CN104410111A - Voltage acquisition wire impedance compensation algorithm for cell management system - Google Patents
Voltage acquisition wire impedance compensation algorithm for cell management system Download PDFInfo
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- CN104410111A CN104410111A CN201410604882.2A CN201410604882A CN104410111A CN 104410111 A CN104410111 A CN 104410111A CN 201410604882 A CN201410604882 A CN 201410604882A CN 104410111 A CN104410111 A CN 104410111A
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Abstract
The invention provides a voltage acquisition wire impedance compensation algorithm for a cell management system. The voltage acquisition wire impedance compensation algorithm comprises steps that: 1, voltage magnitude of each cell in a cell pack is periodically detected, whether the voltage magnitude of one cell is abnormal is determined, if the voltage magnitude of one cell is abnormal, entering to the second step, or exiting the flow; 2, an impedance compensation circuit starts, a constant current is exerted on a voltage acquisition loop from which the abnormal voltage magnitude is acquired; 3, a voltage magnitude of the voltage acquisition loop corresponding to the abnormal voltage value is re-acquired, whether the re-acquired voltage magnitude is abnormal is determined, if abnormal, entering to the fourth step, or exiting the flow; and 4, power supply of the cell pack is cut off forcibly, or power supply power of the cell pack is reduced. Through the voltage acquisition wire impedance compensation algorithm, abnormity of the acquired voltage of one cell can be timely discovered, abnormity can be eliminated without manual dust cleaning, and adaptability to a serious environment, stability and reliability of cell products are further improved.
Description
Technical field
The present invention relates to battery management system field, be specifically related to the impedance-compensated algorithm of voltage gathering line on a kind of battery management system.
Background technology
Current most BMS(battery management system) mode of voltage acquisition is from plate by the BMU(of BMS) voltage acquisition chip with voltage acquisition line for medium gathers monomer battery voltage, and the cell voltage value collected is reported the BCU(mainboard of BMS), directly power brick is controlled by BCU, simultaneously mutual with car load.
But, the environment for use of power brick on the public transport big bus or mine car in suburb is severe, easy accumulation dust on the harness connector plug of the BMS voltage acquisition line of power brick inside, contact resistance is caused to increase, thus cause BMS, when voltage acquisition, voltage acquisition line has pressure drop further, the monomer battery voltage that result also in BMS collection is more on the low side than the actual monomer battery voltage of battery, BMS collects false monomer battery voltage on the low side, the action protecting battery in advance can be made, as battery management system in driving conditions forces power-off to protect battery, car load is caused to lie prone car or force low speed etc., affect the use of power brick the most at last, and in this case, need to tear power brick open, the state of individual inspiration battery, carry out the reason that failure judgement occurs, need the dust clearing up power brick inside to fix a breakdown simultaneously, to allow power brick resumption of service.
Fig. 1 gives the technical Analysis schematic diagram that accumulation dust on voltage acquisition line causes power brick fault, as shown in Figure 1, resistance (being the resistance voltage acquisition line) R1-R5 represents from battery electrode column to BMS acquisition circuit, C1-C4 represents cell, if accumulation has dust on the voltage acquisition line represented by R1 or R5, then the resistance value of R1 or R5 increases, suppose that the resistance value of R2 and R4 is normal, due to the dividing potential drop of R1 and R5, so BMS collect the voltage of C1 or C4 can be lower than actual cell voltage value, also namely cause collection single-unit magnitude of voltage on the low side, if accumulation has dust on the voltage acquisition line represented by R2, then the resistance value of R2 increases, and supposes that the resistance value of R1 and R3 is normal, due to the dividing potential drop of R2, so BMS collect the voltage of C1 or C2 can be lower than actual cell voltage, also namely cause and gather adjacent two joint single-unit low voltages.
Summary of the invention
Technical problem to be solved by this invention is to provide the impedance-compensated algorithm of voltage gathering line on a kind of battery management system, by carrying out voltage compensation on voltage acquisition line, above-mentioned fault can be avoided to occur, do not affect the normal use of power brick.
Technical scheme of the present invention comprises the steps:
The magnitude of voltage of each cell in step one, periodically detection battery pack, judges whether that the magnitude of voltage that there is certain cell is abnormal, if the magnitude of voltage that there is certain cell is abnormal, then enters step 2, otherwise exit this flow process;
Step 2, on-resistance compensating circuit, apply continuous current to the voltage acquisition circuit collecting described abnormal voltage value;
Step 3, the voltage acquisition circuit that described abnormal voltage value is corresponding gather magnitude of voltage again, judge that whether this magnitude of voltage again collected is still abnormal, if still abnormal, then enter step 4, otherwise exit this flow process;
Step 4: the power supply of force disconnect battery pack or the output power of reduction battery pack.
Preferably, the described magnitude of voltage judging whether to exist certain cell is abnormal, if the magnitude of voltage that there is certain cell is abnormal, the concrete grammar then entering step 2 is: judge in the magnitude of voltage of described each cell, whether there is magnitude of voltage lower than threshold value Th1 or judge that in described battery pack, whether most difference between high monomer magnitude of voltage and minimum cell voltage value is higher than threshold value Th2, if the magnitude of voltage that there is certain cell lower than the difference between high monomer magnitude of voltage and minimum cell voltage value most in threshold value Th1 or described battery pack higher than threshold value Th2, then the described magnitude of voltage lower than threshold value Th1 or described minimum cell voltage value are abnormal voltage value, then enter step 2.
Preferably, describedly judge that whether this magnitude of voltage again collected is still abnormal, if still abnormal, the concrete grammar then entering step 4 is: judge that whether the difference of the magnitude of voltage whether this magnitude of voltage again collected collects again lower than threshold value Th1 or this and certain cell voltage value is higher than threshold value Th2, if the difference of the magnitude of voltage that the magnitude of voltage again collected described collects again lower than threshold value Th1 or this and certain cell voltage value higher than threshold value Th2, then enters step 4.
Preferably, the duration that the described voltage acquisition circuit to collecting described abnormal voltage value applies continuous current is 5-15 second.
Preferably, described threshold value Th1 is 2.0v-2.5v, and described threshold value Th2 is 100mv-400mv.
Tool of the present invention has the following advantages and beneficial effect:
1, by Optimization Software control strategy, after adopting on-resistance compensating circuit to apply electric current to acquisition circuit, contact resistance increases with electric current and reduces, impel collection voltage resume normal, avoid BMS false judgment, strengthen the collection fault tolerance of BMS, car load is run more stable.
2, staggering time performs impedance-compensated with monomer voltage collection, can not make on-resistance and compensate the voltage acquisition error caused.
3, by the impedance-compensated algorithm of voltage gathering line on battery management system, when not to power brick unpack fault that cleaning dust gets rid of, ensure the normal use of power brick, strengthen product to the adaptability of adverse circumstances, stability and reliability simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, accompanying drawing required in describing embodiment is done simple introduction below, apparently, accompanying drawing described below is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is power brick fault principle analysis figure in prior art.
Fig. 2 is the circuit theory diagrams of the impedance-compensated algorithm of the present invention.
Embodiment
Elaborate below in conjunction with the embodiment of Figure of description to the embodiment of the present invention.
The present invention uses the contact resistance of dust increase with electric current and reduce this characteristic, reduce the contact resistance of dust by the mode be energized to the dust that voltage acquisition line is accumulated and carry out impedance-compensated, thus making the voltage of the cell collected be normal value.Specific embodiment of the invention scheme is:
As shown in Figure 2, each cell Cell1 of battery pack, Cell2 ... Celln respectively by switch T1, T2 ... Tn is connected to DC current source DC, the span of the output current value of DC current source is 30-300mA, and each switch is all connected with controller.Controller regularly detects the magnitude of voltage U1 of each cell collected every some cycles t0, U2, Un, wherein t0 value is 50-900mS, suppose that the battery pack selected in the present embodiment is lithium battery group, then consider according to the characteristic of lithium battery, set this lithium battery can by normally use low pressure threshold Th1 as 2.5v, those skilled in the art also can set different low pressure threshold according to the type difference of used battery pack, the span of described low pressure threshold is generally 2.0v-2.5v, controller judges each monomer battery voltage according to set threshold value, whether detection exists the magnitude of voltage of a certain cell lower than 2.5v.Suppose to detect that the magnitude of voltage U2 collected from Cell2 is lower than 2.5v, then illustrate that the voltage collected from Cell2 exists abnormal, now need to carry out impedance-compensated to the voltage acquisition circuit of Cell2, controller sends command signal and impels switch T1 and T2 to close, to apply electric current by DC current source DC to the voltage acquisition circuit of cell Cell2.Similarly, if magnitude of voltage Ui is abnormal, wherein 1≤i≤n, then controller control switch T (i-1) and Ti closes or disconnects.In order to avoid voltage acquisition error, usually unsuitable long to the duration of voltage acquisition circuit applying electric current, be generally 5-15s, setting the time of DC current source to voltage acquisition circuit applying electric current in the present embodiment is 10s, after 10s, switch T1 and T2 disconnects automatically, impedance-compensated process terminates, the resistance of voltage acquisition circuit recovers normal, keep stable in short time voltage, the magnitude of voltage now collected is accurate data, voltage acquisition error can not be caused, therefore the cell voltage value that controller gathers Cell2 again detects, judge that whether impedance-compensated rear collected U2 value is still lower than threshold value 2.5v, if still lower than 2.5v, then judge that the virtual voltage of battery Cell2 is on the low side, need by forcing power-off or restriction power output to protect battery, if be not less than 2.5v, then judge that the virtual voltage of battery Cell2 is normal.
Except aforesaid way, by another way, the present invention also judges that whether the cell voltage value gathered is abnormal, which for: controller compares collected each monomer battery voltage, if most difference between high monomer magnitude of voltage and minimum cell voltage value is more than or equal to another threshold value Th2, then illustrate that this minimum cell voltage value exists abnormal, threshold value Th2 is set as 200mv by the characteristic according to lithium battery in the present embodiment, the general span of threshold value Th2 is 100mv-400mv, the switch that controller controls on the acquisition circuit of this cell corresponding to minimum cell voltage value closes, to carry out impedance-compensated to the resistance on this acquisition circuit.
It should be noted that monomer voltage collection in the present invention and on-resistance compensate is that staggering time performs, and can not make on-resistance and compensate the voltage acquisition error caused.When on-resistance compensate function, have electric current in voltage acquisition circuit to flow through, after applying electric current, contact resistance increases with electric current and reduces, resistance value is now also unstable in change, the voltage that this resistance value is shared in voltage acquisition circuit also can be unstable, finally causes voltage acquisition to be forbidden, so do not carry out voltage acquisition and detection when impedance-compensated.In blink after impedance compensation function completes, now impedance compensation function terminates, and the resistance of acquisition circuit has recovered normal, and keep stable in short time voltage, the magnitude of voltage now collected is accurate data, can not cause voltage acquisition error.
The present invention is by occurring that to magnitude of voltage the mode of abnormal monomer voltage acquisition circuit applying electric current carries out the impedance-compensated of voltage acquisition line; and Resurvey impedance-compensated after magnitude of voltage; judge that reality carries out pressure power-off protection the need of to battery according to impedance-compensated rear collected magnitude of voltage; force power-off after avoiding BMS to collect the monomer battery voltage of falseness on the low side, and affect the normal use of power brick.The present invention reliably can find the exception of gathered monomer battery voltage in time, and without the need to manually clearing up dust to get rid of exception, enhances battery product to the adaptability of adverse circumstances, stability and reliability simultaneously.
The above embodiment only have expressed preferred embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (5)
1. the impedance-compensated algorithm of voltage gathering line on battery management system, is characterized in that, comprise the steps:
The magnitude of voltage of each cell in step one, periodically detection battery pack, judges whether that the magnitude of voltage that there is certain cell is abnormal, if the magnitude of voltage that there is certain cell is abnormal, then enters step 2, otherwise exit this flow process;
Step 2, on-resistance compensating circuit, apply continuous current to the voltage acquisition circuit collecting described abnormal voltage value;
Step 3, the voltage acquisition circuit that described abnormal voltage value is corresponding gather magnitude of voltage again, judge that whether this magnitude of voltage again collected is still abnormal, if still abnormal, then enter step 4, otherwise exit this flow process;
Step 4: the power supply of force disconnect battery pack or the output power of reduction battery pack.
2. the impedance-compensated algorithm of voltage gathering line on a kind of battery management system according to claim 1, it is characterized in that, the described magnitude of voltage judging whether to exist certain cell is abnormal, if the magnitude of voltage that there is certain cell is abnormal, the concrete grammar then entering step 2 is: judge in the magnitude of voltage of described each cell, whether there is magnitude of voltage lower than threshold value Th1 or judge that in described battery pack, whether most difference between high monomer magnitude of voltage and minimum cell voltage value is higher than threshold value Th2, if the magnitude of voltage that there is certain cell lower than the difference between high monomer magnitude of voltage and minimum cell voltage value most in threshold value Th1 or described battery pack higher than threshold value Th2, then the described magnitude of voltage lower than threshold value Th1 or described minimum cell voltage value are abnormal voltage value, enter step 2.
3. the impedance-compensated algorithm of voltage gathering line on a kind of battery management system according to claim 1, it is characterized in that, describedly judge that whether this magnitude of voltage again collected is still abnormal, if still abnormal, the concrete grammar then entering step 4 is: judge that whether the difference of the magnitude of voltage whether this magnitude of voltage again collected collects again lower than threshold value Th1 or this and certain cell voltage value is higher than threshold value Th2, if the difference of the magnitude of voltage that the magnitude of voltage again collected described collects again lower than threshold value Th1 or this and certain cell voltage value is higher than threshold value Th2, then enter step 4.
4. on a kind of battery management system according to Claims 2 or 3, the impedance-compensated algorithm of voltage gathering line, is characterized in that, the duration that the described voltage acquisition circuit to collecting described abnormal voltage value applies continuous current is 5-15 second.
5. on a kind of battery management system according to Claims 2 or 3, the impedance-compensated algorithm of voltage gathering line, is characterized in that, described threshold value Th1 is 2.0v-2.5v, and described threshold value Th2 is 100mv-400mv.
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Cited By (5)
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| CN107478946A (en) * | 2016-08-29 | 2017-12-15 | 宝沃汽车（中国）有限公司 | Diagnostic method, system and the vehicle of the monomer voltage collection wire harness of electrokinetic cell |
| CN108896929A (en) * | 2018-07-26 | 2018-11-27 | 安徽锐能科技有限公司 | Method for measuring the monomer voltage of battery pack |
| CN109116239A (en) * | 2018-06-06 | 2019-01-01 | 安徽锐能科技有限公司 | The detection system of monomer voltage for battery pack |
| CN113640686A (en) * | 2021-07-12 | 2021-11-12 | 杭州高特电子设备股份有限公司 | Fault self-diagnosis device and method |
| CN116540113A (en) * | 2023-06-26 | 2023-08-04 | 深圳市好盈科技股份有限公司 | Prediction method and device for battery voltage of model airplane electronic speed regulator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107478946A (en) * | 2016-08-29 | 2017-12-15 | 宝沃汽车（中国）有限公司 | Diagnostic method, system and the vehicle of the monomer voltage collection wire harness of electrokinetic cell |
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| CN113640686A (en) * | 2021-07-12 | 2021-11-12 | 杭州高特电子设备股份有限公司 | Fault self-diagnosis device and method |
| CN113640686B (en) * | 2021-07-12 | 2024-03-12 | 杭州高特电子设备股份有限公司 | Fault self-diagnosis device and method |
| CN116540113A (en) * | 2023-06-26 | 2023-08-04 | 深圳市好盈科技股份有限公司 | Prediction method and device for battery voltage of model airplane electronic speed regulator |
| CN116540113B (en) * | 2023-06-26 | 2023-10-24 | 深圳市好盈科技股份有限公司 | Prediction method and device for battery voltage of model airplane electronic speed regulator |
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