CN103675705A - Method for redundancy check of currents of power battery - Google Patents

Method for redundancy check of currents of power battery Download PDF

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Publication number
CN103675705A
CN103675705A CN201310674286.7A CN201310674286A CN103675705A CN 103675705 A CN103675705 A CN 103675705A CN 201310674286 A CN201310674286 A CN 201310674286A CN 103675705 A CN103675705 A CN 103675705A
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China
Prior art keywords
current
currents
data
shunt
value
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Pending
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CN201310674286.7A
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Chinese (zh)
Inventor
刘飞
文锋
阮旭松
余祖俊
盛大双
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Huizhou Epower Electronics Co Ltd
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Huizhou Epower Electronics Co Ltd
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Priority to CN201310674286.7A priority Critical patent/CN103675705A/en
Publication of CN103675705A publication Critical patent/CN103675705A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a method for redundancy check of currents of a power battery. The method comprises the steps that a battery management system monitors currents of a system; signal collection is carried out on a shunt at intervals of the time T; signal data obtained through collection are processed; comparison and check are carried out on the two sets of processed current data, when a difference between values of the two sets of current data is larger than a preset difference, the next step of operation is executed, when the difference between the two sets of current data is no larger than the preset difference, the smaller value is selected as the current value at present, and the first step is executed again; when the situation that current detection has a fault is determined, the battery management system reports fault information to a system-level controller, and the first step is executed again. Compared with the prior art, the method for redundancy check of the currents of the power battery has the advantages that the double-section type shunt provides support for redundancy detection of the currents, and provides feasibility for achieving synchronous sampling of current signals; on-line fault diagnosis can be achieved, and when the abnormal situation of the currents happens, the abnormal situation can be timely identified; reliability of current detection can be ensured.

Description

A kind of current redundant method of calibration of electrokinetic cell
Technical field
The present invention relates to automobile power cell current detecting field, specifically a kind of current redundant method of calibration of electrokinetic cell.
Background technology
Present stage, electrokinetic cell or energy-storage battery system be the supporting installation battery management system of meeting generally, and all possesses the monitoring acquisition function to battery system charging and discharging currents.For electrokinetic cell or energy-storage battery system, all need to measure the charging and discharging currents of the system of battery, and according to measured electric current, complete ampere-hour integration, overcurrent judgement and data monitoring.
Traditional battery management system or be all to adopt single-sensor and the testing circuit supporting with it to complete current acquisition to the electric current of electrokinetic cell system charging and discharging currents watch-dog, when there is deviation or losing efficacy in current detecting, checkout equipment is difficult to identification automatically, when only having the manual maintenance of waiting until, could find.Especially electric automobile time, the inefficacy meeting of electric current even can cause the generation of car accident.
At present numerous solutions adopts shunt or Hall element to complete current acquisition.Shunt is the resistance of high precision, little resistance, and testing circuit, by gathering the voltage at resistance two ends, calculates charging and discharging currents by Ohm law.Hall element is to utilize Hall effect, and testing circuit, by gathering the voltage signal of Hall output, calculates charging and discharging currents according to Hall effect equivalent relation.These two kinds of sensors are all generally independently individual, and the testing circuit that it is adopted is also a set of independent circuits, to the process of the detection of electric current, is an open loop detection system, the assurance dependence of reliability and the reliability of electronic devices and components and circuit arrangement.If losing efficacy appears in sensor or testing circuit, (detect inaccurate, the situation such as be interfered), battery management system is cannot this type of failure phenomenon of ONLINE RECOGNITION, also just cannot start corresponding counter-measure, cause that overcurrent false alarm, parameter monitoring are inaccurate, ampere-hour meter is not calculated accurately, affect SOC estimation, SOH estimation, mileage and estimate.Therefore, the reliability of the detection of electric current is being related to the reliable and safe operation of system (electric automobile, energy-accumulating power station etc.).
Summary of the invention
For above-mentioned prior art, the technical problem to be solved in the present invention is: a kind of current redundant method of calibration of electrokinetic cell is provided, guarantees the detecting reliability of electric current, and support real-time online fault diagnosis.
In order to address the above problem, the current redundant method of calibration of electrokinetic cell of the present invention is
S1: battery management system is monitored the electric current of monitored system;
S2: shunt is carried out to signals collecting one time every time T, obtain two groups of data;
S3: the signal data collecting is processed, obtained two groups of real-time current values;
S4: two groups of current data after processing are contrasted to verification, when the difference of two groups of current data surpasses preset difference value, carry out next step operation, if do not surpass preset difference value, choose smaller value as current current value and return to step S1;
S5: be judged as current detecting and break down, battery management system is by fault information reporting system-level controller and return to step S1.
Preferably, described shunt is six line systems.
Preferably, in described step S3, the treatment step of signal data is obtained according to ohm law.
Preferably, described image data interval time T with for the preset difference value contrasting, be the storage unit that pre-sets and be stored in battery management system.
Compared with prior art, tool of the present invention has the following advantages: one, two section type shunt has improved traditional single resistance-type shunt, for current redundant detects, provides support, for the synchronized sampling of current signal provides the feasibility realizing; Two, to gathered current signal, can realize on-line fault diagnosis, when there is current anomaly, can identify in time; Three, redundant detecting method, can guarantee the reliability of detected electric current.
Accompanying drawing explanation
Fig. 1 is the connecting circuit figure of the current redundant method of calibration of electrokinetic cell of the invention process.
Fig. 2 is the current redundant method of calibration process flow diagram of electrokinetic cell of the invention process.
Embodiment
In order to allow those skilled in the art understand better technical scheme of the present invention, below in conjunction with accompanying drawing, the present invention is further elaborated.
The specific embodiment of the present invention: a kind of current redundant method of calibration of electrokinetic cell, the method is applied to circuit connection structure in battery management system as shown in Figure 1.This circuit comprise tandem type power battery pack 1, be connected on the shunt 2 before power battery pack and gather by current signal the battery management system 4 that line 3 is connected with shunt.Wherein, battery management system comprises the first current detection circuit 51 and the second current detection circuit 52 being connected with shunt, for the treatment of the data-signal collecting; The MCU circuit unit 6 being connected with two-way current detection circuit, for carrying out data acquisition and controlling processing; And other interlock circuit unit 7 that are connected with MCU circuit unit.
Wherein, the shunt of measuring electric current is two section type design, and according to the needs of range, the resistance of this shunt of two sections can be the same, also can be different; This shunt is an integral body, be not by two independently shunt connect; This shunt is six line systems, and wherein 4 lines and traditional shunt function are in full accord, and other 2 lines are for newly increasing the signals collecting of resistance terminal; Wherein two can lead to super-high-current for being connected in major loop, and other 4 are divided into two groups, and each organizes two lines, for drawing the signal on the shunt of corresponding section.
Current detecting adopts the first current detection circuit and the second current detection circuit, and the function of two current detection circuit unit realizations is the same, is respectively used to detect the signal of two different sections of shunt, measures the electric current that flows through shunt.
Image data interval time T with for the preset difference value contrasting, be the storage unit that pre-sets and be stored in battery management system.Wherein, interval time, T was according to the set set of frequency of hardware circuit, and when the set frequency of hardware circuit is 16MHz, interval time, T was less than 1/16MHz.
Detection system is measured two current signals in real time, and utilizes the result of measuring to carry out mutual verification, and the accuracy of ONLINE RECOGNITION current detecting, improves the reliability detecting.
In battery management system; the current signal that MCU circuit unit gathers the first current detection circuit and the second current detection circuit gathers and processes; and gathered current value is carried out to real-time verification; when the difference of detected current value surpasses after certain limit; think and occur current detecting fault; and should be used as conservation treatment to relevant to current detecting, prevent errored response.Occur, after current detecting fault, reporting system-level controller, notify it to take measures, vehicle or system are done to emergency treatment.
The specific implementation process flow diagram of the method as shown in Figure 2.
S1: battery management system is monitored the electric current of monitored system;
S2: shunt is carried out to signals collecting one time every time T, obtain two groups of data;
S3: utilize Ohm law to process the signal data collecting, obtain two groups of real-time current values;
S4: two groups of current data after processing are contrasted to verification, when the difference of two groups of current data surpasses preset difference value, carry out next step operation, if do not surpass preset difference value, choose smaller value as current current value and return to step S1;
S5: be judged as current detecting and break down, battery management system is by fault information reporting system-level controller and return to step S1.
The above is better embodiment of the present invention, not the present invention is done to any pro forma restriction.It should be noted that; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these changes and distortion all should belong to the protection domain of the appended claim of the present invention.

Claims (4)

1. a current redundant method of calibration for electrokinetic cell, is characterized in that: described method is
S1: battery management system is monitored the electric current of electric battery;
S2: shunt is carried out to signals collecting one time every time T, obtain two groups of data;
S3: the signal data collecting is processed, obtained two groups of real-time current values;
S4: two groups of current data after processing are contrasted to verification, when the difference of two groups of current data surpasses preset difference value, carry out next step operation, if do not surpass preset difference value, choose smaller value as current current value and return to step S1;
S5: be judged as current detecting and break down, battery management system is by fault information reporting system-level controller and return to step S1.
2. the current redundant method of calibration of electrokinetic cell according to claim 1, is characterized in that, described shunt is six line systems.
3. the current redundant method of calibration of electrokinetic cell according to claim 2, is characterized in that, the treatment step to signal data in described step S3 obtains according to ohm law.
4. the current redundant method of calibration of electrokinetic cell according to claim 3, is characterized in that, described image data interval time T with for the preset difference value contrasting, be the storage unit that pre-sets and be stored in battery management system.
CN201310674286.7A 2013-12-13 2013-12-13 Method for redundancy check of currents of power battery Pending CN103675705A (en)

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Application Number Priority Date Filing Date Title
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104569832A (en) * 2014-12-09 2015-04-29 惠州市亿能电子有限公司 Correcting method of residual capacity of BMS battery
CN105301336A (en) * 2015-09-30 2016-02-03 安徽江淮汽车股份有限公司 Two-channel current sensor-based signal acquisition and fault diagnosis method
CN105738819A (en) * 2016-02-03 2016-07-06 成都雅骏新能源汽车科技股份有限公司 Battery management system total current estimation method
CN108152558A (en) * 2017-11-23 2018-06-12 北京新能源汽车股份有限公司 A kind of current sampling system and electric vehicle
CN109143839A (en) * 2018-09-04 2019-01-04 广西质量技术工程学校 A kind of sensor redundancy control method highly fault tolerant
CN110161415A (en) * 2019-05-29 2019-08-23 浙江吉利控股集团有限公司 A kind of battery current acquisition system and diagnostic method
CN110749771A (en) * 2019-10-15 2020-02-04 宁波吉利汽车研究开发有限公司 Current acquisition system, current acquisition device and electric automobile
CN112540211A (en) * 2020-12-04 2021-03-23 上海辛格林纳新时达电机有限公司 Current checking method and system, upper computer and storage medium

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CN201138371Y (en) * 2007-12-25 2008-10-22 青岛四方车辆研究所有限公司 5 KW electricity generator experimental bench
US20100182154A1 (en) * 2007-09-28 2010-07-22 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Battery management system for electric vehicle
CN102263303A (en) * 2011-06-02 2011-11-30 福州天和新能电子科技有限公司 Modular lithium power battery, and management system and management method thereof
CN203117411U (en) * 2012-12-18 2013-08-07 惠州市亿能电子有限公司 BMS current error test system
CN103364611A (en) * 2012-04-03 2013-10-23 罗伯特·博世有限公司 A device and a method for the redundant determination of a battery current flowing through the poles of a battery

Patent Citations (6)

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JP2002506514A (en) * 1996-04-10 2002-02-26 バクスター・インターナショナル・インコーポレイテッド Battery gauge
US20100182154A1 (en) * 2007-09-28 2010-07-22 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Battery management system for electric vehicle
CN201138371Y (en) * 2007-12-25 2008-10-22 青岛四方车辆研究所有限公司 5 KW electricity generator experimental bench
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104569832A (en) * 2014-12-09 2015-04-29 惠州市亿能电子有限公司 Correcting method of residual capacity of BMS battery
CN104569832B (en) * 2014-12-09 2018-07-20 惠州市亿能电子有限公司 A kind of modification method of BMS battery remaining powers
CN105301336A (en) * 2015-09-30 2016-02-03 安徽江淮汽车股份有限公司 Two-channel current sensor-based signal acquisition and fault diagnosis method
CN105301336B (en) * 2015-09-30 2018-07-10 安徽江淮汽车集团股份有限公司 A kind of signal acquisition and fault judgment method based on binary channels current sensor
CN105738819A (en) * 2016-02-03 2016-07-06 成都雅骏新能源汽车科技股份有限公司 Battery management system total current estimation method
CN108152558A (en) * 2017-11-23 2018-06-12 北京新能源汽车股份有限公司 A kind of current sampling system and electric vehicle
CN109143839A (en) * 2018-09-04 2019-01-04 广西质量技术工程学校 A kind of sensor redundancy control method highly fault tolerant
CN110161415A (en) * 2019-05-29 2019-08-23 浙江吉利控股集团有限公司 A kind of battery current acquisition system and diagnostic method
CN110749771A (en) * 2019-10-15 2020-02-04 宁波吉利汽车研究开发有限公司 Current acquisition system, current acquisition device and electric automobile
CN112540211A (en) * 2020-12-04 2021-03-23 上海辛格林纳新时达电机有限公司 Current checking method and system, upper computer and storage medium

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