CN108445343A - A kind of power battery internal short-circuit detection method and system - Google Patents
A kind of power battery internal short-circuit detection method and system Download PDFInfo
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- CN108445343A CN108445343A CN201810201571.XA CN201810201571A CN108445343A CN 108445343 A CN108445343 A CN 108445343A CN 201810201571 A CN201810201571 A CN 201810201571A CN 108445343 A CN108445343 A CN 108445343A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Abstract
The invention discloses a kind of power battery internal short-circuit detection methods and system, this method to include：Acquire the terminal voltage of each battery pack in power battery；All terminal voltages are connected, occlusion detection model is built；The detection coefficient for the corresponding battery pack of previous terminal voltage for calculating the related coefficient of each adjacent two terminal voltage, and the related coefficient being determined as in two neighboring terminal voltage；Judge whether all detection coefficients are above given threshold；Short trouble does not occur inside power battery if so, determining；If it is not, then the battery pack corresponding to the detection coefficient not higher than given threshold is determined as the battery pack of short trouble occurs.On the one hand the present invention can quickly and effectively detect the short trouble of battery, ensure the safety of power battery by building occlusion detection model；On the other hand can accurately and effectively be positioned to breaking down, solve current power internal short-circuit of battery detect it is inaccurate, unstable the problems such as.
Description
Technical field
The present invention relates to power battery technology field, more particularly to a kind of power battery internal short-circuit detection method and it is
System.
Background technology
Power battery has been widely used on electric vehicle, and the security reliability of power battery is directly related to
The safe handling of electric vehicle.Power battery is applied to be influenced by its characteristic, has spy to environment temperature, application method etc.
Different requirement will not only ensure that it operates in good temperature environment, while also to set rational use in application process
Method and detection method, rational application method ensures the maximum performance of power battery, and detection method ensures power
Battery can be found in time when something goes wrong, in case causing the power battery of bigger to damage even causes cell safety accident.
The problem of power battery internal short-circuit is a kind of relation safety during power battery use, causes short in power battery
The possibility on road has the following：First, power battery charges at low temperatures, is determined by power battery performance, such as in low temperature
Charging, battery are easy to form crystallization, and crystal growth of accumulating over a long period punctures battery diaphragm, this results in power battery internal short-circuit；The
Two, it is overcharged in power battery or in the case of overdischarge, causes the irreversible of ion, in long-term cumulative process, can also make
At power battery internal short-circuit.
Since power battery is typically all single package, to the method that the detection of its internal short-circuit can not implemented directly,
The general method for all taking periodic maintenance in use, is periodically detected power battery.It is used for example, setting is certain
Time fills power battery full electric discharge entirely, by equipment collection analysis battery data, to suspicious battery (under battery capacity
Drop etc.) carry out manual maintenance.
Invention content
The object of the present invention is to provide a kind of power battery internal short-circuit detection method and systems, innovatively by battery pack
The terminal voltage design data acquired is a closed-loop system, compensates for current power internal short-circuit of battery detection method not
Foot, simplifies the required hardware facility of traditional circuit fault detect, reduces equipment cost, expands application range, while this
The reliability and safety of simple the advantages of easily the realizing guarantee power battery of invention in use.
To achieve the above object, the present invention provides following schemes：
A kind of power battery internal short-circuit detection method, the power battery internal short-circuit detection method include：
Acquire the terminal voltage of each battery pack in power battery；The power battery includes the n battery packs；
Judge whether each terminal voltage is more than voltage threshold, obtains the first judging result；
If first judging result indicates that the terminal voltage is more than the voltage threshold, judge all more than the electricity
It presses whether the duration of the terminal voltage of threshold value is more than preset time, obtains the second judging result；
If first judging result, which indicates that all terminal voltages are respectively less than, is equal to the voltage threshold, by all institutes
Terminal voltage series connection is stated, occlusion detection model is built；The occlusion detection model includes n terminal voltages, and first battery
The terminal voltage of group is also connected with the terminal voltage of the last one battery pack；
If it is default that second judging result indicates that the duration of the terminal voltage more than the voltage threshold is more than
Time, it is determined that the power battery breaks down；
If second judging result indicates that the duration of all terminal voltages more than the voltage threshold is less than
Equal to the preset time, then all terminal voltages is connected, build occlusion detection model；
The related coefficient between each adjacent two terminal voltage is calculated, and the related coefficient is determined as described two neighboring
The detection coefficient of the corresponding battery pack of previous terminal voltage in terminal voltage；
Judge whether all detection coefficients are above given threshold, obtains third judging result；
If the third judging result indicates that all detection coefficients are above the given threshold, it is determined that described dynamic
Short trouble does not occur for power inside battery；
It, will be not higher than if the third judging result indicates that all detection coefficients are not above the given threshold
Battery pack corresponding to the detection coefficient of the given threshold is determined as that the battery pack of short trouble occurs, and preserves generation
The terminal voltage of the battery pack of short trouble.
Optionally, the related coefficient calculated between each adjacent two terminal voltage, and the related coefficient is determined as
The detection coefficient of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage, specifically includes：
Using related coefficient algorithm, the related coefficient between each adjacent two terminal voltage is calculated, and by the related coefficient
It is determined as the detection coefficient of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage.
Optionally, the given threshold is 0.75.
Optionally, ranging from 2.0V~3.65V of the voltage threshold.
Optionally, the preset time is 1 minute.
The present invention also provides a kind of power battery internal short-circuit detecting system, the power battery internal short-circuit detection system
System includes：
Terminal voltage acquisition module, the terminal voltage for acquiring each battery pack in power battery；The power battery includes n
A battery pack；
First judging result obtains module, for judging whether each terminal voltage is more than voltage threshold, obtains first
Judging result；
Second judging result obtains module, for indicating that the terminal voltage is more than the voltage when first judging result
When threshold value, judge whether the duration of all terminal voltages more than the voltage threshold is more than preset time, obtains the
Two judging results；
Occlusion detection model construction module, for indicating that all terminal voltages are respectively less than when first judging result
In the voltage threshold or second judging result indicate all terminal voltages more than the voltage threshold it is lasting when
Between when being less than or equal to the preset time, will all terminal voltages series connection, structure occlusion detection model；The occlusion detection mould
Type includes the n terminal voltages, and the terminal voltage of first battery pack is also connected with the terminal voltage of the last one battery pack；
Power battery breaks down determining module, for being indicated more than the voltage threshold when second judging result
When the duration of the terminal voltage is more than preset time, determine that the power battery breaks down；
Related coefficient computing module, for calculating the related coefficient between each adjacent two terminal voltage, and by the correlation
Coefficient is determined as the detection coefficient of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage；
Third judging result obtains module, for judging whether all detection coefficients are above given threshold, obtains
Third judging result；
Short trouble determining module does not occur inside power battery, for indicating all described when the third judging result
When detection coefficient is above the given threshold, determines and short trouble does not occur inside the power battery；
Short trouble battery pack determining module occurs, for indicating all detection coefficients when the third judging result
When not being above the given threshold, the battery pack corresponding to the detection coefficient not higher than the given threshold is determined as
The battery pack of short trouble occurs, and preserves the terminal voltage for the battery pack that short trouble occurs.
Optionally, the related coefficient computing module, specifically includes：
Related coefficient computing unit calculates the correlation between each adjacent two terminal voltage for using related coefficient algorithm
Coefficient, and the inspection for the corresponding battery pack of the previous terminal voltage related coefficient being determined as in the two neighboring terminal voltage
Survey coefficient.
According to specific embodiment provided by the invention, the invention discloses following technique effects：
The present invention provides a kind of power battery internal short-circuit detection method and system, which includes：Acquire power
The terminal voltage of each battery pack in battery；The power battery includes the n battery packs；Whether judge each terminal voltage
More than voltage threshold, the first judging result is obtained；If first judging result indicates that the terminal voltage is more than the voltage threshold
Value, then judge whether the duration of all terminal voltages more than the voltage threshold is more than preset time, obtains second
Judging result；If first judging result, which indicates that all terminal voltages are respectively less than, is equal to the voltage threshold, will own
The terminal voltage series connection, builds occlusion detection model；The occlusion detection model includes n terminal voltages, and first electricity
The terminal voltage of pond group is also connected with the terminal voltage of the last one battery pack；If second judging result indicates to be more than the electricity
The duration of the terminal voltage of threshold value is pressed to be more than preset time, it is determined that the power battery breaks down；If described
Two judging results indicate that the duration of all terminal voltages more than the voltage threshold is less than or equal to the preset time,
Then all terminal voltages are connected, build occlusion detection model；The related coefficient between each adjacent two terminal voltage is calculated, and
The related coefficient is determined as to the detection coefficient of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage；
Judge whether all detection coefficients are above given threshold, obtains third judging result；If the third judging result table
Show that all detection coefficients are above the given threshold, it is determined that short trouble does not occur inside the power battery；If
The third judging result indicates that all detection coefficients are not above the given threshold, then will be not higher than the setting threshold
Battery pack corresponding to the detection coefficient of value is determined as that the battery pack of short trouble occurs, and preserves and short trouble occurs
The terminal voltage of battery pack.On the one hand the present invention can quickly and effectively detect the short circuit of battery by building occlusion detection model
Failure ensures the safety of power battery；On the other hand it can accurately and effectively be positioned to breaking down, solve and work as
The detection of preceding power battery internal short-circuit it is inaccurate, unstable the problems such as.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the flow diagram of power battery internal short-circuit detection method of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of power battery internal short-circuit detecting system of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram for the device that the embodiment of the present invention acquires each terminal voltage of lithium-ion-power cell；
Fig. 4 is the structural schematic diagram of lithium-ion-power cell closed loop detecting system of the embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is suggested about the method for batteries of electric automobile internal short-circuit currently, having some.For example, a kind of threshold test side
Method, specifically when vehicle runs or charges again, whether the minimum voltage for detecting battery is less than setting value and continues pre- timing
Between, judge whether short circuit；It is for another example true by the running parameter and look-up-table function of application least square method calculating battery cell
Determine the fault level of battery；For another example the method based on threshold test is proposed by judging between each terminal voltage and average voltage
Deviation whether more than security restriction come judge battery whether there is internal short-circuit security risk.Three above method exists following
Disadvantage, first they cannot eliminate interference caused by acquisition noise, cause fault diagnosis effect unstable；Secondly they cannot
Position occurs for expliciting the position failure, and subsequent artefacts is needed to detect, of high cost, efficiency is low；In addition least square method is applied to calculate electricity
Pond parameter is more demanding to sampled data, the generation for causing failure to be judged by accident.
Therefore, in order to overcome the technical drawbacks described above, the present invention provides a kind of power battery internal short-circuit detection method and
System, the terminal voltage design data for innovatively being acquired battery pack are a closed-loop system, compensate for current power battery
The deficiency of internal short-circuit detection method simplifies the required hardware facility of traditional circuit fault detect, reduces equipment cost,
Application range is expanded, while the advantages of present invention simply easily realizes ensures power battery reliability and safety in use
Property.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Below in conjunction with attached drawing, further details of theory is made to the lithium-ion-power cell internal short-circuit detection method of the present invention
It is bright.It should be appreciated that described herein, specific examples are only used to explain the present invention is not intended to limit the present invention.It needs to illustrate
, in the absence of conflict, the features in the embodiments and the embodiments of the present application can be combined with each other.
Embodiment one
Fig. 1 is the flow diagram of power battery internal short-circuit detection method of the embodiment of the present invention, as shown in Figure 1, a kind of
Power battery internal short-circuit detection method, the power battery internal short-circuit detection method specifically include following steps：
Step 101：Acquire the terminal voltage of each battery pack in power battery；The power battery includes the n batteries
Group.
Step 102：Judge whether each terminal voltage is more than voltage threshold, obtains the first judging result；If described
One judging result indicates that the terminal voltage is more than the voltage threshold, thens follow the steps 103；If first judging result indicates
All terminal voltages, which are respectively less than, is equal to the voltage threshold, thens follow the steps 104.
Step 103：When judging whether the duration of all terminal voltages more than the voltage threshold is more than default
Between, obtain the second judging result.If second judging result indicates continuing for the terminal voltage more than the voltage threshold
Time is more than preset time, thens follow the steps 105；If second judging result indicates all institutes more than the voltage threshold
The duration for stating terminal voltage is less than or equal to the preset time, thens follow the steps 104.
Step 104：All terminal voltages are connected, occlusion detection model is built；The occlusion detection model includes n
The terminal voltage, and the terminal voltage of first battery pack is also connected with the terminal voltage of the last one battery pack.
Step 105：Determine that the power battery breaks down.
Step 106：The related coefficient between each adjacent two terminal voltage is calculated, and the related coefficient is determined as described
The detection coefficient of the corresponding battery pack of previous terminal voltage in two neighboring terminal voltage.
Step 107：Judge whether all detection coefficients are above given threshold, obtains third judging result；If institute
It states third judging result and indicates that all detection coefficients are above the given threshold, then follow the steps 108；If the third
Judging result indicates that all detection coefficients are not above the given threshold, thens follow the steps 109.
Step 108：It determines and short trouble does not occur inside the power battery.
Step 109：Battery pack corresponding to the detection coefficient not higher than the given threshold is determined as occurring short
The battery pack of road failure, and preserve the terminal voltage for the battery pack that short trouble occurs.
Wherein step 106 specifically includes：
Using related coefficient algorithm, the related coefficient of each adjacent two terminal voltage is calculated, and the related coefficient is determined
For the detection coefficient of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage.
Preferably, the given threshold is 0.75.Ranging from 2.0V~3.65V of the voltage threshold.When described default
Between be 1 minute.
Embodiment two
To achieve the above object, the present invention also provides a kind of power battery internal short-circuit detecting systems.
Fig. 2 is the structural schematic diagram of power battery internal short-circuit detecting system of the embodiment of the present invention, as shown in Fig. 2, described
Power battery internal short-circuit detecting system includes：
Terminal voltage acquisition module 201, the terminal voltage for acquiring each battery pack in power battery；The power battery pack
Include the n battery packs.
First judging result obtains module 202, for judging whether each terminal voltage is more than voltage threshold, obtains the
One judging result.
Second judging result obtains module 203, for indicating the terminal voltage more than described when first judging result
When voltage threshold, judge whether the duration of all terminal voltages more than the voltage threshold is more than preset time, obtains
To the second judging result.
Occlusion detection model construction module 204, for indicating that all terminal voltages are small when first judging result
In indicating holding for all terminal voltages more than the voltage threshold equal to the voltage threshold or second judging result
When the continuous time is less than or equal to the preset time, all terminal voltages are connected, occlusion detection model is built；The closure inspection
It includes the n terminal voltages to survey model, and the terminal voltage of first battery pack is also connected with the terminal voltage of the last one battery pack
It connects.
Power battery breaks down determining module 205, for indicating to be more than the voltage threshold when second judging result
When the duration of the terminal voltage of value is more than preset time, determine that the power battery breaks down.
Related coefficient computing module 206, for calculating the related coefficient between each adjacent two terminal voltage, and by the phase
Relationship number is determined as the detection coefficient of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage.
Third judging result obtains module 207, for judging whether all detection coefficients are above given threshold, obtains
To third judging result.
Short trouble determining module 208 does not occur inside power battery, for indicating all when the third judging result
When the detection coefficient is above the given threshold, determines and short trouble does not occur inside the power battery.
Short trouble battery pack determining module 209 occurs, for indicating all detections when the third judging result
It is when coefficient is not above the given threshold, the battery pack corresponding to the detection coefficient not higher than the given threshold is true
It is set to the battery pack that short trouble occurs, and preserves the terminal voltage for the battery pack that short trouble occurs.
The related coefficient computing module 206, specifically includes：
Related coefficient computing unit calculates the correlation between each adjacent two terminal voltage for using related coefficient algorithm
Coefficient, and the inspection for the corresponding battery pack of the previous terminal voltage related coefficient being determined as in the two neighboring terminal voltage
Survey coefficient.
Preferably, the given threshold is 0.75.Ranging from 2.0V~3.65V of the voltage threshold.When described default
Between be 1 minute.
Embodiment three
An embodiment of the present invention provides a kind of lithium-ion-power cell internal short-circuit detection methods, for detecting lithium ion power
Whether battery occurs internal short-circuit phenomenon, occurs to avoid serious accident is caused.
Fig. 3 is the structural schematic diagram for the device that the embodiment of the present invention acquires each terminal voltage of lithium-ion-power cell；Such as Fig. 3
It is shown, due to built-in 42 battery packs of lithium-ion-power cell packet used by the electric vehicle, that is, acquire 42 terminal voltages.By
In battery voltage acquisition chip at most 12 groups of battery voltages of detection, it is therefore desirable to four battery voltage acquisition chips,
In three battery voltage acquisition chips acquire 36 battery voltages, remaining 6 battery packs also need to a battery pack electricity
Acquisition chip is pressed, so this battery voltage acquisition chip also needs to while detecting 6 battery packs inside the battery pack
Detect 6 battery voltages inside another battery pack.
By taking the lithium-ion-power cell packet of an electric vehicle and BnS voltage systems as an example, illustrate short in power battery
Road detecting step.
The first step, BnS acquire the terminal voltage of each battery pack in power battery.
Second step judges whether the terminal voltage of the acquisition has been more than voltage threshold, if the terminal voltage of acquisition is more than setting
Voltage threshold and duration are more than preset time, then carry out fault alarm；The electricity if the terminal voltage acquired is in voltage threshold
Positive pressure is normal, carries out power battery internal short-circuit detection.
Third walks, and according to the terminal voltage value of the terminal voltage value and second battery pack of collected first battery pack, adopts
With related coefficient algorithm, the related coefficient of first battery pack is calculated, by the terminal voltage value of second battery pack and third electricity
The terminal voltage value of pond group, calculate second pair of battery pack related coefficient, and so on, by the terminal voltage of the last one battery pack with
The terminal voltage value of first battery pack calculates the related coefficient of the last one battery pack, therefore, entire detection process form as
Closed loop detecting system shown in Fig. 4.The number of related coefficient is consistent with the number of battery pack terminal voltage.
Terminal voltage is the voltage at battery pack both ends.The preset value time is set as 1 minute, and voltage threshold is set as battery charge and discharge
Point blanking voltage, the different battery materials blanking voltage is different, the voltage threshold range setting of battery in the embodiment of the present invention
For [2.0V 3.65V].
BnS acquires terminal voltage { V1；V2；V3；…；Vn }, correspond to related coefficient be ICC1,2；ICC2,3；…；ICCn,
1}。
If related coefficient ICCn, 1 and ICC1,2 detect failure problems, then it can quickly navigate to first battery pack and go out
Existing internal short-circuit failure, and so on, if related coefficient ICC5,6 and ICC6,7 detect failure problems, then can navigate to rapidly
There is internal short-circuit failure in 6th battery pack.
Overall failure testing process and based on related coefficient battery pack internal short-circuit detection method it is as shown in Figure 1.
The related coefficient implemented for this example works as coefficient using interclass correlation coefficient according to the principle of the related coefficient
When value is less than 0.75, it is believed that the failure phenomenon thinks normal higher than 0.75.
If each pair of battery pack related coefficient is higher than set threshold value in battery pack, ignore the information of voltage of battery.If electric
Each pair of battery pack related coefficient is less than set threshold value in the packet of pond, then the information of voltage for preserving battery is concurrently out of order alarm, ties
Beam internal short-circuit testing process.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
Principle and implementation of the present invention are described for specific case used herein, and above example is said
The bright method and its core concept for being merely used to help understand the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (7)
1. a kind of power battery internal short-circuit detection method, which is characterized in that the power battery internal short-circuit detection method packet
It includes：
Acquire the terminal voltage of each battery pack in power battery；The power battery includes the n battery packs；
Judge whether each terminal voltage is more than voltage threshold, obtains the first judging result；
If first judging result indicates that the terminal voltage is more than the voltage threshold, judge all more than the voltage threshold
Whether the duration of the terminal voltage of value is more than preset time, obtains the second judging result；
If first judging result, which indicates that all terminal voltages are respectively less than, is equal to the voltage threshold, by all ends
Voltage Series build occlusion detection model；The occlusion detection model includes n terminal voltages, and first battery pack
Terminal voltage is also connected with the terminal voltage of the last one battery pack；
If second judging result indicates that the duration of the terminal voltage more than the voltage threshold is more than preset time,
Then determine that the power battery breaks down；
If second judging result indicates that the duration of all terminal voltages more than the voltage threshold is less than or equal to
All terminal voltages are then connected, build occlusion detection model by the preset time；
The related coefficient between each adjacent two terminal voltage is calculated, and the related coefficient is determined as the two neighboring end electricity
The detection coefficient of the corresponding battery pack of previous terminal voltage in pressure；
Judge whether all detection coefficients are above given threshold, obtains third judging result；
If the third judging result indicates that all detection coefficients are above the given threshold, it is determined that the power electric
Short trouble does not occur inside pond；
If the third judging result indicates that all detection coefficients are not above the given threshold, will be not higher than described
Battery pack corresponding to the detection coefficient of given threshold is determined as that the battery pack of short trouble occurs, and preserves generation short circuit
The terminal voltage of the battery pack of failure.
2. power battery internal short-circuit detection method according to claim 1, which is characterized in that described to calculate per adjacent two
Related coefficient between a terminal voltage, and the related coefficient is determined as the electricity of the previous end in the two neighboring terminal voltage
The detection coefficient for pressing corresponding battery pack, specifically includes：
Using related coefficient algorithm, the related coefficient between each adjacent two terminal voltage is calculated, and the related coefficient is determined
For the detection coefficient of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage.
3. power battery internal short-circuit detection method according to claim 1, which is characterized in that the given threshold is
0.75。
4. power battery internal short-circuit detection method according to claim 1, which is characterized in that the model of the voltage threshold
It encloses for 2.0V~3.65V.
5. power battery internal short-circuit detection method according to claim 1, which is characterized in that the preset time is 1
Minute.
6. a kind of power battery internal short-circuit detecting system, which is characterized in that the power battery internal short-circuit detecting system packet
It includes：
Terminal voltage acquisition module, the terminal voltage for acquiring each battery pack in power battery；The power battery includes n institute
State battery pack；
First judging result obtains module, for judging whether each terminal voltage is more than voltage threshold, obtains the first judgement
As a result；
Second judging result obtains module, for indicating that the terminal voltage is more than the voltage threshold when first judging result
When, judge whether the duration of all terminal voltages more than the voltage threshold is more than preset time, obtains second and sentence
Disconnected result；
Occlusion detection model construction module, for being equal to institute when first judging result indicates that all terminal voltages are respectively less than
It states voltage threshold or second judging result indicates that the duration of all terminal voltages more than the voltage threshold is small
When equal to the preset time, all terminal voltages are connected, occlusion detection model is built；The occlusion detection model packet
The n terminal voltages are included, and the terminal voltage of first battery pack is also connected with the terminal voltage of the last one battery pack；
Power battery breaks down determining module, for indicating described more than the voltage threshold when second judging result
When the duration of terminal voltage is more than preset time, determine that the power battery breaks down；
Related coefficient computing module, for calculating the related coefficient between each adjacent two terminal voltage, and by the related coefficient
It is determined as the detection coefficient of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage；
Third judging result obtains module, for judging whether all detection coefficients are above given threshold, obtains third
Judging result；
Short trouble determining module does not occur inside power battery, for indicating all detections when the third judging result
When coefficient is above the given threshold, determines and short trouble does not occur inside the power battery；
Short trouble battery pack determining module occurs, for indicating that all detection coefficients are not equal when the third judging result
When higher than the given threshold, the battery pack corresponding to the detection coefficient not higher than the given threshold is determined as occurring
The battery pack of short trouble, and preserve the terminal voltage for the battery pack that short trouble occurs.
7. power battery internal short-circuit detecting system according to claim 6, which is characterized in that the related coefficient calculates
Module specifically includes：
Related coefficient computing unit, for using related coefficient algorithm, calculating the related coefficient between each adjacent two terminal voltage,
And the related coefficient is determined as to the detection system of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage
Number.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983034A (en) * | 2018-10-26 | 2018-12-11 | 北京经纬恒润科技有限公司 | A kind of internal short-circuit detection method and device |
| CN110376530A (en) * | 2019-08-08 | 2019-10-25 | 清华大学 | Battery internal short-circuit detection device and method |
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