CN108987828A - Battery management system, vehicle and its welding battery method for detecting abnormality, device - Google Patents
Battery management system, vehicle and its welding battery method for detecting abnormality, device Download PDFInfo
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- CN108987828A CN108987828A CN201810789557.6A CN201810789557A CN108987828A CN 108987828 A CN108987828 A CN 108987828A CN 201810789557 A CN201810789557 A CN 201810789557A CN 108987828 A CN108987828 A CN 108987828A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of battery management system, vehicle and its welding battery method for detecting abnormality, device, wherein method includes: to identify the welds types of battery pack in vehicle；If welds types is series connection welding, when the difference of the current voltage of the current voltage and battery pack of single battery is greater than the first preset value, determine that there are abnormal weldings for battery pack；And if welds types is welding in parallel, the current pressure drop value of battery pack is obtained, and when current pressure drop value is greater than or equal to the second preset value, determine that there are abnormal weldings for battery pack.This method can effectively determine that battery pack with the presence or absence of abnormal welding, effectively improves the safety of battery pack, reduces the generation of security risk.
Description
Technical field
The present invention relates to technical field of vehicle, in particular to a kind of battery management system, vehicle and its welding battery are abnormal
Detection method, device.
Background technique
In the related technology, whether battery group welding is only detected before battery pack factory extremely, after factory
Detection is not will do it.
However, if occurring abnormal welding in battery pack, it is easy to appear security risk after battery pack factory, such as a string
More battery packs simultaneously, tail off, internal current can become larger, and substantially reduce the longevity of battery pack if weld falls off to be easy to cause and count
Life；Such as busbar connector abnormal welding between going here and there and going here and there in battery pack, easily causes major loop open circuit or contact resistance becomes larger, lead to electricity
The temperaturing lifting abnormality of pond group, it would be highly desirable to solve.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
First purpose be to propose a kind of welding battery method for detecting abnormality of vehicle, and whether this method effectively can determine battery pack
There are abnormal weldings, effectively improve the safety of battery pack, reduce the generation of security risk.
Second object of the present invention is to propose a kind of welding battery abnormal detector of vehicle.
Third object of the present invention is to propose a kind of battery management system.
Fourth object of the present invention is to propose a kind of vehicle.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of welding battery abnormality detection side of vehicle
Method, comprising the following steps: the welds types of battery pack in identification vehicle；If the welds types is series connection welding, in list
When the sum of current voltage of body battery and the difference of the current voltage of the battery pack are greater than the first preset value, the battery is determined
There are abnormal weldings for group；And if the welds types is welding in parallel, the current pressure drop value of the battery pack is obtained, and
When the current pressure drop value is greater than or equal to the second preset value, determine that there are abnormal weldings for the battery pack.
The welding battery method for detecting abnormality of the vehicle of the embodiment of the present invention can be series connection welding in welds types, and
When the difference of the current voltage of the current voltage and battery pack of single battery is greater than the first preset value, determine that battery pack has welding
It is abnormal；It and in welds types is welding in parallel, and when the voltage drop value of current battery is greater than or equal to the second preset value, determine
There are abnormal weldings for battery pack, so that anticipation battery pack whether there is abnormal welding situation in advance, avoid further security risk,
In the service life for extending battery pack, the safety of battery pack is effectively improved, the generation of security risk is reduced.
In addition, the welding battery method for detecting abnormality of vehicle according to the above embodiment of the present invention can also have it is following attached
The technical characteristic added:
Further, in one embodiment of the invention, before identifying the welds types, further includes: detection institute
State the current working of battery pack；If the current working is charging operating condition, and the current state-of-charge of the battery pack is greater than
First preset threshold then identifies the welds types；If the current working is electric discharge operating condition, and the battery pack is current
State-of-charge is greater than the second preset value, then identifies the welds types, wherein it is pre- that first preset threshold is greater than described second
If threshold value.
Further, in one embodiment of the invention, it is also wrapped in the judgement battery pack there are after abnormal welding
It includes: sending battery maintenance and remind, and control vehicle and maintain current working；And/or when the voltage drop value is greater than third preset value,
Stop Vehicular charging, wherein the third preset value is greater than second preset value.
Further, in one embodiment of the invention, the welding battery method for detecting abnormality of above-mentioned vehicle, is also wrapped
It includes: obtaining the abnormal cumulative number of the battery pack；When the abnormal cumulative number is greater than preset times, battery failure is sent
Warning；Failure degree is obtained according to the difference of the voltage drop value and second preset value, to obtain according to the failure degree
The transmission form of the battery failure warning.
Further, in one embodiment of the invention, the current pressure drop value for obtaining the battery pack, further
It include: that reference voltage is obtained according to the Current Temperatures of the battery pack, current flow and current state-of-charge；According to the monomer
The current voltage of battery and the reference voltage obtain the voltage drop value.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of welding battery abnormality detection dress of vehicle
Set, comprising: identification module, for identification in vehicle battery pack welds types；First determination module, in the welding class
Type is series connection welding, and the difference of the current voltage of single battery and the current voltage of the battery pack is greater than the first preset value
When, determine that there are abnormal weldings for the battery pack；And second determination module, for being welding in parallel in the welds types
When, the current pressure drop value of the battery pack is obtained, and when the current pressure drop value is greater than or equal to the second preset value, determine institute
Stating battery pack, there are abnormal weldings.
The welding battery abnormal detector of the vehicle of the embodiment of the present invention can be series connection welding in welds types, and
When the difference of the current voltage of the current voltage and battery pack of single battery is greater than the first preset value, determine that battery pack has welding
It is abnormal；It and in welds types is welding in parallel, and when the voltage drop value of current battery is greater than or equal to the second preset value, determine
There are abnormal weldings for battery pack, so that anticipation battery pack whether there is abnormal welding situation in advance, avoid further security risk,
In the service life for extending battery pack, the safety of battery pack is effectively improved, the generation of security risk is reduced.
In addition, the welding battery abnormal detector of vehicle according to the above embodiment of the present invention can also have it is following attached
The technical characteristic added:
Further, in one embodiment of the invention, before the identification module identifies the welds types, also
It include: detection unit, for detecting the current working of the battery pack；First recognition unit, for being in the current working
Charge operating condition, and the current state-of-charge of the battery pack be greater than the first preset threshold when, identify the welds types；Second knows
Other unit, for being electric discharge operating condition in the current working, and the current state-of-charge of the battery pack is greater than the second preset value
When, identify the welds types, wherein first preset threshold is greater than second preset threshold.
Further, in one embodiment of the invention, determine that the battery pack has welding in the judging unit
It after exception, is also used to: sending battery maintenance and remind, and control vehicle and maintain current working；And/or it is greater than in the voltage drop value
When third preset value, stop Vehicular charging, wherein the third preset value is greater than second preset value.
Further, in one embodiment of the invention, the welding battery abnormal detector of above-mentioned vehicle, is also wrapped
Include: first obtains module, for obtaining the abnormal cumulative number of the battery pack；Sending module, for accumulative in the exception
When number is greater than preset times, battery failure warning is sent；Second obtains module, for according to the voltage drop value and described second
The difference of preset value obtains failure degree, obtains in the form of the transmission of battery failure warning by according to the failure degree.
Further, in one embodiment of the invention, second determination module further comprises: according to described
Current Temperatures, current flow and the current state-of-charge of battery pack obtain reference voltage；According to the current electricity of the single battery
Pressure and the reference voltage obtain the voltage drop value.
In order to achieve the above objectives, third aspect present invention embodiment proposes a kind of battery management system comprising above-mentioned
Vehicle welding battery abnormal detector.The battery management system can prejudge battery pack with the presence or absence of abnormal welding in advance
Situation avoids further security risk, extends the service life of battery pack, effectively improves the safety of battery pack, reduces security risk
Generation.
In order to achieve the above objectives, fourth aspect present invention embodiment proposes a kind of vehicle comprising above-mentioned vehicle
Welding battery abnormal detector.The vehicle can prejudge battery pack with the presence or absence of abnormal welding situation in advance, avoid further
Security risk extends the service life of battery pack, effectively improves the safety of battery pack, reduces the generation of security risk.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the flow chart according to the welding battery method for detecting abnormality of the vehicle of the embodiment of the present invention；
Fig. 2 is the flow chart according to the welding battery method for detecting abnormality of the vehicle of a specific embodiment of the invention；
Fig. 3 is the structural schematic diagram according to the welding battery abnormal detector of the vehicle of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
It is different that the battery management system proposed according to embodiments of the present invention, vehicle and its welding battery are described with reference to the accompanying drawings
Normal detection method, device, the welding battery for describing the vehicle proposed according to embodiments of the present invention with reference to the accompanying drawings first are examined extremely
Survey method.
Fig. 1 is the flow chart of the welding battery method for detecting abnormality of the vehicle of the embodiment of the present invention.As shown in Figure 1, the vehicle
Welding battery method for detecting abnormality the following steps are included:
In step s101, the welds types of battery pack in vehicle is identified.
With the development of batteries of electric automobile, the battery pack of electrokinetic cell system is minimum combination, battery core in battery pack
Connection is all by welding, bolt connecting mode, but in vehicle operation, if the welding appearance of battery pack is different in vehicle
Often, it is easy to produce security risk, for example, tail off for the battery pack more than a string simultaneously if weld falls off to be easy to cause and count,
The battery pack electric current to be born can be beyond regulation, so that the service life to battery pack has an impact.Common welds types is generally
Series connection welding or welding in parallel, therefore, can identify the welding class of battery pack in vehicle by Vehicular battery management system
Type, when as equal such as single battery electric current, as series connection welding is welding in parallel when voltage is equal, and then can be according to series connection
Welding or welding in parallel accurately detect battery pack, to improve the accuracy of detection.
It is specific that how according to type weld type decision battery pack, there are abnormal weldings to be further explained below.
In step s 102, if welds types is series connection welding, in the sum of current voltage of single battery and battery
When the difference of the current voltage of group is greater than the first preset value, determine that there are abnormal weldings for battery pack.
Here, determining whether that there are abnormal weldings to be described in detail to the battery pack that welds types is series connection welding.
In normal conditions, if the welds types of battery pack is series connection welding, the single battery in battery pack it is current
The summation of voltage should be equal with the current voltage of battery pack, wherein the current voltage and electricity of the single battery in battery pack
The current voltage of pond group can be measured by voltage sensor, therefore, can be to the current voltage of the single battery in battery pack
Read group total is carried out, and asks poor with the current voltage of battery pack, to determine that battery pack is deposited when difference is greater than certain value (such as 3V)
In abnormal welding.
For example, being U by the current voltage that voltage sensor measures battery packBattery pack, the current voltage of single battery is
USingle battery, then the sum of current voltage of all single batteries in battery pack is ∑ USingle battery, therefore, can be sentenced by following formula
There are abnormal weldings for disconnected battery pack:
|UBattery pack-∑USingle battery| >=3V,
If above-mentioned difference is greater than 3V, illustrating battery pack, there are abnormal weldings.
In step s 103, if welds types is welding in parallel, the current pressure drop value of battery pack is obtained, and current
When voltage drop value is greater than or equal to the second preset value, determine that there are abnormal weldings for battery pack.
Here, determining whether that there are abnormal weldings to be described in detail to the battery pack that welds types is welding in parallel.
When welds types is welding in parallel, internal resistance when in parallel be internal resistance of single cell inverse and, therefore, Ke Yi
When current pressure drop value is greater than or equal to certain value, determine that there are abnormal weldings for battery pack, it may be assumed that
| B1 | >=n/n-1；
Wherein, n is number of parallel, and ratio is bigger, then it represents that abnormal welding problem is more serious.
Further, in one embodiment of the invention, the current pressure drop value for obtaining battery pack further comprises: root
Reference voltage is obtained according to the Current Temperatures of battery pack, current flow and current state-of-charge；According to the current voltage of single battery
Voltage drop value is obtained with reference voltage.
It is understood that the current pressure drop value of battery pack can be obtained by the current voltage and reference voltage of single battery
It takes, reference voltage can be obtained according to the Current Temperatures of battery pack, current flow and current state-of-charge, it may be assumed that
B1=(USingle battery-UStandard 1)/(UStandard 1-UStandard 0)；
It should be noted that UStandard 0And UStandard 1For reference voltage, which can be obtained by actual test,
It is U when such as the current flow of battery pack being 0Standard 0, the present current value of battery pack is U when not being 0Standard 1.Wherein, the reference
Voltage is as shown in table 1.
Table 1
It should be noted that table 1 is that the calibration value carried out when abnormal welding is not present in battery pack；It is under different temperatures
(such as 25 DEG C, 0 DEG C, -5 DEG C), different electric currents, reference voltage when different current state-of-charge；Column are not demarcated or are not embodied in
Reference voltage value on table is less redundancy, is not described in detail herein if it is desired, can be sought using interpolation method.
Further, in one embodiment of the invention, before identifying welds types, further includes: detect the current work of battery pack
Condition；If current working is charging operating condition, and the current state-of-charge of battery pack is greater than the first preset threshold, then identifies welding class
Type；If current working is electric discharge operating condition, and the current state-of-charge of battery pack is greater than the second preset value, then identifies welding class
Type, wherein the first preset threshold is greater than the second preset threshold.
It is understood that can carry out information collection to battery pack before identifying welds types, such as be passed by voltage
Sensor acquires the voltage of battery pack, and the electric current of battery pack is acquired by current sensor, acquires battery pack by temperature sensor
Temperature etc., to judge the current working of battery pack according to above- mentioned information acquisition, wherein the operating condition of battery pack mainly has battery charger
Condition and electric discharge operating condition.
If the current working of battery pack is charging operating condition, the current state-of-charge of battery pack can be further judged, and
And when the current state-of-charge of battery pack is greater than certain value, as the current state-of-charge of battery pack is greater than 80% or battery
The current state-of-charge of group is greater than 90%, then carries out judgement identification welds types；
If the current working of battery pack is electric discharge operating condition, the current state-of-charge of battery pack can be further judged, and
And when the current state-of-charge of battery pack is greater than certain value, as the current state-of-charge of battery pack is greater than 30% or battery
The current state-of-charge of group is greater than 40%, then carries out judgement identification welds types；
It is understood that the first above-mentioned preset threshold is greater than the second preset threshold, and the first preset threshold and second
The size of preset threshold can be set according to the actual situation by those skilled in the art, be not specifically limited herein.
Further, in one embodiment of the invention, determining battery pack, there are after abnormal welding, further includes:
It sends battery maintenance to remind, and controls vehicle and maintain current working；And/or when voltage drop value is greater than third preset value, stop vehicle
Charging, wherein third preset value be greater than the second preset value.
It is understood that in judgement battery pack fault-signal can be issued, to remind correlation there are after abnormal welding
Personnel, for example, can by sent with voice prompting battery maintenance remind, then setting light come indicate battery need into
Row maintenance, and control vehicle and maintain current working, vehicle driving or charged state are such as kept, it specifically can be by art technology
Personnel set according to the actual situation, are not particularly limited herein.
In addition, when voltage drop value is greater than certain value, then it represents that temperature is excessively high at this time, needs to stop Vehicular charging, wherein the
Three preset values can be as shown in table 2,
Table 2
| N | 2 | 3 | 4 | 5 | 6 | N (is greater than 6) |
| B1 | 1 | 3 | 2 | 2.5 | 2 | n/3 |
When being greater than certain value due to voltage drop value, it is easy to appear security risk therefore, for safety problem, needs according to strategy text
Shelves execute, and the strategy and anticipation are only as maintenance foundation.
Further, in one embodiment of the invention, the welding battery method for detecting abnormality of above-mentioned vehicle, is also wrapped
It includes: obtaining the abnormal cumulative number of battery pack；When abnormal cumulative number is greater than preset times, battery failure warning is sent；Root
Failure degree is obtained according to the difference of voltage drop value and the second preset value, to obtain the transmission shape of battery failure warning according to failure degree
Formula.
It is understood that the abnormal cumulative number of battery pack can be obtained by counter, when detecting battery pack
It is primary to there is primary abnormal then record, when abnormal cumulative number is greater than certain value (such as 4 times), then sends battery failure warning, and
Failure degree is obtained according to the difference of voltage drop value and the second preset value, to obtain the transmission of battery failure warning according to failure degree
Form.For example, battery pack connecting fault, battery pack abnormal welding.
As shown in Fig. 2, in one particular embodiment of the present invention, the welding battery abnormality detection side of above-mentioned vehicle
Method, comprising the following steps:
S201 acquires the voltage, electric current and temperature of battery pack.
S202 detects the current working of battery pack, if the current working of battery pack is charging operating condition, thens follow the steps
S203 thens follow the steps S204 if the current working of battery pack is electric discharge operating condition.
It is pre- further to judge that the current state-of-charge of battery pack is greater than first if current working is charging operating condition by S203
If threshold value, and jump and execute step S205.
It is pre- further to judge that the current state-of-charge of battery pack is greater than second if current working is electric discharge operating condition by S204
If threshold value.
S205 identifies the welds types of battery pack in vehicle, if welds types is series connection welding, thens follow the steps
S206 thens follow the steps S207 if welds types is welding in parallel.
S206, if welds types is series connection welding, in the current voltage of single battery and the current voltage of battery pack
Difference be greater than the first preset value when, determine battery pack there are abnormal weldings.
S207 obtains the current pressure drop value of battery pack, and big in current pressure drop value if welds types is welding in parallel
When the second preset value, determine that there are abnormal weldings for battery pack.
S208 obtains the abnormal cumulative number of battery pack, and when abnormal cumulative number is greater than preset times, sends battery
Failure warning.
The welding battery method for detecting abnormality of the vehicle proposed according to embodiments of the present invention can be series connection in welds types
Welding, and the difference of the current voltage of the current voltage and battery pack of single battery be greater than the first preset value when, determine battery pack
There are abnormal weldings；And it is welded in welds types to be in parallel, and the voltage drop value of current battery is greater than or equal to second and presets
When value, determine that there are abnormal weldings for battery pack, so that anticipation battery pack whether there is abnormal welding situation in advance, avoids further
Security risk extends the service life of battery pack, effectively improves the safety of battery pack, reduces the generation of security risk.
Referring next to the welding battery abnormal detector for the vehicle that attached drawing description proposes according to embodiments of the present invention.
Fig. 3 is the structural schematic diagram of the welding battery abnormal detector of the vehicle of the embodiment of the present invention.As shown in figure 3,
The welding battery abnormal detector 10 of the vehicle includes: identification module 100, the first determination module 200 and the second determination module
300。
Wherein, identification module 100 for identification in vehicle battery pack welds types.First determination module 200 is used for
Welds types is series connection welding, and the difference of the current voltage of the current voltage and battery pack of single battery is greater than the first preset value
When, determine that there are abnormal weldings for battery pack.Second determination module 300 is used to obtain battery when welds types is welding in parallel
The current pressure drop value of group, and when current pressure drop value is greater than or equal to the second preset value, determine that there are abnormal weldings for battery pack.Root
It can effectively determine that battery pack with the presence or absence of abnormal welding, effectively improves the safety of battery pack according to the device 10 of the embodiment of the present invention
Property, reduce the generation of security risk.
Further, in one embodiment of the invention, the welding battery abnormal detector of above-mentioned vehicle, is also wrapped
Include: first obtains module, for obtaining the abnormal cumulative number of battery pack；Sending module, for being greater than in abnormal cumulative number
When preset times, battery failure warning is sent；Second obtains module, for being obtained according to the difference of voltage drop value and the second preset value
Failure degree, by according to failure degree obtain battery failure warning transmission in the form of.
Further, in one embodiment of the invention, the second determination module further comprises: according to battery pack
Current Temperatures, current flow and current state-of-charge obtain reference voltage；According to the current voltage and reference voltage of single battery
Obtain voltage drop value.
It should be noted that the explanation of the aforementioned welding battery method for detecting abnormality embodiment to vehicle is also applied for
The welding battery abnormal detector of the vehicle of the embodiment, details are not described herein again.
The welding battery abnormal detector of the vehicle proposed according to embodiments of the present invention can be series connection in welds types
Welding, and the difference of the current voltage of the current voltage and battery pack of single battery be greater than the first preset value when, determine battery pack
There are abnormal weldings；And it is welded in welds types to be in parallel, and the voltage drop value of current battery is greater than or equal to second and presets
When value, determine that there are abnormal weldings for battery pack, so that anticipation battery pack whether there is abnormal welding situation in advance, avoids further
Security risk extends the service life of battery pack, effectively improves the safety of battery pack, reduces the generation of security risk.
In addition, the embodiment of the present invention also proposed a kind of battery management system, which includes above-mentioned vehicle
Welding battery abnormal detector.The battery management system can prejudge battery pack with the presence or absence of abnormal welding shape in advance
Condition avoids further security risk, extends the service life of battery pack, effectively improves the safety of battery pack, reduces security risk
Occur.
In addition, the embodiment of the present invention also proposed a kind of vehicle, which includes that the welding battery of above-mentioned vehicle is abnormal
Detection device.The vehicle can prejudge battery pack with the presence or absence of abnormal welding situation in advance, avoid further security risk, extend
The service life of battery pack effectively improves the safety of battery pack, reduces the generation of security risk.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of welding battery method for detecting abnormality of vehicle, which comprises the following steps:
Identify the welds types of battery pack in vehicle；
If the welds types is series connection welding, in the current electricity of the sum of current voltage of single battery and the battery pack
When the difference of pressure is greater than the first preset value, determine that there are abnormal weldings for the battery pack；And
If the welds types is welding in parallel, the current pressure drop value of the battery pack is obtained, and in the current pressure drop
When value is greater than or equal to the second preset value, determine that there are abnormal weldings for the battery pack.
2. the welding battery method for detecting abnormality of vehicle according to claim 1, which is characterized in that identifying the welding
Before type, further includes:
Detect the current working of the battery pack；
If the current working is charging operating condition, and the current state-of-charge of the battery pack is greater than the first preset threshold, then
Identify the welds types；
If the current working is electric discharge operating condition, and the current state-of-charge of the battery pack is greater than the second preset value, then knows
The not described welds types, wherein first preset threshold is greater than second preset threshold.
3. the welding battery method for detecting abnormality of vehicle according to claim 1, which is characterized in that determining the battery
There are after abnormal welding for group, further includes:
It sends battery maintenance to remind, and controls vehicle and maintain current working；And/or
When the voltage drop value is greater than third preset value, stop Vehicular charging, wherein the third preset value is greater than described second
Preset value.
4. the welding battery method for detecting abnormality of vehicle according to claim 1, which is characterized in that further include:
Obtain the abnormal cumulative number of the battery pack；
When the abnormal cumulative number is greater than preset times, battery failure warning is sent；
Failure degree is obtained according to the difference of the voltage drop value and second preset value, to obtain institute according to the failure degree
State the transmission form of battery failure warning.
5. the welding battery method for detecting abnormality of vehicle according to claim 1, which is characterized in that described to obtain the electricity
The current pressure drop value of pond group further comprises:
Reference voltage is obtained according to the Current Temperatures of the battery pack, current flow and current state-of-charge；
The voltage drop value is obtained according to the current voltage of the single battery and the reference voltage.
6. a kind of welding battery abnormal detector of vehicle characterized by comprising
Identification module, for identification in vehicle battery pack welds types；
First determination module, for the welds types be series connection welding, and the sum of current voltage of single battery with it is described
When the difference of the current voltage of battery pack is greater than the first preset value, determine that there are abnormal weldings for the battery pack；And
Second determination module, for obtaining the current pressure drop value of the battery pack when the welds types is welding in parallel, and
When the current pressure drop value is greater than or equal to the second preset value, determine that there are abnormal weldings for the battery pack.
7. the welding battery abnormal detector of vehicle according to claim 6, which is characterized in that in the identification module
Before identifying the welds types, further includes:
Detection unit, for detecting the current working of the battery pack；
First recognition unit, for being charging operating condition in the current working, and the current state-of-charge of the battery pack is greater than
When the first preset threshold, the welds types is identified；
Second recognition unit, for being electric discharge operating condition in the current working, and the current state-of-charge of the battery pack is greater than
When the second preset value, the welds types is identified, wherein first preset threshold is greater than second preset threshold.
8. the welding battery abnormal detector of vehicle according to claim 6, which is characterized in that in the judging unit
Determine that the battery pack there are after abnormal welding, is also used to:
It sends battery maintenance to remind, and controls vehicle and maintain current working；And/or
When the voltage drop value is greater than third preset value, stop Vehicular charging, wherein the third preset value is greater than described second
Preset value.
9. a kind of battery management system, characterized by comprising as the battery of the described in any item vehicles of claim 6-8 welds
Connect abnormal detector.
10. a kind of vehicle characterized by comprising battery management system as claimed in claim 9.
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| CN201810789557.6A CN108987828A (en) | 2018-07-18 | 2018-07-18 | Battery management system, vehicle and its welding battery method for detecting abnormality, device |
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| CN201810789557.6A CN108987828A (en) | 2018-07-18 | 2018-07-18 | Battery management system, vehicle and its welding battery method for detecting abnormality, device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113655389A (en) * | 2020-05-12 | 2021-11-16 | 比亚迪股份有限公司 | Method and system for diagnosing connection state of power circuit of battery pack, storage medium, battery management system and vehicle |
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Application publication date: 20181211 |