CN108375737A - A kind of diagnostic method of battery pack monomer voltage acquisition failure - Google Patents
A kind of diagnostic method of battery pack monomer voltage acquisition failure Download PDFInfo
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- CN108375737A CN108375737A CN201711469432.7A CN201711469432A CN108375737A CN 108375737 A CN108375737 A CN 108375737A CN 201711469432 A CN201711469432 A CN 201711469432A CN 108375737 A CN108375737 A CN 108375737A
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- battery core
- battery
- battery pack
- pressure difference
- limit value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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Abstract
The present invention discloses a kind of diagnostic method of battery pack monomer voltage acquisition failure, including：1) it monitors and records all single battery core gathering line both end voltage differences, and calculate instantaneous differential pressure change rate；2) judge whether voltage difference is more than limit value, the pressure difference change rate before and after the super over time check moment；3) judge whether pressure difference change rate is more than limit value, whether two big battery cores of generation pressure difference are adjacent as checked more than if；4) as adjacent, and its average voltage then belongs to the gathering line problem between two battery core close to all battery core average voltages, and error value is replaced using two battery core average voltages；5) as non-conterminous, then whether abnormal, such as abnormal if checking respectively for battery core voltage adjacent thereto, then using its battery core adjacent thereto as one group, return to step 2).The present invention can more accurately determine that the big problem of battery pack monomer voltage difference, the electric voltage equalization for avoiding false triggering due to this kind of pressure difference big problem are damaged caused by battery pack caused by gathering line.
Description
Technical field
It is especially a kind of by going here and there monomer composition the present invention relates to the diagnostic method that battery pack monomer voltage acquires failure more
The diagnostic method of the monomer acquisition harness failure of battery pack.
Background technology
At present for battery pack system, monomer acquisition harness failure is generally reported and submitted as monomer pressure difference failure in industry, and
Concrete reason not big to pressure difference judges.
Invention content
For problems of the prior art, the object of the present invention is to provide a kind of battery pack monomer voltages to acquire failure
Diagnostic method, include the following steps：
1) controller monitoring and record all battery pack monomers battery core gathering line both end voltage difference, and calculate accordingly
Instantaneous differential pressure change rate；
2) judge whether the difference of battery core gathering line both end voltage is more than limit value A, when more than when, before and after checking the moment
Instantaneous differential pressure change rate；Such as it is no more than, then return to step 1)；
3) judge whether the instantaneous differential pressure change rate before and after the moment is more than limit value B, if pressure difference change rate is more than limit value B
Then check whether two big battery cores of generation pressure difference are adjacent；If being no more than limit value B, diagnosed by other diagnosis methods；
4) adjacent in case of two big battery cores of pressure difference, and its average voltage is close to all battery core average voltages,
Then it is judged as belonging to the gathering line problem between two battery core, and error value is replaced using two battery core average voltages；If it happens
Two big battery cores of pressure difference are adjacent, and its average voltage keeps off all battery core average voltages, then select other diagnosis ways
Diameter diagnoses；
If 5) the big battery core of two pressure differences is non-conterminous, whether extremely battery core voltage adjacent thereto is checked respectively for, if different
Often, then using its battery core adjacent thereto as one group, return to step 2).
It is further preferred that the limit value A in the step 2) is determined according to the type of battery core.
It is further preferred that the limit value A in the step 2) is 200mV.
It is further preferred that the limit value B in the step 3) is loosened according to analog acquisition line and is obtained by experiment.
It is further preferred that the limit value B in the step 3) is 50mV/s.
It is further preferred that other diagnosis methods in the step 4) include the diagnosis of battery core pressure difference major break down and monomer electricity
Press unreasonable fault diagnosis.
It is further preferred that the step 2) in check the moment before and after instantaneous differential pressure change rate digital examination moment before
The instantaneous differential pressure change rate of 1s afterwards.
The diagnostic method of battery pack monomer voltage acquisition failure provided by the invention, has the advantages that：
Compared with prior art, the present invention being more accurately determined that battery pack monomer voltage difference is big caused by gathering line
Problem, and software compensation (two battery core average voltages being used to replace error value) has been carried out, it avoids because this kind of pressure difference is asked greatly
Topic and the electric voltage equalization of false triggering is damaged caused by battery pack.
Description of the drawings
Fig. 1 is the logic chart for the diagnostic method that battery pack monomer voltage provided by the invention acquires failure.
Fig. 2 is the Acquisition Circuit schematic diagram of gathering line both ends potential.
Fig. 3 is voltage change contrast schematic diagram when breaking down.
Specific implementation mode
By multi-string battery monomer composition battery pack for some reason (such as connector loosen, solder joint aging corrosion
Deng), often cause the potential that certain root gathering line acquires to be abnormal, and then the battery core pressure difference at gathering line both ends can be caused to increase
Greatly, it when the problem occurs, the battery core voltage at fault collection line both ends and will not change.According to the principle, the present invention provides one
The diagnostic method of kind battery pack monomer voltage acquisition failure, logic chart is as shown in Figure 1, specifically include following steps：
1) controller monitoring and the battery core pressure difference at all battery pack monomer gathering line both ends is recorded, and calculates instantaneous pressure accordingly
Poor change rate；
2) judge whether battery core pressure difference is more than that (type according to battery core determines limit value A, such as 200mV, and with battery
Store the reduction of the ability SOH of charge and increase), when more than when, check the instantaneous differential pressure change rate of (1s) before and after the moment (i.e.
The change rate of step 1)；Such as it is no more than (including being equal to), then return to step 1) continue to monitor；
3) judge whether the instantaneous differential pressure change rate at front and back moment is more than limit value B (such as 50mV/s), if pressure difference changes
Rate is more than that limit value B (i.e. pressure difference mutates) then checks whether two big battery cores of generation pressure difference are adjacent；If being no more than limit value B,
It can then be diagnosed by other diagnosis methods (such as unreasonable failure of battery core pressure difference major break down, monomer voltage)；
4) adjacent in case of two big battery cores of pressure difference, and its average voltage is all close to (such as within ± 2%)
Battery core average voltage, then it is assumed that belong to the gathering line problem between two battery core, then use two battery core average voltages to replace wrong
Accidentally value (being software compensation herein)；It is adjacent in case of two big battery cores of pressure difference, and its average voltage keeps off all electricity
Core average voltage then selects other diagnosis methods to diagnose；
If 5) the big battery core of two pressure differences is non-conterminous, check respectively for battery core adjacent thereto (i.e. with ceiling voltage battery core and
The adjacent battery core of minimum voltage battery core) whether voltage is abnormal, if exception, using its battery core adjacent thereto as one group, repeat
Return to step 2).
The present invention used Acquisition Circuit in collection voltages is as shown in Figure 2.
This method is not suitable for the diagnosis of both ends gathering line, and (" both ends gathering line " refers to the acquisition that battery pack is in both ends
Line, as shown in Fig. 2, 0 and 5 two gathering line.This method can not confirm whether the two gathering lines loosen, therefore the acquisition at this
Line has used two, and two verify mutually), therefore the potential of two-way verification both ends gathering line is used first；
Acquire the potential between five battery cores of a to e：It arrivesEach potential is made into the voltage U that difference obtains five battery coresaTo Ue；
It is sufficiently close in the voltage value of normal condition, battery core both ends, as shown in Figure 3；
When certain root gathering line loosening etc., causes the potential of some collection point to be mutated, the battery core of the gathering line both sides can be caused
Voltage difference becomes larger, such as Fig. 3 malfunctions；
Whether by preceding diagnosis method, it is because gathering line problem causes, and to caused by the reason to judge pressure difference greatly
Abnormal battery core voltage is replaced using average value.
Specific case used herein elaborates inventive concept, the explanation of above example is only intended to
Help understands core of the invention thought.It should be pointed out that for those skilled in the art, not departing from this
Under the premise of inventive concept, any obvious modification, equivalent replacement or the other improvements made should be included in the present invention
Protection domain within.
Claims (7)
1. a kind of diagnostic method of battery pack monomer voltage acquisition failure, which is characterized in that including following steps：
1) controller monitoring and record all battery pack monomers battery core gathering line both end voltage difference, and calculate accordingly instantaneous
Pressure difference change rate；
2) judge whether the difference of battery core gathering line both end voltage is more than limit value A, when more than when, check instantaneous before and after the moment
Pressure difference change rate；Such as it is no more than, then return to step 1)；
3) judge whether the instantaneous differential pressure change rate before and after the moment is more than limit value B, is examined if pressure difference change rate is more than limit value B
Whether adjacent look into two big battery cores of generation pressure difference；If being no more than limit value B, diagnosed by other diagnosis methods；
4) adjacent in case of two big battery cores of pressure difference, and its average voltage is then sentenced close to all battery core average voltages
Break as the gathering line problem for belonging between two battery core, and error value is replaced using two battery core average voltages；In case of pressure difference
Two big battery cores are adjacent, and its average voltage keeps off all battery core average voltages, then other diagnosis methods is selected to examine
It is disconnected；
If 5) the big battery core of two pressure differences is non-conterminous, whether extremely battery core voltage adjacent thereto is checked respectively for, if abnormal,
Using its battery core adjacent thereto as one group, return to step 2).
2. the diagnostic method of battery pack monomer voltage acquisition failure according to claim 1, which is characterized in that the step
2) the limit value A in is determined according to the type of battery core.
3. the diagnostic method of battery pack monomer voltage acquisition failure according to claim 1, which is characterized in that the step
2) the limit value A in is 200mV.
4. the diagnostic method of battery pack monomer voltage acquisition failure according to claim 1, which is characterized in that the step
3) the limit value B in is loosened according to analog acquisition line and is obtained by experiment.
5. the diagnostic method of battery pack monomer voltage acquisition failure according to claim 1, which is characterized in that the step
3) the limit value B in is 50mV/s.
6. the diagnostic method of battery pack monomer voltage acquisition failure according to claim 1, which is characterized in that the step
4) other diagnosis methods in include the diagnosis of battery core pressure difference major break down and the unreasonable fault diagnosis of monomer voltage.
7. the diagnostic method of battery pack monomer voltage acquisition failure according to claim 1, which is characterized in that the step
2) the instantaneous differential pressure change rate of 1s before and after instantaneous differential pressure change rate digital examination moment in before and after the inspection moment.
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| CN201711469432.7A CN108375737A (en) | 2017-12-29 | 2017-12-29 | A kind of diagnostic method of battery pack monomer voltage acquisition failure |
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| CN201711469432.7A CN108375737A (en) | 2017-12-29 | 2017-12-29 | A kind of diagnostic method of battery pack monomer voltage acquisition failure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111157911A (en) * | 2019-12-30 | 2020-05-15 | 北京四维智联科技有限公司 | Method, device and equipment for predicting excessive voltage difference of battery pack |
| CN113049975A (en) * | 2019-12-26 | 2021-06-29 | 观致汽车有限公司 | Power battery system fault diagnosis method, readable storage medium and vehicle |
| CN113687265A (en) * | 2021-08-26 | 2021-11-23 | 广州小鹏智慧充电科技有限公司 | Method and device for detecting disconnection of battery management system, vehicle, and medium |
| CN113945753A (en) * | 2021-09-01 | 2022-01-18 | 力高(山东)新能源技术有限公司 | Method for judging battery cell voltage abnormity of battery pack |
| CN114039114A (en) * | 2021-11-04 | 2022-02-11 | 中汽数据有限公司 | Sampling failure diagnosis method, device and storage medium for battery management system |
| CN114184973A (en) * | 2021-11-18 | 2022-03-15 | 安徽锐能科技有限公司 | Method and system for diagnosing potential defects in lithium battery pack charging process |
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| CN114184973A (en) * | 2021-11-18 | 2022-03-15 | 安徽锐能科技有限公司 | Method and system for diagnosing potential defects in lithium battery pack charging process |
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Application publication date: 20180807 |