A battery management system

Abstract

The utility model discloses a kind of battery management systems, it includes data acquisition module, data sending module and data processing module;The data acquisition module is connected with the data sending module by SPI transmission mode, the data sending module and the data processing module are communicated based on BLE protocol, the data acquisition module is used to collect the state data of battery module and the state data is wirelessly transmitted to the data processing module by the data sending module.The battery management system provided by the utility model can reduce wire harness and connector in battery based on low-power consumption bluetooth technology, improve modularization degree, can reduce weight and cost, improve energy density and other advantages, reduce complex wiring in battery pack, reduce manual operation fault tolerance, improve assembly efficiency, reduce overall life cycle.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery management system. Background Technology

[0002] Traditional BMS (Battery Management Systems) mostly use wired connections, which suffers from complex wiring, high costs, and difficult maintenance. The use of Bluetooth Low Energy (BLE) is of great significance to the development of modern technology industries and is widely used in smart homes, health monitors, wearable devices, and other fields. With the maturity and widespread adoption of Bluetooth technology, its low power consumption, high reliability, and ease of deployment provide a new approach to wireless BMS. Achieving wireless communication between the BMS and other systems (handheld terminals, central control units, etc.) via Bluetooth can significantly optimize system architecture and improve overall performance. Utility Model Content

[0003] Based on this, the present invention provides a battery management system that, based on low-power Bluetooth technology, reduces the number of wiring harnesses and connectors inside the battery, thereby reducing weight and cost, increasing energy density, reducing complex wiring within the battery pack, reducing the tolerance for manual operation errors, improving assembly efficiency, and shortening the overall lifespan.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a battery management system, which includes a data acquisition module, a data transmission module, and a data processing module. The data acquisition module is connected to the data transmission module via SPI transmission, and the data transmission module communicates with the data processing module based on the BLE protocol. The data acquisition module is used to acquire the status data of the battery module and wirelessly transmit the status data to the data processing module through the data transmission module.

[0005] As a further improvement to the above-mentioned solution of this utility model, the status data includes voltage data, temperature data, and equalization information.

[0006] As a further improvement to the above-mentioned solution of this utility model, the data processing module performs SOH calculation and SOC calculation on the state data and stores them.

[0007] As a further improvement to the above-mentioned solution of this utility model, the data acquisition module includes an acquisition front-end AFE chip U1, a voltage acquisition circuit, a temperature acquisition circuit, and an equalization circuit.

[0008] As a further improvement to the above-mentioned solution of this utility model, the voltage acquisition circuit includes capacitor C102, resistor R105, capacitor C149, capacitor C101, resistor R103, capacitor C137, resistor R102, capacitor C191 and capacitor C111. PIN2 of the front-end AFE chip U1 is connected to capacitor C102 and resistor R105. The other end of capacitor C102 is connected to PIN4 of the front-end AFE chip U1. The other end of resistor R105 is connected to cell CELL18 and capacitor C149 of the battery module. The other end of capacitor C149 is connected to the positive terminal of cell CELL17. Pin 38 of the front-end AFE chip U1 is connected to capacitor C101 and resistor R103. The other end of capacitor C101 is connected to pin 40 of the front-end AFE chip U1. The other end of resistor R103 is connected to the positive terminal of cell CELL1 of the battery module and capacitor C137. The other end of capacitor C137 is connected to the negative terminal of cell CELL1. Pin 40 of the front-end AFE chip U1 is connected to resistor R102. The other end of resistor R102 is connected to capacitor C111 and the negative terminal of cell CELL1 of the battery module. The other end of capacitor C111 is grounded, and capacitor C191 is connected to the negative terminal of cell CELL1.

[0009] As a further improvement to the above-mentioned solution of this utility model, the temperature acquisition circuit includes resistor R134, capacitor C150, resistor R133, connector TA0, resistor R136, capacitor C151, resistor R135, connector TA1, resistor R138, capacitor C152, resistor R137 and connector TA9. Pin 64 of the front-end AFE chip U1 is connected to resistor R134 and capacitor C150. The other end of capacitor C150 is connected to GND. The other end of resistor R134 is connected to resistor R133 and connector TA0. The other end of resistor R133 is connected to pin 54 of AFE chip U1. Pin 63 of the front-end AFE chip U1 is connected to resistor R136 and capacitor C151. The other end of capacitor C151 is connected to GND. The other end of resistor R136 is connected to resistor R135 and connector TA1. The other end of resistor R135 is connected to pin 54 of AFE chip U1. Pin 49 of the front-end AFE chip U1 is connected to resistor R138 and capacitor C152. The other end of capacitor C152 is connected to GND. The other end of resistor R138 is connected to resistor R137 and connector TA9. The other end of resistor R137 is connected to pin 54 of AFE chip U1.

[0010] As a further improvement to the above-mentioned solution of this utility model, the equalization circuit includes resistors RB100 and RB115, capacitor C176, Zener diode Z100, resistors RB120 and RB130, capacitor C167 and Zener diode Z109. The positive terminal of the battery cell CELL18 in the battery module is connected to resistor RB100 and resistor RB115. The other end of resistor RB100 is connected to the other end of RB115 and connected to capacitor C176 and the negative terminal of Zener diode Z100 to PIN3 of the front-end AFE chip U1. The other end of capacitor C176 and the positive terminal of Zener diode Z100 are connected to PIN5 of the front-end AFE chip U1. The positive terminal of the battery cell CELL1 in the battery module is connected to resistors RB120 and RB130. The other end of resistor RB120 is connected to the other end of RB130 and connected to the negative terminal of capacitor C167 and Zener diode Z109 to PIN39 of the front-end AFE chip U1. The other end of capacitor C167 and the positive terminal of Zener diode Z109 are connected to PIN5 of the front-end AFE chip U1.

[0011] As a further improvement of the above-mentioned solution of this utility model, the data transmission module includes a BLE chip U4, a crystal oscillator Y1, a crystal oscillator X1, a resistor R13, a capacitor C19, a capacitor C12, a capacitor C16, an inductor L7, a capacitor C15, a capacitor C18, an inductor L8, a resistor R12, a resistor R9, an antenna ANT2, and an onboard antenna ANT1. Pin 40 of BLE chip U4 is connected to crystal oscillator Y1, and the other end of crystal oscillator Y1 is connected to pin 39 of BLE chip U4; pin 9 of U4 is connected to pin 3 of crystal oscillator X1, pin 1 of crystal oscillator X1 is connected to pin 10 of BLE chip U4, and pins 3-4 of crystal oscillator X1 are connected to GND; pin 1 of BLE chip U4 is connected to pin 45 of acquisition front-end AFE chip U1, pin 2 of BLE chip U4 is connected to pin 48 of acquisition front-end AFE chip U1, pin 3 of BLE chip U4 is connected to pin 43 of acquisition front-end AFE chip U1, and pin 4 of BLE chip U4 is connected to pin 42 of acquisition front-end AFE chip U1. Pin 12 of BLE chip U4 is connected to resistor R13 and capacitor C19. The other end of capacitor C19 is connected to GND, and the other end of resistor R13 is connected to VDD_3.3V. Pin 30 of BLE chip U4 is connected to capacitor C12, and the other end of capacitor C12 is connected to GND. Pin 14 of BLE chip U4 is connected to capacitor C16 and inductor L7. The other end of capacitor C16 is connected to GND. The other end of inductor L7 is connected to capacitors C17 and C15. The other end of capacitor C17 is connected to GND. The other end of capacitor C15 is connected to capacitor C18 and inductor L8. The other end of capacitor C18 is connected to GND. The other end of inductor L8 is connected to resistors R12 and R9. The other end of resistor R12 is connected to pin 1 of antenna ANT2. Pins 2-3 of antenna ANT2 are connected to GND. The other end of resistor R9 is connected to pin 1 of onboard antenna ANT1. Pins 2-4 of onboard antenna ANT1 are connected to GND.

[0012] As a further improvement to the above-mentioned solution of this utility model, the data processing module includes a BLE chip U3, crystal oscillator Y4, crystal oscillator Y5, resistor R228, light-emitting diode LED, inductor L25, capacitor C171, resistor R229, resistor R231, IIC bus, resistor R232, capacitor C177, inductor L27, capacitor C176, inductor L26, capacitor C175, capacitor C178, capacitor C13, resistor R227, capacitor C30, and antenna U.FL; Pin 11 of BLE chip U3 is connected to pin 3 of crystal oscillator Y4, pin 1 of crystal oscillator Y4 is connected to pin 12 of BLE chip U3, and pins 2 and 4 of crystal oscillator Y4 are connected to GND; pin 47 of BLE chip U3 is connected to crystal oscillator Y5, and the other end of crystal oscillator Y5 is connected to pin 48 of BLE chip U3; pin 28 of BLE chip U3 is connected to resistor R228, the other end of resistor R228 is connected to LED, and the other end of LED is connected to GND. Pin 37 of BLE chip U3 is connected to inductor L25. The other end of inductor L25 is connected to pin 40 of BLE chip U3 and capacitor C171. The other end of capacitor C171 is connected to GND. Pin 18 of BLE chip U3 is connected to resistor R229. The other end of resistor R229 is connected to the external power supply circuit. Pin 22 of BLE chip U3 is connected to resistor R231. The other end of resistor R231 is connected to the TX interface of the IIC bus. Pin 23 of BLE chip U3 is connected to resistor R232. The other end of resistor R232 is connected to the RX interface of the IIC bus. Pin 16 of BLE chip U3 is connected to capacitor C177 and inductor L27. The other end of capacitor C177 is connected to GND. The other end of inductor L127 is connected to capacitors C176 and L26. The other end of capacitor C176 is connected to GND. The other end of inductor L26 is connected to capacitors C175 and C178. The other end of capacitor C175 is connected to GND. The other end of capacitor C178 is connected to capacitor C13 and resistor R227. The other end of capacitor C13 is connected to GND. The other end of resistor R227 is connected to capacitor C30 and antenna U.FL. The other end of capacitor C30 is connected to GND.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The battery management system provided by this utility model, based on low-power Bluetooth technology, can reduce the number of wiring harnesses and connectors in the battery, improve modularity, reduce weight and cost, increase energy density, and reduce the complexity of wiring in the battery pack, reduce the error rate of manual operation, improve assembly efficiency, and shorten the overall life cycle. Attached Figure Description

[0014] Figure 1 A circuit diagram of a data acquisition module in a battery management system provided for an embodiment of this utility model; Figure 2 A circuit diagram of a data transmission module in a battery management system provided for an embodiment of this utility model; Figure 3 A circuit diagram of a data processing module in a battery management system provided for an embodiment of this utility model. Detailed Implementation

[0015] To facilitate understanding of this invention, a more comprehensive description of the invention will be provided below with reference to specific embodiments. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this invention.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0017] This embodiment proposes a battery management system, including a data acquisition module, a data transmission module, and a data processing module.

[0018] The data acquisition module is used to collect status data of the battery module (including voltage data, temperature data, and equalization information) and transmit it to the data transmission module via the serial interface SPI. In this embodiment, the data acquisition module includes a front-end AFE chip U1, a voltage acquisition circuit, a temperature acquisition circuit, and an equalization circuit. Combined with... Figure 1 ,in: The voltage acquisition circuit includes capacitor C102, resistor R105, capacitor C149, capacitor C101, resistor R103, capacitor C137, resistor R102, capacitor C191, and capacitor C111. Pin 2 of AFE chip U1 is connected to capacitor C102 and resistor R105. The other end of capacitor C102 is connected to pin 4 of AFE chip U1. The other end of resistor R105 is connected to cell CELL18 and capacitor C149 of the battery module. The other end of capacitor C149 is connected to the positive terminal of cell CELL17 of the battery module. Pin 38 of AFE chip U1 is connected to capacitor C101 and resistor R103. The other end of capacitor C101 is connected to pin 40 of AFE chip U1. The other end of resistor R103 is connected to the positive terminal of cell CELL1 and capacitor C137 of the battery module. The other end of capacitor C137 is connected to the negative terminal of cell CELL1. Pin 40 of AFE chip U1 is connected to resistor R102. The other end of resistor R102 is connected to capacitor C111 and the negative terminal of cell CELL1. The other end of capacitor C111 is grounded. Capacitor C191 is connected to the negative terminal of cell CELL1.

[0019] The temperature acquisition circuit includes resistor R134, capacitor C150, resistor R133, connector TA0, resistor R136, capacitor C151, resistor R135, connector TA1, resistor R138, capacitor C152, resistor R137, and connector TA9. Pin 64 of AFE chip U1 is connected to resistor R134 and capacitor C150. The other end of capacitor C150 is connected to GND. The other end of resistor R134 is connected to resistor R133 and connector TA0. The other end of resistor R133 is connected to pin 54 of AFE chip U1. Pin 63 of AFE chip U1 is connected to resistor R136 and capacitor C151. The other end of capacitor C151 is connected to GND. The other end of resistor R136 is connected to resistor R135 and connector TA1. The other end of resistor R135 is connected to pin 54 of AFE chip U1. Pin 49 of AFE chip U1 is connected to resistor R138 and capacitor C152. The other end of capacitor C152 is connected to GND. The other end of resistor R138 is connected to resistor R137 and connector TA9. The other end of resistor R137 is connected to pin 54 of AFE chip U1.

[0020] The equalization circuit includes resistors RB100 and RB115, capacitor C176, Zener diode Z100, resistors RB120 and RB130, capacitor C167, and Zener diode Z109. The positive terminal of cell CELL18 is connected to resistors RB100 and RB115. The other end of resistor RB100 is connected to the other end of RB115 and then connected to capacitor C176 and the negative terminal of Zener diode Z100, which are connected to PIN3 of AFE chip U1. The other end of capacitor C176 and the positive terminal of Zener diode Z100 are connected to PIN5 of AFE chip U1. The positive terminal of cell CELL1 is connected to resistors RB120 and RB130. The other end of resistor RB120 is connected to the other end of RB130 and then connected to capacitor C167 and the negative terminal of Zener diode Z109, which are connected to PIN39 of AFE chip U1. The other end of capacitor C167 and the positive terminal of Zener diode Z109 are connected to PIN5 of AFE chip U1.

[0021] The data transmission module transmits status data to the data processing module via BLE wireless communication. Figure 2 The data transmission module includes BLE chip U4, crystal oscillator Y1, crystal oscillator X1, resistor R13, capacitor C19, capacitor C12, capacitor C16, inductor L7, capacitor C15, capacitor C18, inductor L8, resistor R12, resistor R9, antenna ANT2, and onboard antenna ANT1.

[0022] Pin 1 of BLE chip U4 is connected to pin 45 of AFE chip U1. Pin 2 of BLE chip U4 is connected to pin 48 of AFE chip U1. Pin 3 of BLE chip U4 is connected to pin 43 of AFE chip U1. Pin 4 of BLE chip U4 is connected to pin 42 of AFE chip U1. Pin 40 of BLE chip U4 is connected to crystal oscillator Y1, and the other end of crystal oscillator Y1 is connected to pin 39 of BLE chip U4. Pin 9 of U4 is connected to pin 3 of crystal oscillator X1. Pin 1 of crystal oscillator X1 is connected to pin 10 of BLE chip U4. Pins 3-4 of crystal oscillator X1 are connected to GND. Pin 12 of BLE chip U4 is connected to resistor R13 and capacitor C19. The other end of capacitor C19 is connected to GND, and the other end of resistor R13 is connected to VDD_3.3V. Pin 30 of BLE chip U4 is connected to capacitor C12, and the other end of capacitor C12 is connected to GND. Pin 1 of BLE chip U4... 4. Connect capacitor C16 and inductor L7. The other end of capacitor C16 is connected to GND. The other end of inductor L7 is connected to capacitors C17 and C15. The other end of capacitor C17 is connected to GND. The other end of capacitor C15 is connected to capacitor C18 and inductor L8. The other end of capacitor C18 is connected to GND. The other end of inductor L8 is connected to resistors R12 and R9. The other end of resistor R12 is connected to pin 1 of antenna ANT2. Pins 2-3 of antenna ANT2 are connected to GND. The other end of resistor R9 is connected to pin 1 of onboard antenna ANT1. Pins 2-4 of onboard antenna ANT1 are connected to GND.

[0023] The data processing module processes (including SOH calculation and SOC calculation) and stores the status data. It should be noted that the methods used in the SOH and SOC calculations of the BMS data processing module in this embodiment are existing technologies, and these specific algorithms are not the innovation of this invention. Figure 3The data processing module includes a BLE chip U3, crystal oscillator Y4, crystal oscillator Y5, resistor R228, light-emitting diode (LED), inductor L25, capacitor C171, resistor R229, resistor R231, IIC bus, resistor R232, capacitor C177, inductor L27, capacitor C176, inductor L26, capacitor C175, capacitor C178, capacitor C13, resistor R227, capacitor C30, and antenna U.FL. Pin 11 of BLE chip U3 is connected to pin 3 of crystal oscillator Y4. Pin 1 of crystal oscillator Y4 is connected to pin 12 of BLE chip U3. Pins 2 and 4 of crystal oscillator Y4 are connected to GND. Pin 47 of BLE chip U3 is connected to crystal oscillator Y5. The other end of crystal oscillator Y5 is connected to pin 48 of BLE chip U3. Pin 28 of BLE chip U3 is connected to resistor R228. The other end of resistor R228 is connected to LED. The other end of LED is connected to GND. Pin 37 of BLE chip U3 is connected to inductor L25. The other end of inductor L25 is connected to pin 40 of BLE chip U3 and capacitor C171. The other end of capacitor C171 is connected to GND. Pin 18 of BLE chip U3 is connected to resistor R229. The other end of resistor R229 is connected to external power supply circuit V3.3. PIN22 of the BLE chip U3 is connected to resistor R231, and the other end of resistor R231 is connected to the TX interface of the IIC bus. PIN23 of the BLE chip U3 is connected to resistor R232, and the other end of resistor R232 is connected to the RX interface of the IIC bus. PIN16 of the BLE chip U3 is connected to capacitor C177 and inductor L27, with the other end of capacitor C177 connected to GND. The other end of inductor L127 is connected to capacitors C176 and L26, with the other end of capacitor C176 connected to GND. The other end of inductor L26 is connected to capacitors C175 and C178, with the other end of capacitor C175 connected to GND. The other end of capacitor C178 is connected to capacitor C13 and resistor R227, with the other end of capacitor C13 connected to GND. The other end of resistor R227 is connected to capacitor C30 and antenna U.FL, with the other end of capacitor C30 connected to GND.

[0024] It should be noted that the cell CELL1, cell CELL17, etc. involved in this utility model are all cell numbers in the battery module. The battery module contains multiple cells, namely CELL1, CELL2, CELL3, ..., where cell CELL1 represents the cell with serial number 1.

[0025] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0026] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery management system, characterized in that, It includes a data acquisition module, a data transmission module, and a data processing module; the data acquisition module is connected to the data transmission module via SPI transmission, and the data transmission module communicates with the data processing module based on the BLE protocol; the data acquisition module is used to acquire the status data of the battery module and wirelessly transmit the status data to the data processing module through the data transmission module.

2. The battery management system according to claim 1, characterized in that, The status data includes voltage data, temperature data, and equalization information.

3. The battery management system according to claim 1, characterized in that, The data processing module performs SOH calculation and SOC calculation on the state data and stores them.

4. The battery management system according to claim 2, characterized in that, The data acquisition module includes a front-end AFE chip U1, a voltage acquisition circuit, a temperature acquisition circuit, and an equalization circuit.

5. The battery management system according to claim 4, characterized in that, The voltage acquisition circuit includes capacitor C102, resistor R105, capacitor C149, capacitor C101, resistor R103, capacitor C137, resistor R102, capacitor C191, and capacitor C111. PIN2 of the front-end AFE chip U1 is connected to capacitor C102 and resistor R105. The other end of capacitor C102 is connected to PIN4 of the front-end AFE chip U1. The other end of resistor R105 is connected to cell CELL18 and capacitor C149 of the battery module. The other end of capacitor C149 is connected to the positive terminal of cell CELL17. Pin 38 of the front-end AFE chip U1 is connected to capacitor C101 and resistor R103. The other end of capacitor C101 is connected to pin 40 of the front-end AFE chip U1. The other end of resistor R103 is connected to the positive terminal of cell CELL1 of the battery module and capacitor C137. The other end of capacitor C137 is connected to the negative terminal of cell CELL1. Pin 40 of the front-end AFE chip U1 is connected to resistor R102. The other end of resistor R102 is connected to capacitor C111 and the negative terminal of cell CELL1 of the battery module. The other end of capacitor C111 is grounded, and capacitor C191 is connected to the negative terminal of cell CELL1.

6. The battery management system according to claim 4, characterized in that, The temperature acquisition circuit includes resistor R134, capacitor C150, resistor R133, connector TA0, resistor R136, capacitor C151, resistor R135, connector TA1, resistor R138, capacitor C152, resistor R137 and connector TA9. Pin 64 of the front-end AFE chip U1 is connected to resistor R134 and capacitor C150. The other end of capacitor C150 is connected to GND. The other end of resistor R134 is connected to resistor R133 and connector TA0. The other end of resistor R133 is connected to pin 54 of AFE chip U1. Pin 63 of the front-end AFE chip U1 is connected to resistor R136 and capacitor C151. The other end of capacitor C151 is connected to GND. The other end of resistor R136 is connected to resistor R135 and connector TA1. The other end of resistor R135 is connected to pin 54 of AFE chip U1. Pin 49 of the front-end AFE chip U1 is connected to resistor R138 and capacitor C152. The other end of capacitor C152 is connected to GND. The other end of resistor R138 is connected to resistor R137 and connector TA9. The other end of resistor R137 is connected to pin 54 of AFE chip U1.

7. The battery management system according to claim 4, characterized in that, The equalization circuit includes resistors RB100 and RB115, capacitor C176, Zener diode Z100, resistor RB120, resistor RB130, capacitor C167, and Zener diode Z109. The positive terminal of the battery cell CELL18 in the battery module is connected to resistor RB100 and resistor RB115. The other end of resistor RB100 is connected to the other end of RB115 and connected to capacitor C176 and the negative terminal of Zener diode Z100 to PIN3 of the front-end AFE chip U1. The other end of capacitor C176 and the positive terminal of Zener diode Z100 are connected to PIN5 of the front-end AFE chip U1. The positive terminal of the battery cell CELL1 in the battery module is connected to resistors RB120 and RB130. The other end of resistor RB120 is connected to the other end of RB130 and connected to the negative terminal of capacitor C167 and Zener diode Z109 to PIN39 of the front-end AFE chip U1. The other end of capacitor C167 and the positive terminal of Zener diode Z109 are connected to PIN5 of the front-end AFE chip U1.

8. The battery management system according to claim 4, characterized in that, The data transmission module includes a BLE chip U4, a crystal oscillator Y1, a crystal oscillator X1, a resistor R13, a capacitor C19, a capacitor C12, a capacitor C16, an inductor L7, a capacitor C15, a capacitor C18, an inductor L8, a resistor R12, a resistor R9, an antenna ANT2, and an onboard antenna ANT1. Pin 40 of BLE chip U4 is connected to crystal oscillator Y1, and the other end of crystal oscillator Y1 is connected to pin 39 of BLE chip U4; pin 9 of U4 is connected to pin 3 of crystal oscillator X1, pin 1 of crystal oscillator X1 is connected to pin 10 of BLE chip U4, and pins 3-4 of crystal oscillator X1 are connected to GND; pin 1 of BLE chip U4 is connected to pin 45 of acquisition front-end AFE chip U1, pin 2 of BLE chip U4 is connected to pin 48 of acquisition front-end AFE chip U1, pin 3 of BLE chip U4 is connected to pin 43 of acquisition front-end AFE chip U1, and pin 4 of BLE chip U4 is connected to pin 42 of acquisition front-end AFE chip U1. Pin 12 of BLE chip U4 is connected to resistor R13 and capacitor C19. The other end of capacitor C19 is connected to GND, and the other end of resistor R13 is connected to VDD_3.3V. Pin 30 of BLE chip U4 is connected to capacitor C12, and the other end of capacitor C12 is connected to GND. Pin 14 of BLE chip U4 is connected to capacitor C16 and inductor L7. The other end of capacitor C16 is connected to GND. The other end of inductor L7 is connected to capacitors C17 and C15. The other end of capacitor C17 is connected to GND. The other end of capacitor C15 is connected to capacitor C18 and inductor L8. The other end of capacitor C18 is connected to GND. The other end of inductor L8 is connected to resistors R12 and R9. The other end of resistor R12 is connected to pin 1 of antenna ANT2. Pins 2-3 of antenna ANT2 are connected to GND. The other end of resistor R9 is connected to pin 1 of onboard antenna ANT1. Pins 2-4 of onboard antenna ANT1 are connected to GND.

9. The battery management system according to claim 4, characterized in that, The data processing module includes a BLE chip U3, crystal oscillator Y4, crystal oscillator Y5, resistor R228, light-emitting diode (LED), inductor L25, capacitor C171, resistor R229, resistor R231, IIC bus, resistor R232, capacitor C177, inductor L27, capacitor C176, inductor L26, capacitor C175, capacitor C178, capacitor C13, resistor R227, capacitor C30, and antenna U.FL; Pin 11 of BLE chip U3 is connected to pin 3 of crystal oscillator Y4, pin 1 of crystal oscillator Y4 is connected to pin 12 of BLE chip U3, and pins 2 and 4 of crystal oscillator Y4 are connected to GND; pin 47 of BLE chip U3 is connected to crystal oscillator Y5, and the other end of crystal oscillator Y5 is connected to pin 48 of BLE chip U3; pin 28 of BLE chip U3 is connected to resistor R228, the other end of resistor R228 is connected to LED, and the other end of LED is connected to GND. Pin 37 of BLE chip U3 is connected to inductor L25. The other end of inductor L25 is connected to pin 40 of BLE chip U3 and capacitor C171. The other end of capacitor C171 is connected to GND. Pin 18 of BLE chip U3 is connected to resistor R229. The other end of resistor R229 is connected to the positive terminal of external power supply circuit V3.

3. Pin 22 of BLE chip U3 is connected to resistor R231. The other end of resistor R231 is connected to the TX interface of IIC bus. Pin 23 of BLE chip U3 is connected to resistor R232. The other end of resistor R232 is connected to the RX interface of IIC bus. Pin 16 of the BLE chip U3 is connected to capacitor C177 and inductor L27. The other end of capacitor C177 is connected to GND. The other end of inductor L127 is connected to capacitors C176 and L26. The other end of capacitor C176 is connected to GND. The other end of inductor L26 is connected to capacitors C175 and C178. The other end of capacitor C175 is connected to GND. The other end of capacitor C178 is connected to capacitor C13 and resistor R227. The other end of capacitor C13 is connected to GND. The other end of resistor R227 is connected to capacitor C30 and antenna U.FL. The other end of capacitor C30 is connected to GND.

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