CN114415070A - Monitoring method, monitoring device and processor for connection state of battery high voltage connector - Google Patents

Abstract

The invention provides a monitoring method, a monitoring device and a processor for the connection state of a battery high-voltage connector. The method for monitoring the connection state of the high-voltage connecting part of the battery includes: collecting the voltage difference value of the high-voltage connecting part, wherein the voltage difference value is the difference value of the voltage values at both ends of the high-voltage connecting part; collecting the current value of the high-voltage circuit where the high-voltage connecting part is located; Calculate the impedance value of the high-voltage connection component according to the voltage difference and current value; determine whether the impedance value is greater than the preset impedance threshold, and generate a control instruction when the impedance value is determined to be greater than the preset impedance threshold, wherein the control instruction at least includes the following One: the first warning command, the high-voltage circuit disconnection command; the control command is sent to the target device, and the target device responds to the control command. The technical solution of the present application solves the problem of inaccurate monitoring of the connection state of the battery high-voltage connector in the prior art.

Description

Monitoring method, monitoring device and processor for connection state of battery high voltage connector

technical field

The invention relates to the technical field of power battery state early warning, in particular, to a monitoring method, a monitoring device and a processor for the connection state of a high-voltage connector of a battery.

Background technique

The power battery system of new energy vehicles is composed of multiple cell units, battery modules, and battery packs that are connected in series and parallel; the overall high-voltage circuit is often connected by laser welding, bolt tightening, plug-socket, etc.; these high-voltage connectors In operating conditions, high temperature oxidation, high humidity and high salt corrosion cause the connection and contact resistance to increase, which leads to additional power loss of new energy vehicles and reduced energy utilization of the entire vehicle; Aging, disassembly and installation during maintenance and repair, etc., cause the high-voltage connectors to become loose, loose, broken, or even fall off, resulting in power supply interruption and insulation alarm failure of the vehicle, and even thermal runaway accidents such as smoke and fire in severe cases.

In the prior art, the connection effect verification and connection status monitoring of the high-voltage connectors of the power battery are mostly static conditions before the product is offline or during the maintenance phase (under the condition of no power supply, no charging and discharging operations) For example, the effect of laser welding is often inspected by means of visual comparison, measurement of penetration depth and width, and tensile test; bolt tightening is often inspected by means of torque inspection tooling, visual inspection of locking marking lines; the inspection of plug and socket connectors is mainly It is also a means of visual inspection. Or when charging, a temperature measuring gun is used to measure the temperature of the connection parts in the exposed area to indirectly check the connection status of the high-voltage parts. The manual detection method is costly and has high risks.

In the prior art, the vehicle also arranges an NTC temperature sensor on the surface of some high-voltage connectors to detect the surface temperature, and the BMS system performs online inspection of the connection status of the high-voltage components according to the set temperature threshold, such as adding a temperature sensor to the charging socket to monitor. Temperature changes, indirectly check the connection status of the charging gun and the charging socket during charging. However, the location and number of temperature sensors are limited and cannot cover more high-voltage joints; The difference in capacity and heat source environment, the difference in temperature between winter and summer, etc. will cause the fluctuation and difference of monitoring temperature to become larger, resulting in missed or false alarms, and it is impossible to analyze the trend and trend of the monitored temperature data. It is unable to make early warning and judgment on the hidden problems of potential high-voltage parts connection, and does not have the ability to predict and avoid accidents such as thermal runaway in advance.

For the problem of inaccurate monitoring of the connection state of the battery high-voltage connector in the prior art, no effective solution has yet been proposed.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a monitoring method, a monitoring device and a processor for the connection state of a battery high voltage connector, so as to solve the problem of inaccurate monitoring of the connection state of the battery high voltage connector in the prior art.

In order to achieve the above object, according to an aspect of the present invention, a method for monitoring the connection state of a high-voltage connection part of a battery is provided, comprising: collecting a voltage difference value of the high-voltage connection part, wherein the voltage difference value is the voltage between the two ends of the high-voltage connection part Collect the current value of the high-voltage circuit where the high-voltage connection part is located; calculate the impedance value of the high-voltage connection part according to the voltage difference and current value; determine whether the impedance value is greater than the preset impedance threshold, and determine whether the impedance value is greater than the preset impedance value. In the case of the impedance threshold, a control command is generated, wherein the control command includes at least one of the following: a first warning command, a high-voltage circuit disconnection command; the control command is sent to the target device, and the target device responds to the control command.

Further, calculating the impedance value of the high-voltage connection component according to the voltage difference value and the current value includes: calculating the quotient of the voltage difference value and the current value to obtain the impedance value.

Further, the method further includes: repeatedly collecting voltage values and current values at preset time intervals to obtain multiple voltage values and multiple current values; calculating and obtaining multiple impedance values according to the multiple voltage values and multiple current values ; Generate an impedance change curve according to multiple impedance values; determine whether the impedance change curve satisfies a preset condition, and if the preset condition is met, generate a second early warning instruction; send the second early warning instruction to the target device, and the target device responds to the first 2. Early warning instructions.

Further, judging whether the impedance change curve satisfies the preset condition, and in the case of meeting the preset condition, generating a second early warning instruction, including: judging whether the impedance value of any adjacent preset number of groups in the impedance change curve is increasing, and When it is determined that the impedance values of any adjacent preset number of groups in the impedance change curve are increasing, a second warning instruction is generated.

Further, generating the control instruction includes: calculating the difference between the impedance value and the preset impedance threshold to obtain the impedance difference; judging whether the impedance difference is greater than the preset impedance difference; when it is determined that the impedance value is greater than the preset impedance difference Next, a high-voltage circuit disconnection command is generated, wherein the high-voltage circuit disconnection command is used to control the high-voltage circuit disconnection; when it is determined that the impedance value is less than or equal to the preset impedance difference value, a first warning command is generated.

Further, sending the control command to the target device, and the target device responding to the control command includes: sending the control command to at least one of a high-voltage power distribution unit and a vehicle-mounted instrument.

According to an embodiment of the present invention, there is also provided a monitoring device for the connection state of a high-voltage connection part of a battery. The device adopts the above method, and the device includes: a collection module for collecting the voltage difference of the high-voltage connection parts, and collecting the high-voltage connection The current value of the high-voltage circuit where the component is located, wherein the voltage difference value is the difference between the voltage values at both ends of the high-voltage connection component; the determination module is used to calculate the impedance value of the high-voltage connection component according to the voltage difference and current value; the judgment module , which is used to determine whether the impedance value is greater than the preset impedance threshold.

Further, the judgment module is a BMS system, and/or the acquisition module includes at least one of the following: a shunt and a Hall sensor.

According to one of the embodiments of the present invention, there is also provided a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the method in any one of the foregoing when running.

According to one of the embodiments of the present invention, there is also provided a processor for running a program, wherein the program is configured to execute the method of any one of the preceding items when the program is run.

Applying the technical solution of the present invention, first collect the voltage difference value of the high-voltage connection part, wherein the voltage difference value is the difference between the voltage values at both ends of the high-voltage connection part, collect the current value of the high-voltage circuit where the high-voltage connection part is located, and then according to the voltage Calculate the difference value and the current value to obtain the impedance value of the high-voltage connection component, and determine whether the impedance value is greater than the preset impedance threshold value, and in the case of determining that the impedance value is greater than the preset impedance threshold value, generate a control instruction, wherein the control instruction includes at least the following 1: The first warning command, the high-voltage circuit disconnection command, and finally the control command is sent to the target device, and the target device responds to the control command, achieving the purpose of monitoring the connection state of the battery high-voltage connector by using the impedance value of the high-voltage connecting component, and the monitoring result is accurate , reliable, not easily affected by the external environment, and achieves the effect of accurately monitoring the connection reliability of the high-voltage connecting parts. The technical solution of the present application solves the problem of inaccurate monitoring of the connection state of the battery high-voltage connecting parts in the prior art.

Description of drawings

The accompanying drawings forming a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

FIG. 1 shows a schematic block diagram of a first embodiment of a method for monitoring the connection state of a battery high-voltage connector according to the present invention applied to a terminal;

FIG. 2 shows a schematic flowchart of a second embodiment of a method for monitoring the connection state of a battery high-voltage connector according to the present invention;

Fig. 3 shows a schematic diagram of a third embodiment of the method for monitoring the connection state of a high-voltage connector of a battery according to the present invention;

FIG. 4 shows a schematic flowchart of a fourth embodiment of a method for monitoring the connection state of a battery high-voltage connector according to the present invention;

FIG. 5 shows a structural block diagram of the first embodiment of the monitoring device for the connection state of the battery high-voltage connector according to the present invention;

FIG. 6 shows a schematic block diagram of the second embodiment of the monitoring device for the connection state of the high-voltage connection part of the battery according to the present invention.

Wherein, the above-mentioned drawings include the following reference signs:

1. Power battery body;

2. High-voltage connectors;

3. Current data acquisition unit;

4. Connect the impedance module;

5. Battery management system BMS;

6. Vehicle instrumentation;

7. Power distribution unit PDU;

8. Electromagnetic relay.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

The method embodiments provided in the embodiments of the present application may be executed in a computer terminal, a computer terminal, or a similar computing device. Taking running on a computer terminal as an example, FIG. 1 is a hardware structural block diagram of a computer terminal according to a method for monitoring the connection state of a high-voltage battery connection piece according to an embodiment of the present invention. As shown in FIG. 1 , the computer terminal may include one or more (only one is shown in FIG. 1 ) processor 102 (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA, etc.) As well as the memory 104 for storing data, in an exemplary embodiment, the above-mentioned computer terminal may also include a transmission device 106 and an input-output device 108 for communication functions. Those of ordinary skill in the art can understand that the structure shown in FIG. 1 is only a schematic diagram, which does not limit the structure of the above-mentioned computer terminal. For example, the computer terminal may also include more or fewer components than those shown in FIG. 1 , or have a different configuration with equivalent or more functions than those shown in FIG. 1 .

The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer programs corresponding to the method for monitoring the connection state of the battery high-voltage connector in the embodiment of the present invention. A computer program, thereby executing various functional applications and data processing, implements the above-mentioned method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, memory 104 may further include memory located remotely from processor 102, which may be connected to a computer terminal through a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

Transmission means 106 are used to receive or transmit data via a network. The specific example of the above-mentioned network may include a wireless network provided by the communication provider of the computer terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, NIC for short), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (Radio Frequency, RF for short) module, which is used to communicate with the Internet in a wireless manner.

In an exemplary embodiment, when the method for monitoring the connection state of a high-voltage battery connector of the present application is applied to the technical field of vehicles, the vehicle includes a power battery body, a high-voltage connector, a current data acquisition unit, a connection impedance module, and a battery management system BMS. , Vehicle instrumentation, power distribution unit PDU, electromagnetic relay.

This embodiment provides a method for monitoring the connection state of a battery high-voltage connector running on the above-mentioned computer terminal. FIG. 2 is a flowchart of a method for monitoring the connection state of a battery high-voltage connector according to one embodiment of the present invention, as shown in FIG. 2, the process includes the following steps:

Step S31, collecting the voltage difference value of the high-voltage connection part, wherein the voltage difference value is the difference value of the voltage values at both ends of the high-voltage connection part, and collecting the current value of the high-voltage circuit where the high-voltage connection part is located;

It should be noted that the high-voltage connecting parts are high-voltage connecting parts, and the front and rear ends of the high-voltage connecting parts can be single battery cells, battery modules, battery boxes, etc. connection, plug and socket butt connection, etc.

In an exemplary embodiment, the voltage data Vt between the front and rear ends of the high-voltage connection components is collected by a voltage collection device, and signal amplification and drift value cleaning are performed. The current It on the high-voltage loop of the power battery collected using a shunt or a Hall sensor. The connection impedance module receives the current It and the voltage data Vt. It should be noted that the shunt may be a shunt of a battery management system (BMS).

Step S32, calculating and obtaining the impedance value of the high-voltage connection component according to the voltage difference and the current value;

In an exemplary embodiment, the connection impedance module is used to calculate the connection impedance Rt of the high-voltage connection component at this moment and the position; the smaller the Rt value, the better, and the smaller the Rt value, the higher the connection reliability of the high-voltage component, that is Rt=Vt/It.

Step S33, judging whether the impedance value is greater than the preset impedance threshold, and in the case of determining that the impedance value is greater than the preset impedance threshold, generate a control instruction, wherein the control instruction includes at least one of the following: a first warning instruction, a high-voltage circuit disconnection instruction ;

In an exemplary embodiment, the BMS system BMS compares and analyzes the Rt transmitted by the connection impedance module with the preset connection impedance alarm threshold R1, and when the Rt exceeds the alarm threshold R1, a first warning command is generated or the high-voltage circuit is disconnected. open command. It is worth noting that according to the changes in the conductor material, connection method, ambient temperature and heat dissipation form of the high-voltage components, different alarm thresholds R1 can be set for the high-voltage connection components in different positions, so as to accurately monitor the connection status of the high-voltage connection components.

In step S34, the control instruction is sent to the target device, and the target device responds to the control instruction.

The first warning instruction is used to control the target device to generate first warning information, the first warning information may be text displayed on the vehicle instrument, and the content of the text may be "high voltage connection failure". The high-voltage circuit disconnection command is used to control the target device to cut off the input and output of the high-voltage power battery through the relay on the high-voltage power distribution unit PDU.

Through the above steps, first collect the voltage difference value of the high-voltage connection part, wherein the voltage difference value is the difference between the voltage values at both ends of the high-voltage connection part, collect the current value of the high-voltage circuit where the high-voltage connection part is located, and then according to the voltage difference value, The current value is calculated to obtain the impedance value of the high-voltage connection component, and it is judged whether the impedance value is greater than the preset impedance threshold value, and in the case of determining that the impedance value is greater than the preset impedance threshold value, a control instruction is generated, wherein the control instruction includes at least one of the following: An early warning command, a high-voltage circuit disconnection command, and finally the control command is sent to the target device, and the target device responds to the control command, achieving the purpose of monitoring the connection state of the battery high-voltage connector by using the impedance value of the high-voltage connecting component, and the monitoring results are accurate and reliable. It is not easily affected by the external environment, and achieves the effect of accurately monitoring the connection reliability of the high-voltage connection parts. The technical solution of the present application solves the problem of inaccurate monitoring of the connection state of the battery high-voltage connection parts in the prior art.

Optionally, in step S32, calculating the impedance value of the high-voltage connection component according to the voltage difference value and the current value, including: calculating the quotient of the voltage difference value and the current value to obtain the impedance value.

In an optional embodiment, the method further includes: repeatedly collecting voltage values and current values at preset time intervals to obtain multiple voltage values and multiple current values; according to the multiple voltage values and multiple current values, Obtaining a plurality of impedance values by calculation; generating an impedance change curve according to the plurality of impedance values; judging whether the impedance change curve satisfies a preset condition, and generating a second early warning instruction under the condition that the preset condition is met; sending the second early warning instruction to the target device, and the target device responds to the second warning instruction.

That is to say, a specific monitoring frequency is set, and at each preset time interval, the voltage value at both ends of the high-voltage connection part and the current value of the high-voltage circuit are collected, and the multiple voltage values and multiple current values are used to calculate the number of high-voltage connection parts. impedance value at a time. Using multiple impedance values, an impedance change curve can be generated, and based on the impedance change curve, the future connection reliability change trend of the high-voltage connection component can be predicted. In an optional embodiment, the detection frequency can be set to be every 15 minutes.

Judging whether the impedance change curve satisfies the preset condition, and in the case of satisfying the preset condition, generating a second early warning instruction, including: judging whether the impedance value of any adjacent preset number of groups in the impedance change curve is increasing, and determining the impedance change When the impedance value of any adjacent preset number of groups in the curve increases, a second warning command is generated.

As shown in FIG. 3 , FIG. 3 is a connection impedance Rt trend diagram of an embodiment of the monitoring method for the connection state of a battery high voltage connector of the present application. In FIG. 3 , the connection impedance alarm threshold R1 is set to 16 μΩ, and the detection frequency is set to 15 Every minute, multiple calculated impedance values are formed into an impedance trend graph. It can be clearly noticed from Figure 2 that at about 120 minutes, the connection impedance Rt of the high-voltage connection component has exceeded the R1 value. At this time, the first An early warning instruction, wherein the first early warning instruction is used to control the target device to trigger the "high voltage connection failure" alarm. As shown in Figure 2, in the time period from 300min to 420min, the calculated eight connection impedance values Rt increase sequentially, and a second early warning command is generated at this time. "Warning.

Generating the control instruction includes: calculating the difference between the impedance value and the preset impedance threshold to obtain the impedance difference; judging whether the impedance difference is greater than the preset impedance difference; in the case of determining that the impedance value is greater than the preset impedance difference, generating a high voltage A circuit disconnection command, wherein the high-voltage circuit disconnection command is used to control the high-voltage circuit disconnection; when it is determined that the impedance value is less than or equal to a preset impedance difference value, a first warning command is generated.

For example, in this way, when it is detected that the high-voltage connection components are in different connection conditions, the classification process can be effectively performed. In the case that the impedance difference is greater than the preset impedance difference, that is, when the impedance value is far greater than the preset impedance threshold, a high-voltage circuit disconnection command is generated to prevent the connection state of the high-voltage connection components from affecting the output performance of the power battery and avoid safety issues. risk. When the difference between the impedance value and the preset impedance threshold is within an acceptable range, a first warning instruction is generated to remind the user to pay attention to the connection of the high-voltage connection components.

Sending the control command to the target device, and the target device responding to the control command includes: sending the control command to at least one of a high-voltage power distribution unit and a vehicle-mounted instrument.

Wherein, the high-voltage power distribution unit (PDU) is used for executing the high-voltage circuit disconnection command, and the vehicle-mounted instrument is used for executing the first warning command.

The method for monitoring the connection state of the battery high-voltage connector in the present application is suitable for the monitoring and early warning of the connection reliability of the high-voltage connector of the power battery system for new energy vehicles, that is, the connection reliability of the high-voltage connector at the current moment can be determined by using the impedance difference. For monitoring, the future reliability trend of high-voltage connection components can also be predicted by using impedance change curves generated from multiple impedance value data, avoiding the disadvantage of unpredictable reliability trends of high-voltage connectors in the prior art. For example, a temperature change curve composed of multiple temperature values is used to predict the connection state of a high-voltage connector. Because the temperature detection is easily affected by environmental variables, the temperature change curve itself has a large error. The connection state based on the temperature change curve Predictions are more inaccurate.

As shown in FIG. 4 , it is a schematic flowchart of another embodiment of the method of the present application, wherein the first warning instruction is to trigger a high voltage connection fault alarm, and the second early warning instruction is to trigger a high voltage connection deterioration warning.

From the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, the technical solutions of the present invention can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products are stored in a storage medium (such as ROM/RAM, magnetic disk, CD-ROM), including several instructions to make a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods of the various embodiments of the present invention.

This embodiment also provides a device for monitoring the connection state of a high-voltage connector of a battery. The device is used to implement the above-mentioned embodiments and preferred implementations, and what has already been described will not be repeated. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, implementations in hardware, or a combination of software and hardware, are also possible and contemplated.

FIG. 5 is a structural block diagram of an apparatus for monitoring the connection state of a high-voltage connection part of a battery according to an embodiment of the present invention. As shown in FIG. 5 , the apparatus includes: a collection module 42 for collecting the voltage difference of the high-voltage connection part , and collect the current value of the high-voltage circuit where the high-voltage connection part is located, wherein the voltage difference value is the difference between the voltage values at both ends of the high-voltage connection part; the determination module 44 is used to calculate the high-voltage connection part according to the voltage difference value and the current value. The judging module 46 is used for judging whether the impedance value is greater than the preset impedance threshold.

In an optional embodiment, the judgment module is a BMS system, the BMS is provided with a memory, and the memory is used to store a plurality of impedance value data, that is, the battery management system BMS has the capabilities of data reception, storage, comparison processing and trend judgment. At the same time, the BMS system can analyze the trend trend of the received consecutive multiple sets of Rt values. When the Rt shows abnormal large-scale fluctuations or a continuous upward trend, it can be judged that the high-voltage connection parts at the corresponding position have the risk of reducing the connection reliability. Generate and execute the second warning instruction to remind the operator to check and confirm. The determination module 44 is a connection impedance module, that is, the connection impedance module has the data reception, calculation processing, and data upload capabilities of the battery characteristic data (voltage value or current value). De-drift value function.

Through the above device, first collect the voltage difference value of the high-voltage connection part, wherein the voltage difference value is the difference between the voltage values at both ends of the high-voltage connection part, collect the current value of the high-voltage circuit where the high-voltage connection part is located, and then according to the voltage difference value, The current value is calculated to obtain the impedance value of the high-voltage connection component, and it is judged whether the impedance value is greater than the preset impedance threshold value, and in the case of determining that the impedance value is greater than the preset impedance threshold value, a control instruction is generated, wherein the control instruction includes at least one of the following: An early warning command, a high-voltage circuit disconnection command, and finally the control command is sent to the target device, and the target device responds to the control command, achieving the purpose of monitoring the connection state of the battery high-voltage connector by using the impedance value of the high-voltage connecting component, and the monitoring results are accurate and reliable. It is not easily affected by the external environment, and achieves the effect of accurately monitoring the connection reliability of the high-voltage connection parts. The technical solution of the present application solves the problem of inaccurate monitoring of the connection state of the battery high-voltage connection parts in the prior art.

It should be noted that the above modules can be implemented by software or hardware, and the latter can be implemented in the following ways, but not limited to this: the above modules are all located in the same processor; or, the above modules can be combined in any combination The forms are located in different processors.

The judgment module is a BMS system, and/or the acquisition module includes at least one of the following: a shunt and a Hall sensor. In an optional embodiment, a shunt or a Hall sensor is used to collect the current value of the high-voltage loop, and a connection impedance module is used to collect the voltage value at both ends of the high-voltage connection part.

As shown in FIG. 6 , a schematic diagram of a module of a device using the method for monitoring the connection state of a battery high-voltage connector of the present application, 1 is a power battery body, and the power battery body can be the most basic series-connected battery cells, battery modules, and battery packs. , battery box, etc. 2. The high-voltage connector connected to the power battery body on the main circuit can be in various forms such as welding, bolt connection, and connector connection. 3 is a current data acquisition unit, which is used to acquire the current It on the main circuit of the power battery, and the current data acquisition unit may be a shunt, a Hall sensor, and the like. 4 is to connect the impedance monitoring module, which is responsible for detecting the voltage signal data at both ends of the high-voltage connector 2, and obtains Vt after the voltage signal data is amplified, cleaned, and de-drifted, and the Vt is compared with the current data transmitted from the module 3. Calculate the connection resistance Rt of the high-voltage components. 5 is the battery management system BMS of the power battery. The BMS compares and analyzes the connection impedance Rt conducted in 4 with the preset connection impedance alarm threshold R1, and can perform trend analysis on the received consecutive groups of Rt values. 6 is the on-board instrument, which is used to execute the first warning command and the second warning command, that is, it can accept the warning and fault information transmitted by the module 5; 7 is the vehicle power distribution unit PDU, which can control the power battery through the installed electromagnetic relay 8 The main circuit is closed and disconnected, and the high-voltage circuit disconnection command is executed. The arrow line in FIG. 6 represents that the path is data transmission, and the direction of the arrow represents the direction of data transmission.

An embodiment of the present invention further provides a storage medium, where a computer program is stored in the storage medium, wherein the computer program is configured to execute the steps in any one of the above method embodiments when running.

Optionally, in this embodiment, the above-mentioned storage medium may be configured to store a computer program for executing the following steps:

Step S1, collecting the voltage difference value of the high-voltage connection part, wherein the voltage difference value is the difference value of the voltage values at both ends of the high-voltage connection part; collecting the current value of the high-voltage circuit where the high-voltage connection part is located;

Step S2, calculating the impedance value of the high-voltage connection part according to the voltage difference and the current value;

Step S3, judging whether the impedance value is greater than the preset impedance threshold, and in the case that the impedance value is determined to be greater than the preset impedance threshold, generate a control instruction, wherein the control instruction includes at least one of the following: a first warning instruction, a high-voltage circuit disconnection instruction ;

In step S4, the control instruction is sent to the target device, and the target device responds to the control instruction.

Optionally, in this embodiment, the above-mentioned storage medium may include but is not limited to: a USB flash drive, a read-only memory (Read-Only Memory, referred to as ROM), a random access memory (Random Access Memory, referred to as RAM), Various media that can store computer programs, such as removable hard disks, magnetic disks, or optical disks.

Embodiments of the present invention also provide a processor configured to run a computer program to perform the steps in any one of the above method embodiments.

Optionally, in this embodiment, the above-mentioned processor may be configured to execute the following steps through a computer program:

Step S1, collecting the voltage difference value of the high-voltage connection part, wherein the voltage difference value is the difference value of the voltage values at both ends of the high-voltage connection part; collecting the current value of the high-voltage circuit where the high-voltage connection part is located;

Step S2, calculating the impedance value of the high-voltage connection part according to the voltage difference and the current value;

Step S3, judging whether the impedance value is greater than the preset impedance threshold, and in the case that the impedance value is determined to be greater than the preset impedance threshold, generate a control instruction, wherein the control instruction includes at least one of the following: a first warning instruction, a high-voltage circuit disconnection instruction ;

In step S4, the control instruction is sent to the target device, and the target device responds to the control instruction.

In an optional embodiment, the interior of the 48V mild hybrid battery system for passenger vehicles is composed of two 24V modules connected in series, and the poles of the modules are bridged by aluminum bars. The charging and discharging conditions of the system are mainly based on the short pulse duration of high-rate current, which requires high pulse peak power input and output capabilities. Therefore, the connection impedance and contact impedance of the connecting parts on the main circuit must be reduced to avoid additional energy loss and heat generation. In addition, due to the long-term bumpy vibration of the vehicle operating conditions, important requirements are placed on the connection stability of the high-voltage connecting parts. In order to achieve the purpose of real-time and accurate monitoring of the connection state of the high-voltage connector, this embodiment is carried out according to the following steps:

Step 1: Arrange according to the architecture diagram in Figure 1, fasten the two acquisition lines for monitoring the terminal voltage Vt of the connector to the two ends of the two 24V module bridge-connected aluminum bars, and arrange the connection impedance monitoring and BMS. system.

Step 2: Set the interval T of the connection impedance Rt monitoring and reporting to the BMS every 15 minutes. The connection impedance alarm threshold R1 is set to 16μΩ. When the impedance value is greater than the impedance alarm threshold R1, a second warning command is generated, the fault alarm mode is displayed through the vehicle instrument, and the prompt content is "high voltage connection failure";

Step 3: Set the alarm threshold for the worsening trend of connection impedance Rt as "≥8 groups of Rt values show a continuous upward trend". When the impedance change curve satisfies this condition, a second warning command is generated, and the fault alarm mode is displayed on the vehicle meter , the prompt content is "The trend of high voltage connection is getting worse";

Step 4: As shown in FIG. 3 , make the 48V mild hybrid battery system used in the passenger car work continuously for 600 minutes. At the 120th minute, the high-voltage connection impedance value of 17.7μΩ is monitored, and the first warning command is generated, and the system prompts "high-voltage connection failure", prompting the user to stop the high-voltage connection components to check the high-voltage connection effect. At the 420th minute, 8 groups of Rt values have been monitored with a continuous upward trend, and a second warning command is generated. The system prompts "high pressure trend is worse", prompting the user to stop and check the high pressure connection effect at this location.

By adopting the technical solution of the present application, not only accurate and reliable online monitoring and alarming of connection failures of high-voltage connectors can be performed, but also early warning and prediction of potential connection failures of high-voltage connectors can be performed. Compared with the prior art, the technical solution of the present application can automatically monitor the connection reliability of the high-voltage components of the power battery at any time in the dynamic process. The detection method is safe, reliable, accurate and fast, and the detection results are hardly disturbed by environmental variables. When monitoring the connection failure of high-voltage components, the on-board instrument can be used to realize human-machine grading alarms. In case of serious alarms, the input and output of the power battery can be actively cut off through the PDU (high-voltage power distribution module) to prevent the occurrence of insulation and thermal runaway accidents; Data collection, storage, comparison and trend analysis of BMS can give early warning and judgment of potential high-voltage component connection failures.

By adopting the technical solution of the present application, a new inspection method is proposed in view of the shortcomings of the existing connection reliability inspection solutions for the high-voltage components of the power battery of new energy vehicles. Online monitoring, and at the same time provide early warning and judgment for the continuous deterioration of connection reliability through data trend analysis.

Optionally, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and optional implementation manners, and details are not described herein again in this embodiment.

The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages or disadvantages of the embodiments.

In the above-mentioned embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are only illustrative, for example, the division of units may be a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components may be combined or integrated into Another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of units or modules, and may be in electrical or other forms.

Units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , which includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes .

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as It is the protection scope of the present invention.

Claims (10)

1. A method for monitoring the connection state of a battery high-voltage connector, comprising: collecting a voltage difference value of the high-voltage connection part, wherein the voltage difference value is the difference value of the voltage values at both ends of the high-voltage connection part; collecting the current value of the high-voltage circuit where the high-voltage connection component is located; Calculate the impedance value of the high-voltage connection component according to the voltage difference value and the current value; Judging whether the impedance value is greater than a preset impedance threshold, and in the case of determining that the impedance value is greater than the preset impedance threshold, a control instruction is generated, wherein the control instruction includes at least one of the following: a first warning instruction, High voltage circuit disconnection command; The control instruction is sent to the target device, and the target device responds to the control instruction. 2 . The method according to claim 1 , wherein calculating the impedance value of the high-voltage connection component according to the voltage difference and the current value, comprising: 3 . The quotient of the voltage difference value and the current value is calculated to obtain the impedance value. 3. The method according to claim 1, wherein the method further comprises: Repeatedly collecting the voltage value and the current value at a preset time interval to obtain a plurality of the voltage values and a plurality of the current values; According to a plurality of the voltage values and a plurality of the current values, a plurality of the impedance values are obtained by calculation; generating an impedance variation curve according to a plurality of the impedance values; Judging whether the impedance change curve satisfies a preset condition, and generating a second early warning instruction when the preset condition is met; The second early warning instruction is sent to the target device, and the target device responds to the second early warning instruction. 4. The method according to claim 3, wherein judging whether the impedance change curve satisfies a preset condition, and in the case of satisfying the preset condition, generating a second warning instruction, comprising: Determine whether the impedance value of any adjacent preset number of groups in the impedance change curve is increasing, and in the case of determining that the impedance value of any adjacent preset number of groups in the impedance change curve is increasing, generate the Second warning order. 5. The method according to claim 1, wherein generating a control instruction comprises: calculating the difference between the impedance value and the preset impedance threshold to obtain an impedance difference; determining whether the impedance difference is greater than a preset impedance difference; In the case of determining that the impedance value is greater than the preset impedance difference value, generating the high-voltage circuit disconnection command, wherein the high-voltage circuit disconnection command is used to control the high-voltage circuit disconnection; The first warning instruction is generated when it is determined that the impedance value is less than or equal to the preset impedance difference value. 6. The method according to claim 1, wherein the control instruction is sent to a target device, and the target device responds to the control instruction, comprising: The control command is sent to at least one of a high-voltage power distribution unit and an on-board instrument. 7. A monitoring device for the connection state of a high-voltage connector of a battery, wherein the device adopts the method according to any one of claims 1 to 6, and the device comprises: a collection module, configured to collect the voltage difference value of the high-voltage connection part and collect the current value of the high-voltage circuit where the high-voltage connection part is located, wherein the voltage difference value is the difference value of the voltage values at both ends of the high-voltage connection part ; a determination module, configured to calculate the impedance value of the high-voltage connection component according to the voltage difference value and the current value; A judging module for judging whether the impedance value is greater than a preset impedance threshold. 8 . The monitoring device according to claim 7 , wherein the judging module is a BMS system, and/or the acquisition module comprises at least one of the following: a shunt and a Hall sensor. 9 . 9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein, when the program is run, a device where the computer-readable storage medium is located is controlled to execute claims 1 to 6 any of the methods described in . 10 . A processor, wherein the processor is configured to run a program, wherein the method of any one of claims 1 to 6 is executed when the program is run.

Images