A multi-channel isolated battery management system

Abstract

A kind of multi-path isolated battery management system, including battery pack, the battery pack includes first battery cell, second battery cell and third battery cell, the first battery cell, second battery cell and the third battery cell are connected in series, the first battery cell is connected with first isolated step-down module, the second battery cell is connected with second isolated step-down module, the third battery cell is connected with isolated GND module.By the comprehensive isolation design of multi-path isolated power module and each functional module, the mutual interference of power signal between different modules is effectively blocked, so that BMS can still accurately collect battery data under complex electromagnetic environment, ensure the high accuracy of battery state monitoring and management.

Description

Technical Field

[0001] This utility model relates to the field of battery management, specifically a multi-channel isolated battery management system. Background Technology

[0002] Energy storage battery packs typically consist of a large number of battery cells connected in series and parallel to meet the demands of high-voltage, high-capacity energy storage. In this process, the stability and independence of the power supply play a decisive role in the reliable operation of each functional module of the BMS. In traditional BMS (Battery Management System), each functional module is often powered by a single power supply or a non-isolated power supply. In complex electromagnetic environments, such as the strong electromagnetic interference generated by the motor of an electric vehicle or the frequent switching operations of high-power power electronic equipment in an energy storage power station, power signals between different modules are prone to crosstalk. When a functional module of the BMS fails, such as due to overcurrent or short circuit, if the power supply is not isolated, the fault may quickly spread to other modules, triggering a chain reaction and causing the entire BMS system to fail.

[0003] As battery applications become more diverse and complex, traditional power architectures struggle to flexibly adapt to newly added functional modules. This is because new modules may have different requirements for power supply voltage, current characteristics, and isolation. Non-isolated power supplies cannot meet diverse power needs, limiting the functional expansion and upgrades of the BMS.

[0004] Furthermore, in high-voltage, high-current battery systems, such as high-voltage energy storage battery packs, if the power system experiences safety issues such as leakage, the lack of isolation between the power supplies of each module may increase the risk of electric shock to operators. It may also easily lead to serious safety accidents such as thermal runaway of the battery pack, posing a huge threat to the safety of personnel and equipment. Utility Model Content

[0005] The purpose of this invention is to provide a multi-channel isolated battery management system to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: In a first aspect, this application provides a multi-channel isolated battery management system, including a battery pack, the battery pack including a first battery unit, a second battery unit and a third battery unit, the first battery unit, the second battery unit and the third battery unit being connected in series, the first battery unit being connected to a first isolation step-down module, the second battery unit being connected to a second isolation step-down module, and the third battery unit being connected to an isolation GND module; The first isolation step-down module includes a step-down chip U20, which is connected in parallel with a capacitor C73 and a resistor R141, and the capacitor C73 and the resistor R141 are connected in series. The second isolation step-down module includes a step-down chip U21, which is connected in parallel with a capacitor C103 and a resistor R227, while the capacitor C103 and the resistor R227 are connected in series. The isolation GND module includes chip U5, capacitor C66, and capacitor C68, which are connected in parallel.

[0007] In one possible implementation, the step-down chip U20 has a first VIN pin and a first EN pin. The first VIN pin is connected to the first battery cell, and the first EN pin is connected to a resistor R61, which is connected to the ground terminal.

[0008] In one possible implementation, the step-down chip U20 is further provided with a first FB pin and a SW pin, which are connected to a first step-down circuit. The first step-down circuit includes a capacitor bank consisting of capacitors C119, C120 and C148 connected in parallel. The capacitor bank is connected in series with inductor L3, and inductor L3 is connected in series with resistor R163.

[0009] In one possible implementation, the step-down chip U21 has a second VIN pin and a second EN pin. The second VIN pin is connected to the second battery cell through a resistor R160, and the second EN pin is connected to a resistor R219, which is connected to the ground terminal.

[0010] In one possible implementation, the step-down chip U21 is provided with a second FB pin, which is connected to a second step-down circuit. The second step-down circuit includes a capacitor C95 and a resistor R229 connected in parallel.

[0011] In one possible implementation, the chip U5 is provided with a third VIN pin, which is connected to the third battery cell through a resistor R81. A capacitor C61 and a capacitor C62 are also connected in parallel between the third VIN pin and the resistor R81.

[0012] Based on the same inventive concept, in a second aspect, embodiments of this application provide a battery system, including the battery management system as described in the first aspect.

[0013] Based on the same inventive concept, in a third aspect, embodiments of this application provide an electrical device including a battery system as described in any embodiment of the first aspect.

[0014] Compared with the prior art, the present invention has the following advantages: Through the comprehensive isolation design of multi-channel isolated power supply modules and various functional modules, crosstalk between power signals of different modules is effectively blocked, enabling the BMS to accurately collect battery data even in complex electromagnetic environments, ensuring a high degree of accuracy in battery status monitoring and management. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a circuit diagram of the first isolation step-down module of this utility model; Figure 3 This is a circuit diagram of the second isolation step-down module of this utility model; Figure 4 This is the circuit diagram of the isolation GND module of this utility model. Detailed Implementation

[0016] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0017] like Figure 1-4 As shown, a multi-channel isolated battery management system includes a battery pack comprising a first battery unit 1, a second battery unit 2, and a third battery unit 3. The first battery unit 1, second battery unit 2, and third battery unit 3 are connected in series. The first battery unit 1 is connected to a first isolation step-down module 4, the second battery unit 2 is connected to a second isolation step-down module 5, and the third battery unit 3 is connected to an isolation GND module 6. Each battery unit can contain several individual battery cells. For example, a battery pack with a total voltage of 51.2V can be composed of 16 3.2V lithium iron phosphate batteries connected in series. In this invention, the first isolation step-down module 4 converts the input high-voltage battery voltage of 48V-60V to a low-voltage 12V suitable for the charge / discharge control module, achieving an isolation voltage of over 3.5V, effectively preventing power interference between different modules. The second isolation step-down module 5 converts the isolated 12V power supply to a 5V output. The isolation GND module 6 further isolates the 5V battery voltage to a 5V output GND, ensuring electrical isolation.

[0018] The first isolated step-down module 4 includes a step-down chip U20, which is connected in parallel with capacitor C73 and resistor R141. Capacitor C73 and resistor R141 are connected in series. The step-down chip U20 has a first VIN pin and a first EN pin. The first VIN pin is connected to the first battery cell 1, and the first EN pin is connected to resistor R61, which is connected to ground. The step-down chip U20 also has a first FB pin and a SW pin, which are connected to a first step-down circuit. The first step-down circuit includes a capacitor bank consisting of capacitors C119, C120, and C148 connected in parallel. The capacitor bank is connected in series with inductor L3, and inductor L3 is connected in series with resistor R163. Using capacitors of different capacities connected in parallel with an inductor can stabilize the current during voltage reduction.

[0019] The second isolation step-down module 5 includes a step-down chip U21, which is connected in parallel with capacitor C103 and resistor R227. Capacitor C103 and resistor R227 are connected in series. The series connection of the capacitor and resistor can protect the circuit while reducing the voltage. The step-down chip U21 has a second VIN pin and a second EN pin. The second VIN pin is connected to the second battery cell 2 through resistor R160, and the second EN pin is connected to resistor R219, which is connected to the ground terminal. The step-down chip U21 also has a second FB pin, which is connected to a second step-down circuit. The second step-down circuit includes capacitor C95 and resistor R229 connected in parallel.

[0020] The isolation GND module 6 includes a chip U5, a capacitor C66, and a capacitor C68, which are connected in parallel. The chip U5 has a third VIN pin, which is connected to the third battery unit 3 through a resistor R81. The third VIN pin and the resistor R81 are also connected in series with capacitors C61 and C62, which are connected in parallel.

[0021] This invention features a comprehensive isolation design for each functional module, effectively blocking crosstalk between power signals from different modules. This allows the BMS to accurately collect battery data even in complex electromagnetic environments, ensuring a high degree of accuracy in battery status monitoring and management. Different isolation modules are used for voltage reduction to meet varying voltage requirements, with each module powered independently. This ensures that a failure in one functional module will not affect the normal operation of other modules, significantly improving the reliability of the BMS system.

[0022] Based on the same inventive concept, embodiments of this application also provide a battery system, including the aforementioned multi-channel isolated battery management system. It is understood that the battery system possesses the beneficial effects of the multi-channel isolated battery management system provided in these embodiments; specific details regarding the multi-channel isolated battery management system can be found in the above embodiments, and will not be repeated here.

[0023] Based on the same inventive concept, this application also provides an electrical device. The electrical device includes the aforementioned battery system. It is understood that the electrical device has the beneficial effects of the battery management system provided in the embodiments of this application. For details, please refer to the specific descriptions of the multi-channel isolated battery management system in the above embodiments, which will not be repeated here.

[0024] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", "left and right", "front and back", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A multi-channel isolated battery management system, characterized in that, The battery pack includes a first battery unit, a second battery unit, and a third battery unit, which are connected in series. The first battery unit is connected to a first isolation step-down module, the second battery unit is connected to a second isolation step-down module, and the third battery unit is connected to an isolation GND module. The first isolation step-down module includes a step-down chip U20, which is connected in parallel with a capacitor C73 and a resistor R141, and the capacitor C73 and the resistor R141 are connected in series. The second isolation step-down module includes a step-down chip U21, which is connected in parallel with a capacitor C103 and a resistor R227, while the capacitor C103 and the resistor R227 are connected in series. The isolation GND module includes chip U5, capacitor C66, and capacitor C68, which are connected in parallel.

2. The multi-channel isolated battery management system according to claim 1, characterized in that, The step-down chip U20 has a first VIN pin and a first EN pin. The first VIN pin is connected to the first battery cell, and the first EN pin is connected to a resistor R61. The resistor R61 is connected to the ground terminal.

3. The multi-channel isolated battery management system according to claim 2, characterized in that, The step-down chip U20 is also provided with a first FB pin and a SW pin. The first FB pin and the SW pin are connected to a first step-down circuit. The first step-down circuit includes a capacitor group consisting of capacitors C119, C120 and C148 connected in parallel. The capacitor group is connected in series with inductor L3. Inductor L3 is connected in series with resistor R163.

4. The multi-channel isolated battery management system according to claim 1, characterized in that, The step-down chip U21 has a second VIN pin and a second EN pin. The second VIN pin is connected to the second battery cell through a resistor R160, and the second EN pin is connected to a resistor R219. The resistor R219 is connected to the ground terminal.

5. The multi-channel isolated battery management system according to claim 4, characterized in that, The step-down chip U21 has a second FB pin, which is connected to a second step-down circuit. The second step-down circuit includes a capacitor C95 and a resistor R229 connected in parallel.

6. The multi-channel isolated battery management system according to claim 1, characterized in that, The chip U5 has a third VIN pin, which is connected to the third battery unit through a resistor R81. A capacitor C61 and a capacitor C62 are connected in parallel between the third VIN pin and the resistor R81.

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