CN102540101A - Integrated device for detecting high-pressure value and insulating resistance value of battery pack - Google Patents
Integrated device for detecting high-pressure value and insulating resistance value of battery pack Download PDFInfo
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- CN102540101A CN102540101A CN2012100529637A CN201210052963A CN102540101A CN 102540101 A CN102540101 A CN 102540101A CN 2012100529637 A CN2012100529637 A CN 2012100529637A CN 201210052963 A CN201210052963 A CN 201210052963A CN 102540101 A CN102540101 A CN 102540101A
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Abstract
The invention discloses an integrated device for detecting a high-pressure value and an insulating resistance value of a battery pack. The integrated device for detecting the high-pressure value and the insulating resistance value of the battery pack comprises a high-pressure signal regulating circuit, a resistance dividing network, an electronic switching matrix, a low-pressure signal regulating circuit, a gain-programmable fully-differential amplifying circuit, an ADC (analog-to-digital converter) sampling circuit, a digital isolating circuit and a singlechip system, wherein the resistance dividing network comprises a sampling circuit Rs1 and a sampling circuit Rs2; the electronic switching matrix comprises a switch K1, a switch K2 and a switch K3; the singlechip system performs time-shared control over the electronic switch K1 to be in a switched-on or switched-off state; voltage information of the sampling circuit Rs1 and the sampling circuit Rs2 are received by an SPI (serial peripheral interface) interface; and through voltage information computation, the high-pressure value or the insulating resistance value of the battery pack is obtained. The integrated device for detecting the high-pressure value and the insulating resistance value of the battery pack can realize two functions of the high-pressure detection and the insulating resistance detection of the battery pack within the same signal sampling circuit system, and is low in cost and high in detection precision.
Description
Technical field
The present invention relates to electronic technology field, more particularly, the present invention relates to a kind of electric battery high pressure and insulation resistance and detect integrated apparatus.
Background technology
In existing new-energy automobile and electrical network accumulator system, need adopt two cover Circuits System to accomplish respectively for the realization of detection of electric battery high pressure and insulation resistance measuring ability, make the electronic devices and components cost of total system significantly rise.
In existing electric battery high pressure detection system; The DC internal resistance of its input end mostly can not satisfy the requirement greater than 10M Ω; The electric battery high pressure not only can produce bigger power attenuation on resistance pressure-dividing network; Bring intrasystem heating problem, and the heating of resistance element can further have influence on the measuring accuracy of electric battery high pressure detection system.In addition, detection system suffers the influence of high-pressure system undesired signal (comprising EMI) under the vehicle running state easily, causes the measuring accuracy of detection system to reduce greatly, and the availability of detection system can be had a greatly reduced quality.
In view of this, necessary provide a kind of can be in same set of signal sample circuit system timesharing accomplish the electric battery high pressure and detect electric battery high pressure and the insulation resistance detection integrated apparatus that detects two parts function with insulation resistance.
Summary of the invention
The objective of the invention is to: provide a kind of electric battery high pressure and insulation resistance to detect integrated apparatus, its can be in same set of signal sample circuit system timesharing accomplish the electric battery high pressure and detect with insulation resistance and detect two parts function, cost is low, the measuring accuracy height.
In order to realize the foregoing invention purpose; The invention provides a kind of electric battery high pressure and insulation resistance and detect integrated apparatus, it comprises high-voltage signal modulate circuit, resistance pressure-dividing network, electronic switch switching matrix, low-voltage signal modulate circuit, gain programmable fully differential amplifying circuit, ADC sample circuit, digital buffer circuit and SCM system;
Said high-voltage signal modulate circuit comprises T mode filter Z1 and T mode filter Z2;
Said resistance pressure-dividing network comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, sampling resistor Rs1 and sampling resistor Rs2;
Said electronic switch switching matrix comprises K switch 1, K switch 2 and K switch 3;
Said low-voltage signal modulate circuit comprises filtering circuit Z3 and filtering circuit Z4;
Said gain programmable fully differential amplifying circuit comprises fully-differential amplifier A1, fully-differential amplifier A2, reference voltage N4 and reference source N5;
The positive pole of electric battery is connected with the input end of T mode filter Z1, and the negative pole of electric battery is connected with the input end of T mode filter Z2; Resistance R 1, resistance R 2, sampling resistor Rs1, sampling resistor Rs2, resistance R 3 and resistance R 4 are connected successively, and an end of the series circuit of being formed is connected with the output terminal of T mode filter Z1, and the other end is connected with the output terminal of T mode filter Z2; One end of K switch 1 is connected on the tie point of sampling resistor Rs1 and sampling resistor Rs2, and the other end connects casing; K switch 2 is connected the two ends of resistance R 2; K switch 3 is connected the two ends of resistance R 3;
After the voltage signal at sampling resistor Rs1 two ends carries out filtering via filtering circuit Z3, be sent to fully-differential amplifier A1 and carry out the fully differential amplification, import the ADC sample circuit again and carry out analog to digital conversion, at last through SPI passage input SCM system;
After the voltage signal at sampling resistor Rs2 two ends carries out filtering via filtering circuit Z4, be sent to fully-differential amplifier A2 and carry out the fully differential amplification, import the ADC sample circuit again and carry out analog to digital conversion, at last through SPI passage input SCM system;
Said digital buffer circuit is arranged on the SPI passage between said ADC sample circuit and the said SCM system, and the SPI communication is isolated on electric;
Said SCM system timesharing CS K1 is in conducting or off state, receives the magnitude of voltage information on sampling resistor Rs1 and the sampling resistor Rs2 through the SPI passage, obtains the high-voltage value or the insulating resistance value of electric battery according to said magnitude of voltage information calculations.
A kind of improvement as electric battery high pressure of the present invention and insulation resistance detection integrated apparatus; Said SCM system transmits control signal to K switch 2, K switch 3; CS K2, K switch 3 are in conducting or off state, adjust the voltage attenuation ratio of said resistance pressure-dividing network.
As a kind of improvement of electric battery high pressure of the present invention and insulation resistance detection integrated apparatus, sampling resistor Rs1 and sampling resistor Rs2 are sampling with high precision resistance.
With respect to prior art, electric battery high pressure of the present invention and insulation resistance detect integrated apparatus and have following beneficial effect:
(1) detection of the high pressure of electric battery and insulation resistance detect shared same set of pick-up unit, can reduce total system electronic devices and components material cost greatly;
(2) adopt in the high-voltage signal modulate circuit through the T of adjustment mode filter, effectively the undesired signal (containing EMI) of filtering automobile high-pressure system generation in the process of moving;
(3) gain programmable fully differential amplifying circuit is adopted in the detection of low-voltage signal, even near the microvolt level signal the ground wire also can truly detect;
(4) (R1～R4) and sampling resistor value (Rs1, Rs2) can satisfy the applicable cases of different battery voltages, and the electric battery ceiling voltage can reach 1000V through changing resistance values different in the resistance pressure-dividing network;
(5) the electric battery high pressure detects and the insulation resistance detection method meets the relevant regulations of domestic and international industry standard, and its measuring accuracy all satisfies request for utilization, and in practical application, has obtained checking.
Description of drawings
Below in conjunction with accompanying drawing and embodiment, electric battery high pressure of the present invention and insulation resistance are detected integrated apparatus and useful technique effect is elaborated, wherein:
Fig. 1 is the structural representation that electric battery high pressure of the present invention and insulation resistance detect first embodiment of integrated apparatus.
Fig. 2 is the structural representation that electric battery high pressure of the present invention and insulation resistance detect second embodiment of integrated apparatus.
Fig. 3 is the structural representation that electric battery high pressure of the present invention and insulation resistance detect the 3rd embodiment of integrated apparatus.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the technical scheme of electric battery high pressure of the present invention and insulation resistance detection integrated apparatus is carried out clear, complete description.Need to prove that the embodiment of describing in this instructions only is a part embodiment of the present invention, and not all embodiments.Based on the embodiment that provides among the present invention, those skilled in the art is not passing through the every other embodiment that obtains under the prerequisite of creative work, all belongs to the scope of the present invention's protection.
Seeing also shown in Figure 1ly, is the structural representation that electric battery high pressure of the present invention and insulation resistance detect first embodiment of integrated apparatus.
Electric battery high pressure that first embodiment of the invention provides and insulation resistance detect integrated apparatus, comprise high-voltage signal modulate circuit, resistance pressure-dividing network, electronic switch switching matrix, low-voltage signal modulate circuit, gain programmable fully differential amplifying circuit, ADC sample circuit, digital buffer circuit and SCM system.Specific as follows:
The high-voltage signal modulate circuit comprises T mode filter Z1 and T mode filter Z2;
Resistance pressure-dividing network comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, sampling resistor Rs1 and sampling resistor Rs2;
The electronic switch switching matrix comprises K switch 1, K switch 2 and K switch 3;
The low-voltage signal modulate circuit comprises filtering circuit Z3 and filtering circuit Z4;
Gain programmable fully differential amplifying circuit comprises fully-differential amplifier A1, fully-differential amplifier A2, reference voltage N4 and reference source N5;
The positive pole of electric battery is connected with the input end of T mode filter Z1, and the negative pole of electric battery is connected with the input end of T mode filter Z2; Resistance R 1, resistance R 2, sampling resistor Rs1, sampling resistor Rs2, resistance R 3 and resistance R 4 are connected successively, and an end of the series circuit of being formed is connected with the output terminal of T mode filter Z1, and the other end is connected with the output terminal of T mode filter Z2; One end of K switch 1 is connected on the tie point of sampling resistor Rs1 and sampling resistor Rs2, and the other end connects casing; K switch 2 is connected the two ends of resistance R 2; K switch 3 is connected the two ends of resistance R 3;
After the voltage signal at sampling resistor Rs1 two ends carries out filtering via filtering circuit Z3, be sent to fully-differential amplifier A1 and carry out the fully differential amplification, import the ADC sample circuit again and carry out analog to digital conversion, at last through SPI passage input SCM system;
After the voltage signal at sampling resistor Rs2 two ends carries out filtering via filtering circuit Z4, be sent to fully-differential amplifier A2 and carry out the fully differential amplification, import the ADC sample circuit again and carry out analog to digital conversion, at last through SPI passage input SCM system;
The numeral buffer circuit is arranged on the SPI passage between ADC sample circuit and the SCM system, and the SPI communication is isolated on electric;
SCM system timesharing CS K1 is in conducting or off state, receives the magnitude of voltage information on sampling resistor Rs1 and the sampling resistor Rs2 through the SPI passage, obtains the high-voltage value or the insulating resistance value of electric battery according to said magnitude of voltage information calculations.
Further, SCM system transmits control signal to K switch 2, K switch 3, and CS K2, K switch 3 are in conducting or off state, adjusts the voltage attenuation ratio of said resistance pressure-dividing network.
Fig. 1 is the way circuit figure that detection of electric battery high pressure and insulation resistance detect integrated apparatus; T mode filter Z1 and T mode filter Z2 form the high-voltage signal modulate circuit; Through the adjustment related parameter values, the undesired signal (containing EMI) that can the filtering automobile produces in driving process mesohigh system.Resistance R 1～R4, sampling resistor Rs1 and sampling resistor Rs2 form resistance pressure-dividing network, decay into a less magnitude of voltage to the high-voltage value of electric battery through resistance pressure-dividing network, are convenient to the identification of rear end ADC sample circuit.Preferably, sampling resistor Rs1 and sampling resistor Rs2 are high precision film sampling resistor, adopt " Kelvin " connected mode.In the electronic switch switching matrix, K switch 1 is accomplished the switching of detection of electric battery high pressure and insulation resistance measuring ability, the switching of K switch 2 and K switch 3 completion testing ranges.Low-voltage signal modulate circuit (filtering circuit Z3, filtering circuit Z4) and gain programmable fully differential amplifying circuit (fully-differential amplifier A1, fully-differential amplifier A2, reference voltage N4 and reference source N5) are accomplished conditioning and the enlarging function that carries out microvolt level signal, and in the single power supply system, realize the fully differential enlarging function.Wherein, ADC sample circuit N1 is 24 high-precision a/d converters, can guarantee high-precision signal sampling.Numeral buffer circuit N2 accomplishes the isolation features of SPI communication on electric, also comprises the buffer circuit of power supply simultaneously, thereby makes and on electric, isolate fully between electric battery high-pressure system and the single-chip microcomputer low-pressure system.SCM system N3 transmits test data through the SPI communication, converses the high-voltage value and the insulating resistance value of corresponding electric battery, and accomplishes data analysis and processing capacity.
Below in conjunction with Fig. 2 and shown in Figure 3, the high-voltage value of electric battery of the present invention and the detection method of insulating resistance value are elaborated.
Seeing also shown in Figure 2ly, is the structural representation that electric battery high pressure provided by the invention and insulation resistance detect second embodiment of integrated apparatus.
The equivalent circuit diagram that Fig. 2 detects for the electric battery high pressure, in electric battery high pressure testing process, electronic switch K1 is in off-state all the time in the SCM system N3 control chart 1.After the electric battery high-voltage value passes through T mode filter and resistance pressure-dividing network; Can produce the voltage drop of corresponding ratio at two sampling resistors (sampling resistor Rs1 and sampling resistor Rs2) two ends; The single-chip microcomputer sampling system of rear end promptly can be converted into corresponding electric battery high-voltage value through the magnitude of voltage on two sampling resistors of accurately sampling.
Through conducting and the shutoff of SCM system N3 control electronic switch K2 and K3, can adjust the attenuation ratio of resistance pressure-dividing network, thereby satisfy the sampling with high precision requirement of battery voltage when low side.
Seeing also shown in Figure 3ly, is the structural representation that electric battery high pressure provided by the invention and insulation resistance detect the 3rd embodiment of integrated apparatus.
The equivalent circuit diagram that Fig. 3 detects for the electric battery insulation resistance.In electric battery insulation resistance testing process; Electronic switch K1 is in closure state all the time in the SCM system N3 control chart 1; Through the method for SCM system N3 according to insulation resistance detection among the GB GB/T 18384.1-2001; Conducting and the shutoff of control electronic switch K2 and electronic switch K3, thus draw the mathematical equations of organizing more, calculate the insulating resistance value RN of electric battery high pressure anode respectively to the insulating resistance value RP of casing and electric battery high pressure negative terminal to casing.According to the size of these two insulating resistance values, can judge in the current electric battery high-pressure system whether have the high-voltage safety problem, and in time make corresponding processing through the high voltage control strategy of agreement, ensure safety of person vehicle.
With respect to prior art; Electric battery high pressure of the present invention and insulation resistance detect integrated apparatus and have following technique effect: can be in same set of signal sample circuit system timesharing accomplish the electric battery high pressure and detect and insulation resistance detection two parts function, reduced cost; In the high-voltage signal modulate circuit, adopt the undesired signal (containing EMI) of coming the high-pressure system generation in the process of moving of filtering automobile through the T of adjustment mode filter, improved measuring accuracy; In addition, in gain programmable fully differential amplifying circuit,, realized real fully differential enlarging function in the single power supply system through to the reference source efficient processing of signal.
According to the announcement and the instruction of above-mentioned instructions, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned embodiment.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection domain of claim of the present invention modifications more of the present invention and change.In addition, although used some specific terms in this instructions, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (3)
1. electric battery high pressure and insulation resistance detect integrated apparatus; It is characterized in that, comprise high-voltage signal modulate circuit, resistance pressure-dividing network, electronic switch switching matrix, low-voltage signal modulate circuit, gain programmable fully differential amplifying circuit, ADC sample circuit, digital buffer circuit and SCM system;
Said high-voltage signal modulate circuit comprises T mode filter Z1 and T mode filter Z2;
Said resistance pressure-dividing network comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, sampling resistor Rs1 and sampling resistor Rs2;
Said electronic switch switching matrix comprises K switch 1, K switch 2 and K switch 3;
Said low-voltage signal modulate circuit comprises filtering circuit Z3 and filtering circuit Z4;
Said gain programmable fully differential amplifying circuit comprises fully-differential amplifier A1, fully-differential amplifier A2, reference voltage N4 and reference source N5;
The positive pole of electric battery is connected with the input end of T mode filter Z1, and the negative pole of electric battery is connected with the input end of T mode filter Z2; Resistance R 1, resistance R 2, sampling resistor Rs1, sampling resistor Rs2, resistance R 3 and resistance R 4 are connected successively, and an end of the series circuit of being formed is connected with the output terminal of T mode filter Z1, and the other end is connected with the output terminal of T mode filter Z2; One end of K switch 1 is connected on the tie point of sampling resistor Rs1 and sampling resistor Rs2, and the other end connects casing; K switch 2 is connected the two ends of resistance R 2; K switch 3 is connected the two ends of resistance R 3;
After the voltage signal at sampling resistor Rs1 two ends carries out filtering via filtering circuit Z3, be sent to fully-differential amplifier A1 and carry out the fully differential amplification, import the ADC sample circuit again and carry out analog to digital conversion, at last through SPI passage input SCM system;
After the voltage signal at sampling resistor Rs2 two ends carries out filtering via filtering circuit Z4, be sent to fully-differential amplifier A2 and carry out the fully differential amplification, import the ADC sample circuit again and carry out analog to digital conversion, at last through SPI passage input SCM system;
Said digital buffer circuit is arranged on the SPI passage between said ADC sample circuit and the said SCM system, and the SPI communication is isolated on electric;
Said SCM system timesharing CS K1 is in conducting or off state, receives the magnitude of voltage information on sampling resistor Rs1 and the sampling resistor Rs2 through the SPI passage, obtains the high-voltage value or the insulating resistance value of electric battery according to said magnitude of voltage information calculations.
2. electric battery high pressure according to claim 1 and insulation resistance detect integrated apparatus; It is characterized in that; Said SCM system transmits control signal to K switch 2, K switch 3; CS K2, K switch 3 are in conducting or off state, adjust the voltage attenuation ratio of said resistance pressure-dividing network.
3. electric battery high pressure according to claim 1 and 2 and insulation resistance detect integrated apparatus, it is characterized in that sampling resistor Rs1 and sampling resistor Rs2 are sampling with high precision resistance.
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| CN2012100529637A CN102540101A (en) | 2012-03-01 | 2012-03-01 | Integrated device for detecting high-pressure value and insulating resistance value of battery pack |
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| CN2012100529637A CN102540101A (en) | 2012-03-01 | 2012-03-01 | Integrated device for detecting high-pressure value and insulating resistance value of battery pack |
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| CN102798807A (en) * | 2012-08-10 | 2012-11-28 | 宁德新能源科技有限公司 | Insulation detection system capable of performing redundant allocation |
| CN102798808A (en) * | 2012-08-10 | 2012-11-28 | 宁德新能源科技有限公司 | Insulation detection system |
| CN103454498A (en) * | 2013-08-08 | 2013-12-18 | 许继集团有限公司 | Insulation detection method of electric vehicle power battery pack |
| CN103576044A (en) * | 2012-07-18 | 2014-02-12 | 株式会社京滨 | Electric leakage detecting apparatus |
| CN103605056A (en) * | 2013-11-20 | 2014-02-26 | 奇瑞汽车股份有限公司 | High-voltage DC insulation monitoring device and electric automobile |
| CN103884911A (en) * | 2012-12-20 | 2014-06-25 | 北汽福田汽车股份有限公司 | Electric automobile high-voltage insulation monitoring device |
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| CN103353581B (en) * | 2013-06-25 | 2015-10-21 | 安徽力高新能源技术有限公司 | A kind of high-voltage state combination detection device for battery |
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