BMS high-voltage fast-charging cathode relay adhesion diagnosis circuit

Abstract

The utility model discloses a BMS (Battery Management System) high-voltage fast-charging cathode relay adhesion diagnosis circuit, which comprises a battery pack module, a battery pack fast-charging module, a battery pack pre-charging module, a battery pack fast-charging cathode control module, a battery pack cathode relay and a fast-charging relay monitoring module, the battery pack fast charging module comprises battery pack output ports and a battery pack fast charging input port, and the two ends of the battery pack module are connected with the battery pack output ports in series respectively; the battery pack pre-charging module is connected in parallel between the battery pack module and the battery pack output port; the battery pack pre-charging module comprises a relay S1, a relay S2 and a resistor R1; therefore, the state of the fast-charging cathode relay is directly detected in real time without relying on other detection circuit resources, the adhesion diagnosis logic strategy of the fast-charging cathode relay is optimized, the detection precision of the fast-charging cathode relay is improved, and the detection reliability is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of negative relay diagnosis, and in particular to a diagnostic circuit for adhesion of BMS high voltage fast charging negative relay. Background Technology

[0002] When the fast charging negative relay is closed, the connected negative reference ground results in a voltage of 0 potential for a typical ADC acquisition circuit. This is because the reference ground of the ADC acquisition port is also a high-voltage negative terminal, making it impossible to directly identify the voltage.

[0003] Traditional BMS fast charging negative relay detection circuits cannot directly identify the closed state of the fast charging negative relay.

[0004] Traditional BMS fast charging negative terminal electrical detection circuits, even if capable of detecting the fast charging negative terminal status, require additional conditions for auxiliary judgment, such as the fast charging positive relay being closed and the battery pack being within the vehicle.

[0005] The traditional BMS fast charging negative relay detection circuit has relatively complex detection logic and is affected by the ADC acquisition accuracy. Summary of the Invention

[0006] This utility model aims to at least partially solve one of the technical problems in the related art.

[0007] Therefore, the purpose of this utility model is to propose a BMS high-voltage fast charging negative relay adhesion diagnosis circuit, which directly detects the status of the fast charging negative relay in real time, without relying on other detection circuit resources, optimizes the fast charging negative relay adhesion diagnosis logic strategy, improves the detection accuracy of the fast charging negative relay, and enhances the reliability of the detection.

[0008] To achieve the above objectives, this utility model proposes a BMS high-voltage fast charging negative electrode relay adhesion diagnostic circuit, including a battery pack module, a battery pack fast charging module, a battery pack pre-charge module, a battery pack fast charging negative electrode control module, a battery pack negative electrode relay, and a fast charging relay monitoring module. The battery pack module is connected in series with the battery pack fast charging module, which includes a battery pack output port and a battery pack fast charging input port. The two ends of the battery pack module are respectively connected in series with the battery pack output port. The battery pack pre-charge module is connected in parallel between the battery pack module and the battery pack output port, and includes a relay... The device comprises an electrical component S1, a relay S2, and a resistor R1. The relay S1 is connected in series between the battery pack module and the battery pack output port. The relay S2 and resistor R1 are connected in parallel between the battery pack module and the battery pack output port. The battery pack fast-charging negative terminal control module is connected in series between the battery pack module and the battery pack output port. The battery pack negative terminal relay is connected in series between the battery pack module and the battery pack output port. The fast-charging relay monitoring module is connected in series with the battery pack fast-charging input port, and the fast-charging relay monitoring module and the battery pack fast-charging negative terminal control module are also connected in series.

[0009] This invention relates to a BMS high-voltage fast-charging negative relay adhesion diagnostic circuit, which directly detects the status of the fast-charging negative relay in real time without relying on other detection circuit resources. It optimizes the fast-charging negative relay adhesion diagnostic logic strategy, improves the detection accuracy of the fast-charging negative relay, and enhances the reliability of the detection.

[0010] In addition, the BMS high-voltage fast charging negative relay adhesion diagnostic circuit proposed above may also have the following additional technical features:

[0011] Specifically, the battery pack fast charging negative control module includes a battery pack fast charging positive relay, a fast charging negative relay, and a fast charging negative sampling point. The two ends of the battery pack fast charging positive relay are connected in series to the battery pack fast charging input port, and the battery pack fast charging positive relay is also connected in series with resistor R1 and the battery pack output port in a series circuit. The fast charging negative relay is connected in parallel between the battery pack negative relay and the battery pack fast charging input port. The fast charging negative sampling point is connected to the fast charging negative relay, and the fast charging negative sampling point is located in a series circuit between the fast charging relay monitoring module and the battery pack fast charging negative control module.

[0012] Specifically, the fast charging relay monitoring module includes a controller monitoring port, a power supply control component, resistors R4 and R2, a grounding wire, and a reverse voltage protection component. The reverse voltage protection component is connected in series with the fast charging input port of the battery pack; the power supply control component is connected in series with the reverse voltage protection component; the controller monitoring port is connected in series with the power supply control component; resistors R2 and R4 are respectively disposed in the series circuit of the controller monitoring port and the power supply control component, and resistor R is connected in series with the grounding wire.

[0013] Specifically, the anti-reverse voltage withstand component includes diode D1 and diode D, wherein the two ends of diode D1 are connected in series with diode D2 and the power supply control component, respectively; one end of diode D2 is connected in series with the fast charging input port of the battery pack.

[0014] Specifically, the power supply control component includes an optocoupler disconnect switch, a low-voltage power supply, a high-voltage power supply, and a resistor R3. The optocoupler disconnect switch is connected in series with the diode D1. The low-voltage power supply and the high-voltage power supply are respectively connected in series with the optocoupler disconnect switch. The resistor R3 is disposed in the series circuit of the high-voltage power supply and the optocoupler disconnect switch.

[0015] Specifically, the battery pack fast charging input port includes a battery pack fast charging positive input port DC+ and a battery pack negative input port DC, wherein the battery pack positive input port DC+ is connected in series with the battery pack fast charging positive relay; and the battery pack negative input port DC- is connected in series with the fast charging negative sampling point.

[0016] Specifically, the low-voltage power supply is 5V, and the low-voltage power supply is electrically output to the controller monitoring port; the high-voltage power supply is 5V, and the high-voltage power supply is electrically output to the optocoupler isolation switch.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 This is a circuit diagram of a BMS high-voltage fast charging negative relay adhesion diagnostic circuit according to one embodiment of the present invention.

[0020] As shown in the figure: 10, Battery pack module; 20, Battery pack fast charging module; 201, Battery pack output port; 202, Battery pack fast charging input port; 30, Battery pack pre-charge module; 301, Relay S1; 302, Relay S2; 303, Resistor R1; 40, Battery pack fast charging negative terminal control module; 401, Battery pack negative terminal relay; 402, Fast charging negative terminal relay; 403, Fast charging negative terminal sampling point; 50, Battery pack negative terminal relay; 60, Fast charging relay monitoring module; 601, Controller monitoring port; 602, Power supply control component; 6021, Optocoupler isolation switch; 6022, Low-voltage power supply; 6023, High-voltage power supply; 6024, Resistor R3; 603, Resistor R4; 604, Resistor R2; 605, Grounding wire; 606, Anti-reverse withstand voltage component; 6061, Diode D1; 6062, Diode D2. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Rather, the embodiments of the present invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0022] The following description, in conjunction with the accompanying drawings, describes a BMS high-voltage fast-charging negative relay adhesion diagnostic circuit according to an embodiment of the present invention.

[0023] like Figure 1 As shown, a BMS high-voltage fast charging negative electrode relay adhesion diagnostic circuit according to an embodiment of the present invention includes a battery pack module 10, a battery pack fast charging module 20, a battery pack pre-charge module 30, a battery pack fast charging negative electrode control module 40, a battery pack negative electrode relay 50, and a fast charging relay monitoring module 60.

[0024] The battery pack module 10 is connected in series with the battery pack fast charging module 20, which includes a battery pack output port 201 and a battery pack fast charging input port 202.

[0025] The battery pack module 10 is connected in series with the battery pack output port 201 at both ends, and the battery pack precharge module 30 is connected in parallel between the battery pack module 10 and the battery pack output port 201.

[0026] It should be noted that the battery pack output port 201 includes a positive terminal and a negative terminal for the battery pack output voltage. The battery pack fast charging input port 202 includes a positive terminal and a negative terminal for the battery pack fast charging.

[0027] The battery pack precharge module 30 includes relay S1301, relay S2302 and resistor R1303.

[0028] Among them, relay S1301 is set in the series circuit of battery pack module 10 and battery pack output port 201, and relay S2302 and resistor R1303 are respectively set in the parallel circuit of battery pack module 10 and battery pack output port 201.

[0029] It should be noted that relay S1301 is the battery pack positive relay, which controls the output of the high voltage positive circuit; relay S2302 is the battery pack precharge relay, which controls the output of the high voltage precharge circuit; and resistor R1 is the battery pack precharge resistor, which limits the current during precharge.

[0030] The battery pack fast charging negative control module 40 is set on the series circuit of the battery pack module 10 and the battery pack output port 201.

[0031] It should be noted that the battery pack fast charging negative terminal control module 40 is set in the circuit to accurately determine whether the fast charging negative terminal relay is in a closed state.

[0032] The battery pack negative relay 50 is installed in the series circuit between the battery pack module 10 and the battery pack output port 201.

[0033] It should be noted that the closed state of the battery pack negative relay 50 and the battery pack fast charging negative control module 40 is determined by whether current is generated at the optocoupler control terminal and whether the optocoupler is conducting, thereby determining whether the fast charging negative relay is in a closed state.

[0034] The fast charging relay monitoring module 60 is connected in series with the fast charging input port 202 of the battery pack, and the fast charging relay monitoring module 60 and the fast charging negative terminal control module 40 of the battery pack are connected in series.

[0035] Specifically, the steps of the BMS fast charging negative relay adhesion diagnosis circuit are as follows: When the battery pack negative relay 50 is closed, the battery pack fast charging negative control module 40 determines whether there is current at the optocoupler control terminal, and then determines whether the optocoupler is conducting. At this time, the fast charging relay monitoring module 60 collects the voltage, and determines whether the fast charging negative relay is open or closed based on the collected voltage.

[0036] In one embodiment of this utility model, such as Figure 1 As shown, the battery pack fast charging negative control module 40 includes a battery pack fast charging positive relay 401, a fast charging negative relay 402, and a fast charging negative sampling point 403.

[0037] The battery pack fast charging positive relay 401 is connected in series with the battery pack fast charging input port 202, and is also connected in series with resistor R1303 and the battery pack output port 201. The fast charging negative relay 402 is connected in parallel between the battery pack negative relay 50 and the battery pack fast charging input port 202. The fast charging negative sampling point 403 is connected in series with the fast charging negative relay 402, and is located in the series circuit between the fast charging relay monitoring module 60 and the battery pack fast charging negative control module 40.

[0038] It should be noted that the fast charging negative sampling point 403 is in a floating state when the fast charging negative relay 402 is not closed, and no current is generated at the optocoupler control terminal at this time. However, when the fast charging negative sampling point 403 is connected to the high voltage acquisition when the fast charging negative relay 402 is not closed, current is generated at the optocoupler control terminal, and the optocoupler is turned on.

[0039] In one embodiment of this utility model, such as Figure 1 As shown, the fast charging relay monitoring module 60 includes a controller monitoring port 601, a power supply control component 602, a resistor R4 603, a resistor R2 604, a grounding wire 605, and a reverse withstand voltage component 606.

[0040] The reverse voltage withstand component 606 is connected in series to the fast charging input port 202 of the battery pack, the power supply control component 602 is connected in series to the reverse voltage withstand component 606, and the controller monitoring port 601 is connected in series to the power supply control component 602. Resistors R2604 and R4603 are respectively set in the series circuit of the controller monitoring port 601 and the power supply control component 602, and resistor R4603 is connected in series to the ground wire 605.

[0041] It should be noted that the controller detection port 601 is the ADC detection port of the MCU in the high-voltage negative electrode detection circuit of the BMS controller, and the power supply control component 602 is the power supply for the optocoupler low-voltage MCU and the sampling power supply. Resistor R2604 is the current-limiting resistor for the ADC detection of the MCU in the high-voltage negative electrode detection circuit of the BMS controller, and resistor R4603 is the filter resistor for the ADC acquisition port of the high-voltage negative electrode detection circuit of the BMS controller to prevent false triggering.

[0042] In one embodiment of this utility model, such as Figure 1 As shown, the anti-reverse withstand voltage component 606 includes diode D16061 and diode D26062.

[0043] In this configuration, diode D16061 is connected in series with diode D26062 and power supply control component 602, respectively, and one end of diode D26062 is connected in series with battery pack fast charging input port 202.

[0044] It should be noted that diodes D16061 and D26062 are reverse protection diodes for the high-voltage negative detection port of the BMS controller, and the use of two of them improves the reverse protection withstand voltage.

[0045] In one embodiment of this utility model, such as Figure 1 As shown, the power supply control component 602 includes an optocoupler disconnect switch 6021, a low-voltage power supply 6022, a high-voltage power supply 6023, and a resistor R36024.

[0046] In this circuit, the optocoupler disconnect switch 6021 is connected in series with diode D16061, the low-voltage power supply 6022 and the high-voltage power supply 6023 are connected in series with the optocoupler disconnect switch 6021 respectively, and the resistor R36024 is set in the series circuit of the high-voltage power supply 6023 and the optocoupler disconnect switch 6021.

[0047] It should be noted that the optocoupler disconnect switch 6021 is the optocoupler disconnect switch in the high-voltage negative detection circuit of the BMS controller. The low-voltage power supply 6022 provides 5V low-voltage power to the low-voltage MCU and sampling circuit in the BMS controller's high-voltage negative detection circuit. The high-voltage power supply 6023 provides 5V high-voltage power to the optocoupler in the BMS controller's high-voltage negative detection circuit. Resistor R36024 is the load resistor for the optocoupler in the BMS controller's high-voltage negative detection circuit; the optocoupler requires a certain load current to trigger.

[0048] In one embodiment of this utility model, such as Figure 1 As shown, the battery pack fast charging input port 202 includes a battery pack fast charging positive input port DC+ and a battery pack negative input port DC.

[0049] Among them, the positive input port DC+ of the battery pack is connected in series with the fast charging positive relay 401 of the battery pack, and the negative input port DC- of the battery pack is connected in series with the fast charging negative sampling point 403.

[0050] It should be noted that, through the fast charging negative sampling point 403 and the fast charging negative relay 402, the fast charging relay monitoring module 60 determines the closed state of the fast charging negative relay 402 by collecting the voltage.

[0051] In one embodiment of this utility model, such as Figure 1 As shown, the low-voltage power supply 6022 is 5V, and the low-voltage power supply 6022 electrically outputs the controller monitoring port 601. The high-voltage power supply 6023 is 5V, and the high-voltage power supply 6023 electrically outputs the optocoupler isolation switch 6021.

[0052] It should be noted that the low-voltage power supply 6022 provides power to the low-voltage MCU and the sampling, while the high-voltage power supply 6023 provides power to the optocoupler.

[0053] This utility model discloses a diagnostic circuit for fast charging negative electrode relay adhesion in a BMS system. The monitoring process for the fast charging negative electrode is as follows:

[0054] When relay S350 is closed and fast charging negative relay 402 is not closed, negative sampling point 403 is floating, no current is generated at the optocoupler control terminal, and the optocoupler is not conducting. When the optocoupler is not conducting, the low-voltage measurement MCU's AD port at the controller monitoring port 601 acquires a low level, around 0V. At this time, the voltage acquired by the AD port is used to determine that fast charging negative relay 402 is in the open state.

[0055] When relay S350 is closed, and fast charging negative relay 402 is closed or stuck, the fast charging negative sampling point and the high-voltage acquisition ground are connected, generating current at the optocoupler control terminal, and the optocoupler is activated. When the optocoupler is activated, the voltage level acquired by the AD port of the low-voltage measurement MCU is high, around 5V. At this time, the voltage acquired by the AD port is used to determine whether the fast charging negative relay is in the closed state.

[0056] In summary, the BMS high-voltage fast charging negative relay adhesion diagnostic circuit of this utility model can directly detect the status of the fast charging negative relay in real time without relying on other detection circuit resources. It optimizes the fast charging negative relay adhesion diagnostic logic strategy, improves the detection accuracy of the fast charging negative relay, and enhances the reliability of the detection.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A diagnostic circuit for BMS high-voltage fast-charging negative relay adhesion, characterized in that, It includes a battery pack module (10), a battery pack fast charging module (20), a battery pack pre-charge module (30), a battery pack fast charging negative terminal control module (40), a battery pack negative terminal relay (50), and a fast charging relay monitoring module (60), among which, The battery pack module (10) is connected in series with the battery pack fast charging module (20). The battery pack fast charging module (20) includes a battery pack output port (201) and a battery pack fast charging input port (202). The two ends of the battery pack module (10) are respectively connected in series to the battery pack output port (201). The battery pack precharge module (30) is connected in parallel between the battery pack module (10) and the battery pack output port (201). The battery pack precharge module (30) includes relay S1 (301), relay S2 (302), and resistor R1 (303). The relay S1 (301) is disposed on the series circuit of the battery pack module (10) and the battery pack output port (201); The relay S2 (302) and resistor R1 (303) are respectively disposed on the parallel circuit of the battery pack module (10) and the battery pack output port (201); The battery pack fast charging negative terminal control module (40) is disposed on the series circuit of the battery pack module (10) and the battery pack output port (201); The battery pack negative relay (50) is disposed on the series circuit of the battery pack module (10) and the battery pack output port (201); The fast charging relay monitoring module (60) is connected in series to the fast charging input port (202) of the battery pack, and the fast charging relay monitoring module (60) and the fast charging negative terminal control module (40) of the battery pack are connected in series.

2. The BMS high-voltage fast charging negative relay adhesion diagnostic circuit according to claim 1, characterized in that, The battery pack fast charging negative electrode control module (40) includes a battery pack fast charging positive electrode relay (401), a fast charging negative electrode relay (402), and a fast charging negative electrode sampling point (403), wherein, The two ends of the battery pack fast charging positive relay (401) are connected in series to the battery pack fast charging input port (202), and the battery pack fast charging positive relay (401) is connected in series to the resistor R1 (303) and the battery pack output port (201) in a series circuit. The fast charging negative relay (402) is connected in parallel between the battery pack negative relay (50) and the battery pack fast charging input port (202); The fast charging negative electrode sampling point (403) is connected to the fast charging negative electrode relay (402), and the fast charging negative electrode sampling point (403) is set on the series circuit of the fast charging relay monitoring module (60) and the battery pack fast charging negative electrode control module (40).

3. The BMS high-voltage fast charging negative relay adhesion diagnostic circuit according to claim 1, characterized in that, The fast charging relay monitoring module (60) includes a controller monitoring port (601), a power supply control component (602), a resistor R4 (603), a resistor R2 (604), a grounding wire (605), and a reverse withstand voltage component (606), wherein, The anti-reverse voltage withstand component (606) is connected in series to the fast charging input port (202) of the battery pack. The power supply control component (602) is connected in series with the anti-reverse voltage withstand component (606). The controller monitoring port (601) is connected in series with the power supply control component (602). The resistors R2 (604) and R4 (603) are respectively set on the series circuit of the controller monitoring port (601) and the power supply control component (602), and the resistor R4 (603) is connected in series to the ground wire (605).

4. The BMS high-voltage fast charging negative relay adhesion diagnostic circuit according to claim 3, characterized in that, The anti-reverse withstand voltage assembly (606) includes diode D1 (6061) and diode D2 (6062), wherein, The two ends of the diode D1 (6061) are connected in series with the diode D2 (6062) and the power supply control component (602). One end of the diode D2 (6062) is connected in series to the fast charging input port (202) of the battery pack.

5. A diagnostic circuit for BMS high-voltage fast-charging negative relay adhesion according to claim 4, characterized in that, The power supply control component (602) includes an optocoupler disconnect switch (6021), a low-voltage power supply (6022), a high-voltage power supply (6023), and a resistor R3 (6024), wherein, The optocoupler disconnect switch (6021) is connected in series with the diode D1 (6061). The low-voltage power supply (6022) and the high-voltage power supply (6023) are respectively connected in series with the optocoupler disconnect switch (6021); The resistor R3 (6024) is connected in series with the high voltage power supply (6023) and the optocoupler isolation switch (6021).

6. The BMS high-voltage fast charging negative relay adhesion diagnostic circuit according to claim 2, characterized in that, The battery pack fast charging input port (202) includes a battery pack fast charging positive input port DC+ and a battery pack negative input port DC, wherein, The positive input port DC+ of the battery pack is connected in series with the fast charging positive relay (401) of the battery pack. The negative input port DC of the battery pack is connected in series with the fast charging negative sampling point (403).

7. A diagnostic circuit for BMS high-voltage fast-charging negative relay adhesion according to claim 5, characterized in that, The low-voltage power supply (6022) is 5V and is electrically output to the controller monitoring port (601). The high-voltage power supply (6023) is 5V and is electrically output to the optocoupler disconnect switch (6021).

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