CN213292000U - High-voltage sampling circuit, battery management system and electric automobile - Google Patents
High-voltage sampling circuit, battery management system and electric automobile Download PDFInfo
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- CN213292000U CN213292000U CN202022261791.7U CN202022261791U CN213292000U CN 213292000 U CN213292000 U CN 213292000U CN 202022261791 U CN202022261791 U CN 202022261791U CN 213292000 U CN213292000 U CN 213292000U
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The utility model relates to a high pressure sampling circuit, battery management system and electric automobile, including the main positive relay sampling circuit who is connected with positive bus, the main negative relay sampling circuit who is connected with negative bus and the total pressure sampling circuit of power battery group who is connected with power battery group; the main negative relay sampling circuit comprises a second optical relay, a third resistor, a fourth resistor and a ninth resistor; the first end of the second optical relay is connected with the positive electrode bus, the second end of the second optical relay is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the negative electrode bus, the first end of the ninth resistor is connected with the second end of the third resistor, the second end of the ninth resistor is connected with the non-battery side of the main negative relay, and a second voltage collecting point is arranged between the third resistor and the fourth resistor. The utility model discloses with low costs and can carry out multichannel high pressure sampling safely, conveniently, stability is higher when negative pole relay detects.
Description
Technical Field
The utility model relates to a battery management technical field especially relates to a high pressure sampling circuit, battery management system and electric automobile.
Background
In the process of electric vehicle development, the technology facing great difficulty is the manufacturing technology and battery management technology of the battery. Under the condition that the battery manufacturing process cannot be greatly improved in the global battery industry, the management technology of the battery is the core technology for ensuring the efficient use of the battery and prolonging the service life of the battery.
The detection of the total voltage, the current and the insulation performance of the power battery is the most important part of a high-voltage detection system and is the direct reflection of the working state of the whole battery. The detection of the total voltage of the battery pack is the most basic and important function, the purpose is to provide the most basic data for monitoring the basic state of the battery, and the functions of monitoring the total voltage of the battery pack and diagnosing the state of the high-voltage relay are achieved.
The total pressure detection of the battery pack is the most direct battery output state detection, the state of the battery pack can be monitored in real time, the connection fault of a system is judged, and the state of a high-voltage relay is judged. The relay adhesion detection is used for identifying whether the high-voltage relay has faults or not, so that the high-voltage relay is uncontrollable (cannot be closed or opened), and the relay adhesion detection is very important in the design of driving safety of an electric vehicle. The method for detecting the relay adhesion is also different in size, the on or off state of the high-voltage relay is identified by detecting the voltage before and after the high-voltage relay, and the general voltage detection and the adhesion detection function are combined together. However, with the increase of the number of high-voltage relays, the voltage detection circuit and the diagnosis logic become more and more complex, the cost remains high, and the relay adhesion detection of the negative electrode is a difficult point.
SUMMERY OF THE UTILITY MODEL
In view of this, the high-pressure road number that needs to detect for battery package high-pressure system increases in order to solve more and more complicated whole car electrical system, and the material cost of the battery management system that leads to increases and the problem that the relay adhesion detection stability of negative pole is low, the utility model provides a high-pressure sampling circuit, battery management system and electric automobile.
In order to achieve the above object, a first aspect of the embodiments of the present invention provides a high voltage sampling circuit, which includes, as one implementation manner, a main positive relay sampling circuit connected to a positive bus, a main negative relay sampling circuit connected to a negative bus, and a total voltage sampling circuit of a power battery pack connected to the power battery pack, where the main negative relay sampling circuit includes a second photo relay, a third resistor, a fourth resistor, and a ninth resistor; the first end of the second optical relay is connected with the positive electrode bus, the second end of the second optical relay is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the negative electrode bus, the first end of the ninth resistor is connected with the second end of the third resistor, the second end of the ninth resistor is connected with the non-battery side of the main negative relay, and a second voltage collecting point is arranged between the third resistor and the fourth resistor.
As one embodiment, the total pressure sampling circuit of the power battery pack comprises a first optical relay, a first resistor and a second resistor; the first end of the first optical relay is connected with the positive bus, the second end of the first optical relay is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the negative bus, and a first voltage collecting point is arranged between the first resistor and the second resistor.
As one embodiment, the main positive relay sampling circuit comprises a twelfth resistor and a thirteenth resistor; the first end of the twelfth resistor is connected with the non-battery side of the main positive relay, the second end of the twelfth resistor is connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is connected with the negative electrode bus, and a fifth voltage collecting point is arranged between the twelfth resistor and the thirteenth resistor.
As one embodiment, the high-voltage sampling circuit further includes a first positive charging line connected to the positive bus, a first negative charging line connected to the negative bus, a first negative charging relay disposed on the first negative charging line, and a fifth resistor, a sixth resistor, and a tenth resistor; the first end of the fifth resistor is connected with the second end of the second optical relay, the second end of the fifth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the negative electrode bus, the first end of the tenth resistor is connected with the second end of the fifth resistor, the second end of the tenth resistor is connected with the non-battery side of the first charging negative relay, and a third voltage collecting point is arranged between the fifth resistor and the sixth resistor.
As one embodiment, the high voltage sampling circuit further includes a first charging positive relay, a fourteenth resistor and a fifteenth resistor disposed on the positive first charging line; a first end of the fourteenth resistor is connected to the non-battery side of the first charging positive relay, a second end of the fourteenth resistor is connected to a first end of the fifteenth resistor, a second end of the fifteenth resistor is connected to the negative bus, and a sixth voltage collecting point is arranged between the fourteenth resistor and the fifteenth resistor.
As one embodiment, the high-voltage sampling circuit further includes a second positive charging line connected to the positive bus, a second negative charging line connected to the negative bus, a second charging negative relay disposed on the second negative charging line, and a seventh resistor, an eighth resistor, and an eleventh resistor; the first end of the seventh resistor is connected with the second end of the second optical relay, the second end of the seventh resistor is connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the negative electrode bus, the first end of the eleventh resistor is connected with the second end of the seventh resistor, the second end of the eleventh resistor is connected with the non-battery side of the second charge negative relay, and a fourth voltage collecting point is arranged between the seventh resistor and the eighth resistor.
As one embodiment, the high voltage sampling circuit further includes a second charging positive relay, a sixteenth resistor and a seventeenth resistor disposed on the positive second charging line; the first end of the sixteenth resistor is connected with the non-battery side of the second charging positive relay, the second end of the sixteenth resistor is connected with the first end of the seventeenth resistor, the second end of the seventeenth resistor is connected with the negative bus, and a seventh voltage collecting point is arranged between the sixteenth resistor and the seventeenth resistor.
In order to achieve the above object, a second aspect of the present invention provides a battery management system, as one implementation manner, the battery management system includes a switch gating module, an a/D sampling module, a data processing module, and a high voltage sampling circuit according to any of the above implementation manners;
the switch gating module is used for gating a voltage acquisition point and outputting the voltage of the voltage acquisition point to the A/D sampling module;
the A/D sampling module is used for performing analog-to-digital conversion on the voltage of the voltage acquisition point and outputting the voltage to the data processing module;
the data processing module is used for controlling the switch gating module and the A/D sampling module and determining the state of each relay according to the acquired voltage data.
As one embodiment, the battery management system further comprises a communication isolation module, the command sent by the data processing module is isolated by the communication isolation module and then sent to the switch gating module and the a/D sampling module, and the a/D sampling module converts the acquired analog quantity into a digital quantity and transmits the digital quantity to the data processing module through the communication isolation module.
In one embodiment, the communication isolation module is an SPI digital communication isolator.
As one embodiment, the switch gating module includes a plurality of logic electronic switch chips, one end of each of the plurality of logic electronic switch chips is sequentially connected to a voltage collecting point, and the other end of each of the plurality of logic electronic switch chips is connected to the a/D sampling module.
In order to achieve the above object, a third aspect of the embodiments of the present invention provides an electric vehicle, which includes the battery management system according to any one of the above embodiments as one of the embodiments.
To sum up, the utility model provides a high pressure sampling circuit, battery management system and electric automobile, including the main positive relay sampling circuit who is connected with the positive bus, the main negative relay sampling circuit who is connected with the negative bus and the total pressure sampling circuit of power battery group who is connected with the power battery group; the main negative relay sampling circuit comprises a second optical relay, a third resistor, a fourth resistor and a ninth resistor; the first end of the second optical relay is connected with the positive electrode bus, the second end of the second optical relay is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the negative electrode bus, the first end of the ninth resistor is connected with the second end of the third resistor, the second end of the ninth resistor is connected with the non-battery side of the main negative relay, and a second voltage collecting point is arranged between the third resistor and the fourth resistor. The utility model discloses with low costs and can carry out multichannel high pressure sampling safely, conveniently, especially when carrying out the state detection of negative pole relay, stability is higher.
Drawings
Fig. 1 is a schematic diagram of a high voltage sampling circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a battery management system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments, and are only used for explaining the present invention, and are not used for limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Referring to fig. 1, fig. 1 is a schematic diagram of a high voltage sampling circuit according to an embodiment of the present invention. As shown in fig. 1, the high-voltage sampling circuit includes a main positive relay sampling circuit connected to the positive bus, a main negative relay sampling circuit connected to the negative bus, and a total voltage sampling circuit of the power battery pack connected to the power battery pack; the main negative relay sampling circuit comprises a second optical relay S2, a third resistor R3, a fourth resistor R4 and a ninth resistor R9; the first end of the second optical relay S2 is connected with the positive bus, the second end of the second optical relay S2 is connected with the first end of the third resistor R3, the second end of the third resistor R3 is connected with the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected with the negative bus, the first end of the ninth resistor R9 is connected with the second end of the third resistor R3, the second end of the ninth resistor R9 is connected with the non-battery side of the main negative relay K2, and a second voltage collecting point is arranged between the third resistor R3 and the fourth resistor R4.
In one embodiment, the power battery pack sampling circuit comprises a first optical relay S1, a first resistor R1 and a second resistor R2; the first end of the first optical relay S1 is connected with the positive bus, the second end of the first optical relay S1 is connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the first end of the second resistor R2, the second end of the second resistor R2 is connected with the negative bus, and a first voltage collecting point is arranged between the first resistor R1 and the second resistor R2.
In one embodiment, the main positive relay sampling circuit includes a twelfth resistor R12 and a thirteenth resistor R13; the first end of a twelfth resistor R12 is connected with the non-battery side of the main positive relay K1, the second end of the twelfth resistor R12 is connected with the first end of a thirteenth resistor R13, the second end of the thirteenth resistor R13 is connected with a negative bus, and a fifth voltage collecting point is arranged between the twelfth resistor R12 and the thirteenth resistor R13.
Specifically, the control sides of the relays are all connected with the controller, the driving side of the main positive relay K1 is connected with the positive electrode of the high-voltage source (power battery pack), the driving side of the main negative relay K2 is connected with the negative electrode of the high-voltage source (power battery pack), and the load motor M is connected between the main positive relay K1 and the non-battery side of the main negative relay K2. The first voltage acquisition point arranged between the first resistor R1 and the second resistor R2 is a total pressure sample of the power battery pack, and the total pressure of the power battery pack is obtained by calculation according to a voltage division network of the first resistor R1 and the second resistor R2, that is, the voltage acquired by the first voltage acquisition point is the voltage division of the first resistor R1 and the second resistor R2 on the total pressure of the power battery pack. The second voltage collecting point is arranged between the third resistor R3 and the fourth resistor R4 and used for sampling the state of the main negative relay K2, and the fifth voltage collecting point is arranged between the twelfth resistor R12 and the thirteenth resistor R13 and used for sampling the state of the main positive relay K1, namely, whether the relay is in a closed state or an open state is detected, so that adhesion detection is carried out on the relay.
For example, when the state of the main negative relay K2 is detected, the sampling result is obtained by voltage division detection of the third resistor R3 after the fourth resistor R4 and the ninth resistor R9 are connected in parallel, and the working state of the main negative relay K2 is detected through the second voltage acquisition point after the second optical relay S2 is closed. When the open circuit is judged, the second optical relay S2 is closed, the voltage collected by the second voltage collecting point is the partial voltage of the third resistor R3 and the fourth resistor R4 on the total voltage of the power battery pack, and the collecting value is set as V1. In the closing judgment: and (3) closing the second optical relay S2, wherein the voltage collected by the second voltage collecting point is the voltage of the total voltage of the power battery pack, which is formed by connecting a fourth resistor R4, a ninth resistor R9 in parallel and then connecting a third resistor R3 in series, and the collecting value is V2. When the detection logic detects the state of the main negative relay K2, the working state of the main negative relay K2 is judged by one large voltage value and one small voltage value (both larger than 0V), and the stability is higher. In one embodiment, V2 is 0.6 × V1 according to a predetermined circuit design ratio, but may be other design ratios.
The high-voltage sampling circuit that this embodiment provided just can realize multichannel high-pressure sampling and multichannel relay state sampling safely conveniently through two photo relays and a plurality of divider resistance, compare in traditional high-pressure cross detection (every high-voltage point all has a photo relay of the same kind) the material cost that has significantly reduced, in the high-voltage electrical system who has main positive relay K1 and main negative relay K2, can realize same effect with the cross detection scheme, especially when carrying out negative relay state detection, have higher stability.
It should be noted that the first optical relay S1, the first resistor R1 and the second resistor R2 are not limited to this circuit structure as the total pressure sampling circuit of the power battery pack, and those skilled in the art can certainly adopt other embodiments within the scope of the present invention.
In one embodiment, the high voltage sampling circuit further comprises a positive first charging wire connected to the positive bus, a negative first charging wire connected to the negative bus, a first charging positive relay K3 disposed on the positive first charging wire, a first charging negative relay K4 disposed on the negative first charging wire, and a fifth resistor R5, a sixth resistor R6, a tenth resistor R10, a fourteenth resistor R14 and a fifteenth resistor R15, wherein the first end of the fifth resistor R5 is connected with the second end of the second optical relay S2, the second end of the fifth resistor R5 is connected with the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected with a negative bus, the first end of the tenth resistor R10 is connected with the second end of the fifth resistor R5, the second end of the tenth resistor R10 is connected with the non-battery side of the first charge negative relay K4, and a third voltage collecting point is arranged between the fifth resistor R5 and the sixth resistor R6; a first end of the fourteenth resistor R14 is connected to the non-battery side of the first charging positive relay K3, a second end of the fourteenth resistor R14 is connected to a first end of the fifteenth resistor R15, a second end of the fifteenth resistor R15 is connected to the negative bus, and a sixth voltage collecting point is provided between the fourteenth resistor R14 and the fifteenth resistor R15.
In one embodiment, the high voltage sampling circuit further comprises a positive second charging wire connected to the positive bus, a negative second charging wire connected to the negative bus, a second charging positive relay K5 arranged on the positive second charging wire, a second charging negative relay K6 arranged on the negative second charging wire, and a seventh resistor R7, an eighth resistor R8, an eleventh resistor R11, a sixteenth resistor R16 and a seventeenth resistor R17, wherein a first end of the seventh resistor R7 is connected with a second end of the second optical relay S2, a second end of the seventh resistor R7 is connected with a first end of the eighth resistor R8, a second end of the eighth resistor R8 is connected with a negative bus, a first end of the eleventh resistor R11 is connected with a second end of the seventh resistor R7, a second end of the eleventh resistor R11 is connected with the non-battery side of the second charge negative relay K6, and a fourth voltage collecting point is arranged between the seventh resistor R7 and the eighth resistor R8; the first end of a sixteenth resistor R16 is connected with the non-battery side of the second charging positive relay K5, the second end of the sixteenth resistor R16 is connected with the first end of a seventeenth resistor R17, the second end of the seventeenth resistor R17 is connected with a negative bus, and a seventh voltage collecting point is arranged between the sixteenth resistor R16 and the seventeenth resistor R17.
It is worth mentioning that, the first charging wire and the second charging wire may be both a fast charging line or a slow charging line, and may also be a fast charging line or a slow charging line, which is not limited herein. What be connected between anodal charging wire (anodal first charging wire or anodal second charging wire) and the negative pole charging wire (the first charging wire of negative pole or negative pole second charging wire) is on-vehicle machine C that charges, generally slowly fills for exchanging slowly, and alternating-current charging stake does not have power conversion module, does not do alternating current-direct current conversion, and its direct output alternating current inserts in the car, imports the battery after changing into the direct current through on-vehicle machine C that charges on the car. And the quick charging mode generally adopts special non-vehicle-mounted direct current charger C to charge, and this kind of charger C installs in fixed charging station, is connected with alternating current input power, therefore if first charging wire was for the quick charging circuit in fig. 1, the charger C that is connected between anodal first charging wire and the first charging wire of negative pole can be understood as non-vehicle-mounted direct current charger C. It should be noted that the utility model provides a high pressure sampling circuit can also include other relays to corresponding resistance voltage divider network of setting like quick charge relay and slow charge relay, in order to carry out voltage acquisition, for example thermal management relay etc..
In one embodiment, the high voltage sampling circuit further comprises a pre-charge main relay K and a series resistor R thereof connected in parallel to the main positive relay K1.
Specifically, the pre-charging relay K and the series resistor R form a pre-charging loop to ensure the safety of the circuit. Because the front end of the battery is provided with a large capacitor, if a pre-charging loop is not provided, the main positive relay K1 is directly connected with the capacitor at the moment of connection, the voltage of the battery is high, the voltage on the capacitor is close to 0, namely, the capacitor is in instant short circuit, the load resistor is a wire and relay contact resistor, the resistance value is very small, the instant current can reach ten thousand amperes, and the main positive relay K1 is damaged at the moment.
In one embodiment, the power battery pack further includes a manual service switch (MSD) for disconnecting the voltage between the power battery pack outputs.
Specifically, the manual Maintenance Switch (MSD) is used to disconnect the high-voltage circuit, so that maintenance and other work can be in a safer state, or the connection of the high-voltage circuit can be quickly disconnected in case of sudden short circuit.
To sum up, the utility model provides a high-voltage sampling circuit, including the main positive relay sampling circuit who is connected with the positive bus, the main negative relay sampling circuit who is connected with the negative bus and the power battery group total pressure sampling circuit who is connected with the power battery group; the main negative relay sampling circuit comprises a second optical relay, a third resistor, a fourth resistor and a ninth resistor; the first end of the second optical relay is connected with the positive electrode bus, the second end of the second optical relay is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the negative electrode bus, the first end of the ninth resistor is connected with the second end of the third resistor, the second end of the ninth resistor is connected with the non-battery side of the main negative relay, and a second voltage collecting point is arranged between the third resistor and the fourth resistor. The utility model discloses with low costs and can carry out multichannel high pressure sampling fast safely, conveniently, especially when carrying out the state detection of negative pole relay, stability is higher.
Referring to fig. 2, fig. 2 is a schematic diagram of a battery management system according to an embodiment of the present invention. As shown in fig. 2, the battery management system includes a switch gating module 20, an a/D sampling module 21, a data processing module 23, and the high voltage sampling circuit of any of the above embodiments; the switch gating module 20 is connected with each voltage acquisition point of the high-voltage sampling circuit and used for gating the voltage acquisition points and outputting the voltage of the voltage acquisition points to the A/D sampling module 21; the A/D sampling module 21 is used for performing analog-to-digital conversion on the voltage of the voltage acquisition point and outputting the voltage to the data processing module 23; the data processing module 23 is used for controlling the switch gating module 20 and the a/D sampling module 21, and determining the state of each relay according to the acquired voltage data.
It should be noted that the data processing module 23 may be a CPU or an MCU, and the data processing module 23 monitors the voltage of the power battery pack according to the voltage data obtained by the high-voltage sampling circuit, and analyzes the voltage data to obtain the states of the relays.
In an embodiment, the battery management system further includes a communication isolation module 22, an instruction sent by the data processing module 23 is isolated by the communication isolation module 22 and then sent to the switch gating module 20 and the a/D sampling module 21, and the a/D sampling module 21 converts the acquired analog quantity into a digital quantity and transmits the digital quantity to the data processing module 23 through the communication isolation module 22.
In one embodiment, the communication isolation module 22 is an SPI digital communication isolator.
In one embodiment, the switch gating module 20 includes a plurality of logic electronic switch chips, one end of each of which is sequentially connected to the voltage collecting point, and the other end of each of which is connected to the a/D sampling module 21.
To sum up, the battery management system that this embodiment provided can realize multichannel high pressure sampling and multichannel relay state sampling safely conveniently, compares and has reduced the material cost greatly in traditional high-pressure cross detection (every high-pressure point all has a light relay all the way), in the high-voltage electrical system who has main positive relay K1 and main negative relay K2, can realize same effect with the cross detection scheme, especially when carrying out the state detection of negative pole relay, stability is higher.
The embodiment of the utility model provides a still provide an electric automobile, this electric automobile includes above-mentioned arbitrary embodiment battery management system.
Through the detailed description of the high-voltage sampling circuit and the battery management, it can be known that the electric automobile provided by the embodiment can safely and conveniently realize multi-path high-voltage sampling and multi-path relay state sampling, compared with the traditional high-voltage cross detection (each high-voltage point has one path of optical relay), the material cost is greatly reduced, in a high-voltage electric system with a main positive relay K1 and a main negative relay K2, the same effect can be realized as the cross detection scheme, and particularly, when the state of a negative relay is detected, the stability is higher.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention, and can be modified to various simple variants, and these simple variants all belong to the protection scope of the present invention.
Claims (12)
1. A high-voltage sampling circuit comprises a main positive relay sampling circuit connected with a positive bus, a main negative relay sampling circuit connected with a negative bus and a total pressure sampling circuit of a power battery pack connected with the power battery pack, and is characterized in that the main negative relay sampling circuit comprises a second optical relay, a third resistor, a fourth resistor and a ninth resistor;
the first end of the second optical relay is connected with the positive electrode bus, the second end of the second optical relay is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the negative electrode bus, the first end of the ninth resistor is connected with the second end of the third resistor, the second end of the ninth resistor is connected with the non-battery side of the main negative relay, and a second voltage collecting point is arranged between the third resistor and the fourth resistor.
2. The high-voltage sampling circuit according to claim 1, wherein the total voltage sampling circuit of the power battery pack comprises a first optical relay, a first resistor and a second resistor; wherein the content of the first and second substances,
the first end of the first optical relay is connected with the positive bus, the second end of the first optical relay is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the negative bus, and a first voltage collecting point is arranged between the first resistor and the second resistor.
3. The high voltage sampling circuit of claim 1 or 2, wherein the main positive relay sampling circuit comprises a twelfth resistor and a thirteenth resistor; the first end of the twelfth resistor is connected with the non-battery side of the main positive relay, the second end of the twelfth resistor is connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is connected with the negative electrode bus, and a fifth voltage collecting point is arranged between the twelfth resistor and the thirteenth resistor.
4. The high voltage sampling circuit according to claim 1 or 2, further comprising a first positive charging wire connected to the positive bus, a first negative charging wire connected to the negative bus, a first negative charging relay disposed on the first negative charging wire, and a fifth resistor, a sixth resistor, and a tenth resistor;
the first end of the fifth resistor is connected with the second end of the second optical relay, the second end of the fifth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the negative electrode bus, the first end of the tenth resistor is connected with the second end of the fifth resistor, the second end of the tenth resistor is connected with the non-battery side of the first charging negative relay, and a third voltage collecting point is arranged between the fifth resistor and the sixth resistor.
5. The high voltage sampling circuit of claim 4, further comprising a first charging positive relay, a fourteenth resistor and a fifteenth resistor disposed on the positive first charging line; a first end of the fourteenth resistor is connected to the non-battery side of the first charging positive relay, a second end of the fourteenth resistor is connected to a first end of the fifteenth resistor, a second end of the fifteenth resistor is connected to the negative bus, and a sixth voltage collecting point is arranged between the fourteenth resistor and the fifteenth resistor.
6. The high voltage sampling circuit according to claim 1 or 2, further comprising a second positive charging wire connected to the positive bus, a second negative charging wire connected to the negative bus, a second negative charging relay disposed on the second negative charging wire, and a seventh resistor, an eighth resistor, and an eleventh resistor;
the first end of the seventh resistor is connected with the second end of the second optical relay, the second end of the seventh resistor is connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the negative electrode bus, the first end of the eleventh resistor is connected with the second end of the seventh resistor, the second end of the eleventh resistor is connected with the non-battery side of the second charge negative relay, and a fourth voltage collecting point is arranged between the seventh resistor and the eighth resistor.
7. The high voltage sampling circuit of claim 6, further comprising a second charging positive relay, a sixteenth resistor, and a seventeenth resistor disposed on the positive second charging line; the first end of the sixteenth resistor is connected with the non-battery side of the second charging positive relay, the second end of the sixteenth resistor is connected with the first end of the seventeenth resistor, the second end of the seventeenth resistor is connected with the negative bus, and a seventh voltage collecting point is arranged between the sixteenth resistor and the seventeenth resistor.
8. A battery management system comprising a switch gating module, an a/D sampling module, a data processing module, and a high voltage sampling circuit according to any one of claims 1 to 7;
the switch gating module is used for gating a voltage acquisition point and outputting the voltage of the voltage acquisition point to the A/D sampling module;
the A/D sampling module is used for performing analog-to-digital conversion on the voltage of the voltage acquisition point and outputting the voltage to the data processing module;
the data processing module is used for controlling the switch gating module and the A/D sampling module and determining the state of each relay according to the acquired voltage data.
9. The battery management system of claim 8, further comprising a communication isolation module, wherein the command sent by the data processing module is isolated by the communication isolation module and then sent to the switch gating module and the a/D sampling module, and the a/D sampling module converts the collected analog quantity into a digital quantity and transmits the digital quantity to the data processing module through the communication isolation module.
10. The battery management system of claim 9, wherein the communication isolation module is an SPI digital communication isolator.
11. The battery management system according to any one of claims 8 to 10, wherein the switch gating module comprises a plurality of logic electronic switch chips, one end of each logic electronic switch chip is sequentially connected with the voltage collecting point, and the other end of each logic electronic switch chip is connected with the A/D sampling module.
12. An electric vehicle characterized in that it comprises a battery management system according to any one of claims 8 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022261791.7U CN213292000U (en) | 2020-10-12 | 2020-10-12 | High-voltage sampling circuit, battery management system and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022261791.7U CN213292000U (en) | 2020-10-12 | 2020-10-12 | High-voltage sampling circuit, battery management system and electric automobile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933697A (en) * | 2021-10-13 | 2022-01-14 | 广州小鹏汽车科技有限公司 | Diagnostic device, diagnostic method and vehicle |
| CN113933575A (en) * | 2021-10-13 | 2022-01-14 | 广州小鹏汽车科技有限公司 | Sampling device, diagnosis method and vehicle |
| CN114019360A (en) * | 2021-10-27 | 2022-02-08 | 智新控制系统有限公司 | Multi-relay diagnostic system and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933697A (en) * | 2021-10-13 | 2022-01-14 | 广州小鹏汽车科技有限公司 | Diagnostic device, diagnostic method and vehicle |
| CN113933575A (en) * | 2021-10-13 | 2022-01-14 | 广州小鹏汽车科技有限公司 | Sampling device, diagnosis method and vehicle |
| CN113933575B (en) * | 2021-10-13 | 2023-10-31 | 广州小鹏汽车科技有限公司 | Sampling device, diagnosis method and vehicle |
| CN113933697B (en) * | 2021-10-13 | 2023-10-31 | 广州小鹏汽车科技有限公司 | Diagnostic device, diagnostic method and vehicle |
| CN114019360A (en) * | 2021-10-27 | 2022-02-08 | 智新控制系统有限公司 | Multi-relay diagnostic system and method |
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