Battery management system based on radio frequency technology, battery pack and electric equipment

Abstract

The utility model provides a radio frequency technology-based battery management system, a battery pack and electric equipment. Each first radio frequency communication module is correspondingly connected with one battery monomer of the battery pack and is fixed on the corresponding battery monomer; the second radio frequency communication module is in wireless communication connection with the first radio frequency communication module; and the main control module is in wired connection with the second radio frequency communication module. All unnecessary wire harnesses are thoroughly eliminated, so that the wiring complexity is reduced, the design and assembly processes of the battery pack are simplified, the system failure risk caused by wire harness faults is reduced, and the design flexibility is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack management technical field especially relates to a kind of battery management system, battery pack and electric equipment based on radio frequency technology. BACKGROUND

[0002] In the field of electric vehicles and energy storage systems, battery management system (BMS) is a key component to ensure the safe and efficient operation of battery pack. Traditional wired BMS connects each battery unit through a large number of wiring harnesses to achieve monitoring and management of voltage, temperature and other parameters. However, this design brings several challenges:

[0003] Complex wiring: Traditional BMS requires a large number of communication lines and acquisition lines to connect each battery unit, resulting in complex wiring, increased installation difficulty and cost of the system.

[0004] Limited design flexibility: The numerous wiring harnesses limit the design flexibility of the battery pack, making it difficult to meet the needs of modern automotive lightweighting, automation and standardization.

[0005] Weight problem: A large number of wiring harnesses increase the weight of the overall system, affecting the range and other performance indicators of electric vehicles.

[0006] To solve the above problems, wireless BMS emerges as the times require. Wireless BMS removes communication lines, reducing wiring complexity and improving design flexibility. However, existing wireless BMS solutions still have some limitations:

[0007] Acquisition lines are not optimized: Although the communication lines are removed, the original acquisition lines are still retained, and the wiring complexity and weight problem are not fundamentally solved.

[0008] Limited data acquisition capability: Current wireless BMS can only collect voltage and temperature information, cannot directly measure equalization current, and can only rely on estimation methods, which may lead to inaccurate battery state evaluation.

[0009] Lack of traceability of individual battery units: Existing BMS cannot uniquely encode and trace each battery unit, making it difficult to quickly locate the source of the problem when problems occur, increasing maintenance costs and time.

[0010] In summary, although wireless BMS has improved compared to traditional wired BMS, there is still room for improvement in acquisition line optimization, data acquisition capability and battery unit traceability. Therefore, it is an urgent need to develop a new type of wireless BMS that can comprehensively solve these problems. SUMMARY

[0011] Based on the above, the utility model provides a kind of battery management system, battery pack and electric equipment based on radio frequency technology, to solve the technical problems that existing wireless BMS still needs to be improved in aspects such as acquisition wiring harness optimization.

[0012] A kind of battery management system based on radio frequency technology, comprising:

[0013] A number of first radio frequency communication module, each first radio frequency communication module corresponds to connect the battery pack of one battery cell, and fixed on corresponding battery cell;

[0014] Second radio frequency communication module, with first radio frequency communication module and is wirelessly connected;

[0015] Main control module, and second radio frequency communication module is connected.

[0016] Further, first radio frequency communication module is fixed on the upper cover of corresponding battery cell.

[0017] Further, first radio frequency communication module is fixed in the upper cover inside of corresponding battery cell.

[0018] Further, first radio frequency communication module is integrated with equalization current sampling module.

[0019] Further, first radio frequency communication module is integrated with temperature sampling module.

[0020] Further, first radio frequency communication module is integrated with over-temperature diagnosis module and / or over-current diagnosis module.

[0021] Further, second radio frequency communication module and main control module are all on main control board.

[0022] Further, second radio frequency communication module and main control module are connected by SPI signal line.

[0023] A kind of battery pack, contains a kind of battery management system based on radio frequency technology as described above.

[0024] A kind of electric equipment, and electric equipment includes the battery pack of preceding described.

[0025] The beneficial technical effects of the utility model are that by fixing a first radio frequency communication module on each battery cell, wireless communication between the first radio frequency communication module and the BMS main control module is realized, so that all unnecessary wiring harnesses are completely eliminated, which not only reduces wiring complexity, simplifies the design and assembly process of the battery pack, reduces the risk of system failure caused by wiring harness failure, and improves design flexibility, reduces the installation difficulty and cost of the system. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1The utility model provides a first radio frequency communication module and battery monomer connection circuit schematic diagram of battery management system based on radio frequency technique.

[0027] Figure 2 The utility model provides a first radio frequency communication module and battery monomer connection circuit schematic diagram of battery management system based on radio frequency technique. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0030] The utility model will be further described below in combination with the drawings and specific embodiments, but not as the limitation of the utility model.

[0031] The utility model provides a kind of battery management system based on radio frequency technique, comprising:

[0032] A plurality of first radio frequency communication module (2), each first radio frequency communication module is connected with the battery pack one battery monomer (1), and is fixed on corresponding battery monomer (1);

[0033] Second radio frequency communication module (3), with first radio frequency communication module (2) wireless communication connection;

[0034] Master module (4), and second radio frequency communication module (3) are connected.

[0035] Compared with prior wireless battery management system (BMS), although the latter has removed communication wire harness, but still retains acquisition wire harness.

[0036] The utility model is fixed with a first radio frequency communication module (2) on each battery monomer (1), realizes wireless communication between BMS master module, to eliminate all unnecessary wire harness completely.This not only simplifies the design and assembly process of battery pack, also reduces the system failure risk caused by wire harness failure. Reduce wiring complexity, and improve design flexibility. Reduce the installation difficulty and cost of system.

[0037] Further, first radio frequency communication module (2) is fixed on the upper cover of corresponding battery monomer (1).

[0038] The first radio frequency communication module (2) is directly fixed on the upper cover of the battery monomer (1) and is bound with the battery monomer (1), and is connected with the positive and negative poles of the battery monomer through two pins to receive power supply of the battery monomer.

[0039] Further, the first radio frequency communication module (2) is fixed inside the upper cover of the corresponding battery monomer (1).

[0040] By fixing the first radio frequency communication module (2) inside the upper cover and connecting the pins with the battery monomer (1), the wire harness is completely eliminated.

[0041] Specifically, each first radio frequency communication module (2) has a unique identity code.

[0042] Each first radio frequency communication module (2) has a unique identity code, which provides a unique coded identification for each battery monomer (1). This not only helps to track and manage each battery monomer throughout its life cycle and achieve traceability, but also improves the reliability and maintenance efficiency of the system. Once a problem occurs, the specific battery monomer can be quickly located through the identity code, greatly simplifying the troubleshooting and repair process.

[0043] Further, the first radio frequency communication module (2) is integrated with a balanced current sampling module.

[0044] The existing wireless BMS cannot directly measure the balanced current of the battery monomer (1) and can only estimate it. However, in the present application, the balanced current sampling module integrated in the first radio frequency communication module can accurately measure the balanced current. This design enables the system to more accurately monitor and adjust the power difference between each battery monomer (1), effectively improving the service life and performance of the entire battery.

[0045] As shown in Figure 1 The first radio frequency communication module (2) is connected to the positive pole of the battery monomer (1) through the pin VDD_CELL, so that the first radio frequency communication module is powered by the battery monomer (1).

[0046] The balanced current sampling module of the first radio frequency communication module (2) is connected to the balanced resistor R BALANCE , so as to sample signals. Preferably, the balanced current sampling module includes an ADC module, which converts the sampled balanced voltage analog signal into a balanced voltage digital signal, and converts the balanced voltage digital signal and the balanced resistance value into a balanced current, so as to measure the balanced current of the battery monomer (1).

[0047] Further, the first radio frequency communication module (2) is integrated with a temperature sampling module.

[0048] The temperature sensor is arranged on the battery monomer (1), and a temperature sampling module integrated in the first radio frequency communication module (2) samples to obtain temperature data of the battery monomer.

[0049] Further, the first radio frequency communication module (2) is integrated with an over-temperature diagnosis module and / or an over-current diagnosis module.

[0050] The over-temperature diagnosis module is an over-temperature diagnosis circuit connected to the temperature sampling module, and diagnoses the temperature data to obtain temperature diagnosis information and diagnose whether the temperature data is too high.

[0051] The over-current diagnosis module is an over-current diagnosis circuit connected to the equalization current sampling module, and diagnoses the equalization current to obtain equalization current diagnosis information and diagnose whether the equalization current is too high.

[0052] Further, the second radio frequency communication module (3) and the main control module (4) are both on the main control board.

[0053] Further, the second radio frequency communication module (3) and the main control module (4) are connected through SPI signal lines.

[0054] As shown in Figure 2 , the first radio frequency communication module (2) and the second radio frequency communication module (3) perform radio frequency wireless communication, and the second radio frequency communication module (3) and the main control module (4) communicate through SPI signal lines.

[0055] The first radio frequency communication module (2) periodically sends collected information including temperature data, equalization current, over-temperature diagnosis information, and over-current diagnosis information to the second radio frequency communication module (3) in the form of radio frequency information, and the second radio frequency communication module (3) converts the received radio frequency information into SPI signals and sends them to the BMS main control module (4).

[0056] The main control module (4) includes a transceiver chip and a main control chip (main control MCU), the transceiver chip interacts with the second radio frequency communication module (3), receives the SPI signals sent by the second radio frequency communication module (3) and transmits them to the main control chip for processing by the main control chip.

[0057] In addition, the main control module also sends control signals to the first radio frequency communication module (2), the main control chip generates the control signals, the transceiver chip transmits the control signals to the second radio frequency communication module (3) through the SPI signal line, and the second radio frequency communication module (3) converts the control signals into radio frequency signals and sends them to the first radio frequency communication module (2).

[0058] For example, the control signal can be a communication speed control signal, and the first radio frequency communication module (2) receives the communication speed control signal, and the integrated micro control unit adjusts the transmission period of the radio frequency signal sent to the second radio frequency communication module (3) according to the communication speed control signal.

[0059] For example, the control signal can be a balance on and balance off control signal, the control pin BLNC of the first radio frequency communication module is connected to the control signal (control) internally through a diode D, and externally connected to the gate of an N-channel Field-Effect Transistor (NFET), the source of the NFET is connected to ground, and the drain of the NFET is connected to a balance resistor R BALANCE There is a pull-down resistor R PD One end of the pull-down resistor is connected to ground, and the other end is connected to the cathode of the diode D. If the first radio frequency communication module receives a balance off control signal, the control is low, and the NFET is equivalent to ground, so the balance circuit is off. If the first radio frequency communication module receives a balance on control signal, the control is high, and the NFET is turned on, so the balance circuit is on.

[0060] The utility model also provides a kind of battery pack, include a kind of battery management system based on radio frequency technology as described above.

[0061] The utility model also provides a kind of electric equipment, and the electric equipment includes the battery pack as described above.

[0062] The wireless BMS based on the utility model cannot see any wire harness in the battery pack. Inside the battery monomer (1), the first radio frequency communication module (2) is connected to the battery monomer by only a few short wires. Greatly improve the flexibility of battery pack design.

[0063] The above only describes the preferred embodiment of the utility model, and does not limit the implementation and protection scope of the utility model, and those skilled in the art should be able to realize that any equivalent replacement and obvious change obtained by applying the contents of the utility model specification and drawings should be included in the protection scope of the utility model.

Claims

1. A battery management system based on radio frequency technology, characterized in that, Comprising: a plurality of first radio frequency communication modules, each of the first radio frequency communication modules being connected to and fixed on a corresponding battery cell of the battery pack; a second radio frequency communication module, wirelessly connected to the first radio frequency communication modules; a main control module, connected to the second radio frequency communication module.

2. A battery management system based on radio frequency technology as claimed in claim 1, wherein, The first radio frequency communication module is fixed on the upper cover of the corresponding battery cell.

3. A battery management system based on radio frequency technology as claimed in claim 2, wherein, The first radio frequency communication module is fixed inside the upper cover of the corresponding battery cell.

4. A battery management system based on radio frequency technology as claimed in claim 1, wherein, The first radio frequency communication module is integrated with an equalized current sampling module.

5. A battery management system based on radio frequency technology as claimed in claim 1, wherein, The first radio frequency communication module is integrated with a temperature sampling module.

6. A battery management system based on radio frequency technology as claimed in claim 1, wherein, The first radio frequency communication module is integrated with an over-temperature diagnosis module and / or an over-current diagnosis module.

7. A battery management system based on radio frequency technology as claimed in claim 1, wherein, The second radio frequency communication module and the main control module are both on a main control board.

8. A battery management system based on radio frequency technology as claimed in claim 1, wherein, The second radio frequency communication module and the main control module are connected through SPI signal lines.

9. A battery pack, characterized by, A battery management system based on radio frequency technology, comprising any one of claims 1-8.

10. An electric device, characterized by The power consumption device comprises a battery pack according to claim 9.

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