CN108535660A - The detection device and its detection method of a kind of group of battery modules junction conduction - Google Patents
The detection device and its detection method of a kind of group of battery modules junction conduction Download PDFInfo
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- CN108535660A CN108535660A CN201810383064.2A CN201810383064A CN108535660A CN 108535660 A CN108535660 A CN 108535660A CN 201810383064 A CN201810383064 A CN 201810383064A CN 108535660 A CN108535660 A CN 108535660A
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- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 238000012360 testing method Methods 0.000 claims abstract description 91
- 239000000463 material Substances 0.000 claims abstract description 48
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000004458 analytical method Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 5
- 238000009659 non-destructive testing Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 2
- 238000003466 welding Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 229910000679 solder Inorganic materials 0.000 description 9
- 239000004411 aluminium Substances 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 230000005611 electricity Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
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- 238000002513 implantation Methods 0.000 description 1
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- 239000012212 insulator Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
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Abstract
The invention discloses the detection devices and its detection method of a kind of group of battery modules junction conduction, including tester, host computer and display, the output end of the tester and the input terminal of host computer are electrically connected, the output end of the host computer and the input terminal of display are electrically connected, the middle part interlocking of the tester has resistance test table and testing current table, the tester is connected with test positive electrode and test negative electrode respectively by the conducting wire being screwed on wiring knob, and the test positive electrode and the one end for testing negative electrode are all connected on base material.This kind invention will not damage weld pads, achieve the purpose that non-destructive testing, and by comparing the variation degree of workpiece resistance value under different electric currents by that can judge that group of battery modules connects the quality of conduction（That is the slope of linear line）With the difference of standard value, judges whether the conduction of junction is good, greatly eliminate influence of the other factors such as workpiece temperature to measurement data.
Description
Technical field
Electric detective technology field of the present invention, more particularly to the detection device of a kind of group of battery modules junction conduction and
Its detection method.
Background technology
Currently, lithium ion battery is due to excellent performance, in fields such as electric vehicle, stand-by power supply, mobile phone digitals
It finds broad application.Such as in electric vehicle field, battery modules by being formed by serial or parallel connection between multiple single battery cores, if
Mutual serial or parallel connection forms battery pack again between dry battery modules.
In the interconnection technique of group of battery modules, wire ultrasonic bond, resistance spot welding, Laser Welding are with extensive.For example, making
It with aluminium wire ultrasound welding technology, can be passed through with the electric current in allowable range, when occurring will to fuse when short circuit generates overcurrent, be protected
Protecting other batteries connected in parallel being capable of normal use；Resistance spot welding technique may be implemented between battery core pin plate and bonding jumper
Connection；Laser welding can facilitate the connection realized between geometry proximate matter.
For aluminium wire ultrasonic bond, since under ul-trasonic irradiation, the oxidation film of aluminium surface is destroyed, be conducive to welding into
Row.However, after the oxidation film of aluminium material surface is destroyed, it is possible to reuniting in welded seam area, it will to the conduction of junction
It has an impact；For the resistance spot welding in battery core pin plate, since the time of spot welding is very short, it will appear at a small number of solder joints
The phenomenon that rosin joint, can also influence the conduction of solder joint；For Laser Welding, since the assembly between various geometry proximate matters can exist
Gap, it will make the position of Laser Welding shift, the conduction of solder joint but will be influenced.
Therefore, in actual production, in order to ensure the good connection between each group of battery modules, between each welding node
The inspection of conduction will be particularly important.
At present in production the detection method that mainly uses for tensile test method, i.e., to the solder joint of aluminium wire postwelding application one by
Gradually increased pulling force, when pulling force increases to authorized pressure, solder joint is unbroken, indicates that welding quality is good；If solder joint is broken, say
Bright Joint Strength does not reach requirement.Adopt this method that there are two kinds of deficiencies：1, inefficient：Each aluminium wire is carried out slow
It is long to expend the time for increased tensile test.2, destruction easily is generated to welding material：Pulling force is applied to solder joint after welding, is easy to make
Aluminium wire and its material deformation being connected.
There are when the defects of stomata, crackle inside aluminium wire weldering solder joint, will be changed by the electric current of solder joint, voltage.
It is proposed in patent ZL2017109369388 by weldment to be measured progress constant temperature processing, the electric current and voltage of 2 points of re-test weld seam,
To judge the reliability of welding point.But the method be used in group of battery modules conduction detection in there will be following
Problem：1) constant temperature processing is difficult to realize：In actual production environment temperature can moment variation, while with the progress of galvanization,
Workpiece temperature can also increase, and the variation of temperature will also influence the variation of electric current, therefore keep the temperature of workpiece constant, technique
Trouble, influences efficiency.2) contact resistance error influences big：Electrode needle is in contact with element, due to surface metal oxidization film, chlorination
Object, sulfide and each organic molecular species, adsorbed gas and other pollutants can be formed in contact surface, these films play
The effect of insulator generates contact resistance.The contact resistance generates measurement error for electric current and voltage-sensitive；Small electronic
The electrical parameter numerical value of element is minimum, directly measures the electrical parameter of junction, and the minimum error of generation is final by extreme influence
As a result judgement..
Invention content
The main purpose of the present invention is to provide a kind of detection device of group of battery modules junction conduction and its detections
Method can effectively solve the problems in background technology.
To achieve the above object, the technical solution that the present invention takes is：
The detection device and its detection method of a kind of group of battery modules junction conduction, including tester, host computer
And display, the input terminal of the output end of the tester and host computer are electrically connected, the output end of the host computer with
The input terminal of display is electrically connected, and the middle part interlocking of the tester has resistance test table and testing current table, the test
Instrument is connected with test positive electrode and test negative electrode respectively by the conducting wire that is screwed on wiring knob, the test positive electrode with
One end of test negative electrode is all connected on base material, and weld seam is provided between the two neighboring base material, is led between the weld seam
It crosses wire to be connected, the test positive electrode and the other end for testing negative electrode are connected with group of battery modules.
Further, the base material includes plate-like type base material and cylindrical type base material, and the weld seam is set to cylindrical type base material
Periphery.
Further, there are four the test negative electrode is arranged altogether, and the test negative electrode is set to cylindrical type base material
On.
Further, there are four the test positive electrode is arranged altogether, and the test positive electrode is set to plate-like type base material
Four corners.
Further, the electric current being passed through between the test positive electrode and test negative electrode is not less than 1A.
A kind of detection method of group of battery modules junction conduction, including group of battery modules and tester and following step
Suddenly：
1) different size of electric current is connected at the both ends of position to be measured in group of battery modules, and location is waited in group of battery modules
Different size of electric current is connected at the both ends set, and record current value is I1, I2, I3, I4；
2) resistance for testing position to be measured under different electric currents, the both ends of position to be measured are connected different big in group of battery modules
After small electric current, the resistance under current flow is recorded, and it is R1, R2, R3, R4, group of battery modules junction electricity to record resistance value
The measurement of resistance value can be measured using tester (5)；
3) make linear map analysis to compare.
Further, make linear map analysis in the step 3) to be compared as follows：
A, using current value as abscissa, resistance value is that ordinate makees linear graph, and figure can be by host computer and aobvious
Show in device and show, and calculates its slope；
B, the calibration slope value of the calculated slope sample excellent with conduction is made comparisons, in scheduled slope range,
It is considered as that conduction is good, the conduction for being otherwise considered as position to be measured is poor.
Further, the formula that the host computer is used to calculate slope is k=I/R, and wherein k is slope, and I is electric current, R
For resistance, and the host computer can also carry out the calculating and storage of slope value.
Further, the display is used for the display of linear graph.
Compared with prior art, the present invention has the advantages that：This kind is invented, and reasonable design is easy to use；
1) since this kind invention is in contact with the position to be measured of battery modules by testing positive electrode and test negative electrode,
And pick-up current, it can achieve the purpose that the conduction of non-destructive testing battery modules junction thus, ensure that the complete of workpiece
Property；
2) by comparing the difference of variation degree (i.e. the slope) and standard value of workpiece resistance value under different electric currents, judge to connect
Whether the conduction for meeting place is good, greatly eliminates influence of the other factors such as workpiece temperature to measurement data；
3) infer that battery module connects the formedness of conduction with accurate data analysis, make test result more added with saying
Take power；
The invention, using electric current as abscissa, resistance is that ordinate makees linear graph, by the slope and mark of obtained linear graph
Quasi- slope value compares, and in certain slope range, that is, it is good to be considered as conduction.Battery pack is detected using the method to connect
The conduction connect has achieved the purpose that non-destructive testing, while (i.e. by comparing the variation degree of workpiece resistance value under different electric currents
Slope) with the difference of standard value, judge whether conduction good, greatly eliminate the factors pair such as workpiece temperature, contact resistance
The influence of measurement data.
Description of the drawings
Fig. 1 is the overall structure diagram of invention.
Fig. 2 is the schematic diagram that the present invention makees linear graph using actual measured value.
Fig. 3 is the workpiece sensing schematic diagram after wire ultrasonic bond of the present invention.
Fig. 4 is the workpiece sensing schematic diagram after sheet base material resistance spot welding of the present invention.
Fig. 5 is the cylindric proximate matter of the present invention and the workpiece sensing schematic diagram after plate proximate matter Laser Welding.
In figure：1, positive electrode is tested；2, negative electrode is tested；3, display；4, host computer；5, tester；6, base material；7、
Weld seam；8, wire；9, plate-like type base material；10, cylindrical type base material.
Specific implementation mode
To make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, with reference to
Specific implementation mode, the present invention is further explained.
Embodiment 1：
As shown in Figs. 1-5, the detection device and its detection method of a kind of group of battery modules junction conduction, including test
Instrument 5, host computer 4 and display 3, the output end of the tester 5 are electrically connected with the input terminal of host computer 4, the electricity
The output end of brain server 4 and the input terminal of display 3 are electrically connected, the middle part interlocking of the tester 5 have resistance test table and
Testing current table, the tester 5 by the conducting wire that is screwed on wiring knob respectively with test positive electrode 1 and test negative electrode 2
Be connected, it is described test positive electrode 1 and test negative electrode 2 one end be all connected on base material 6, the two neighboring base material 6 it
Between be provided with weld seam 7, be connected by wire 8 between the weld seam 7, it is described test positive electrode 1 and test negative electrode 2 it is another
One end is connected with group of battery modules, can effectively realize the conduction detection of battery modules thus.
Wherein, the base material 6 includes plate-like type base material 9 and cylindrical type base material 10, and the weld seam 7 is set to cylindrical type base material
10 periphery.
Wherein, there are four the test negative electrode 2 is arranged altogether, and the test negative electrode 2 is set to cylindrical type base material 10
On.
Wherein, there are four the test positive electrode 1 is arranged altogether, and the test positive electrode 1 is set to plate-like type base material 9
Four corners.
Wherein, the electric current being passed through between the test positive electrode 1 and test negative electrode 2 is I1=2A, I2=3A, I3=
4A。
A kind of detection method of group of battery modules junction conduction, including group of battery modules and tester 5 and following step
Suddenly：
1) different size of electric current is connected at the both ends of position to be measured in group of battery modules, and location is waited in group of battery modules
Different size of electric current is connected at the both ends set, and record current value is I1, I2, I3；
2) resistance for testing position to be measured under different electric currents, the both ends of position to be measured are connected different big in group of battery modules
After small electric current, the resistance under current flow is recorded, and it is R1, R2, R3, group of battery modules junction resistance value to record resistance value
Measurement can be measured using tester 5；
3) make linear map analysis to compare.
Wherein, make linear map analysis in the step 3) to be compared as follows：
A, using current value as abscissa, resistance value is that ordinate makees linear graph, and figure can be by host computer 4 and aobvious
Show in device 3 and show, and calculates its slope；
B, the calibration slope value of the calculated slope sample excellent with conduction is made comparisons, in scheduled slope range,
It is considered as that conduction is good, the conduction for being otherwise considered as position to be measured is poor.
Wherein, the formula that the host computer 4 is used to calculate slope is k=I/R, and wherein k is slope, and I is electric current, and R is
Resistance, and the host computer 4 can also carry out the calculating and storage of slope value.
Wherein, the display 3 is used for the display of linear graph.
It should be noted that the present invention is detection device and its detection side of a kind of group of battery modules junction conduction
Method when work, first fixes group of battery modules, in group of battery modules access test 1 He of positive electrode in position both ends to be detected
Negative electrode 2 is tested, is respectively turned on three kinds of different size of electric currents, then I1=2A, I2=3A, I3=4A are surveyed using tester 5
Resistance R1, R2, the R3 under the difference electric current of both ends are tried, and the data tested can store in host computer 4, and in host computer 4
Under the program cooperation of middle implantation, finally using electric current as abscissa, resistance is ordinate, and linear graph is made in display 3, is calculated
The slope of calculating is compared with calibration slope, if in certain slope range, is considered as and leads by the slope of its linear line
The general character is good, if the slope of measuring and calculation differs greatly with calibration slope, we it is believed that the position conducting
Property is bad.
Embodiment 2：
As shown in Figs. 1-5, the detection device and its detection method of a kind of group of battery modules junction conduction, including test
Instrument 5, host computer 4 and display 3, the output end of the tester 5 are electrically connected with the input terminal of host computer 4, the electricity
The output end of brain server 4 and the input terminal of display 3 are electrically connected, the middle part interlocking of the tester 5 have resistance test table and
Testing current table, the tester 5 by the conducting wire that is screwed on wiring knob respectively with test positive electrode 1 and test negative electrode 2
Be connected, it is described test positive electrode 1 and test negative electrode 2 one end be all connected on base material 6, the two neighboring base material 6 it
Between be provided with weld seam 7, be connected by wire 8 between the weld seam 7, it is described test positive electrode 1 and test negative electrode 2 it is another
One end is connected with group of battery modules, can effectively realize the conduction detection of battery modules thus.
Wherein, the base material 6 includes plate-like type base material 9 and cylindrical type base material 10, and the weld seam 7 is set to cylindrical type base material
10 periphery.
Wherein, there are four the test negative electrode 2 is arranged altogether, and the test negative electrode 2 is set to cylindrical type base material 10
On.
Wherein, there are four the test positive electrode 1 is arranged altogether, and the test positive electrode 1 is set to plate-like type base material 9
Four corners.
Wherein, the electric current being passed through between the test positive electrode 1 and test negative electrode 2 is I1=2A, I2=4A, I3=
6A, I4=8A.
A kind of detection method of group of battery modules junction conduction, including group of battery modules and tester 5 and following step
Suddenly：
1) different size of electric current is connected at the both ends of position to be measured in group of battery modules, and location is waited in group of battery modules
Different size of electric current is connected at the both ends set, and record current value is I1, I2, I3, I4；
2) resistance for testing position to be measured under different electric currents, the both ends of position to be measured are connected different big in group of battery modules
After small electric current, the resistance under current flow is recorded, and it is R1, R2, R3, R4, group of battery modules junction electricity to record resistance value
The measurement of resistance value can be measured using tester 5；
3) make linear map analysis to compare.
Wherein, make linear map analysis in the step 3) to be compared as follows：
A, using current value as abscissa, resistance value is that ordinate makees linear graph, and figure can be by host computer 4 and aobvious
Show in device 3 and show, and calculates its slope；
B, the calibration slope value of the calculated slope sample excellent with conduction is made comparisons, in scheduled slope range,
It is considered as that conduction is good, the conduction for being otherwise considered as position to be measured is poor.
Wherein, the formula that the host computer 4 is used to calculate slope is k=I/R, and wherein k is slope, and I is electric current, and R is
Resistance, and the host computer 4 can also carry out the calculating and storage of slope value.
Wherein, the display 3 is used for the display of linear graph.
It should be noted that the present invention is detection device and its detection side of a kind of group of battery modules junction conduction
Method when work, first fixes group of battery modules, in group of battery modules access test 1 He of positive electrode in position both ends to be detected
Negative electrode 2 is tested, four kinds of different size of electric currents, I1=2A, I2=4A, I3=6A, I4=8A, then using survey are respectively turned on
Resistance R1, R2, R3, R4 that instrument 5 is tested under the difference electric current of both ends are tried, and the data tested can store in host computer 4, and
Under the program cooperation being implanted into host computer 4, finally using electric current as abscissa, resistance is ordinate, makees outlet in display 3
Property figure, calculates the slope of its linear line, the slope of calculating is compared with calibration slope, if in certain slope range
It is interior, then be considered as that conduction is good, if the slope of measuring and calculation differs greatly with calibration slope, we it is believed that
The conduction of the position is bad.
Embodiment 3：
As shown in Figs. 1-5, the detection device and its detection method of a kind of group of battery modules junction conduction, including test
Instrument 5, host computer 4 and display 3, the output end of the tester 5 are electrically connected with the input terminal of host computer 4, the electricity
The output end of brain server 4 and the input terminal of display 3 are electrically connected, the middle part interlocking of the tester 5 have resistance test table and
Testing current table, the tester 5 by the conducting wire that is screwed on wiring knob respectively with test positive electrode 1 and test negative electrode 2
Be connected, it is described test positive electrode 1 and test negative electrode 2 one end be all connected on base material 6, the two neighboring base material 6 it
Between be provided with weld seam 7, be connected by wire 8 between the weld seam 7, it is described test positive electrode 1 and test negative electrode 2 it is another
One end is connected with group of battery modules, can effectively realize the conduction detection of battery modules thus.
Wherein, the base material 6 includes plate-like type base material 9 and cylindrical type base material 10, and the weld seam 7 is set to cylindrical type base material
10 periphery.
Wherein, there are four the test negative electrode 2 is arranged altogether, and the test negative electrode 2 is set to cylindrical type base material 10
On.
Wherein, there are four the test positive electrode 1 is arranged altogether, and the test positive electrode 1 is set to plate-like type base material 9
Four corners.
Wherein, the electric current being passed through between the test positive electrode 1 and test negative electrode 2 is I1=5A, I2=10A, I3=
20A, I4=30A.
A kind of detection method of group of battery modules junction conduction, including group of battery modules and tester 5 and following step
Suddenly：
1) different size of electric current is connected at the both ends of position to be measured in group of battery modules, and location is waited in group of battery modules
Different size of electric current is connected at the both ends set, and record current value is I1, I2, I3, I4；
2) resistance for testing position to be measured under different electric currents, the both ends of position to be measured are connected different big in group of battery modules
After small electric current, the resistance under current flow is recorded, and it is R1, R2, R3, R4, group of battery modules junction electricity to record resistance value
The measurement of resistance value can be measured using tester 5；
3) make linear map analysis to compare.
Wherein, make linear map analysis in the step 3) to be compared as follows：
A, using current value as abscissa, resistance value is that ordinate makees linear graph, and figure can be by host computer 4 and aobvious
Show in device 3 and show, and calculates its slope；
B, the calibration slope value of the calculated slope sample excellent with conduction is made comparisons, in scheduled slope range,
It is considered as that conduction is good, the conduction for being otherwise considered as position to be measured is poor.
Wherein, the formula that the host computer 4 is used to calculate slope is k=I/R, and wherein k is slope, and I is electric current, and R is
Resistance, and the host computer 4 can also carry out the calculating and storage of slope value.
Wherein, the display 3 is used for the display of linear graph.
It should be noted that the present invention is detection device and its detection side of a kind of group of battery modules junction conduction
Method when work, first fixes group of battery modules, in group of battery modules access test 1 He of positive electrode in position both ends to be detected
Negative electrode 2 is tested, is respectively turned on four kinds of different size of electric currents, then I1=5A, I2=10A, I3=20A, I4=30A make
Resistance R1, R2, R3, the R4 under the difference electric current of both ends are tested with tester 5, and the data tested can store in host computer 4,
And under the program cooperation being implanted into host computer 4, finally using electric current as abscissa, resistance is ordinate, is made in display 3
Cutting edge aligned figure calculates the slope of its linear line, and the slope of calculating is compared with calibration slope, if in certain slope model
In enclosing, then it is considered as that conduction is good, if the slope of measuring and calculation differs greatly with calibration slope, we have reason phase
Letter, the conduction of the position are bad.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (9)
1. a kind of detection device of group of battery modules junction conduction, including tester (5), host computer (4) and display
(3), it is characterised in that：The output end of the tester (5) is electrically connected with the input terminal of host computer (4), the computer master
The output end of machine (4) is electrically connected with the input terminal of display (3), and the middle part interlocking of the tester (5) has resistance test table
With testing current table, the tester (5) is born with test positive electrode (1) and test respectively by the conducting wire being screwed on wiring knob
Electrode (2) is connected, and one end of the test positive electrode (1) and test negative electrode (2) is all connected on base material (6), and adjacent two
It is provided with weld seam (7) between a base material (6), is connected by wire (8) between the weld seam (7), the test is just
The other end of electrode (1) and test negative electrode (2) is connected with group of battery modules.
2. a kind of detection device of group of battery modules junction conduction according to claim 1, it is characterised in that：It is described
Base material (6) includes plate-like type base material (9) and cylindrical type base material (10), and the weld seam (7) is set to the outer of cylindrical type base material (10)
Week.
3. a kind of detection device of group of battery modules junction conduction according to claim 1 or 2, it is characterised in that：
There are four the test negative electrode (2) is arranged altogether, and the test negative electrode (2) is set on cylindrical type base material (10).
4. according to a kind of detection device of any group of battery modules junction conduction of claims 1 or 2, feature exists
In：There are four the test positive electrode (1) is arranged altogether, and the test positive electrode (1) is set to four of plate-like type base material (9)
Corner.
5. a kind of detection device of group of battery modules junction conduction according to claim 1, it is characterised in that：It is described
The electric current being passed through between test positive electrode (1) and test negative electrode (2) is not less than 1A.
6. a kind of detection method of the detection device of junction of group of battery modules according to claim 1 conduction, feature
It is, including group of battery modules and tester (5) and following steps：
1) different size of electric current is connected at the both ends of position to be measured in group of battery modules, the position to be measured in group of battery modules
Different size of electric current is connected at both ends, and record current value is I1, I2, I3, I4；
2) resistance for testing position to be measured under different electric currents, the both ends of position to be measured are connected different size of in group of battery modules
After electric current, the resistance under current flow is recorded, and it is R1, R2, R3, R4, group of battery modules junction resistance value to record resistance value
Measurement can be measured using tester (5)；
3) make linear map analysis to compare.
7. a kind of detection method of group of battery modules junction conduction according to claim 6, which is characterized in that described
Make linear map analysis in step 3) to be compared as follows：
A, using current value as abscissa, resistance value is that ordinate makees linear graph, and figure by host computer (4) and can shown
Display in device (3), and calculate its slope；
B, the calibration slope value of the calculated slope sample excellent with conduction is made comparisons, and in scheduled slope range, that is, is regarded
Good for conduction, the conduction for being otherwise considered as position to be measured is poor.
8. a kind of detection device of group of battery modules junction conduction according to claim 1, it is characterised in that：It is described
The formula that host computer (4) is used to calculate slope is k=I/R, and wherein k is slope, and I is electric current, and R is resistance, and the computer
Host (4) can also carry out the calculating and storage of slope value.
9. a kind of detection device of group of battery modules junction conduction according to claim 1, it is characterised in that：It is described
Display (3) is used for the display of linear graph.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810383064.2A CN108535660A (en) | 2018-04-26 | 2018-04-26 | The detection device and its detection method of a kind of group of battery modules junction conduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810383064.2A CN108535660A (en) | 2018-04-26 | 2018-04-26 | The detection device and its detection method of a kind of group of battery modules junction conduction |
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