Multi-section signal acquisition assembly and battery management system

Abstract

A multi-section type signal acquisition assembly is used for acquiring signals of battery cells and comprises a plurality of circuit boards and a plurality of wireless transmission modules. Each wireless transmission module is arranged on one circuit board, every two adjacent wireless transmission modules have a wireless communication function, and each wireless transmission module comprises an analog front end, a wireless communication chip and a power supply chip. And the analog front end is connected with the circuit board and is used for converting the signal of the battery cell to obtain a secondary signal. And the wireless communication chip is connected with the analog front end and is used for wirelessly receiving and transmitting the secondary signal. The power supply chip is connected with the analog front end and the wireless communication chip. The power supply chip is used for being connected with the battery cell and providing electric energy for the analog front end and the wireless communication chip. The multi-section signal acquisition assembly provided by the utility model has the advantage of simplicity and convenience in installation and maintenance. In addition, the utility model also provides a battery management system.

Description

Technical Field

[0001] The present application relates to the field of battery system management, and in particular to a multi-segment signal acquisition component and a battery management system. Background Art

[0002] With the rapid development of the electric vehicle industry, battery management system (BMS) has become a key technology to ensure the safe and efficient operation of electric vehicles. Among them, signal acquisition of battery cells through flexible printed circuit boards (FPCs) is a common implementation method. The FPC signal acquisition board is mainly used to measure the voltage, current and temperature of battery cells to achieve real-time monitoring and management of battery status. However, the FPC signal acquisition board used in existing automotive BMS systems has several significant technical limitations and challenges.

[0003] First, the current FPC signal acquisition board is generally longer than 1.8 meters. This design not only increases the complexity of the circuit board manufacturing process, but also requires at least two folding and straightening operations to be correctly installed when it is finally assembled to the battery pack. This process is not only cumbersome, but also very easy to produce cracks at the bend of the FPC, which affects the accurate acquisition of the signal and endangers the safety of the battery cell signal sampling. Secondly, due to the length of the FPC signal acquisition board, the information transmission path detected from the battery cell is too long, which will introduce a delay, which affects the ability of the control device to make a quick and accurate judgment on the battery status. In the case of partial cell failure, the overly long FPC signal acquisition board is also not conducive to the disassembly and replacement of the battery module, affecting the maintenance efficiency and cost of the system. In addition, when components on the FPC detection board, such as NTC (negative temperature coefficient thermistor) and fuses, are damaged, the entire long board needs to be replaced, which significantly increases the maintenance cost. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a multi-segment signal acquisition component.

[0005] In addition, the present application also provides a battery management system.

[0006] A multi-segment signal acquisition component for acquiring signals of a battery cell, comprising:

[0007] Multiple circuit boards;

[0008] A plurality of wireless transmission modules, each of which is disposed on one of the circuit boards, each of which has a wireless communication function between two adjacent wireless transmission modules, and each of which includes:

[0009] An analog front end, connected to the circuit board, for converting the signal of the battery cell to obtain a secondary signal;

[0010] A wireless communication chip connected to the analog front end and used for wirelessly transmitting and receiving the secondary signal; and a power chip connected to the analog front end and the wireless communication chip, wherein the power chip is used to connect the battery cell and provide power to the analog front end and the wireless communication chip.

[0011] In some possible implementations, a plurality of the circuit boards are arranged side by side, and each of the circuit boards includes a main body, a connecting portion connected to the main body, and a temperature measuring portion, the connecting portion is used to connect the battery cells, and the temperature measuring portion is used to connect the battery cells.

[0012] In some possible implementations, the main body includes a soft board, the connecting portion includes a nickel sheet, and the temperature measuring portion includes a negative temperature coefficient thermistor.

[0013] In some possible implementations, each of the circuit boards further includes a fuse, and the fuse is connected to the connecting portion and the main body.

[0014] In some possible implementations, the length of the main body is less than 500 mm.

[0015] In some possible implementations, each of the wireless transmission modules further includes a first relay transmitting antenna, the first relay transmitting antenna is connected to the wireless communication chip, and the first relay transmitting antenna is used to amplify the secondary signal.

[0016] In some possible implementations, the analog front end is connected to the wireless communication chip via a serial peripheral device interface.

[0017] In some possible implementations, the wireless transmission module is connected to the circuit board via a single in-line package.

[0018] A battery cell signal acquisition system comprises the multi-segment signal acquisition component as described above and a mainboard receiving chip.

[0019] In some possible implementations, a second relay transmitting antenna is further included, and the mainboard receiving chip is connected to the second relay transmitting antenna.

[0020] The multi-segment signal acquisition assembly provided by the present application is provided with a wireless transmission module on each circuit board, so that the signal transmission between each two adjacent circuit boards does not require physical connection, folding and straightening, thereby simplifying the production process of the FPC signal acquisition board, reducing the complexity of installation, and thus helping to improve installation efficiency and reduce potential damage risks. In addition, if a circuit board is damaged, only the damaged circuit board can be replaced instead of the entire FPC signal acquisition board, which is conducive to reducing maintenance costs. In addition, if the battery cell on the battery module fails, the battery cell of the relevant part can be directly replaced without affecting other normal working batteries, which is conducive to disassembly and maintenance. In addition, a wireless transmission module is provided on each circuit board, so that the collected battery cell parameters (such as current, voltage, temperature, pressure) can be directly, synchronously, and losslessly transmitted to the mainboard receiving chip of the BMS. Such a configuration reduces the delay of the signal on the transmission path, ensures the synchronization, safety and reliability of the signal transmission, and is conducive to improving the signal acquisition accuracy and response speed of the entire battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a multi-segment signal acquisition component provided in accordance with an embodiment of the present application.

[0022] Figure 2 for Figure 1 A communication architecture diagram of the wireless transmission module of the multi-segment signal acquisition component.

[0023] Figure 3 for Figure 1 A schematic diagram of a circuit board of a multi-segment signal acquisition component is shown.

[0024] Figure 4 A communication architecture diagram of a battery management system provided in accordance with an embodiment of the present application.

[0025] Main component symbols

[0026] Signal acquisition component 100

[0027] Circuit board 10

[0028] Wireless transmission module 20

[0029] Battery Cell 200

[0030] Analog front end 21

[0031] Wireless communication chip 22

[0032] Power chip 23

[0033] The first relay transmitting antenna 24

[0034] Fuse 25

[0035] Mainboard receiving chip 26

[0036] Second relay transmitting antenna 27

[0037] Dynamic power regulation module 28

[0038] Encryption module 29

[0039] Connector 32

[0040] Main body 11

[0041] Connecting part 12

[0042] Temperature measurement unit 13

[0043] Battery Management System 300 DETAILED DESCRIPTION

[0044] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0045] In addition, in the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present application. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0046] See also Figure 1An embodiment of the present application provides a multi-segment signal acquisition component 100 (hereinafter referred to as the signal acquisition component 100), and the signal acquisition component 100 includes a plurality of circuit boards 10 and a plurality of wireless transmission modules 20. Each of the wireless transmission modules 20 is arranged on one of the circuit boards 10. Each of the circuit boards 10 is used to connect one or more of the battery cells 200 to obtain or transmit parameter signals with the battery cells 200. The parameter signals of the battery cells 200 may be current, voltage, temperature, pressure, etc. Each of the wireless transmission modules 20 may be used to receive the parameter signals and output the parameter signals in the form of radio waves. At least every two adjacent wireless transmission modules 20 have the function of wireless communication, that is, each of the wireless transmission modules 20 may also be used to receive wireless signals from other wireless transmission modules 20, or to transmit wireless signals to other wireless transmission modules 20.

[0047] Compared with the prior art, the signal acquisition component 100 provided in the present application sets a wireless transmission module 20 on each circuit board 10, so that signal transmission can be performed between each adjacent two circuit boards 10 without physical connection, and there is no need to fold and straighten the signal acquisition component 100 when installing, which is helpful to simplify the production process of the signal acquisition component 100, reduce the complexity of installation, and at the same time help to improve installation efficiency and reduce potential damage risks.

[0048] In addition, if a circuit board 10 or a wireless transmission module 20 is damaged, only the damaged circuit board 10 or the wireless transmission module 20 can be replaced without replacing the entire signal acquisition component 100, thereby reducing the maintenance cost. Similarly, if the battery cell 200 on the battery module fails, the circuit board 10 corresponding to the failed battery cell 200 can be directly disassembled first, and then the relevant part of the battery cell 200 can be replaced without affecting other normally working batteries 200, which is conducive to disassembly and maintenance.

[0049] In addition, a wireless transmission module 20 is provided on each circuit board 10, so that the parameter signals (such as current, voltage, temperature, and pressure) of the collected battery cells 200 can be directly, synchronously, and losslessly transmitted to the wireless communication receiving chip of the battery management system 300 (Battery Management System, BMS). This is conducive to reducing the delay of the signal on the transmission path, ensuring the synchronization, safety, and reliability of signal transmission, and improving the signal acquisition accuracy and response speed of the entire battery pack.

[0050] See also Figure 1 and Figure 2In this embodiment, the wireless transmission module 20 includes an analog front end 21, a wireless communication chip 22 and a power chip 23. The analog front end 21 is connected to the circuit board 10, and is used to convert the parameter signal of the battery cell 200, for example, the conversion of the analog signal of the voltage and the digital model of the voltage to obtain a secondary signal. The wireless communication chip 22 is connected to the analog front end 21, and is used to transmit the secondary signal in the form of radio waves or receive the secondary signal sent by another wireless communication chip 22. The power chip 23 is connected to the battery cell 200, the analog front end 21 and the wireless communication chip 22, and is used to adjust the output voltage of the battery cell 200 to a voltage that can be used by the analog front end 21 and the wireless communication chip 22. Each of the wireless transmission modules 20 also includes a dynamic power adjustment module 28, and the dynamic power adjustment module 28 is connected to the power chip 23. The dynamic power adjustment module 28 automatically adjusts the power supply power provided by the power chip 23 to the analog front end 21 and the wireless communication chip 22 according to the actual needs of the signal. In this way, it not only optimizes energy consumption, but also ensures stable communication quality at different distances and in different signal environments. The analog front end 21 specifically includes OPT3101RHFR of Texas Instruments. The wireless communication chip 22 specifically includes CC2662R-Q1 of Texas Instruments. The power chip 23 specifically includes TPS65988 of Texas Instruments or LT3080 of Linear Technology (for voltage regulation).

[0051] In this embodiment, each of the wireless transmission modules 20 further includes a first relay transmitting antenna 24, which is connected to the wireless communication chip 22. The first relay transmitting antenna 24 is used to amplify the secondary signal and ensure its strength and stability during the wireless transmission process. Among them, the first relay transmitting antenna 24 is CC2662R-Q1 of Texas Instruments. The analog front end 21 is connected to the wireless communication chip 22 via a serial peripheral interface (SPI), ensuring efficient and stable data exchange between the two. Each of the wireless transmission modules 20 further includes an encryption module 29, which is integrated into each of the wireless communication chips 22. The encryption module 29 is responsible for encrypting the transmitted data to prevent the data from being intercepted or tampered with during the wireless transmission process, and to ensure the security and privacy of the parameters of the battery cell 200.

[0052] In this embodiment, the wireless transmission module 20 is connected to the circuit board 10 via a single in-line package (SIP). This connection method is conducive to simplifying the installation process of the wireless transmission module 20, while improving the overall reliability and durability of the wireless transmission module 20.

[0053] See also Figure 1 and Figure 3 In this embodiment, a plurality of the circuit boards 10 are arranged side by side, and each of the circuit boards 10 includes a main body 11, a connecting portion 12 connected to the main body 11, and a temperature measuring portion 13. The connecting portion 12 is used to connect the battery cell 200 and the main body 11 to ensure that the electrical parameters of the battery cell 200 can be effectively collected. The temperature measuring portion 13 is used to connect the battery cell 200 and the main body 11, and monitor the temperature of the battery cell 200 through a negative temperature coefficient thermistor (NTC). Among them, the main body 11 includes a soft board, which increases the flexibility of the circuit board 10. The connecting portion 12 includes a nickel sheet to ensure good electrical connection. The temperature measuring portion 13 includes a negative temperature coefficient thermistor (such as a special NTC for vehicle-mounted use of NTC manufacturers such as TDK or Murata), which is used to accurately monitor the temperature of the battery cell 200 to improve the safety and efficiency of the battery management system 300. In other embodiments of the present application, the main body 11 can be a hard board and a soft-hard board.

[0054] In this embodiment, each circuit board 10 further includes a fuse 25 , which connects the connection portion 12 and the main body 11 to provide overcurrent protection to prevent the circuit board 10 and the battery cell 200 from being damaged under abnormal circumstances.

[0055] In this embodiment, the communication between the circuit boards 10 is mainly completed wirelessly, but in some cases, it may be necessary to quickly exchange data or share power through physical means. To this end, each circuit board 10 is provided with a connector 32, which is designed as an optional connection method and can be quickly connected when data synchronization or power sharing through physical connection is required.

[0056] In this embodiment, the number of the circuit boards 10 is 6, and the length of each main body 11 is less than 500 mm to adapt to the operation and process of manufacturing equipment of the circuit board 10. It can be understood that the length of the circuit board 10 can be designed comprehensively based on the length of the battery pack and the number and distribution of the battery cells 200.

[0057] See also Figure 1 and Figure 4, an embodiment of the present application also provides a battery management system 300, including the signal acquisition component 100 and the mainboard receiving chip 26. The communication between the first relay transmitting antenna 24 and the mainboard receiving chip 26 can adopt a variety of wireless induction communication methods, including but not limited to near field communication (NFC), Bluetooth or Star Flash (an efficient short-range wireless communication technology). Such a design is conducive to improving the flexibility and applicability of signal transmission, ensuring efficient and reliable data transmission in different application environments.

[0058] Specifically, the communication standard can adopt the BR / EDR (Basic Rate / Enhanced Data Rate) mode, which is a Bluetooth communication mode that supports high data transmission rates. BR / EDR technology allows data to be transmitted on the 2.4GHz ISM (Industrial, Scientific and Medical) band, which provides wide compatibility and high-speed data transmission capabilities for wireless communications. The adoption of this communication standard can not only enhance the transmission distance and stability of the signal, but also increase the rate of data transmission, thereby effectively supporting real-time monitoring and management of battery status parameters (such as current, voltage, temperature, pressure, etc.). By adopting a variety of wireless communication technologies and efficient communication standards, this embodiment ensures that the data transmission from the battery cell 200 to the battery management system 300 is not only fast and stable, but also can adapt to different operating environments and requirements, further improving the performance and reliability of the entire battery management system 300. The flexibility and efficiency of this communication mechanism can ensure the safety and efficiency of the operation of electric vehicles for the battery management system 300 in modern electric vehicles.

[0059] In this embodiment, the battery management system 300 further includes a second relay transmitting antenna 27, and the mainboard receiving chip 26 is connected to the second relay transmitting antenna 27. The second relay transmitting antenna 27 is used to enhance the wireless communication capability with an external system (such as other electronic systems of an electric vehicle or a remote monitoring center), ensuring that the long-distance transmission of signals is not interfered with, thereby improving the communication efficiency and reliability of the entire system. Among them, the second relay transmitting antenna 27 is CC2662R-Q1 of Texas Instruments.

[0060] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application is described in detail with reference to the above implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A multi-segment signal acquisition component for collecting signals from battery cells, characterized in that: include: Multiple circuit boards; A plurality of wireless transmission modules, each of which is disposed on one of the circuit boards, each of which has a wireless communication function between two adjacent wireless transmission modules, and each of which includes: An analog front end, the analog front end is connected to the circuit board and is used to convert the signal of the battery cell to obtain a secondary signal; a wireless communication chip, the wireless communication chip being connected to the analog front end and being used for wirelessly transmitting and receiving the secondary signal, and A power chip is connected to the analog front end and the wireless communication chip, and the power chip is used to connect the battery cell and provide power to the analog front end and the wireless communication chip.

2. The multi-segment signal acquisition component according to claim 1, characterized in that: A plurality of the circuit boards are arranged side by side, and each of the circuit boards comprises a main body, a connecting part connected to the main body, and a temperature measuring part, wherein the connecting part is used to connect the battery cell, and the temperature measuring part is used to connect the battery cell.

3. The multi-segment signal acquisition component according to claim 2, characterized in that: The main body includes a soft board, the connecting part includes a nickel sheet, and the temperature measuring part includes a negative temperature coefficient thermistor.

4. The multi-segment signal acquisition component according to claim 2, characterized in that: Each of the circuit boards further includes a fuse, and the fuse connects the connection portion and the main body portion.

5. The multi-segment signal acquisition component according to claim 2, characterized in that: The length of the main body is less than 500 mm.

6. The multi-segment signal acquisition component according to claim 1, characterized in that: Each of the wireless transmission modules further includes a first relay transmitting antenna, which is connected to the wireless communication chip and is used to amplify the secondary signal.

7. The multi-segment signal acquisition component according to claim 1, characterized in that: The analog front end is connected to the wireless communication chip via a serial peripheral device interface.

8. The multi-segment signal acquisition component according to claim 1, characterized in that: The wireless transmission module is connected to the circuit board in a single in-line package manner.

9. A battery management system, characterized in that: It comprises a multi-segment signal acquisition component as described in any one of claims 1 to 8 and a mainboard receiving chip, wherein the mainboard receiving chip can perform wireless communication with each of the wireless transmission modules.

10. The battery management system according to claim 9, characterized in that: It also includes a second relay transmitting antenna, and the mainboard receiving chip is connected to the second relay transmitting antenna.

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