CN216285582U - Fault detection device for charge/discharge circuit, charging device, and vehicle - Google Patents
Fault detection device for charge/discharge circuit, charging device, and vehicle Download PDFInfo
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- CN216285582U CN216285582U CN202122403056.XU CN202122403056U CN216285582U CN 216285582 U CN216285582 U CN 216285582U CN 202122403056 U CN202122403056 U CN 202122403056U CN 216285582 U CN216285582 U CN 216285582U
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Abstract
The application provides charge and discharge circuit's fault detection device, charging device and vehicle, this fault detection device includes: the voltage acquisition circuit comprises at least two switches, a voltage division circuit and a voltage acquisition chip, the at least two switches comprise a first switch and a second switch, the voltage division circuit comprises at least two voltage division resistors which are connected in series, the first end of the first switch is electrically connected with the positive electrode of a battery, the first end of the second switch is electrically connected with the second end of a main positive contactor, the second end of the first switch and the second end of the second switch are electrically connected with the first end of the voltage division circuit, the second end of the voltage division circuit is electrically connected with the negative electrode of the battery, and the voltage acquisition chip is used for detecting the voltage at two ends of any at least one voltage division resistor. The fault detection device solves the problem that a fault detection circuit in the prior art occupies a large space.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a fault detection device of a charge and discharge circuit, a charging device and a vehicle.
Background
With the rapid development of the electric automobile industry, the market has higher and higher requirements on the safety performance of electric automobiles. New energy vehicle technology is rapidly developing due to its advantages of low pollution and low energy consumption. The contactor is a key component in a new energy vehicle electric transmission system, and the contactor can have adhesion faults when being connected and disconnected, so that the whole vehicle control system is disordered and the personal safety is seriously threatened.
No matter plug-in hybrid electric vehicle or pure electric vehicle, the high-voltage battery pack is the main power output source, the total voltage is generally higher, and the battery pack is a relatively high-sealing-grade environment, so that a vehicle operator can conveniently know whether a power output circuit of the battery pack is normal or not in real time, the voltage values of all collecting points between contactors in the circuit from a high-voltage output anode to a high-voltage cathode are collected, and then the collected voltage values are compared, so that whether the contactors or the insurance break down or not is judged.
The high-voltage acquisition diagnosis circuit is used for acquiring voltage of each acquisition point in real time, judging a fault source by comparing the acquired voltage values and reporting and processing the fault in time, so that the circuit has great significance for ensuring the safety of vehicles and drivers.
The high-voltage direct current voltage acquisition circuit is required to acquire high-voltage direct current voltage in many systems, but most of the existing high-voltage direct current voltage acquisition circuits have the problems of low reliability and precision or high cost and large occupied processor resources. When voltage acquisition is required, firstly, a reference ground is determined, after all, the acquired voltage is relative to the reference ground, and the high-voltage acquisition diagnostic circuit can be divided into two types according to the difference of the number of the reference grounds.
The first type: only one reference ground, i.e. the total negative of the battery PACK, is inside the main negative contactor (PACK-). The voltage acquisition of each point is based on the point that the total negative potential of the battery pack is zero. Such circuits are limited by the sequence in which the contactors close, if the sequence changes, there is a risk of the circuit board burning out.
The second type: there are two reference grounds, the main negative contactor inboard (PACK-) and outboard (LINK-). The scheme has high cost, occupies more resources of a single chip microcomputer, occupies large space on a PCB (printed circuit board), and has the problem of adhesion of a misinformation contactor.
Currently, most of electric vehicles adopt a first-class method for collection and diagnosis, as shown in fig. 1, S1 is a pre-charging contactor, S2 is a main positive contactor, S3 is a main negative contactor, R is a pre-charging resistor, QF is a circuit breaker, and U01, U1, U02, U2, U4 and U5 are high-voltage collection points respectively. 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 main positive/pre-charged contactor state can be judged by collecting the voltage between U2/U5 and U01; the state of the fuse can be judged by collecting the voltage between U4 and U01, the terminals 1 and 3 are connected with an engine, and the terminals 2 and 4 are connected with a load such as a motor. In the voltage acquisition process, firstly, the high voltage of the battery pack enters the acquisition circuit and then is divided by the divider resistor, then the voltage measured on the sampling resistor is processed by the filter circuit and is transmitted to the MCU processor through the A/D conversion circuit and the isolation communication circuit, and the voltage acquisition is completed.
Specifically, as shown in fig. 2, the voltage acquisition circuit includes a voltage division module, a control module and an acquisition module, the voltage division module is configured to divide voltages at two ends of the voltage acquisition circuit, the control module is configured to control on/off of the voltage acquisition circuit, the acquisition module is configured to acquire a voltage signal to determine voltages at two ends of the voltage acquisition circuit, the multiple voltage acquisition circuits respectively acquire a voltage between U1 and U00, a voltage between U2 and U00, a voltage between U3 and U00, a voltage between U4 and U00, and a voltage between U5 and U00, so as to determine whether the main positive contact, the fuse 1, the fuse 2 and the fuse 3 are faulty or not, when the number of the high voltage acquisition circuits reaches a certain number, the number of a/D conversion channels is not enough, an analog-to-digital conversion chip needs to be added to increase the a/D conversion channels, if the analog-to-digital conversion chip has only 5 channels, can satisfy current 5 highly compressed gathers, in case the high pressure is gathered and is surpassed 5 ways and will appear gathering the problem that the passageway resource is not enough, need guarantee each high voltage acquisition circuit's creepage interval when the device overall arrangement on the PCB circuit board, a plurality of voltage acquisition circuit need occupy a large amount of spaces on the circuit board and go to realize the purpose of high pressure collection, with the trend conflict that requires BMS circuit board miniaturization in the present trade.
SUMMERY OF THE UTILITY MODEL
The main aim at of this application provides a fault detection device, charging device and vehicle of charge-discharge circuit to solve the big problem of fault detection circuit occupation space among the prior art.
In order to achieve the above object, according to one aspect of the present application, there is provided a fault detection device for a charge and discharge circuit, the charge and discharge circuit including a battery, a main positive contactor, a main negative contactor, and a charging power supply, a positive electrode of the battery being electrically connected to a first end of the main positive contactor, a second end of the main positive contactor being electrically connected to a positive electrode of the charging power supply, a negative electrode of the battery being electrically connected to a first end of the main negative contactor, a second end of the main negative contactor being electrically connected to a positive electrode of the charging power supply, the device including: the voltage acquisition circuit comprises at least two switches, a voltage division circuit and a voltage acquisition chip, wherein the switches comprise a first switch and a second switch, the voltage division circuit comprises at least two voltage division resistors which are connected in series, the first end of the first switch is electrically connected with the positive pole of the battery, the first end of the second switch is electrically connected with the second end of the main positive contactor, the second end of the first switch is electrically connected with the second end of the second switch, the first end of the second switch is electrically connected with the first end of the voltage division circuit, the second end of the voltage division circuit is electrically connected with the negative pole of the battery, and the voltage acquisition chip is used for detecting at least one of the voltages at the two ends of the voltage division resistors.
Optionally, the charge and discharge circuit further includes at least one circuit breaker, a first end of the circuit breaker is electrically connected to a second end of the main positive contactor, a second end of the circuit breaker is connected to a load, the circuit breaker corresponds to the load one to one, and the voltage acquisition circuit further includes: and the first end of the third switch is electrically connected with the second end of the circuit breaker, and the second end of the third switch is electrically connected with the first end of the voltage division circuit.
Optionally, the charging and discharging circuit further includes a pre-charging circuit, the pre-charging circuit includes a pre-charging contactor and a pre-charging resistor connected in series, the pre-charging circuit is connected in parallel with the main positive contactor, and the voltage collecting circuit further includes: and a first end of the fourth switch is electrically connected with a pre-charging node, a second end of the fourth switch is electrically connected with a first end of the voltage division circuit, and the pre-charging node is a node of the pre-charging contactor and the pre-charging resistor.
Optionally, the apparatus further includes a processor, the switch is an optical coupling control switch, and the processor is configured to control the switch to be turned on or turned off.
Optionally, the voltage acquisition chip includes a filter circuit and an analog-to-digital converter, the filter circuit is configured to filter the voltage signal acquired by the voltage acquisition chip to obtain a filtered signal, the analog-to-digital converter is in communication connection with the filter circuit, and the analog-to-digital converter is configured to convert the filtered signal into a digital signal.
Optionally, the device further includes an isolation signal chip and a processor, the isolation signal chip is in communication connection with the voltage acquisition chip and the processor respectively, and the isolation signal chip is configured to send the digital signal corresponding to the voltage signal acquired by the voltage acquisition chip to the processor.
According to another aspect of the application, a charging device is provided, including charge and discharge circuit and charge and discharge circuit's fault detection device, charge and discharge circuit includes battery, main positive contactor, main negative contactor and charging source, the positive pole of battery with the first end electricity of main positive contactor is connected, the second end of main positive contactor with charging source's positive electricity is connected, the negative pole of battery with the first end electricity of main negative contactor is connected, the second end of main negative contactor with charging source's positive electricity is connected, charge and discharge circuit's fault detection device be arbitrary one the device.
According to still another aspect of the present application, there is provided a vehicle including the charging device.
By applying the technical scheme of the application, in the fault detection device of the charge and discharge circuit, the charge and discharge circuit comprises a battery, a main positive contactor, a main negative contactor and a charging power supply, wherein the positive electrode of the battery is electrically connected with the first end of the main positive contactor, the second end of the main positive contactor is electrically connected with the positive electrode of the charging power supply, the negative electrode of the battery is electrically connected with the first end of the main negative contactor, the second end of the main negative contactor is electrically connected with the positive electrode of the charging power supply, the device comprises a voltage acquisition circuit, at least two switches, at least one voltage division circuit and a voltage acquisition chip, wherein the at least two switches comprise a first switch and a second switch, the voltage division circuit comprises at least two voltage division resistors which are electrically connected in series, the first end of the first switch is electrically connected with the positive electrode of the battery, and the first end of the second switch is electrically connected with the second end of the main positive contactor, the second end of the first switch and the second end of the second switch are both electrically connected with the first end of the voltage division circuit, the second end of the voltage division circuit is electrically connected with the negative electrode of the battery, and the voltage acquisition chip is used for detecting the voltage at two ends of any one or more voltage division resistors. The device can detect the voltage at two ends of a battery through a bleeder circuit, a voltage acquisition chip and a first switch to obtain a first voltage, can detect the voltage between the second end of the main positive contactor and the cathode of the battery through the same bleeder circuit, the voltage acquisition chip and a second switch to obtain a second voltage, under the condition that the main positive contactor is closed, the first voltage is not 0, the second voltage is 0, the main positive contactor fails, the first voltage is 0, the second voltage is 0, the battery fails, the first voltage and the second voltage are not 0, the main positive contactor and the battery are normal, compared with the prior art that at least two bleeder circuits and at least two voltage acquisition chips are respectively connected with corresponding switches to acquire the first voltage and the second voltage, the bleeder circuit and the voltage acquisition chips are shared, thereby the creepage distance limitation is not required to be considered, the occupied space of the fault detection device is reduced, and the problem that the occupied space of the fault detection circuit is large in the prior art is solved. In addition, a plurality of paths of voltage dividing resistors and voltage acquisition chips are not required to be designed, and a large amount of component cost can be saved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 shows a schematic diagram of a prior art charge and discharge circuit;
FIG. 2 shows a schematic diagram of a prior art fault detection device for a charge and discharge circuit
Fig. 3 shows a schematic diagram of a fault detection arrangement of a charge and discharge circuit according to an embodiment of the present application.
Wherein the figures include the following reference numerals:
01. a battery; 02. a primary positive contactor; 03. a main negative contactor; 04. a circuit breaker; 05. pre-charging a contactor; 10. a switch; 11. a first switch; 12. a second switch; 13. a third switch; 20. a voltage dividing circuit; 30. a voltage acquisition chip; 40. isolating the signal chip; 50. a processor.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As described in the background art, the fault detection circuit in the prior art occupies a large space, and in order to solve the above problem, the present application provides a fault detection device for a charge and discharge circuit, a charging device, and a vehicle.
According to an embodiment of the present application, there is provided a fault detection device of a charge and discharge circuit, as shown in fig. 3, the charge and discharge circuit including a battery 01, a main positive contactor 02, a main negative contactor 03, and a charging power supply, a positive electrode of the battery being electrically connected to a first end of the main positive contactor, a second end of the main positive contactor being electrically connected to a positive electrode of the charging power supply, a negative electrode of the battery being electrically connected to a first end of the main negative contactor, and a second end of the main negative contactor being electrically connected to a positive electrode of the charging power supply, the device including:
the voltage acquisition circuit comprises at least two switches 10, a voltage division circuit 20 and a voltage acquisition chip 30, wherein the at least two switches comprise a first switch 11 and a second switch 12, the voltage division circuit comprises at least two voltage division resistors 21 connected in series, a first end of the first switch 11 is electrically connected with a positive electrode of the battery 01, a first end of the second switch 12 is electrically connected with a second end of the main positive contactor 02, both a second end of the first switch 11 and a second end of the second switch 12 are electrically connected with a first end of the voltage division circuit 20, a second end of the voltage division circuit 20 is electrically connected with a negative electrode of the battery 01, and the voltage acquisition chip 30 is used for detecting voltages at two ends of any at least one voltage division resistor 21.
In the fault detection device of the charge and discharge circuit, the charge and discharge circuit comprises a battery, a main positive contactor, a main negative contactor and a charging power supply, wherein the positive pole of the battery is electrically connected with the first end of the main positive contactor, the second end of the main positive contactor is electrically connected with the positive pole of the charging power supply, the negative pole of the battery is electrically connected with the first end of the main negative contactor, the second end of the main negative contactor is electrically connected with the positive pole of the charging power supply, the device comprises a voltage acquisition circuit which comprises at least two switches, a voltage division circuit and a voltage acquisition chip, the at least two switches comprise a first switch and a second switch, the voltage division circuit comprises at least two voltage division resistors which are electrically connected in series, the first end of the first switch is electrically connected with the positive pole of the battery, and the first end of the second switch is electrically connected with the second end of the main positive contactor, the second end of the first switch and the second end of the second switch are both electrically connected with the first end of the voltage division circuit, the second end of the voltage division circuit is electrically connected with the negative electrode of the battery, and the voltage acquisition chip is used for detecting the voltage at two ends of any one or more voltage division resistors. The device can detect the voltage at two ends of a battery through a bleeder circuit, a voltage acquisition chip and a first switch to obtain a first voltage, can detect the voltage between the second end of the main positive contactor and the cathode of the battery through the same bleeder circuit, the voltage acquisition chip and a second switch to obtain a second voltage, under the condition that the main positive contactor is closed, the first voltage is not 0, the second voltage is 0, the main positive contactor fails, the first voltage is 0, the second voltage is 0, the battery fails, the first voltage and the second voltage are not 0, the main positive contactor and the battery are normal, compared with the prior art that at least two bleeder circuits and at least two voltage acquisition chips are respectively connected with corresponding switches to acquire the first voltage and the second voltage, the bleeder circuit and the voltage acquisition chips are shared, thereby the creepage distance limitation is not required to be considered, the occupied space of the fault detection device is reduced, and the problem that the occupied space of the fault detection circuit is large in the prior art is solved. In addition, a plurality of paths of voltage dividing resistors and voltage acquisition chips are not required to be designed, and a large amount of component cost can be saved.
In an embodiment of the present application, as shown in fig. 3, the charge and discharge circuit further includes at least one circuit breaker 04, a first end of the circuit breaker 04 is electrically connected to a second end of the main positive contactor 02, a second end of the circuit breaker 04 is connected to a load, the circuit breakers 04 correspond to the loads one to one, the voltage collecting circuit further includes at least one third switch 13, a first end of the third switch 13 is electrically connected to the second end of the circuit breaker 04, and a second end of the third switch 13 is electrically connected to the first end of the voltage dividing circuit 20. Specifically, the charging and discharging circuit is electrically connected to a load through a breaker, a first end of the third switch is electrically connected to a second end of the breaker, and a second end of the third switch is electrically connected to a first end of the voltage divider circuit, so that the voltage acquisition circuit can acquire a voltage between the second end of the breaker and a negative electrode of the battery, and determine whether the breaker fails according to the voltage, for example, when the voltage is greater than 0, the breaker operates normally, and when the voltage is equal to 0, the breaker is disconnected, and a fault occurs.
In an embodiment of the present application, the charging and discharging circuit further includes a pre-charging circuit, the pre-charging circuit includes a pre-charging contactor 05 and a pre-charging resistor connected in series, the pre-charging circuit is connected in parallel with the main positive contactor, the voltage collecting circuit further includes a fourth switch, a first end of the fourth switch is electrically connected to a pre-charging node, a second end of the fourth switch is electrically connected to a first end of the voltage dividing circuit, and the pre-charging node is a node between the pre-charging contactor and the pre-charging resistor. Specifically, a first end of the fourth switch is electrically connected to the pre-charging node, and a second end of the fourth switch is electrically connected to the first end of the voltage divider circuit, so that the voltage acquisition circuit can acquire the voltage between the pre-charging node and the negative electrode of the battery, and determine whether the pre-charging contactor is faulty according to the voltage, for example, when the main positive contactor is turned off, the pre-charging contactor is turned on, the voltage is greater than 0, the pre-charging contactor normally operates, the voltage is equal to 0, the pre-charging contactor is turned off, and an adhesion fault occurs.
In an embodiment of the present application, the apparatus further includes a processor, the switch is an optical coupling control switch, and the processor is configured to control the switch to be turned on or off. Specifically, the switch is an optical coupling control switch, the optical coupling is controlled by a control end to be resistant to high voltage in two directions, the control port of the processor outputs a high level to the control end of the optical coupling control switch to control the optical coupling control switch to be switched on, and the control port of the processor outputs a low level to the control end of the optical coupling control switch to control the optical coupling control switch to be switched off.
In an embodiment of the application, the voltage acquisition chip includes a filter circuit and an analog-to-digital converter, the filter circuit is configured to filter a voltage signal acquired by the voltage acquisition chip to obtain a filtered signal, the analog-to-digital converter is in communication connection with the filter circuit, and the analog-to-digital converter is configured to convert the filtered signal into a digital signal. Specifically, the filter circuit performs filtering processing on the adopted voltage signal, reduces the influence of noise, obtains a filtered signal, and converts the filtered signal into a digital signal, so that the processor performs data processing to obtain a voltage value.
It should be noted that, in the prior art, as shown in fig. 2, voltage signals acquired by the acquisition modules 1 to 5 are transmitted to the CPU through the acquisition channels of the 5 analog-to-digital converters, the contactors corresponding to the control modules are sequentially turned on/off and switched to the acquisition channels of the corresponding acquisition modules, the fault detection period is long, the voltage acquisition chip can transmit the voltage signals through one acquisition channel of the analog-to-digital converter, and only the switch needs to be controlled to be turned on/off, the acquisition channels do not need to be switched, the fault detection time is reduced, and channel resources are saved.
In an embodiment of the present application, as shown in fig. 3, the apparatus further includes an isolation signal chip 40 and a processor 50, the isolation signal chip 40 is in communication connection with the voltage acquisition chip 30 and the processor 50, respectively, and the isolation signal chip 40 is configured to send the digital signal corresponding to the voltage signal acquired by the voltage acquisition chip to the processor 50. Specifically, after the voltage acquisition signal is filtered and converted, the voltage acquisition signal is transmitted to the processor for processing through SPI isolation communication.
It should be noted that when the voltage between U1 and U00 needs to be collected, the processor controls the switch Q1 port to output a high level, the control ports corresponding to the switch Q2, the switch Q3, the switch Q4, and the switch Q5 output low levels, so that the switch Q1 is turned on, the switches Q2, Q3, Q4, and Q5 are in an off state, the voltage at the U1 point reaches the voltage dividing resistor R1 through the switch Q1, voltage division is performed through the R1-R6, then the voltage collecting chip collects the voltage on the R6 high-precision sampling resistor, and then analog-to-digital conversion is performed to convert the collected analog voltage into digital quantity, and the digital quantity is isolated through the SPI and then transmitted to the processor for processing.
According to an embodiment of the present application, there is provided a charging device including a charging and discharging circuit and a fault detection device of the charging and discharging circuit, wherein the charging and discharging circuit includes a battery, a main positive contactor, a main negative contactor, and a charging power supply, a positive electrode of the battery is electrically connected to a first end of the main positive contactor, a second end of the main positive contactor is electrically connected to a positive electrode of the charging power supply, a negative electrode of the battery is electrically connected to a first end of the main negative contactor, a second end of the main negative contactor is electrically connected to a positive electrode of the charging power supply, and the fault detection device of the charging and discharging circuit is any one of the above devices.
The charging device comprises a charging and discharging circuit and a fault detection device of the charging and discharging circuit, wherein the charging and discharging circuit comprises a battery, a main positive contactor, a main negative contactor and a charging power supply, the positive pole of the battery is electrically connected with the first end of the main positive contactor, the second end of the main positive contactor is electrically connected with the positive pole of the charging power supply, the negative pole of the battery is electrically connected with the first end of the main negative contactor, the second end of the main negative contactor is electrically connected with the positive pole of the charging power supply, the device comprises a voltage acquisition circuit, at least two switches and a voltage acquisition chip, the voltage acquisition circuit comprises at least two voltage division resistors which are electrically connected in series, the first end of the first switch is electrically connected with the positive pole of the battery, and the first end of the second switch is electrically connected with the second end of the main positive contactor, the second end of the first switch and the second end of the second switch are both electrically connected with the first end of the voltage division circuit, the second end of the voltage division circuit is electrically connected with the negative electrode of the battery, and the voltage acquisition chip is used for detecting the voltage at two ends of any one or more voltage division resistors. The device can detect the voltage at two ends of a battery through a bleeder circuit, a voltage acquisition chip and a first switch to obtain a first voltage, can detect the voltage between the second end of the main positive contactor and the cathode of the battery through the same bleeder circuit, the voltage acquisition chip and a second switch to obtain a second voltage, under the condition that the main positive contactor is closed, the first voltage is not 0, the second voltage is 0, the main positive contactor fails, the first voltage is 0, the second voltage is 0, the battery fails, the first voltage and the second voltage are not 0, the main positive contactor and the battery are normal, compared with the prior art that at least two bleeder circuits and at least two voltage acquisition chips are respectively connected with corresponding switches to acquire the first voltage and the second voltage, the bleeder circuit and the voltage acquisition chips are shared, thereby the creepage distance limitation is not required to be considered, the occupied space of the fault detection device is reduced, and the problem that the occupied space of the fault detection circuit is large in the prior art is solved. In addition, a plurality of paths of voltage dividing resistors and voltage acquisition chips are not required to be designed, and a large amount of component cost can be saved.
According to an embodiment of the present application, there is provided a vehicle including the charging device described above.
The vehicle comprises a charging device, the charging device comprises a charging and discharging circuit and a fault detection device of the charging and discharging circuit, the charging and discharging circuit comprises a battery, a main positive contactor, a main negative contactor and a charging power supply, the positive pole of the battery is electrically connected with the first end of the main positive contactor, the second end of the main positive contactor is electrically connected with the positive pole of the charging power supply, the negative pole of the battery is electrically connected with the first end of the main negative contactor, the second end of the main negative contactor is electrically connected with the positive pole of the charging power supply, the device comprises a voltage acquisition circuit, the voltage acquisition circuit comprises at least two switches, a voltage division circuit and a voltage acquisition chip, the at least two switches comprise a first switch and a second switch, the voltage division circuit comprises at least two voltage division resistors which are electrically connected in series, and the first end of the first switch is electrically connected with the positive pole of the battery, the first end of the second switch is electrically connected with the second end of the main positive contactor, the second end of the first switch and the second end of the second switch are both electrically connected with the first end of the voltage division circuit, the second end of the voltage division circuit is electrically connected with the negative electrode of the battery, and the voltage acquisition chip is used for detecting the voltage at two ends of any one or more voltage division resistors. The device can detect the voltage at two ends of a battery through a bleeder circuit, a voltage acquisition chip and a first switch to obtain a first voltage, can detect the voltage between the second end of the main positive contactor and the cathode of the battery through the same bleeder circuit, the voltage acquisition chip and a second switch to obtain a second voltage, under the condition that the main positive contactor is closed, the first voltage is not 0, the second voltage is 0, the main positive contactor fails, the first voltage is 0, the second voltage is 0, the battery fails, the first voltage and the second voltage are not 0, the main positive contactor and the battery are normal, compared with the prior art that at least two bleeder circuits and at least two voltage acquisition chips are respectively connected with corresponding switches to acquire the first voltage and the second voltage, the bleeder circuit and the voltage acquisition chips are shared, thereby the creepage distance limitation is not required to be considered, the occupied space of the fault detection device is reduced, and the problem that the occupied space of the fault detection circuit is large in the prior art is solved. In addition, a plurality of paths of voltage dividing resistors and voltage acquisition chips are not required to be designed, and a large amount of component cost can be saved.
In the vehicle, the charging power source may be an engine, and the load may be a motor.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
1) in the fault detection device of the charge and discharge circuit, the charge and discharge circuit comprises a battery, a main positive contactor, a main negative contactor and a charging power supply, wherein the positive electrode of the battery is electrically connected with the first end of the main positive contactor, the second end of the main positive contactor is electrically connected with the positive electrode of the charging power supply, the negative electrode of the battery is electrically connected with the first end of the main negative contactor, the second end of the main negative contactor is electrically connected with the positive electrode of the charging power supply, the device comprises a voltage acquisition circuit which comprises at least two switches, a voltage division circuit and a voltage acquisition chip, the at least two switches comprise a first switch and a second switch, the voltage division circuit comprises at least two voltage division resistors which are electrically connected in series, the first end of the first switch is electrically connected with the positive electrode of the battery, and the first end of the second switch is electrically connected with the second end of the main positive contactor, the second end of the first switch and the second end of the second switch are both electrically connected with the first end of the voltage division circuit, the second end of the voltage division circuit is electrically connected with the negative electrode of the battery, and the voltage acquisition chip is used for detecting the voltage at two ends of any one or more voltage division resistors. The device can detect the voltage at two ends of a battery through a bleeder circuit, a voltage acquisition chip and a first switch to obtain a first voltage, can detect the voltage between the second end of the main positive contactor and the cathode of the battery through the same bleeder circuit, the voltage acquisition chip and a second switch to obtain a second voltage, under the condition that the main positive contactor is closed, the first voltage is not 0, the second voltage is 0, the main positive contactor fails, the first voltage is 0, the second voltage is 0, the battery fails, the first voltage and the second voltage are not 0, the main positive contactor and the battery are normal, compared with the prior art that at least two bleeder circuits and at least two voltage acquisition chips are respectively connected with corresponding switches to acquire the first voltage and the second voltage, the bleeder circuit and the voltage acquisition chips are shared, thereby the creepage distance limitation is not required to be considered, the occupied space of the fault detection device is reduced, and the problem that the occupied space of the fault detection circuit is large in the prior art is solved. In addition, a plurality of paths of voltage dividing resistors and voltage acquisition chips are not required to be designed, and a large amount of component cost can be saved.
2) The charging device comprises a charging and discharging circuit and a fault detection device of the charging and discharging circuit, wherein the charging and discharging circuit comprises a battery, a main positive contactor, a main negative contactor and a charging power supply, the positive pole of the battery is electrically connected with the first end of the main positive contactor, the second end of the main positive contactor is electrically connected with the positive pole of the charging power supply, the negative pole of the battery is electrically connected with the first end of the main negative contactor, the second end of the main negative contactor is electrically connected with the positive pole of the charging power supply, the device comprises a voltage acquisition circuit, the voltage acquisition circuit comprises at least two switches, a voltage division circuit and a voltage acquisition chip, the at least two switches comprise a first switch and a second switch, the voltage division circuit comprises at least two voltage division resistors which are electrically connected in series, the first end of the first switch is electrically connected with the positive pole of the battery, the first end of the second switch is electrically connected with the second end of the main positive contactor, the second end of the first switch and the second end of the second switch are both electrically connected with the first end of the voltage division circuit, the second end of the voltage division circuit is electrically connected with the negative electrode of the battery, and the voltage acquisition chip is used for detecting the voltage at two ends of any one or more voltage division resistors. The device can detect the voltage at two ends of a battery through a bleeder circuit, a voltage acquisition chip and a first switch to obtain a first voltage, can detect the voltage between the second end of the main positive contactor and the cathode of the battery through the same bleeder circuit, the voltage acquisition chip and a second switch to obtain a second voltage, under the condition that the main positive contactor is closed, the first voltage is not 0, the second voltage is 0, the main positive contactor fails, the first voltage is 0, the second voltage is 0, the battery fails, the first voltage and the second voltage are not 0, the main positive contactor and the battery are normal, compared with the prior art that at least two bleeder circuits and at least two voltage acquisition chips are respectively connected with corresponding switches to acquire the first voltage and the second voltage, the bleeder circuit and the voltage acquisition chips are shared, thereby the creepage distance limitation is not required to be considered, the occupied space of the fault detection device is reduced, and the problem that the occupied space of the fault detection circuit is large in the prior art is solved. In addition, a plurality of paths of voltage dividing resistors and voltage acquisition chips are not required to be designed, and a large amount of component cost can be saved.
3) The vehicle comprises a charging device, the charging device comprises a charging and discharging circuit and a fault detection device of the charging and discharging circuit, the charging and discharging circuit comprises a battery, a main positive contactor, a main negative contactor and a charging power supply, the positive pole of the battery is electrically connected with the first end of the main positive contactor, the second end of the main positive contactor is electrically connected with the positive pole of the charging power supply, the negative pole of the battery is electrically connected with the first end of the main negative contactor, the second end of the main negative contactor is electrically connected with the positive pole of the charging power supply, the device comprises a voltage acquisition circuit, the voltage acquisition circuit comprises at least two switches, a voltage division circuit and a voltage acquisition chip, the at least two switches comprise a first switch and a second switch, the voltage division circuit comprises at least two voltage division resistors which are electrically connected in series, the first end of the first switch is electrically connected with the positive pole of the battery, the first end of the second switch is electrically connected with the second end of the main positive contactor, the second end of the first switch and the second end of the second switch are both electrically connected with the first end of the voltage division circuit, the second end of the voltage division circuit is electrically connected with the negative electrode of the battery, and the voltage acquisition chip is used for detecting the voltage at two ends of any one or more voltage division resistors. The device can detect the voltage at two ends of a battery through a bleeder circuit, a voltage acquisition chip and a first switch to obtain a first voltage, can detect the voltage between the second end of the main positive contactor and the cathode of the battery through the same bleeder circuit, the voltage acquisition chip and a second switch to obtain a second voltage, under the condition that the main positive contactor is closed, the first voltage is not 0, the second voltage is 0, the main positive contactor fails, the first voltage is 0, the second voltage is 0, the battery fails, the first voltage and the second voltage are not 0, the main positive contactor and the battery are normal, compared with the prior art that at least two bleeder circuits and at least two voltage acquisition chips are respectively connected with corresponding switches to acquire the first voltage and the second voltage, the bleeder circuit and the voltage acquisition chips are shared, thereby the creepage distance limitation is not required to be considered, the occupied space of the fault detection device is reduced, and the problem that the occupied space of the fault detection circuit is large in the prior art is solved. In addition, a plurality of paths of voltage dividing resistors and voltage acquisition chips are not required to be designed, and a large amount of component cost can be saved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. The utility model provides a charge-discharge circuit's fault detection device, its characterized in that, the charge-discharge circuit includes battery, main positive contactor, main negative contactor and charging source, the anodal of battery with the first end electricity of main positive contactor is connected, the second end of main positive contactor with charging source's anodal electricity is connected, the negative pole of battery with the first end electricity of main negative contactor is connected, the second end of main negative contactor with charging source's anodal electricity is connected, the device includes:
the voltage acquisition circuit comprises at least two switches, a voltage division circuit and a voltage acquisition chip, wherein the switches comprise a first switch and a second switch, the voltage division circuit comprises at least two voltage division resistors which are connected in series, the first end of the first switch is electrically connected with the positive pole of the battery, the first end of the second switch is electrically connected with the second end of the main positive contactor, the second end of the first switch is electrically connected with the second end of the second switch, the first end of the second switch is electrically connected with the first end of the voltage division circuit, the second end of the voltage division circuit is electrically connected with the negative pole of the battery, and the voltage acquisition chip is used for detecting at least one of the voltages at the two ends of the voltage division resistors.
2. The apparatus of claim 1, wherein the charging and discharging circuit further comprises at least one circuit breaker, a first end of the circuit breaker is electrically connected to a second end of the main positive contactor, a second end of the circuit breaker is connected to a load, the circuit breaker corresponds to the load one by one, and the voltage collecting circuit further comprises:
and the first end of the third switch is electrically connected with the second end of the circuit breaker, and the second end of the third switch is electrically connected with the first end of the voltage division circuit.
3. The apparatus of claim 1, wherein the charge-discharge circuit further comprises a pre-charge circuit comprising a pre-charge contactor and a pre-charge resistor connected in series, the pre-charge circuit being connected in parallel with the primary positive contactor, the voltage acquisition circuit further comprising:
and a first end of the fourth switch is electrically connected with a pre-charging node, a second end of the fourth switch is electrically connected with a first end of the voltage division circuit, and the pre-charging node is a node of the pre-charging contactor and the pre-charging resistor.
4. The device according to any one of claims 1 to 3, further comprising a processor, wherein the switch is an optocoupler control switch, and the processor is configured to control the switch to be turned on or off.
5. The device of claim 1, wherein the voltage acquisition chip comprises a filter circuit and an analog-to-digital converter, the filter circuit is configured to filter the voltage signal acquired by the voltage acquisition chip to obtain a filtered signal, the analog-to-digital converter is communicatively connected to the filter circuit, and the analog-to-digital converter is configured to convert the filtered signal into a digital signal.
6. The device of claim 5, further comprising an isolation signal chip and a processor, wherein the isolation signal chip is in communication connection with the voltage acquisition chip and the processor respectively, and the isolation signal chip is configured to send the digital signal corresponding to the voltage signal acquired by the voltage acquisition chip to the processor.
7. A charging device comprises a charging and discharging circuit and a fault detection device of the charging and discharging circuit, and is characterized in that the charging and discharging circuit comprises a battery, a main positive contactor, a main negative contactor and a charging power supply, the positive pole of the battery is electrically connected with the first end of the main positive contactor, the second end of the main positive contactor is electrically connected with the positive pole of the charging power supply, the negative pole of the battery is electrically connected with the first end of the main negative contactor, the second end of the main negative contactor is electrically connected with the positive pole of the charging power supply, and the fault detection device of the charging and discharging circuit is the device in any one of claims 1 to 6.
8. A vehicle characterized by comprising the charging device according to claim 7.
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| CN202122403056.XU CN216285582U (en) | 2021-09-30 | 2021-09-30 | Fault detection device for charge/discharge circuit, charging device, and vehicle |
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| CN202122403056.XU CN216285582U (en) | 2021-09-30 | 2021-09-30 | Fault detection device for charge/discharge circuit, charging device, and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2021
- 2021-09-30 CN CN202122403056.XU patent/CN216285582U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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