CN102928789B - Distributed detection method with vibration and temperature and humidity detection for lithium battery pack - Google Patents
Distributed detection method with vibration and temperature and humidity detection for lithium battery pack Download PDFInfo
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- CN102928789B CN102928789B CN201210438186.XA CN201210438186A CN102928789B CN 102928789 B CN102928789 B CN 102928789B CN 201210438186 A CN201210438186 A CN 201210438186A CN 102928789 B CN102928789 B CN 102928789B
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Abstract
The invention discloses a distributed detection method with vibration and temperature and humidity detection for a lithium battery pack. According to the method, a grouping detection mode is adopted, 16 lithium batteries are taken as a group for measurement, and each diction unit comprises a relay gating array, a decoder gating array, a precise reference voltage source circuit, a signal conditioning unit, a dial switch, a microprocessor micro controller unit (MCU), a vibration sensor module and a temperature and humidity sensor module. The microprocessor MCU performs loop detection on cells through the relay gating array, the decoder gating array, the precise reference voltage source circuit and the signal conditioning unit; the vibration sensor module and the temperature and humidity sensor module send collected information to the microprocessor MCU through an inter-integrated circuit (I2C) bus and an I/O port respectively; and the detection unit sends collected lithium battery monolithic voltage information, vibration grade information and temperature and humidity information to a lithium battery pack main control unit through a controller area network (CAN) bus. The method is concise and clear, high in reliability and capable of achieving high-precision detection on lithium battery monolithic voltage signals and vibration signals and temperature and humidity signals of battery packs.
Description
Technical field
The invention belongs to a kind of lithium battery distribution type detection method, specifically a kind of lithium battery distribution type detection method with vibration and humiture detection.
Background technology
Lithium battery, because it has high-energy-density, long-life, low self-discharge rate, the advantage such as pollution-free, becomes rapidly the focus of modern hybrid electric vehicle research and development.Hybrid power is many between 300～400V to the requirement of battery tension, also has indivedual electric automobiles because the demand of power can make accumulator total voltage reach volt more than 500.General monolithic lithium battery is full of electricity for more than 3.32V, reach a few hectovolt power sources and need 100 multi-disc lithium battery monolithic series connection, lithium battery system reason due to various inside or outside in operational process may make the work of lithium battery monolithic occur extremely, thereby affect performance and the safety of whole lithium battery system, in order to ensure the normal work of lithium battery and assess its performance, reply operational factor is monitored in real time.In being applied to the process of hybrid power system, a lot of common factors can affect lithium battery work, and in the car body causing as, collision rugged by road surface, overturning etc., lithium battery vibration may cause battery system serviceability to be affected; Lithium battery group can form certain thermograde because of heating in the course of the work in battery case, can make the performance degradation of battery when excess Temperature, even burns battery; In lithium battery, the existence of moisture not only can cause the decomposition of lithium salts in lithium battery electrolytes and positive and negative pole material, collector are had to certain corrosion failure effect, and causing cycle performance of battery and security performance to reduce, the too high battery capacity that also can cause of hydrone decays.Therefore the detection of vibration state, humiture information is also very important part in the detection of lithium battery.
A kind of lithium battery distribution type detection method with vibration and humiture detection is as a kind of novel lithium battery group detection method, in traditional detection mode, not only added the detection of very important vibration and humiture but also in voltage detecting, made improvement, in traditional detection mode, take a plurality of battery cells as one group of composition battery module, measurement module voltage, general module voltage has about 20 volts (it is example that five battery cells of take form battery module), voltage is higher, generally need isolation just can output to next stage, this mode not only can not be concrete the performance of knowing every cell (can only know the performance of battery module), but also make detecting unit more complicated.
Summary of the invention
The object of this invention is to provide the lithium battery distribution type detection method that a kind of simple and reliable, band that extensibility is strong vibration and humiture detect, to overcome the deficiencies in the prior art.
In order to realize above object, the technical solution used in the present invention is:
A kind of lithium battery distribution type detection method with vibration and humiture detection, described method be take n(n<=16) the lithium battery monomer of sheet series connection measures as a detecting unit, each detecting unit detects each lithium battery monomer, it is characterized in that: described each detecting unit comprises: relay gating array, code translator gating unit, accurate reference voltage circuit, signal condition unit, toggle switch, Micro-processor MCV and vibration transducer module and Temperature Humidity Sensor module, the detection method of described detecting unit is: microcontroller only has 1 relay gating by any time in code translator pilot relay array, the input end Vin that the lithium battery monolithic voltage signal being strobed is sent into signal condition unit carries out voltage conditioning, the output end vo ut of signal condition unit changes by the inner A/D module of microcontroller, microcontroller passes through respectively I simultaneously
2c bus and I/O mouth obtain the information from vibration transducer and Temperature Humidity Sensor, and these information exchanges are crossed to CAN bus send to lithium battery bag main control unit, each detecting unit is identical, by toggle switch, be that each detecting unit arranges an indications that is used for doing CAN communication for No. ID, so that lithium battery bag main control unit can be distinguished the upper information of accepting of CAN, come from which detecting unit.
Described detecting unit adopts self-powered pattern, and its power supply is supplied with by the lithium battery of eight series connection, then utilizes power module to convert several required voltage grades to.
Described each detecting unit is measured the lithium battery monomer of n=16 sheet series connection, while detecting the lithium battery bag of being connected by m sheet monocell, adopts N=m/16 detecting unit.
The input end of described code translator is controlled by the I/O mouth of Micro-processor MCV respectively, and when code translator carries out 16 kinds of states switchings, the output terminal of code translator is output as low level successively, drives relay switch corresponding in relay array closed.
The detection of lithium battery monolithic voltage in described each detecting unit, use relay to realize battery cell is carried out to cycle detection, only gather at any time a slice lithium battery voltage, each detecting unit forms a relay array by 16 relays, the every corresponding relay of battery monomer, in each relay, contain two single relays, two single relays are controlled respectively the both positive and negative polarity of lithium battery monolithic, when relay is strobed, two single relay switches of its correspondence are closed, make respectively the positive pole of lithium battery monolithic connect conditioning unit input end, the minus earth of lithium battery monolithic.
The relay AQW214EHAZ that the both positive and negative polarity of above-mentioned every lithium battery contains two single relays by an inside controls, and microcontroller only has a relay J by controlling when code translator makes in relay array arbitrarily
i(i=1,2 ... 16) be strobed, input end A0, the A1 of code translator, A2, A3 are controlled by the I/O mouth of Micro-processor MCV respectively, when carrying out 16 kinds of states, A0, A1, A2, A3 from 0000 to 1111 switch, output terminal Y0～the Y15 of code translator is output as low level successively, connect+5V of light emitting diode positive pole in relay, negative pole connects decoder output, belongs to that low level drives, and Y0～Y15 drives corresponding relay J while being output as low level successively
i(i=1,2 ... 16) K switch (2i-1) and K2i(i=1,2 in ... 32) closure, makes the lithium battery monolithic minus earth that is strobed, and positive pole connects signal condition unit input end.Input end signal Vin receives the electrode input end of operational amplifier U4 in difference ratio amplifying circuit by a voltage follower, another side, the 4.096V voltage of+4.096V reference voltage source output is received the negative input of operational amplifier U4 in difference ratio amplifying circuit through a phase inverter, to raise the current potential of input voltage signal, to negative voltage signal is measured, output signal Vout after the amplitude limit output protection circuit that the output terminal of signal condition unit forms with stabilivolt through electric capacity is directly connected with the inside A/D modular converter of microcontroller, the inner A/D modular converter of MCU provides accurate reference voltage by+4.096V reference voltage source.
Described signal condition unit comprises the voltage follower that accurate rail-to-rail amplifier forms, voltage inverter and difference ratio amplifying circuit and precision resistance R1～R6, capacitor C 1～C2 and stabilivolt, wherein the input end of monolithic voltage signal is connected with the in-phase end of difference ratio amplifying circuit, accurate reference voltage is connected with the end of oppisite phase of difference ratio amplifying circuit through voltage inverter, its effect is lifting input voltage signal current potential, the output terminal of signal condition unit is provided with the amplitude limit output protection circuit of electric capacity and stabilivolt composition, in described signal condition unit for the accurate reference voltage of lifting input voltage signal from the reference voltage source for A/D conversion.
Compare with many battery testing systems of modern times, the present invention has introduced the detection of vibration signal and temperature-humidity signal, has strengthened the reliability of battery system application.In order to realize object, first adopted the acceleration transducer MMA7455L of freescale company to gather vibration signal, MMA7455L provides I
2c and SPI digital interface, this can be connected by master control synchronous serial port microcontroller with peripheral module.The microcontroller MCU of detecting unit passes through I
2after C bus obtains vibration signal, vibration signal is judged to classification (being divided into serious vibration and slight vibration).Secondly for the collection of humiture, adopt the AM2303 of Liao Aosong company, this is a digital integrated Temperature Humidity Sensor, and precision is high, does not need A/D converter, only need to be by simple I/O mouth to microcontroller transmission of information.
In addition, compare with traditional detection system, in this detection mode, adopt self-powered pattern, do not need Switching Power Supply to power to check-out console.What this detecting unit adopted is 24V power supply, with eight lithium battery monolithics, connects as power supply.Then utilize power module that 24V voltage transitions is become to needed each voltage gradation.
Owing to there being a lot of check-out consoles, and every check-out console is connected on CAN network and the information collecting sent to lithium battery bag main control unit with the form of similar parallel connection, lithium battery bag main control unit can receive by CAN network the information collecting from each check-out console.For the information that lithium battery main control unit can be distinguished collect on CAN network is from which check-out console, the toggle switch that has added one 5 on each check-out console, by toggle switch, each check-out console is numbered indications when this numbers as this check-out console CAN communication.The dial-up of toggle switch can carry out label to 31 fast check-out consoles from 00001～11111 successively.The signal that first can judge clearly to receive to the CAN net indications of transmitting terminal (check-out console) during CAN communication on lithium battery main control unit is from which piece check-out console.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is detecting unit self powered supply modular structure schematic diagram of the present invention.
Fig. 3 is detecting unit workflow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is done further and elaborated.
As shown in Figure 1, first detection system can be divided into two parts: lithium battery detecting unit and lithium battery main control unit, between these two parts, by CAN network, connect, check-out console gathers bottom data, then by CAN network, sends to lithium battery main control unit.
In described detecting unit, adopt self-powered pattern, as shown in Figure 2, using eight lithium battery monolithic series connection as power supply, about 3.3V when phosphate lithium battery monolithic voltage is normally worked, in charge and discharge process, the variation range of voltage is 3.0V～3.4V, eight lithium batteries voltage that is together in series is 24～27.2V, can it regard the power supply of about 24V as, then utilize power module that 24V power supply is converted to needed electric pressure, in this detecting unit required electric pressure be positive and negative 12V and+5V, so that adopt is become a full member negative 12V power module A2412S-1W and turn+5V of 24V power module B2405-2W of 24V.Consider that in CAN interface circuit, light need to separate every power supply, so adopted the power module of two turn+5V of 24V.
The present invention has adopted Distributed Detection method, and the 16 lithium battery monomers of take are measured as a detecting unit, and i detecting unit is to lithium battery monomer C
(16t+1)～C
(16t+16)(wherein t=i-1) detects, each detecting unit structure is identical, mainly comprises: relay gating array, code translator gating unit, accurate reference voltage circuit, signal condition unit, toggle switch, Micro-processor MCV and vibration transducer module and Temperature Humidity Sensor module.Unique difference is the ID difference of each detecting unit, and the toggle switch on detecting unit is once 00001,00010,00011,00100 ... being respectively detecting unit 1～N arranges ID(N and is generally less than 31).By No. ID, judgement, lithium battery main control unit can judge which detecting unit is the data that receive on CAN network come from.
Output terminal (K1, the K2 of the lithium battery monolithic in each detecting unit of the present invention and corresponding relay gating array ... K32) be connected, the input end light-emitting diodes tube cathode of relay gating array is connected with the output terminal of code translator.The input end of code translator is controlled by the I/O mouth of microcontroller, when carrying out 16 kinds of states, input end A0, A1, A2, the A3 from 0000 to 1111 of code translator switch, output terminal Y0～the Y15 of code translator is output as successively low level and drives corresponding relay J i(i=1,2 ... 16) K switch (2i-1) and K2i(i=1,2 in ... 32) closure, makes the lithium battery monolithic minus earth positive pole being strobed connect signal condition unit input end.Output any time of code translator only has one for low level, and this has just guaranteed that any time only has monolithic battery to detect online.The input end Vin that the voltage signal of the online monolithic battery detecting is sent into signal condition unit carries out voltage conditioning, has introduced a 4.096V reference voltage source with the current potential of lifting input signal, to measure the negative pressure value occurring because of fault in signal condition unit.The output end vo ut of signal condition unit is directly connected to the inside A/D module of microcontroller.That relay is selected is AQW214EHAZ, in each AQW214EHAZ, comprise two single relays, controlling respectively the both positive and negative polarity of lithium battery monolithic, due to each detecting unit detection is 16 battery monomers, so the code translator of selecting makes 4-16 line code translator 74HC154, what the resistance in signal condition unit adopted is essence resistance, to guarantee the accuracy of phase inverter and proportional difference circuit, consider that the input terminal voltage in signal condition power supply may surpass 5V, the amplifier of selecting is the accurate amplifier chip MAX479 that supply voltage can be greater than 5V, 4 operational amplifiers are contained in the inside, just meet the demand of 4 operational amplifiers in signal conditioning circuit, amplitude limit output protection circuit in signal condition unit adopts the stabilivolt of 5.1V, because the output through signal condition unit can not surpass 5V.The voltage reference adopting in inner A/D module is+4.096V to be provided by accurately+4.096V voltage source X60008ES8-41.
In the present invention, vibration transducer module has adopted the acceleration transducer MMA7455L of freescale company to gather vibration signal, and MMA7455L provides I
2c and SPI digital interface, this can be connected by master control synchronous serial port microcontroller with peripheral module.Temperature Humidity Sensor module adopts the AM2303 of Liao Aosong company, and this is a digital integrated Temperature Humidity Sensor, and precision is high, does not need A/D converter, only need to be by simple I/O mouth to microcontroller transmission of information.
Detecting unit of the present invention sends to lithium battery bag main control unit by the voltage signal collecting, vibration signal, temperature-humidity signal by CAN network, detecting unit with all need before CAN on main control unit is connected a CAN interface circuit, this interface circuit comprise light every with CAN transceiver.The light adopting in CAN interface circuit every be high-speed light every 6N137, CAN transceiver adopts be applied to automobile high speed field PCA82C250. this be current the most widely used CAN transceiver, support ISO---11898 standards.As seen from Figure 1, the I/O mouth that microcontroller need to be abundant, has inner A/D converter, I
2c bus, CAN bus, so the PIC18F258 of the MICROCHIP company that in detecting unit, microcontroller adopts.
Invention has been described for above combination most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain the various modifications of carrying out according to essence of the present invention, equivalent combinations.
Claims (5)
1. the lithium battery distribution type detection method with vibration and humiture detection, described method be take the lithium battery monomer of n sheet series connection and is measured as a detecting unit, each detecting unit detects each lithium battery monomer, described each detecting unit comprises: relay gating array, code translator gating unit, accurate reference voltage circuit, signal condition unit, toggle switch, Micro-processor MCV and vibration transducer module and Temperature Humidity Sensor module, the detection method of described detecting unit is: microcontroller only has 1 relay gating by any time in code translator pilot relay array, the lithium battery monolithic voltage signal being strobed is sent into the input end V of signal condition unit
incarry out voltage conditioning, the output terminal V of signal condition unit
outby the inner A/D module of microcontroller, change, microcontroller passes through respectively I simultaneously
2c bus and I/O mouth obtain the information from vibration transducer and Temperature Humidity Sensor, and these information exchanges are crossed to CAN bus send to lithium battery bag main control unit, described each detecting unit is identical, by toggle switch, be that each detecting unit arranges an indications that is used for doing CAN communication for No. ID, so that can distinguishing the upper information of accepting of CAN, lithium battery bag main control unit comes from which detecting unit, it is characterized in that, each detecting unit is measured the lithium battery monomer of n=16 sheet series connection, detection is during by the lithium battery bag of m sheet monocell series connection, adopt N=m/16 detecting unit, detection for lithium battery monolithic voltage in each detecting unit, use relay to realize battery cell is carried out to cycle detection, only gather at any time a slice lithium battery voltage, each detecting unit forms a relay array by 16 relays, the every corresponding relay of battery monomer, in each relay, contain two single relays, two single relays are controlled respectively the both positive and negative polarity of lithium battery monolithic, when relay is strobed, two single relay switches of its correspondence are closed, make respectively the positive pole of lithium battery monolithic connect conditioning unit input end, the minus earth of lithium battery monolithic.
2. as claimed in claim 1 a kind of with the lithium battery distribution type detection method of vibrating and humiture detects, it is characterized in that, signal condition unit comprises the voltage follower that accurate rail-to-rail amplifier forms, voltage inverter and difference ratio amplifying circuit and precision resistance R1～R6, capacitor C 1～C2 and stabilivolt, wherein the input end of monolithic voltage signal is connected with the in-phase end of difference ratio amplifying circuit, accurate reference voltage is connected with the end of oppisite phase of difference ratio amplifying circuit through voltage inverter, its effect is lifting input voltage signal current potential, the output terminal of signal condition unit is provided with the amplitude limit output protection circuit of electric capacity and stabilivolt composition, in described signal condition unit for the accurate reference voltage of lifting input voltage signal from the reference voltage source for A/D conversion.
3. as claimed in claim 1 a kind of with the lithium battery distribution type detection method of vibrating and humiture detects, it is characterized in that: what the detection of the vibration state that lithium battery occurs in application process adopted is that the MMA7455L of freescale company realizes, and MMA7455L provides I
2c and SPI digital interface.
4. as claimed in claim 3 a kind of with the lithium battery distribution type detection method of vibrating and humiture detects, it is characterized in that, the vibration signal that detecting unit microcontroller detects vibration transducer MMA7455L is analyzed and classification, when vibration is serious vibration, note vibration indications flag is 1, when being slight vibration, note vibration indications flag is 0.
5. as claimed in claim 1 a kind of with the lithium battery distribution type detection method of vibrating and humiture detects, it is characterized in that, the detection of lithium battery humiture adopts digital integrated Temperature Humidity Sensor AM2303, and its output signal is digital signal, is directly connected with the I/O mouth of microcontroller.
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| CN104007391A (en) * | 2014-04-29 | 2014-08-27 | 江苏华东锂电技术研究院有限公司 | Temperature and voltage monitoring system of lithium battery pack |
| US9673662B2 (en) | 2015-01-23 | 2017-06-06 | Motorola Mobility Llc | Battery disconnect safeguard |
| US9520746B2 (en) * | 2015-01-23 | 2016-12-13 | Motorola Mobility Llc | Battery disconnect safeguard |
| DE102015110185A1 (en) | 2015-06-24 | 2016-12-29 | Phoenix Contact Gmbh & Co. Kg | Measuring arrangement for detecting a malfunction of an energy storage device |
| CN106208221A (en) * | 2016-08-10 | 2016-12-07 | 合肥国盛电池科技有限公司 | Lithium battery group protection mechanism |
| CN108646185B (en) * | 2018-04-18 | 2020-11-20 | 广东松科智能科技有限公司 | New energy automobile power lithium battery performance detection and test method |
| CN108909480A (en) * | 2018-06-27 | 2018-11-30 | 长航集团芜湖江东船厂有限公司 | Ship charging pile |
| CN109581233B (en) * | 2018-12-29 | 2024-03-15 | 武汉理工大学 | Device for detecting positive and negative monolithic voltages of fuel cell and control method thereof |
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