CN212529324U - Contactor state determination device and vehicle - Google Patents
Contactor state determination device and vehicle Download PDFInfo
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- CN212529324U CN212529324U CN202021261609.1U CN202021261609U CN212529324U CN 212529324 U CN212529324 U CN 212529324U CN 202021261609 U CN202021261609 U CN 202021261609U CN 212529324 U CN212529324 U CN 212529324U
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Abstract
The disclosure relates to a contactor state determination device and a vehicle, which are used for improving the real-time performance, safety and accuracy of battery pack contactor state determination. The contactor state determination device includes: the system comprises a voltage division module, an acquisition module, an isolation control module, a low-voltage power supply module and a processor, wherein electrical isolation exists in the isolation control module, and the low-voltage power supply module is used for providing a low-voltage power supply to the outside; one end of the voltage division module is connected with a first acquisition point, and the other end of the voltage division module is connected with a first acquisition end of the acquisition module; the second acquisition end of the acquisition module is connected with a second acquisition point; the first input end of the isolation control module is connected with the first acquisition end of the acquisition module, the second input end of the isolation control module is connected with the second acquisition point, the first output end of the isolation control module is connected with the low-voltage power supply module and the processor, and the second output end of the isolation control module is grounded; the processor is used for determining the opening and closing state of the target contactor according to the level of the collected electric signal.
Description
Technical Field
The present disclosure relates to the field of batteries, and in particular, to a contactor state determination device and a vehicle.
Background
The contactor is a key component in an electric automobile power transmission system, adhesion faults can occur in the process of closing and opening the contactor, the control safety of the whole automobile is affected, and even the safety of personnel on the automobile and personnel around the automobile can be threatened, so that the accurate judgment of the state of the contactor plays an important role in ensuring the safety of the whole automobile.
At present, generally, voltage acquisition is carried out to each acquisition point in the positive pole of high-voltage output to the high-voltage negative pole return circuit, then through carrying out the comparison to the voltage value who gathers in order to confirm the contactor state, but this kind of mode has the problem of contactor adhesion false alarm, also has the problem that easily leads to the circuit board to burn simultaneously, and accuracy and reliability are not enough.
SUMMERY OF THE UTILITY MODEL
The purpose of this disclosure is to provide a contactor state determination device and vehicle to promote battery package contactor state determination's real-time, security and accuracy.
In order to achieve the above object, according to a first aspect of the present disclosure, there is provided a contactor state determination device including: the system comprises a voltage division module, an acquisition module, an isolation control module, a low-voltage power supply module and a processor, wherein electrical isolation exists in the isolation control module, and the low-voltage power supply module is used for providing a low-voltage power supply to the outside;
one end of the voltage division module is connected with a first acquisition point, the other end of the voltage division module is connected with a first acquisition end of the acquisition module, and the first acquisition point is positioned in the two poles of the battery pack and is far away from one pole of a target contactor in a state to be determined;
a second acquisition end of the acquisition module is connected with a second acquisition point, and the second acquisition point is positioned outside the target contactor;
the first input end of the isolation control module is connected with the first acquisition end of the acquisition module, the second input end of the isolation control module is connected with the second acquisition point, the first output end of the isolation control module is connected with the low-voltage power supply module and the processor, the second output end of the isolation control module is grounded, and the isolation control module is used for acquiring the voltage of the acquisition module through the first input end and the second input end and outputting the voltage through the first output end and the second output end;
the processor is used for determining the opening and closing state of the target contactor according to the level of the collected electric signal from the first output end of the isolation control module.
Optionally, the isolation control module is a photoelectric coupler, the isolation control module includes a light emitting source and a light receiving device, an anode of the light emitting source is a first input end of the isolation control module, a cathode of the light emitting source is a second input end of the isolation control module, and two paths of the light receiving device are respectively a first output end and a second output end of the isolation control module.
Optionally, the voltage dividing module is composed of at least one first resistor, and each first resistor of the voltage dividing module is connected in series.
Optionally, a first input end of the isolation control module is connected to a first collecting end of the collecting module through a first current limiting module, and the first current limiting module is configured to reduce a current flowing through the isolation control module.
Optionally, the first output terminal of the isolation control module is connected to the processor through a second current limiting module, and the second current limiting module is configured to reduce a current flowing into the processor.
Optionally, the low-voltage power supply module includes a low-voltage power supply and a second resistor, and the low-voltage power supply is connected to the first output end of the isolation control module through the second resistor.
Optionally, the collection module is a third resistor with a high withstand voltage value.
Optionally, the processor is configured to:
if the collected electric signal from the first output end of the isolation control module is a high-level signal, determining that the target contactor is disconnected;
and if the collected electric signal from the first output end of the isolation control module is a low-level signal, determining that the target contactor is closed.
Optionally, the processor is configured to:
before a vehicle is subjected to high voltage, if the collected electric signal from the first output end of the isolation control module is a low-level signal, outputting first alarm information, wherein the first alarm information is used for prompting that the target contactor has adhesion fault; and/or the presence of a gas in the gas,
after the vehicle is subjected to high voltage, if the collected electric signal from the first output end of the isolation control module is a low-level signal, second alarm information is output and used for prompting the target contactor to generate adhesion faults.
According to a second aspect of the present disclosure, there is provided a vehicle including the contactor state determination device according to the first aspect of the present disclosure.
By the technical scheme, the state of the contactor can be determined in real time, and the problem that the state of the contactor can be determined only when the contactor is electrified in the prior art is solved; the collected voltage is used for controlling the isolation control module, no loop exists on the inner side and the outer side of the contactor, and the phenomenon of circuit burnout is effectively avoided; the acquisition is directly carried out by depending on hardware, software control is not needed, the misjudgment condition caused by software reasons can be effectively avoided, the accuracy of the state judgment of the contactor is improved, and the loads of a processor and an acquisition chip are reduced; an isolation acquisition chip and an isolation power supply are not required to be additionally arranged, and the voltage outside the contactor is directly obtained through high-voltage division and is used for determining the state of the contactor.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic diagram of an exemplary connection of a current electric vehicle high voltage power supply;
FIG. 2 is a schematic diagram of a contactor status determination device provided in accordance with one embodiment of the present disclosure;
fig. 3 is a schematic diagram of a contactor status determination device provided in accordance with another embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
With the rapid development of the electric automobile industry, the safety performance of the electric automobile becomes more and more important. Contactors (such as a main positive contactor of a battery pack, a main negative contactor of the battery pack, a pre-charging contactor of the battery pack and the like) are key components in an electric transmission system of an electric vehicle, and adhesion faults may occur during the closing and opening processes of the contactors, so that the safety of the control of the whole vehicle is affected, and the safety of personnel on the vehicle and personnel around the vehicle is easily threatened. Therefore, the accurate judgment of the state of the contactor plays an important role in ensuring the safety of the whole vehicle.
The high-voltage battery pack is a main power output source of the electric automobile, the total voltage of the high-voltage battery pack is generally higher, and the sealing grade of the battery pack is higher, so that a vehicle operator can conveniently know whether a power output loop of the battery pack is normal or not in real time, a high-voltage acquisition circuit is usually connected into the power output loop, the voltage values of all acquisition points among all contactors are acquired, the acquired voltage values are compared, and then the state of the contactor is determined to judge whether the contactor breaks down or not.
If voltage acquisition is required, a reference ground is determined, and the acquired voltages are all voltages relative to the reference ground. At present, only one reference ground is arranged on most electric vehicles, and the reference ground is the total negative of the battery PACK (namely, the inner side of the total negative contactor of the battery PACK, PACK-). The voltage acquisition of each acquisition point is carried out on the basis of the total negative potential point of the battery pack as a zero potential point. This approach is strictly limited by the contactor closing sequence, which, if changed, risks the circuit board burning out.
In the battery PACK, taking the battery PACK total negative contactor as an example, there are a total negative contactor inside (PACK-) and a total negative contactor outside (LINK-). The inner side of the total negative contactor is the total negative of the battery pack, and the battery pack is always electrified. The outer side of the total negative contactor is not electrified when the total negative contactor is disconnected (not connected with the total negative of the battery pack), and is electrified when the total negative contactor is closed (connected with the total negative of the battery pack).
Fig. 1 is an exemplary connection diagram of a high voltage electric vehicle. As shown in fig. 1, S1 is a precharge contactor, S2 is a main positive contactor, S3 is a main negative contactor, R is a precharge resistor, and U01, U1, U02, U2, U4, and U5 are high-voltage collecting points, respectively. The effect of each collection point was:
the voltage of the battery pack can be obtained by collecting the voltage between the U01 and the U1;
the state of the main contactor and the negative contactor can be judged by collecting the voltage between the U1 and the U02;
the state of the main positive contactor can be judged by collecting the voltage between U2 and U01;
the pre-charged contactor state can be judged by collecting the voltage between U5 and U01.
As described above, in the prior art, voltage acquisition and contactor state judgment are generally realized by a high voltage acquisition circuit. The high-voltage acquisition circuit is composed of a voltage division module, a filtering processing circuit, an analog-to-digital conversion circuit (A/D conversion circuit), an isolation communication circuit and a processor. In the collection process, after the high voltage of the battery pack enters the high-voltage collection circuit, the high voltage is firstly divided by the divider resistor, then the voltage measured on the sampling resistor is processed by the filter processing circuit, and then the voltage is transmitted to the processor through the A/D conversion circuit and the isolation communication circuit, so that the voltage collection is completed. As can be seen from fig. 1, if the voltage difference is to be compared accurately, the voltage between the collection points needs to be measured accurately and then a/D converted, so that the processor can perform comparison and judgment. The acquisition circuit in the prior art has the following problems:
(1) the state of the main and negative contactors can be judged only when being electrified, and the real-time performance is insufficient;
(2) the sequence of closing and opening each contactor has strict limitation, and the contactors need to be operated for many times, so that the period is long;
(3) if some contactors are in an adhesion state, closing the main positive contactor seriously threatens the safety of the whole vehicle and personnel on the vehicle. For example, if the entire vehicle adjusts the contactor closing sequence according to the requirement, i.e., the contactor closing sequence is first closed S1 and then closed S3, the contactor closing sequence is closed S2 after the precharge is completed, and then the contactor opening sequence is opened S1. At this moment, a very serious problem exists, because in a vehicle environment, after S1 is closed firstly, the high voltage of the battery pack can be directly transmitted to the U02 through the vehicle environment, at this moment, the voltages of U02 and U01 are the battery pack voltage, but because an acquisition circuit exists between U1 and U02, and between U2 and U02, the high voltage passes through the acquisition circuit to form a loop with U01, the impedance in the loop is small, so the current is very large, and components in the circuit are easy to burn.
In order to solve the above problems, the present disclosure provides a contactor state determination device and a vehicle, so as to improve real-time performance, safety and accuracy of battery pack contactor state determination.
Fig. 2 is a schematic diagram of a contactor status determination device provided according to one embodiment of the present disclosure. As shown in fig. 2, the contactor state determination device 20 includes: the voltage divider module 21, the acquisition module 22, the isolation control module 23, the low-voltage power supply module 24 and the processor 25, wherein electrical isolation exists inside the isolation control module 23, and the low-voltage power supply module 24 is used for providing a low-voltage power supply to the outside.
One end of the voltage dividing module 21 is connected with a first acquisition point C1, and the other end of the voltage dividing module 21 is connected with a first acquisition end P1 of the acquisition module 22; the second collection end P2 of the collection module 22 is connected to the second collection point C3; a first input end Pt1 of the isolation control module 23 is connected with a first acquisition end P1 of the acquisition module 22, a second input end Pt2 of the isolation control module 23 is connected with a second acquisition point C3, a first output end Pt3 of the isolation control module 23 is connected with the low-voltage power supply module 24 and the processor 25, a second output end Pt4 of the isolation control module 23 is grounded, and the isolation control module 23 is used for acquiring the voltage of the acquisition module 22 through a first input end Pt1 and a second input end Pt2 and outputting the voltage through a first output end Pt3 and a second output end Pt 4; the processor 25 is used for determining the opening and closing state of the target contactor K3 according to the level of the collected electric signal from the first output terminal Pt3 of the isolation control module 23.
First, fig. 2 is briefly described, and as shown in fig. 2, the contactor state determination device provided by the present disclosure is connected when the target contactor K3 is the main negative contactor. The first collection point C1 is located at the high-voltage positive side of the battery pack, and is equivalent to the collection point U1 in fig. 1, C2 is the outer side of the main positive contactor of the battery pack, and is equivalent to the collection point U2 in fig. 1, C0 is the high-voltage negative side of the battery pack, and is equivalent to the collection point U01 in fig. 1, and C3 is located at the outer side of the main negative contactor.
The first collection point C1 is located at one of the two poles of the battery pack far away from the target contactor K3 to be determined, and the second collection point C3 is located outside the target contactor K3. For example, if the target contactor is the main negative contactor of the battery pack, the first collection point C1 is located at the positive pole of the battery pack (the main positive pole of the battery pack), and the second collection point C3 is located outside the main negative contactor. For another example, if the target contactor is the main positive contactor of a battery pack, the first collection point C1 is located at the negative pole of the battery pack (the main negative pole of the battery pack) and the second collection point C3 is located outside the main positive contactor. The contactor state determining device can determine the state of the target contactor through the formed acquisition loop.
In a possible embodiment, the voltage dividing module 21 may be composed of at least one first resistor, and the respective first resistors of the voltage dividing module 21 are connected in series. Here, the first resistor is a voltage dividing resistor. The first resistors may be identical to each other, or the first resistors may not be identical to each other. For example, as shown in fig. 3, the voltage dividing module 21 may be formed of voltage dividing resistors R1 to R5. Through setting up the partial pressure module, can increase the impedance of gathering the return circuit in order to reduce the electric current, prevent that return circuit current from too big causing the circuit to burn out, promote the security.
In one possible embodiment, the acquisition module 22 may be a third resistor having a high withstand voltage value. When the third resistor is selected, the third resistor may be selected from resistors having a withstand voltage value higher than the total voltage of the battery pack. For example, as shown in fig. 3, the acquisition module 22 may employ a high-precision sampling resistor R6. The isolation control module 23 implements isolation control by the acquired voltage across the acquisition module 22.
Since the circuit area of the battery pack is a high-voltage area and the area of the processor 25 is a low-voltage area, circuit isolation needs to be performed through the isolation control module 23, and the isolation control module 23 can be a device with an isolation control function.
In one possible embodiment, the isolation control module 23 may be an opto-coupler. An Optical Coupler (OC), also called a photo isolator, abbreviated as an optocoupler, is an "electro-optic-electrical" converter that transmits electrical signals using light as a medium. The photoelectric coupler uses light as medium to transmit electric signal, and has good isolation action for input and output electric signals, and it is formed from two portions of luminous source and light-receiving device. The light source and the light receiver are assembled in the same closed shell and are isolated from each other by a transparent insulator. The pin of the light emitting source is an input end, and the pin of the light receiver is an output end. The common light emitting source is a light emitting diode, and the light receiving device is a photodiode, a phototriode, or the like.
If the isolation control module 23 is a photocoupler, correspondingly, the isolation control module 23 includes a light emitting source and a light receiving device. As shown in fig. 3, the anode of the light emitting source can be used as the first input terminal Pt1 of the isolation control module 23, the cathode of the light emitting source can be used as the second input terminal Pt2 of the isolation control module 23, and the two paths of the light receiver can be used as the first output terminal Pt3 and the second output terminal Pt4 of the isolation control module 23, respectively.
By adopting the mode, the photoelectric coupler is used as an isolation control module, and the advantages of small volume, close coupling, small driving power, high action speed, wide working temperature range and the like of the photoelectric coupler are utilized, so that a high-voltage area where a battery pack is located and a low-voltage area where a processor is located can be isolated, and an electric signal acquired from the high-voltage area is accurately transmitted to the low-voltage area.
In other possible embodiments, other devices with an isolation control function may also be used as the isolation control module, for example, a transformer isolation coupling control device, a capacitive coupling isolation control device, and the like, and the connection mode is similar to that of a photocoupler, which is not described herein again.
In one possible embodiment, the low voltage power module 24 may include a low voltage power source and a second resistor. And, the low voltage power may be connected to the first output terminal Pt3 of the isolation control module 23 through a second resistor. For example, as shown in fig. 3, the low voltage power module 24 may include a low voltage power supply VAUX and a second resistor R8, the VAUX may be selected from a low voltage 5V power supply, and the second resistor R8 may be selected from a pull-up resistor.
The processor 25 performs a processing analysis based on the received electrical signal to determine the target disabler state. In a possible embodiment, the processor 25 may be an MCU (Micro Controller Unit), and the processor 25 may determine the opening and closing states of the target contactor K3 according to the level of the collected electrical signal from the first output terminal Pt3 of the isolation control module 23. The electric signal from the first output terminal Pt3 of the isolation control module 23 can reflect the voltage across the acquisition module 22, so that the processor 25 can conveniently determine the state of the target contactor K3.
As shown in fig. 3, a connection manner of the contactor state determination device provided by the present disclosure is shown when a main negative contactor is a target contactor. The state of the target contactor K3 is determined by the voltage control isolation control module 23 across the third resistor R6 in the circuit. The judgment logic is as follows:
before the target contactor K3 is closed, a loop cannot be formed between the acquisition points C1-C3-C0, so that no voltage difference exists between the two ends of the third resistor R6, the isolation control module 23 is disconnected, and at the moment, the processor 25 can acquire a high-level signal of 5V under the action of the low-voltage power supply VAUX;
when the target contactor K3 is closed, a loop is formed between the collection points C1-C3-C0, so that a voltage difference exists between the two ends of the third resistor R6, the isolation control module 23 is closed, and at this time, the voltage of the low-voltage power supply VAUX is introduced into the ground, and the processor 25 can collect a low-level signal.
Based on the above logic, the state of the target contactor K3 may be determined by the level of the electrical signal received by the processor 25. Thus, the processor 25 may be configured to:
if the collected electric signal from the first output end Pt3 of the isolation control module 23 is a high-level signal, determining that the target contactor K3 is disconnected;
and if the collected electric signal from the first output terminal Pt3 of the isolation control module 23 is a low-level signal, determining that the target contactor K3 is closed.
In another possible embodiment, the logic may be further referred to determine whether the target contactor is not normally opened, not normally closed, etc. in real time by determining the states of the target contactor before the high voltage on the vehicle, during the high voltage, after the low voltage. The high voltage contactor state determination may be divided into an upper high voltage pre-determination, an upper high voltage in-process determination, and a lower high voltage post-determination.
When the states of the target contactor K3 before the upper high voltage and after the lower high voltage are determined, the target contactor K3 should be normally in an open state. In this example, processor 25 may be configured to:
before the vehicle is subjected to high voltage, if the collected electric signal from the first output end Pt3 of the isolation control module 23 is a low-level signal, outputting first alarm information, wherein the first alarm information is used for prompting that the target contactor K3 has adhesion fault; and/or the presence of a gas in the gas,
after the vehicle is driven to have high voltage, if the collected electric signal from the first output end Pt3 of the isolation control module 23 is a low-level signal, second alarm information is output and used for prompting the target contactor K3 to have adhesion fault.
In the above example, the logic for determining the state of the target contactor K3 before high voltage on the vehicle is as follows:
if the processor 25 acquires a high level signal, the target contactor K3 is determined to be in an off state, which indicates that the target contactor K3 is normal, and a high voltage instruction can be executed;
if the low level signal is collected by the processor 25, it is determined that the target contactor K3 is in a closed state, which indicates that the target contactor K3 is not normally opened and is stuck.
If the target contactor is determined to be adhered, first alarm information can be output, the adhesion fault of the target contactor is reported, and high voltage on the vehicle is not allowed.
In the above example, after the vehicle is under high voltage, the logic for determining the state of the target contactor K3 is as follows:
if the processor 25 acquires a high level signal, determining that the target contactor K3 is in an open state, and indicating that the target contactor K3 is normal;
if the processor 25 collects a low level signal, it is determined that the target contactor K3 is in a closed state, which indicates that the target contactor K3 is not normally opened and is stuck.
If confirm that the target contactor adhesion appears, can export second alarm information, report that the target contactor has the adhesion trouble to relevant personnel know.
In the process of high voltage, two situations can be distinguished according to different power-on sequences. If the target contactor K3 is taken as the main negative contactor, the determination logic may be as follows.
In the first case, the main negative contactor is closed first, and the pre-charge contactor and the main positive contactor are closed after the main negative contactor is closed. When the main negative contactor is closed, if the low level signal acquired by the processor 25 determines that the main negative contactor is in a closed state, it indicates that the main negative contactor is normally closed according to the command, and therefore, the command for closing the pre-charging contactor and the main positive contactor can be continuously executed. If the main and negative contactors are determined to be in the open state through the high-level signal acquired by the processor 25, it is indicated that the main and negative contactors are not closed according to the instruction, at this time, third alarm information can be output to report a closing fault of the main and negative contactors, and other power-on commands are not executed continuously.
In the second case, the pre-charged contactor is closed first, after the pre-charged contactor is normally closed, the command to close the main negative contactor is issued again, and after the main negative contactor is normally closed, the command to close the main positive contactor is issued again. When the main negative contactor is closed, if the low level signal acquired by the processor 25 determines that the main negative contactor is in a closed state, the main negative contactor is normally closed according to the instruction, and therefore, the instruction for closing the main positive contactor can be continuously executed. If the main and negative contactors are determined to be in the open state through the high-level signal acquired by the processor 25, it is indicated that the main and negative contactors are not closed according to the instruction, at this time, third alarm information can be output to report a closing fault of the main and negative contactors, and other power-on commands are not executed continuously.
In one possible embodiment, the first input Pt1 of the isolation control module 23 may be connected to the first acquisition end P1 of the acquisition module 22 through a first current limiting module for reducing the current flowing through the isolation control module 23. When the first current limiting module is provided, the current reaching the isolation control module 23 after passing through the first current limiting module should be higher than the lowest operating current of the isolation control module 23. The first current limiting module may be formed of at least one resistor connected in series. For example, as shown in fig. 3, the first current limiting module may be a resistor R7 as a high voltage region current limiting resistor. Through setting up first current-limiting module, can increase the impedance of gathering the return circuit in order to reduce the electric current, especially the electric current of keeping apart control module of flowing through prevents that return circuit electric current is too big to cause the circuit to burn out, promotes the security.
In one possible embodiment, the first output Pt3 of the isolation control module 23 is connected to the processor 25 through a second current limiting module for reducing the current flowing into the processor 25. The second current limiting module may be formed of at least one resistor connected in series. For example, as shown in fig. 3, the second current limiting module may be a resistor R9 as a low voltage region current limiting resistor. Through setting up second current-limiting module, can increase the impedance of gathering the return circuit in order to reduce the electric current, especially the electric current that flows through the treater prevents that the return circuit electric current is too big to cause the circuit to burn out, promotes the security.
The target contactor according to the present disclosure may be any contactor of the battery pack, and if it is necessary to determine the states of the plurality of contactors of the battery pack, each of the contactors may be set as the target contactor, and the contactor state determination device provided in the present disclosure may be provided for each of the target contactors. Thus, from this point of view, the contactor state provided by the present disclosure has a high degree of flexibility.
Through the contactor state determination device that this disclosure provided, can bring following beneficial effect: the state of the contactor can be determined in real time, and the problem that the state of the contactor can be determined only when the contactor is electrified is solved; the collected voltage is used for controlling the isolation control module, no loop exists on the inner side and the outer side of the contactor, and the phenomenon of circuit burnout is effectively avoided; the acquisition is directly carried out by depending on hardware, software control is not needed, the misjudgment condition caused by software reasons can be effectively avoided, the accuracy of the state judgment of the contactor is improved, and the loads of a processor and an acquisition chip are reduced; an isolation acquisition chip and an isolation power supply are not required to be additionally arranged, and the voltage outside the contactor is directly obtained through high-voltage division and is used for determining the state of the contactor.
The present disclosure also provides a vehicle including a contactor state determination apparatus provided in any of the embodiments of the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A contactor state determination device, comprising: the system comprises a voltage division module, an acquisition module, an isolation control module, a low-voltage power supply module and a processor, wherein electrical isolation exists in the isolation control module, and the low-voltage power supply module is used for providing a low-voltage power supply to the outside;
one end of the voltage division module is connected with a first acquisition point, the other end of the voltage division module is connected with a first acquisition end of the acquisition module, and the first acquisition point is positioned in the two poles of the battery pack and is far away from one pole of a target contactor in a state to be determined;
a second acquisition end of the acquisition module is connected with a second acquisition point, and the second acquisition point is positioned outside the target contactor;
the first input end of the isolation control module is connected with the first acquisition end of the acquisition module, the second input end of the isolation control module is connected with the second acquisition point, the first output end of the isolation control module is connected with the low-voltage power supply module and the processor, the second output end of the isolation control module is grounded, and the isolation control module is used for acquiring the voltage of the acquisition module through the first input end and the second input end and outputting the voltage through the first output end and the second output end;
the processor is used for determining the opening and closing state of the target contactor according to the level of the collected electric signal from the first output end of the isolation control module.
2. The contactor state determining apparatus according to claim 1, wherein the isolation control module is a photocoupler, the isolation control module includes a light emitting source and a light receiving device, an anode of the light emitting source is a first input end of the isolation control module, a cathode of the light emitting source is a second input end of the isolation control module, and two paths of the light receiving device are respectively a first output end and a second output end of the isolation control module.
3. The contactor state determination device according to claim 1, wherein the voltage division module is composed of at least one first resistor, and each first resistor of the voltage division module is connected in series.
4. The contactor status determination device according to claim 1, wherein the first input terminal of the isolation control module is connected to the first collection terminal of the collection module via a first current limiting module, the first current limiting module configured to reduce the current flowing through the isolation control module.
5. The contactor status determination device according to claim 1, wherein the first output of the isolation control module is coupled to the processor through a second current limiting module configured to reduce current flowing into the processor.
6. The contactor status determination device according to claim 1, wherein the low voltage power supply module comprises a low voltage power supply and a second resistor, the low voltage power supply being connected to the first output terminal of the isolation control module through the second resistor.
7. The contactor state determination device according to claim 1, wherein the collection module is a third resistor having a high withstand voltage value.
8. The contactor status determination device of claim 1, wherein the processor is configured to:
if the collected electric signal from the first output end of the isolation control module is a high-level signal, determining that the target contactor is disconnected;
and if the collected electric signal from the first output end of the isolation control module is a low-level signal, determining that the target contactor is closed.
9. The contactor status determination device of claim 1, wherein the processor is configured to:
before a vehicle is subjected to high voltage, if the collected electric signal from the first output end of the isolation control module is a low-level signal, outputting first alarm information, wherein the first alarm information is used for prompting that the target contactor has adhesion fault; and/or the presence of a gas in the gas,
after the vehicle is subjected to high voltage, if the collected electric signal from the first output end of the isolation control module is a low-level signal, second alarm information is output and used for prompting the target contactor to generate adhesion faults.
10. A vehicle characterized by comprising the contactor state determination device according to any one of claims 1 to 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866645A (en) * | 2021-09-07 | 2021-12-31 | 上海德朗能电子科技有限公司 | Rechargeable battery, fault detection method and device of contactor, and storage medium |
| CN115629308A (en) * | 2022-11-17 | 2023-01-20 | 北京睿行智控科技有限公司 | Diagnosis circuit, diagnosis method and system for working state of power battery pack contactor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866645A (en) * | 2021-09-07 | 2021-12-31 | 上海德朗能电子科技有限公司 | Rechargeable battery, fault detection method and device of contactor, and storage medium |
| CN115629308A (en) * | 2022-11-17 | 2023-01-20 | 北京睿行智控科技有限公司 | Diagnosis circuit, diagnosis method and system for working state of power battery pack contactor |
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