Communication system structure of energy storage battery management system

Abstract

The invention relates to the technical field of battery communication, in particular to a communication system structure of an energy storage battery management system, which comprises a battery management controller, a communication module and a battery cluster, the battery management controller is in communication connection with the communication module through a CAN bus; the battery cluster comprises a plurality of battery packs, the battery packs are connected in series through a daisy chain, and at least one battery pack is in communication connection with the communication module through the daisy chain. The battery management controller and the communication module are in CAN communication connection, so that the anti-interference performance of the system can be improved; and daisy chain connection is adopted between the communication module and the battery packs as well as between the battery packs, so that the system complexity and the system cost can be reduced.

Description

Technical Field

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

[0002] In recent years, energy storage technologies at home and abroad have developed rapidly. The containerized battery energy storage system has the advantages of high capacity, high reliability, strong flexibility, no pollution, and easy installation, and has broad application prospects in the power grid system, which is the development direction of future energy storage. The Battery Management System (BMS) plays an important role in the daily management and control of energy storage battery packs, and can achieve fair distribution of batteries, maintain battery health, protect battery safety, improve battery efficiency, and provide a strong guarantee for the stable and efficient operation of the energy storage system.

[0003] A known communication connection method for a containerized energy storage battery management system by the inventors is to adopt a distributed structure, that is, the battery cell signal acquisition is separated from the Battery Management Controller (BMC). The BMC is usually installed in the high-voltage box, and the Cell Management Controller (CMC) is installed in the battery cluster. The distance between the high-voltage box and the battery cluster is relatively far. Therefore, the communication quality between the BMC and the CMC is crucial. Among them, there are mainly two ways of communication between the current BMC and CMC: First, adopt CAN communication, which has high anti-interference; Second, adopt daisy-chain communication, which has the advantage of low cost. In the prior art, the following two methods are adopted for communication between the BMC and the CMC: One is to set a CAN and daisy-chain conversion module on each single battery management controller, but this method will greatly increase the system cost and requires low-voltage power supply, increasing the system complexity; The other is that the CMCs of the entire battery cluster are connected in series in a daisy-chain manner, but this method will result in a large number of communication nodes, long communication distance, poor anti-interference, resulting in an increased communication error rate of the system or even unable to communicate.

[0004] In summary, the prior art has the problem of being unable to balance the anti-interference of the battery management system communication and reducing the system complexity. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a communication system structure of an energy storage battery management system, which can solve the problem of being unable to balance the anti-interference of the battery management system communication and reducing the system complexity.

[0006] To achieve the above and other related objectives, the present invention provides a communication system structure for an energy storage battery management system, including: a battery management controller, a communication module, and a battery cluster;

[0007] The battery management controller is communicatively connected to the communication module via a CAN bus;

[0008] The battery cluster includes a plurality of battery packs, and the battery packs are connected in a daisy-chain series manner. At least one of the battery packs is communicatively connected to the communication module via a daisy chain.

[0009] In a specific embodiment of the present invention, each battery pack includes a battery module and a battery cell management controller, and the battery module is connected to the battery cell management controller.

[0010] In a specific embodiment of the present invention, the communication module is communicatively connected to any one of the battery packs in the battery cluster via a daisy chain.

[0011] In a specific embodiment of the present invention, the communication module is communicatively connected to the battery cell management controller in the battery pack via a daisy chain.

[0012] In a specific embodiment of the present invention, the battery cell management controller includes a plurality of battery sampling chips, and the battery sampling chips are connected in a daisy-chain series manner.

[0013] In a specific embodiment of the present invention, the battery sampling chips are respectively connected to the battery module.

[0014] In a specific embodiment of the present invention, the communication module is communicatively connected to any one of the battery sampling chips in the battery cell management controller via a daisy chain.

[0015] In a specific embodiment of the present invention, the communication module includes a CAN signal parsing chip and a daisy-chain conversion chip;

[0016] The battery management controller is connected to the CAN signal parsing chip via a CAN bus, the CAN signal parsing chip is connected to the daisy-chain conversion chip via an asynchronous serial port, and the daisy-chain conversion chip is connected to the battery sampling chip via a daisy-chain topology.

[0017] In a specific embodiment of the present invention, the communication module includes a CAN signal parsing chip, a main control chip, and a daisy-chain conversion chip;

[0018] The battery management controller is connected to the CAN signal parsing chip via a CAN bus. The CAN signal parsing chip is connected to the main control chip via an asynchronous serial port. The main control chip is connected to the daisy chain conversion chip via SPI communication. The daisy chain conversion chip and the battery sampling chip are connected via a daisy chain topology.

[0019] In a specific embodiment of the present invention, the battery management controller is disposed in the high-voltage box.

[0020] In the present invention, the battery management controller and the communication module are connected by CAN communication, improving the anti-interference ability of the system. Between the communication module and the battery pack, and between the battery packs, daisy chain connections are used, reducing the system complexity and system cost.

[0021] The communication module is connected to at least one battery pack, enabling flexible adjustment of the number of communication modules used. In addition, the communication module is connected to at least one battery pack and communicates with at least one battery sampling chip, enabling flexible adjustment of the installation position of the communication module and the flexibility of the connection position.

[0022] The mutual conversion between CAN signals and daisy chain signals can be achieved through the CAN signal parsing chip and the daisy chain conversion chip. When the MCU is not involved, the application cost is reduced. When combined with the MCU, the solution is universal and can be adapted to different slave board battery cell acquisition controllers.

[0023] Therefore, through the CAN communication connection between the battery management controller and the communication module in the present invention, combined with the daisy chain connections between the communication module and the battery pack, and between the battery packs, the problem of being unable to balance the communication anti-interference ability of the battery management system and reducing the system complexity can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a partial structural schematic diagram of the communication system structure of the energy storage battery management system provided by the present invention;

[0025] Figure 2 It is a structural schematic diagram of the battery pack provided by the present invention;

[0026] Figure 3 It is a structural schematic diagram of the battery cell management controller in the battery pack provided by the present invention;

[0027] Figure 4 It is an overall structural schematic diagram of the communication system structure of the energy storage battery management system provided by the present invention;

[0028] Figure 5 It is a structural schematic diagram of a communication module in the communication system structure provided by the present invention;

[0029] Figure 6 Another structural schematic diagram of the communication module in the communication system structure provided by the present invention;

[0030] In the figure: 1, battery management controller; 2, communication module; 3, battery cluster; 4, high-voltage box; 5, battery pack; 6, battery cell management controller; 7, battery module; 8, battery sampling chip; 9, CAN signal parsing chip; 10, daisy-chain conversion chip; 11, main control chip. Specific embodiments

[0031] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0032] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0033] In order to solve the problem that it is impossible to balance the anti-interference performance of the battery management system communication and reduce the system complexity in the prior art, the present invention proposes a communication system structure for an energy storage battery management system. Among them, the battery management controller and the communication module are connected by CAN communication, which improves the anti-interference performance of the system; between the communication module and the battery pack, and between the battery packs, daisy-chain connections are used, which reduces the system complexity and system cost.

[0034] Refer to Figure 1 As shown, the present invention proposes a communication system structure for an energy storage battery management system. It includes a battery management controller 1, a communication module 2, and a battery cluster 3.

[0035] The battery management controller 1 is communicatively connected to the communication module 2 through a CAN bus; the communication module 2 is connected to the battery cluster 3 through a daisy-chain. The battery cluster includes a plurality of battery packs, and the battery packs are connected in series in a daisy-chain manner, and at least one battery pack is communicatively connected to the communication module through a daisy-chain.

[0036] The battery management controller 1 and the communication module 2 are connected by CAN communication, which avoids the poor anti-interference performance caused by the long communication distance between the high-voltage box 4 and the battery pack 5, and improves the anti-interference performance of the system; between the communication module 2 and the battery pack 5, and between the communication module 2 and the battery pack 5, daisy-chain connection is adopted, which realizes the reduction of system complexity and system cost.

[0037] The battery management controller 1 is arranged in the high-voltage box 4. The high-voltage box is used to distribute the high-voltage electricity of the battery to high-voltage electrical equipment such as the motor controller, drive motor, electric air-conditioning compressor, and DC / DC of the vehicle, and at the same time distribute the high-voltage charging current of the AC and DC charging interfaces to the battery; it can realize the management of the vehicle's high-voltage power distribution, the separate control of each output, the management of high-voltage safety, has over-current, over-voltage, and over-temperature protection functions, and at the same time has CAN communication function to exchange data in real time.

[0038] In addition to being connected to the battery cluster through the communication module 2, the battery management controller 1 also communicates with the vehicle controller of the electric vehicle through the CAN bus. The battery management controller 1 can report the state parameters of the battery pack 5 to the vehicle controller of the electric vehicle, and receive the instructions of the vehicle controller, and determine the power output according to the needs of the vehicle; in addition, the battery management controller 1 can also monitor the operating state of the battery pack 5 in the battery cluster 3 through the battery cell management controller 6 to protect the battery pack 5 from being damaged by abnormal operating states such as over-discharge and over-heat; and the battery management controller 1 can also interact with the charger during the charging process, manage the charging parameters, and monitor the normal completion of the charging process.

[0039] The battery cluster 3 includes a plurality of battery packs 5. The battery packs 5 are connected in series in a daisy-chain manner. The battery packs can have the same voltage and capacity, and are combined to form a battery cluster. A battery cluster refers to a high-power battery system composed of a plurality of battery packs connected in series.

[0040] At least one of the battery packs 5 is communicatively connected to the communication module 2 through a daisy chain, that is, the communication module 2 can be communicatively connected to any one of the battery packs 5 in the battery cluster 3 through a daisy chain.

[0041] By communicatively connecting the communication module 2 with at least one battery pack 5 through a daisy chain, the flexible adjustment of the number of communication modules 2 used is realized; by connecting the communication module 2 to any one of the battery packs 5, the flexibility of the connection position of the communication module 2 is realized.

[0042] Specifically, as Figure 1 shown, the communication module 2 is communicatively connected to the first battery pack 5 in the battery cluster 3 through a daisy chain. Of course, the communication module 2 can be communicatively connected to the first battery pack 5 and the last battery pack 5 in the battery cluster 3 through a daisy chain.

[0043] Refer to Figure 2 As shown, it is a schematic structural diagram of the battery pack 5. The battery pack 5 includes a battery module 7 and a battery cell management controller 6, and the battery module 7 is connected to the battery cell management controller 6. The communication module 2 is connected to any one of the battery packs 5 in the battery cluster 3 through daisy-chain communication, which means that the communication module 2 is connected to the battery cell management controller 6 in this battery pack 5 through daisy-chain communication, and communication isolation is provided between the communication module 2 and other battery cell management controllers 6.

[0044] In the embodiment of the present invention, each battery module 7 includes a group of battery cells, and multiple battery cells are connected in series and in parallel. The battery cells can convert chemical energy into electrical energy to provide electrical energy for the whole vehicle; the series connection of the battery cells increases the voltage of the battery module 7 to meet the high-voltage power consumption requirements, and the parallel connection of the battery cells increases the capacity of the battery module 7. When multiple battery cells in the battery module 7 are connected in series and stacked, the voltage of the battery module 7 can be increased, for example, an output voltage of 800V or even 1500V can be achieved.

[0045] The battery management controller 1 is connected to the communication module 2 through a CAN bus, and the communication module 2 is connected to the battery cluster 3 through a daisy chain, enabling signal transmission with the battery cell management controller 6 to control each battery cell management controller 6. The battery cell management controller 6 is connected to the battery module 7, enabling the maintenance of the state of each battery unit in the battery module 7, monitoring the state of the battery, and preventing overcharging and over-discharging of the battery.

[0046] Refer to Figure 3 As shown, it is a schematic structural diagram of the battery cell management controller 6 in the battery pack 5. Among them, the battery cell management controller 6 includes multiple battery sampling chips 8, and the battery sampling chips 8 are connected in series in a daisy-chain manner, and the battery sampling chips 8 are respectively connected to the battery module 7. The communication module 2 is connected to the battery cell management controller 6 through daisy-chain communication, which means that the communication module 2 is connected to the battery sampling chip 8 through daisy-chain communication.

[0047] Specifically, the communication module 2 is connected to at least one battery sampling chip 8 in the battery cell management controller 6, that is, the communication module 2 can be connected to any one of the battery sampling chips 8 in the battery cell management controller 6 through daisy-chain communication.

[0048] The communication module 2 realizes flexible adjustment of the number of communication modules 2 used by connecting to at least one battery sampling chip 8; the communication module 2 is connected to any one of the battery sampling chips 8, realizing the flexibility of the connection position of the communication module 2.

[0049] In an embodiment of the present invention, the battery sampling chip 8 may be an AFE (Analog Front End) chip. The battery module 7 is connected to the AFE chip, and the AFE chip is used to monitor and protect the battery module 7. Specifically, the AFE chip can collect various signals generated during the charging and discharging processes of the battery module 7, such as voltage, current, temperature, etc., and process and analyze the collected signals, thereby realizing the monitoring, protection, and balancing management of the battery module 7.

[0050] Figure 4 It is a schematic diagram of the overall structure of the communication system structure of the energy storage battery management system in a specific embodiment. As Figure 4 shown, the battery management controller 1 is arranged in the high-voltage box 4, and the high-voltage box 4 communicates with the communication module 2 through the CAN bus; the battery cluster 3 includes several battery packs 5, and each battery pack 5 includes a battery cell management controller 6 and a battery module 7. The battery cell management controller 6 includes several battery sampling chips 8; among them, the communication module 2 is communicatively connected to the battery cell management controller 6 in the battery pack 5 through a daisy chain, and the communication module 2 is connected to the battery sampling chip 8 in the battery cell management controller 6 through a daisy chain. The battery sampling chips 8 and the battery packs 5 are connected in series in a daisy chain manner, and the battery cell management controller 6 is connected to the battery module 7.

[0051] Refer to Figure 4 shown, the communication module 2 is connected to the battery cell management controller 6 in the first battery pack 5 in the battery cluster 3 through a daisy chain, and is connected to the first battery sampling chip 8 in the battery cell management controller 6 through a daisy chain.

[0052] Refer to Figure 5 shown, it is a schematic diagram of a structure of the communication module 2 in the communication system structure. The communication module 2 includes a CAN signal parsing chip 9 and a daisy chain conversion chip 10; the battery management controller 1 is connected to the CAN signal parsing chip 9 through the CAN bus, the CAN signal parsing chip 9 is connected to the daisy chain conversion chip 10 through an asynchronous serial port, and the daisy chain conversion chip 10 is connected to the battery sampling chip 8 through a daisy chain topology.

[0053] Specifically, when the battery management controller 1 communicates with the battery sampling chip 8 in the battery pack 5, the battery management controller 1 on the main board sends a signal instruction to the CAN bus. After the battery cell management controller 6 on the slave board detects the signal on the CAN bus, the CAN signal parsing chip 9 processes the signal on the CAN bus and sends it to the daisy chain conversion chip 10, and the daisy chain conversion chip 10 converts the processed signal into a daisy chain signal recognizable by the battery sampling chip 8.

[0054] In the embodiment of the present invention, the mutual conversion between the CAN signal and the daisy-chain signal is realized through the CAN signal parsing chip 9 and the daisy-chain conversion chip 10, which reduces the application cost when the MCU is not involved.

[0055] Refer to Figure 6 As shown, it is another schematic structural diagram of the communication module 2 in the communication system structure. The communication module 2 includes a CAN signal parsing chip 9, a main control chip 11, and a daisy-chain conversion chip 10; the battery management controller 1 is connected to the CAN signal parsing chip 9 through a CAN bus, the CAN signal parsing chip 9 is connected to the main control chip 11 through an asynchronous serial port, the main control chip 11 is connected to the daisy-chain conversion chip 10 through SPI communication, and the daisy-chain conversion chip 10 is connected to the battery sampling chip 8 through a daisy-chain topology.

[0056] Specifically, when the battery management controller 1 on the main board communicates with the battery sampling chip 8 in the battery pack 5, the battery management controller 1 on the main board sends a signal instruction to the CAN bus. After the battery cell management controller 6 on the slave board detects the signal on the CAN bus, the CAN signal parsing chip 9 processes the signal on the CAN bus and sends it to the main control chip 11. The main control chip 11 converts the processed signal into an SPI signal and sends it to the daisy-chain conversion chip 10, and the daisy-chain conversion chip 10 converts the SPI signal into a daisy-chain signal recognizable by the battery sampling chip 8.

[0057] In the embodiment of the present invention, the mutual conversion between the CAN signal and the daisy-chain signal is achieved by combining the CAN signal parsing chip 9 and the daisy-chain conversion chip 10 with the participation of the MCU, making the solution universal and adaptable to different slave board battery cell acquisition controllers.

[0058] The main function of the CAN signal parsing chip 9 is to convert the upper-layer data into physical layer signals and transmit them through the CAN bus. The CAN signal parsing chip 9 is responsible for receiving and sending CAN signals and encoding and decoding the physical layer signals. The CAN signal parsing chip 9 can process the differential signals on the CAN bus to ensure the reliable transmission of data; it can also ensure the accurate reception of data by performing bit timing and sampling on the data.

[0059] The daisy chain uses differential signal communication, and the daisy-chain conversion chip 10 is used to convert SPI or UART signals into pulse phase modulation signals (PPM). Specifically, it converts 1 and 0 of the SPI or UART signal into sine wave signals with opposite phases, or vice versa.

[0060] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

[0061] In the description herein, numerous specific details are provided, such as examples of components and / or methods, to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or by other devices, systems, components, methods, parts, materials, articles, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0062] Throughout the specification, reference to "an embodiment", "embodiments", or "specific embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least one embodiment of the present invention and not necessarily in all embodiments. Thus, appearances of the phrases "in an embodiment", "in embodiments", or "in specific embodiments" in various places throughout the specification are not necessarily referring to the same embodiment. Additionally, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined in any suitable manner with one or more other embodiments. It is to be understood that other variations and modifications of the embodiments of the invention described and shown herein may be made in accordance with the teachings herein and will be considered part of the spirit and scope of the present invention.

[0063] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separated or more integrated manner, or even removed in some cases because they are inoperable or provided because they may be useful for a particular application.

[0064] Further, unless otherwise expressly specified, any of the marker arrows in the figures should be considered merely exemplary and not limiting. Additionally, unless otherwise specified, the term "or" as used herein is generally intended to mean "and / or". Where the term is anticipated to be unclear due to the ability to provide separation or combination, the combination of components or steps will also be considered to have been specified.

[0065] As used in the description herein and throughout the claims below, unless otherwise specified, "a", "an", and "the" include plural references. Also, as used in the description herein and throughout the claims below, unless otherwise specified, the meaning of "in" includes "in" and "on".

[0066] The foregoing description of the embodiments shown in the present invention (including that set forth in the Abstract of the Disclosure) is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. While specific embodiments of the invention and examples of the invention have been described herein for illustrative purposes only, various equivalent modifications will be apparent to and can be made by those of ordinary skill in the art in the spirit and scope of the invention. As noted, these modifications can be made to the invention in accordance with the foregoing description of the embodiments of the invention and these modifications would be within the spirit and scope of the invention.

[0067] The systems and methods have been described generally herein to facilitate an understanding of the details of the invention. Additionally, various specific details have been given to provide a general understanding of embodiments of the invention. However, one of ordinary skill in the relevant art will recognize that the embodiments of the invention can be practiced without one or more of the specific details, or with other devices, systems, components, methods, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of the embodiments of the invention.

[0068] Accordingly, while the invention has been described herein with reference to its specific embodiments, modifications, various changes and substitutions are also within the above disclosure, and it should be understood that in some instances, some features of the invention may be employed without a corresponding use of other features without departing from the scope and spirit of the claimed invention. Accordingly, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terms and / or the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the invention will be determined only by the appended claims.

Claims

1. A communication system structure of an energy storage battery management system, It is characterized in that Including battery management controller, communication module and battery cluster; The battery management controller is connected to the communication module via a CAN bus communication; The battery cluster includes a plurality of battery packs, each of which is connected in series in a daisy chain manner, and at least one of the battery packs is connected to the communication module via daisy chain communication.

2. The communication system structure of the energy storage battery management system according to claim 1, It is characterized in that Each of the battery packs includes a battery module and a battery cell management controller, and the battery module is connected to the battery cell management controller.

3. The communication system structure of the energy storage battery management system according to claim 1, It is characterized in that The communication module is connected to any battery pack in the battery cluster via daisy chain communication.

4. The communication system structure of the energy storage battery management system according to claim 1, It is characterized in that The communication module is connected to the battery cell management controller in the battery pack via daisy chain communication.

5. The communication system structure of the energy storage battery management system according to claim 1, It is characterized in that The battery cell management controller includes a plurality of battery sampling chips, and the battery sampling chips are connected in series in a daisy chain manner.

6. The communication system structure of the energy storage battery management system according to claim 5, It is characterized in that The battery sampling chips are connected to the battery modules respectively.

7. The communication system structure of the energy storage battery management system according to claim 5, It is characterized in that The communication module is connected to any battery sampling chip in the battery cell management controller via daisy chain communication.

8. The communication system structure of the energy storage battery management system according to claim 5, It is characterized in that The communication module includes a CAN signal analysis chip and a daisy chain conversion chip; The battery management controller is connected to the CAN signal analysis chip via a CAN bus, the CAN signal analysis chip is connected to the daisy chain conversion chip via an asynchronous serial port, and the daisy chain conversion chip is connected to the battery sampling chip via a daisy chain topology.

9. The communication system structure of the energy storage battery management system according to claim 5, It is characterized in that The communication module includes a CAN signal analysis chip, a main control chip and a daisy chain conversion chip; The battery management controller is connected to the CAN signal analysis chip via a CAN bus, the CAN signal analysis chip is connected to the main control chip via an asynchronous serial port, the main control chip is connected to the daisy chain conversion chip via SPI communication, and the daisy chain conversion chip is connected to the battery sampling chip via a daisy chain topology.

10. The communication system structure of the energy storage battery management system according to claim 1, It is characterized in that The battery management controller is arranged in the high voltage box.

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