CN219201857U - Main contactor diagnostic circuit and battery pack - Google Patents
Main contactor diagnostic circuit and battery pack Download PDFInfo
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- CN219201857U CN219201857U CN202223552324.5U CN202223552324U CN219201857U CN 219201857 U CN219201857 U CN 219201857U CN 202223552324 U CN202223552324 U CN 202223552324U CN 219201857 U CN219201857 U CN 219201857U
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Abstract
The utility model provides a main contactor diagnosis circuit and a battery pack, wherein the main contactor diagnosis circuit comprises a first voltage division circuit connected between an input end of a main positive contactor and an output end of a main negative contactor, a second voltage division circuit connected with the input end of the main positive contactor, a third voltage division circuit connected with the output end of the main positive contactor, and a first comparator and a second comparator. The main contactor diagnosis circuit can replace the existing voltage measurement method by the comparator method through arranging the comparator, can cancel the A/D conversion and SPI isolation communication, simplify the high-voltage measurement link, reduce the communication data quantity, simultaneously can avoid the interference of detection result signals, can avoid the error of the voltage test result, can ensure the accuracy of the diagnosis result, and has good practicability.
Description
Technical Field
The utility model relates to the technical field of detection of a main contactor of a battery pack, in particular to a diagnosis circuit of a main contactor. The utility model also relates to a battery pack provided with the main contactor diagnosis circuit.
Background
Currently, it is common in a BMS (Battery Management System ) to diagnose whether a main contactor (including a main positive contactor, a main negative contactor) in a battery pack is closed and whether a precharge circuit is completed by high voltage collection. However, the existing voltage measurement method also has many limitations, such as longer signal path, more links, worse real-time performance, more voltage test points, and large communication data volume, which is unfavorable for the initialization of the battery pack management system. In addition, the analog signal used for representing the result in the existing voltage measurement method is also easy to be interfered, so that the voltage test result is error, and the accuracy of the diagnosis result is affected.
Disclosure of Invention
In view of the foregoing, the present utility model is directed to a main contactor diagnostic circuit that overcomes at least some of the shortcomings of the prior voltage measurement methods and has better practicability.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
a diagnostic circuit of a main contactor comprises a first voltage dividing circuit connected between an input end of a main positive contactor and an output end of a main negative contactor, a second voltage dividing circuit connected with the input end of the main positive contactor, a third voltage dividing circuit connected with the output end of the main positive contactor, a first comparator and a second comparator;
the first voltage dividing circuit comprises a first resistor and a second resistor which are connected in series, the second voltage dividing circuit comprises a third resistor and a fourth resistor which are connected in series, and the third voltage dividing circuit comprises a fifth resistor and a sixth resistor which are connected in series;
the inverting input end of the first comparator is connected between the first resistor and the second resistor, the non-inverting input end of the first comparator is connected with a 5V power supply, the non-inverting input end of the second comparator is connected between the third resistor and the fourth resistor and is connected with the 5V power supply through a first diode, and the inverting input end of the second comparator is connected between the fifth resistor and the sixth resistor.
Further, the 5V power supply is connected to the non-inverting input terminal of the first comparator and the first diode through a seventh resistor, and an eighth resistor is connected between the input terminal of the first diode and the ground terminal.
Further, the output end of the first comparator is connected with a first photoelectric coupler, the output end of the second comparator is connected with a second photoelectric coupler, the output end of the first photoelectric coupler outputs the comparison result of the first comparator, and the output end of the second photoelectric coupler outputs the comparison result of the second comparator.
Furthermore, the two ends of the main positive contactor are connected in parallel with a pre-charging circuit, and the pre-charging circuit comprises a pre-charging resistor and a pre-charging contactor which are connected in series;
and a pre-charge capacitor is connected between the output end and the grounding end of the pre-charge contactor, and the resistance values of the fifth resistor and the sixth resistor are adjustable.
Further, the output end of the main positive contactor is connected with a first fuse and a second fuse which are arranged in parallel, the output end of the second fuse is connected with a fourth voltage dividing circuit, the output end of the first fuse is connected with a fifth voltage dividing circuit, and the main contactor diagnosis circuit further comprises a third comparator, a fourth comparator, a fifth comparator and a sixth comparator;
the third comparator and the fourth comparator are respectively connected with the third voltage dividing circuit and the fourth voltage dividing circuit, the output ends of the third comparator and the fourth comparator are connected in parallel, the fifth comparator and the sixth comparator are respectively connected with the third voltage dividing circuit and the fifth voltage dividing circuit, and the output ends of the fifth comparator and the sixth comparator are connected in parallel.
Further, the fourth voltage dividing circuit comprises a twenty-seventh resistor and a twenty-eighth resistor which are connected in series, and the fifth voltage dividing circuit comprises a thirty-first resistor and a thirty-second resistor which are connected in series;
the non-inverting input end of the third comparator is connected with an eleventh resistor, the eleventh resistor and the inverting input end of the fourth comparator are connected in parallel between the fifth resistor and the sixth resistor, the non-inverting input end of the fourth comparator is connected with a fourteenth resistor, and the fourteenth resistor and the inverting input end of the third comparator are connected in parallel between the twenty-seventh resistor and the twenty-eighth resistor;
the non-inverting input end of the fifth comparator is connected with a sixteenth resistor, the sixteenth resistor and the inverting input end of the sixth comparator are connected in parallel with a thirteenth resistor, the thirteenth resistor is connected between the fifth resistor and the sixth resistor, the non-inverting input end of the sixth comparator is connected with an eighteenth resistor, and the eighteenth resistor and the inverting input end of the fifth comparator are connected in parallel between the thirty-first resistor and the thirty-second resistor.
Further, the output end of the third comparator is connected with a second diode, the output end of the fourth comparator is connected with a third diode, the output ends of the second diode and the third diode are connected in parallel and then connected with a third photoelectric coupler, and the output end of the third photoelectric coupler outputs comparison results of the third comparator and the fourth comparator;
the output end of the fifth comparator is connected with a fourth diode, the output end of the sixth comparator is connected with a fifth diode, the fourth diode and the output end of the fifth diode are connected in parallel and then connected with a fourth photoelectric coupler, and the output end of the fourth photoelectric coupler outputs comparison results of the fifth comparator and the sixth comparator.
Further, a twelfth resistor is connected between the non-inverting input end and the grounding end of the third comparator, a fifteenth resistor is connected between the non-inverting input end and the grounding end of the fourth comparator, and a seventeenth resistor is connected between the non-inverting input end and the grounding end of the fifth comparator;
the main contactor diagnosis circuit further comprises a sixth voltage division circuit connected with a 5V power supply, the sixth voltage division circuit comprises a twenty-ninth resistor and a thirty-ninth resistor which are connected in series, a sixth diode is connected between the sixth voltage division circuit and the fourth voltage division circuit, and a seventh diode is connected between the sixth voltage division circuit and the fifth voltage division circuit.
Further, the main contactor diagnostic circuit further comprises a sleep power-on circuit, wherein the sleep power-on circuit comprises a thirty third resistor and a fifth photoelectric coupler, wherein the thirty third resistor and the fifth photoelectric coupler are connected in series between a 5V power supply and a ground terminal, and an output terminal of the fifth photoelectric coupler is connected in series between an input terminal of the main positive contactor and the first resistor.
Compared with the prior art, the utility model has the following advantages:
the main contactor diagnosis circuit can replace the existing voltage measurement method by the comparator method through arranging the comparator, can cancel the A/D conversion and SPI isolation communication, simplify the high-voltage measurement link, reduce the communication data quantity, simultaneously can avoid the interference of detection result signals, can avoid the error of the voltage test result, can ensure the accuracy of the diagnosis result, and has good practicability.
In addition, through the arrangement of the pre-charging capacitor, the resistance values of the fifth resistor and the sixth resistor are adjustable, and the detection of the pre-charging state of the battery pack can be realized on the basis of the adhesion diagnosis of the contacts of the main contactor in cooperation with the arrangement of the comparator. The third comparator, the fourth comparator, the fifth comparator, the sixth comparator and the related voltage dividing circuit can realize the diagnosis of the on-off states of the two fuses, and are beneficial to increasing the efficacy of the circuit. The dormant power-on circuit can reduce the energy consumption of the circuit when the whole car and the battery pack are dormant, and is beneficial to further improving the practicability of the whole circuit.
Another object of the present utility model is to propose a battery pack in which a main contactor diagnostic circuit as described above is provided in a battery management system.
Compared with the prior art, the battery pack has the same beneficial effects as the main contactor diagnosis circuit, and the description is omitted.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
fig. 1 is a schematic circuit diagram of a main contactor diagnostic circuit according to an embodiment of the present utility model.
Reference numerals:
k0, pre-charging the contactor; k1, a main negative contactor; k2, a main positive contactor; RS1, first fuse; RS2, second fuse; c0, pre-charging the capacitor;
R1-R33, a first resistor and a thirty-third resistor; d1-D7, first diode-seventh diode; U1-U5, first photoelectric coupler-fifth photoelectric coupler.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
In the description of the present utility model, it should be noted that, if terms indicating an orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. are presented, they are based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, in the description of the present utility model, unless otherwise specifically defined, the mating components may be connected using conventional connection structures in the art. Moreover, the terms "mounted," "connected," and "connected" are to be construed broadly. For example, the connection can be fixed connection, detachable connection or integrated connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in combination with specific cases.
The utility model will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
The embodiment relates to a main contactor diagnosis circuit which is used in a high-voltage loop of a battery pack and can be particularly used for detecting and diagnosing contact adhesion of a main contactor in the main loop of the battery pack.
In combination with the overall design shown in fig. 1, the main contactor diagnostic circuit of the present embodiment includes a first voltage dividing circuit connected between the input terminal of the main positive contactor K2 and the output terminal of the main negative contactor K1, a second voltage dividing circuit connected to the input terminal of the main positive contactor K2, and a third voltage dividing circuit connected to the output terminal of the main positive contactor K2, and at the same time, the main contactor diagnostic circuit of the present embodiment further includes a first comparator A1 and a second comparator A2.
The first voltage dividing circuit specifically includes a first resistor R1 and a second resistor R2 that are arranged in series, the second voltage dividing circuit specifically includes a third resistor R3 and a fourth resistor R4 that are arranged in series, and the third voltage dividing circuit includes a fifth resistor R5 and a sixth resistor R6 that are arranged in series. The second resistor R2 is connected with the output end of the main negative contactor K1 and is also connected with the ground end, and the fourth resistor R4 and the fifth resistor R5 are connected with the ground end.
The inverting input terminal of the first comparator A1 of the present embodiment is connected to the first voltage dividing circuit between the first resistor R1 and the second resistor R2, and the non-inverting input terminal of the first comparator A1 is connected to the 5V power supply. The non-inverting input terminal of the second comparator A2 is connected to the second voltage dividing circuit between the third resistor R3 and the fourth resistor R4, and is also connected to the 5V power supply through the first diode D1, and the inverting input terminal of the second comparator A2 is connected to the third voltage dividing circuit between the fifth resistor R5 and the sixth resistor R6.
As also shown in fig. 1, in the embodiment, a 5V power supply is also connected to the non-inverting input terminal of the first comparator A1 and the first diode D1 through the seventh resistor R7, and an eighth resistor R8 is connected between the input terminal of the first diode D1 and the ground terminal. In addition, as a preferred embodiment, the output of the first comparator A1 is connected to the first photocoupler U1, and the output of the second comparator A2 is connected to the second photocoupler U2. At this time, the output end of the first photo-coupler U1 outputs the comparison result of the first comparator A1, and the output end of the second photo-coupler U2 outputs the comparison result of the second comparator A2.
In a specific circuit, the output end of the first comparator A1 is connected to the first photo-coupler U1 through a ninth resistor R9, and meanwhile, a twenty-third resistor R23 is also connected to the output end of the first photo-coupler U1. Similarly, the output end of the second comparator A2 is connected to the second photo coupler U2 through a tenth resistor R10, and the output end of the second photo coupler U2 is connected to a twenty-fourth resistor R24.
In this embodiment, a precharge circuit is also connected in parallel to both ends of the main positive contactor K2, and the precharge circuit specifically includes a precharge resistor R0 and a precharge contactor K0 connected in series. In addition, a precharge capacitor C0 is also connected between the output terminal and the ground terminal of the precharge contactor K0, and in a specific design, the fifth resistor R5 and the sixth resistor R6 are also adjustable in resistance. In this way, by setting the precharge capacitor C0 and adjusting the resistances of the fifth resistor R5 and the sixth resistor R6, the precharge state of the battery pack can be detected based on the contact adhesion diagnosis of the main contactor by matching with the settings of the first comparator A1 and the second comparator A2.
In specific implementation, the resistance values of the fifth resistor R5 and the sixth resistor R6 are adjustable, so that the fifth resistor R5 and the sixth resistor R6 can be made of a resistor product with a variable resistance value commonly found in the existing circuit module. In combination with the above-mentioned pre-charging circuit, and based on the adjustable resistance values of the fifth resistor R5 and the sixth resistor R6, the specific detection of the pre-charging state of the battery pack can be referred to as the following description.
In this embodiment, as a preferred embodiment, with continued reference to fig. 1, a first fuse RS1 and a second fuse RS2 arranged in parallel are connected to the output of the main positive contactor K2. The output end of the second fuse RS2 is connected to a fourth voltage divider circuit, and the output end of the first fuse RS1 is connected to a fifth voltage divider circuit, and the main contactor diagnostic circuit of this embodiment further includes a third comparator A3, a fourth comparator A4, and a fifth comparator A5 and a sixth comparator A6.
The third comparator A3 and the fourth comparator A4 are respectively connected with the third voltage dividing circuit and the fourth voltage dividing circuit, and meanwhile, the output ends of the third comparator A3 and the fourth comparator A4 are also connected in parallel. The fifth comparator A5 and the sixth comparator A6 are respectively connected with the third voltage dividing circuit and the fifth voltage dividing circuit, and the output ends of the fifth comparator A5 and the sixth comparator A6 are also connected in parallel. At this time, by the arrangement of the third comparator A3 and the fourth comparator A4, the fifth comparator A5 and the sixth comparator A6, and the related voltage dividing circuit, it is possible to diagnose the on-off states of the two fuses, which is helpful to increase the efficacy of the circuit structure of the present embodiment.
Specifically, the fourth voltage dividing circuit of the present embodiment includes a twenty seventh resistor R27 and a twenty eighth resistor R28 connected in series, the fifth voltage dividing circuit includes a thirty first resistor R31 and a thirty second resistor R32 connected in series, and the twenty eighth resistor R28 and the thirty second resistor R32 are connected to the ground terminal. In the present embodiment, the non-inverting input terminal of the third comparator A3 is connected to the eleventh resistor R11, and the inverting input terminals of the eleventh resistor R11 and the fourth comparator A4 are connected in parallel between the fifth resistor R5 and the sixth resistor R6. A fourteenth resistor R14 is connected to the non-inverting input terminal of the fourth comparator A4, and the fourteenth resistor R14 and the inverting input terminal of the third comparator A3 are connected in parallel between the twenty-seventh resistor R27 and the twenty-eighth resistor R28.
A sixteenth resistor R16 is connected to the non-inverting input terminal of the fifth comparator A5, the sixteenth resistor R16 and the inverting input terminal of the sixth comparator A6 are connected in parallel to a thirteenth resistor R13, and the thirteenth resistor R13 is connected between the fifth resistor R5 and the sixth resistor R6. An eighteenth resistor R18 is connected to the non-inverting input terminal of the sixth comparator A6, and the eighteenth resistor R18 and the inverting input terminal of the fifth comparator A5 are connected in parallel between the thirty-first resistor R31 and the thirty-second resistor R32.
It should be noted that, referring still to fig. 1, after the above-mentioned fourteenth resistor R14 and the inverting input terminal of the third comparator A3 are connected in parallel, the fourth voltage dividing circuit between the twenty-seventh resistor R27 and the twenty-eighth resistor R28 is also connected through the twenty-first resistor R21. After the eighteenth resistor R18 and the inverting input terminal of the fifth comparator A5 are connected in parallel, the fifth voltage dividing circuit is also connected between the thirty-first resistor R31 and the thirty-second resistor R32 through the twenty-second resistor R22.
In addition, in the embodiment, the output end of the third comparator A3 is connected to the second diode D2, the output end of the fourth comparator A4 is connected to the third diode D3, the output ends of the second diode D2 and the third diode D3 are connected in parallel and then also connected to the third photo-coupler U3, and the output end of the third photo-coupler U3 outputs the comparison result of the third comparator A3 and the fourth comparator A4. Similarly, the output end of the fifth comparator A5 is connected with a fourth diode D4, the output end of the sixth comparator A6 is connected with a fifth diode D5, the output ends of the fourth diode D4 and the fifth diode D5 are connected in parallel and then connected with a fourth photo-coupler U4, and the output end of the fourth photo-coupler U4 outputs the comparison result of the fifth comparator A5 and the sixth comparator A6.
In this case, as a preferred embodiment, the output terminals of the second diode D2 and the third diode D3 are connected in parallel, and then connected to the third photo coupler U3 through a nineteenth resistor R19, and the output terminals of the fourth diode D4 and the fifth diode D5 are connected in parallel, and then connected to the fourth photo coupler U4 through a twentieth resistor R20. In addition, similar to the arrangement of the output ends of the first photo-coupler U1 and the second photo-coupler U2 described above, the present embodiment has a twenty-fifth resistor R25 connected to the output end of the third photo-coupler U3, and a twenty-sixth resistor R26 connected to the output end of the fourth photo-coupler U4. Still referring to fig. 1, in the present embodiment, a twelfth resistor R12 is further connected between the non-inverting input terminal and the ground terminal of the third comparator A3, a fifteenth resistor R15 is connected between the non-inverting input terminal and the ground terminal of the fourth comparator A4, and a seventeenth resistor R17 is also connected between the non-inverting input terminal and the ground terminal of the fifth comparator A5.
In addition, the main contactor diagnostic circuit of the present embodiment further includes a sixth voltage dividing circuit connected to the 5V power supply, the sixth voltage dividing circuit specifically includes a twenty-ninth resistor R29 and a thirty-ninth resistor R30 connected in series, the thirty-eighth resistor R30 is connected to the ground terminal, a sixth diode D6 is connected between the sixth voltage dividing circuit and the fourth voltage dividing circuit, and a seventh diode D7 is also connected between the sixth voltage dividing circuit and the fifth voltage dividing circuit.
Specifically, the input terminal of the sixth diode D6 is connected between the twenty-ninth resistor R29 and the thirty-eighth resistor R30, and the output terminal of the sixth diode D6 is connected between the twenty-seventh resistor R27 and the twenty-eighth resistor R28. The input terminal of the seventh diode D7 is also connected between the twenty-ninth resistor R29 and the thirty-second resistor R30, and the output terminal of the seventh diode D7 is connected between the thirty-first resistor R31 and the thirty-second resistor R32.
In this embodiment, as a preferred implementation manner, with continued reference to fig. 1, the main contactor diagnostic circuit further includes a sleep power-up circuit, and the sleep power-up circuit specifically includes a thirty-third resistor R33 and a fifth photo-coupler U5 connected in series between the 5V power supply and the ground. The output end of the fifth photo coupler U5 is connected in series between the input end of the main positive contactor K2 and the first resistor R1, so that the power-up circuit for dormancy can reduce the circuit energy consumption when the whole vehicle and the battery pack are dormant.
In the main contactor diagnostic circuit of this embodiment, in implementation, the above-mentioned contactors, fuses, comparators and photocouplers and the like may be all products commonly used in the field of conventional battery packs, and for example, the above-mentioned comparators may be products with model numbers LM339AD, and the photocouplers may be products with model numbers TLP 521-1.
In addition, in the circuit configuration of the present embodiment, the precharge circuit R0 may generally employ a 33R resistor, the nineteenth resistor R19 and the twentieth resistor R20 may employ a 300R resistor, the ninth resistor R9, the tenth resistor R10 and the thirty third resistor R33 may employ a 500R resistor, the second resistor R2, the fourth resistor R4, the fifth resistor R5, the twenty third resistor to the twenty sixth resistor R23 to R26, and the twenty eighth resistor R28 and the thirty second resistor R32 may employ a 2K resistor. The seventh resistor R7, the eighth resistor R8, the thirteenth resistor R13, the twenty-first resistor R21, the twenty-second resistor R22, the twenty-ninth resistor R29, and the thirty-first resistor R30 may employ 10K of resistance.
The eleventh resistor R11, the fourteenth resistor R14 and the sixteenth resistor R16 may employ 50K of resistance, and the twelfth resistor R12, the fifteenth resistor R15, the seventeenth resistor R17 and the eighteenth resistor R18 may employ 100K of resistance. The sixth resistor R6, the twenty-seventh resistor R27 and the thirty-first resistor R31 may employ a resistor of 190K, the third resistor R3 may employ a resistor of 198K, and the first resistor R1 may employ a resistor of 200K. In addition, the precharge heat may be 1000PF, for example.
When the main contactor diagnostic circuit of the embodiment is used, the outputs of the first to fourth photocouplers U1 to U4, i.e., I/01, I/02, I/03, I/04 are connected with MUCs in a Battery Management System (BMS), and the MUCs determine the adhesion condition of the main contactor contacts according to the output levels of the photocouplers, and meanwhile, the determination of the pre-charging state and the determination of the on-off condition of the two fuses can be performed during pre-charging.
Specifically, in this embodiment, when the outputs of the first to fourth photocouplers U1 to U4, i.e., I/01, I/02, I/03, I/04, are all at high levels, the photocouplers are turned on, which means that the contacts of the main positive contactor K2, the main negative contactor K2, and the precharge contactor K0 are not adhered, and at the same time, the first fuse RS1 and the second fuse RS2 are not broken.
When the contacts of the main negative contactor K1 are adhered, and the contacts of the main positive contactor K2 and the pre-charging contactor K0 are not adhered, the output point I/01 has no output level because a loop is not formed. Based on this, when the contacts of the main negative contactor K1 are not adhered, the main negative contactor K1 is closed, and the output point I/02 is observed within the preset time (for example, 5ms, which can be adjusted according to the specific system design requirement) for closing the main negative contactor K1, if the output of the output point I/02 is not changed, it indicates that the contacts of the main positive contactor K2 are not adhered. If the output of the output point I/02 changes from high to low, the contact point of the main positive contactor K2 is stuck.
Further, after closing the main negative contactor K1, if the outputs of the output points I/01, I/02 are changed from high level to low level at the same time, it is indicated that the contacts of the main positive contactor K2 and the main negative contactor K1 are stuck at the same time. And the pre-charge contactor K0 is closed after the contact of the main negative contactor K1 is not adhered by 20ms (which can be adjusted according to the specific system design requirement), if the output of the output point I/02 is changed from high level to low level in the pre-charge time, the adhesion of the contact of the pre-charge contactor K0 is indicated.
In addition, when the pre-charging is performed, the pre-charging contactor K0 is closed 20ms after the main negative contactor K1 is closed, then the resistance values of the fifth resistor R6 and the sixth resistor R6 are adjusted, the voltage on the pre-charging heat C0 is increased to a certain percentage (for example, 70% according to the specific system design requirement) of the total voltage amplitude of the battery pack, and the output of the output point I/02 is changed from the high level to the low level, so that the pre-charging can be indicated to be completed.
The main contactor diagnosis circuit of the embodiment adopts the circuit structure, and the comparator method can be used for replacing the existing voltage measurement method by arranging the comparator, so that the A/D conversion and SPI isolation communication can be canceled, the high-voltage measurement link is simplified, the communication data volume is reduced, meanwhile, the interference of detection result signals can be avoided, the error of the voltage test result can be avoided, the accuracy of the diagnosis result can be ensured, and the circuit structure has good practicability.
Example two
The present embodiment relates to a battery pack in which the main contactor diagnostic circuit of the first embodiment is provided in a battery management system BMS.
The battery pack of the embodiment can cancel A/D conversion and SPI isolation communication by arranging the main contactor diagnosis circuit of the first embodiment, simplify a high-voltage measurement link, reduce communication data volume, avoid interference of detection result signals, avoid error of a voltage test result, ensure accuracy of the diagnosis result and have good practicability.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. A main contactor diagnostic circuit, characterized by:
the circuit comprises a first voltage dividing circuit connected between the input end of a main positive contactor and the output end of a main negative contactor, a second voltage dividing circuit connected with the input end of the main positive contactor, a third voltage dividing circuit connected with the output end of the main positive contactor, a first comparator and a second comparator;
the first voltage dividing circuit comprises a first resistor and a second resistor which are connected in series, the second voltage dividing circuit comprises a third resistor and a fourth resistor which are connected in series, and the third voltage dividing circuit comprises a fifth resistor and a sixth resistor which are connected in series;
the inverting input end of the first comparator is connected between the first resistor and the second resistor, the non-inverting input end of the first comparator is connected with a 5V power supply, the non-inverting input end of the second comparator is connected between the third resistor and the fourth resistor and is connected with the 5V power supply through a first diode, and the inverting input end of the second comparator is connected between the fifth resistor and the sixth resistor.
2. The main contactor diagnostic circuit according to claim 1, wherein:
the 5V power supply is connected with the non-inverting input end of the first comparator and the first diode through a seventh resistor, and an eighth resistor is connected between the input end of the first diode and the grounding end.
3. The main contactor diagnostic circuit according to claim 1, wherein:
the output end of the first comparator is connected with a first photoelectric coupler, the output end of the second comparator is connected with a second photoelectric coupler, the output end of the first photoelectric coupler outputs the comparison result of the first comparator, and the output end of the second photoelectric coupler outputs the comparison result of the second comparator.
4. The main contactor diagnostic circuit according to claim 1, wherein:
the two ends of the main positive contactor are connected in parallel with a pre-charging circuit, and the pre-charging circuit comprises a pre-charging resistor and a pre-charging contactor which are connected in series;
and a pre-charge capacitor is connected between the output end and the grounding end of the pre-charge contactor, and the resistance values of the fifth resistor and the sixth resistor are adjustable.
5. The main contactor diagnostic circuit according to claim 1, wherein:
the output end of the main positive contactor is connected with a first fuse and a second fuse which are arranged in parallel, the output end of the second fuse is connected with a fourth voltage dividing circuit, the output end of the first fuse is connected with a fifth voltage dividing circuit, and the main contactor diagnosis circuit further comprises a third comparator, a fourth comparator, a fifth comparator and a sixth comparator;
the third comparator and the fourth comparator are respectively connected with the third voltage dividing circuit and the fourth voltage dividing circuit, the output ends of the third comparator and the fourth comparator are connected in parallel, the fifth comparator and the sixth comparator are respectively connected with the third voltage dividing circuit and the fifth voltage dividing circuit, and the output ends of the fifth comparator and the sixth comparator are connected in parallel.
6. The main contactor diagnostic circuit according to claim 5, wherein:
the fourth voltage dividing circuit comprises a twenty-seventh resistor and a twenty-eighth resistor which are connected in series, and the fifth voltage dividing circuit comprises a thirty-first resistor and a thirty-second resistor which are connected in series;
the non-inverting input end of the third comparator is connected with an eleventh resistor, the eleventh resistor and the inverting input end of the fourth comparator are connected in parallel between the fifth resistor and the sixth resistor, the non-inverting input end of the fourth comparator is connected with a fourteenth resistor, and the fourteenth resistor and the inverting input end of the third comparator are connected in parallel between the twenty-seventh resistor and the twenty-eighth resistor;
the non-inverting input end of the fifth comparator is connected with a sixteenth resistor, the sixteenth resistor and the inverting input end of the sixth comparator are connected in parallel with a thirteenth resistor, the thirteenth resistor is connected between the fifth resistor and the sixth resistor, the non-inverting input end of the sixth comparator is connected with an eighteenth resistor, and the eighteenth resistor and the inverting input end of the fifth comparator are connected in parallel between the thirty-first resistor and the thirty-second resistor.
7. The main contactor diagnostic circuit according to claim 6, wherein:
the output end of the third comparator is connected with a second diode, the output end of the fourth comparator is connected with a third diode, the output ends of the second diode and the third diode are connected in parallel and then connected with a third photoelectric coupler, and the output end of the third photoelectric coupler outputs comparison results of the third comparator and the fourth comparator;
the output end of the fifth comparator is connected with a fourth diode, the output end of the sixth comparator is connected with a fifth diode, the fourth diode and the output end of the fifth diode are connected in parallel and then connected with a fourth photoelectric coupler, and the output end of the fourth photoelectric coupler outputs comparison results of the fifth comparator and the sixth comparator.
8. The main contactor diagnostic circuit according to claim 6, wherein:
a twelfth resistor is connected between the non-inverting input end and the grounding end of the third comparator, a fifteenth resistor is connected between the non-inverting input end and the grounding end of the fourth comparator, and a seventeenth resistor is connected between the non-inverting input end and the grounding end of the fifth comparator;
the main contactor diagnosis circuit further comprises a sixth voltage division circuit connected with a 5V power supply, the sixth voltage division circuit comprises a twenty-ninth resistor and a thirty-ninth resistor which are connected in series, a sixth diode is connected between the sixth voltage division circuit and the fourth voltage division circuit, and a seventh diode is connected between the sixth voltage division circuit and the fifth voltage division circuit.
9. The main contactor diagnostic circuit according to any one of claims 1 to 8, wherein:
the main contactor diagnostic circuit further comprises a dormant power-on circuit, wherein the dormant power-on circuit comprises a thirty-third resistor and a fifth photoelectric coupler which are connected in series between a 5V power supply and a ground terminal, and the output terminal of the fifth photoelectric coupler is connected in series between the input terminal of the main positive contactor and the first resistor.
10. A battery pack, characterized in that:
a battery management system of the battery pack provided with the main contactor diagnostic circuit of any one of claims 1 to 9.
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| CN202223552324.5U CN219201857U (en) | 2022-12-29 | 2022-12-29 | Main contactor diagnostic circuit and battery pack |
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| CN202223552324.5U CN219201857U (en) | 2022-12-29 | 2022-12-29 | Main contactor diagnostic circuit and battery pack |
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