CN111830421A - Echelon utilization detection device for electric automobile retired lithium battery - Google Patents
Echelon utilization detection device for electric automobile retired lithium battery Download PDFInfo
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- CN111830421A CN111830421A CN201910313457.0A CN201910313457A CN111830421A CN 111830421 A CN111830421 A CN 111830421A CN 201910313457 A CN201910313457 A CN 201910313457A CN 111830421 A CN111830421 A CN 111830421A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 119
- 238000001514 detection method Methods 0.000 title claims abstract description 70
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 238000004891 communication Methods 0.000 claims abstract description 17
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 20
- 238000013461 design Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 6
- 230000036541 health Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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Abstract
The invention relates to a echelon utilization detection device for retired lithium batteries of electric vehicles, which comprises a plurality of groups of lithium battery modules, wherein each group of lithium battery modules in the plurality of groups of lithium battery modules are respectively connected with the same CAN bus through a test unit circuit, the positive electrode of one group of lithium battery modules in the plurality of groups of lithium battery modules is in communication connection with the CAN bus after sequentially passing through a charging and discharging device and an upper computer, the negative electrode of one group of lithium battery modules in the plurality of groups of lithium battery modules is grounded after passing through a shunt, the test unit circuit comprises a fan control circuit module, a voltage detection circuit module, a balance control circuit module, a temperature detection circuit module and a fan control circuit module which are respectively connected with each group of lithium battery, the voltage detection circuit module, the balance control circuit module and the temperature detection circuit module are all connected with a main controller, and the main controller is connected with a CAN bus through a CAN communication circuit module. Compared with the prior art, the invention has the advantages of high precision, short testing time and the like.
Description
Technical Field
The invention relates to the technical field of electric automobile retired lithium battery treatment, in particular to a echelon utilization detection device for electric automobile retired lithium batteries.
Background
With the development of the world automobile industry, on one hand, the consumption of petroleum energy is increasing day by day, the step of energy shortage is accelerated, and the development of new energy automobiles and the development of novel power automobiles become urgent tasks facing the world automobile industry. The electric automobile is favored with the advantages of small pollution, low noise, high energy efficiency, diversified energy sources and the like, when the charge capacity of the automobile lithium battery pack is reduced to about 80% of the original capacity, the automobile lithium battery pack is no longer suitable for being continuously used in the electric automobile, and if the lithium battery pack is scrapped for recycling, the best use of the lithium battery pack cannot be realized, and great resource waste is caused. Under the conditions that the appearance of the lithium battery is intact, the lithium battery is not damaged, and each functional element is effective, the echelon recycling of the lithium battery can be discussed. In the aspect of large-scale power battery echelon utilization technology, China starts late, and has a large gap compared with developed countries, the gap between the research levels of China and foreign countries is large in the application of the energy storage device with the second gradient, and the application scale of battery energy storage in China is still small. Aiming at the problem of inconsistent decline of the working characteristics of the lithium battery utilized in a gradient manner, the characteristics of the lithium battery such as effective capacity, internal resistance, open-circuit voltage, different current multiplying powers and the like are analyzed, the fact that the capacity and internal resistance parameters of the lithium battery conform to normal distribution after repeated recycling is pointed out, the polarization phenomenon of a retired lithium battery is serious compared with that of a new battery during high-rate charging and discharging, and the method is suitable for being applied to an energy storage system for low-rate charging and discharging.
The following problems exist in the prior art:
(1) the lithium battery retired from the electric automobile is in an offline state. In other words, the lithium battery pack lacks support of historical data at this time, and even important data is lost, so it is difficult to estimate the health status of the lithium battery in this case.
(2) An external variable test environment. If historical data and important data are lost, such as data of the charge characteristics and cycle times of the lithium battery and the like, and external environment temperature fluctuation are generated, the difficulty of estimating the health state of the lithium battery in a gradient manner is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a echelon utilization detection device for a retired lithium battery of an electric vehicle, starts from the aspects of performance verification and quality classification of the retired lithium battery, researches the service life characteristics of the lithium battery, selects and designs a test method, a test mode and test conditions suitable for the retired lithium battery, completes the test of the lithium battery pack within the range allowed by actual engineering conditions (limited test time and environmental conditions), and accurately decides a suitable gradient range.
The purpose of the invention can be realized by the following technical scheme:
a echelon utilization detection device for electric automobile retired lithium batteries comprises a plurality of groups of lithium battery modules, wherein each group of lithium battery modules in the plurality of groups of lithium battery modules are respectively connected with the same CAN bus through a test unit circuit, the anode of one group of lithium battery modules in the plurality of groups of lithium battery modules is in communication connection with the CAN bus after sequentially passing through a charging and discharging device and an upper computer, the cathode of one group of lithium battery modules in the plurality of groups of lithium battery modules is grounded after passing through a shunt, the test unit circuit comprises a fan control circuit module, a voltage detection circuit module, a balance control circuit module and a temperature detection circuit module which are respectively connected with each group of lithium battery modules, the fan control circuit module, the voltage detection circuit module, the balance control circuit module and the temperature detection circuit module are all connected with a main controller, the main controller is connected with the CAN bus through a CAN communication circuit module.
Furthermore, the main controller is also connected with a relay which is used for controlling the switch-off of the switch connected with the anode of one group of lithium battery modules in the multiple groups of lithium battery modules.
Further, the voltage detection circuit module comprises an operational amplifier and analog switches connected with the input positive electrode and the input negative electrode of the operational amplifier, the voltage detection circuit module is connected with the lithium battery module through the analog switches, the model of a chip adopted by the operational amplifier is OPA454, and the model of a chip adopted by the analog switches is MAX 14752.
Further, the temperature detection circuit module comprises a differential amplifier and a thermistor, wherein the thermistor is connected with the input positive electrode and the input negative electrode of the differential amplifier in parallel through a divider resistor, and the chip model of the differential amplifier is TL 084.
Further, the balanced control circuit module includes equalizer circuit and with equalizer circuit current detection circuitry and equalizer circuit voltage detection circuitry that equalizer circuit looks topology is connected, including a plurality of parallel connection's each other single-pole relay and a plurality of and the single-pole relay output looks series connection's double-pole relay, every the input of single-pole relay with single section lithium cell among the lithium cell module corresponds and is connected, the positive negative pole of the output of double-pole relay and the positive negative pole parallel connection of electric capacity group.
Furthermore, the voltage detection circuit of the equalizing circuit comprises an operation comparator, the input positive electrode and the input negative electrode of the operation comparator are respectively connected with the positive electrode and the negative electrode of the capacitor bank in parallel after passing through a resistor, the output end of the operation comparator is connected with a PB7 pin of the main controller, and the operation comparator adopts a chip model of TL 084.
Further, the equalization circuit current detection circuit comprises a differential amplifier, a first operational amplifier and a second operational amplifier, wherein an output end of the differential amplifier is connected with a negative electrode of an input end of the first operational amplifier, an output end of the first operational amplifier is connected with a reference voltage source in parallel and then is connected with a positive electrode of an input end of the second operational amplifier, an output end of the second operational amplifier is connected with a PB8 pin of the main controller, a positive electrode of the input end of the first operational amplifier and a negative electrode of the input end of the second operational amplifier are grounded, the differential amplifier adopts a chip model of INA149, and the first operational amplifier adopts a chip model of TLC 52.
Further, the fan control circuit module comprises a comparator and a switch tube connected with the output end of the comparator, the model of a chip adopted by the comparator is LM324, and the model of the switch tube is IRFIZ 24N.
Further, the CAN communication circuit module includes a CAN transceiver, a digital isolator and a DB9 connector, the CAN transceiver uses a TJA1050 chip, the digital isolator uses an ADUM1201 chip, a CANH end and a CANL end of the TJA1050 chip are respectively and correspondingly connected with a No. 3 socket and a No. 2 socket of the DB9 connector, an RXD end and a TXD end thereof are respectively and correspondingly connected with a Via end and a Vcb end of the ADUM1201 chip, a Vcc end and a Vih end of the ADUM1201 chip are respectively and correspondingly connected with a PC11 pin and a PC10 pin of the main controller, and a No. 9 interface and a No. 1 interface of the DB9 connector are correspondingly connected with a power supply terminal 5V and a ground terminal of a CAN bus.
Compared with the prior art, the invention has the following advantages:
(1) the test unit circuit mainly completes the functions of voltage detection, temperature detection, fan control, relay control and the like of each single battery in the lithium battery module, and a balance control circuit is designed for ensuring that the designed test unit circuit has universality and realizing the corresponding functions of a lithium battery management system. The method realizes the detection of the health parameters of the lithium battery in a gradient manner, improves an online parameter identification method of a health life model and a lithium battery health characteristic extraction method, and improves the accuracy of the health parameters of the off-line lithium battery.
(2) Aiming at the problem that the testing time of the lithium battery in the off-line state is too long, the invention provides a software and hardware solution, and the whole testing time of the lithium battery performance testing working condition is shortened through experimental verification, so that the lithium battery performance testing working condition can be applied to engineering. Aiming at the problem that each single battery in the lithium battery module has charge characteristic difference, the balancing function of the lithium battery module is started through designing a balancing circuit and program control, and the problem that each lithium battery has large difference in the balanced charging and discharging process of the lithium battery is solved.
Drawings
FIG. 1 is a schematic diagram of the overall architecture of the apparatus of the present invention;
FIG. 2 is a schematic diagram of a lithium battery voltage detection circuit module according to the present invention;
FIG. 3 is a schematic diagram of a temperature detection circuit module of a lithium battery according to the present invention;
fig. 4 is a schematic diagram of an equalizing control circuit module according to the present invention, wherein fig. 4-a is a schematic diagram of an equalizing circuit current detection circuit, fig. 4-b is a schematic diagram of an equalizing circuit voltage detection circuit, and fig. 4-c is a schematic diagram of an equalizing circuit;
FIG. 5 is a schematic diagram of a fan control circuit module according to the present invention;
fig. 6 is a schematic diagram of a CAN communication circuit module according to the present invention, wherein fig. 6-a is a connection schematic diagram of a digital isolator, fig. 6-b is a connection schematic diagram of a CAN transceiver, and fig. 6-c is a connection schematic diagram of a DB9 connector;
FIG. 7 is a block diagram of the overall logic control of the software control part of the invention;
FIG. 8 is a logic diagram of the DSP main control of the software control part of the invention;
FIG. 9 is a control logic block diagram of a lithium battery equalization circuit of the supporting software control part of the present invention;
fig. 10 is a logic block diagram of an upper computer of a supporting software control part of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Examples
As shown in FIG. 1, the overall architecture design of the device of the present invention comprises a plurality of sets of lithium battery modules, each set of lithium battery modules in the plurality of sets of lithium battery modules is respectively connected with the same CAN bus through a test unit circuit, the positive electrode of one set of lithium battery modules in the plurality of sets of lithium battery modules is in communication connection with the CAN bus after sequentially passing through a charging and discharging device and an upper computer, the negative electrode of one set of lithium battery modules in the plurality of sets of lithium battery modules is grounded after passing through a shunt, the test unit circuit comprises a fan control circuit module, a voltage detection circuit module, a balance control circuit module, a temperature detection circuit module and a fan control circuit module which are respectively connected with each set of lithium battery modules, the voltage detection circuit module, the balance control circuit module and the temperature detection circuit module are all connected with a main controller, and the main controller is connected with a CAN bus through a CAN communication circuit module.
The test unit circuit mainly completes the functions of voltage detection, temperature detection, fan control, relay control and the like of each single battery in the lithium battery module, and a balance control circuit is designed for ensuring that the designed test unit circuit has universality and realizing the corresponding functions of a lithium battery management system. The specific scheme is as follows:
1. hardware design
The hardware part of the system comprises a main control circuit, a lithium battery voltage detection circuit, a lithium battery temperature detection circuit, a lithium battery module equalization circuit, a lithium battery fan control circuit design and a CAN communication circuit design circuit, wherein the CAN communication circuit and the temperature detection circuit need to be externally connected with a thermistor, a fan and relay control circuit attached to the surface of a lithium battery, a single voltage detection circuit and a equalization control circuit of the lithium battery module, and control analog switches are used for selecting the voltage of each single battery in the detection module and controlling a relay switch array to realize the equalization management of each single battery. The specific design scheme is as follows:
(1) master control selection
In the embodiment, a TM320F2812 chip produced by TI company is selected, TMS320F2812 has strong digital processing capability, and a 32-bit fixed point Micro Control Unit (MCU) has a master frequency as high as 150 MHz; the controller is provided with bus interfaces such as I2C, SPI, CAN, PWM and the like, and is suitable for various control industrial equipment; the resources of which meet the design requirements of the present example.
(2) Lithium battery voltage detection circuit design (as shown in figure 2)
A detection circuit for measuring the voltage of a lithium battery is designed based on a method of an analog switch and an operational amplifier, and because the total voltage of a battery module formed by serially connecting batteries is higher, an analog switch chip MAX14752 produced by Maxim company and an operational amplifier chip OPA454 produced by TI company are adopted. And the single voltage detection circuit and the balance control circuit of the lithium battery module control the analog switch to select the voltage of each single battery in the detection module and control the relay switch array to realize the balance management of each single battery.
The OPA454 supports +/-50V power supply at the highest, the requirement of high common-mode input voltage of the lithium battery module can be met, and two OPAs 454 are required to be used in cooperation with a front-end analog switch. The main controller can realize the voltage detection of each single battery in the lithium battery module by controlling the enabling port and the logic gating port of the MAX14752 chip.
(3) Lithium battery temperature detection circuit design (as shown in figure 3)
The temperature detection circuit is designed by adopting a double-bridge arm bridge circuit, as shown in fig. 3, the thermistor shows different resistance values at different temperatures, different difference voltages are obtained and are differentially amplified by the operational amplifier TL084, and the output voltage of the operational amplifier is processed by the main controller to obtain a temperature value.
(4) Lithium battery module equalization circuit design (as shown in figure 4-a, figure 4-a and figure 4-c)
The lithium battery module balancing main circuit is designed by a bidirectional Buck-Boost balancing topological structure taking a super capacitor as an energy transmission medium, a balancing circuit current detection circuit is shown in a figure 4-a, a high-voltage and high-precision differential amplifier INA149 produced by TI is adopted, and after amplification by TLC2652, a 2.5V reference voltage is superposed to be converted into an acceptable voltage range of an AD converter.
The equalization circuit voltage detection circuit is shown in fig. 4-b.
The principle diagram of the balancing circuit is shown in fig. 4-c, the front end of the balancing circuit is connected with a relay array circuit, in the diagram, K1-K17 are single-pole relays, K18 and K19 are double-pole relays, the relay array circuit is used for selecting single batteries needing balancing from the lithium battery module, each single battery is gated, and the main controller gates different relays in a time-sharing mode according to detection data and control requirements of the lithium battery module to achieve balancing control of the single batteries in the lithium battery module.
(5) Lithium battery fan control circuit design (as shown in figure 5)
Fan control circuit schematic as shown in FIG. 5, using LM324 chip as comparator, the fan speed can be controlled by controlling the PWM duty cycle.
(6) CAN communication circuit design (as shown in figure 6-a, figure 6-b and figure 6-c)
The CAN communication circuit schematic diagram is shown in fig. 6-c, a TJA1050 chip produced by NXP company is used as a CAN high-speed transceiver, and bus terminal signals CANH and CANL are connected to a CAN communication bus through a DB9 interface.
2. System software design
(1) Overall software block diagram (as shown in figure 7)
CCS6.0 compiling environment design test unit circuit control program provided by TI company is used, the general design flow chart of system software is shown in figure 7, and system initialization is carried out when the system is powered on; if no detection fault exists, the charging and discharging control of the lithium battery pack CAN be started, real-time collected data are uploaded through the CAN bus, and the test unit circuit receives the real-time data and runs the state of charge estimation algorithm.
(2) DSP program design (as shown in FIG. 8)
The DSP software design flow chart is shown in FIG. 8, when the system is powered on, the system is initialized, resources on the single chip are initialized, such as an I/O port, a system clock, CAN communication, an AD converter and the like, after charging and discharging are started, the single chip detects charging and discharging currents in real time, detected data are uploaded to each testing unit circuit and an upper computer through a CAN bus, and the steps are repeated until charging and discharging of the lithium battery pack are finished, and the single chip immediately enters a dormant state.
(3) Equalizer circuit control programming (as shown in FIG. 9)
The charge characteristic differences of the single batteries in the lithium battery module cannot be avoided, the equalization function of the lithium battery module is started through program control, the design adopts an equalization control mode based on the charge characteristic, and a flow chart of an equalization control program is shown in fig. 9. Estimating the current state of charge (SOC) of each single battery in real time, comparing the SOC values, starting an equalizing circuit control program to store the redundant energy (delta SOC-SOCmin)/2) of the battery with a larger SOC value in a super capacitor when the difference between the maximum SOC value (SOCmax) and the minimum SOC value (SOCmin) exceeds a set SOC difference range (delta SOCdis), then controlling a Buck circuit to store the energy (delta SOC) in the battery with a smaller SOC value, and repeating the process until the charging and discharging are finished.
(4) Upper computer software (as shown in figure 10)
The upper computer software system is designed by adopting a vs2010 development environment, a program flow chart is shown in fig. 10, the upper computer software system can receive working data and fault detection data of a lithium battery module uploaded by a single chip microcomputer and a test unit circuit in real time, software parameter setting is firstly carried out, a serial port is opened to receive the working data of the lithium battery module uploaded in real time, the software analyzes the data by adopting a preset frame format, fault information is displayed on a software interface, and the working data of the battery is stored in a database and displayed in a table.
The performance verification working condition test is carried out on the lithium battery in a gradient manner, and parameters such as the terminal voltage (UL), the charging and discharging current (Ib) and the working temperature (T) of each single battery in the lithium battery pack are recorded in real time.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A echelon utilization detection device for electric automobile retired lithium batteries is characterized by comprising a plurality of groups of lithium battery modules, wherein each group of lithium battery modules in the plurality of groups of lithium battery modules are respectively connected with the same CAN bus through a test unit circuit, the positive electrode of one group of lithium battery modules in the plurality of groups of lithium battery modules is in communication connection with the CAN bus after sequentially passing through a charging and discharging device and an upper computer, the negative electrode of one group of lithium battery modules in the plurality of groups of lithium battery modules is grounded after passing through a shunt, the test unit circuit comprises a fan control circuit module, a voltage detection circuit module, a balance control circuit module and a temperature detection circuit module which are respectively connected with each group of lithium battery modules, the fan control circuit module, the voltage detection circuit module, the balance control circuit module and the temperature detection circuit module are all connected with a main controller, the main controller is connected with the CAN bus through a CAN communication circuit module.
2. The echelon utilization detection device for the ex-service lithium battery of the electric vehicle as recited in claim 1, wherein the main controller is further connected with a relay for controlling the switch connected with the positive electrode of one of the plurality of lithium battery modules to be turned off.
3. The echelon utilization detection device for the ex-service lithium battery of the electric vehicle as claimed in claim 1, wherein the voltage detection circuit module comprises an operational amplifier and an analog switch respectively connected with the input positive electrode and the input negative electrode of the operational amplifier, the voltage detection circuit module is connected with the lithium battery module through the analog switch, the operational amplifier adopts a chip model of OPA454, and the analog switch adopts a chip model of MAX 14752.
4. The echelon utilization detection device for the ex-service lithium battery of the electric vehicle as claimed in claim 1, wherein the temperature detection circuit module comprises a differential amplifier and a thermistor, the positive electrode and the negative electrode of the input of the differential amplifier are connected in parallel through a voltage dividing resistor, and the model of a chip adopted by the differential amplifier is TL 084.
5. The device according to claim 1, wherein the balancing control circuit module comprises a balancing circuit, and a balancing circuit current detection circuit and a balancing circuit voltage detection circuit which are topologically connected with the balancing circuit, the balancing circuit comprises a plurality of single-pole relays connected in parallel with each other and a plurality of double-pole relays connected in series with output ends of the single-pole relays, input ends of the single-pole relays are correspondingly connected with the single lithium battery in the lithium battery module, and positive and negative poles of output ends of the double-pole relays are connected in parallel with positive and negative poles of the capacitor bank.
6. The echelon utilization detection device for the ex-service lithium battery of the electric vehicle as claimed in claim 5, wherein the voltage detection circuit of the equalization circuit comprises an operational comparator, the input positive electrode and the input negative electrode of the operational comparator are respectively connected in parallel with the positive electrode and the negative electrode of the capacitor bank after passing through a resistor, the output end of the operational comparator is connected with a PB7 pin of the main controller, and the operational comparator adopts a chip model number TL 084.
7. The echelon utilization detection device for the ex-service lithium battery of the electric vehicle as claimed in claim 5, wherein the equalization circuit current detection circuit comprises a differential amplifier, a first operational amplifier and a second operational amplifier, an output end of the differential amplifier is connected with a negative electrode of an input end of the first operational amplifier, an output end of the first operational amplifier is connected with a reference voltage source in parallel and then connected with a positive electrode of an input end of the second operational amplifier, an output end of the second operational amplifier is connected with a PB8 pin of the main controller, a positive electrode of the input end of the first operational amplifier and a negative electrode of the input end of the second operational amplifier are both grounded, a chip model of the differential amplifier is INA149, and a chip model of the first operational amplifier is TLC 2652.
8. The echelon utilization detection device for the ex-service lithium battery of the electric automobile as recited in claim 1, wherein the fan control circuit module comprises a comparator and a switch tube connected with an output end of the comparator, the comparator adopts a chip model of LM324, and the switch tube adopts a model of IRFIZ 24N.
9. The echelon utilization detection device for the retired lithium battery of the electric vehicle as claimed in claim 1, wherein the CAN communication circuit module comprises a CAN transceiver, a digital isolator and a DB9 connector, the CAN transceiver adopts a TJA1050 chip, the digital isolator adopts an ADUM1201 chip, a CANH end and a CANL end of the TJA1050 chip are correspondingly connected with a No. 3 socket and a No. 2 socket of the DB9 connector respectively, an RXD end and a TXD end thereof are correspondingly connected with a Via end and a Vcb end of the ADUM1201 chip respectively, a Vcc end and a Vih end of the ADUM chip 1201 are correspondingly connected with a PC11 pin and a PC10 pin of the main controller respectively, and a No. 9 interface and a No. 1 interface of the DB9 connector are correspondingly connected with a 5V power supply end and a ground end of a CAN bus.
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Application publication date: 20201027 |