CN102928789A - 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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- CN102928789A CN102928789A CN201210438186XA CN201210438186A CN102928789A CN 102928789 A CN102928789 A CN 102928789A CN 201210438186X A CN201210438186X A CN 201210438186XA CN 201210438186 A CN201210438186 A CN 201210438186A CN 102928789 A CN102928789 A CN 102928789A
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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 becomes rapidly the focus of modern PHEV research and development because it has high-energy-density, long-life, low self-discharge rate, the advantage such as pollution-free.Hybrid power is many between 300～400V to the requirement of battery tension, indivedual electric automobiles is also arranged because the demand of power can make the accumulator total voltage reach volt more than 500.General monolithic lithium battery is full of electricity for more than the 3.32V, reach a few hectovolt power sources and need the series connection of 100 multi-disc lithium battery monolithics, lithium battery system reason owing to various inside or outside in operational process may make the work of lithium battery monolithic occur unusually, thereby affect performance and the safety of whole lithium battery system, in order to ensure the normal operation of lithium battery and assess its performance, the reply operational factor is carried out Real Time Monitoring.In being applied to the process of hybrid power system, a lot of common factors can affect lithium battery work, and the lithium battery vibration may cause the battery system serviceability to be affected in the car body that causes such as, collision rugged by the road surface, overturning etc.; The 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 burn battery; The existence of moisture not only can cause the decomposition of lithium salts in the lithium battery electrolytes and positive and negative pole material, collector are had certain corrosion failure effect in the lithium battery, 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 also is 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 add the detection of very important vibration and humiture but also made improvement in voltage detecting, form battery module take a plurality of battery cells as one group in the traditional detection mode, measurement module voltage, general module voltage has (take five battery cells composition battery modules as example) about 20 volts, 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 purpose 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 purpose, 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 is 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, the code translator gating unit, the accurate reference voltage circuit, the 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 the code translator pilot relay array, the input end Vin that the lithium battery monolithic voltage signal that is strobed is sent into the signal condition unit carries out the voltage conditioning, the output end vo ut of signal condition unit changes by the inner A/D module of microcontroller, and 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 the CAN bus send to lithium battery bag main control unit, each detecting unit is identical, for each detecting unit an indications that is used for doing the CAN communication for ID number is set by toggle switch, comes from which detecting unit so that lithium battery bag main control unit can be distinguished the upper information of accepting of CAN.
Described detecting unit adopts the 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, when detecting the lithium battery bag of being connected by m sheet monocell, adopts N=m/16 detecting unit.
By the I/O mouth control of Micro-processor MCV, when code translator carried out 16 kinds of states switchings, the output terminal of code translator was output as low level to the input end of described code translator successively respectively, and it is closed to drive relay switch corresponding in the relay array.
The detection of lithium battery monolithic voltage in described each detecting unit, use relay to realize battery cell is carried out cycle detection, only gather at any time a slice lithium battery voltage, each detecting unit forms a relay array by 16 relays, every corresponding relay of battery monomer, contain two single relays in each relay, 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 the conditioning unit input end, the minus earth of lithium battery monolithic.
The both positive and negative polarity of above-mentioned every lithium battery contains the relay AQW214EHAZ control of two single relays by an inside, and microcontroller only has a relay J when making in the relay array arbitrarily by the control code translator
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, the light emitting diode positive pole connects+5V in the relay, negative pole connects decoder output, belongs to that low level drives, and drives corresponding relay J when Y0～Y15 is 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 the 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 the difference ratio amplifying circuit through a phase inverter; to raise the current potential of input voltage signal; in order 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 through electric capacity and stabilivolt directly links to each other with the inside A/D modular converter of microcontroller, and MCU inside A/D modular converter provides accurate reference voltage by+4.096V reference voltage source.
Described signal condition unit comprises the voltage follower that accurate rail-to-rail amplifier consists of; 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, is used for the accurate reference voltage of lifting input voltage signal in the described signal condition unit from the reference voltage source that is used for the 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 that battery system is used.In order to realize purpose, at first adopted the acceleration transducer MMA7455L of freescale company to gather vibration signal, MMA7455L provides I
2C and SPI digital interface, this can link to each other by the master control synchronous serial port microcontroller with peripheral module.The microcontroller MCU of detecting unit passes through I
2The C bus obtains after the vibration signal, and vibration signal is judged classification (being divided into serious vibration and slight vibration).Secondly adopted the AM2303 of Ao Song company for the collection of humiture, this is a digital integrated Temperature Humidity Sensor, and precision is high, does not need A/D converter, only needs by simple I/O mouth to the microcontroller transmission of information.
In addition, compare with traditional detection system, adopt the self-powered pattern in this detection mode, do not need Switching Power Supply that check-out console is powered.What this detecting unit adopted is the 24V power supply, connects as power supply with eight lithium battery monolithics.Then utilize power module that the 24V voltage transitions is become needed each voltage gradation.
Because a lot of check-out consoles are arranged, and every check-out console is connected on the CAN network with the form of similar parallel connection the information that collects sent to lithium battery bag main control unit, and lithium battery bag main control unit can receive the information that collects from each check-out console by the CAN network.For the information that the lithium battery main control unit can be distinguished collect on the CAN network from which check-out console, the toggle switch that has added one 5 on each check-out console, each check-out console is numbered the indications when this numbers as this check-out console CAN communication by toggle switch.The dial-up of toggle switch can carry out label to 31 fast check-out consoles from 00001～11111 successively.Any at first can judge with the signal that clearly receives from piece check-out console the CAN net indications of transmitting terminal (check-out console) during the CAN communication on the lithium battery main control unit.
Description of drawings
Fig. 1 is one-piece construction synoptic diagram of the present invention.
Fig. 2 is detecting unit self powered supply modular structure synoptic 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 to elaborate.
As shown in Figure 1, at first detection system can be divided into two parts: lithium battery detecting unit and lithium battery main control unit, connect by the CAN network between these two parts, check-out console gathers bottom data, then sends to the lithium battery main control unit by the CAN network.
Adopt the self-powered pattern in the described detecting unit, as shown in Figure 2, eight lithium battery monolithics are connected as power supply, about 3.3V during the normal operation of phosphate lithium battery monolithic voltage, the variation range of voltage is 3.0V～3.4V in the charge and discharge process, 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 the 24V power supply is converted to needed electric pressure, in this detecting unit required electric pressure be positive and negative 12V and+5V, so what adopt is that become a full member negative 12V power module A2412S-1W and 24V of 24V turns+5V power module B2405-2W.Consider that light need to separate every power supply in the CAN interface circuit, so adopted two 24V to turn+power module of 5V.
The present invention has adopted the Distributed Detection method, measures as a detecting unit take 16 lithium battery monomers, 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 the detecting unit once is 00001,00010,00011,00100 ... being respectively detecting unit 1～N arranges ID(N and is generally less than 31).By judging the lithium battery main control unit can judge which detecting unit is the data that receive on the CAN network come from ID number.
Output terminal (K1, the K2 of the lithium battery monolithic in each detecting unit of the present invention and corresponding relay gating array ... K32) link to each other, 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 by the I/O mouth control 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 that is strobed connect signal condition unit input end.Output any time of code translator only has one to be 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 that detects is sent into the signal condition unit carries out the voltage conditioning, introduced a 4.096V reference voltage source with the current potential of lifting input signal in the signal condition unit, in order to measure the negative pressure value that barrier for some reason occurs.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; comprise two single relays among each AQW214EHAZ; controlling respectively the both positive and negative polarity of lithium battery monolithic; because what each detecting unit detected is 16 battery monomers; so the code translator of selecting makes 4-16 line code translator 74HC154; what the resistance in the signal condition unit adopted is smart resistance; to guarantee the accuracy of phase inverter and proportional difference circuit; consider that the input terminal voltage in the signal condition power supply may surpass 5V; the amplifier of selecting is that supply voltage can be greater than the accurate amplifier chip MAX479 of 5V; 4 operational amplifiers are contained in the inside; just satisfy the demand of 4 operational amplifiers in the signal conditioning circuit; amplitude limit output protection circuit in the signal condition unit adopts the stabilivolt of 5.1V to get final product, because can not surpass 5V through the output of signal condition unit.The voltage reference that adopts in the inner A/D module is+4.096V, by accurately+4.096V voltage source X60008ES8-41 provides.
The vibration transducer module has adopted the acceleration transducer MMA7455L of freescale company to gather vibration signal among the present invention, and MMA7455L provides I
2C and SPI digital interface, this can link to each other by the master control synchronous serial port microcontroller with peripheral module.The Temperature Humidity Sensor module has adopted the AM2303 of Ao Song company, and this is a digital integrated Temperature Humidity Sensor, and precision is high, does not need A/D converter, only needs by simple I/O mouth to the microcontroller transmission of information.
Detecting unit of the present invention sends to lithium battery bag main control unit with voltage signal, vibration signal, the temperature-humidity signal that collects by the CAN network, all need before CAN that detecting unit is connected with main control unit connects a CAN interface circuit, this interface circuit comprise light every with the CAN transceiver.The light that in the CAN interface circuit, adopts every be high-speed light every 6N137, the CAN transceiver adopts be applied to automobile high speed field PCA82C250. this be present the most widely used CAN transceiver, support ISO---11898 standards.As seen from Figure 1, the I/O mouth that microcontroller need to enrich has inner A/D converter, I
2C bus, CAN bus, so the PIC18F258 of the MICROCHIP company that microcontroller adopts in the detecting unit.
Above invention has been described in conjunction with most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (9)
1. lithium battery distribution type detection method with vibration and humiture detection, described method is measured take the lithium battery monomer of n sheet series connection 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, the code translator gating unit, the accurate reference voltage circuit, the 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 the code translator pilot relay array, the input end Vin that the lithium battery monolithic voltage signal that is strobed is sent into the signal condition unit carries out the voltage conditioning, the output end vo ut of signal condition unit changes by the inner A/D module of microcontroller, and 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 the CAN bus send to lithium battery bag main control unit, described each detecting unit is identical, for each detecting unit an indications that is used for doing the CAN communication for ID number is set by toggle switch, comes from which detecting unit so that lithium battery bag main control unit can be distinguished the upper information of accepting of CAN.
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, detecting unit adopts the 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.
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, each detecting unit is measured the lithium battery monomer of n=16 sheet series connection, when detecting the lithium battery bag of being connected by m sheet monocell, adopts N=m/16 detecting unit.
4. such as claim 1 or 3 described a kind of lithium battery distribution type detection methods with vibration and humiture detection, it is characterized in that, the input end of described code translator is controlled by the I/O mouth of Micro-processor MCV respectively, when code translator carries out 16 kinds of states switchings, the output terminal of code translator is output as low level successively, and it is closed to drive relay switch corresponding in the relay array.
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, detection for lithium battery monolithic voltage in each detecting unit, use relay to realize battery cell is carried out cycle detection, only gather at any time a slice lithium battery voltage, each detecting unit forms a relay array by 16 relays, every corresponding relay of battery monomer, contain two single relays in each relay, 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 the conditioning unit input end, the minus earth of lithium battery monolithic.
6. 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 signal condition unit comprises the voltage follower that accurate rail-to-rail amplifier consists of; 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, is used for the accurate reference voltage of lifting input voltage signal in the described signal condition unit from the reference voltage source that is used for the A/D conversion.
7. 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 was adopted is that the MMA7455L of freescale company realizes that MMA7455L provides I
2C and SPI digital interface.
8. as claimed in claim 7 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 the detecting unit microcontroller detects vibration transducer MMA7455L is analyzed and classification, when vibration is serious vibration, note vibration indications flag is 1, and when being slight vibration, note vibration indications flag is 0.
9. 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, digital integrated Temperature Humidity Sensor AM2303 is adopted in the detection of lithium battery humiture, and its output signal is digital signal, directly links to each other with the I/O mouth of microcontroller.
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| WO2015165147A1 (en) * | 2014-04-29 | 2015-11-05 | 江苏华东锂电技术研究院有限公司 | Lithium battery pack temperature and voltage monitoring system |
| CN105824387A (en) * | 2015-01-23 | 2016-08-03 | 摩托罗拉移动有限责任公司 | Battery Disconnect Safeguard |
| 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 |
| CN108646185A (en) * | 2018-04-18 | 2018-10-12 | 广东松科智能科技有限公司 | A kind of new-energy automobile dynamic lithium battery performance detection 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 |
| CN109581233A (en) * | 2018-12-29 | 2019-04-05 | 武汉理工大学 | Detect the device and its control method of the positive and negative monolithic voltage of fuel cell |
| US10397875B2 (en) | 2015-01-23 | 2019-08-27 | Motorola Mobility Llc | Battery disconnect safeguard |
| US10914767B2 (en) | 2015-06-24 | 2021-02-09 | Phoenix Contact Gmbh & Co. Kg | Measuring arrangement for identifying a malfunction of an energy accumulator assembly |
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