CN103311991A - Battery management system and balanced state online monitoring method thereof - Google Patents
Battery management system and balanced state online monitoring method thereof Download PDFInfo
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- CN103311991A CN103311991A CN2013102486096A CN201310248609A CN103311991A CN 103311991 A CN103311991 A CN 103311991A CN 2013102486096 A CN2013102486096 A CN 2013102486096A CN 201310248609 A CN201310248609 A CN 201310248609A CN 103311991 A CN103311991 A CN 103311991A
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Abstract
The invention discloses a battery management system and a balanced state online monitoring method thereof. The battery management system comprises a micro-control unit, a battery voltage detection circuit controlled by the micro-control unit, a battery voltage balancing circuit controlled by the micro-control unit and a battery. The battery management system has the remarkable advantages of being capable being supported to be a large current balancing system; reducing the effect of balancing current on the voltage detection accuracy; being capable of completely separating voltage detection and battery balancing by aid of the framework design mode that single harness and dual channels are adopted for balancing harnesses and voltage detection harnesses which do not affect each other functionally, and meanwhile, not affecting complexity of system harness distribution due to the fact that the single harness and dual channel design is adopted for the harnesses and the quantity of the harnesses is as same as that of the original harnesses performing balancing by aid of the voltage detection harnesses; and being capable of monitoring balancing circuit impedance in real time and accordingly finding whether the balancing harnesses are opened or damaged timely.
Description
Technical field
The present invention relates to the battery management system field.
Background technology
Electrokinetic cell system or energy-storage battery system be the supporting installation battery management system of meeting generally, wherein in order to satisfy the consistency demands of applications of battery system, all can require to add equalizing system.But because the adding of equalizing system has brought the real-time of battery cell voltage monitoring and the contradiction of validity.Specifically, semiconductor manufacturer, mostly monomer voltage is detected and the integrated design of balancing control circuit, can not accurately measure monomer battery voltage for solving balancing procedure, generally can be when measuring the cell voltage of corresponding joint number, suspend balancing control circuit work midway temporarily, wait to finish and control requirement according to equilibrium again after monomer voltage is gathered, open corresponding equalizing circuit.Namely adopt the timesharing utilization, realize the function of balanced and voltage detecting.Cell voltage when existing this technical scheme only can be monitored equalizing circuit and do not work, and can not monitor the cell voltage of equalizing circuit when balanced, at balancing procedure, there was the potential safety hazard of putting or overcharging.For some novel, expensive battery pack, this problem is especially serious.
For this problem, propose a solution in the industry: system's designer has been developed special-purpose equalizing circuit system, with the use that walks abreast of existing voltage detecting circuit, closes the problem of equalizing circuit to solve the voltage measurement process need.But this method has caused new problem, if euqalizing current is bigger, when then equalizing circuit is started working, because the voltage acquisition wire harness exists resistance, binding post to exist and connects impedance, cause the voltage of voltage detecting circuit can not truly reflect cell voltage, the potential safety hazard that has battery overcharge or overdischarge equally, balanced simultaneously effect is unsatisfactory.
Summary of the invention
The present invention is directed to the problem of above-mentioned existence, propose
A kind of battery management system and equilibrium state on-line monitoring method thereof
The design that the present invention takes is:
A kind of battery management system, comprise micro-control unit, be subjected to micro-control unit controls battery voltage detection circuit, be subjected to the cell voltage equalizing circuit of micro-control unit controls, cell; The positive pole of the positive pole of battery voltage detection circuit and cell voltage equalizing circuit is connected to the cell positive pole by the passage in the first single line bundle binary channels respectively, the negative pole of the negative pole of battery voltage detection circuit and cell voltage equalizing circuit is connected to the cell negative pole by the passage in the second single line bundle binary channels respectively, described single line bundle binary channels the inside is that the lead of two mutually insulateds is entwined mutually, and the outside is the insulated cable sleeve pipe.
A kind of equilibrium state on-line monitoring method of battery management system comprises the step of monitoring cell open circuit voltage and terminal voltage, and this step is: measure cell DC internal resistance Rdc; Detect cell both end voltage U in real time by battery voltage detection circuit; If euqalizing current is I2 during the work of cell voltage equalizing circuit, micro-control unit calculates cell open circuit voltage Uocv=U+ I2*Rdc in real time; Micro-control unit is according to cell open circuit voltage Uocv, and real-time judge battery overcharge or over-discharge state start protection.
Preferably, the step that also comprises the balanced wire harness fault of on-line monitoring; This step is: detect cell both end voltage U in real time by battery voltage detection circuit; When the cell voltage equalizing circuit was worked, cell voltage equalizing circuit output voltage was Ub, and cell voltage equalizing circuit euqalizing current is I, and micro-control unit calculates cell voltage equalizing circuit impedance loop R=(Ub-U)/I in real time; If impedance loop greater than preset value, then sends cell voltage equalizing circuit failure alarm signal.
Preferably, the step of described measurement cell DC internal resistance Rdc comprises: control cell voltage equalizing circuit is not worked, and the detection battery cell voltage by voltage detecting circuit is U1, this moment euqalizing current I1=0;
The control equalizing circuit is carried out equalization operation, and euqalizing current is I2, and the detection battery cell voltage of voltage detecting circuit is U2; Battery DC internal resistance Rdc=(U2-U1)/(I2-I1) then.
In sum, the present invention has following significant beneficial effect:
(1) equalizing circuit and voltage detecting circuit independent design, equalizing circuit and testing circuit can concurrent workings, avoided in the balancing procedure, can not monitoring voltage and caused breaking through the problem of putting, be independent of each other, equalizing circuit and testing circuit euqalizing current can be transferred according to customer requirement fully and establish, and can support into big current balance system;
(2) balanced wire harness and voltage detecting wire harness are complete independence, and the two is common-use tunnel not, have reduced the existence of euqalizing current to the influence of voltage detecting precision.No matter equalizing circuit is during for operating state or non operating state, and the voltage acquisition line of testing circuit is directed to battery the two poles of the earth, and therefore, the monomer battery voltage acquisition precision can better guarantee;
(3) balanced wire harness and voltage detecting wire harness adopt the twin-channel architecture design of single line bundle, just can be with voltage detecting and battery balanced independent fully, and the two function is independent of each other.Simultaneously, wire harness adopts the design of single line bundle binary channels, and wire harness quantity is the same with the wire harness quantity of utilizing the voltage detecting wire harness to carry out equilibrium before, can not influence the complexity of system line wiring in bundles;
(4) monitor balanced impedance loop in real time, can find in time whether balanced wire harness is opened a way or damaged;
(5) by calculating the internal resistance of battery Equivalent DC, and according to this DC internal resistance, the open circuit voltage of the battery cell when calculating equilibrium is calculating battery SOC, precision is higher, this with respect to the test side voltage of prior art and calculate the precision of SOC higher, reduced error.
Description of drawings
Accompanying drawing 1 is of the present invention
A kind of battery management system and equilibrium state on-line monitoring method thereof
Description of reference numerals: single line bundle binary channels-1, Jie Cha spare – 2.
Need to prove, in order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the application does simple the introduction to the accompanying drawing of implementing required use in the description, apparently, the accompanying drawing that the application describes only is embodiments of the invention, to those skilled in the art, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Embodiment
In order to allow those skilled in the art understand technical scheme of the present invention better, the present invention is further elaborated below in conjunction with accompanying drawing.
As shown in Figure 1,
A kind of battery management system reaches: comprise micro-control unit, be subjected to micro-control unit controls battery voltage detection circuit, be subjected to the cell voltage equalizing circuit of micro-control unit controls, cell; The positive pole of the positive pole of battery voltage detection circuit and cell voltage equalizing circuit is connected to the cell positive pole by the passage in the first single line bundle binary channels respectively, the negative pole of the negative pole of battery voltage detection circuit and cell voltage equalizing circuit is connected to the cell negative pole by the passage in the second single line bundle binary channels respectively, described single line bundle binary channels the inside is that the lead of two mutually insulateds is entwined mutually, and the outside is the insulated cable sleeve pipe.The electrode of battery voltage detection circuit is connected with single line bundle binary channels by connector 2 with the electrode of cell voltage equalizing circuit.
Cell voltage equalizing circuit and battery voltage detection circuit are independent fully, and euqalizing current fully can be according to customer requirement, can realize big current balance system; Cell voltage equalizing circuit wire harness and battery voltage detection circuit wire harness are complete independence, and the two does not share, and has reduced the existence of euqalizing current to the influence of voltage detecting precision.When no matter equalizing circuit was operating state or non operating state, the voltage acquisition line of battery voltage detection circuit was directed to battery the two poles of the earth, and therefore, the monomer battery voltage acquisition precision can better guarantee; Balanced wire harness and voltage detecting wire harness adopt the twin-channel architecture design of single line bundle, just can be with voltage detecting and battery balanced independent fully, and the two function can not influence.Simultaneously, wire harness adopts the design of single line bundle binary channels, and wire harness quantity is the same with the wire harness quantity of utilizing the voltage detecting wire harness to carry out equilibrium before, can not influence the complexity of system line wiring in bundles.
Single line bundle binary channels, the inside are that two leads with two mutually insulateds are entwined according to certain way, and spiral twines counterclockwise, also spiral twines clockwise, can also other modes.Two wire sleeves the insulated cable sleeve pipe, and insulated cable sleeve pipe, lead outside can be provided with the battery screen.The diameter of two leads can be unequal, to adapt to different euqalizing currents.
A kind of battery management system equilibrium state on-line monitoring method, may further comprise the steps,
1) battery voltage detection circuit is monitored cell both end voltage (U) always.
2) when the cell voltage equalizing circuit is worked, cell voltage equalizing circuit output voltage (Ub), cell voltage equalizing circuit euqalizing current (I), micro-control unit calculate cell voltage equalizing circuit impedance loop R=(Ub-U)/I in real time; If impedance loop greater than preset value, then sends cell voltage equalizing circuit failure alarm signal.
3) measure cell DC internal resistance (Rdc): when the cell voltage equalizing circuit was idle, the detection voltage of record euqalizing current I1, voltage detecting circuit was U1; When equalizing circuit was worked, the euqalizing current of this moment was I2, and the detection voltage of voltage detecting circuit is U2; Calculating battery DC internal resistance Rdc=(U2-U1)/(I2-I1).
Euqalizing current I1 when 4) the cell voltage equalizing circuit is not worked; euqalizing current I2 during the work of cell voltage equalizing circuit; micro-control unit calculates cell open circuit voltage Uocv=U+ I2*Rdc in real time; micro-control unit is according to cell open circuit voltage Uocv; real-time judge battery overcharge or over-discharge state start protection.
5) micro-control unit calculates cell SOC in real time.
In the equalizing circuit course of work, battery is in the charge or discharge state, only can detect the terminal voltage of battery by voltage detecting circuit, and can't detect its open circuit voltage, and then utilize the SOC-OCV curve of battery to carry out also existing problems of cell SOC estimation.The application just can calculate the open circuit voltage of battery in conjunction with the terminal voltage that obtains that detects and euqalizing current, thereby accurately calculate cell SOC by calculating the battery DC internal resistance.
When balanced operation, euqalizing current I can be by the equalizing circuit On-line Control; The output voltage of equalizing circuit is Ub, equally can be by the equalizing circuit on-line monitoring.
Need to prove; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (4)
1. battery management system is characterized in that: comprise micro-control unit, be subjected to micro-control unit controls battery voltage detection circuit, be subjected to the cell voltage equalizing circuit of micro-control unit controls, cell; The positive pole of the positive pole of battery voltage detection circuit and cell voltage equalizing circuit is connected to the cell positive pole by the passage in the first single line bundle binary channels respectively, the negative pole of the negative pole of battery voltage detection circuit and cell voltage equalizing circuit is connected to the cell negative pole by the passage in the second single line bundle binary channels respectively, described single line bundle binary channels is entwined mutually by the lead of two mutually insulateds, and the outside is the insulated cable sleeve pipe.
One kind based on power 1 described battery management system equilibrium state on-line monitoring method, it is characterized in that:
Comprise the step of monitoring cell open circuit voltage and terminal voltage, this step is:
Measure cell DC internal resistance Rdc;
Detect cell both end voltage U in real time by battery voltage detection circuit;
If euqalizing current is I2 during the work of cell voltage equalizing circuit, micro-control unit calculates cell open circuit voltage Uocv=U+ I2*Rdc in real time;
Micro-control unit is according to cell open circuit voltage Uocv, and real-time judge battery overcharge or over-discharge state start protection.
3. weigh the equilibrium state on-line monitoring method of 2 described battery management systems according to claim, it is characterized in that: the step that also comprises the balanced wire harness fault of on-line monitoring; This step is:
Detect cell both end voltage U in real time by battery voltage detection circuit;
When the cell voltage equalizing circuit was worked, cell voltage equalizing circuit output voltage was Ub, and cell voltage equalizing circuit euqalizing current is I, and micro-control unit calculates cell voltage equalizing circuit impedance loop R=(Ub-U)/I in real time;
If impedance loop greater than preset value, then sends cell voltage equalizing circuit failure alarm signal.
4. weigh the equilibrium state on-line monitoring method of 2 described battery management systems according to claim, it is characterized in that: the step of described measurement cell DC internal resistance Rdc comprises:
Control cell voltage equalizing circuit is not worked, and the detection battery cell voltage by voltage detecting circuit is U1, this moment euqalizing current I1=0;
The control equalizing circuit is carried out equalization operation, and euqalizing current is I2, and the detection battery cell voltage of voltage detecting circuit is U2;
Battery DC internal resistance Rdc=(U2-U1)/(I2-I1) then.
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Cited By (17)
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| CN103823118A (en) * | 2014-02-25 | 2014-05-28 | 中航锂电（洛阳）有限公司 | Device and method for measuring internal resistance of battery cells during equalization |
| CN104135041A (en) * | 2014-04-21 | 2014-11-05 | 东莞钜威新能源有限公司 | Diagnosis method and diagnosis equipment of battery cell |
| CN105842538A (en) * | 2015-01-16 | 2016-08-10 | 致茂电子(苏州)有限公司 | Internal resistance measuring device |
| CN106816907A (en) * | 2015-11-30 | 2017-06-09 | 比亚迪股份有限公司 | Electric automobile and battery management system and its fault detection method |
| CN106816905A (en) * | 2015-11-30 | 2017-06-09 | 比亚迪股份有限公司 | Electric automobile and battery management system and its fault detection method |
| CN106842047A (en) * | 2017-01-22 | 2017-06-13 | 华北电力科学研究院有限责任公司 | The determination method and device of battery pack string uniformity |
| WO2018129884A1 (en) * | 2017-01-13 | 2018-07-19 | 宁德时代新能源科技股份有限公司 | Battery equalisation and sampling method |
| CN109031154A (en) * | 2018-10-26 | 2018-12-18 | 深圳市新威尔电子有限公司 | High accuracy battery AC internal Resistance detection device |
| CN109428358A (en) * | 2017-08-31 | 2019-03-05 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN109435770A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110015170A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110015169A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110015186A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
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| CN110015171A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN111654088A (en) * | 2020-06-23 | 2020-09-11 | 北京迈世高科电子技术有限公司 | Time-sharing voltage acquisition method applied to battery balancing instrument |
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| CN104135041A (en) * | 2014-04-21 | 2014-11-05 | 东莞钜威新能源有限公司 | Diagnosis method and diagnosis equipment of battery cell |
| CN105842538A (en) * | 2015-01-16 | 2016-08-10 | 致茂电子(苏州)有限公司 | Internal resistance measuring device |
| CN106816907B (en) * | 2015-11-30 | 2019-09-13 | 比亚迪股份有限公司 | Electric car and battery management system and its fault detection method |
| CN106816907A (en) * | 2015-11-30 | 2017-06-09 | 比亚迪股份有限公司 | Electric automobile and battery management system and its fault detection method |
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| CN106816905B (en) * | 2015-11-30 | 2019-09-13 | 比亚迪股份有限公司 | Electric car and battery management system and its fault detection method |
| WO2018129884A1 (en) * | 2017-01-13 | 2018-07-19 | 宁德时代新能源科技股份有限公司 | Battery equalisation and sampling method |
| CN106842047A (en) * | 2017-01-22 | 2017-06-13 | 华北电力科学研究院有限责任公司 | The determination method and device of battery pack string uniformity |
| CN109435770A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110015170A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110015169A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110015186A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110015177A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110015171A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN109428358A (en) * | 2017-08-31 | 2019-03-05 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN109031154A (en) * | 2018-10-26 | 2018-12-18 | 深圳市新威尔电子有限公司 | High accuracy battery AC internal Resistance detection device |
| CN109031154B (en) * | 2018-10-26 | 2024-08-20 | 深圳市新威尔电子有限公司 | High-precision battery alternating-current internal resistance detection equipment |
| CN111654088A (en) * | 2020-06-23 | 2020-09-11 | 北京迈世高科电子技术有限公司 | Time-sharing voltage acquisition method applied to battery balancing instrument |
| CN116106762A (en) * | 2023-02-07 | 2023-05-12 | 湖北钛时代新能源有限公司 | Battery pack voltage acquisition harness classification structure and classification method |
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