New energy automobile battery electrical change detection system

Abstract

The invention discloses a new energy automobile battery electrical change detection system, and relates to the technical field of battery detection, and the system comprises a charging and discharging module which is used for charging and discharging; the first battery module and the second battery module are both used for storing energy and discharging; the voltage difference detection module is used for carrying out voltage difference calculation and signal amplification and comparing the amplified signal with the voltage of a set reference threshold value; the switching control module is used for performing logic calculation and controlling a signal transmission path of the sampling switching module during self-discharge detection; the sampling switching module is used for carrying out voltage division sampling and controlling signal transmission; the change degree detection module is used for detecting the battery voltage change rate and judging battery abnormity; and the intelligent control module is used for signal receiving 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, so that the detection workload is reduced, and the detection efficiency of battery electric change is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a battery electrical change detection system for new energy vehicles. Background Art

[0002] In order to reduce carbon emissions and lower the consumption of fossil energy, new energy vehicles are constantly developing. As one of the core key components of new energy vehicles, the performance status of battery packs is directly related to the safety and endurance of the vehicle. New energy vehicle batteries in existing technologies are generally composed of multiple groups of single cells. In order to detect the power status of new energy vehicle batteries at all times, each group of single cells in the new energy vehicle battery will be individually voltage tested, resulting in the need for more high-precision voltage sampling devices, and cooperate with the central controller to judge the degree of change in battery power, which not only increases the circuit cost, but also increases the detection workload of the central controller. In addition, when the new energy vehicle battery is not charging and discharging, the new energy vehicle battery will self-discharge. Each group of single cells will be individually self-discharged at all times, further increasing the detection workload of the central controller. Therefore, there is room for improvement. Summary of the Invention

[0003] An embodiment of the present invention provides a new energy vehicle battery charge change detection system to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, a new energy vehicle battery power change detection system is provided, comprising: a charging and discharging module, a first battery module, a second battery module, a pressure difference detection module, a switching control module, a sampling switching module, a change degree detection module and an intelligent control module;

[0005] a charging and discharging module connected to the intelligent control module and the first battery module, configured to transmit the DC power to the first battery module upon receiving a charging signal output by the intelligent control module, and to receive the third power provided by the first battery module upon receiving a discharging signal output by the intelligent control module;

[0006] The first battery module is connected to the second battery module and is used to receive and store DC power and output first power, and superimpose the released power with the second power provided by the second battery module to provide third power;

[0007] a second battery module, configured to receive and store the first electrical energy and provide the second electrical energy;

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

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

[0010] a sampling and switching module connected to the first battery module, the second battery module, the intelligent control module, the switching control module, and the change degree detection module, configured to perform voltage-divided sampling on the electric energy released by the first battery module and output a first sampling signal, perform voltage-divided sampling on the second electric energy and output a second sampling signal, transmit the second sampling signal to the change degree detection module upon receiving the first switching signal or the third control signal output by the intelligent control module, and transmit the first sampling signal to the change degree detection module upon receiving the second switching signal or the fourth control signal output by the intelligent control module;

[0011] a change degree detection module connected to the intelligent control module, configured to set a voltage threshold, sample the input first sampling signal or the second sampling signal, maintain the sampled signal and output a first detection signal upon receiving a timing signal output by the intelligent control module, subtract the first detection signal from the input first sampling signal or the second sampling signal and output a second difference signal, output a first abnormality signal when the second difference signal is greater than the voltage threshold, and subtract the first sampling signal or the second sampling signal from the first detection signal upon receiving a charging signal output by the intelligent control module and output a third difference signal;

[0012] The intelligent control module is connected to the pressure difference detection module, and is used 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, and regularly output the timing signal when battery self-discharge voltage change detection or charge and discharge voltage change detection is required. When the first abnormality signal is received, it is determined that the new energy vehicle battery is abnormal, and when the third difference signal or the second difference signal is received, the battery voltage change rate is calculated.

[0013] As a further solution of the present invention: the charging and discharging module includes an electric energy port, a first power tube and a second power tube; the intelligent control module includes a first controller; the first battery module includes a first battery interface; the second battery module includes a second battery interface;

[0014] Preferably, the first end of the power 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 power 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 IO2 end of the first controller.

[0015] As a further solution of the present invention: the pressure difference detection module includes 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 end of the first op amp and is connected to the second end of the second battery interface through the sixth resistor, the inverting end of the first op amp is connected to one end of the eighth resistor and is connected to one end of the ninth resistor and the inverting end of the second op amp through the seventh resistor, the other end of the eighth resistor is connected to the output end of the first op amp and is connected to the non-inverting end of the third op amp through the tenth resistor, the inverting end of the third op amp is connected to one end of the twelfth resistor and is connected to the other end of the ninth resistor and the output end of the second op amp through the eleventh resistor, the non-inverting end of the second op amp is connected to the first end of the second battery interface, and the output end of the third op amp is connected to the other end of the twelfth resistor.

[0017] As a further solution of the present invention: the voltage difference detection module further includes 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 end of the fourth op amp is connected to the inverting end of the fourth op amp and is connected to the non-inverting end of the third op amp through a thirteenth resistor, the non-inverting end of the fourth op amp is connected to one end of the fifteenth resistor, the non-inverting end of the first comparator and the inverting end of the second comparator and is connected to the first power supply through a fourteenth resistor, the other end of the fifteenth resistor is grounded, the inverting end of the first comparator is connected to the non-inverting end of the second comparator and the output end of the third op amp, and the output end of the first comparator and the output end of the second comparator are respectively connected to the IO5 end and IO6 end of the first controller.

[0019] As a further solution of the present invention: the sampling switching module includes 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 is connected to 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 is connected to the eighth end of the first analog switch and one end of the fourth resistor through the third resistor, 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 and sixth ends of the first analog switch are respectively connected to the IO7 and IO8 ends of the first controller.

[0021] As a further solution of the present invention: the switching control module includes 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 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.

[0023] As a further solution of the present invention: the change degree detection module includes a sampling and holding device, a third inverter, a second analog switch, a seventeenth resistor, a first switching tube, a subtraction device, a first potentiometer, a first diode and a sixteenth resistor;

[0024] Preferably, the input end of the sampling and holding 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 sampling and holding 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 is connected to the collector of the first switching tube, the fourth end and the fifth end of the second analog switch through a seventeenth resistor, the third end and the first end of the second analog switch are both connected to the output end of the sampling and holding 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 slider end of the first potentiometer and is 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 is grounded through a sixteenth resistor, the base of the first switching 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 switching tube is grounded.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the new energy vehicle battery electrical change detection system of the present invention uses a pressure difference detection module to detect whether the voltages of the first battery module and the second battery module are balanced and derive the voltages of the first battery module and the second battery module; when the charge and discharge module performs charge and discharge control and the voltages of the first battery module and the second battery module are unbalanced, the intelligent control module can control the sampling switching module to select a sampling object and the battery voltage change rate can be detected by the change degree detection module; when the voltage change rate exceeds the set voltage threshold, it indicates that the battery is abnormal; when the charge and discharge module does not perform charge and discharge control and the voltages of the first battery module and the second battery module are unbalanced, the switching control module controls the sampling switching module to perform voltage sampling on the first battery module or the second battery module with lower voltage, and then 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 indicates that the battery self-discharge is abnormal, thereby improving the detection efficiency of battery electrical changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic block diagram of the principle of a new energy vehicle battery charge change detection system provided by an embodiment of the present invention.

[0028] Figure 2 This is a circuit diagram of a new energy vehicle battery power change detection system provided by an embodiment of the present invention.

[0029] Figure 3 This is a circuit diagram of a switching control module provided by an embodiment of the present invention.

[0030] Figure 4 This is a circuit diagram of a change degree detection module provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In one embodiment, see Figure 1, a new energy vehicle battery power change detection system, including: a charging and discharging module 1, a first battery module 2, a second battery module 3, a pressure difference 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 to the intelligent control module 8 and the first battery module 2, and is configured to transmit the DC power received to the first battery module 2 upon receiving the charging signal output by the intelligent control module 8, and receive the third power provided by the first battery module 2 upon receiving the discharging signal output by the intelligent control module 8;

[0034] The first battery module 2 is connected to the second battery module 3 and is used to receive and store DC power and output first power, and superimpose the released power with the second power provided by the second battery module 3 to provide third power;

[0035] The second battery module 3 is used to receive and store the first electrical energy and provide the second electrical energy;

[0036] The voltage difference detection module 4 is connected to the first battery module 2 and the second battery module 3, and is used to set a reference threshold, calculate the voltage difference between the average voltage of the first battery module 2 and the second battery module 3 and the second electric energy, and perform signal amplification processing, and output a first difference signal. When the first difference signal is greater than the reference threshold, the first control signal is output, and when the first difference signal is less than the reference threshold, the second control signal is output;

[0037] The switching control module 5 is connected to the pressure difference detection module 4 and the intelligent control module 8, and is configured to output a first switching signal when the first control signal is not received and the intelligent control module 8 does not output a charging signal or a discharging signal, and output a second switching signal when the second control signal is not received and the intelligent control module 8 does not output a charging signal or a discharging signal;

[0038] The sampling and switching module 6 is connected to 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 to perform voltage-divided sampling on the electric energy released by the first battery module 2 and output a first sampling signal, perform voltage-divided sampling on the second electric energy and output a second sampling signal, transmit the second sampling signal to the change degree detection module 7 upon receiving the first switching signal or the third control signal output by the intelligent control module 8, and transmit the first sampling signal to the change degree detection module 7 upon receiving the second switching signal or the fourth control signal output by the intelligent control module 8;

[0039] a change degree detection module 7 connected to the intelligent control module 8, configured to set a voltage threshold, sample the input first sampling signal or the second sampling signal, maintain the sampled signal and output a first detection signal upon receiving a timing signal output by the intelligent control module 8, subtract the first detection signal from the input first sampling signal or the second sampling signal and output a second difference signal, output a first abnormality signal when the second difference signal is greater than the voltage threshold, and subtract the first sampling signal or the second sampling signal from the first detection signal upon receiving a charging signal output by the intelligent control module 8 and output a third difference signal;

[0040] The intelligent control module 8 is connected to the pressure difference detection module 4, and is used 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, and output the timing signal at regular intervals when battery self-discharge voltage change detection or charge and discharge voltage change detection is required. When the first abnormal signal is received, it is determined that the new energy vehicle battery is abnormal, and when the third difference signal or the second difference signal is received, the battery voltage change rate is calculated.

[0041] In a specific embodiment, the above-mentioned charge and discharge module 1 can adopt a charge and discharge circuit composed of a field effect transistor and an energy port, which can control the transmission direction of electric energy, perform charging and discharging control, and receive and access electric energy through the energy port; the above-mentioned first battery module 2 can adopt a first battery circuit composed of a first battery interface, connected to the first battery pack, for energy storage and discharge; the above-mentioned second battery module 3 can adopt a second battery circuit composed of a second battery interface, connected to the second battery pack, for energy storage and discharge, and connected in series with the first energy storage module; the above-mentioned pressure difference detection module 4 can adopt a pressure difference detection circuit composed of a resistor, an operational amplifier, a comparator, etc., which can set a reference threshold, detect the average voltage of the first battery module 2 and the second battery module 3 when they are connected in series, and amplify and calculate the difference between the average voltage and the voltage of the second battery module 3, output a first difference signal in accordance with the provided reference threshold, and then compare the voltage magnitude relationship between the first difference signal and the reference threshold to determine whether the voltage of the first battery module 2 and the second battery module 3 is balanced; the above-mentioned switching control module 5 can adopt a switching control circuit composed of an inverter and a logic chip, which can be output according to the pressure difference detection module 4 output when the charging and discharging operation is not in progress. The signal state controls the signal transmission path of the sampling switching module 6; the sampling switching module 6 may adopt a sampling switching circuit composed of a resistor and an analog switch, which may perform voltage division sampling on the first battery module 2 and the second battery module 3, and select signal transmission to transmit the signal sampled from the first battery module 2 or the signal sampled from the second battery module 3 to the degree of change detection module 7; the degree of change detection module 7 may adopt a degree of change detection circuit composed of a sampling and holding device, a resistor, an analog switch, a subtraction device, etc., which may sample and process the input signal, and when the battery voltage change rate detection is required, perform a holding operation, subtract the held signal from the real-time sampled signal, and output a first abnormal signal when the subtraction signal is greater than a set voltage threshold. At the same time, when in the charge and discharge state, a first difference signal and a second difference signal are obtained, and the voltage change rate is obtained in conjunction with the timing time set by the intelligent control module 8; the intelligent control module 8 may adopt an intelligent control circuit composed of a single-chip microcomputer and a clock chip, integrating many components such as an arithmetic unit, a controller, a memory, and an input and output device to realize functions such as signal processing, data storage, module control, and timing control.

[0042] In another embodiment, see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The charging and discharging module 1 includes an electric energy port, a first power tube Q1 and a second power tube Q2; the intelligent control module 8 includes a first controller U1; the first battery module 2 includes a first battery interface; the second battery module 3 includes a second battery interface;

[0043] Specifically, the first end of the power 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 power 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 IO2 end of the first controller U1.

[0044] In a specific embodiment, the above-mentioned first power tube Q1 and the second power tube Q2 can both be N-channel field effect tubes, wherein the first power tube Q1 performs discharge control and the second power tube Q2 performs charging control; the above-mentioned power port is used as a power input or output port; the above-mentioned first controller U1 can be composed of an STM32 microcontroller and a clock chip; the above-mentioned 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 a group of batteries or multiple groups of batteries adjacent to the group of batteries or multiple groups of batteries of the new energy vehicle battery connected to the first battery interface.

[0045] Furthermore, the pressure difference 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 end of the first operational amplifier OP1 and is connected to the second end of the second battery interface through the sixth resistor R6, the inverting end of the first operational amplifier OP1 is connected to one end of the eighth resistor R8, one end of the ninth resistor R9 and the inverting end of the second operational amplifier OP2 are connected through the seventh resistor R7, the other end of the eighth resistor R8 is connected to the output end of the first operational amplifier OP1 and is connected to the non-inverting end of the third operational amplifier OP3 through the tenth resistor R10, the inverting end of the third operational amplifier OP3 is connected to one end of the twelfth resistor R12 and is connected to the other end of the ninth resistor R9 and the output end of the second operational amplifier OP2 through the eleventh resistor R11, the non-inverting end of the second operational amplifier OP2 is connected to the first end of the second battery interface, and the output end of the third operational amplifier OP3 is connected to the other end of the twelfth resistor R12.

[0047] In a specific embodiment, the first operational amplifier OP1, the second operational amplifier and the third operational amplifier OP3 may all be OP07 operational amplifiers, and cooperate 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 to perform voltage average value sampling and voltage difference calculation.

[0048] Furthermore, the voltage difference detection module 4 further includes 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, the output end of the fourth op amp OP4 is connected to the inverting end of the fourth op amp OP4 and is connected to the non-inverting end of the third op amp OP3 through the thirteenth resistor R13. The non-inverting end of the fourth op amp OP4 is connected to one end of the fifteenth resistor R15, the non-inverting end of the first comparator A1 and the inverting end of the second comparator A2 and is connected to the first power supply VCC1 through the fourteenth resistor R14. The other end of the fifteenth resistor R15 is grounded. The inverting end of the first comparator A1 is connected to the non-inverting end of the second comparator A2 and the output end of the third op amp OP3. The output end of the first comparator A1 and the output end of the second comparator A2 are respectively connected to the IO5 end and IO6 end of the first controller U1.

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

[0051] Furthermore, the sampling and switching module 6 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first analog switch IC1;

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

[0053] In a specific embodiment, 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; the first analog switch IC1 may use a CD4066 chip.

[0054] Furthermore, the switching control module 5 includes 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 end of the first inverter INV1 and the input end of the second inverter INV2 are respectively connected to the output end of the first comparator A1 and the output end of the second comparator A2, the output end of the first inverter INV1 and the output end of the second inverter INV2 are respectively connected to the A end of the second logic chip J2 and the B end of the third logic chip J3, the B end of the second logic chip J2 is connected to the A end of the third logic chip J3 and the Y end of the first logic chip J1, the A end and the B end of the first logic chip J1 are respectively connected to the IO1 end and the IO2 end of the first controller U1, and the Y end of the second logic chip J2 and the Y end of the third logic chip J3 are respectively connected to the sixth end and the fifth end of the first analog switch IC1.

[0056] In a specific embodiment, the first inverter INV1 and the second inverter INV2 can both use NOT gate chips; the first logic chip J1 can use NOR gate chips, and the second logic chip J2 and the third logic chip J3 can both use AND gate chips.

[0057] Furthermore, the change degree detection module 7 includes a sampling and holding 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 end of the sampling and holding device is connected to the fourth end of the first analog switch IC1, the eighth end and the tenth end of the second analog switch IC2, the output end of the sampling and holding device is connected to the output end of the third inverter INV3, the input end of the third inverter INV3 is connected to the IO3 end of the first controller U1 and is connected to the collector of the first switch tube V1, the fourth end and the fifth end of the second analog switch IC2 through the seventeenth resistor R17, the third end and the first end of the second analog switch IC2 are both connected to the output end of the sampling and holding device, and the fourth end and the eleventh end of the second analog switch IC2 are both connected to the subtraction The first input terminal of the subtraction device, the ninth terminal and the second terminal of the second analog switch IC2 are all 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 slider terminal of the first potentiometer RP1 and is 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 is 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 terminal and the thirteenth terminal of the second analog switch IC2, and the emitter of the first switch tube V1 is grounded.

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

[0060] In a new energy vehicle battery electrical change detection system according to the present embodiment, when not charging or discharging, a group or multiple groups of batteries connected to a first battery interface and a group or multiple groups of batteries connected to a second battery interface are voltage-divided by a fifth resistor R5 and a sixth resistor R6, wherein the first battery interface is connected in series with the second battery interface, and the voltage of the group or multiple groups of batteries connected to the second battery interface is detected by the non-inverting terminal of the second operational amplifier OP2, and 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 are used to perform voltage division on the average value of the voltage of the battery connected to the first battery interface and the battery connected to the second battery interface after being connected in series with each other and the voltage value of the battery connected to the second battery interface. The amplification and voltage difference calculation are performed, and the third operational amplifier OP3 outputs a first difference signal. When the first difference signal is equal to the reference threshold, the voltage is balanced. If the first difference signal is greater than the reference threshold, the second comparator A2 outputs a high level, indicating that the voltage of one or more battery groups connected to the first battery interface is greater than the voltage of one or more battery groups connected to the second battery interface, and the one or more battery groups connected to the second battery interface have a faster self-discharge. The first comparator A1 will output a low level, which is inverted by the first inverter INV1 and triggers the Y end of the second logic chip J2 to output a high level, that is, the first switching signal, so that the eighth and ninth ends of the first analog switch IC1 are turned on, and the second sampling voltage sampled by the third resistor R3 and the fourth resistor R4 is divided by the voltage. The sample signal is transmitted to the sampling and holding device for sampling processing. At the same time, the first controller U1 receives the high level output by the second comparator A2. The IO3 end of the first controller U1 will start the timing work and output the timing signal regularly. After being processed by the third inverter INV3, the sampling and holding device performs sampling and holding processing. The second analog switch IC2 transmits, and the subtraction device performs subtraction processing on the signal held by the sampling and 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. During the timing period, if the second difference signal obtained by subtraction is greater than the voltage threshold set by the first potentiometer RP1 and the first diode D1, the first abnormal signal is output and the first controller U1 The IO4 terminal of the first controller U1 receives the signal only during self-discharge detection, indicating that one or more groups of batteries connected to the second battery interface have abnormal self-discharge. Similarly, when the first comparator A1 outputs a high level, it indicates that one or more groups of batteries connected to the first battery interface have a relatively fast self-discharge. The self-discharge rate of one or more groups of batteries connected to the first battery interface is detected to determine whether there is abnormal self-discharge. If, during charging, 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 can perform the subtraction work normally, and the DC power connected to the power port is transmitted to the first battery interface.Similarly, the pressure difference detection module 4 determines whether the voltages of the first battery interface and the second battery interface are balanced. If unbalanced, the IO7 or IO8 terminal of the first controller U1 can output a fourth control signal or a third control signal, respectively, to control the change degree detection module 7 to detect the change in the charging voltage of the first battery interface or the second battery interface, which is received and calculated by the IO9 terminal of the first controller U1. Similarly, during discharge operation, the IO1 terminal of the first controller U1 controls the conduction of the first power tube Q1. If the pressure difference detection module 4 detects a voltage imbalance of the first battery interface or the second battery interface, the change degree detection module 7 detects the change in the discharge voltage of the first battery interface or the second battery interface, which is received and calculated by the IO9 terminal of the first controller U1.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0062] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A new energy vehicle battery charge change detection system, characterized by: The new energy vehicle battery power change detection system includes: a charging and discharging module, a first battery module, a second battery module, a pressure difference 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 to the intelligent control module and the first battery module, and is configured to transmit the DC power to the first battery module upon receiving a charging signal output by the intelligent control module, and receive the third power provided by the first battery module upon receiving a discharging signal output by the intelligent control module; The first battery module is connected to the second battery module and is used to receive and store DC power and output first power, and superimpose the released power with the second power provided by the second battery module to provide third power; The second battery module is configured to receive and store the first electrical energy and provide the second electrical energy; The voltage difference detection module is connected to the first battery module and the second battery module, and is used to set a reference threshold, calculate the voltage difference between the average voltage of the first battery module and the second battery module and the second electric energy, and perform signal amplification processing, and output a first difference signal. When the first difference signal is greater than the reference threshold, the first control signal is output, and when the first difference signal is less than the reference threshold, the second control signal is output; The switching control module is connected to the pressure difference 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 a charging signal or a discharging signal, and output a second switching signal when the second control signal is not received and the intelligent control module does not output a charging signal or a discharging signal; The sampling and switching module is connected to 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 to perform voltage-divided sampling on the electric energy released by the first battery module and output a first sampling signal, perform voltage-divided sampling on the second electric energy and output a second sampling signal, transmit the second sampling signal to the change degree detection module upon receiving the first switching signal or the third control signal output by the intelligent control module, and transmit the first sampling signal to the change degree detection module upon receiving the second switching signal or the fourth control signal output by the intelligent control module; The change degree detection module is connected to the intelligent control module and is used to set a voltage threshold, sample the input first sampling signal or the second sampling signal, maintain the sampled signal and output a first detection signal when receiving the timing signal output by the intelligent control module, subtract the first detection signal from the input first sampling signal or the second sampling signal and output a second difference signal, output a first abnormality signal when the second difference signal is greater than the voltage threshold, and subtract the first sampling signal or the second sampling signal from the first detection signal and output a third difference signal when receiving the charging signal output by the intelligent control module; The intelligent control module is connected to the pressure difference detection module, and is used to receive the first control signal and the second control signal, output a third control signal, a fourth control signal, a charging signal and a discharging signal, and regularly output a timing signal when battery self-discharge voltage change detection or charge and discharge voltage change detection is required. When receiving the first abnormality signal, it is determined that the new energy vehicle battery is abnormal, and when receiving the third difference signal or the second difference signal, it is calculated the battery voltage change rate.

2. A new energy vehicle battery power change detection system according to claim 1, characterized in that: The charging and discharging module includes an electric energy port, a first power tube and a second power tube; the intelligent control module includes a first controller; the first battery module includes a first battery interface; the second battery module includes a second battery interface; The first end of the power 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 power port, and the gate of the first power tube and the gate of the second power tube are respectively connected to the IO1 terminal and IO2 terminal of the first controller.

3. A new energy vehicle battery power change detection system according to claim 2, characterized in that: The pressure difference detection module includes 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 to the first end of the first battery interface, the other end of the fifth resistor is connected to the non-inverting end of the first operational amplifier and is connected to the second end of the second battery interface through the sixth resistor, the inverting end of the first operational amplifier is connected to one end of the eighth resistor and is connected to one end of the ninth resistor and the inverting end of the second operational amplifier through the seventh resistor, the other end of the eighth resistor is connected to the output end of the first operational amplifier and is connected to the non-inverting end of the third operational amplifier through the tenth resistor, the inverting end of the third operational amplifier is connected to one end of the twelfth resistor and is connected to the other end of the ninth resistor and the output end of the second operational amplifier through the eleventh resistor, the non-inverting end of the second operational amplifier is connected to the first end of the second battery interface, and the output end of the third operational amplifier is connected to the other end of the twelfth resistor.

4. A new energy vehicle battery power change detection system according to claim 3, characterized in that: The voltage difference detection module further includes 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 end of the fourth operational amplifier is connected to the inverting end of the fourth operational amplifier and is connected to the non-inverting end of the third operational amplifier through a thirteenth resistor. The non-inverting end of the fourth operational amplifier is connected to one end of the fifteenth resistor, the non-inverting end of the first comparator and the inverting end of the second comparator and is connected to the first power supply through a fourteenth resistor. The other end of the fifteenth resistor is grounded. The inverting end of the first comparator is connected to the non-inverting end of the second comparator and the output end of the third operational amplifier. The output end of the first comparator and the output end of the second comparator are respectively connected to the IO5 end and IO6 end of the first controller.

5. A new energy vehicle battery power change detection system according to claim 4, characterized in that: The sampling switching module includes 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 the second resistor and is connected to 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 is connected to the eighth end of the first analog switch and one end of the fourth resistor through the third resistor. 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. The fifth and sixth ends of the first analog switch are respectively connected to the IO7 and IO8 ends of the first controller.

6. A new energy vehicle battery power change detection system according to claim 5, characterized in that: The switching control module includes 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 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. 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.

7. A new energy vehicle battery power change detection system according to claim 6, characterized in that: The change degree detection module includes a sampling and holding 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 sampling and holding 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 sampling and holding 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 is connected to the collector of the first switching tube and the fourth end and the fifth end of the second analog switch through a seventeenth resistor, the third end and the first end of the second analog switch are both connected to the output end of the sampling and holding 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 slider end of the first potentiometer and is 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 is grounded through a sixteenth resistor, the base of the first switching 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 switching tube is grounded.

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