CN219918452U

CN219918452U - Battery management system

Info

Publication number: CN219918452U
Application number: CN202320943631.1U
Authority: CN
Inventors: 彭宏伟
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2023-04-23
Filing date: 2023-04-23
Publication date: 2023-10-27
Anticipated expiration: 2033-04-23

Abstract

The embodiment of the utility model discloses a battery management system, which comprises: the main control module is provided with a first Bluetooth module; the monitoring modules are provided with second Bluetooth modules; each monitoring module is used for monitoring the battery cell, the main control module and each monitoring module are in wireless communication through the first Bluetooth module and the second Bluetooth module, the number of wire harnesses and connectors between the main control module and each monitoring module is reduced, standardized batch production is easy, expandability is good, failure risk of a battery is reduced, the weight of a battery box is reduced, accordingly, battery arrangement design is flexible and simple, a battery pack structure can be compactly designed, energy density of the battery is improved, and meanwhile automatic production is easier.

Description

Battery management system

Technical Field

The present utility model relates to the field of battery management technologies, and in particular, to a battery management system.

Background

The battery management system (Battery Management System, BMS) monitors and guarantees the safety and robustness of the battery pack by acquiring the information of the whole battery pack, and has an indispensable function of prolonging the service life of the battery system, improving the battery efficiency and ensuring the safety of a vehicle.

The battery management system generally comprises a main control module and a plurality of monitoring modules, wherein the main control module is used for collecting sampling information from each slave board, communicating with the whole vehicle through a low-voltage electric interface, and controlling the relay in the BDU to act so as to monitor each state of the battery, thereby ensuring the safe use of the battery in the charging and discharging processes; the monitoring module monitors information such as the cell voltage, the cell temperature and the like of the battery module and transmits the information to the main board. However, the main control module and the monitoring module in the existing battery management system are generally connected in a wired manner, so that various leads are densely distributed in the battery box, the production and the assembly are complicated, the use safety is low, the potential safety hazard can be increased due to the large number of the leads, and the risk of short circuit is greatly increased.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a battery management system which can greatly reduce the wire harness and the connector in the battery box, reduce the failure risk of the battery and lighten the weight of the battery box.

The embodiment of the utility model provides a battery management system, which comprises:

the main control module is provided with a first Bluetooth module;

the monitoring modules are provided with second Bluetooth modules;

each monitoring module is used for monitoring the battery cell, and the main control module and each monitoring module are in wireless communication with each other through the first Bluetooth module and the second Bluetooth module.

Further, in the battery management system, each monitoring module is configured to individually monitor the cells in one battery pack.

Further, in the battery management system, the monitoring module is further provided with a PA module, and the PA module is used for enhancing the wireless signal of the second bluetooth module.

Further, in the battery management system, the battery management system further includes a switch, and the switch is used for controlling the PA module to be opened and closed.

Further, in the battery management system, the switch is a remote controlled switch.

Further, in the battery management system, the switch is connected to a voltage source, and the voltage source is used for supplying power to the PA module.

Furthermore, in the battery management system, the voltage source is an ac voltage source, and the switch and the PA module are provided with an isolation module.

Further, in the battery management system, the voltage source supplies power to the PA module when the switch is closed; and when the switch is disconnected, the battery cell supplies power to the PA module.

Further, in the battery management system, the first bluetooth module and the second bluetooth module are bluetooth modules of the same model.

Further, in the battery management system, an LE power control protocol is adopted between the first bluetooth module and the second bluetooth module to realize wireless communication.

According to the battery management system provided by the utility model, the first Bluetooth module is arranged on the main control module, the second Bluetooth module is arranged on each monitoring module, each monitoring module is used for monitoring the battery cell, the main control module and each monitoring module can realize wireless communication through the first Bluetooth module and the second Bluetooth module, so that the number of wire harnesses and connectors between the main control module and each monitoring module is reduced, the standardized batch production is easy, the expandability is good, the failure risk of a battery is reduced, and the weight of a battery box is reduced, so that the battery arrangement design is more flexible and simpler, the battery pack structure can be compactly designed, the energy density of the battery is improved, and meanwhile, the automatic production is easier.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a battery management system according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a battery management system according to an embodiment of the present utility model;

fig. 3 is a circuit diagram of a first bluetooth module and a second bluetooth module according to an embodiment of the present utility model;

fig. 4 is another circuit diagram of the first bluetooth module and the second bluetooth module according to the embodiment of the utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

As analyzed by the background art of the present utility model, the main control module 10 and the monitoring module 20 in the existing battery management system are usually connected by a wire, which results in complicated production and assembly of the battery box and poor safety.

Referring to fig. 1, fig. 1 is a schematic diagram of a battery management system according to an embodiment of the utility model.

As shown in fig. 1, a battery management system includes:

the main control module 10 is provided with a first Bluetooth module 101;

the monitoring modules 20 are provided with a second Bluetooth module 201;

each monitoring module 20 is configured to monitor an electrical core, and wireless communication is implemented between the main control module 10 and each monitoring module 20 through the first bluetooth module 101 and the second bluetooth module 201.

In this embodiment, the master control module 10, that is, the main board in the battery management system, is electrically connected with the first bluetooth module 101, the monitoring module 20, that is, the slave board in the battery management system, and each battery module in the battery management system may be correspondingly provided with a monitoring module 20 to monitor the voltage, the state of charge, the current and the like in the corresponding battery module, where the monitoring module 20 sends the monitored data to the master control module 10 by using the first bluetooth module 101 and the second bluetooth module 201 as connection channels, and after receiving the corresponding data, the master control module 10 performs corresponding analysis, thereby implementing management on each battery module.

According to the battery management system provided by the utility model, the first Bluetooth module 101 is arranged on the main control module 10, the second Bluetooth module 201 is arranged on each monitoring module 20, each monitoring module 20 is used for monitoring the battery cell, and the main control module 10 and each monitoring module 20 can realize wireless communication through the first Bluetooth module 101 and the second Bluetooth module 201, so that the number of wire harnesses and connectors between the main control module 10 and each monitoring module 20 is reduced, the standardized batch production is easy, the expandability is good, the failure risk of a battery is reduced, the weight of a battery box is reduced, the battery arrangement design is more flexible and simple, the compact design of a battery pack structure can be realized, the energy density of the battery is further improved, and meanwhile, the automatic production is easier. In addition, single-hop communication can be performed between each monitoring module 20 and the main control module 10, data transmission does not need to be relayed, the problem of uncontrollable time delay and unpredictable data throughput are avoided, and meanwhile the problem of uneven battery power consumption of different nodes is avoided.

It should be noted that, each monitoring module 20 in the battery management system provided by the present utility model may be provided with the second bluetooth module 201, or may be partially provided with the second bluetooth module 201, that is, the number of the second bluetooth modules 201 in the battery management system may be selected according to practical applications, which is not limited in this embodiment specifically.

It should be further noted that, the first bluetooth module 101 and the second bluetooth module 201 may be bluetooth modules with the same model, or may be bluetooth modules with different models, which may be specifically selected according to practical applications, and the embodiment is not limited specifically.

In some embodiments, the first bluetooth module 101 and the second bluetooth module 201 may be bluetooth modules of the same model. Specifically, the first bluetooth module 101 and the second bluetooth module 201 may be bluetooth modules with 5.2 specifications, such as EFR32BG24, EFR32xG24, EFR32MG2, etc., and only requires very low energy wireless signals, EMC/EMI is easy to process, and each node in the battery pack has low consumable electrode and high consistency. Wherein, the Bluetooth module of EFR32xG24 model internally comprisesThe highest running frequency can reach 78.0MHz, the Flash memory on the chip is up to 1536kB, the RAM is up to 256kB, a large amount of resources are provided for the development of wireless software protocols and upper application software of a battery management system, meanwhile, the memory space of 1.5MB Flash/256K RAM can be supported maximally, more I/O is provided, high-precision 20bit ADC sampling can be realized, and the memory space can be used as AI (artificial intelligence)/ML (machine learning) hardware accelerationA transmitter, which additionally has a transmit power of up to +19.5 dBm. In addition, it also provides industry-leading power consumption performance, which can emit current of only 19.1mA at 10dBm of emission power, and current consumption of 4.4mA at 1Mbps GFSK reception state. Meanwhile, after the Bluetooth module is combined with the EM2 state with the power consumption of only 1.3uA, the power consumption of the battery management system can be effectively reduced, and the service life of the battery is prolonged.

The choice of transmitter power setting is critical to achieving a high SIGNAL-to-NOISE RATIO (SNR) since it is underlying any bluetooth data exchange, mesh network transaction, or location services operation. The transmitter power setting is too low and the reduced SNR may result in an increased error rate. If set too high, the transmitting device not only wastes power, but its high power signal may cause communication failure by increasing interference in the multi-node network or saturating nearby receivers; the power of the transmitter is too low and although the receiver may receive the data packet from the transmitter, the Packet Error Rate (PER) may become high.

To solve the above-mentioned technical problems, in some embodiments, an LE power control protocol is adopted between the first bluetooth module 101 and the second bluetooth module 201 to implement wireless communication. Specifically, after the LE power control function is introduced into the first bluetooth module 101 and the second bluetooth module 201, the BLE device can interact with its receiver to achieve the optimal transmitter power setting, and the receiving device can use the LE power control protocol to request the compatible transmitter to change the transmit power level, so as to improve the SNR of the receiver. Also, the LE power control data may be used by the transmitter as needed to reduce the transmit power to a level that is still available to the receiver. Wherein the transmitter may independently adjust the transmit power output using a Received Signal Strength Indicator (RSSI) provided by the receiver.

In some embodiments, as shown in fig. 2, the monitoring module 20 is further provided with a PA module 202, and the PA module 202 is configured to enhance the wireless signal of the second bluetooth module 201. In particular, since a large amount of reflective material is typically present in the battery, a large amount of signal reflection occurs, resulting in a high susceptibility to interference in wireless communication between the first bluetooth module 101 and the second bluetooth module 201. To this end, the present utility model enhances the wireless signal between the first bluetooth module 101 and the second bluetooth module 201 by providing a PA module 202 in each monitoring module 20. The PA module 202 is a power amplifier electrical element, which is a key element at the transmitter end of a radio frequency and microwave system, that is, a wireless information transceiver amplifier circuit, and is used to amplify an input signal in a required frequency band and make its power reach a level required by the system.

In some embodiments, as shown in fig. 2, the battery management system further includes a switch 40, where the switch 40 is used to control the on/off of the PA module 202.

In this embodiment, by providing a switch 40 in the battery management system, the PA module 202 in each monitoring module 20 can be flexibly controlled to be opened or closed, so as to reduce the power consumption in the battery management system.

It can be understood that each PA module 202 in the battery management system may share one switch 40, or each PA module 202 may be separately provided with one switch 40, and meanwhile, the types of the switches 40 may be components such as a triode, a MOS transistor, a relay, and the like, or may be remotely controlled switches, which may be specifically selected according to practical applications, and the embodiment is not specifically limited.

In some embodiments, as shown in fig. 2, the switch 40 is a remotely controlled switch.

In the embodiment, the remote controlled switch can be remotely controlled to be on-off through wifi or NB signals, and further the on-off of power supply of the PA circuit can be controlled.

In some embodiments, as shown in fig. 2, the switch 40 is connected to a voltage source 50, and the voltage source 50 is used to power the PA module 202.

Specifically, by connecting a voltage source 50 to one end of the switch 40, the voltage source 50 can supply power to the PA module 202 in the monitoring module 20 after the switch 40 is closed, so that the power supply of the PA module 202 by a battery in the battery management system is avoided after the switch 40 is closed, and the energy consumption of the battery is reduced.

In this embodiment, the voltage source 50 powers the PA module 202 when the switch 40 is closed; when the switch 40 is open, the battery cell powers the PA module 202.

In some embodiments, as shown in fig. 2, the voltage source 50 is an ac voltage source 50, and the switch 40 and the PA module 202 are provided with an isolation module 30.

In this embodiment, the isolation module 30 may be a 3.3V DC-DC isolation power module, that is, after the voltage source 50 is converted by the isolation module 30, the PA module 202 may be provided with the 3.3V voltage source 50. The ac voltage source may be a 220V ac voltage source.

It should be noted that, the main control module 10 may also be provided with a corresponding PA module, a switch, an isolation module, etc., and the specific design thereof may be selected according to practical applications, which is not limited in this embodiment.

In some embodiments, to implement wireless communication between the first bluetooth module 101 and the second bluetooth module 201, a specific connection manner of an antenna and a wireless interface is shown in fig. 3. In the embodiment shown in fig. 3, the first bluetooth module 101 and the second bluetooth module 201 may each be of the type EFR32MG2, and the pins HFXTAL-I and HFXTAL-O thereof are respectively connected to the pin 3 and the pin 1 of the crystal oscillator X1, and the pins 2 and 4 of the crystal oscillator X1 are grounded; the pin RFVDD of the Bluetooth module is connected to the pin VDCDC of the main board or the slave board through an inductor L102 and is grounded through a capacitor C101 and a capacitor C102 respectively; the pin PAVDD of the Bluetooth module is connected to the pin PAVDD of the main board or the slave board through an inductor L103 and is grounded through a capacitor C105 and a capacitor C106 respectively; pin RFVSS of the Bluetooth module is grounded; pins RF2G4-IO of the Bluetooth module are grounded through a capacitor C1, are grounded through a capacitor C3 after being sequentially connected into an inductor L1 and a capacitor CC1, are connected with pin 1 of a UFL connector P2 through a resistor R2, are connected with an antenna AT1 through the resistor R1 and the inductor L3, are grounded through the capacitor C2, and are grounded through the capacitor C3 between the capacitor CC1 and the resistor R1.

In some embodiments, to reduce interference of high frequency such as RF signals existing between the first bluetooth module 101 and the second bluetooth module 201 and to power the first bluetooth module 101 and the second bluetooth module 201, as shown in fig. 4, the models of the first bluetooth module 101 and the second bluetooth module 201 may be EFR32MG2, and pins RESETn thereof are connected to pins EFR32- # RESET of the master board or the slave board; the pin VREGVDD of the Bluetooth module is connected with the pin VMCU of the main board or the slave board and is grounded through a capacitor C110 and a capacitor C111 respectively; the pin AVDD of the Bluetooth module is connected with the pin VMCU of the main board or the slave board and is grounded through a capacitor C112 and a capacitor C113 respectively; pin IOVDD of the Bluetooth module is connected with pin VMCU of the main board or the slave board and is grounded through capacitor C114 and capacitor C115 respectively; the pin VREGSW of the Bluetooth module is connected with the pin VDCDC of the main board or the slave board through the inductor L101, and is grounded through the inductor L101 and the capacitor C117 in sequence; the pin DVDD of the Bluetooth module is connected with the pin VDCDC of the main board or the slave board and is grounded through a capacitor C116; pin DECOUPLE of the bluetooth module is grounded through capacitor C119; the pin VREGVSS and the pin VSS-PAD of the Bluetooth module are grounded.

While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims

1. A battery management system, comprising:

the main control module is provided with a first Bluetooth module;

the system comprises a plurality of monitoring modules, a plurality of power supply modules and a plurality of power supply modules, wherein the monitoring modules are provided with a second Bluetooth module and a PA module, and the PA module is used for enhancing wireless signals of the second Bluetooth module;

2. The battery management system of claim 1 wherein each of the monitoring modules is configured to individually monitor cells in a battery pack.

3. The battery management system of claim 1, further comprising a switch for controlling the opening and closing of the PA module.

4. The battery management system of claim 3 wherein the switch is a remotely controlled switch.

5. A battery management system according to claim 3, wherein the switch is connected to a voltage source for powering the PA module.

6. The battery management system of claim 5, wherein the voltage source is an ac voltage source, and the switch and the PA module are provided with an isolation module.

7. The battery management system of claim 5 wherein the voltage source powers the PA module when the switch is closed; and when the switch is disconnected, the battery cell supplies power to the PA module.

8. The battery management system of claim 1, wherein the first bluetooth module and the second bluetooth module are bluetooth modules of the same model.

9. The battery management system of claim 1 wherein an LE power control protocol is employed between the first bluetooth module and the second bluetooth module to enable wireless communication.