A new energy automobile battery electric change detection system

Abstract

The application discloses a new energy automobile battery electric change detection system, and relates to the technical field of battery detection.The new energy automobile battery electric change detection system comprises a charging and discharging module, a first battery module and a second battery module, a differential pressure detection module, a switching control module, a sampling switching module and an intelligent control module.The charging and discharging module is used for charging and discharging; the first battery module and the second battery module are both used for energy storage and discharging; the differential pressure detection module is used for differential pressure calculation, signal amplification, comparison of the amplified signal with a set reference threshold voltage; the switching control module is used for logic calculation and control of the signal transmission path of the sampling switching module during self-discharge detection; the sampling switching module is used for voltage division sampling and control of signal transmission; the change degree detection module is used for battery voltage change rate detection and battery abnormality judgment; and the intelligent control module is used for signal reception and module control.The new energy automobile battery electric change detection system can automatically select a voltage change rate detection object according to the voltage states of the first battery module and the second battery module, reduces detection workload, and improves the detection efficiency of battery electric change.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery detection, and particularly relates to a new energy automobile battery electric change detection system. BACKGROUND

[0002] In order to reduce carbon emissions and reduce the consumption of fossil energy, new energy vehicles are continuously developed. As one of the core key components of new energy vehicles, the performance state of a battery pack is directly related to the safety and endurance of a vehicle. The new energy automobile battery in the prior art is generally composed of multiple single batteries. In order to detect the electric energy state of the new energy automobile battery at all times, each group of single batteries in the new energy automobile battery is individually subjected to voltage detection, which results in the need for more high-precision voltage sampling devices and the cooperation of a central controller to determine the degree of battery electric quantity change. This not only increases the circuit cost, but also increases the detection workload of the central controller. In addition, when the new energy automobile battery does not perform charging and discharging work, the new energy automobile battery performs self-discharge work. The self-discharge of each group of single batteries is detected at all times, which further increases the detection workload of the central controller. Therefore, there is room for improvement. SUMMARY

[0003] The present application provides a new energy automobile battery electric change detection system to solve the problems in the background art.

[0004] According to the present application, a new energy automobile battery electric change detection system is provided, which comprises a charging and discharging module, a first battery module, a second battery module, a differential pressure detection module, a switching control module, a sampling switching module, a change degree detection module and an intelligent control module.

[0005] The charging and discharging module is connected with the intelligent control module and the first battery module, and is used for transmitting the accessed direct current electric energy to the first battery module when receiving the charging signal output by the intelligent control module, and receiving the third electric energy provided by the first battery module when receiving the discharging signal output by the intelligent control module.

[0006] The first battery module is connected with the second battery module, and is used for receiving and storing direct current electric energy and outputting first electric energy, superimposing the released electric energy and the second electric energy provided by the second battery module, and providing third electric energy.

[0007] The second battery module is used for receiving and storing the first electric energy and providing the second electric energy.

[0008] The differential pressure detection module is connected with the first battery module and the second battery module, and is configured to set a reference threshold, perform voltage difference calculation and signal amplification processing on the voltage average of the first battery module and the second battery module and the second electric energy, output a first difference signal, output a first control signal when the first difference signal is greater than the reference threshold, and output a second control signal when the first difference signal is less than the reference threshold;

[0009] The switching control module is connected with the differential pressure detection module and the intelligent control module, and is configured to output a first switching signal when the first control signal is not received and the intelligent control module does not output the charging signal or the discharging signal, and output a second switching signal when the second control signal is not received and the intelligent control module does not output the charging signal or the discharging signal.

[0010] The sampling switching module is connected with the first battery module, the second battery module, the intelligent control module, the switching control module and the change degree detection module, and is configured to perform voltage division sampling on the electric energy released by the first battery module and output a first sampling signal, perform voltage division sampling on the second electric energy and output a second sampling signal, transmit the second sampling signal to the change degree detection module when the first switching signal or a third control signal output by the intelligent control module is received, and transmit the first sampling signal to the change degree detection module when the second switching signal or a fourth control signal output by the intelligent control module is received.

[0011] The change degree detection module is connected with the intelligent control module, and is configured to set a voltage threshold, sample the input first sampling signal or second sampling signal, perform holding processing on the sampled signal and output a first detection signal when a timing signal output by the intelligent control module is received, perform subtraction processing on the first detection signal and the input first sampling signal or second sampling signal and output a second difference signal, output a first abnormal signal when the second difference signal is greater than the voltage threshold, and perform subtraction processing on the first sampling signal or the second sampling signal and the first detection signal and output a third difference signal when the charging signal output by the intelligent control module is received.

[0012] The intelligent control module is connected with the differential pressure detection module, and is configured to receive the first control signal and the second control signal, output the third control signal, the fourth control signal, the charging signal and the discharging signal, output the timing signal in a timely manner when battery self-discharge voltage change detection or charge-discharge voltage change detection is needed, judge new energy automobile battery abnormality when the first abnormal signal is received, and calculate the battery voltage change rate when the third difference signal or the second difference signal is received.

[0013] As a further scheme of the present application: the charge-discharge module comprises an electric energy port, a first power tube and a second power tube; the intelligent control module comprises a first controller; the first battery module comprises a first battery interface; the second battery module comprises a second battery interface;

[0014] Preferably, the first end of the electric energy port is connected to the drain of the second power tube, the source of the second power tube is connected to the source of the first power tube, the drain of the first power tube is connected to the first end of the first battery interface, the second end of the first battery interface is connected to the first end of the second battery interface, the second end of the second battery interface is connected to the second end of the electric energy port, and the gate of the first power tube and the gate of the second power tube are respectively connected to the IO1 end and the IO2 end of the first controller.

[0015] As a further scheme of the present application: the differential pressure detection module comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first operational amplifier, a second operational amplifier, a third operational amplifier and a twelfth resistor;

[0016] Preferably, one end of the fifth resistor is connected to the first end of the first battery interface, the other end of the fifth resistor is connected to the non-inverting terminal of the first operational amplifier and the second end of the second battery interface through the sixth resistor, the inverting terminal of the first operational amplifier is connected to one end of the eighth resistor and one end of the ninth resistor and the inverting terminal of the second operational amplifier through the seventh resistor, the other end of the eighth resistor is connected to the output terminal of the first operational amplifier and the non-inverting terminal of the third operational amplifier through the tenth resistor, the inverting terminal of the third operational amplifier is connected to one end of the twelfth resistor and the other end of the ninth resistor and the output terminal of the second operational amplifier through the eleventh resistor, the non-inverting terminal of the second operational amplifier is connected to the first end of the second battery interface, and the output terminal of the third operational amplifier is connected to the other end of the twelfth resistor.

[0017] As a further scheme of the present application: the differential pressure detection module further comprises a fourth operational amplifier, a thirteenth resistor, a first power supply, a fourteenth resistor, a fifteenth resistor, a first comparator and a second comparator;

[0018] Preferably, the output terminal of the fourth operational amplifier is connected to the inverting terminal of the fourth operational amplifier and one end of the third operational amplifier through the thirteenth resistor, the non-inverting terminal of the fourth operational amplifier is connected to one end of the fifteenth resistor, the non-inverting terminal of the first comparator and the inverting terminal of the second comparator and the first power supply through the fourteenth resistor, the other end of the fifteenth resistor is grounded, the inverting terminal of the first comparator is connected to the non-inverting terminal of the second comparator and the output terminal of the third operational amplifier, and the output terminal of the first comparator and the output terminal of the second comparator are respectively connected to the IO5 end and the IO6 end of the first controller.

[0019] As a further scheme of the present application: the sampling switching module comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first analog switch;

[0020] Preferably, the third end of the first analog switch is connected to one end of the second resistor and the first end of the first battery interface through the first resistor, the other end of the second resistor is connected to the first end of the second battery interface and one end of the fourth resistor through the third resistor and the eighth end of the first analog switch, the other end of the fourth resistor is connected to the second end of the second battery interface, the fourth end of the first analog switch is connected to the ninth end of the first analog switch and the change degree detection module, and the fifth end and the sixth end of the first analog switch are connected to the IO7 end and the IO8 end of the first controller respectively.

[0021] As a further scheme of the present application, the switching control module comprises a first inverter, a second inverter, a first logic chip, a second logic chip and a third logic chip.

[0022] Preferably, the input end of the first inverter and the input end of the second inverter are connected to the output end of the first comparator and the output end of the second comparator respectively, the output end of the first inverter and the output end of the second inverter are connected to the A end of the second logic chip and the B end of the third logic chip respectively, the B end of the second logic chip is connected to the A end of the third logic chip and the Y end of the first logic chip, the A end and the B end of the first logic chip are connected to the IO1 end and the IO2 end of the first controller respectively, and the Y end of the second logic chip and the Y end of the third logic chip are connected to the sixth end and the fifth end of the first analog switch respectively.

[0023] As a further scheme of the present application, the change degree detection module comprises a sample and hold device, a third inverter, a second analog switch, a seventeenth resistor, a first switch tube, a subtraction device, a first potentiometer, a first diode and a sixteenth resistor.

[0024] Preferably, the input end of the sample and hold device is connected to the fourth end of the first analog switch, the eighth end and the tenth end of the second analog switch, the output end of the sample and hold device is connected to the output end of the third inverter, the input end of the third inverter is connected to the IO3 end of the first controller and the collector of the first switch tube through the seventeenth resistor, the fourth end and the fifth end of the second analog switch, the third end and the first end of the second analog switch are both connected to the output end of the sample and hold device, the fourth end and the eleventh end of the second analog switch are both connected to the first input end of the subtraction device, the ninth end and the second end of the second analog switch are both connected to the second input end of the subtraction device, the output end of the subtraction device is connected to the IO9 end of the first controller and the wiper end of the first potentiometer and connected to the cathode of the first diode through the first potentiometer, the anode of the first diode is connected to the IO4 end of the first controller and grounded through the sixteenth resistor, the base of the first switch tube is connected to the IO2 end of the first controller, the twelfth end and the thirteenth end of the second analog switch, and the emitter of the first switch tube is grounded.

[0025] Compared with the prior art, the new energy automobile battery electric change detection system has the beneficial effects that: the new energy automobile battery electric change detection system detects whether the first battery module and the second battery module are voltage balanced by the differential pressure detection module, and obtains the voltage of the first battery module and the second battery module, when the first battery module and the second battery module are not voltage balanced and the charging and discharging module is not in the charging and discharging control, the sampling switching module is controlled by the switching control module to sample the voltage of the first battery module or the second battery module with lower voltage, the battery voltage change rate is detected by the change degree detection module, and when the voltage change rate exceeds the set voltage threshold, it is indicated that the battery self-discharge is abnormal, and the detection efficiency of the battery electric change is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 A principle block diagram of a new energy automobile battery electric change detection system provided by the embodiments of the present application.

[0028] Figure 2 A circuit diagram of a new energy automobile battery electric change detection system provided by the embodiments of the present application.

[0029] Figure 3 A circuit diagram of a switching control module provided by the embodiments of the present application.

[0030] Figure 4 A circuit diagram of a change degree detection module provided by the embodiments of the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] In one embodiment, please refer to Figure 1The application discloses a new energy automobile battery change detection system, which comprises a charging and discharging module 1, a first battery module 2, a second battery module 3, a differential pressure detection module 4, a switching control module 5, a sampling switching module 6, a change degree detection module 7 and an intelligent control module 8.

[0033] Specifically, the charging and discharging module 1 is connected with the intelligent control module 8 and the first battery module 2, and is used for transmitting the accessed direct-current electric energy to the first battery module 2 when receiving the charging signal output by the intelligent control module 8, and receiving the third electric energy provided by the first battery module 2 when receiving the discharging signal output by the intelligent control module 8.

[0034] The first battery module 2 is connected with the second battery module 3, and is used for receiving and storing direct-current electric energy and outputting first electric energy, superimposing the released electric energy and the second electric energy provided by the second battery module 3 and providing third electric energy.

[0035] The second battery module 3 is used for receiving and storing the first electric energy and providing the second electric energy.

[0036] The differential pressure detection module 4 is connected with the first battery module 2 and the second battery module 3, and is used for setting a reference threshold value, performing voltage difference calculation and signal amplification processing on the voltage average value of the first battery module 2 and the second battery module 3 and the second electric energy, outputting a first difference signal, outputting a first control signal when the first difference signal is greater than the reference threshold value, and outputting a second control signal when the first difference signal is less than the reference threshold value.

[0037] The switching control module 5 is connected with the differential pressure detection module 4 and the intelligent control module 8, and is used for outputting a first switching signal when the first control signal is not received and the intelligent control module 8 does not output the charging signal or the discharging signal, and outputting a second switching signal when the second control signal is not received and the intelligent control module 8 does not output the charging signal or the discharging signal.

[0038] The sampling switching module 6 is connected with the first battery module 2, the second battery module 3, the intelligent control module 8, the switching control module 5 and the change degree detection module 7, and is used for performing voltage division sampling on the electric energy released by the first battery module 2 and outputting a first sampling signal, performing voltage division sampling on the second electric energy and outputting a second sampling signal, transmitting the second sampling signal to the change degree detection module 7 when the first switching signal or the third control signal output by the intelligent control module 8 is received, and transmitting the first sampling signal to the change degree detection module 7 when the second switching signal or the fourth control signal output by the intelligent control module 8 is received.

[0039] The change degree detection module 7 is connected with the intelligent control module 8, is used for setting a voltage threshold, sampling the input first sampling signal or second sampling signal, performing holding processing on the sampled signal and outputting a first detection signal when receiving a timing signal output by the intelligent control module 8, performing subtraction processing on the first detection signal and the input first sampling signal or second sampling signal and outputting a second difference signal, outputting a first abnormal signal when the second difference signal is greater than the voltage threshold, performing subtraction processing on the first sampling signal or second sampling signal and the first detection signal and outputting a third difference signal when receiving a charging signal output by the intelligent control module 8;

[0040] The intelligent control module 8 is connected with the differential pressure detection module 4, is used for receiving the first control signal and the second control signal, outputting a third control signal, a fourth control signal, a charging signal and a discharging signal, timing outputting a timing signal when battery self-discharge voltage change detection or charge-discharge voltage change detection is needed, judging new energy automobile battery abnormality when receiving the first abnormal signal, and calculating a battery voltage change rate when receiving the third difference signal or the second difference signal.

[0041] In specific embodiments, the above-mentioned charge and discharge module 1 can adopt a charge and discharge circuit composed of field effect tubes and power ports to control the transmission direction of electric energy, perform charge and discharge control, and receive and access electric energy through the power ports; the above-mentioned first battery module 2 can adopt a first battery circuit composed of first battery interfaces to connect with a first battery pack to store energy and discharge; the above-mentioned second battery module 3 can adopt a second battery circuit composed of second battery interfaces to connect with a second battery pack to store energy and discharge, and be connected in series with the first energy storage module; the above-mentioned differential pressure detection module 4 can adopt a differential pressure detection circuit composed of resistors, operational amplifiers, comparators, etc. to set a reference threshold, detect the voltage average of the first battery module 2 and the second battery module 3 connected in series, and perform voltage amplification and difference calculation on the voltage average and the voltage of the second battery module 3, cooperate with the provided reference threshold to output a first difference signal, and then compare the voltage size relationship between the first difference signal and the reference threshold to determine whether the first battery module 2 and the second battery module 3 are voltage balanced; the above-mentioned switching control module 5 can adopt a switching control circuit composed of inverters and logic chips to control the signal transmission path of the sampling switching module 6 according to the signal state output by the differential pressure detection module 4 when no charge and discharge work is performed; the above-mentioned sampling switching module 6 can adopt a sampling switching circuit composed of resistors and analog switches to sample the voltage division of the first battery module 2 and the second battery module 3, and select the signal transmission, which transmits the sampled signal of the first battery module 2 or the sampled signal of the second battery module 3 to the change degree detection module 7; the above-mentioned change degree detection module 7 can adopt a change degree detection circuit composed of sample-and-hold devices, resistors, analog switches, subtraction devices, etc. to sample and process the input signal, and perform holding work when battery voltage change rate detection is needed, subtract the held signal from the real-time sampled signal, and output a first abnormal signal when the signal obtained by subtraction is greater than a set voltage threshold, while obtaining the first difference signal and the second difference signal in the charge and discharge state, cooperating with the timing time set by the intelligent control module 8 to obtain the voltage change rate; the above-mentioned intelligent control module 8 can adopt an intelligent control circuit composed of single-chip microcomputers and clock chips, which integrates many components such as calculators, controllers, memories, and input and output devices to realize signal processing, data storage, module control, timing control, and other functions.

[0042] In another embodiment, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the charge and discharge module 1 includes power ports, first power tube Q1 and second power tube Q2; the intelligent control module 8 includes a first controller U1; the first battery module 2 includes first battery interfaces; the second battery module 3 includes second battery interfaces;

[0043] Specifically, the first end of the electric energy port is connected to the drain of the second power tube Q2, the source of the second power tube Q2 is connected to the source of the first power tube Q1, the drain of the first power tube Q1 is connected to the first end of the first battery interface, the second end of the first battery interface is connected to the first end of the second battery interface, the second end of the second battery interface is connected to the second end of the electric energy port, and the gate of the first power tube Q1 and the gate of the second power tube Q2 are respectively connected to the IO1 end and the IO2 end of the first controller U1.

[0044] In specific embodiments, the first power tube Q1 and the second power tube Q2 can be N-channel field effect tubes, the first power tube Q1 is used for discharge control, and the second power tube Q2 is used for charge control; the electric energy port is used as an electric energy input or output port; the first controller U1 can be composed of an STM32 single-chip microcomputer and a clock chip; the first battery interface is connected to a group of batteries or multiple groups of batteries of a new energy vehicle battery, and the second battery interface is connected to an adjacent group of batteries or multiple groups of batteries of the new energy vehicle battery connected by the first battery interface.

[0045] Further, the differential pressure detection module 4 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first operational amplifier OP1, a second operational amplifier OP2, a third operational amplifier OP3, and a twelfth resistor R12.

[0046] Specifically, one end of the fifth resistor R5 is connected to the first end of the first battery interface, the other end of the fifth resistor R5 is connected to the non-inverting terminal of the first operational amplifier OP1 and the second end of the second battery interface through the sixth resistor R6, the inverting terminal of the first operational amplifier OP1 is connected to one end of the eighth resistor R8 and one end of the ninth resistor R9 and the inverting terminal of the second operational amplifier OP2 through the seventh resistor R7, the other end of the eighth resistor R8 is connected to the output terminal of the first operational amplifier OP1 and the non-inverting terminal of the third operational amplifier OP3 through the tenth resistor R10, the inverting terminal of the third operational amplifier OP3 is connected to one end of the twelfth resistor R12 and the other end of the ninth resistor R9 and the output terminal of the second operational amplifier OP2 through the eleventh resistor R11, the non-inverting terminal of the second operational amplifier OP2 is connected to the first end of the second battery interface, and the output terminal of the third operational amplifier OP3 is connected to the other end of the twelfth resistor R12.

[0047] In specific embodiments, the first operational amplifier OP1, the second operational amplifier OP2, and the third operational amplifier OP3 can be OP07 operational amplifiers, which are used for voltage average value sampling and voltage difference value calculation in cooperation with the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12.

[0048] Further, the differential pressure detection module 4 further comprises a fourth operational amplifier OP4, a thirteenth resistor R13, a first power supply VCC1, a fourteenth resistor R14, a fifteenth resistor R15, a first comparator A1 and a second comparator A2.

[0049] Specifically, an output terminal of the fourth operational amplifier OP4 is connected to an inverting terminal of the fourth operational amplifier OP4 and a non-inverting terminal of the third operational amplifier OP3 through the thirteenth resistor R13, a non-inverting terminal of the fourth operational amplifier OP4 is connected to one end of the fifteenth resistor R15, a non-inverting terminal of the first comparator A1 and an inverting terminal of the second comparator A2 and connected to the first power supply VCC1 through the fourteenth resistor R14, the other end of the fifteenth resistor R15 is grounded, the inverting terminal of the first comparator A1 is connected to the non-inverting terminal of the second comparator A2 and the output terminal of the third operational amplifier OP3, and the output terminal of the first comparator A1 and the output terminal of the second comparator A2 are respectively connected to the IO5 terminal and the IO6 terminal of the first controller U1.

[0050] In specific embodiments, the first power supply VCC1, the fourteenth resistor R14 and the fifteenth resistor R15 provide a reference threshold value; the fourth operational amplifier OP4 can be an OP07 operational amplifier for voltage following processing; and the first comparator A1 and the second comparator A2 can be LM358 comparators for voltage comparison, which do not work when the input voltages are equal.

[0051] Further, the sampling switching module 6 comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first analog switch IC1.

[0052] Specifically, a third terminal of the first analog switch IC1 is connected to one end of the second resistor R2 and connected to a first terminal of the first battery interface through the first resistor R1, the other end of the second resistor R2 is connected to a first terminal of the second battery interface and connected to an eighth terminal of the first analog switch IC1 and one end of the fourth resistor R4 through the third resistor R3, the other end of the fourth resistor R4 is connected to a second terminal of the second battery interface, a fourth terminal of the first analog switch IC1 is connected to a ninth terminal of the first analog switch IC1 and the change degree detection module 7, and a fifth terminal and a sixth terminal of the first analog switch IC1 are respectively connected to an IO7 terminal and an IO8 terminal of the first controller U1.

[0053] In specific embodiments, the first resistor R1 and the second resistor R2 perform voltage division sampling on the first battery interface, and the third resistor R3 and the fourth resistor R4 perform voltage division sampling on the second battery interface; and the first analog switch IC1 can be a CD4066 chip.

[0054] Further, the switching control module 5 comprises a first inverter INV1, a second inverter INV2, a first logic chip J1, a second logic chip J2 and a third logic chip J3.

[0055] Specifically, the input terminals of the first and second inverters INV1 and INV2 are connected to the output terminals of the first and second comparators A1 and A2 respectively, the output terminals of the first and second inverters INV1 and INV2 are connected to the A terminal of the second logic chip J2 and the B terminal of the third logic chip J3 respectively, the B terminal of the second logic chip J2 is connected to the A terminal of the third logic chip J3 and the Y terminal of the first logic chip J1, the A and B terminals of the first logic chip J1 are connected to the IO1 and IO2 terminals of the first controller U1 respectively, and the Y terminals of the second and third logic chips J2 and J3 are connected to the sixth and fifth terminals of the first analog switch IC1 respectively.

[0056] In specific embodiments, the first and second inverters INV1 and INV2 can be selected as NAND chips, the first logic chip J1 can be selected as a NOR chip, and the second and third logic chips J2 and J3 can be selected as AND chips.

[0057] Further, the variation degree detection module 7 comprises a sample-and-hold device, a third inverter INV3, a second analog switch IC2, a seventeenth resistor R17, a first switch tube V1, a subtraction device, a first potentiometer RP1, a first diode D1 and a sixteenth resistor R16.

[0058] Specifically, the input terminals of the sample-and-hold device are connected to the fourth terminal of the first analog switch IC1, the eighth and tenth terminals of the second analog switch IC2, the output terminal of the sample-and-hold device is connected to the output terminal of the third inverter INV3, the input terminal of the third inverter INV3 is connected to the IO3 terminal of the first controller U1 and the collector of the first switch tube V1 through the seventeenth resistor R17, the fourth and fifth terminals of the second analog switch IC2, the third and first terminals of the second analog switch IC2 are both connected to the output terminal of the sample-and-hold device, the fourth and eleventh terminals of the second analog switch IC2 are both connected to the first input terminal of the subtraction device, the ninth and second terminals of the second analog switch IC2 are both connected to the second input terminal of the subtraction device, the output terminal of the subtraction device is connected to the IO9 terminal of the first controller U1 and the wiper terminal of the first potentiometer RP1 and connected to the cathode of the first diode D1 through the first potentiometer RP1, the anode of the first diode D1 is connected to the IO4 terminal of the first controller U1 and grounded through the sixteenth resistor R16, the base of the first switch tube V1 is connected to the IO2 terminal of the first controller U1, the twelfth and thirteenth terminals of the second analog switch IC2, and the emitter of the first switch tube V1 is grounded.

[0059] In specific embodiments, the above-mentioned sample-and-hold device can be composed of an operational amplifier, a resistor, an analog switch and a capacitor, when the input is high, the capacitor samples the input signal in real time, when the input becomes low, the capacitor holds the sampled signal; the above-mentioned third inverter INV3 can be a NOT gate chip; the above-mentioned second analog switch IC2 can be a CD4066 chip; the above-mentioned first switch tube V1 can be an NPN type triode; the above-mentioned subtraction device can be composed of an operational amplifier and a resistor, the voltage at the first input end of the subtraction device is subtracted from the voltage at the second input end of the subtraction device; the above-mentioned first potentiometer RP1 and the first diode D1 set the voltage threshold value to determine whether the self-discharge rate is abnormal.

[0060] In the new energy automobile battery electric change detection system of the embodiment, when no charging or discharging is performed, one or more groups of batteries connected with the first battery interface and one or more groups of batteries connected with the second battery interface are divided by the fifth resistor R5 and the sixth resistor R6, wherein the first battery interface and the second battery interface are connected in series, the voltage of the one or more groups of batteries connected with the second battery interface is detected by the non-inverting terminal of the second operational amplifier OP2, the voltage average value of the batteries connected with the first battery interface and the batteries connected with the second battery interface in series and the voltage value of the batteries connected with the second battery interface are amplified and the voltage difference value is calculated by the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12 and the third operational amplifier OP3, and the first difference signal is output by the third operational amplifier OP3. When the first difference signal is equal to the reference threshold value, the voltage is balanced. If the first difference signal is greater than the reference threshold value, the second comparator A2 outputs a high level, indicating that the voltage of the one or more groups of batteries connected with the first battery interface is greater than the voltage of the one or more groups of batteries connected with the second battery interface, and the one or more groups of batteries connected with the second battery interface has a faster self-discharge. The first comparator A1 outputs a low level, and after being inverted by the first inverter INV1, the Y terminal of the second logic chip J2 outputs a high level, i.e. the first switching signal, so that the eighth terminal and the ninth terminal of the first analog switch IC1 are turned on, the second sampling signal sampled by the third resistor R3 and the fourth resistor R4 is transmitted to the sampling holding device for sampling processing, and at the same time, the first controller U1 receives the high level output by the second comparator A2, the IO3 terminal of the first controller U1 starts timing work and outputs a timing signal, and after being processed by the third inverter INV3, the sampling holding device performs sampling holding processing, the second analog switch IC2 transmits, and the subtraction device performs subtraction processing on the signal held by the sampling holding device transmitted by the second analog switch IC2 and the signal transmitted by the first analog switch IC1 transmitted by the second analog switch IC2. If the second difference signal obtained by the subtraction is greater than the voltage threshold value set by the first potentiometer RP1 and the first diode D1 during the timing period, a first abnormal signal is output and received by the IO4 terminal of the first controller U1. The IO4 terminal of the first controller U1 only receives signals during self-discharge detection, indicating that the one or more groups of batteries connected with the second battery interface have a self-discharge abnormality at this time. Similarly, when the first comparator A1 outputs a high level, it indicates that the one or more groups of batteries connected with the first battery interface have a faster self-discharge, and the self-discharge rate of the one or more groups of batteries connected with the first battery interface is detected to determine whether there is a self-discharge abnormality. If charging is performed, the IO2 terminal of the first controller U1 controls the second power tube Q2 and the first switch tube V1 to be turned on, the second analog switch IC2 switches the signal transmission path, so that the subtraction device normally performs subtraction work, and the direct current power input from the power port is transmitted to the first battery interface.Similarly, the differential pressure detection module 4 judges whether the voltage of the first battery interface and the second battery interface is balanced, and when unbalanced, the IO7 terminal or the IO8 terminal of the first controller U1 can output the fourth control signal or the third control signal respectively, and the change degree detection module 7 detects the charging voltage change of the first battery interface or the second battery interface, and the charging voltage change rate is received and calculated by the IO9 terminal of the first controller U1. Similarly, when discharging, the IO1 terminal of the first controller U1 controls the first power tube Q1 to be turned on, and when the differential pressure detection module 4 detects that the voltage of the first battery interface or the second battery interface is unbalanced, the change degree detection module 7 detects the discharge voltage change of the first battery interface or the second battery interface, and the discharge voltage change rate is received and calculated by the IO9 terminal of the first controller U1.

[0061] It will be obvious to a person skilled in the art that, as the application is not limited to the details of the exemplary embodiments described above, it can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. Consequently, the embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and it is intended to embrace all changes and modifications that fall within the meaning and range of equivalents of the claims. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0062] Furthermore, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A new energy automobile battery electric change detection system, characterized in that: the new energy automobile battery electric change detection system comprises a charging and discharging module, a first battery module, a second battery module, a differential pressure detection module, a switching control module, a sampling switching module, a change degree detection module and an intelligent control module; the charging and discharging module is connected with the intelligent control module and the first battery module, and is used for transmitting the accessed direct current to the first battery module when receiving the charging signal output by the intelligent control module, and receiving the third electric energy provided by the first battery module when receiving the discharging signal output by the intelligent control module; the first battery module is connected with the second battery module, and is used for receiving and storing direct current and outputting first electric energy, and superimposing the released electric energy and the second electric energy provided by the second battery module and providing third electric energy; the second battery module is used for receiving and storing the first electric energy and providing the second electric energy; the differential pressure detection module is connected with the first battery module and the second battery module, and is used for setting a reference threshold, performing voltage difference calculation and signal amplification processing on the voltage average value of the first battery module and the second battery module and the second electric energy, outputting a first difference signal, outputting a first control signal when the first difference signal is greater than the reference threshold, and outputting a second control signal when the first difference signal is less than the reference threshold; the switching control module is connected with the differential pressure detection module and the intelligent control module, and is used for outputting a first switching signal when no first control signal is received and no charging signal or discharging signal is output by the intelligent control module, and outputting a second switching signal when no second control signal is received and no charging signal or discharging signal is output by the intelligent control module; the sampling switching module is connected with the first battery module, the second battery module, the intelligent control module, the switching control module and the change degree detection module, and is used for performing voltage division sampling on the electric energy released by the first battery module and outputting a first sampling signal, performing voltage division sampling on the second electric energy and outputting a second sampling signal, transmitting the second sampling signal to the change degree detection module when receiving the first switching signal or a third control signal output by the intelligent control module, and transmitting the first sampling signal to the change degree detection module when receiving the second switching signal or a fourth control signal output by the intelligent control module; the change degree detection module is connected with the intelligent control module, and is used for setting a voltage threshold, sampling the input first sampling signal or second sampling signal, performing holding processing on the sampled signal and outputting a first detection signal when receiving a timing signal output by the intelligent control module, performing subtraction processing on the first detection signal and the input first sampling signal or second sampling signal and outputting a second difference signal, outputting a first abnormal signal when the second difference signal is greater than the voltage threshold, and performing subtraction processing on the first sampling signal or the second sampling signal and the first detection signal and outputting a third difference signal when receiving the charging signal output by the intelligent control module. ​ ​ ​ ​ ​ ​ ​ ​ The intelligent control module is connected with the differential pressure detection module, is used for receiving the first control signal and the second control signal, and outputs the third control signal, the fourth control signal, the charging signal and the discharging signal; when battery self-discharge voltage change detection or charging and discharging voltage change detection is needed, a timing signal is outputted; when the first abnormal signal is received, it is judged that the new energy automobile battery is abnormal; when the third difference signal or the second difference signal is received, the battery voltage change rate is calculated.

2. The system according to claim 1, wherein The charging and discharging module comprises an electric energy port, a first power tube and a second power tube; the intelligent control module comprises a first controller; the first battery module comprises a first battery interface; the second battery module comprises a second battery interface; The first end of the electric energy port is connected with the drain electrode of the second power tube, the source electrode of the second power tube is connected with the source electrode of the first power tube, the drain electrode of the first power tube is connected with the first end of the first battery interface, the second end of the first battery interface is connected with the first end of the second battery interface, the second end of the second battery interface is connected with the second end of the electric energy port, and the gate electrode of the first power tube and the gate electrode of the second power tube are respectively connected with the IO1 end and the IO2 end of the first controller.

3. The system according to claim 2, wherein, The differential pressure detection module comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first operational amplifier, a second operational amplifier, a third operational amplifier and a twelfth resistor; One end of the fifth resistor is connected with the first end of the first battery interface, the other end of the fifth resistor is connected with the non-inverting terminal of the first operational amplifier and the second end of the second battery interface through the sixth resistor, the inverting terminal of the first operational amplifier is connected with one end of the eighth resistor and one end of the ninth resistor through the seventh resistor and the inverting terminal of the second operational amplifier, the other end of the eighth resistor is connected with the output terminal of the first operational amplifier and the non-inverting terminal of the third operational amplifier through the tenth resistor, the inverting terminal of the third operational amplifier is connected with one end of the twelfth resistor and the other end of the ninth resistor through the eleventh resistor and the output terminal of the second operational amplifier, the non-inverting terminal of the second operational amplifier is connected with the first end of the second battery interface, and the output terminal of the third operational amplifier is connected with the other end of the twelfth resistor.

4. The system according to claim 3, wherein the system further comprises a battery voltage change detection unit. The differential pressure detection module further comprises a fourth operational amplifier, a thirteenth resistor, a first power supply, a fourteenth resistor, a fifteenth resistor, a first comparator and a second comparator; The output terminal of the fourth operational amplifier is connected with the inverting terminal of the fourth operational amplifier and the non-inverting terminal of the third operational amplifier through the thirteenth resistor, the non-inverting terminal of the fourth operational amplifier is connected with one end of the fifteenth resistor, the non-inverting terminal of the first comparator and the inverting terminal of the second comparator and the first power supply through the fourteenth resistor, the other end of the fifteenth resistor is grounded, the inverting terminal of the first comparator is connected with the non-inverting terminal of the second comparator and the output terminal of the third operational amplifier, and the output terminal of the first comparator and the output terminal of the second comparator are respectively connected with the IO5 end and the IO6 end of the first controller.

5. The system according to claim 4, wherein, The sampling switching module comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first analog switch; The third end of the first analog switch is connected to one end of a second resistor and the first end of the first battery interface through a first resistor, the other end of the second resistor is connected to the first end of the second battery interface and one end of a fourth resistor through a third resistor and the eighth end of the first analog switch, the other end of the fourth resistor is connected to the second end of the second battery interface, the fourth end of the first analog switch is connected to the ninth end of the first analog switch and a change degree detection module, and the fifth end and the sixth end of the first analog switch are respectively connected to the IO7 end and the IO8 end of the first controller.

6. The system according to claim 5, wherein the system further comprises a battery voltage sensor. The switching control module comprises a first inverter, a second inverter, a first logic chip, a second logic chip and a third logic chip; The input end of the first inverter and the input end of the second inverter are respectively connected to the output end of the first comparator and the output end of the second comparator, the output end of the first inverter and the output end of the second inverter are respectively connected to the A end of the second logic chip and the B end of the third logic chip, the B end of the second logic chip is connected to the A end of the third logic chip and the Y end of the first logic chip, the A end and the B end of the first logic chip are respectively connected to the IO1 end and the IO2 end of the first controller, and the Y end of the second logic chip and the Y end of the third logic chip are respectively connected to the sixth end and the fifth end of the first analog switch.

7. The system according to claim 6, wherein, The change degree detection module comprises a sample and hold device, a third inverter, a second analog switch, a seventeenth resistor, a first switch tube, a subtraction device, a first potentiometer, a first diode and a sixteenth resistor; The input end of the sample and hold device is connected to the fourth end of the first analog switch, the eighth end and the tenth end of the second analog switch, the output end of the sample and hold device is connected to the output end of the third inverter, the input end of the third inverter is connected to the IO3 end of the first controller and the collector of the first switch tube through the seventeenth resistor, the fourth end and the fifth end of the second analog switch, the third end and the first end of the second analog switch are both connected to the output end of the sample and hold device, the fourth end and the eleventh end of the second analog switch are both connected to the first input end of the subtraction device, the ninth end and the second end of the second analog switch are both connected to the second input end of the subtraction device, the output end of the subtraction device is connected to the IO9 end of the first controller and the wiper end of the first potentiometer and the cathode of the first diode through the first potentiometer, the anode of the first diode is connected to the IO4 end of the first controller and grounded through the sixteenth resistor, the base of the first switch tube is connected to the IO2 end of the first controller, the twelfth end and the thirteenth end of the second analog switch, and the emitter of the first switch tube is grounded.

Images