Circuit system for preventing AFE hot plug failure

Abstract

The embodiment of the utility model provides a circuit system for preventing AFE hot plug failure, and belongs to the field of AFE hot plug failure prevention. The circuit system comprises an acquisition unit, an AFE unit, a communication unit, a power supply unit and a control unit. Wherein the acquisition unit is used for being connected with a battery pack so as to acquire single voltage of the battery pack; one end of the AFE unit is connected with the acquisition unit, and the AFE unit is used for preprocessing the monomer voltage; the first end of the communication unit is connected with the other end of the AFE unit; the power supply unit is connected with the second end of the communication unit and is used for pre-supplying power to the AFE unit so as to provide voltage protection; and the control unit is connected with the third end of the communication unit.

Description

Technical Field

[0001] This utility model relates to the field of preventing AFE hot-plug failure, and specifically to a circuit system for preventing AFE hot-plug failure. Background Technology

[0002] In the battery cell acquisition AFE interface circuit used in electric vehicle BMS, MLCC capacitors are commonly used to enhance the EMC capability of the AFE. However, due to the presence of ESD diodes and parasitic diodes in the AFE chip, and the random contact sequence of the connector terminals when the AFE chip connector is connected to the power battery PACK module, if a higher series number and ground terminal are connected first, the current will flow through the balancing resistor, parasitic diode, balancing resistor, and MLCC capacitor, resulting in a large instantaneous current that can burn out the AFE chip. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide a circuit system to prevent AFE hot-plug failure. This system solves the problem that when a high-number serial number and ground terminal are connected first, the current will pass through the equalization resistor, parasitic diode, equalization resistor, and MLCC capacitor, resulting in a large instantaneous current that can burn out the AFE chip.

[0004] To achieve the above objectives, this utility model provides a circuit system for preventing AFE hot-plug failure, the circuit system comprising:

[0005] The acquisition unit is used to connect to the battery pack to acquire the voltage of each individual cell in the battery pack.

[0006] An AFE unit, one end of which is connected to the acquisition unit, is used to preprocess the individual cell voltage;

[0007] A communication unit, wherein a first end of the communication unit is connected to the other end of the AFE unit;

[0008] A power supply unit, connected to the second end of the communication unit, is used to pre-supply the AFE unit to provide voltage protection;

[0009] A control unit, which is connected to the third end of the communication unit.

[0010] Optionally, there are multiple AFE units, each corresponding to a connected battery pack. The communication interfaces of adjacent AFE units are interconnected via capacitors, and the communication interfaces of the first and last AFE units are connected to the communication unit.

[0011] Optionally, the communication unit includes:

[0012] A first transformer, one end of which is connected to the other end of the first group of AFE units, and the other end of which is connected to one end of a first connector;

[0013] The second transformer, one end of which is connected to the other end of the last group of AFE units, and the other end of which is connected to one end of the second connector;

[0014] A first bridging chip, one end of which is connected to the control unit;

[0015] A second bridging chip, one end of which is connected to the control unit;

[0016] A third transformer, one end of which is connected to the other end of the first bridging chip, and the other end of which is connected to one end of a third connector;

[0017] The fourth transformer, one end of which is connected to the other end of the second bridging chip, and the other end of which is connected to one end of the fourth connector;

[0018] The fifth connector includes multiple connectors for correspondingly connecting the AFE unit and the power supply unit;

[0019] The other end of the first connector is connected to the other end of the third connector, and the other end of the second connector is connected to the other end of the fourth connector.

[0020] Optionally, each group of AFE units includes:

[0021] A first resistor, one end of which is connected to the positive pin of the acquisition unit;

[0022] A second resistor, one end of which is connected to the other end of the first resistor, and the other end of which is connected to one end of the fifth connector;

[0023] The fourteenth diode, one end of which is connected to the other end of the first resistor, and the other end of which is connected to the other end of the second resistor;

[0024] Multiple sets of peripheral circuits, the first end of which is connected to the positive pin of the acquisition unit;

[0025] The thirteenth diode, one end of which is connected to the other end of the first resistor, and the other end of which is connected to the second end of the peripheral circuit;

[0026] Multiple AFE built-in acquisition and self-diagnostic circuits are provided. The first terminal of the AFE built-in acquisition and self-diagnostic circuit is connected to the other terminal of the first resistor. The second terminal of the AFE built-in acquisition and self-diagnostic circuit is connected to the corresponding peripheral circuit. The third terminal of the AFE built-in acquisition and self-diagnostic circuit is connected to the negative pin of the acquisition unit.

[0027] Optionally, each group of peripheral circuits includes:

[0028] A first capacitor, one end of which is connected to the positive pin of the acquisition unit, and the other end of which is connected to the negative pin;

[0029] The third resistor has one end connected to the positive pin of the acquisition unit and the other end connected to the corresponding AFE built-in acquisition self-diagnostic circuit.

[0030] The fourth resistor has one end connected to the positive pin of the acquisition unit and the other end connected to the corresponding built-in acquisition self-diagnostic circuit of the AFE.

[0031] The second capacitor has one end connected to the other end of the fourth resistor, and the other end connected to the negative terminal pin.

[0032] Optionally, each group of AFEs includes a built-in self-diagnostic acquisition circuitry comprising:

[0033] The first diode has one end connected to the corresponding peripheral circuit, and the other end connected to the first diode of the adjacent AFE built-in self-diagnostic circuit.

[0034] A first switch, one end of which is connected to the corresponding peripheral circuit, and the other end of which is connected to the first switch of the adjacent AFE built-in acquisition self-diagnostic circuit;

[0035] A second switch, one end of which is connected to the corresponding peripheral circuit;

[0036] The fifth resistor has one end connected to the other end of the second switch, and the other end of the fifth resistor is connected to the second switch of the adjacent AFE built-in self-diagnostic circuit.

[0037] Optionally, the acquisition unit includes multiple sets of acquisition equalization RC networks and multiple sets of acquisition connectors. One end of each set of acquisition equalization RC networks is connected to the corresponding AFE unit, and the other end of each set of acquisition equalization RC networks is connected to the corresponding acquisition connector. Each set of acquisition connectors is connected to the corresponding battery pack.

[0038] Optionally, there are multiple AFE units, each corresponding one-to-one with a connected battery pack, and the power supply unit includes:

[0039] Power supply battery;

[0040] The main DC-DC converter has its first positive terminal connected to the positive terminal of the power supply battery, and its first negative terminal connected to the negative terminal of the power supply battery.

[0041] Multiple slave DC-DC converters are connected to the AFE unit, with the first positive terminal of the slave DC-DC converter connected to the second positive terminal of the master DC-DC converter, and the first negative terminal of the slave DC-DC converter connected to the second negative terminal of the master DC-DC converter.

[0042] The above technical solution involves first sequentially connecting the fifth connector of the control unit and the power supply unit, then sequentially connecting the first, second, third, and fourth transformers in the communication unit to the control unit. The control unit automatically broadcasts a self-diagnostic command. Upon receiving the command, all AFE units close all self-diagnostic switches (i.e., the second switch). After receiving feedback, the control unit displays the execution result on the screen. At this point, the acquisition connector is sequentially connected to the battery pack, and all power supply connectors (i.e., the fifth connector and the first, second, third, and fourth transformers) are disconnected. The AFE units are then charged to the same voltage as the external individual battery cells, eliminating the voltage difference during connection and thus eliminating the risk of AFE unit damage during hot-swapping. This circuit significantly reduces the probability of AFE damage during hot-swapping, improves product safety and reliability, enhances customer satisfaction, and is low-cost and easy to scale up.

[0043] Other features and advantages of this utility model embodiment will be described in detail in the following detailed description section. Attached Figure Description

[0044] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0045] Figure 1 This is a system framework diagram of a circuit system for preventing AFE hot-plug failure according to one embodiment of the present invention;

[0046] Figure 2 This is a circuit diagram of a circuit system for preventing AFE hot-plug failure according to one embodiment of the present invention;

[0047] Figure 3This is an internal circuit diagram of an AFE unit in a circuit system for preventing AFE hot-plugging failure according to one embodiment of the present invention.

[0048] Figure 4 This is a partial view of the internal circuit diagram of an AFE unit in a circuit system for preventing AFE hot-plug failure according to one embodiment of the present invention.

[0049] Explanation of reference numerals in the attached figures

[0050] Detailed Implementation

[0051] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0052] In the embodiments of this application, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used to describe the relative positional relationships of components in relation to the directions shown in the accompanying drawings or in relation to the vertical, perpendicular, or gravitational directions.

[0053] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0054] like Figure 1 As shown, Figure 1 This is a system framework diagram of a circuit system for preventing AFE hot-plug failure according to one embodiment of the present invention. Figure 1The circuit system includes: a data acquisition unit 1, an AFE unit 2, a communication unit 3, a power supply unit 4, and a control unit 5. The data acquisition unit 1 connects to the battery pack to acquire the individual cell voltages. The AFE unit 2 connects to the data acquisition unit 1 and processes the individual cell voltages. The first terminal of the communication unit 3 connects to the other terminal of the AFE unit 2. The power supply unit 4 connects to the second terminal of the communication unit 3 to pre-supply the AFE unit, providing voltage protection. The control unit 5 connects to the third terminal of the communication unit 3. In one embodiment, the power supply unit 4 supplies power to the AFE unit 2, and the control unit 5 sends control commands to the AFE unit 2. The AFE unit 2 is then charged, specifically the MLCC in its interface circuit. After charging is complete, the control unit 5 displays that the AFE unit 2 is connected to the data acquisition unit 1. At this point, the AFE unit 2 is charged to the same voltage as the external individual battery cell, eliminating the voltage difference during connection and thus eliminating the risk of damage to the AFE unit 2 during hot-swapping. This circuit significantly reduces the probability of AFE damage during hot-swapping, improves product safety and reliability, enhances customer satisfaction, and is low-cost and easy to scale up.

[0055] In this embodiment, such as Figure 2 As shown, there are multiple AFE units 2, each corresponding to a battery pack. The communication interfaces of adjacent AFE units 2 are connected to each other via capacitors. The communication interfaces of the first and last AFE units are connected to the communication unit 3.

[0056] In this embodiment, the circuit structure of the communication unit 3 can be one of many known to those skilled in the art. In one embodiment of this utility model, such as... Figure 2As shown, the communication unit 3 includes a first transformer T1A, a second transformer T2A, a first bridging chip, a second bridging chip, a third transformer T1B, a fourth transformer T2B, and a first connector BV1. One end of the first transformer T1A is connected to the other end of the first group of AFE units 2, and the other end of the first transformer T1A is connected to one end of the first connector BV1. One end of the second transformer T2A is connected to the other end of the last group of AFE units 2, and the other end of the second transformer T2A is connected to the second connector BV1. One end of the first bridging chip is connected to the control unit 5. The second bridging chip... One end of the chip is connected to the control unit 5; one end of the third transformer T1B is connected to the other end of the first bridging chip, and the other end of the third transformer T1B is connected to the third connector 1B; one end of the fourth transformer T2B is connected to the other end of the second bridging chip, and the other end of the fourth transformer T2B is connected to one end of the fourth connector 2B; the fifth connector BV includes multiple connectors for corresponding connection of AFE unit 2 and power supply unit 4; the other end of the first connector 1A is connected to the other end of the third connector 1B, and the other end of the second connector 2A is connected to the other end of the fourth connector 2B.

[0057] In this embodiment, the circuit structure for each group of AFE units 2 can be one of various structures known to those skilled in the art. In one embodiment of this invention, such as... Figure 3 As shown, each AFE unit 2 includes: a first resistor R1, a second resistor R2, a fourteenth diode D14, a thirteenth set of peripheral circuits 6, a thirteenth diode D13, and twelve sets of AFE built-in acquisition and self-diagnostic circuits 7. One end of the first resistor R1 is connected to the positive pin of the acquisition unit 1; one end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is connected to the fifth connector BV; one end of the fourteenth diode D14 is connected to the other end of the first resistor R1, and the other end of the fourteenth diode D14 is connected to the second resistor R2; the first end of the peripheral circuit 6 is connected to the positive pin of the acquisition unit 1; one end of the thirteenth diode D13 is connected to the other end of the first resistor, and the other end of the thirteenth diode D13 is connected to the second end of the twelfth set of peripheral circuits; the first end of the AFE built-in acquisition and self-diagnostic circuit 7 is connected to the other end of the first resistor R1, the second end of each AFE built-in acquisition and self-diagnostic circuit 7 is connected to each corresponding set of peripheral circuits 6, and the third end of the AFE built-in acquisition and self-diagnostic circuit 7 is connected to the negative pin of the acquisition unit 1.

[0058] In this embodiment, the circuit structure of the peripheral circuit 6 can be any of the various structures known to those skilled in the art. In one embodiment of this utility model, such as... Figure 3 and Figure 4It can be seen that there are thirteen groups of peripheral circuits 6, each group of peripheral circuits has the same circuit structure, and each group of peripheral circuits 6 is interconnected with the corresponding AFE built-in acquisition and self-diagnosis circuit 7. Each group of peripheral circuits 6 includes a first capacitor Cn, a third resistor RB, a fourth resistor RC, and a second capacitor Cx. One end of the first capacitor Cn is connected to the positive pin of the acquisition unit 1, and the other end of the first capacitor Cn is connected to the negative pin; one end of the third resistor RB is connected to the positive pin of the acquisition unit 1, and the other end of the third resistor RB is connected to the corresponding AFE built-in acquisition and self-diagnosis circuit 7; one end of the fourth resistor RC is connected to the positive pin of the acquisition unit 1, and the other end of the fourth resistor RC is connected to the corresponding AFE built-in acquisition and self-diagnosis circuit 7; one end of the second capacitor Cx is connected to the other end of the fourth resistor RC, and the other end of the second capacitor Cx1 is connected to the negative pin. The first capacitor Cn is the EMC capacitor of the AFE circuit interface in AFE unit 2, that is, Cn1- to Cn12+ are the EMC capacitors of the AFE circuit interface in AFE unit 2; the third resistor RB is the equalization resistor of the AFE circuit in AFE unit 2, that is, RB1- to RB12+ are the equalization resistors of the AFE circuit; the fourth resistor RC is the RC circuit resistor for acquisition, that is, RC1- to RC12+ are the RC circuit resistors for acquisition; the second capacitor Cx is the RC circuit capacitor for acquisition, that is, Cx1- to Cx12+ are the RC circuit capacitors for acquisition.

[0059] In this embodiment, the circuit structure of the built-in self-diagnostic acquisition circuit of the AFE can be various structures known to those skilled in the art. In one embodiment of this utility model, the built-in self-diagnostic acquisition circuit 7 of the AFE consists of twelve groups, such as... Figure 3 and Figure 4It can be seen that the circuit structure of each group of AFE built-in self-diagnostic acquisition circuits 7 is the same and each group of AFE built-in self-diagnostic acquisition circuits 7 is interconnected. Each group of AFE built-in self-diagnostic acquisition circuits includes a first diode D, a first switch SB, a second switch SD, and a fifth resistor RD. One end of the first diode D is connected to the corresponding group of peripheral circuits 6, and the other end of the first diode D is connected to the first diode D of the adjacent group of AFE built-in self-diagnostic acquisition circuits 7. One end of the first switch SB is connected to the corresponding group of peripheral circuits 6, and the other end of the first switch SB is connected to the first switch SB of the adjacent group of AFE built-in self-diagnostic acquisition circuits 7. One end of the second switch SD is connected to the corresponding group of peripheral circuits 6. One end of the fifth resistor RD is connected to the other end of the second switch SD, and the other end of the fifth resistor RD is connected to the second switch SD of the adjacent group of AFE built-in self-diagnostic acquisition circuits 7. The first diode D is the parasitic diode of AFE unit 2, that is, D1 to D12 are the parasitic diodes of AFE unit 2; the first switch SB is the internal equalization switch of AFE unit 2, that is, SB1 to SB12 are the equalization switches inside AFE unit 2; the second switch SD is the internal self-diagnostic switch of AFE unit 2, that is, SD1 to SD12 are the internal self-diagnostic switches of AFE unit 2; the fifth resistor RD is the internal self-diagnostic circuit resistor of AFE unit 2, that is, RD1 to RD12 are the internal self-diagnostic circuit resistors of AFE unit 2.

[0060] In this embodiment, the structure of the acquisition unit 1 can be any structure known to those skilled in the art. In one embodiment of this utility model, the acquisition unit 1 includes multiple sets of acquisition equalization RC networks 8 and multiple sets of acquisition connectors 9. One end of each set of acquisition equalization RC networks 8 is connected to the corresponding AFE unit 2, and the other end of each set of acquisition equalization RC networks 8 is connected to the corresponding acquisition connector 9. Each set of acquisition connectors 9 is connected to the corresponding battery pack MK. The battery pack MK is a battery module in the PACK, and the battery pack MK includes multiple battery packs, such as BM1 to BMn.

[0061] In this embodiment, the structure of the power supply unit 4 can be any of the structures known to those skilled in the art. In one embodiment of this utility model, the power supply unit 4 includes a power supply battery BAT, a main DC-DC converter, and multiple sets of slave DC-DC converters. The first positive terminal of the main DC-DC converter is connected to the positive terminal of the power supply battery BAT, and the first negative terminal of the main DC-DC converter is connected to the negative terminal of the power supply battery. Each set of slave DC-DC converters is connected to the AFE unit 2, and the first positive terminal of the slave DC-DC converter is connected to the second positive terminal of the main DC-DC converter, and the first negative terminal of the slave DC-DC converter is connected to the second negative terminal of the main DC-DC converter.

[0062] Specifically, the voltage from each DC-DC converter is 42.9V. When the fifth connector BV is inserted and the fifth resistor RD is fully closed, the voltage across the second resistor R2 and the thirteenth diode D13 is 3.4V. Thus, the voltage across all ports of AFE unit 2 is the difference between the voltage from each DC-DC converter and the voltage across the second resistor R2 and the thirteenth diode D13, divided by twelve, resulting in a voltage of 3.3V across all ports of AFE unit 2. This is the same as the voltage of a single cell in the external battery pack. At this time, there is no voltage difference between the inside and outside when the acquisition connector 9 is inserted, that is, no large current path is formed, thus protecting the AFE from damage.

[0063] The above technical solution involves first sequentially connecting the fifth connector BV of the control unit 5 and the power supply unit 4, then sequentially connecting the control unit 5 and the first transformer T1A, second transformer T2A, third transformer T1B, and fourth transformer T2B in the communication unit 3. The control unit 5 automatically broadcasts a self-diagnostic command. Upon receiving the command, all AFE units 2 close all self-diagnostic switches (i.e., the second switch SD). After receiving feedback, the control unit 5 displays the execution result on the display X1. At this point, the acquisition connector 9 is sequentially connected to the battery pack, and all power supply connectors (i.e., the fifth connector BV and the first transformer T1A, second transformer T2A, third transformer T1B, and fourth transformer T2B) are disconnected. The AFE unit 2 is then charged to the same voltage as the external individual battery, eliminating the voltage difference during connection and thus eliminating the risk of damage to the AFE unit 2 during hot-swapping. This circuit significantly reduces the probability of AFE damage during hot-swapping, improves product safety and reliability, enhances customer satisfaction, and is low-cost and easy to scale up.

[0064] The optional embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present utility model are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present utility model, various simple modifications can be made to the technical solutions of the embodiments of the present utility model, and these simple modifications all fall within the protection scope of the embodiments of the present utility model.

[0065] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the various possible combinations will not be described separately in this embodiment.

[0066] Furthermore, various different embodiments of this utility model can be combined arbitrarily, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A circuit system for preventing AFE hot-plug failure, characterized in that, The circuit system includes: The acquisition unit is used to connect to the battery pack to acquire the voltage of each individual cell in the battery pack. An AFE unit, one end of which is connected to the acquisition unit, is used to preprocess the individual cell voltage; A communication unit, wherein a first end of the communication unit is connected to the other end of the AFE unit; A power supply unit, connected to the second end of the communication unit, is used to pre-supply the AFE unit to provide voltage protection; A control unit, which is connected to the third end of the communication unit.

2. The circuit system according to claim 1, characterized in that, The AFE unit consists of multiple groups, each corresponding to a connected battery pack. The communication interfaces of adjacent AFE units are interconnected via capacitors. The communication interfaces of the first and last AFE units are connected to the communication unit.

3. The circuit system according to claim 1, characterized in that, The communication unit includes: A first transformer, one end of which is connected to the other end of the first group of AFE units, and the other end of which is connected to one end of a first connector; The second transformer, one end of which is connected to the other end of the last group of AFE units, and the other end of which is connected to one end of the second connector; A first bridging chip, one end of which is connected to the control unit; A second bridging chip, one end of which is connected to the control unit; The third transformer, one end of which is connected to the other end of the first bridging chip, and the other end of which is connected to one end of the third connector; The fourth transformer, one end of which is connected to the other end of the second bridging chip, and the other end of which is connected to one end of the fourth connector; The fifth connector includes multiple connectors for correspondingly connecting the AFE unit and the power supply unit; The other end of the first connector is connected to the other end of the third connector, and the other end of the second connector is connected to the other end of the fourth connector.

4. The circuit system according to claim 3, characterized in that, Each group of AFE units includes: A first resistor, one end of which is connected to the positive pin of the acquisition unit; A second resistor, one end of which is connected to the other end of the first resistor, and the other end of which is connected to one end of the fifth connector; The fourteenth diode, one end of which is connected to the other end of the first resistor, and the other end of which is connected to the other end of the second resistor; Multiple sets of peripheral circuits, the first end of which is connected to the positive pin of the acquisition unit; The thirteenth diode, one end of which is connected to the other end of the first resistor, and the other end of which is connected to the second end of the peripheral circuit; Multiple AFE built-in acquisition and self-diagnostic circuits are provided. The first terminal of the AFE built-in acquisition and self-diagnostic circuit is connected to the other terminal of the first resistor. The second terminal of the AFE built-in acquisition and self-diagnostic circuit is connected to the corresponding peripheral circuit. The third terminal of the AFE built-in acquisition and self-diagnostic circuit is connected to the negative pin of the acquisition unit.

5. The circuit system according to claim 4, characterized in that, Each group of peripheral circuits includes: A first capacitor, one end of which is connected to the positive pin of the acquisition unit, and the other end of which is connected to the negative pin; The third resistor has one end connected to the positive pin of the acquisition unit and the other end connected to the corresponding AFE built-in acquisition self-diagnostic circuit. The fourth resistor has one end connected to the positive pin of the acquisition unit and the other end connected to the corresponding built-in acquisition self-diagnostic circuit of the AFE. The second capacitor has one end connected to the other end of the fourth resistor, and the other end connected to the negative terminal pin.

6. The circuit system according to claim 4, characterized in that, Each AFE's built-in self-diagnostic acquisition circuit includes: The first diode has one end connected to the corresponding peripheral circuit, and the other end connected to the first diode of the adjacent AFE built-in self-diagnostic circuit. A first switch, one end of which is connected to the corresponding peripheral circuit, and the other end of which is connected to the first switch of the adjacent AFE built-in acquisition self-diagnostic circuit; A second switch, one end of which is connected to the corresponding peripheral circuit; The fifth resistor has one end connected to the other end of the second switch, and the other end of the fifth resistor is connected to the second switch of the adjacent AFE built-in self-diagnostic circuit.

7. The circuit system according to claim 1, characterized in that, The acquisition unit includes multiple sets of acquisition equalization RC networks and multiple sets of acquisition connectors. One end of each set of acquisition equalization RC networks is connected to the corresponding AFE unit, and the other end of each set of acquisition equalization RC networks is connected to the corresponding acquisition connector. Each set of acquisition connectors is connected to the corresponding battery pack.

8. The circuit system according to claim 1, characterized in that, The AFE unit comprises multiple groups, each corresponding to a connected battery pack. The power supply unit includes: Power supply battery; The main DC-DC converter has its first positive terminal connected to the positive terminal of the power supply battery, and its first negative terminal connected to the negative terminal of the power supply battery. Multiple slave DC-DC converters are connected to the AFE unit, with the first positive terminal of the slave DC-DC converter connected to the second positive terminal of the master DC-DC converter, and the first negative terminal of the slave DC-DC converter connected to the second negative terminal of the master DC-DC converter.

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