

4. The battery management system according to claim 1, characterized in that: The power conversion system further includes a power module, which is used to adjust the voltage and current from the power generation end and also used to adjust the voltage and current output to the battery pack.

5. The battery management system according to claim 1, characterized in that: The acquisition and calculation module also includes I / O signal dry contacts, which include fire contacts, emergency stop contacts and external control contacts. The fire contacts are used to connect to the fire protection system, the emergency stop contacts are used to cut off the power supply, and the external control contacts are used to communicate with the external system and receive the status signal of the external system.

6. The battery management system according to claim 1, characterized in that: The power conversion system further includes a hard-wire signal logic control module, wherein the hard-wire signal logic control module is used to process a hard-wire input signal and generate a hard-wire output signal, wherein the hard-wire output signal is used to control an external system.

7. The battery management system according to claim 1, characterized in that: The power conversion system is also used to address working devices in a battery management system, and the working devices include the battery pack.

8. The battery management system according to claim 1, characterized in that: The communication unit is further used to send control instructions to the battery pack through the first bus, and the control instructions include charge and discharge control instructions and battery status monitoring requests.

9. The battery management system according to claim 1, characterized in that: The power conversion system is also used to obtain a control instruction from a host computer when the battery status indicator is in an abnormal indicator range, and isolate the battery pack in the abnormal indicator range according to the control instruction.

10. An energy storage system, characterized in that: The energy storage system includes a battery management system as described in any one of claims 1-9.

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