CN216051966U - Test system for detecting safety state of battery management system - Google Patents

Test system for detecting safety state of battery management system Download PDF

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CN216051966U
CN216051966U CN202121562184.2U CN202121562184U CN216051966U CN 216051966 U CN216051966 U CN 216051966U CN 202121562184 U CN202121562184 U CN 202121562184U CN 216051966 U CN216051966 U CN 216051966U
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detection
module
bms
output
input end
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张明艳
邹玉峰
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Lishen Qingdao New Energy Co Ltd
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Lishen Qingdao New Energy Co Ltd
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Abstract

The utility model discloses a test system for detecting the safety state of a battery management system, which comprises a detection module, a main control module, a direct-current power supply module, a low-voltage power supply module, a high-voltage power supply module and an upper computer module, wherein the detection module is used for detecting the safety state of the battery management system; the input end of the detection module is connected with the output end of the battery management system BMS; the detection module is respectively connected with the low-voltage power supply module, the high-voltage power supply module and the main control module; the main control module is respectively connected with the battery management system BMS, the low-voltage power supply module, the high-voltage power supply module, the upper computer module and the direct-current power supply module; and the direct-current power supply module is also connected with the detection module. The test system for detecting the safety state of the battery management system, disclosed by the utility model, is scientific in design, improves the reliability of detection by introducing a hardware safety mechanism, can realize the safety state detection of the BMS, and can also realize the detection of the actual fault tolerance time interval FTTI required by the BMS for controlling the contactor to be disconnected.

Description

Test system for detecting safety state of battery management system
Technical Field
The utility model relates to the technical field of battery management system testing, in particular to a testing system for detecting the safety state of a battery management system.
Background
In the field of new energy application, lithium batteries are increasingly used in electronic and electrical products, such as electric vehicles, electric bicycles, electric tools, communication base stations, robots, and the like. In order to enable the lithium battery to be safely and reliably used, a Battery Management System (BMS) is required to be configured, and the BMS is used for monitoring the use state of the lithium battery and realizing protection functions such as overcharge, overdischarge and over-temperature.
Taking an electric automobile as an example, a vehicle-mounted BMS needs to conform to national standard GB/T34590-2017 road vehicle function safety or international standard ISO26262-2018 road vehicle function safety, wherein the function safety is to ensure the reliable operation of a certain function or to be able to detect the abnormality of the function by using a certain safety mechanism.
In order to determine whether the BMS meets the requirement of functional safety, the BMS needs to be tested according to the requirements of "GB/T39086-: it is confirmed whether the BMS enters a safe state within a prescribed Fault Tolerant Time Interval (FTTI), that is, whether the BMS can control the high voltage contactor to be turned off within the prescribed fault tolerant time interval FTTI, thereby breaking the physical connection between the load or the charging device and the battery system.
However, the conventional testing system for the BMS may detect whether the BMS opens the high voltage contactor, but may not detect the actual fault tolerance time interval FTTI (i.e., the time required to actually control the opening of the high voltage contactor) after the fault is injected. In addition, there is no redundant hardware safety mechanism for verifying whether the signal detection result is correct in connection with the detection of the BMS output signal by the test system.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a test system for detecting the safety state of a battery management system, aiming at the technical defects in the prior art.
Therefore, the utility model provides a test system for detecting the safety state of a battery management system, which comprises a detection module, a main control module, a direct-current power supply module, a low-voltage power supply module, a high-voltage power supply module and an upper computer module, wherein the detection module is used for detecting the safety state of the battery management system;
the input end 3 of the detection module is connected with the high-voltage positive output end HV1+ of the high-voltage power supply module;
the input end 5 of the detection module is connected with the high-voltage negative output end HV-of the high-voltage power supply module and is used for receiving a direct-current high-voltage power supply HV1 provided by the high-voltage power supply module;
the input end 4 of the detection module is connected with the high-voltage positive electrode output end HV2+ of the high-voltage power supply module;
the input end 5 of the detection module is connected with the high-voltage negative output end HV-of the high-voltage power supply module and is used for receiving a direct-current high-voltage power supply HV2 provided by the high-voltage power supply module;
the input end FD11 of the detection module is connected with the output end VO1 of the battery management system BMS and is used for receiving a control signal VO1 output by the BMS;
the input end FD21 of the detection module is connected with the output end VO2 of the BMS and is used for receiving a control signal VO2 output by the BMS;
the input end FD12 of the detection module is connected with the output end PD + of the BMS and is used for receiving the high voltage PD + output by the BMS;
the input end FD22 of the detection module is connected with the output end PD-of the BMS and is used for receiving the high voltage PD-output by the BMS;
the input end FC11 of the detection module is connected with the output end VO3 of the BMS and is used for receiving a control signal VO3 output by the BMS;
the input end FC21 of the detection module is connected with the output end VO4 of the BMS and is used for receiving a control signal VO4 output by the BMS;
the input end FC12 of the detection module is connected with the output end PC + of the BMS and is used for receiving the high voltage PC + output by the BMS;
the input end FD22 of the detection module is connected with the output end PC-of the BMS and is used for receiving the high voltage PC-output by the BMS;
the input end 1 of the detection module is connected with the output end VDD of the direct current power supply module and used for receiving a power supply VDD;
the input end 2 of the detection module is connected with the output end VCO of the BMS and is used for receiving the DC power supply VCO output by the BMS as a test object;
the output end DV1 of the detection module is connected with the input end 1 of the main control module and is used for providing a detection signal DV1 for the main control module;
the output end DV2 of the detection module is connected with the input end 2 of the main control module and is used for providing a detection signal DV2 for the main control module;
the output end DV5 of the detection module is connected with the input end 5 of the main control module and is used for providing a detection signal DV5 for the main control module;
the output end DV3 of the detection module is connected with the input end 3 of the main control module and is used for providing a detection signal DV3 for the main control module;
the output end DV4 of the detection module is connected with the input end 4 of the main control module and is used for providing a detection signal DV4 for the main control module;
the output end DV6 of the detection module is connected with the input end 6 of the main control module and is used for providing a detection signal DV6 for the main control module;
the output end CV1 of the detection module is connected with the input end 7 of the main control module and is used for providing a detection signal CV1 for the main control module;
the output end CV2 of the detection module is connected with the input end 8 of the main control module and is used for providing a detection signal CV2 for the main control module;
the output end CV5 of the detection module is connected with the input end 9 of the main control module and is used for providing a detection signal CV5 for the main control module;
the output end CV3 of the detection module is connected with the input end 10 of the main control module and is used for providing a detection signal CV3 for the main control module;
the output end CV4 of the detection module is connected with the input end 11 of the main control module and is used for providing a detection signal CV4 for the main control module;
the output end CV6 of the detection module is connected with the input end 12 of the main control module and is used for providing a detection signal CV6 for the main control module;
the input end 1 of the main control module is connected with the output end DV1 of the detection module and is used for receiving a detection signal DV1 output by the detection module;
the input end 2 of the main control module is connected with the output end DV2 of the detection module and is used for receiving a detection signal DV2 output by the detection module;
the input end 3 of the main control module is connected with the output end DV3 of the detection module and is used for receiving a detection signal DV3 output by the detection module;
the input end 4 of the main control module is connected with the output end DV4 of the detection module and is used for receiving a detection signal DV4 output by the detection module;
the input end 5 of the main control module is connected with the output end DV5 of the detection module and is used for receiving a detection signal DV5 output by the detection module;
the input end 6 of the main control module is connected with the output end DV6 of the detection module and is used for receiving a detection signal DV 6;
the communication end COM1 of the main control module is connected with the communication end 7 of the BMS and used for exchanging data with the BMS;
the communication end COM2 of the main control module is connected with the input end and the output end of the upper computer module and used for exchanging data with the upper computer module;
and the BUS communication end BUS of the master control module is respectively connected with the communication end of the low-voltage power supply module and the communication end of the high-voltage power supply module and is used for controlling the power output of the low-voltage power supply module and the high-voltage power supply module and the size of the output power supply.
Compared with the prior art, the test system for detecting the safety state of the battery management system has the advantages that the design is scientific, the functional safety design principle is followed, the detection reliability is improved by introducing the hardware safety mechanism, the safety state detection of the BMS can be realized, and the test system has great production practice significance.
Meanwhile, the testing system can also realize the detection of the actual fault tolerance time interval FTTI of the BMS.
For the technical scheme of the utility model, the hardware circuit design is scientific, the electronic components are of common application models, the model selection is easy, and the components are low in price, so that the technical scheme of the utility model has very high practical value and market popularization value.
Drawings
Fig. 1 is a block diagram illustrating a testing system for detecting a safety state of a battery management system according to the present invention;
fig. 2 is a schematic block diagram of a contactor in a testing system for detecting the safety state of a battery management system according to the present invention;
fig. 3 is a schematic block diagram illustrating a first detecting module combination of detecting modules for detecting a BMS discharging circuit contactor in a testing system for detecting a safety state of a battery management system according to the present invention;
fig. 4 is a block diagram schematically illustrating a second testing module combination of the testing modules for testing the contactors of the BMS charging circuit in the testing system for testing the safety state of the battery management system according to the present invention.
Detailed Description
In order to make the technical means for realizing the utility model easier to understand, the following detailed description of the present application is made in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 4, the present invention provides a test system for detecting a safety state of a Battery Management System (BMS), including a detection module 10, a main control module 20, a dc power module 30, a low voltage power module 40, a high voltage power module 50, and an upper computer module 60;
it should be noted that, referring to fig. 1, the BMS is a test object, and the test system is connected to corresponding external interfaces of the BMS through a plurality of external interfaces.
The input end 3 of the detection module 10 is connected with the high-voltage anode output end HV1+ of the high-voltage power supply module 50;
the input end 5 of the detection module 10 is connected with the high-voltage negative output end HV-of the high-voltage power supply module 50 and is used for receiving a direct-current high-voltage power supply HV1 provided by the high-voltage power supply module 50;
the input end 4 of the detection module 10 is connected with the high-voltage anode output end HV2+ of the high-voltage power supply module 50;
the input end 5 of the detection module 10 is connected with the high-voltage negative output end HV-of the high-voltage power supply module 50 and is used for receiving a direct-current high-voltage power supply HV2 provided by the high-voltage power supply module 50;
it should be noted that HV1+, HV-is used to simulate the high voltage of the battery system, and HV2+, HV-is used to provide the high voltage dc power supply to the detection module 10;
the input end FD11 of the detection module 10 is connected with the output end VO1 of the BMS and is used for receiving a control signal VO1 output by the BMS, and the control signal VO1 is used for controlling the on-off of a high-side contactor KL1 in a BMS discharge loop;
wherein the high-side contactor KL1 is connected in series on the line between the high-voltage positive output terminal HV1+ of the high-voltage power supply module 50 and the output terminal PD + of the BMS (see fig. 2);
it should be noted that, referring to fig. 2, the BMS discharge circuit includes a high-side contactor KL1 and a low-side contactor KL2, the input terminals of the BMS discharge circuit are HV1+ and HV ", respectively, and the output terminals of the BMS discharge circuit are PD + and PD-; wherein, high limit contactor KL1 and low limit contactor KL2 are the switch in the BMS discharge circuit respectively, and two contactors are closed, just communicate input and the output of BMS discharge circuit, and two contactors disconnection, then the input of disconnection BMS discharge circuit is connected with the output.
The input end FD21 of the detection module 10 is connected with the output end VO2 of the BMS and is used for receiving a control signal VO2 output by the BMS, and the control signal VO2 is used for controlling the on-off of a low-side contact KL2 in a BMS discharge loop; wherein the low side contactor KL2 is connected in series on the line between the high voltage negative output terminal HV-of the high voltage power supply module 50 and the output terminal PD-of the BMS (see fig. 2);
the input end FD12 of the detection module 10 is connected with the output end PD + of the BMS and is used for receiving the high voltage PD + output by the BMS; the high voltage PD + comes from the output terminal HV1+ of the high voltage power module 50 and is equal to the high voltage HV1+ provided to the input terminal 1 of the BMS, i.e., the high voltage HV1 +;
the input end FD22 of the detection module 10 is connected with the output end PD-of the BMS and is used for receiving the high voltage PD-output by the BMS; the high voltage PD + is the high voltage HV + provided from the output terminal HV-of the high voltage power supply module 50 to the input terminal 2 of the BMS, i.e., equal to the high voltage HV-;
the input end FC11 of the detection module 10 is connected to the output end VO3 of the BMS, and is used for receiving a control signal VO3 output by the BMS, and the control signal VO3 is used for controlling the on-off of a high-side contactor KL3 in a BMS charging loop; wherein, the high-side contactor KL3 is connected in series on the line between the high-voltage positive output terminal HV1+ of the high-voltage power supply module 50 and the output terminal PC + of the BMS (see fig. 2);
it should be noted that, referring to fig. 2, the BMS charging circuit includes a high-side contactor KL3 and a low-side contactor KL4, the input terminals of the BMS charging circuit are PC + and PC ", respectively, and the output terminals of the BMS charging circuit are HV1+ and HV-; high side contactor KL3 and low side contactor KL4 are the switch in the BMS charging circuit respectively, and two contactors are closed, just communicate input and the output of BMS charging circuit, and two contactors disconnection, then the input of disconnection BMS charging circuit and being connected of output.
The input end FC21 of the detection module 10 is connected to the output end VO4 of the BMS, and is used for receiving a control signal VO4 output by the BMS, and the control signal VO4 is used for controlling the on-off of a low-side contact KL4 in a BMS charging loop; the low-side contact KL4 is connected in series on the line between the high-voltage negative output terminal HV-of the high-voltage power supply module 50 and the BMS output terminal PC- (see fig. 2);
an input terminal FC12 of the detection module 10, connected to the output terminal PC + of the BMS, for receiving the high voltage PC + output from the BMS, the high voltage PC + coming from the output terminal HV1+ of the high voltage power supply module 50 and supplying the high voltage HV1+ to the input terminal 1 of the BMS, i.e. equal to the high voltage HV1 +;
input terminal FD22 of detection module 10, connected to output terminal PC of BMS, for receiving high voltage PC output from BMS, which high voltage PC is derived from high voltage HV supplied from output terminal HV of high voltage power supply module 50 to input terminal 2 of BMS, i.e., equal to high voltage HV-;
the input end 1 of the detection module 10 is connected to the output end VDD of the dc power supply module 30, and is configured to receive a power supply VDD (for example, 5V);
an input terminal 2 of the detection module 10 is connected to an output terminal VCO of the BMS, and is used for receiving a dc power supply VCO (for example, 12V or 24V) outputted by the BMS as a test object, wherein the dc power supply VCO is also a power supply for each contactor coil in the BMS (see fig. 2);
an output end DV1 of the detection module 10 is connected to the input end 1 of the main control module 20, and is configured to provide a detection signal DV1 for the main control module 20, where the DV1 signal is used to enable the main control module 20 to determine whether the BMS correctly controls the on/off of a high-side contact KL1 in a BMS discharge loop, and calculate a fault diagnosis time DT1 of the BMS during the discharge process;
it should be noted that the BMS fault diagnosis time DT1 in the discharging mode is the time (i.e., duration) from when the BMS detects that a fault occurs to when the BMS output terminal DV1 outputs the detection signal DV1 corresponding to the prescribed level, and is used to calculate the BMS fault tolerance time FTTI in the discharging mode, wherein FTTI is equal to the sum of the fault diagnosis time DT1 and the fault response time DT 2.
In the present invention, the BMS failure diagnosis time DT1 in the discharge mode is calculated by first turning off the high-side contactor KL1 and then turning off the low-side contactor KL 2.
In the present invention, in specific implementation, the signal state of the detection signal DV1 includes the following two types:
1. high level: the device is used for controlling the closing of a high-side contactor KL1 in a BMS discharge loop;
2. low level: and is used for controlling the high-side contactor KL1 in the BMS discharge loop to be opened.
The output end DV2 of the detection module 10 is connected to the input end 2 of the main control module 20, and is configured to provide a detection signal DV2 for the main control module 20, where the DV2 signal is used for the main control module 20 to determine whether the BMS correctly controls the on/off of the low-side contact KL2 in the BMS discharge loop; in the present invention, in specific implementation, the signal states of the detection signal DV2 include two types:
1. high level: the device is used for controlling the closing of a low-side contactor KL2 in a BMS discharge loop;
2. low level: for controlling the low-side contactor KL2 in the BMS discharge circuit to be turned off.
The output end DV5 of the detection module 10 is connected to the input end 5 of the main control module 20, and is configured to provide a detection signal DV5 for the main control module 20, where the DV5 signal is used to enable the main control module 20 to determine whether the BMS correctly controls the on/off of the high-side contact KL1 and the low-side contact KL2 in the BMS discharge loop;
in the present invention, in a specific implementation, the detecting signal state of the signal DV5 includes the following four types:
1. low level B2: controlling KL1 and KL2 to be disconnected;
2. high level B1: controlling KL1 and KL2 to be closed;
3. low level a 2: controlling KL1 to close and KL2 to open;
4. high level a 1: the KL1 is controlled to be open and the KL2 is controlled to be closed.
An output end DV3 of the detection module 10 is connected to the input end 3 of the main control module 20, and is configured to provide a detection signal DV3 for the main control module 20, where the DV3 signal is used for the main control module 20 to determine an on-off state of a high-side contact KL1 in a BMS discharge loop;
the output end DV4 of the detection module 10 is connected to the input end 4 of the main control module 20, and is configured to provide a detection signal DV4 for the main control module 20, where the detection signal is used to enable the main control module 20 to determine the on-off state of the low-side contactor KL2 in the BMS discharge circuit, and calculate the fault response time DT2 of the BMS;
it should be noted that the BMS fault response time DT2 in the discharging mode is the time (i.e., duration) from when the BMS output terminal DV1 outputs the detection signal DV1 corresponding to the prescribed level to when the BMS output terminal DV4 outputs the detection signal DV4 corresponding to the prescribed level, which is used to calculate the BMS fault tolerance time FTTI in the discharging mode, wherein FTTI is equal to the sum of the fault diagnosis time DT1 and the fault response time DT 2.
In the present invention, the BMS fault response time DT2 in the discharge mode is calculated by first turning off the high-side contactor KL1 and then turning off the low-side contactor KL 2.
An output end DV6 of the detection module 10 is connected to the input end 6 of the main control module 20, and is configured to provide a detection signal DV6 for the main control module 20, where the DV6 signal is used for the main control module 20 to determine on/off states of a high-side contact KL1 and a low-side contact KL2 in a BMS discharge loop;
in the present invention, in a specific implementation, the detecting signal state of the signal DV6 includes the following four types:
1. low level B2: controlling KL1 and KL2 to be disconnected;
2. high level B1: controlling KL1 and KL2 to be closed;
3. low level a 2: controlling KL1 to close and KL2 to open;
4. high level a 1: the KL1 is controlled to be open and the KL2 is controlled to be closed.
The output end CV1 of the detection module 10 is connected to the input end 7 of the main control module 20, and is configured to provide a detection signal CV1 for the main control module 20, where the CV1 signal is used for enabling the main control module 20 to determine whether the BMS controls the on/off of a high-side contact KL3 in a BMS charging loop, and calculate a fault diagnosis time CT1 of the BMS during the charging process;
it should be noted that the BMS fault diagnosis time CT1 in the charging mode is the time (i.e., duration) from when the BMS detects that a fault occurs to when the BMS output terminal CV1 outputs the detection signal CV1 corresponding to a prescribed level, and is used for calculating the actual BMS fault tolerance time FTTI in the charging mode, wherein FTTI is equal to the sum of the fault diagnosis time CT1 and the fault response time CT 2.
In the present invention, the BMS failure diagnosis time CT1 in the charge mode is calculated by first turning off the high-side contactor KL3 and then turning off the low-side contactor KL 4.
In the present invention, the detection of the signal state of the signal CV1 includes the following two methods:
1. high level: the device is used for controlling the closing of a high-side contactor KL3 in the BMS charging loop;
2. low level: for controlling the high side contactor KL3 in the BMS charging loop to open.
An output end CV2 of the detection module 10 is connected to the input end 8 of the main control module 20, and is configured to provide a detection signal CV2 for the main control module 20, where the CV2 signal is used for enabling the main control module 20 to determine whether the BMS controls on/off of a low-side contact KL4 in a BMS charging loop;
in the present invention, the detection of the signal state of the signal CV2 includes the following two methods:
1. high level: controlling a low-side contactor KL4 in the BMS charging loop to be closed;
2. low level: the low-side contactor KL4 in the BMS charging circuit is controlled to be turned off.
An output end CV5 of the detection module 10 is connected to the input end 9 of the main control module 20, and is configured to provide a detection signal CV5 for the main control module 20, where the CV5 signal is used for enabling the main control module 20 to determine whether the BMS controls on/off of a high-side contact KL3 and a low-side contact KL4 in a BMS charging loop;
in the present invention, the detection of the signal state of the signal CV5 includes the following four types:
1. low level B2: controlling KL3 and KL4 to be disconnected;
2. high level B1: controlling KL3 and KL4 to be closed;
3. low level a 2: controlling KL3 to close and KL4 to open;
3. high level a 1: the KL3 is controlled to be open and the KL4 is controlled to be closed.
An output end CV3 of the detection module 10 is connected to the input end 10 of the main control module 20, and is configured to provide a detection signal CV3 for the main control module 20, where the CV3 signal is used for enabling the main control module 20 to determine an on-off state of a high-side contact KL3 in a BMS charging loop;
in the present invention, the detection of the signal state of the signal CV3 includes the following two methods:
1. high level: controlling KL3 to close;
2. low level: control KL3 to turn off.
An output end CV4 of the detection module 10 is connected to the input end 11 of the main control module 20, and is configured to provide a detection signal CV4 for the main control module 20, where the detection signal is used for enabling the main control module 20 to determine an on-off state of a low-side contactor KL4 in a BMS charging loop, and calculate a fault response time CT2 of the BMS;
it should be noted that the BMS fault response time CT2 in the charging mode is the time (i.e., duration) from when the BMS output terminal DV1 outputs the detection signal CV1 corresponding to the prescribed level to when the BMS output terminal CV4 outputs the detection signal CV4 corresponding to the prescribed level, and is used for calculating the BMS fault tolerance time FTTI in the charging mode, wherein FTTI is equal to the sum of the fault diagnosis time CT1 and the fault response time CT 2.
In the present invention, the BMS fault response time CT2 in the charge mode is calculated by first turning off the high-side contactor KL3 and then turning off the low-side contactor KL 4.
In the present invention, the detection of the signal state of the signal CV4 includes the following two methods:
1. high level: controlling KL4 to close;
2. low level: control KL4 to turn off.
An output end CV6 of the detection module 10 is connected to the input end 12 of the main control module 20, and is configured to provide a detection signal CV6 for the main control module 20, where the CV6 signal is used for enabling the main control module 20 to determine on/off states of a high-side contact KL3 and a low-side contact KL4 in a BMS charging loop;
in the present invention, the detection of the signal state of the signal CV6 includes the following four types:
1. low level B2: controlling KL3 and KL4 to be disconnected;
2. high level B1: controlling KL3 and KL4 to be closed;
3. low level a 2: controlling KL3 to close and KL4 to open;
4. high level a 1: the KL3 is controlled to be open and the KL4 is controlled to be closed.
The high level a1, the low level a2, the high level B1, and the low level B2 are four different levels.
It should be noted that, for the detection signals DV5, DV6, CV5, and CV6, the magnitudes of the voltage amplitudes of the respective four signals are: high level a1 > high level B1 > low level a2 > low level B2.
The input end 1 of the main control module 20 is connected to the output end DV1 of the detection module 10, and is configured to receive the detection signal DV1 output by the detection module 10, and when the level of the DV1 signal changes from high to low, record a level transition time for calculating a fault diagnosis time DT1 of the BMS in the discharging mode;
the input end 2 of the main control module 20 is connected to the output end DV2 of the detection module 10, and is configured to receive the detection signal DV2 output by the detection module 10;
the input end 3 of the main control module 20 is connected to the output end DV3 of the detection module 10, and is configured to receive the detection signal DV3 output by the detection module 10;
the input end 4 of the main control module 20 is connected to the output end DV4 of the detection module 10, and is configured to receive the detection signal DV4 output by the detection module 10, record a level transition time when the level of the DV4 signal changes from high to low, and calculate a fault response time DT2 of the BMS in the discharging mode, and at the same time, determine whether the BMS enters a safe state;
in the discharging mode, the contactors KL1 and KL2 are both opened, which indicates that the BMS enters a safe state.
The input end 5 of the main control module 20 is connected to the output end DV5 of the detection module 10, and is configured to receive the detection signal DV5 output by the detection module 10, where the DV5 signal forms a detection signal state combination for on-off control of KL1 and KL2 contactors together with two signals, namely, a DV1 signal (a detection signal for controlling the high-side contactor KL 1) and a DV2 signal (a detection signal for controlling the low-side contactor KL 2), and determines whether to calculate the fault diagnosis time DT1 of the BMS in the discharging mode according to a determination result of the signal state combination.
In the utility model, the signal state combination for controlling the on-off of the KL1 and KL2 contactors is specifically as follows:
1. when both DV1 and DV2 are high, DV5 is high B1;
2. when both DV1 and DV2 are low, DV5 is low B2;
3. DV5 is high a1 when DV1 is low and DV2 is high;
4. DV5 is low a2 when DV1 is high and DV2 is low.
The judgment result of the signal state combination specifically includes two types of normal and fault, wherein if the signal state combination of DV5, DV1 and DV2 detected by the main control module 20 meets the above combination logic, the judgment result is normal, and BMS fault diagnosis time DT1 is calculated; if the combination of the signal states of DV5, DV1, DV2 detected by the main control module 20 does not conform to the above-mentioned combination logic, the result of the determination is a fault, the fault diagnosis time DT1 is not calculated, and the main control module 20 controls to disconnect the dc power outputs of the high-voltage power supply module 50 and the low-power supply module 40 in the testing system of the present invention if the result of the redetection is still a fault.
The input end 6 of the main control module 20 is connected to the output end DV6 of the detection module 10, and is configured to receive a detection signal DV6, where the DV6 signal forms a detection signal state combination of the on-off states of the KL1 and KL2 contactors together with two signals, namely, a DV3 signal (a detection signal for determining on-off of the high-side contactor KL 1) and a DV4 signal (a detection signal for determining on-off of the low-side contactor KL 2), and determines whether to calculate the fault response time DT2 of the BMS in the discharging mode according to a determination result of the signal state combination.
In the utility model, the signal state combination of the on-off states of the KL1 contactor and the KL2 contactor is designed as follows:
1. when both DV3 and DV4 are high, DV6 is high B1;
2. when both DV3 and DV4 are low, DV6 is low B2;
3. DV6 is high a1 when DV3 is low and DV4 is high;
4. DV6 is low a2 when DV3 is high and DV4 is low.
The judgment result of the signal state combination includes normal and fault, if the signal state combination of DV6, DV3 and DV4 detected by the main control module 20 conforms to the above combination logic, the judgment result is normal, and BMS fault response time DT2 is calculated; if the combination of the signal states of DV6, DV3, and DV4 detected by the main control module 20 does not conform to the above-mentioned combination logic, the result is determined to be a fault, the fault response time DT2 is not calculated, and the main control module 20 controls to disconnect the dc power outputs of the high-voltage power supply module 50 and the low-power supply module 40 in the testing system of the present invention if the result of the redetection is still a fault.
For the present invention, the main control module 20 is configured to calculate and obtain a fault diagnosis time DT1 of the BMS in the discharging mode according to the detection signals DV1, DV2, and DV5 output by the detection module 10, calculate and obtain a fault response time DT2 of the BMS in the discharging mode according to the detection signals DV3, DV4, and DV6 output by the detection module 10, then calculate an actual fault tolerance time interval FTTI of the BMS, and finally compare the actual fault tolerance time interval FTTI with a preset fault tolerance time interval FTTI of the BMS, and if the actual FTTI is greater than the preset FTTI, determine that the BMS does not enter the safety state; and if the actual FTTI is less than or equal to the preset FTTI, judging that the BMS enters a safe state.
Wherein the sum of the BMS fault diagnosis time DT1 and the BMS fault response time DT2 is equal to the BMS actual fault tolerance time interval FTTI in the discharging mode.
The communication terminal COM1 of the main control module 20 is connected with the communication terminal 7 of the BMS and used for exchanging data with the BMS;
the communication end COM2 of the main control module 20 is connected to the input and output ends of the upper computer module 60, and is used for exchanging data with the upper computer module 60, such as displaying fault information and alarm information;
a BUS communication end BUS of the main control module 20 is respectively connected with a communication end of the low-voltage power supply module 40 and a communication end of the high-voltage power supply module 50 through a BUS (BUS) and is used for controlling the power output of the low-voltage power supply module 40 and the high-voltage power supply module and the size of the output power; the BUS CAN be CAN BUS, RS485 BUS, GPIB BUS, etc.
The input end 15 of the main control module 20 is connected to the output end VDD of the dc power supply module 30 and is configured to receive the dc power supply VDD;
an output end VDD of the dc power module 30 is respectively connected to the input end 15 of the main control module 20 and the input end 1 of the detection module, and is configured to provide a dc power VDD for the detection module 10 and the main control module 20;
the communication end of the low-voltage power supply module 40 is connected with a BUS communication end BUS of the main control module 20, and is used for receiving the instruction output by the main control module 20 and exchanging data with the main control module 20;
the output terminal VCC1 of the low voltage power module 40 is connected to the input terminal 3 of the BMS, and is used for providing a dc working power supply, such as 5V, for the BMS;
the output terminal VCC2 of the low voltage power module 40 is connected to the input terminal 4 of the BMS, and is used for providing an operating power supply (see fig. 2), such as 12V or 24V, for the coils of the high side contacts KL1 and KL3 and the low side contacts KL2 and KL4 in the BMS;
an output terminal VCC3 of the low voltage power module 40, connected to the input terminal 5 of the BMS, for providing the BMS with a fault analog voltage, which includes a plurality of analog voltages of faults of overvoltage, undervoltage, overtemperature, overcurrent, etc. of the battery;
it should be noted that VCC3 is only one fault analog voltage interface, and if a plurality of fault analog voltages are required, a corresponding fault analog voltage output interface needs to be configured; the present invention is only illustrative of the operation of the test system through the fault simulation voltage interface, VCC3, and other fault simulation voltage output interfaces are not shown in fig. 1.
The number of output ports, VCC3, needs to be determined according to the number of battery cell strings managed by the BMS, for example: the BMS may manage 50 strings of cells and then 50 ports of VCC3 are needed to simulate the 50 string cell voltages.
The output terminal HV1+ of the high voltage power module 50 is connected to the input terminal 1 of the BMS for providing the BMS with a dc high voltage power HV1+ for simulating a high voltage positive terminal of a battery system in a discharging mode (see fig. 2);
the output terminal HV of the high voltage power supply module 50 is connected to the input terminal 2 of the BMS for providing the BMS with a dc high voltage power supply HV for simulating the high voltage negative of the battery system in the discharging mode and the charging mode (see fig. 2).
The output terminal HV2+ of the high voltage power supply module 50 is connected to the input terminal 3 of the BMS for providing a dc high voltage power supply HV2+ to the BMS for simulating the high voltage positive pole of the battery system in the charging mode (see fig. 2);
in the present invention, in a specific implementation, referring to fig. 3, the detection module 10 specifically includes a first detection module combination 10A;
the first detection module combination 10A comprises a first detection submodule 101, a second detection submodule 102, a third detection submodule 103, a fourth detection submodule 104, a fifth detection submodule 105 and a sixth detection submodule 106, wherein the six detection submodules are used for detecting the on-off of a high-side contactor KL1 and a low-side contactor KL2 (see fig. 2) in the BMS discharge circuit;
the input ends 1 of the first detection submodule 101 to the fifth detection submodule 105 are all connected with the output end VDD of the dc power supply module 30, and are used for receiving the dc power supply VDD;
the first detection submodule 101 is used for detecting a control signal VO1 which is output by the BMS and used for controlling the on-off of a high-side contactor KL1 in a BMS discharging loop; when the VO1 is at a low level, controlling a high-side contactor KL1 to be switched off; when the VO1 is at a high level, controlling a high-side contactor KL1 to be closed;
in a specific implementation, the input end 2 of the first detection submodule 101, which is used as the input end 2 of the detection module 10, is connected to the output end VCO of the BMS, and is configured to receive a direct current power supply VCO provided by the BMS;
the input terminal 3 of the first detection submodule 101, which is used as the input terminal FD11 of the detection module 10, is connected to the output terminal VO1 of the BMS, and is used for receiving the control signal VO1 output by the BMS and controlling the signal state of the output terminal DV1 of the first detection submodule 101;
the output end of the first detection submodule 101, which is used as the output end DV1 of the detection module 10, is used to provide the detection signal DV1 for the main control module, so that the main control module 20 can determine whether the BMS controls the on/off of the high-side contactor KL1 according to the detection signal DV1, and at the same time, is also used to calculate the fault diagnosis time DT of the BMS in the discharging mode.
In the present invention, in a specific implementation, when the control signal VO1 output by the BMS is at a low level and the input terminal FD11 of the detection module 10 is at a low level, the output terminal DV1 of the first detection submodule 101 is also at a low level, which indicates that the high-side contactor KL1 is turned off; when the control signal VO1 output by the BMS is at a high level and the input FD11 of the detection module 10 is at a high level, the output DV1 of the first detection submodule 101 is also at a high level, which indicates that the high-side contact KL1 is closed;
the second detection submodule 102 is used for detecting a control signal VO2 which is output by the BMS and used for controlling the on-off of the low-side contactor KL2 in the BMS discharge loop;
in the utility model, in specific implementation, when the VO2 is at a low level, the low-side contactor KL2 is controlled to be disconnected; when VO2 is at high level, controlling KL2 of the low-side contactor to be closed;
in a specific implementation, the input end 2 of the second detection submodule 102, which is used as the input end 2 of the detection module 10, is connected to the output end VCO of the BMS, and is configured to receive the dc power supply VCO provided by the BMS;
the input terminal 3 of the second detection submodule 102, which is the input terminal FD21 of the detection module 10, is connected to the output terminal VO2 of the BMS, and is configured to receive the control signal VO2 output by the BMS and control the signal state of the output terminal DV2 of the second detection submodule 102 according to the control signal VO 2;
the output terminal of the second detection sub-module 102, which is the output terminal DV2 of the detection module 10, is used to provide the detection signal DV2 for the main control module 20, so that the main control module 20 can determine whether the BMS controls the on/off of the low-side contactor KL2 in the BMS discharge circuit according to the signal state of the detection signal DV 2.
In the present invention, in a specific implementation, when the control signal VO2 output by the BMS is at a low level, and the input terminal FD21 of the detection module 10 is at a low level, the output terminal DV2 of the second detection submodule 102 is also at a low level, which indicates that the low-side contactor KL2 is turned off; when the control signal VO2 output by the BMS is at a high level and the input FD21 of the detection module 10 is at a high level, the output DV2 of the second detection submodule 102 is also at a high level, which indicates that the low-side contact KL2 is closed;
the third detection submodule 103 is used for detecting the on-off of a high-side contactor KL1 in the BMS discharge circuit;
in a specific implementation, the input end 2 of the third detection submodule 103, serving as the input end 4 of the detection module 10, is connected to the output end HV2+ of the high-voltage power supply module 50, and is configured to receive the positive high voltage HV2+ output by the high-voltage power supply module 50;
the input terminal 3 of the third detection submodule 103, which is the input terminal FD12 of the detection module 10, is configured to receive the high voltage PD + output from the BMS output terminal PD + and thereby control the output terminal DV3 of the third detection submodule 103;
the input end 4 of the third detection submodule 103, which is used as the input end 5 of the detection module 10, is connected with the output end HV-of the high-voltage power supply module 50, and is used for receiving the negative high voltage HV-output by the high-voltage power supply module 50;
an output end DV3 of the third detection sub-module 103, serving as the output end DV3 of the detection module 10, is configured to provide a detection signal DV3 for the main control module 20, so that the main control module 20 determines, according to a signal state of the detection signal DV3, whether the high-side contactor KL1 is on or off in the BMS discharge circuit;
in the present invention, in a specific implementation, when the control signal VO1 output by the BMS is at a low level and the input terminal FD11 of the detection module 10 is at a low level, the high-side contactor KL1 is controlled to be turned off, the high-side contactor KL1 disconnects the high voltage HV1+ from the input terminal FD12(PD +) of the detection module 10, so that the input terminal 3 of the third detection submodule 103 is not connected with the high voltage PD +, and the output terminal DV3 of the third detection submodule 103 is at a low level, which indicates that the high-side contactor KL1 is turned off; when the control signal VO1 output by the BMS is at a high level, so that the input end FD11 of the detection module 10 is at a high level, the high-side contactor KL1 is controlled to be closed, the high-side contactor KL1 is communicated with the input end FD12(PD +) and the high-voltage HV1+ of the detection module 10, so that the high-voltage HV1 is connected between the input end 3 and the input end 4 of the third detection submodule 103, and then the output end DV3 of the third detection submodule 103 is at a high level, which indicates that the high-side contactor KL1 is closed.
The fourth detection submodule 104 is used for detecting the on-off of the low-side contactor KL2 in the BMS discharge circuit;
in a specific implementation, the input end 2 of the fourth detection submodule 104, serving as the input end 4 of the detection module 10, is connected to the output end HV2+ of the high-voltage power supply module 50, and is configured to receive the positive high-voltage HV2+ output by the high-voltage power supply module 50;
an input end 3 of the fourth detection submodule 104, serving as the input end 3 of the detection module 10, is connected to an output end HV1+ of the high-voltage power supply module 50, and is configured to receive a high-voltage positive electrode HV1+ output by the high-voltage power supply module 50;
the input terminal 4 of the fourth detection submodule 104, which is used as the input terminal FD22 of the detection module 10, is used for receiving the high voltage negative PD-output by the BMS, so as to control the signal state of the output terminal DV4 of the fourth detection submodule 104;
the output terminal of the fourth detection submodule 104, which is the output terminal DV4 of the detection module 10, is configured to provide the detection signal DV4 for the main control module 20, so that the main control module 20 determines the on-off state of the low-side contactor KL2 in the BMS discharge loop according to the signal state of the detection signal DV4, and is also configured to calculate the fault response time DT2 of the BMS in the discharge mode.
In the present invention, in a specific implementation, when the control signal VO2 output by the BMS is at a low level and the input terminal FD21 of the detection module 10 is at a low level, the low-side contact KL2 is turned off, the input terminal FD22 of the detection module 10 is disconnected from the high voltage HV-, the input terminal FD22 of the detection module 10 is in a high impedance state, and the output terminal DV4 of the fourth detection submodule 104 is at a low level; when the control signal VO2 output by the BMS is at a high level, such that the input terminal FD21 of the detection module 10 is at a high level, the low-side contact KL1 is closed to connect the input terminal FD22 of the detection module 10 with the high voltage HV-, such that the high voltage HV1 is connected between the input terminal 3 and the input terminal 4 of the fourth detection submodule 104, and the output terminal DV4 of the fourth detection submodule 104 is at a high level.
The fifth detection submodule 105 is configured to enable the main control module 20 to determine whether the BMS correctly controls on/off of a high-side contact KL1 and a low-side contact KL2 in the BMS discharge circuit;
it should be noted that the fifth detection submodule 105 is also a hardware safety mechanism for the first detection submodule 101 and the second detection submodule 102, and the main control module 20 determines whether the signal states of the control signals VO1 and VO2 output by the BMS for the high-side contact KL1 and the low-side contact KL2 are correctly detected by determining the combined states of the output signals DV5, DV1, DV2 of the three detection submodules;
in a specific implementation, the input end 2 of the fifth detection sub-module 105, which is used as the input end 2 of the detection module 10, is connected to the output end VCO of the BMS, and is configured to receive the dc power supply VCO provided by the BMS;
the input terminal 3 of the fifth detection submodule 105, which is the input terminal FD11 of the detection module 10, is connected to the output terminal VO1 of the BMS, and is configured to receive the control signal VO1 output by the BMS, so as to control the signal status of the output terminal DV5 of the fifth detection submodule 105;
the input terminal 4 of the fifth detection submodule 105, which is the input terminal FD21 of the detection module 10, is connected to the output terminal VO2 of the BMS, and is configured to receive the control signal VO2 output by the BMS, so as to control the signal state of the output terminal DV5 of the fifth detection submodule 105;
in the present invention, in a specific implementation, the fifth detection submodule 105 is used as a hardware security mechanism, and is configured to synchronously detect the signal states of the input ends FD11 and FD21 of the detection module 10, and the signal state of the output end DV5 changes correspondingly, specifically as follows:
1, when the FD11 and the FD21 are all in a low level, DV5 is in a low level B2;
2, when the FD11 and the FD21 are all high level, DV5 is high level B1;
3, FD11 is low and FD21 is high, DV5 is high a 1;
4, FD11 is high and FD21 is low, DV5 is low a 2.
In the utility model, in a concrete implementation, the high level A1 > the high level B1 > the low level A2 > the low level B2, wherein the low level B2 is 0V, and the high level A1 is close to the power supply VDD.
Referring to fig. 2 and 3, when the BMS outputs the control signals VO1 and VO2 both at a low level such that the input terminals FD11 and FD21 of the detection module 10 are at a low level, the signal DV5 output by the fifth detection sub-module 105 is at a low level B2, and the voltage amplitude thereof is 0V; the low-level control signals VO1 and VO2 control the high-side contactor KL1 and the low-side contactor KL2 to be turned off.
When the control signals VO1 and VO2 are both high, and the input terminals FD11 and FD21 of the detection module 10 are high, the signal DV5 output by the fifth detection sub-module 105 is high B, and its voltage amplitude is smaller than the high a;
it should be noted that the high control signals VO1 and VO2 control the high-side contactor KL1 and the low-side contactor KL2 to be closed.
When the control signal VO1 is at a low level, such that the input terminal FD11 of the detection module 10 is at a low level, and the control signal VO2 is at a high level, such that the input terminal FD21 of the detection module 10 is at a high level, the signal DV5 output by the fifth detection sub-module 105 is at a high level a1, and the voltage amplitude thereof is close to the power VDD output by the dc power module 30;
the low-level control signal VO1 controls the high-side contactor KL1 to be opened, and the high-level control signal VO2 controls the low-side contactor KL2 to be closed.
When the control signal VO1 is high, such that the FD11 is high and the control signal VO2 is low, such that the FD21 is low, the signal DV5 output by the fifth detection sub-module 105 is at a low level a2, whose voltage magnitude is greater than 0V of the low level B2 and less than the high level B1;
the high-level control signal VO1 controls the high-side contactor KL1 to be closed, and the low-level control signal VO2 controls the low-side contactor KL2 to be opened.
The output end of the fifth detection sub-module 105, which is the output end DV5 of the detection module 10, is configured to provide the detection signal DV5 for the main control module 20, so that the main control module 20 determines whether the signal states of the control signals VO1 and VO2 output by the BMS for the high-side contact KL1 and the low-side contact KL2 are correctly detected according to the detection signal state combination formed by the detection signal DV5 and the detection signals DV1 and DV2 for on-off control of the contacts; meanwhile, it is decided whether to calculate the fault diagnosis time DT1 of the BMS in the discharging mode according to the determination result of the combination of the states of the detection signals.
In the utility model, the designed signal state combination for controlling the on-off of the high-side contact KL1 and the low-side contact KL2 is as follows:
1. when the detection signals DV1 and DV2 are both at a low level, the detection signal DV5 is at a low level B2;
2. when the detection signals DV1 and DV2 are both at a high level, the detection signal DV5 is at a high level B1;
3. when the detection signal DV1 is high and the detection signal DV2 is low, the detection signal DV5 is low A2;
4. when the detection signal DV1 is at a low level and the detection signal DV2 is at a high level, the detection signal DV5 is at a high level A1;
in the utility model, in a concrete implementation, the high level A1 > the high level B1 > the low level A2 > the low level B2, wherein the low level B2 is 0V, and the high level A1 is close to the power supply VDD.
In particular, the judgment result of the signal state combination includes two types: normal and failed, wherein if the signal state combination of DV5, DV1, DV2 detected by the main control module 20 conforms to the above-mentioned combinational logic, the result is determined to be normal, and BMS failure diagnosis time DT1 is calculated;
if the signal state combination of DV5, DV1, DV2 detected by the main control module 20 does not conform to the above-mentioned combinational logic, the determination result is a fault, the fault diagnosis time DT1 is not calculated, and the detection is performed again, and if the detection result is still a fault, the main control module 20 will control to disconnect the dc power output of the high voltage power supply module 50 and the low power supply module 40 in the test system.
The sixth detection submodule 106 is configured to enable the main control module 20 to determine on-off states of a high-side contact KL1 and a low-side contact KL2 in the BMS discharge circuit;
it should be noted that the sixth detection submodule 106 is also a hardware safety mechanism for the third detection submodule 103 and the fourth detection submodule 104, and the main control module 20 determines whether the on-off states of the high-side contactor KL1 and the low-side contactor KL2 are correctly detected by determining the combined states of the output signals DV6, DV3, DV4 of the three detection submodules;
in a specific implementation, the input end 2 of the sixth detection submodule 106, serving as the input end 4 of the detection module 10, is connected to the output end HV2+ of the high-voltage power supply module 50, and is configured to receive the positive high voltage HV2+ output by the high-voltage power supply module 50;
the input terminal 3 of the sixth detection submodule 106, which is the input terminal FD12 of the detection module 10, receives the high voltage PD + output from the BMS output terminal PD + and thus controls the signal state of the output terminal DV6 of the sixth detection submodule 106;
an input terminal 4 of the sixth detection submodule 106, serving as an input terminal 5 of the detection module 10, is connected to the output terminal HV-of the high-voltage power supply module 50, and is configured to receive the negative high voltage HV-output by the high-voltage power supply module 50, so as to control a signal state of the output terminal DV6 of the sixth detection submodule 106;
the input terminal 5 of the sixth detection submodule 106, serving as the input terminal 3 of the detection module 10, is connected to the output terminal HV1+ of the high-voltage power supply module 50, and is configured to receive the positive high voltage HV1+ output by the high-voltage power supply module 50, so as to control the signal state of the output terminal DV6 of the sixth detection submodule 106;
the input terminal 6 of the sixth detection submodule 106, which is the input terminal FD22 of the detection module 10, receives the high voltage PD-output from the BMS output terminal PD-, thereby controlling the signal state of the output terminal DV6 of the sixth detection submodule 106;
in a specific implementation of the present invention, the sixth detection submodule 106 is used as a hardware security mechanism, and is configured to synchronously detect signal states of the input terminals FD12 and FD22 of the detection module 10, where a signal state of the output terminal DV6 changes correspondingly, specifically as follows:
1, when the FD12 and the FD22 are all in a low level, DV5 is in a low level B2;
2, when the FD12 and the FD22 are all high level, DV5 is high level B1;
3, FD12 is low and FD22 is high, DV5 is high a 1;
4, FD12 is high and FD22 is low, DV5 is low a 2.
In the utility model, in a concrete implementation, the high level A1 > the high level B1 > the low level A2 > the low level B2, wherein the low level B2 is 0V, and the high level A1 is close to the power supply VDD.
Referring to fig. 2 and 3, in the discharging mode, when the BMS output terminals VO1 and VO2 are both at low level and the input terminals FD11 and FD21 of the detection module 10 are at low level, the high-side contactor KL1 and the low-side contactor KL2 are both opened, wherein the high-side contactor KL1 disconnects the input terminal 3 of the sixth detection submodule 106 from the high-voltage HV1+, the low-side contactor KL2 disconnects the input terminal 6 of the sixth detection submodule 106 from the high-voltage HV- > so that the high-voltage power source HV2 cannot provide the sixth detection submodule 106 with dc high voltage and current through the input terminal 2 and the input terminal 4, the input terminal 2 and the input terminal 6 of the sixth detection submodule 106, and the signal DV6 output by the sixth detection submodule 106 is at low level B2 and has a voltage amplitude of 0V;
when BMS output terminals VO1 and VO2 are both at a high level, and input terminals FD11 and FD21 of the detection module 10 are both at a high level, a high-side contact KL1 and a low-side contact KL2 are both closed, wherein the high-side contact KL1 connects the input terminal 3 of the sixth detection submodule 106 with the high voltage HV1+, the low-side contact KL2 connects the input terminal 6 of the sixth detection submodule 106 with the high voltage HV-, so that the high voltage power HV2 can supply a dc high voltage and a current to the sixth detection submodule 106 through the input terminal 2 and the input terminal 4, the input terminal 2 and the input terminal 6 of the sixth detection submodule 106 at the same time, and then the signal DV6 output by the sixth detection submodule 106 is at a high level B1, and the voltage amplitude of which is smaller than the high level a1 (the voltage of the high level a1 is close to the power VDD);
when BMS output terminal VO1 is at low level, so that input terminal FD11 of the detection module 10 is at low level, BMS output terminal VO2 is at high level, and input terminal FD21 of the detection module 10 is at high level, VO1 at low level controls the high side contactor KL1 to open, so that no high voltage HV1 is connected between input terminal 3 and input terminal 4 of the sixth detection submodule 106, so that the high voltage power HV2 cannot provide dc high voltage and current for the sixth detection submodule 106 through input terminal 2 and input terminal 4, and VO2 at high level controls the low side contactor KL2 to close, so that high voltage HV1 is connected between input terminal 5 and input terminal 6 of the sixth detection submodule 106, so as to control the high voltage power HV2 to provide dc high voltage and current for the sixth detection submodule 106 through input terminal 2 and input terminal 6, and then signal DV6 output by the sixth detection submodule 106 is at high level a1, the voltage amplitude of the power supply is close to the power supply VDD output by the direct current power supply module 30;
when the BMS output VO1 is high, the input FD11 of the detection module 10 is high. And when the BMS output terminal VO2 is at a low level and the FD21 is at a low level, the high level VO1 controls the high side contactor KL1 to be closed, so that a high voltage HV1 is connected between the input terminal 3 and the input terminal 4 of the sixth detection submodule 106, thereby controlling the high voltage power supply HV2 to provide dc high voltage and current to the sixth detection submodule 106 via input 2 and input 4, and VO2 with low level controls the low-side contactor KL2 to be turned off, so that no high voltage HV1 is connected between the input terminal 5 and the input terminal 6 of the sixth detection submodule 106, so that a high voltage power source HV2 cannot supply a dc high voltage and current to the sixth detection submodule 106 through the input terminal 2 and the input terminal 6, the signal DV6 output by the sixth detection submodule 106 is low level a2, whose voltage amplitude is greater than 0V of low level B2 and less than high level B1 (high level B1 is less than high level a 1);
the output end of the sixth detection submodule 106, which is used as the output end DV6 of the detection module 10, is configured to provide a detection signal DV6 for the main control module, so that the main control module 20 determines whether the on-off states of the high-side contact KL1 and the low-side contact KL2 are correctly detected according to a detection signal state combination of the detection signal DV6 and the detection signal DV3, DV4 for contactor on-off control; meanwhile, whether to calculate the BMS fault response time DT2 in the discharging mode is decided by the determination result of the detection signal state combination.
In the utility model, in a specific implementation, the signal state combination of the on-off state of the contactor designed by the utility model is as follows:
1. when both DV3 and DV4 are low, DV6 is low B2;
2. when both DV3 and DV4 are high, DV6 is high B1;
3. DV6 is low a2 when DV3 is high and DV4 is low;
4. DV6 is high a1 when DV3 is low and DV4 is high;
in the utility model, in a concrete implementation, the high level A1 > the high level B1 > the low level A2 > the low level B2, wherein the low level B2 is 0V, and the high level A1 is close to the power supply VDD.
In a specific implementation, the judgment result of the signal state combination includes a normal state and a fault state, wherein if the signal state combination of DV6, DV3 and DV4 detected by the main control module 20 meets the above combination logic, the judgment result is normal, and the BMS fault response time DT2 is calculated;
if the signal state combination of DV6, DV3, DV4 detected by the main control module 20 does not conform to the above-mentioned combinational logic, the determination result is a fault, the fault response time DT2 is not calculated, and the detection is performed again, and if the detection result is still a fault again, the main control module 20 will control to disconnect the dc power output of the high voltage power supply module 50 and the low voltage power supply module 40 in the test system.
In the present invention, the fault tolerance time FTTI is equal to the sum of the fault diagnosis time DT1 and the fault response time DT2 in the discharging mode of the BMS.
In the present invention, in a specific implementation, referring to fig. 4, the detection module 10 includes a second detection module combination 10B;
the second detection module combination 10B specifically includes an eleventh detection submodule 111, a twelfth detection submodule 112, a thirteenth detection submodule 113, a fourteenth detection submodule 114, a fifteenth detection submodule 115 and a sixteenth detection submodule 116, and the six detection submodules are used for detecting on/off of a high-side contactor KL3 and a low-side contactor KL4 (see fig. 2) in the BMS charging circuit;
it should be noted that the working principles of the eleventh to sixteenth detection sub-modules 111 to 116 are the same as the working principles of the first to sixth detection sub-modules 101 to 106, respectively (for example, the working principle of the eleventh detection sub-module 111 is the same as that of the first detection sub-module 101, and so on), except that the connection objects of the external interfaces are different, the connection relationship between each detection sub-module and the connection object is explained and explained below, and the working principle of each detection sub-module is not repeated.
The input ends 1 of the eleventh detection submodule 111 to the sixteenth detection submodule 116 are all connected with the output end VDD of the dc power supply module 30, and are configured to receive the dc power supply VDD;
the eleventh detection submodule 111 is used for detecting a control signal VO3 which is output by the BMS and used for controlling the on-off of the high-side contactor KL3 in the BMS charging loop;
in a specific implementation, the input end 2 of the eleventh detection sub-module 111, which is used as the input end 2 of the detection module 10, is connected to the output end VCO of the BMS, and is configured to receive the dc power supply VCO provided by the BMS;
the input terminal 3 of the eleventh detection submodule 111, which is the input terminal FC11 of the detection module 10, is connected to the output terminal VO1 of the BMS, and is configured to receive the control signal VO3 output by the BMS and control the signal state of the output terminal CV1 of the eleventh detection submodule 111;
the output end of the eleventh detection sub-module 111, which is the output end CV1 of the detection module 10, is configured to provide the detection signal CV1 for the main control module, so that the main control module 20 determines whether the BMS controls the on/off of the high side contactor KL3 in the BMS charging circuit according to the detection signal CV 1.
The twelfth detection submodule 112 is configured to detect a control signal VO4 output by the BMS and used for controlling on/off of the low-side contactor KL4 in the BMS charging circuit;
in a specific implementation, the input end 2 of the twelfth detection sub-module 112, which is used as the input end 2 of the detection module 10, is connected to the output end VCO of the BMS, and is configured to receive the dc power supply VCO provided by the BMS;
the input terminal 3 of the twelfth submodule 112, serving as the input terminal FC21 of the detection module 10, is connected to the output terminal VO4 of the BMS, and is configured to receive the control signal VO4 output by the BMS and control the signal state of the output terminal CV2 of the twelfth submodule 112 according to the control signal VO 4;
the output terminal of the twelfth submodule 112, which is the output terminal CV2 of the detecting module 10, is used to provide the detecting signal CV2 for the main control module, so that the main control module 20 can determine whether the BMS controls the on/off of the low-side contactor KL4 in the BMS charging circuit according to the signal state of the detecting signal CV 2.
The thirteenth detection submodule 113 is configured to detect on/off of a high-side contactor KL3 in the BMS charging loop;
in a specific implementation, the input end 2 of the thirteenth detection submodule 113, serving as the input end 4 of the detection module 10, is connected to the output end HV2+ of the high-voltage power supply module 50, and is configured to receive the positive high voltage HV2+ output by the high-voltage power supply module 50;
an input terminal 3 of the thirteenth sensing submodule 113, serving as an input terminal FC12 of the sensing submodule 10, is configured to receive the high voltage PC + output from the BMS output terminal PC +, thereby controlling an output terminal CV3 of the thirteenth sensing submodule 113;
the input end 4 of the thirteenth detection submodule 113, which is used as the input end 5 of the detection module 10, is connected with the output end HV-of the high-voltage power supply module 50, and is used for receiving the negative high voltage HV-output by the high-voltage power supply module 50;
an output end CV3 of the thirteenth detection sub-module 113, serving as an output end CV3 of the detection module 10, is configured to provide a detection signal CV3 for the main control module, so that the main control module 20 determines, according to a signal state of the detection signal CV3, whether the KL3 of the high-side contactor in the BMS charging loop is on or off;
the fourteenth detection submodule 114 is configured to detect on/off of the low-side contactor KL4 in the BMS charging loop;
in a specific implementation, the input end 2 of the fourteenth detection submodule 114, which is used as the input end 4 of the detection module 10, is connected to the output end HV2+ of the high-voltage power supply module 50, and is used for receiving the positive high voltage HV2+ output by the high-voltage power supply module 50;
an input end 3 of the fourteenth detection submodule 114, which is used as the input end 3 of the detection module 10, is connected to the output end HV1+ of the high-voltage power supply module 50, and is configured to receive the high-voltage positive electrode HV1+ output by the high-voltage power supply module 50;
the input terminal 4 of the fourteenth detection sub-module 114, which is the input terminal FC22 of the detection module 10, is used for receiving the high voltage negative PC "output by the BMS, so as to control the signal state of the output terminal CV4 of the fourteenth detection sub-module 114;
the output end of the fourteenth detection sub-module 114, which is the output end CV4 of the detection module 10, is configured to provide the detection signal CV4 for the main control module, so that the main control module 20 determines the on-off state of the low-side contactor KL4 in the BMS charging circuit according to the signal state of the detection signal CV 4;
the fifteenth detection submodule 115 is configured to enable the main control module 20 to determine whether the BMS correctly controls on/off of a high-side contact KL3 and a low-side contact KL4 in the BMS charging circuit;
it should be noted that the fifteenth detection submodule 115 is also a hardware safety mechanism for the eleventh detection submodule 111 and the twelfth detection submodule 112, and the main control module 20 determines whether the signal states of the control signals VO3 and VO4 output by the BMS to the contactors KL3 and KL4 are correctly detected by judging the combined states of the output signals CV5, CV1 and CV2 of the three detection submodules;
in a specific implementation, the input end 2 of the fifteenth detection submodule 115, which is used as the input end 2 of the detection module 10, is connected to the output end VCO of the BMS, and receives the dc power supply VCO provided by the BMS;
an input terminal 3 of the fifteenth detection submodule 115, which is an input terminal FC11 of the detection module 10, is connected to the output terminal VO3 of the BMS, and is configured to receive the control signal VO3 output by the BMS, so as to control the signal status of the output terminal CV5 of the fifteenth detection submodule 115;
the input terminal 4 of the fifteenth detection submodule 115, which is the input terminal FC21 of the detection module 10, is connected to the output terminal VO4 of the BMS, and is configured to receive the control signal VO4 output by the BMS, so as to control the signal status of the output terminal CV5 of the fifteenth detection submodule 115;
the fifteenth detection submodule 115 serves as a hardware safety mechanism for synchronously detecting the signal states of the input terminals FC11 and FC21 of the detection module 10, and the signal state of the output terminal CV5 thereof follows the change of the signal states of the FC11 and FC 21.
The output end of the fifteenth detection sub-module 115, which is the output end CV5 of the detection module 10, is configured to provide the detection signal CV5 for the main control module 20, so that the main control module 20 determines whether the signal states of the control signals VO3 and VO4 of the high-side contact KL3 and the low-side contact KL4 output by the BMS are correctly detected according to the detection signal state combination for on-off control of the contacts formed by the detection signal CV5 and the detection signals CV1 and CV 2; meanwhile, whether to calculate the failure diagnosis time CT1 of the BMS in the charging mode is decided by the determination result of the combination of the states of the detection signals.
In the utility model, in a specific implementation, the signal state combination for on-off control of the contactor designed by the utility model is as follows:
1. CV5 is low, B2, when CV1 and CV2 are both low;
2. CV5 is high B1 when CV1 and CV2 are both high;
3. CV5 is low, a2, when CV1 is high and CV2 is low;
4. CV5 is high, a1, when CV1 is low and CV2 is high;
in the utility model, in a concrete implementation, the high level A1 > the high level B1 > the low level A2 > the low level B2, wherein the low level B2 is 0V, and the high level A1 is close to the power supply VDD.
In a specific implementation, the judgment result of the signal state combination includes a normal state and a fault state, if the signal state combination of CV5, CV1 and CV2 detected by the main control module 20 conforms to the above combination logic, the judgment result is normal, and the BMS fault diagnosis time CT1 is calculated;
if the signal state combination of CV5, CV1 and CV2 detected by the main control module 20 does not conform to the above combination logic, the result is determined to be a fault, the fault diagnosis time CT1 is not calculated, and the main control module 20 controls to disconnect the dc power outputs of the high-voltage power module 50 and the low-voltage power module 40 in the test system if the result of the redetection is still a fault.
That is, the main control module 20 calculates and obtains the fault diagnosis time CT1 of the BMS in the charging mode according to the detection signals CV5, CV1 and CV2 output from the detection module 10;
the sixteenth detection submodule 116 is configured to enable the main control module 20 to determine on-off states of a high-side contact KL3 and a low-side contact KL4 in the BMS charging loop;
it should be noted that the sixteenth detection sub-module 116 is also a hardware safety mechanism for the thirteenth detection sub-module 113 and the fourteenth detection sub-module 114, and the main control module 20 determines whether the on-off states of the high-side contactor KL3 and the low-side contactor KL4 are correctly detected by determining the combined states of the output signals CV6, CV3 and CV4 of the three detection sub-modules;
in a specific implementation, the input end 2 of the sixteenth detection submodule 116, which is used as the input end 4 of the detection module 10, is connected to the output end HV2+ of the high-voltage power supply module 50, and is configured to receive the positive high voltage HV2+ output by the high-voltage power supply module 50;
the input terminal 3 of the sixteenth detection submodule 116, which is the input terminal FC12 of the detection module 10, receives the high voltage PC + output from the BMS output terminal PC +, thereby controlling the signal state of the output terminal CV6 of the sixteenth detection submodule 116;
an input terminal 4 of the sixteenth detection sub-module 116, serving as an input terminal 5 of the detection module 10, is connected to the output terminal HV-of the high-voltage power supply module 50, and is configured to receive the negative high voltage HV-output by the high-voltage power supply module 50, so as to control a signal state of the output terminal CV6 of the sixteenth detection sub-module 116;
an input terminal 5 of the sixteenth detection sub-module 116, serving as an input terminal 3 of the detection module 10, is connected to the output terminal HV1+ of the high-voltage power supply module 50, and is configured to receive the positive high voltage HV1+ output by the high-voltage power supply module 50, so as to control the signal state of the output terminal CV6 of the sixteenth detection sub-module 116;
an input terminal 6 of the sixteenth detection submodule 116, serving as an input terminal FC22 of the detection module 10, receives the high voltage PC-output from the BMS output terminal PC-, thereby controlling the signal state of the output terminal CV6 of the sixteenth detection submodule 116;
the sixteenth detection submodule 116 serves as a hardware safety mechanism for synchronously detecting the signal states of the input terminals FC12 and FC22 of the detection module 10, and the signal state of the output terminal CV6 thereof changes along with the signal states of the FC12 and FC 22.
The output end of the sixteenth detection sub-module 116, which is the output end CV6 of the detection module 10, is configured to provide a detection signal CV6 for the main control module 20, so that the main control module 20 determines whether the on-off states of the high-side contact KL3 and the low-side contact KL4 are correctly detected according to a detection signal state combination of the detection signal CV6 and the detection signals CV3 and CV4 for contactor on-off control; meanwhile, it is decided whether to calculate the fault response time CT2 of the BMS in the charging mode according to the result of the judgment of the state combination of the detection signals.
In the utility model, the signal state combination of the on-off state of the contactor designed by the utility model specifically comprises the following steps:
1. CV6 is low, B2, when CV3 and CV4 are both low;
2. CV6 is high B1 when CV3 and CV4 are both high;
3. CV6 is low, a2, when CV3 is high and CV4 is low;
4. CV6 is high, a1, when CV3 is low and CV4 is high;
in the utility model, in specific implementation, high level a1 > high level B1 > low level a2 > low level B2, wherein low level B2 is 0V, and high level a1 is close to power supply VDD.
In the concrete implementation, the judgment result of the signal state combination comprises a normal state and a fault state;
wherein, if the signal state combination of CV6, CV3 and CV4 detected by the master control module 20 conforms to the above-mentioned combinational logic, the result is determined to be normal, and BMS fault response time CT2 is calculated;
if the signal state combination of CV6, CV3 and CV4 detected by the main control module 20 does not conform to the above-mentioned combinational logic, the determination result is a fault, the fault response time CT2 is not calculated, and the detection is performed again, and if the detection result is still a fault again, the main control module 20 will control to disconnect the dc power supply output of the high-voltage power supply module 50 and the low-power supply module 40 in the test system.
That is, the master control module 20 is configured to calculate and obtain the fault response time CT2 of the BMS in the charging mode according to the detection signals CV6, CV3 and CV4 output by the detection module 10.
In the present invention, referring to fig. 1, fig. 2, fig. 3 and fig. 4, for the BMS Fault Tolerance Time (FTTI) and the test sequence of the safety state in the discharging mode and the charging mode, the test sequence may be determined according to the actual test requirement, and the test step, the FTTI calculating method and the safety state judging method are specifically explained below by taking the test in the discharging mode as an example.
For the utility model, when the BMS is accessed into the test system of the utility model, the specific test steps are as follows:
step 1, a tester sends a test instruction to a main control module 20 through an upper computer module 60 through a communication terminal COM2, and the main control module 20 controls and outputs a low-voltage direct-current power supply to electrify a BMS;
step 2, the main control module 20 controls the low-side power supply module 40 to output dc power supplies VCC1 and VCC2 through a BUS communication port BUS, wherein the dc power supply VCC1 (e.g., 5V) powers up the BMS, and the dc power supply VCC2 (e.g., 12V/24V) provides dc power for coils of high-side contactors KL1 and KL3 and low-side contactors KL2 and KL 4;
step 3, after the BMS is powered on, outputting a direct current power supply VCO for the detection module 10 through the VCO at the output end; according to a preset test protocol, the BMS and the main control module 20 interact test messages through a communication terminal 7 and COM 1;
step 4, the main control module 20 controls the high-voltage power supply module 50 to output high voltages HV1 and HV2 through a BUS communication port BUS, wherein HV1 is used for simulating high voltage of a battery system, and HV2 is used for providing voltage and current of HV2 for the detection module 10;
step 5, after the BMS controls the high-side contactor KL1 and the low-side contactor KL2 in the BMS discharging loop to be closed, sending a high-voltage message to the main control module 20 through the communication terminal COM 1; when the detection module 10 detects that the input ends FD11 and FD21 of the detection module become high level, the output ends DV1 and DV2 of the detection module change from low level to high level, and the output ends DV5 and DV6 change to high level B1;
step 7, the main control module 20 controls the low-side power module 40 to output a fault simulation voltage VCC3 through a BUS communication terminal BUS, and records time t1 generated by the fault simulation voltage VCC3, for calculating BMS fault diagnosis time DT 1;
meanwhile, the detection module 10 detects the signal state changes of the input ends FD11, FD12, FD21 and FD22, and sends the signal state changes of the input ends FD11, FD12, FD21 and FD22 to the main control module 20 through the output ends DV1 to DV6, the main control module 20 judges whether the BMS enters a safe state within a preset Fault Tolerance Time (FTTI) by judging the signal states DV1 to DV6, and sends the test result to the upper computer module 60 through the communication end COM2, and the upper computer module 60 displays the test result at a specified position;
in the present invention, in a discharging mode, a method for calculating Fault Tolerance Time (FTTI) of the BMS is as follows:
when the BMS detects a fault analog voltage VCC3, first, a load closing request message is sent to the main control module 20 through the communication terminal COM1, after the main control module 20 receives the message, the time t2 of receiving the request message is recorded and the load closing message is sent to the BMS, t2 is used for calculating BMS fault diagnosis time DT1, wherein DT1 is equal to the time difference of subtracting t1 (the time generated by the fault analog voltage VCC 3) from t 2.
It should be noted that, for the present invention, if the fault analog voltage VCC3 is a cell overvoltage value, for example, if the normal value range of the cell voltage stored in the BMS and the main control module 20 is 3.0V to 4.2V, the overvoltage fault analog voltage VCC3 should be greater than 4.2V, and if the overvoltage fault analog voltage is set to 4.3V, the main control module 20 controls the voltage of the output terminal VCC3 of the low voltage power module 40 to be 4.3V. Similarly, for under-voltage, over-temperature, over-current and other faults, corresponding fault analog voltages can be set according to respective normal numerical value ranges, wherein the same output port can be used for the over-voltage and the under-voltage, and the respective independent output ports are needed for the over-temperature and the over-current analog voltages.
Secondly, after the BMS receives the closed load message, the BMS controls a high-side contactor KL1 in the BMS discharging loop to be turned off, so that the BMS output terminal VO1 is changed from high level to low level, that is, the input terminal FD11 of the detection module 10 is low level, correspondingly, as shown in fig. 3, the input terminal 3 of the first detection submodule 101 is low level, so that the output terminal of the first detection submodule 101 is low level, that is, the output terminal DV1 of the detection module 10 is low level, and the main control module 20 records the time t3 when the DV1 terminal is changed from high level to low level, and is used for calculating BMS fault response time DT 2; the high-side contact KL1 is turned off to change the output PD + of the BMS from the high voltage HV1 to 0V, i.e. the input FD12 of the detection module 10 is at a low level, correspondingly, as shown in fig. 3, the input 1 of the third detection submodule 103 is at a low level, i.e. the output DV3 of the detection module 10 is at a low level, and the main control module 20 records the time t4 when the DV3 changes from the high level to the low level, for calculating the time interval when the high-side contact KL1 and the low-side contact KL2 are turned off.
Finally, the BMS continuously controls the low-side contact KL2 in the BMS discharging loop to open, so that the BMS output terminal VO2 changes from high level to low level, that is, the input terminal FD21 of the detection module 10 is low level, correspondingly, as shown in fig. 3, the input terminal 3 of the second detection submodule 102 is low level, so that the output terminal of the second detection submodule 102 is low level, that is, the output terminal DV2 of the detection module 10 is low level, and the main control module 20 records the time t5 when the DV2 terminal changes from high level to low level, so as to calculate the time interval between the high-side contact KL1 and the low-side contact KL 2; the low side contact KL2 is turned off to disconnect the output PD-of the BMS from the input FD22 of the detection module 10, and the input FD22 of the detection module 10 is in a high impedance state, correspondingly, as shown in fig. 3, the input 2 of the fourth detection submodule 104 is in a high impedance state, and the output of the fourth detection submodule 104 is in a low level, i.e. the output DV4 of the detection module 10 is in a low level, and the main control module 20 records the time t6 when the DV4 changes from the high level to the low level, for calculating the BMS failure response time DT2, wherein DT2 is equal to the time difference between t5 and t 3.
In the utility model, the BMS safety state judging method specifically comprises the following steps:
when the BMS diagnoses a fault, the main control module 20 is configured to compare the detected actual fault tolerance time FTTI of the BMS with a predefined Fault Tolerance Time (FTTI), and if the actual Fault Tolerance Time (FTTI) of the BMS is greater than the predefined Fault Tolerance Time (FTTI), determine that the BMS does not enter a safe state within the predefined FTTI; and if the actual Fault Tolerance Time (FTTI) of the BMS is less than the specified Fault Tolerance Time (FTTI), judging that the BMS enters the safe state within the specified FTTI time.
It should be noted that, for the specified fault tolerance time FTTI, it should be stored in the main control module 20 in advance, and as mentioned above, it is used for comparing with the actual fault tolerance time FTTI.
It should be noted that when the BMS diagnoses a fault, it is necessary to respond to the fault, that is, to disconnect the contacts of the high-side contact KL1 or KL3 and the low-side contact KL2 or KL4 to physically disconnect the BMS from an external load or a charging device, thereby stopping the output or input of a high voltage, which is a safe state of the BMS.
In the present invention, the BMS configures two contactors, i.e., a high-side contactor KL1 and a low-side contactor KL2, in the BMS discharge circuit; in the discharging mode, when a fault occurs, only the contacts of the KL1 and the KL2 are disconnected, the BMS can be indicated to enter a safe state, otherwise, the BMS does not enter the safe state; according to the provisions of the national functional safety standard, it is required to enter a safe state within the confirmed fault tolerance time interval FTT 1.
It should be noted that the confirmed fault tolerance time interval FTTI should be a proof with sufficient and credible evidence: during the time interval from the occurrence of a fault to the entry of the BMS into a safe state, the battery system is unable to fail events that can cause injury to personnel; for example, when a battery overvoltage fault occurs, the BMS opens the contactors KL1, KL2 to a safe state before the battery is ignited and exploded, so as to reliably implement an overvoltage protection function, and this time interval is a fault tolerance interval FTTI. Generally, the shorter the FTTI, the safer; for example, if a battery overvoltage failure occurs for 30 seconds, which may cause fire or explosion, the FTTI of the BMS may be set to not more than 5 seconds, indicating that the overvoltage protection function of the BMS satisfies the functional safety requirement as long as the BMS enters a safe state within 5 seconds.
In the present invention, it should be noted that, in the specific implementation, the main control chip of the main control module 20 may adopt a currently commonly used single chip microcomputer of a brand, a series and a model, such as an MC9S12 series of NXP; the memory chip in the main control module 20 can be of the currently commonly used brand, series and model; the types of the main control chip and the memory chip are out of the protection scope of the utility model.
In the present invention, it should be noted that, in terms of specific implementation, the dc power module 30, the low voltage power module 40, and the high voltage power module 50 are all power circuits commonly used in the existing BMS technical solution, and technicians can easily obtain and apply the power circuits without innovation, wherein the low voltage power module 40 and the high voltage power module 50 should have a bus communication function, and the technical solutions of the power circuits are not in the technical solution of the present invention, and therefore, they are not specifically explained herein.
In the present invention, it should be noted that, in the specific implementation, the upper computer module 60 may be an outsourced or self-developed upper computer module, can support the input of parameters through a mouse and a keyboard, can exchange data with the main control module 20, and has an information display function, such as a visual interface or a display screen.
The detection module of the present invention may be formed of an existing integrated chip, or may be formed of a plurality of discrete devices, as long as it can output the detection signals DV1 to DV6 and the detection signals CV1 to CV6 to the main control module at the levels described above, and has a plurality of input terminals (as FD11, FD21, etc.), and can be connected to the BMS, the high voltage power supply module, and the low voltage power supply module. In particular, the detection module may adopt an existing ordinary circuit or functional module capable of performing multi-channel signal input and multi-channel level output (having two state signal outputs of high level and low level).
In summary, compared with the prior art, the test system for detecting the safety state of the battery management system provided by the utility model has the advantages that the design is scientific, the functional safety design principle is followed, the detection reliability is improved by introducing the hardware safety mechanism, the safety state detection of the BMS can be realized, and the test system has great production practice significance.
Meanwhile, the testing system can also realize the detection of the actual fault tolerance time interval FTTI of the BMS.
For the technical scheme of the utility model, the hardware circuit design is scientific, the electronic components are of common application models, the model selection is easy, and the components are low in price, so that the technical scheme of the utility model has very high practical value and market popularization value.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A test system for detecting the safety state of a battery management system is characterized by comprising a detection module (10), a main control module (20), a direct-current power supply module (30), a low-voltage power supply module (40), a high-voltage power supply module (50) and an upper computer module (60);
the input end 3 of the detection module (10) is connected with the high-voltage anode output end HV1+ of the high-voltage power supply module (50);
the input end 5 of the detection module (10) is connected with the high-voltage negative output end HV-of the high-voltage power supply module (50) and is used for receiving a direct-current high-voltage power supply HV1 provided by the high-voltage power supply module (50);
the input end 4 of the detection module (10) is connected with the high-voltage anode output end HV2+ of the high-voltage power supply module (50);
the input end 5 of the detection module (10) is connected with the high-voltage negative output end HV-of the high-voltage power supply module (50) and is used for receiving a direct-current high-voltage power supply HV2 provided by the high-voltage power supply module (50);
the input end FD11 of the detection module (10) is connected with the output end VO1 of the battery management system BMS and is used for receiving a control signal VO1 output by the BMS;
the input end FD21 of the detection module (10) is connected with the output end VO2 of the BMS and is used for receiving a control signal VO2 output by the BMS;
the input end FD12 of the detection module (10) is connected with the output end PD + of the BMS and is used for receiving the high voltage PD + output by the BMS;
the input end FD22 of the detection module (10) is connected with the output end PD-of the BMS and is used for receiving the high voltage PD-output by the BMS;
the input end FC11 of the detection module (10) is connected with the output end VO3 of the BMS and is used for receiving a control signal VO3 output by the BMS;
the input end FC21 of the detection module (10) is connected with the output end VO4 of the BMS and is used for receiving a control signal VO4 output by the BMS;
the input end FC12 of the detection module (10) is connected with the output end PC + of the BMS and is used for receiving the high voltage PC + output by the BMS;
the input end FD22 of the detection module (10) is connected with the output end PC-of the BMS and is used for receiving the high voltage PC-output by the BMS;
the input end 1 of the detection module (10) is connected with the output end VDD of the direct current power supply module (30) and is used for receiving a power supply VDD;
the input end 2 of the detection module (10) is connected with the output end VCO of the BMS and is used for receiving the DC power supply VCO output by the BMS as a test object;
the output end DV1 of the detection module (10) is connected with the input end 1 of the main control module (20) and is used for providing a detection signal DV1 for the main control module (20);
the output end DV2 of the detection module (10) is connected with the input end 2 of the main control module (20) and is used for providing a detection signal DV2 for the main control module (20);
the output end DV5 of the detection module (10) is connected with the input end 5 of the main control module (20) and is used for providing a detection signal DV5 for the main control module (20);
the output end DV3 of the detection module (10) is connected with the input end 3 of the main control module (20) and is used for providing a detection signal DV3 for the main control module (20);
the output end DV4 of the detection module (10) is connected with the input end 4 of the main control module (20) and is used for providing a detection signal DV4 for the main control module (20);
the output end DV6 of the detection module (10) is connected with the input end 6 of the main control module (20) and is used for providing a detection signal DV6 for the main control module (20);
the output end CV1 of the detection module (10) is connected with the input end 7 of the main control module (20) and is used for providing a detection signal CV1 for the main control module (20);
the output end CV2 of the detection module (10) is connected with the input end 8 of the main control module (20) and is used for providing a detection signal CV2 for the main control module (20);
the output end CV5 of the detection module (10) is connected with the input end 9 of the main control module (20) and is used for providing a detection signal CV5 for the main control module (20);
the output end CV3 of the detection module (10) is connected with the input end 10 of the main control module (20) and is used for providing a detection signal CV3 for the main control module (20);
the output end CV4 of the detection module (10) is connected with the input end 11 of the main control module (20) and is used for providing a detection signal CV4 for the main control module (20);
the output end CV6 of the detection module (10) is connected with the input end 12 of the main control module (20) and is used for providing a detection signal CV6 for the main control module (20);
the input end 1 of the main control module (20) is connected with the output end DV1 of the detection module (10) and is used for receiving a detection signal DV1 output by the detection module (10);
the input end 2 of the main control module (20) is connected with the output end DV2 of the detection module (10) and is used for receiving a detection signal DV2 output by the detection module (10);
the input end 3 of the main control module (20) is connected with the output end DV3 of the detection module (10) and is used for receiving a detection signal DV3 output by the detection module (10);
the input end 4 of the main control module (20) is connected with the output end DV4 of the detection module (10) and is used for receiving a detection signal DV4 output by the detection module (10);
the input end 5 of the main control module (20) is connected with the output end DV5 of the detection module (10) and is used for receiving a detection signal DV5 output by the detection module (10);
the input end 6 of the main control module (20) is connected with the output end DV6 of the detection module (10) and is used for receiving a detection signal DV 6;
the communication end COM1 of the main control module (20) is connected with the communication end 7 of the BMS and is used for exchanging data with the BMS;
the communication end COM2 of the main control module (20) is connected with the input end and the output end of the upper computer module (60) and is used for exchanging data with the upper computer module (60);
the BUS communication end BUS of the main control module (20) is respectively connected with the communication end of the low-voltage power supply module (40) and the communication end of the high-voltage power supply module (50) through buses and is used for controlling the power output of the low-voltage power supply module (40) and the high-voltage power supply module and the size of the output power supply.
2. The test system for testing the safety state of a battery management system according to claim 1, wherein the main control module (20) is configured to calculate a fault diagnosis time DT1 of the BMS in the discharging mode according to the test signals DV1, DV2, and DV5 output from the test module (10), and calculate a fault response time DT2 of the BMS in the discharging mode according to the test signals DV3, DV4, and DV6 output from the test module (10), then calculate an actual fault tolerance time interval FTTI of the BMS, finally compare the calculated fault tolerance time interval FTTI with a preset fault tolerance time interval FTTI of the BMS, and determine that the BMS does not enter the safety state if the actual FTTI is greater than the preset FTTI; if the actual FTTI is less than or equal to the preset FTTI, judging that the BMS enters a safe state;
wherein, the sum of the fault diagnosis time DT1 of the BMS and the fault response time DT2 of the BMS is equal to the actual fault tolerance time interval FTTI of the BMS.
3. The test system for testing the safety state of a battery management system according to claim 1 or 2, wherein the main control module (20) is configured to calculate a fault diagnosis time CT1 of the BMS in the charging mode according to the test signals CV5, CV1 and CV2 output by the test module (10), and calculate a fault response time CT2 of the BMS in the charging mode according to the test signals CV6, CV3 and CV4 output by the test module (10);
wherein, the sum of the fault diagnosis time CT1 of the BMS and the fault response time CT2 of the BMS is equal to the actual fault tolerance time interval FTTI of the BMS in the charging mode.
4. The testing system for detecting the safety status of a battery management system according to claim 1, wherein the input terminal 15 of the main control module (20) is connected to the output terminal VDD of the dc power supply module (30) for receiving the dc power supply VDD;
the output end VDD of the direct current power supply module (30) is respectively connected with the input end 15 of the main control module (20) and the input end 1 of the detection module and is used for providing a direct current power supply VDD for the detection module (10) and the main control module (20);
the communication end of the low-voltage power supply module (40) is connected with a BUS communication end BUS of the main control module (20) and is used for receiving the instruction output by the main control module (20) and exchanging data with the main control module (20);
the output end VCC1 of the low-voltage power supply module (40) is connected with the input end 3 of the BMS and is used for providing a direct-current working power supply for the BMS;
the output end VCC2 of the low-voltage power supply module (40) is connected with the input end 4 of the BMS and is used for providing working power for coils of high-side contacts KL1 and KL3 and low-side contacts KL2 and KL4 in the BMS;
the output end VCC3 of the low-voltage power supply module (40) is connected with the input end 5 of the BMS and is used for providing fault simulation voltage for the BMS;
the output end HV1+ of the high-voltage power supply module (50) is connected with the input end 1 of the BMS and is used for providing a direct-current high-voltage power supply HV1+ for simulating the high-voltage anode of a battery system in a discharging mode;
the output end HV1 of the high-voltage power supply module (50) is connected with the input end 2 of the BMS and is used for providing a direct-current high-voltage power supply HV1 for simulating the high-voltage negative pole of the battery system in a discharging mode and a charging mode;
the output terminal HV2+ of the high voltage power supply module (50) is connected to the input terminal 3 of the BMS for providing a dc high voltage power supply HV2+ to the BMS for simulating the high voltage positive pole of the battery system in the charging mode.
5. The test system for detecting the safety status of a battery management system according to any one of claims 1 to 4, characterized in that the detection module (10), in particular comprising a first detection module combination (10A);
the first detection module combination (10A) comprises a first detection submodule (101), a second detection submodule (102), a third detection submodule (103), a fourth detection submodule (104), a fifth detection submodule (105) and a sixth detection submodule (106), and the six detection submodules are used for detecting the on-off of a high-side contactor KL1 and a low-side contactor KL2 in a BMS discharge circuit.
6. The test system for testing the safety status of a battery management system according to claim 5, wherein the input terminals 1 of the first to fifth test submodules (101) to 105) are connected to the output terminal VDD of the DC power module (30) for receiving the DC power VDD;
the first detection submodule (101) is used for detecting a control signal VO1 which is output by the BMS and used for controlling the on-off of a high-side contactor KL1 in a BMS discharging loop;
the input end 2 of the first detection submodule (101) is used as the input end 2 of the detection submodule (10), is connected with the output end VCO of the BMS and is used for receiving the DC power supply VCO provided by the BMS;
the input end 3 of the first detection submodule (101), which is used as the input end FD11 of the detection module (10), is connected with the output end VO1 of the BMS and is used for receiving a control signal VO1 output by the BMS;
the output end of the first detection submodule (101) is used as the output end DV1 of the detection module (10) and is used for providing a detection signal DV1 for the main control module;
the second detection submodule (102) is used for detecting a control signal VO2 which is output by the BMS and used for controlling the on-off of the low-side contactor KL2 in the BMS discharge loop;
the input end 2 of the second detection submodule (102) is used as the input end 2 of the detection submodule (10), is connected with the output end VCO of the BMS and is used for receiving the DC power supply VCO provided by the BMS;
the input end 3 of the second detection submodule (102), which is used as the input end FD21 of the detection module (10), is connected with the output end VO2 of the BMS and is used for receiving a control signal VO2 output by the BMS;
the output end of the second detection submodule (102), which is the output end DV2 of the detection module (10), is used for providing the detection signal DV2 for the main control module (20).
7. The testing system for detecting the safety state of the battery management system according to claim 5, characterized by a third detection submodule (103) for detecting the on-off of a high side contactor KL1 in a BMS discharge circuit;
the input end 2 of the third detection submodule (103) is used as the input end 4 of the detection module (10), is connected with the output end HV2+ of the high-voltage power supply module (50), and is used for receiving the positive high voltage HV2+ output by the high-voltage power supply module (50);
the input end 3 of the third detection submodule (103) is used as the input end FD12 of the detection module (10) and is used for receiving the high voltage PD + output by the BMS output end PD +, so that the output end DV3 of the third detection submodule (103) is controlled;
the input end 4 of the third detection submodule (103) is used as the input end 5 of the detection module (10), is connected with the output end HV < - > of the high-voltage power supply module (50), and is used for receiving the negative high voltage HV < - > output by the high-voltage power supply module (50);
an output end DV3 of the third detection submodule (103) is used as an output end DV3 of the detection module (10) and is used for providing a detection signal DV3 for the main control module (20);
the fourth detection submodule (104) is used for detecting the on-off of the low-side contactor KL2 in the BMS discharge circuit;
an input end 2 of the fourth detection submodule (104), which is used as an input end 4 of the detection module (10), is connected with an output end HV2+ of the high-voltage power supply module (50) and is used for receiving the positive high voltage HV2+ output by the high-voltage power supply module (50);
the input end 3 of the fourth detection submodule (104), which is used as the input end 3 of the detection module (10), is connected with the output end HV1+ of the high-voltage power supply module (50) and is used for receiving a high-voltage positive electrode HV1+ output by the high-voltage power supply module (50);
the input end 4 of the fourth detection submodule (104) is used as the input end FD22 of the detection module (10) and is used for receiving the high-voltage negative electrode PD-output by the BMS;
the output end of the fourth detection submodule (104) is used as the output end DV4 of the detection module (10) and is used for providing a detection signal DV4 for the main control module (20);
the input end 2 of the fifth detection submodule (105), which is used as the input end 2 of the detection module (10), is connected with the output end VCO of the BMS and is used for receiving the DC power supply VCO provided by the BMS;
the input end 3 of the fifth detection submodule (105), which is used as the input end FD11 of the detection module (10), is connected with the output end VO1 of the BMS and is used for receiving a control signal VO1 output by the BMS;
the input terminal 4 of the fifth testing submodule (105), which is the input terminal FD21 of the testing submodule (10), is connected to the output terminal VO2 of the BMS for receiving the control signal VO2 outputted by the BMS
The output end of the fifth detection submodule (105) is used as the output end DV5 of the detection module (10) and is used for providing a detection signal DV5 for the main control module (20);
the sixth detection submodule (106) is used for enabling the main control module (20) to judge the on-off states of a high-side contact KL1 and a low-side contact KL2 in the BMS discharge circuit;
an input end 2 of the sixth detection submodule (106), which is used as an input end 4 of the detection module (10), is connected with an output end HV2+ of the high-voltage power supply module (50) and is used for receiving the positive high voltage HV2+ output by the high-voltage power supply module (50);
the input end 3 of the sixth detection submodule (106) is used as the input end FD12 of the detection module (10) and receives the high voltage PD + output by the BMS output end PD +;
the input end 4 of the sixth detection submodule (106), which is used as the input end 5 of the detection module (10), is connected with the output end HV < - > of the high-voltage power supply module (50) and is used for receiving the negative high voltage HV < - > output by the high-voltage power supply module (50);
the input end 5 of the sixth detection submodule (106), which is used as the input end 3 of the detection module (10), is connected with the output end HV1+ of the high-voltage power supply module (50) and is used for receiving the positive high voltage HV1+ output by the high-voltage power supply module (50);
the input end 6 of the sixth detection submodule (106) is used as the input end FD22 of the detection module (10) and receives the high voltage PD-output by the BMS output end PD-;
the output end of the sixth detection submodule (106) is used as the output end DV6 of the detection module (10) and is used for providing a detection signal DV6 for the main control module.
8. A test system for detecting the safety status of a battery management system according to any one of claims 1 to 4, characterized in that the detection module (10) comprises a second detection module group (10B);
and the second detection module combination (10B) specifically comprises an eleventh detection submodule (111), a twelfth detection submodule (112), a thirteenth detection submodule (113), a fourteenth detection submodule (114), a fifteenth detection submodule (115) and a sixteenth detection submodule (116), and the six detection submodules are used for detecting the on-off of the high-side contactor KL3 and the low-side contactor KL4 in the BMS charging circuit.
9. The test system for testing the safety status of a battery management system according to claim 8, wherein the input terminal 1 of the eleventh to sixteenth detection submodules (111) to (116) is connected to the output terminal VDD of the dc power module (30) for receiving the dc power VDD;
the eleventh detection submodule (111) is used for detecting a control signal VO3 which is output by the BMS and used for controlling the on-off of the high-side contactor KL3 in the BMS charging loop;
the input end 2 of the eleventh detection submodule (111), which is used as the input end 2 of the detection submodule (10), is connected with the output end VCO of the BMS and is used for receiving the DC power supply VCO provided by the BMS;
the input end 3 of the eleventh detection submodule (111), which is used as the input end FC11 of the detection module (10), is connected with the output end VO1 of the BMS and is used for receiving the control signal VO3 output by the BMS;
the output end of the eleventh detection submodule (111) is used as the output end CV1 of the detection module (10) and is used for providing a detection signal CV1 for the main control module;
the twelfth detection submodule (112) is used for detecting a control signal VO4 which is output by the BMS and used for controlling the on-off of the low-side contactor KL4 in the BMS charging loop;
the input end 2 of the twelfth detection submodule (112) is used as the input end 2 of the detection module (10), is connected with the output end VCO of the BMS and is used for receiving the DC power supply VCO provided by the BMS;
an input terminal 3 of the twelfth sensing submodule (112), serving as an input terminal FC21 of the sensing submodule (10), is connected to an output terminal VO4 of the BMS, and is used for receiving a control signal VO4 output by the BMS
The output end of the twelfth detection submodule (112) is used as the output end CV2 of the detection module (10) and is used for providing a detection signal CV2 for the main control module;
the thirteenth detection submodule (113) is used for detecting the on-off of a high-side contactor KL3 in the BMS charging loop;
an input end 2 of the thirteenth detection submodule (113), which is used as an input end 4 of the detection module (10), is connected with an output end HV2+ of the high-voltage power supply module (50) and is used for receiving the positive high voltage HV2+ output by the high-voltage power supply module (50);
the input end 3 of the thirteenth detection submodule (113) is used as the input end FC12 of the detection module (10) and is used for receiving the high voltage PC + output by the BMS output end PC +;
the input end 4 of the thirteenth detection submodule (113) is used as the input end 5 of the detection module (10), is connected with the output end HV < - > of the high-voltage power supply module (50), and is used for receiving the negative high voltage HV < - > output by the high-voltage power supply module (50);
an output end CV3 of the thirteenth detection submodule (113) is used as an output end CV3 of the detection module (10) and is used for providing a detection signal CV3 for the main control module;
the fourteenth detection submodule (114) is used for detecting the on-off of the low-side contactor KL4 in the BMS charging circuit;
an input end 2 of the fourteenth detection submodule (114), which is used as an input end 4 of the detection module (10), is connected with an output end HV2+ of the high-voltage power supply module (50), and is used for receiving the positive high voltage HV2+ output by the high-voltage power supply module (50);
the input end 3 of the fourteenth detection submodule (114), which is used as the input end 3 of the detection module (10), is connected with the output end HV1+ of the high-voltage power supply module (50) and is used for receiving a high-voltage positive electrode HV1+ output by the high-voltage power supply module (50);
the output end of the twelfth detection submodule (112) is used as the output end CV2 of the detection module (10) and is used for providing a detection signal CV2 for the main control module;
the thirteenth detection submodule (113) is used for detecting the on-off of a high-side contactor KL3 in the BMS charging loop;
an input end 2 of the thirteenth detection submodule (113), which is used as an input end 4 of the detection module (10), is connected with an output end HV2+ of the high-voltage power supply module (50) and is used for receiving the positive high voltage HV2+ output by the high-voltage power supply module (50);
the input end 3 of the thirteenth detection submodule (113) is used as the input end FC12 of the detection module (10) and is used for receiving the high voltage PC + output by the BMS output end PC +;
the input end 4 of the thirteenth detection submodule (113) is used as the input end 5 of the detection module (10), is connected with the output end HV < - > of the high-voltage power supply module (50), and is used for receiving the negative high voltage HV < - > output by the high-voltage power supply module (50);
the output end CV3 of the thirteenth detection submodule (113) is used as the output end CV3 of the detection module (10) and is used for providing the detection signal CV3 for the master control module.
10. The testing system for detecting the safety status of a battery management system according to claim 8, characterized by a fourteenth detection submodule (114) for detecting the on/off of the low side contactor KL4 in the BMS charging loop;
the input end 2 of the fourteenth detection submodule (114), which is used as the input end 4 of the detection module (10), is connected with the output end HV2+ of the high-voltage power supply module (50) and is used for receiving the positive high voltage HV2+ output by the high-voltage power supply module (50);
the input end 3 of the fourteenth detection submodule (114), which is used as the input end 3 of the detection module (10), is connected with the output end HV1+ of the high-voltage power supply module (50) and is used for receiving a high-voltage positive electrode HV1+ output by the high-voltage power supply module (50);
the input end 4 of the fourteenth detection submodule (114) is used as the input end FC22 of the detection module (10) and is used for receiving the high-voltage negative pole PC-output by the BMS;
the output end of the fourteenth detection submodule (114) is used as the output end CV4 of the detection module (10) and is used for providing a detection signal CV4 for the main control module;
the input end 2 of the fifteenth detection submodule (115) is used as the input end 2 of the detection module (10), is connected with the output end VCO of the BMS, and receives the DC power supply VCO provided by the BMS;
the input end 3 of the fifteenth detection submodule (115), which is used as the input end FC11 of the detection module (10), is connected with the output end VO3 of the BMS and is used for receiving a control signal VO3 output by the BMS;
the input end 4 of the fifteenth detection submodule (115), which is used as the input end FC21 of the detection module (10), is connected with the output end VO4 of the BMS and is used for receiving a control signal VO4 output by the BMS;
the output end of the fifteenth detection submodule (115) is used as the output end CV5 of the detection module (10) and is used for providing a detection signal CV5 for the main control module (20);
the input end 2 of the sixteenth detection submodule (116), which is used as the input end 4 of the detection module (10), is connected with the output end HV2+ of the high-voltage power supply module (50) and is used for receiving the positive high voltage HV2+ output by the high-voltage power supply module (50);
the input end 3 of the sixteenth detection submodule (116), which is used as the input end FC12 of the detection module (10), receives the high voltage PC + output by the BMS output end PC +;
the input end 4 of the sixteenth detection submodule (116), which is used as the input end 5 of the detection module (10), is connected with the output end HV < - > of the high-voltage power supply module (50) and is used for receiving the negative high voltage HV < - > output by the high-voltage power supply module (50);
the input end 5 of the sixteenth detection submodule (116), which is used as the input end 3 of the detection module (10), is connected with the output end HV1+ of the high-voltage power supply module (50) and is used for receiving the positive high voltage HV1+ output by the high-voltage power supply module (50);
the input end 6 of the sixteenth detection submodule (116), which is used as the input end FC22 of the detection module (10), receives the high voltage PC output by the BMS output end PC-;
the output end of the sixteenth detection submodule (116), which is used as the output end CV6 of the detection module (10), is used for providing a detection signal CV6 for the main control module (20).
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