Battery management system of two-way communication architecture and electronic equipment

Abstract

The utility model relates to a battery management system with a two-way communication architecture and electronic equipment. The system comprises a first controller; the first end of the control circuit is electrically connected with the first end of the first controller; the battery connecting end of the charging and discharging circuit is electrically connected with the second end of the control circuit, the load connecting end of the charging and discharging circuit is electrically connected with the third end of the control circuit, and the control end of the charging and discharging circuit is in communication connection with the second end of the first controller; wherein when the system is in a battery charging mode, the first controller outputs a first control signal to the control end of the charging and discharging circuit and controls the second end of the control circuit to be conducted; and when the system is in a battery discharging mode, the first controller outputs a second control signal to the control end of the charging and discharging circuit and controls the third end of the control circuit to be conducted.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and more specifically, to a battery management system and electronic device with a two-way communication architecture. Background Technology

[0002] With the rapid development of batteries, charging and discharging efficiency have received widespread attention. Existing battery management systems can be equipped with control chips that can control the conversion efficiency of the charging and discharging circuits to achieve battery charging or discharging. However, control chips typically collect data on the battery's voltage or charge level to determine the conversion efficiency of the charging and discharging circuits, which results in relatively low accuracy of the determined conversion efficiency. Utility Model Content

[0003] One objective of this invention is to provide a battery management system and electronic device with a two-way communication architecture.

[0004] According to one aspect of the present invention, a battery management system with a two-way communication architecture is provided, the system comprising:

[0005] First controller;

[0006] Control circuit, wherein the first terminal of the control circuit is electrically connected to the first terminal of the first controller;

[0007] A charging and discharging circuit, wherein the battery connection terminal of the charging and discharging circuit is electrically connected to the second terminal of the control circuit, the load connection terminal of the charging and discharging circuit is electrically connected to the third terminal of the control circuit, and the control terminal of the charging and discharging circuit is communicatively connected to the second terminal of the first controller.

[0008] When the system is in battery charging mode, the first controller outputs a first control signal to the control terminal of the charging and discharging circuit and controls the second terminal of the control circuit to be turned on; when the system is in battery discharging mode, the first controller outputs a second control signal to the control terminal of the charging and discharging circuit and controls the third terminal of the control circuit to be turned on.

[0009] Optionally, the control circuit includes a first switching circuit and a second switching circuit;

[0010] Wherein, the first terminal of the first switch circuit is electrically connected to the battery connection terminal of the charging and discharging circuit, the first terminal of the second switch circuit is electrically connected to the load connection terminal of the charging and discharging circuit, the connection point between the second terminal of the first switch circuit and the second terminal of the second switch circuit is electrically connected to the first terminal of the first controller, the third terminal of the first switch circuit is communicatively connected to the third terminal of the first controller, and the third terminal of the second switch circuit is communicatively connected to the fourth terminal of the first controller.

[0011] When the system is in battery charging mode, the first controller outputs a first control signal to the control terminal of the charging and discharging circuit and outputs a first conduction signal to the third terminal of the first switching circuit; when the system is in battery discharging mode, the first controller outputs a second control signal to the control terminal of the charging and discharging circuit and outputs a second conduction signal to the third terminal of the second switching circuit.

[0012] Optionally, the first switching circuit includes a first resistor and a first switching transistor. The first end of the first resistor is electrically connected to the battery connection terminal of the charging and discharging circuit. The second end of the first resistor is connected to the first end of the first switching transistor. The second end of the first switching transistor is electrically connected to the first end of the first controller. The third end of the first switching transistor is communicatively connected to the third end of the first controller.

[0013] The second switching circuit includes a second resistor and a second switching transistor. The first end of the second resistor is electrically connected to the load connection terminal of the charging and discharging circuit. The second end of the second resistor is connected to the first end of the second switching transistor. The second end of the second switching transistor is electrically connected to the first end of the first controller. The third end of the second switching transistor is communicatively connected to the fourth end of the first controller.

[0014] Optionally, the first switch and the second switch are MOSFETs.

[0015] Optionally, the charging and discharging circuit includes a first conversion circuit, an isolation circuit, and a second conversion circuit;

[0016] Wherein, the first end of the first conversion circuit serves as the battery connection end of the charging and discharging circuit, the second end of the first conversion circuit is connected to the first end of the isolation circuit, the second end of the isolation circuit is connected to the first end of the second conversion circuit, and the second end of the second conversion circuit serves as the load connection end of the charging and discharging circuit.

[0017] Optionally, the first conversion circuit includes a first bridge arm and a second bridge arm, the upper bridge arm connection point of the first bridge arm and the second bridge arm serves as the first positive terminal of the first conversion circuit, the lower bridge arm connection point of the first bridge arm and the second bridge arm serves as the first negative terminal of the first conversion circuit, the midpoint of the first bridge arm serves as the second positive terminal of the first conversion circuit, and the midpoint of the second bridge arm serves as the second negative terminal of the first conversion circuit.

[0018] The second conversion circuit includes a third bridge arm and a fourth bridge arm. The upper bridge arm connection point of the third bridge arm and the fourth bridge arm serves as the second positive terminal of the second conversion circuit, the lower bridge arm connection point of the third bridge arm and the fourth bridge arm serves as the second negative terminal of the second conversion circuit, the midpoint of the third bridge arm serves as the first positive terminal of the second conversion circuit, and the midpoint of the fourth bridge arm serves as the first negative terminal of the second conversion circuit.

[0019] Optionally, the isolation circuit includes a first resonant circuit, a transformer, and a second resonant circuit;

[0020] The first resonant circuit is disposed between the first conversion circuit and the transformer, and the second resonant circuit is disposed between the second conversion circuit and the transformer.

[0021] Optionally, the system further includes a second controller, which is communicatively connected to the first controller;

[0022] When the second terminal of the control circuit is turned on, the first controller receives a first current signal and sends the first current signal to the second controller. The second controller receives the first current signal and controls the first controller to adjust the output of the first control signal. When the third terminal of the control circuit is turned on, the first controller receives a second current signal and sends the second current signal to the second controller. The second controller receives the second current signal and controls the first controller to adjust the output of the second control signal.

[0023] Optionally, the first controller includes a first communication module, and the first controller communicates with the second controller through the first communication module.

[0024] According to one aspect of the present invention, an electronic device is provided, the electronic device comprising a battery management system with a bidirectional communication architecture as described in the first aspect.

[0025] One technical advantage of this invention is that, in the battery management system with this bidirectional communication architecture, when the battery is in charging mode, the first controller outputs a first control signal to the control terminal of the charging / discharging circuit and controls the second terminal of the control circuit to conduct, enabling the first controller to determine the current at the battery connection terminal of the charging / discharging circuit; when the battery is in discharging mode, the first controller outputs a second control signal to the control terminal of the charging / discharging circuit and controls the third terminal of the control circuit to conduct, enabling the first controller to determine the current at the load connection terminal of the charging / discharging circuit. Thus, the first controller can obtain the current at the battery connection terminal and the load connection terminal, and can then combine the current at the battery connection terminal and the load connection terminal to determine the conversion efficiency of the charging / discharging circuit, effectively improving the accuracy of determining the conversion efficiency.

[0026] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0027] The accompanying drawings, which form part of this specification, illustrate embodiments of the present invention and, together with the specification, serve to explain the principles of the present invention.

[0028] Figure 1 This is a structural block diagram of the battery management system with a bidirectional communication architecture in the embodiments of this application;

[0029] Figure 2 This is a circuit diagram of the battery management system with a bidirectional communication architecture according to an embodiment of this application. Detailed Implementation

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0032] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0033] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0035] Figure 1 This is a structural block diagram of a battery management system with a bidirectional communication architecture according to an embodiment of this application. Figure 1 As shown, the system includes a first controller U1, a control circuit 2, and a charging / discharging circuit 1.

[0036] The first terminal of the control circuit 2 is electrically connected to the first terminal of the first controller U1;

[0037] The battery connection terminal of the charging and discharging circuit 1 is electrically connected to the second terminal of the control circuit 2, the load connection terminal of the charging and discharging circuit 1 is electrically connected to the third terminal of the control circuit 2, and the control terminal of the charging and discharging circuit 1 is communicatively connected to the second terminal of the first controller U1.

[0038] Specifically, when the system is in the charging mode of battery 10, the first controller U1 outputs a first control signal to the control terminal of the charging and discharging circuit 1 and controls the second terminal of the control circuit 2 to be turned on; when the system is in the discharging mode of battery 10, the first controller U1 outputs a second control signal to the control terminal of the charging and discharging circuit 1 and controls the third terminal of the control circuit 2 to be turned on.

[0039] In this embodiment, the first controller U1 can be a BMS chip, and it has functions such as digital-to-analog conversion and signal transmission / reception. The first control signal output by the first controller U1 to the control terminal of the charging / discharging circuit 1 can be a PWM signal, and the charging / discharging circuit 1 can change its conversion efficiency in response to this PWM signal. The second control signal output by the first controller U1 to the control terminal of the charging / discharging circuit 1 can also be a PWM signal, and the charging / discharging circuit 1 can change its conversion efficiency in response to this PWM signal. The conversion efficiency of the charging / discharging circuit 1 can be adjusted by changing the duty cycle of the PWM signal.

[0040] In this embodiment, the conduction of the second terminal of the control circuit 2 can be considered as the charging / discharging circuit 1 feeding back the current signal of its battery connection terminal to the first controller U1 through the second terminal of the control circuit 2. Similarly, the conduction of the third terminal of the control circuit 2 can be considered as the charging / discharging circuit 1 feeding back the current signal of its load connection terminal to the first controller U1 through the third terminal of the control circuit 2. In other words, when the system is in the charging mode of battery 10, the control circuit 2 can determine the current input from the charging / discharging circuit 1 to battery 10, and when the system is in the discharging mode of battery 10, the control circuit 2 can determine the current input from the charging / discharging circuit 1 to load 20.

[0041] In this embodiment, the load connection terminal is used to connect the load 20, which can be an electrical device or a power supply device, and the battery connection terminal is used to connect the battery 10.

[0042] In other words, the battery management system of this bidirectional communication architecture can, when the battery 10 is in charging mode, output a first control signal to the control terminal of the charging / discharging circuit 1 and control the second terminal of the control circuit 2 to conduct, so that the first controller U1 determines the current of the battery connection terminal of the charging / discharging circuit 1; when the battery 10 is in discharging mode, the first controller U1 outputs a second control signal to the control terminal of the charging / discharging circuit 1 and controls the third terminal of the control circuit 2 to conduct, so that the first controller U1 determines the current of the load connection terminal of the charging / discharging circuit 1. Thus, the first controller U1 can obtain the current of the battery connection terminal and the load connection terminal, and then combine the current of the battery connection terminal and the load connection terminal to determine the conversion efficiency of the charging / discharging circuit 1, effectively improving the accuracy of determining the conversion efficiency.

[0043] In some embodiments, in order to reduce the overhead of the first controller U1, the system further includes a second controller U2, which is communicatively connected to the first controller U1.

[0044] When the second terminal of the control circuit 2 is turned on, the first controller U1 receives the first current signal and sends the first current signal to the second controller U2. The second controller U2 receives the first current signal and controls the first controller U1 to adjust the output first control signal. When the third terminal of the control circuit 2 is turned on, the first controller U1 receives the second current signal and sends the second current signal to the second controller U2. The second controller U2 receives the second current signal and controls the first controller U1 to adjust the output second control signal.

[0045] In this embodiment, the second controller U2 may be a BMS chip, and the second controller U2 has functions such as signal transmission and reception and signal processing, so that the second controller U2 can receive the first current signal sent by the first controller U1, and determine the duty cycle that the charging and discharging circuit 1 needs to adjust to reach the set conversion efficiency and feed it back to the first controller U1. The first controller U1 can obtain the duty cycle, so that the first controller U1 outputs a first control signal or a second control signal that reflects the duty cycle, so as to control the first controller U1 to adjust the output first control signal or the second control signal.

[0046] In some embodiments, in order to enable communication interaction between the first controller U1 and the second controller U2, the first controller U1 includes a first communication module, and the first controller U1 communicates with the second controller U2 through the first communication module.

[0047] In this embodiment, the first communication module may be RS485 to enable communication between the first controller U1 and the second controller U2.

[0048] In some embodiments, in order to receive the current from the battery connection terminal and the load connection terminal of the charging and discharging circuit 1 using the same interface of the first controller U1, the control circuit 2 includes a first switching circuit and a second switching circuit.

[0049] Wherein, the first terminal of the first switch circuit is electrically connected to the battery connection terminal of the charging and discharging circuit 1, the first terminal of the second switch circuit is electrically connected to the load connection terminal of the charging and discharging circuit 1, the connection point between the second terminals of the first switch circuit and the second terminal of the second switch circuit is electrically connected to the first terminal of the first controller U1, the third terminal of the first switch circuit is communicatively connected to the third terminal of the first controller U1, and the third terminal of the second switch circuit is communicatively connected to the fourth terminal of the first controller U1.

[0050] When the system is in the charging mode of battery 10, the first controller U1 outputs a first control signal to the control terminal of the charging and discharging circuit 1 and outputs a first conduction signal to the third terminal of the first switching circuit; when the system is in the discharging mode of battery 10, the first controller U1 outputs a second control signal to the control terminal of the charging and discharging circuit 1 and outputs a second conduction signal to the third terminal of the second switching circuit.

[0051] In some embodiments, such as Figure 2 As shown, the first switching circuit includes a first resistor R1 and a first switching transistor Q1. The first end of the first resistor R1 is electrically connected to the battery connection terminal of the charging and discharging circuit 1. The second end of the first resistor R1 is connected to the first end of the first switching transistor Q1. The second end of the first switching transistor Q1 is electrically connected to the first end of the first controller U1. The third end of the first switching transistor Q1 is communicatively connected to the third end of the first controller U1.

[0052] The second switching circuit includes a second resistor R2 and a second switching transistor Q2. The first end of the second resistor R2 is electrically connected to the load connection terminal of the charging and discharging circuit 1. The second end of the second resistor R2 is connected to the first end of the second switching transistor Q2. The second end of the second switching transistor Q2 is electrically connected to the first end of the first controller U1. The third end of the second switching transistor Q2 is communicatively connected to the fourth end of the first controller U1.

[0053] In some embodiments, the first switch Q1 and the second switch Q2 are MOSFETs.

[0054] In this embodiment, the first end of the first resistor R1 is connected to the source of the tenth switch Q10, and the first end of the second resistor R1 is connected to the source of the fourth switch Q4.

[0055] In this embodiment, the first terminal of the first switch Q1 is the source, the second terminal of the first switch Q1 is the drain, and the third terminal of the first switch Q1 is the gate. The first controller U1 can turn on the first switch Q1 by outputting a high level to the gate of the first switch Q1, so as to feed back the acquired signal representing the current at the battery connection terminal to the first controller U1.

[0056] The first terminal of the second switch Q2 is the source, the second terminal is the drain, and the third terminal is the gate. The first controller U1 can turn on the second switch Q2 by outputting a high level to the gate of the second switch Q2, so as to feed back the acquired signal representing the current at the load connection terminal to the first controller U1.

[0057] In some embodiments, in order to achieve charging and discharging of the battery 10 without damaging the battery 10, the charging and discharging circuit 1 includes a first conversion circuit, an isolation circuit, and a second conversion circuit.

[0058] In this circuit, the first terminal of the first conversion circuit serves as the battery connection terminal of the charging and discharging circuit 1, the second terminal of the first conversion circuit is connected to the first terminal of the isolation circuit, the second terminal of the isolation circuit is connected to the first terminal of the second conversion circuit, and the second terminal of the second conversion circuit serves as the load connection terminal of the charging and discharging circuit 1.

[0059] In this embodiment, the first conversion circuit is a DC-AC conversion circuit, and the second conversion circuit is an AC-DC conversion circuit.

[0060] In some embodiments, in order to achieve DC-DC conversion of the charging / discharging circuit 1, such as Figure 2 As shown, the first conversion circuit includes a first bridge arm and a second bridge arm. The connection point of the upper bridge arm of the first bridge arm and the second bridge arm serves as the first positive terminal of the first conversion circuit, the connection point of the lower bridge arm of the first bridge arm and the second bridge arm serves as the first negative terminal of the first conversion circuit, the midpoint of the first bridge arm serves as the second positive terminal of the first conversion circuit, and the midpoint of the second bridge arm serves as the second negative terminal of the first conversion circuit.

[0061] The second conversion circuit includes a third bridge arm and a fourth bridge arm. The connection point of the upper bridge arm of the third bridge arm and the fourth bridge arm serves as the second positive terminal of the second conversion circuit, the connection point of the lower bridge arm of the third bridge arm and the fourth bridge arm serves as the second negative terminal of the second conversion circuit, the midpoint of the third bridge arm serves as the first positive terminal of the second conversion circuit, and the midpoint of the fourth bridge arm serves as the first negative terminal of the second conversion circuit.

[0062] In this embodiment, the first bridge arm consists of the ninth switch Q9 and the tenth switch Q10, the second bridge arm consists of the seventh switch Q7 and the eighth switch Q8, the third bridge arm consists of the fifth switch Q5 and the sixth switch Q6, and the fourth bridge arm consists of the third switch Q3 and the fourth switch Q4. Furthermore, all switches Q3 through Q10 are MOSFETs, and their gates are communicatively connected to the first controller U1. The connection point between the drain of the ninth switch Q9 and the drain of the seventh switch Q7 serves as the upper bridge arm connection point of the first and second bridge arms. The connection point between the source of the tenth switch Q10 and the source of the eighth switch Q8 serves as the lower bridge arm connection point of the first and second bridge arms. The midpoint of the first bridge arm is the connection point between the source of the ninth switch Q9 and the drain of the tenth switch Q10, and the midpoint of the second bridge arm is the connection point between the source of the seventh switch Q7 and the drain of the eighth switch Q8. The connection point between the drain of the fifth switch Q5 and the drain of the third switch Q3 serves as the upper bridge arm connection point of the third and fourth bridge arms. The connection point between the source of the sixth switch Q6 and the source of the fourth switch Q4 serves as the lower bridge arm connection point of the third and fourth bridge arms. The midpoint of the third bridge arm is the connection point between the source of the fifth switch Q5 and the drain of the sixth switch Q6, and the midpoint of the fourth bridge arm is the connection point between the source of the third switch Q3 and the drain of the fourth switch Q4. When the charging / discharging circuit 1 is working, the third switch Q3, the sixth switch Q6, the seventh switch Q7, and the tenth switch Q10 form the first group of switches, and the fourth switch Q4, the fifth switch Q5, the eighth switch Q8, and the ninth switch Q9 form the second group of switches. These two groups of switches are alternately turned on to achieve DC-DC conversion of the charging / discharging circuit 1.

[0063] In some embodiments, in order to improve the stability of the output AC power, such as Figure 2 As shown, the isolation circuit includes a first resonant circuit, a transformer, and a second resonant circuit.

[0064] The first resonant circuit is located between the first conversion circuit and the transformer, and the second resonant circuit is located between the second conversion circuit and the transformer.

[0065] In this embodiment, the first resonant circuit includes a first inductor L1 and a first capacitor C1. The first end of the first inductor L1 is connected to the midpoint of the third bridge arm, the second end of the first inductor L1 is connected to the first end of the primary coil of the transformer, the first end of the first capacitor C1 is connected to the midpoint of the fourth bridge arm, and the second end of the first capacitor C1 is connected to the second end of the primary coil of the transformer.

[0066] In this embodiment, the second resonant circuit includes a second inductor L2 and a second capacitor C2. The first end of the second inductor L2 is connected to the midpoint of the second bridge arm, the second end of the second inductor L2 is connected to the first end of the secondary coil of the transformer, the first end of the second capacitor C2 is connected to the midpoint of the first bridge arm, and the second end of the second capacitor C2 is connected to the second end of the secondary coil of the transformer.

[0067] An electronic device according to an embodiment of this application includes a battery management system with a bidirectional communication architecture as described in any of the above embodiments.

[0068] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery management system with a bidirectional communication architecture, characterized in that, The system includes: First controller; Control circuit, wherein the first terminal of the control circuit is electrically connected to the first terminal of the first controller; A charging and discharging circuit, wherein the battery connection terminal of the charging and discharging circuit is electrically connected to the second terminal of the control circuit, the load connection terminal of the charging and discharging circuit is electrically connected to the third terminal of the control circuit, and the control terminal of the charging and discharging circuit is communicatively connected to the second terminal of the first controller. When the system is in battery charging mode, the first controller outputs a first control signal to the control terminal of the charging and discharging circuit and controls the second terminal of the control circuit to be turned on; when the system is in battery discharging mode, the first controller outputs a second control signal to the control terminal of the charging and discharging circuit and controls the third terminal of the control circuit to be turned on; the control circuit includes a first switching circuit and a second switching circuit. Wherein, the first terminal of the first switch circuit is electrically connected to the battery connection terminal of the charging and discharging circuit, the first terminal of the second switch circuit is electrically connected to the load connection terminal of the charging and discharging circuit, the connection point between the second terminal of the first switch circuit and the second terminal of the second switch circuit is electrically connected to the first terminal of the first controller, the third terminal of the first switch circuit is communicatively connected to the third terminal of the first controller, and the third terminal of the second switch circuit is communicatively connected to the fourth terminal of the first controller. When the system is in battery charging mode, the first controller outputs a first control signal to the control terminal of the charging and discharging circuit and a first conduction signal to the third terminal of the first switching circuit; when the system is in battery discharging mode, the first controller outputs a second control signal to the control terminal of the charging and discharging circuit and a second conduction signal to the third terminal of the second switching circuit; the first switching circuit includes a first resistor and a first switching transistor, the first terminal of the first resistor is electrically connected to the battery connection terminal of the charging and discharging circuit, the second terminal of the first resistor is connected to the first terminal of the first switching transistor, the second terminal of the first switching transistor is electrically connected to the first terminal of the first controller, and the third terminal of the first switching transistor is communicatively connected to the third terminal of the first controller; The second switching circuit includes a second resistor and a second switching transistor. The first end of the second resistor is electrically connected to the load connection terminal of the charging and discharging circuit. The second end of the second resistor is connected to the first end of the second switching transistor. The second end of the second switching transistor is electrically connected to the first end of the first controller. The third end of the second switching transistor is communicatively connected to the fourth end of the first controller.

2. The system according to claim 1, characterized in that, The first switch and the second switch are MOSFETs.

3. The system according to claim 1, characterized in that, The charging and discharging circuit includes a first conversion circuit, an isolation circuit, and a second conversion circuit. Wherein, the first end of the first conversion circuit serves as the battery connection end of the charging and discharging circuit, the second end of the first conversion circuit is connected to the first end of the isolation circuit, the second end of the isolation circuit is connected to the first end of the second conversion circuit, and the second end of the second conversion circuit serves as the load connection end of the charging and discharging circuit.

4. The system according to claim 3, characterized in that, The first conversion circuit includes a first bridge arm and a second bridge arm. The upper bridge arm connection point of the first bridge arm and the second bridge arm serves as the first positive terminal of the first conversion circuit, the lower bridge arm connection point of the first bridge arm and the second bridge arm serves as the first negative terminal of the first conversion circuit, the midpoint of the first bridge arm serves as the second positive terminal of the first conversion circuit, and the midpoint of the second bridge arm serves as the second negative terminal of the first conversion circuit. The second conversion circuit includes a third bridge arm and a fourth bridge arm. The upper bridge arm connection point of the third bridge arm and the fourth bridge arm serves as the second positive terminal of the second conversion circuit, the lower bridge arm connection point of the third bridge arm and the fourth bridge arm serves as the second negative terminal of the second conversion circuit, the midpoint of the third bridge arm serves as the first positive terminal of the second conversion circuit, and the midpoint of the fourth bridge arm serves as the first negative terminal of the second conversion circuit.

5. The system according to claim 4, characterized in that, The isolation circuit includes a first resonant circuit, a transformer, and a second resonant circuit. The first resonant circuit is disposed between the first conversion circuit and the transformer, and the second resonant circuit is disposed between the second conversion circuit and the transformer.

6. The system according to any one of claims 1 to 5, characterized in that, The system further includes a second controller, which is communicatively connected to the first controller; When the second terminal of the control circuit is turned on, the first controller receives a first current signal and sends the first current signal to the second controller. The second controller receives the first current signal and controls the first controller to adjust the output of the first control signal. When the third terminal of the control circuit is turned on, the first controller receives a second current signal and sends the second current signal to the second controller. The second controller receives the second current signal and controls the first controller to adjust the output of the second control signal.

7. The system according to claim 6, characterized in that, The first controller includes a first communication module, and the first controller communicates with the second controller through the first communication module.

8. An electronic device, characterized in that, The electronic device includes a battery management system with a bidirectional communication architecture as described in any one of claims 1 to 7.

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