Communication apparatus, communication system, battery pack, power system and vehicle

Abstract

A vehicle, comprising a power system, which comprises a battery pack, wherein the battery pack comprises a communication apparatus. A communication system, comprising a communication apparatus. The communication apparatus comprises a sampling device, a first power line carrier communication device, a first power line and a second power line, wherein the first power line is used for connecting to a positive electrode of a cell assembly, and the second power line is used for connecting to a negative electrode of the cell assembly; two ends of the sampling device are used for collecting sampling information corresponding to the cell assembly; and two ends of the first power line carrier communication device are respectively connected to the first power line and the second power line, and the first power line carrier communication device is connected to the sampling device, and is used for transmitting the sampling information corresponding to the cell assembly.

Description

Communication devices, communication systems, battery packs, power systems, and automobiles

[0001] This application claims priority to Chinese Patent Application No. 202421210140.7, filed on May 29, 2024, entitled "Communication Module, Communication System, Battery Pack, Power System and Automobile", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication transmission technology, and in particular to a communication device, a communication system, a battery pack, a power system, and an automobile. Background Technology

[0003] Existing communication systems used in battery modules generally include sampling devices, which are connected to the battery module to collect sampling information from the battery module; the sampling devices communicate with bridging chips via a daisy chain. Technical issues

[0004] However, this daisy-chain communication method requires additional wiring, has low communication efficiency and reliability, and there is a certain probability of open circuits leading to communication failures. Technical solutions

[0005] This application provides a communication device, a communication system, a battery pack, a power system, and an automobile to solve the problems of low efficiency, low reliability, and high cost of communication systems on battery modules.

[0006] To achieve the objectives of this application, according to a first aspect of this application, this application provides a communication device, which includes a sampling device, a first power line carrier communication device, a first power line, and a second power line; the first power line is used to connect to the positive terminal of a battery cell assembly, and the second power line is used to connect to the negative terminal of the battery cell assembly; the two ends of the sampling device are used to collect sampling information corresponding to the battery cell assembly; the two ends of the first power line carrier communication device are respectively connected to the first power line and the second power line, and the first power line carrier communication device is connected to the sampling device for transmitting the sampling information corresponding to the battery cell assembly.

[0007] In some embodiments of this application, the communication device further includes a first power supply device;

[0008] The first power supply device is connected to the battery cell assembly and the first power line carrier communication device, and is used to convert the voltage output by the battery cell assembly to power the first power line carrier communication device.

[0009] In some embodiments of this application, the battery cell assembly includes at least two battery cells arranged in series;

[0010] The communication device also includes at least one cell sampling line, one end of which is connected to two adjacent cells, and the other end of which is connected to a sampling device.

[0011] In some embodiments of this application, the first power line carrier communication device communicates with the sampling device through an interface.

[0012] In some embodiments of this application, the interface includes an SPI interface, a UART interface, and a serial interface.

[0013] According to a second aspect of this application, this application also provides a communication system, which includes a main positive power line, a main negative power line, a second power line carrier communication device, and the aforementioned communication device; the main positive power line is used to connect to the positive terminal of a battery module, and the main negative power line is used to connect to the negative terminal of the battery module; the battery module includes one cell assembly or at least two cell assemblies connected in series; each communication device is connected to the positive and negative terminals of a cell assembly and is used to transmit sampling information corresponding to the cell assembly; the two ends of the second power line carrier communication device are respectively connected to the main positive power line and the main negative power line and are used to transmit sampling information corresponding to the battery module.

[0014] In some embodiments of this application, the battery module includes at least two battery cell assemblies arranged in series;

[0015] The communication system includes at least two communication devices, each of which is connected to the positive and negative terminals of a battery cell assembly; the communication system also includes at least two first power supply devices, each of which is connected to a battery cell assembly and a first power line carrier communication device, for converting the voltage output by the battery cell assembly to power the first power line carrier communication device; or, the communication system also includes a second power supply device, which is connected to a power supply and at least two first power line carrier communication devices, for converting the voltage output by the power supply to power the at least two first power line carrier communication devices.

[0016] In some embodiments of this application, the communication system further includes a master control device, which is connected to a second power line carrier communication device and is used to connect to external circuits.

[0017] According to a third aspect of this application, this application also provides a battery pack, the battery pack including a battery module, the battery module including at least one cell assembly, and further including the aforementioned communication device; each communication device is connected to the positive and negative terminals of a cell assembly, and is used to transmit sampling information corresponding to the cell assembly.

[0018] In some embodiments of this application, the battery module includes at least two cell assemblies connected in series; the battery pack includes at least two communication devices, each communication device being connected to the positive and negative terminals of a cell assembly; the battery pack also includes at least two first power supply devices, each first power supply device being connected to a cell assembly and a first power line carrier communication device, for converting the voltage output by the cell assembly to power the first power line carrier communication device; or, the battery pack also includes a second power supply device, the second power supply device being connected to a power supply and at least two first power line carrier communication devices, for converting the voltage output by the power supply to power the at least two first power line carrier communication devices.

[0019] According to a third aspect of this application, this application also provides a power system, which includes the aforementioned battery pack, a main positive power line, a main negative power line, and a second power line carrier communication device; the second power line carrier communication device is disposed outside the battery pack; one end of the main positive power line is connected to the positive terminal of the battery module inside the battery pack, and the other end of the main positive power line is connected to the second power line carrier communication device; one end of the main negative power line is connected to the negative terminal of the battery module inside the battery pack, and the other end of the main negative power line is connected to the second power line carrier communication device.

[0020] In some embodiments of this application, the power system further includes a main control device, which is connected to a second power line carrier communication device and is used to connect to external circuits.

[0021] According to a third aspect of this application, this application also provides an automobile that includes the aforementioned power system. Beneficial effects

[0022] According to the communication device proposed in this application, the communication device includes a sampling device, a first power line carrier communication device, a first power line, and a second power line. The first power line is used to connect to the positive terminal of the battery cell assembly, and the second power line is used to connect to the negative terminal of the battery cell assembly. The two ends of the sampling device are used to collect sampling information corresponding to the battery cell assembly. The two ends of the first power line carrier communication device are respectively connected to the first power line and the second power line. The first power line carrier communication device is connected to the sampling device and is used to transmit the sampling information corresponding to the battery cell assembly. In this embodiment, the power line carrier signal is transmitted through the power line. Compared with the daisy-chain communication method, the power line transmission path is more robust and stable, has higher reliability, stronger anti-interference ability, and relatively low cost. In addition, the power line carrier transmission speed is faster and can also effectively avoid communication failures caused by the aging of low-voltage wires in the daisy-chain method.

[0023] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0026] Figure 1 is a circuit diagram of a communication device provided in an exemplary embodiment of this application;

[0027] Figure 2 is a circuit diagram of a communication system provided in an exemplary embodiment of this application;

[0028] Figure 3 is another circuit diagram of the communication system provided in an exemplary embodiment of this application;

[0029] Figure 4 is a circuit diagram of a power system provided in an exemplary embodiment of this application;

[0030] Figure 5 is another circuit diagram of the power system provided in an exemplary embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Battery module; 11. Cell assembly; 2. Communication device; 21. Sampling device; 22. First power line carrier communication device; 23. First power line; 24. Second power line; 25. First power supply device; 26. Cell sampling line; 3. Total positive power line; 4. Total negative power line; 5. Second power line carrier communication device; 7. Main control device; 8. Battery pack.

[0032] Implementation methods of this application

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0034] This application provides a communication device 2 connected to a battery cell assembly 11. The communication device 2 connects the battery cell assembly 11 to an external circuit. It can sample and detect the battery cell assembly 11 according to instructions output by the external circuit and send the sampled information to the external circuit. The battery cell assembly 11 may include a single battery cell or at least two batteries connected in series.

[0035] In some embodiments of this application, as shown in FIG1, the communication device 2 includes a sampling device 21, a first power line carrier communication device 22, a first power line 23, and a second power line 24; the first power line 23 is used to connect to the positive terminal of the battery cell assembly 11, and the second power line 24 is used to connect to the negative terminal of the battery cell assembly 11; the two ends of the sampling device 21 are used to collect sampling information corresponding to the battery cell assembly 11; the two ends of the first power line carrier communication device 22 are respectively connected to the first power line 23 and the second power line 24, and the first power line carrier communication device 22 is connected to the sampling device 21 to transmit the sampling information corresponding to the battery cell assembly 11.

[0036] Among them, the first power line 23 is a power line connected to the positive terminal of the battery cell assembly 11, while the second power line 24 is a power line connected to the negative terminal of the battery cell assembly 11. The power lines are high-voltage lines. Compared with low-voltage lines such as daisy chains, the transmission path formed by the power lines is more robust and has higher reliability.

[0037] The sampling device 21 is used to perform information sampling and detection. In some embodiments of this application, the sampling device 21 includes a sampling chip and related peripheral circuitry, which can collect information such as voltage and temperature of the battery cell assembly 11, and can also perform battery balancing function according to received instructions. In this embodiment, the sampling device 21 can be directly connected to both ends of the battery cell assembly 11 to collect the sampling information corresponding to the battery cell assembly 11; or, the sampling device 21 can be connected to both ends of the battery cell assembly 11 through the first power line 23 and the second power line 24 to collect the sampling information corresponding to the battery cell assembly 11.

[0038] The first power line carrier communication device 22 is a communication device based on power line carrier communication technology. In some embodiments of this application, the first power line carrier communication device 22 is a power line carrier communication device connected to the first power line 23 and the second power line 24. The power line carrier communication device can utilize existing power lines to transmit analog or digital signals at high speed via carrier waves. The transmission process does not require rebuilding the network; using existing power lines for carrier communication reduces costs while ensuring communication speed. The first power line carrier communication device 22 may include, but is not limited to, coupling circuits, filtering circuits, and modulation / demodulation circuits, and can employ existing circuits that implement the corresponding functions.

[0039] In some embodiments of this application, the high-voltage sampling interface of the sampling device 21 is connected to the positive terminal of the battery cell assembly 11 via the first power line 23, and the low-voltage sampling interface of the sampling device 21 is connected to the negative terminal of the battery cell assembly 11 via the second power line 24, for collecting sampling information from the battery cell assembly 11. Correspondingly, the high-voltage carrier interface of the first power line carrier communication device 22 is connected to the positive terminal of the battery cell assembly 11 via the first power line 23, and the low-voltage carrier interface of the first power line carrier communication device 22 is connected to the negative terminal of the battery cell assembly 11 via the second power line 24. The first power line carrier communication device 22 is also connected to the battery cell assembly 11 and an external circuit. The specific communication process is as follows: the first power line carrier communication device 22 sends the instructions sent by the external circuit to the sampling device 21, so that the sampling device 21 collects the sampling information from the battery cell assembly 11 and sends the collected sampling information to the first power line carrier communication device 22; the first power line carrier communication device 22 modulates the received sampling information into a carrier signal, and then transmits the carrier signal to the external circuit via the power line to achieve the purpose of transmitting sampling information.

[0040] In this embodiment, the sampling device 21 sends the collected sampling information to the first power line carrier communication device 22. The first power line carrier communication device 22 transmits carrier signals through power lines. Compared with the daisy chain communication method, the power line transmission path is more robust and stable, has higher reliability, stronger anti-interference ability, and relatively low cost. In addition, the power line carrier has a faster transmission speed and can also effectively avoid communication failures caused by the aging of low-voltage wires in the daisy chain.

[0041] In some embodiments of this application, as shown in FIG1, the communication device 2 further includes a first power supply device 25, which is connected to the battery cell assembly 11 and the first power line carrier communication device 22, and is used to convert the voltage output by the battery cell assembly 11 to supply power to the first power line carrier communication device 22.

[0042] In some embodiments of this application, the communication device 2 further includes a first power supply device 25, which is connected to the first power line carrier communication device 22 and supplies power to the first power line carrier communication device 22 to ensure that the first power line carrier communication device 22 performs power line carrier functions. Here, the first power supply device 25 can be understood as a power supply device that supplies power to the first power line carrier communication device 22, and is used to convert the received voltage to provide the first power line carrier communication device 22 with a power supply voltage that meets its operating requirements.

[0043] In some embodiments of this application, the first power supply device 25 is connected to the battery cell assembly 11 and the first power line carrier communication device 22. It can step down the voltage at both ends of the battery cell assembly 11 and supply the first power line carrier communication device 22 with a voltage that meets its operating requirements, thereby achieving local power supply and avoiding the need to introduce an additional power supply, which helps to reduce costs.

[0044] In some embodiments of this application, as shown in FIG1, the battery cell assembly 11 includes at least two battery cells arranged in series; the communication device 2 further includes at least one battery cell sampling line 26, one end of each battery cell sampling line 26 is connected to two adjacent battery cells, and the other end of the battery cell sampling line 26 is connected to the sampling device 21.

[0045] In some embodiments of this application, when the battery cell assembly 11 includes at least two battery cells arranged in series, the communication device 2 further includes at least one battery cell sampling line 26. One end of each battery cell sampling line 26 is connected to two adjacent battery cells, and the other end of the battery cell sampling line 26 is connected to the sampling device 21. The voltage, temperature and other information corresponding to any battery cell in the battery cell assembly 11 can be collected using the first power line 23, at least one battery cell sampling line 26 and the second power line 24, so as to ensure the integrity and comprehensiveness of the collected sampling information.

[0046] In some embodiments of this application, the first power line carrier communication device 22 communicates with the sampling device 21 through an interface.

[0047] In some embodiments of this application, the first power line carrier communication device 22 and the sampling device 21 communicate through an interface without the need for additional wiring. This avoids wiring costs and communication failures caused by aging wires, thus ensuring communication efficiency and reliability.

[0048] In some embodiments of this application, the interface includes an SPI interface, a UART interface, and a serial interface.

[0049] In some embodiments of this application, the first power line carrier communication device 22 and the sampling device 21 communicate via an SPI interface, a UART interface, or a serial interface to ensure communication efficiency and reliability between them.

[0050] This application provides a communication system connected to a battery module 1, used to connect the battery module 1 and an external circuit. The system can sample and detect the battery module 1 according to instructions output by the external circuit, and send the collected sampling information corresponding to the battery module 1 to the external circuit. The battery module 1 includes at least one cell assembly 11. For example, the battery module 1 may include one cell assembly 11, or it may include at least two cell assemblies 11 connected in series.

[0051] In some embodiments of this application, as shown in Figures 2 and 3, the communication system includes a main positive power line 3, a main negative power line 4, a second power line carrier communication device 5, and the communication device 2 in the above embodiments. The main positive power line 3 is used to connect to the positive terminal of the battery module 1, and the main negative power line 4 is used to connect to the negative terminal of the battery module 1. The battery module 1 includes one cell assembly 11 or at least two cell assemblies 11 connected in series. Each communication device 2 is connected to the positive and negative terminals of a cell assembly 11 and is used to transmit sampling information corresponding to the cell assembly 11. The two ends of the second power line carrier communication device 5 are connected to the main positive power line 3 and the main negative power line 4, respectively, and are used to transmit sampling information corresponding to the battery module 1.

[0052] In some embodiments of this application, the communication system is connected to the battery module 1. When the battery module 1 includes a cell assembly 11, the positive terminal of the battery module 1 is the connection terminal corresponding to the positive terminal of the cell assembly 11 for connecting to an external circuit, and the negative terminal of the battery module 1 is the connection terminal corresponding to the negative terminal of the cell assembly 11 for connecting to an external circuit. When the battery module 1 includes at least two cell assemblies 11 connected in series, the positive terminal and the negative terminal of the battery module 1 are respectively the connection terminal corresponding to the positive terminal of the first cell assembly 11 and the connection terminal corresponding to the negative terminal of the last cell assembly 11. The total positive power line 3 is the power line connected to the positive terminal of the battery module 1, and the total negative power line 4 is the power line connected to the negative terminal of the battery module 1.

[0053] Among them, the second power line carrier communication device 5 is another communication device formed based on power line carrier communication technology; in some embodiments of this application, the second power line carrier communication device 5 is a power line carrier communication device connected to the total positive power line 3 and the total negative power line 4.

[0054] In some embodiments of this application, the second power line carrier communication device 5 and the first power line carrier communication device 22 in each communication device 2 mutually carry and modulate data, and the second power line carrier communication device 5 is also used to communicate with external circuits, receive instructions output by external circuits, and send the collected sampling information corresponding to the battery module 1 to external circuits.

[0055] In some embodiments of this application, the positive and negative terminals of the battery module 1 are connected to the main positive power line 3 and the main negative power line 4, respectively. The battery module 1 includes at least one cell assembly 11 connected in series. A first power line carrier communication device 22 is provided between the positive and negative terminals of each cell assembly 11, such that at least one first power line carrier communication device 22 is connected in series between the main positive power line 3 and the main negative power line 4, enabling carrier communication through the main positive power line 3 and the main negative power line 4. Furthermore, the two ends of a second power line carrier communication device 5 are connected to the main positive power line 3 and the main negative power line 4, respectively, and can also perform carrier communication through the main positive power line 3 and the main negative power line 4, providing a hardware basis for mutual carrier communication and data modulation / demodulation between the first power line carrier communication device 22 and the second power line carrier communication device 5. In this example, the communication system connected to the battery module 1 operates as follows:

[0056] (1) The second power line carrier communication device 5 receives the instruction from the external circuit, modulates the instruction into a first carrier signal, transmits the first carrier signal to both ends of the battery module 1 through the total positive power line 3 and the total negative power line 4, and then transmits it to the first power line carrier communication device 22 using the first power line 23 and the second power line 24 in each communication device 2.

[0057] (2) Each first power line carrier communication device 22 demodulates the first carrier signal output by the second power line carrier communication device 5 to obtain the demodulated instruction, and sends the instruction to the corresponding sampling device 21 so that the sampling device 21 can collect the sampling information corresponding to the battery cell assembly 11.

[0058] (3) The first power line carrier communication device 22 can receive the sampling information corresponding to the battery cell assembly 11 collected by the sampling device 21, modulate the sampling information into a second carrier signal, transmit the second carrier signal to the total positive power line 3 and the total negative power line 4 through the first power line 23 and the second power line 24, and then transmit it to the second power line carrier communication device 5 through the total positive power line 3 and the total negative power line 4.

[0059] (4) The second power line carrier communication device 5 demodulates the second carrier signal output by the first power line carrier communication device 22 to obtain the sampling information corresponding to the demodulated battery module 1, and sends the sampling information to the external circuit to complete the communication process with the external circuit.

[0060] In some embodiments of this application, a total positive power line 3 and a total negative power line 4 are respectively provided at both ends of the battery module 1. In the battery module 1, each cell assembly 11 is connected to a first power line carrier communication device 22 through a first power line 23 and a second power line 24, such that at least one first power line carrier communication device 22 is connected in series between the total positive power line 3 and the total negative power line 4, enabling it to mutually carrier and modulate data with a second power line carrier communication device 5 located between the total positive power line 3 and the total negative power line 4. In this embodiment, the communication system can be connected to an external circuit through a second power line carrier communication device 5 to collect and transmit the sampling information corresponding to the battery module 1, and ensure the reliability, stability and transmission speed of data transmission. Furthermore, the total positive power line 3 and the total negative power line 4 are respectively connected at both ends of the battery module 1 to achieve high and low voltage separation of the battery module 1, making it more resistant to interference and ensuring its transmission reliability.

[0061] In some embodiments of this application, the battery module 1 includes at least two battery cell assemblies 11 connected in series, and the communication system includes at least two communication devices 2, each communication device 2 being connected to the positive and negative terminals of a battery cell assembly 11; as shown in FIG2, the communication system further includes at least two first power supply devices 25, each first power supply device 25 being connected to a battery cell assembly 11 and a first power line carrier communication device 22, for converting the voltage output by the battery cell assembly 11 to power the first power line carrier communication device 22; or, as shown in FIG3, the communication system further includes a second power supply device, the second power supply device being connected to the power supply and at least two first power line carrier communication devices 22, for converting the voltage output by the power supply to power the at least two first power line carrier communication devices 22.

[0062] In some embodiments of this application, when the battery module 1 includes at least two battery cell assemblies 11 connected in series, the communication system includes at least two communication devices 2. Each communication device 2 is equipped with a first power line carrier communication device 22. When the first power line carrier communication device 22 is connected to the positive and negative terminals of a battery cell assembly 11, the communication system also includes at least two first power supply devices 25. Each first power supply device 25 is connected to a first power line carrier communication device 22 and performs voltage conversion on the voltage output from the battery cell assembly 11 connected to it, supplying power to the first power line carrier communication device 22 independently, thereby ensuring the carrier communication effect of each first power line carrier communication device 22. Here, the first power supply device 25 can be understood as a power supply device that supplies power to a first power line carrier communication device 22.

[0063] In some embodiments of this application, when the battery module 1 includes at least two battery cell assemblies 11 connected in series, the communication system includes at least two communication devices 2. Each communication device 2 is equipped with a first power line carrier communication device 22. When the first power line carrier communication device 22 is connected to the positive and negative terminals of a battery cell assembly 11, the communication system also includes a power supply and a second power supply device. The power supply here is a power source used to supply power to the first power line carrier communication device 22, and can be any one of the at least one battery cell assembly 11, or an additional power source. The second power supply device can be connected to the first power line carrier communication device 22 in the at least two communication devices 2 to supply power to the at least two first power line carrier communication devices 22, and can receive the voltage output from any battery cell assembly 11 or other external power source, perform voltage conversion on the received voltage, and supply a power voltage to the at least two first power line carrier communication devices 22 that meets their operating requirements. This method can effectively reduce the number of power supply devices, thereby reducing costs. The second power supply device here can be understood as a power supply device that supplies power to the at least two first power line carrier communication devices 22.

[0064] In some embodiments of this application, as shown in Figures 2 and 3, the communication system further includes a main control device 7, which is connected to a second power line carrier communication device 5 and is used to connect to external circuits.

[0065] In some embodiments of this application, the communication system further includes a main control device 7, which can be a microcontroller for implementing communication control. In this example, the main control device 7 communicates with an external circuit, receives instructions sent by the external circuit, and sends the instructions to a second power line carrier communication device 5. The second power line carrier communication device 5 modulates the instructions to form a carrier signal corresponding to the instructions, and transmits the carrier signal corresponding to the instructions to each first power line carrier communication device 22 via power lines. The first power line carrier communication device 22 demodulates the carrier signal corresponding to the instructions and sends the demodulated instructions to a sampling device 21 so that the sampling device 21 can collect sampling information. The first power line carrier communication device 22 modulates the collected sampling information and transmits the carrier signal corresponding to the sampling information to the second power line carrier communication device 5 via power lines. The second power line carrier communication device 5 demodulates the carrier signal corresponding to the sampling information and sends the demodulated sampling information to the main control device 7. The main control device 7 then sends the sampling information to the external circuit to complete the communication interaction process with the external circuit.

[0066] In some embodiments of this application, as shown in Figures 4 and 5, a battery pack 8 is provided. The battery pack 8 includes a battery module 1, which includes at least one cell assembly 11. It also includes a communication device 2 as described in the above embodiments. Each communication device 2 is connected to the positive and negative terminals of a cell assembly 11 and is used to transmit sampling information corresponding to the cell assembly 11.

[0067] In some embodiments of this application, the battery pack 8 includes a housing, a battery module 1 disposed within the housing, and a communication device 2 as described in the above embodiments. The battery module 1 includes a cell assembly 11 or at least two cell assemblies 11 arranged in series. Each communication device 2 is connected to the positive and negative terminals of a cell assembly 11. The communication device 2 includes a sampling device 21, a first power line carrier communication device 22, a first power line 23, and a second power line 24. The first power line 23 and the second power line 24 are respectively connected to the positive and negative terminals of the battery cell assembly 11. The two ends of the sampling device 21 are connected to the first power line 23 and the second power line 24 to collect the sampling information of the battery cell assembly 11. The two ends of the first power line carrier communication device 22 are connected to the first power line 23 and the second power line 24. The first power line carrier communication device 22 is also connected to the sampling device 21 and an external circuit. It can receive instructions output by the external circuit and send the instructions to the sampling device 21 so that the sampling device 21 can collect the sampling information of the battery cell assembly 11. The first power line carrier communication device 22 can also modulate the sampling information collected by the sampling device 21 into a carrier signal and then transmit it to the external circuit through the power line to achieve the purpose of transmitting the sampling information.

[0068] In some embodiments of this application, the battery module 1 in the battery pack 8 includes at least one cell assembly 11. The two ends of each cell assembly 11 are connected to a first power line carrier communication device 22 via power lines to communicate and transmit the sampling information of the cell assembly 11 corresponding to the two ends of the first power line carrier communication device 22. Compared with the daisy-chain communication method, the power line transmission path is more robust and stable, more reliable, stronger in anti-interference, and relatively inexpensive. In addition, the power line carrier has a faster transmission speed and can also effectively avoid communication failures caused by the aging of low-voltage wires.

[0069] In some embodiments of this application, the battery module 1 includes at least two cell assemblies 11 connected in series; the battery pack 8 includes at least two communication devices 2, each communication device 2 being connected to the positive and negative terminals of a cell assembly 11; as shown in FIG4, the battery pack 8 further includes at least two first power supply devices 25, each first power supply device 25 being connected to a cell assembly 11 and a first power line carrier communication device 22, for converting the voltage output by the cell assembly 11 to power the first power line carrier communication device 22; or, as shown in FIG5, the battery pack 8 further includes a second power supply device, the second power supply device being connected to a power supply and at least two first power line carrier communication devices 22, for converting the voltage output by the power supply to power the at least two first power line carrier communication devices 22.

[0070] In some embodiments of this application, when the battery module 1 includes at least two cell assemblies 11 connected in series, the battery pack 8 includes at least two communication devices 2. Each communication device 2 is equipped with a first power line carrier communication device 22. When the first power line carrier communication device 22 is connected to the positive and negative terminals of a cell assembly 11, the battery pack 8 also includes at least two first power supply devices 25. Each first power supply device 25 is connected to a first power line carrier communication device 22 and performs voltage conversion on the voltage output from the cell assembly 11 connected to it, supplying power to the first power line carrier communication device 22 independently, thereby ensuring the carrier communication effect of each first power line carrier communication device 22. Here, the first power supply device 25 can be understood as a power supply device that supplies power to a first power line carrier communication device 22.

[0071] In some embodiments of this application, when the battery module 1 includes at least two cell assemblies 11 arranged in series, the battery pack 8 includes at least two communication devices 2. Each communication device 2 is provided with a first power line carrier communication device 22. When the first power line carrier communication device 22 is connected to the positive and negative terminals of a cell assembly 11, the battery pack 8 also includes a power supply and a second power supply device. The power supply here is a power supply used to power the first power line carrier communication device 22, and can be any one of the at least one cell assembly 11, or an additional power supply. The second power supply device can be connected to the first power line carrier communication device 22 in the at least two communication devices 2 to supply power to the at least two first power line carrier communication devices 22. Specifically, it can receive the voltage output from any cell assembly 11 or other external power supply, perform voltage conversion on the received voltage, and supply a power voltage to the at least two first power line carrier communication devices 22 that meets their operating requirements. This method can effectively reduce the number of power supply devices, thereby reducing costs. The second power supply device here can be understood as a power supply device that supplies power to the at least two first power line carrier communication devices 22.

[0072] In some embodiments of this application, as shown in Figures 4 and 5, a power system is provided, including a battery pack 8, a main positive power line 3, a main negative power line 4, and a second power line carrier communication device 5 as described in the above embodiments; the second power line carrier communication device 5 is disposed outside the battery pack 8; one end of the main positive power line 3 is connected to the positive terminal of the battery module 1 inside the battery pack 8, and the other end of the main positive power line 3 is connected to the second power line carrier communication device 5; one end of the main negative power line 4 is connected to the negative terminal of the battery module 1 inside the battery pack 8, and the other end of the main negative power line 4 is connected to the second power line carrier communication device 5.

[0073] In some embodiments of this application, the power system includes a battery pack 8, a second power line carrier communication device 5, a total positive power line 3, and a total negative power line 4. The battery pack 8 includes a housing and battery modules 1 and a communication device 2 disposed within the housing. The battery module 1 includes at least one cell assembly 11, which may include one cell assembly 11 or at least two cell assemblies 11 connected in series. Each communication device 2 is connected to both ends of a cell assembly 11 for transmitting sampling information corresponding to the cell assembly 11; that is, the first power line carrier communication device 22 within the communication device 2 is disposed within the housing of the battery pack 8. The second power line carrier communication device 5 is disposed outside the housing of the battery pack 8.

[0074] In this embodiment, one end of the main positive power line 3 extends into the battery pack 8 and is connected to the positive terminal of the battery module 1 inside the battery pack 8. The other end of the main positive power line 3 extends out of the battery pack 8 and is used to connect to the second power line carrier communication device 5 disposed outside the battery pack 8. Correspondingly, one end of the main negative power line 4 extends into the battery pack 8 and is connected to the negative terminal of the battery module 1 inside the battery pack 8. The other end of the main negative power line 4 extends out of the battery pack 8 and is used to connect to the second power line carrier communication device 5 disposed outside the battery pack 8. Since each cell assembly 11 in the battery module 1 is provided with a first power line carrier communication device 22 at both ends, at least one first power line carrier communication device 22 is connected in series between the total positive power line 3 and the total negative power line 4, that is, a transmission path is formed between the total positive power line 3 - at least one communication device 2 (first power line 23 - first power line carrier communication device 22 - second power line 24) - total negative power line 4, so that at least one first power line carrier communication device 22 in the battery pack 8 can communicate with a second power line carrier communication device 5 located outside the battery pack 8 through a total positive power line 3 and a total negative power line 4, so as to ensure communication reliability, stability and transmission speed.

[0075] In some embodiments of this application, as shown in Figures 4 and 5, the power system further includes a main control device 7, which is connected to a second power line carrier communication device 5 and is used to connect to external circuits.

[0076] As an example, the power system also includes a main control device 7, which can be a microcontroller used for communication control. In this example, the main control device 7 communicates with external circuits, receives instructions sent by external circuits, and sends the instructions to the second power line carrier communication device 5. The second power line carrier communication device 5 modulates the instructions to form a carrier signal corresponding to the instructions, and transmits the carrier signal corresponding to the instructions through power lines to each first power line carrier communication device 22. The first power line carrier communication device 22 demodulates the carrier signal corresponding to the instructions and sends the demodulated instructions to the sampling device 21 so that the sampling device 21 can collect sampling information. The first power line carrier communication device 22 modulates the collected sampling information and transmits the carrier signal corresponding to the sampling information through power lines to the second power line carrier communication device 5. The second power line carrier communication device 5 demodulates the carrier signal corresponding to the sampling information and sends the demodulated sampling information to the main control device 7. The main control device 7 then sends the sampling information to the external circuits to complete the communication interaction process with the external circuits.

[0077] This application provides an automobile, including the power system described in the above embodiments.

[0078] In some embodiments of this application, the power system can transmit data through a transmission path formed by power lines and power line carrier communication devices, which can effectively ensure the reliability, stability and transmission speed of the communication process.

[0079] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0080] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0081] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0082] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A communication device (2), wherein, The communication device (2) comprises: a sampling device (21) having two ends for collecting sampling information of a battery cell assembly (11); a first power line carrier communication device (22) connected to the sampling device (21) for transmitting the sampling information of the battery cell assembly (11); a first power line (23) for connecting a positive electrode of the battery cell assembly (11); and a second power line (24) for connecting a negative electrode of the battery cell assembly (11); wherein the two ends of the first power line carrier communication device (22) are connected to the first power line (23) and the second power line (24) respectively.

2. The communication device (2) according to claim 1, wherein, The communication device (2) further comprises a first power supply device (25); the first power supply device (25) is connected to the battery cell assembly (11) and the first power line carrier communication device (22) for converting the voltage output by the battery cell assembly (11) to power the first power line carrier communication device (22).

3. The communication apparatus (2) according to claim 1 or 2, wherein The battery cell assembly (11) comprises at least two battery cells connected in series. The communication device (2) further comprises at least one battery cell sampling line (26), one end of each battery cell sampling line (26) being connected to two adjacent battery cells, and the other end of the battery cell sampling line (26) being connected to the sampling device (21).

4. The communication apparatus (2) according to any one of claims 1 to 3, wherein The first power line carrier communication device (22) communicates with the sampling device (21) through an interface.

5. The communication apparatus (2) according to claim 4, wherein The interface comprises an SPI interface, a UART interface and a serial interface.

6. A communication system wherein, The communication device (2) comprises: a total positive power line (3) for connecting a positive electrode connection end of a battery module (1), the battery module (1) comprising one battery cell assembly (11) or at least two battery cell assemblies (11) connected in series; a total negative power line (4) for connecting a negative electrode connection end of the battery module (1); a second power line carrier communication device (5) having two ends connected to the total positive power line (3) and the total negative power line (4) respectively for transmitting sampling information of the battery module (1); and The communication device (2) according to any one of claims 1-5, each of the communication devices (2) being connected to a positive electrode and a negative electrode of a battery cell assembly (11) for transmitting sampling information of the battery cell assembly (11). The battery module (1) comprises at least two battery cell assemblies (11) connected in series; 7. The communication system of claim 6, wherein, The communication system comprises at least two communication devices (2), each of the communication devices (2) being connected to a positive electrode and a negative electrode of a battery cell assembly (11); The communication system further comprises: at least two first power supply devices (25), each of the first power supply devices (25) being connected to a battery cell assembly (11) and a first power line carrier communication device (22) for converting the voltage output by the battery cell assembly (11) to power the first power line carrier communication device (22); or ​ A second power supply device connected with a power supply and at least two first power line carrier communication devices (22) for converting the voltage output by the power supply to power the at least two first power line carrier communication devices (22).

8. The communication system of claim 6 or 7, wherein, The communication system further comprises a master device (7) connected with the second power line carrier communication device (5) and used for connecting an external circuit.

9. A battery pack (8), wherein The battery pack (8) comprises: a battery module (1) comprising at least one battery cell assembly (11); and The communication device (2) according to any one of claims 1-5; Each of the communication devices (2) is connected with the positive and negative electrodes of one of the battery cell assemblies (11) and used for transmitting the sampling information of the corresponding battery cell assembly (11).

10. The battery pack (8) according to claim 9, wherein The battery module (1) comprises at least two battery cell assemblies (11) connected in series. The battery pack (8) comprises at least two communication devices (2), each of which is connected with the positive and negative electrodes of one of the battery cell assemblies (11). The battery pack (8) further comprises: at least two first power supply devices (25), each of which is connected with one of the battery cell assemblies (11) and one of the first power line carrier communication devices (22) and used for converting the voltage output by the battery cell assembly (11) to power the first power line carrier communication device (22); or a second power supply device connected with a power supply and at least two first power line carrier communication devices (22) for converting the voltage output by the power supply to power the at least two first power line carrier communication devices (22).

11. A power system, wherein, The battery pack (8) according to any one of claims 9-10; a second power line carrier communication device (5) arranged outside the battery pack (8); a total positive power line (3) having one end connected with the positive electrode connection end of the battery module (1) in the battery pack (8) and the other end connected with the second power line carrier communication device (5); and a total negative power line (4) having one end connected with the negative electrode connection end of the battery module (1) in the battery pack (8) and the other end connected with the second power line carrier communication device (5). The power system further comprises a master device (7) connected with the second power line carrier communication device (5) and used for connecting an external circuit. The power system according to any one of claims 11-12.

12. The power system of claim 11, wherein, The power system according to any one of claims 11-12.

13. An automobile, wherein, ​

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