CN108279386A - A kind of battery core screening technique - Google Patents
A kind of battery core screening technique Download PDFInfo
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- CN108279386A CN108279386A CN201810112428.3A CN201810112428A CN108279386A CN 108279386 A CN108279386 A CN 108279386A CN 201810112428 A CN201810112428 A CN 201810112428A CN 108279386 A CN108279386 A CN 108279386A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/18—Subjecting similar articles in turn to test, e.g. go/no-go tests in mass production
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
The present invention provides a kind of battery core screening technique, which includes：By pressure resistant testing device in battery core anode ear and negative electrode lug be electrically connected；Apply the setting voltage of setting time length to battery core using pressure resistant testing device according to the parameter of battery core, and the current value of battery core is detected；According to the current value of battery core, battery core is screened.Technical solution proposed by the present invention, it is set in advance all in accordance with the parameter of battery core to applying alive voltage value and applying the alive time, can more accurately in judge the actual state of battery core, improve the accuracy of battery core screening, it solves in the prior art, battery core is screened using conventional data, there is no specific aim, because often occur erroneous judgement caused by security risk and increase production cost the problems such as, realize False Rate during reducing battery core voltage-withstand test, improve subsequent handling safety, it is cost-effective the purpose of.
Description
Technical field
The present embodiments relate to battery screening technique more particularly to a kind of battery core screening techniques.
Background technology
The high speed development of electronic product keeps people's life more and more convenient, battery as electronic product hardcore it
One, performance is also increasingly by the attention of business and consumer and concern.
In the manufacturing process of battery, battery core can be carried out voltage-withstand test by being formed after battery core, but many companies' works at present
Skill test data is substantially general, and measuring mechanism and data verification are not furtherd investigate.For different model or material etc.
The battery core of parameter, the case where often will appear erroneous judgement using general test data, i.e., the battery core of poor short circuit cannot arrange in time
It removes, bad battery core will continue to subsequent handling, and there are security risks for bad battery core, can reduce the safety during subsequent handling
Property, and continue subsequent handling and will increase production cost.
Invention content
The present invention provides a kind of battery core screening technique, to realize False Rate during reduction battery core voltage-withstand test, after raising
The safety of continuous process, cost-effective purpose.
The embodiment of the present invention proposes a kind of battery core screening technique, including：
By pressure resistant testing device in battery core anode ear and negative electrode lug be electrically connected；
According to the parameter of the battery core, using the pressure resistant testing device, apply setting time length to the battery core
Voltage is set, and the current value of the battery core is detected；
According to the current value of the battery core, the battery core is screened.
Optionally, the setting time length is 0.5~1.0s.
Optionally, the voltage that sets is 250~750V.
Optionally, the current value according to the battery core, screens the battery core, including：
According to the current value of the battery core, the resistance value of the battery core is calculated；
According to the resistance value of the battery core, the battery core is screened.
Optionally, the resistance value according to the battery core, screens the battery core, including：
According to the magnitude relationship of the resistance value of the battery core and predetermined threshold value, the battery core is screened.
Optionally, described according to the resistance value of the battery core and the magnitude relationship of predetermined threshold value, the battery core is sieved
Choosing, including：
If the resistance value of the battery core is less than the predetermined threshold value, the battery core is rejected.
Optionally, the predetermined threshold value is 180~360M Ω.
Optionally, the setting time length is 0.7s, and for the voltage that sets as 500V, the predetermined threshold value is 360M
Ω。
Optionally, the parameter of the battery core includes the model and/or material of battery core.
The embodiment of the present invention proposes a kind of battery core screening technique, by by the anode ear in pressure resistant testing device and battery core
It is electrically connected with negative electrode lug；According to the parameter of the battery core, using pressure resistant testing device, apply setting for setting time length to battery core
Constant voltage, and the current value of battery core is detected；According to the current value of battery core, battery core is screened.By to applying electricity
The voltage value of pressure and apply the alive time and be set in advance all in accordance with the parameter of battery core, can more accurately in judge
Go out the actual state of battery core, improves the accuracy of battery core screening.It solves in the prior art, battery core is carried out using conventional data
Screening, without specific aim, because often there is erroneous judgement caused by security risk and the problems such as increase production cost, realize and subtract
False Rate during small battery core voltage-withstand test, improves the safety of subsequent handling, it is cost-effective the purpose of.
Description of the drawings
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limitation of the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Fig. 1 is a kind of flow chart for battery core screening technique that the embodiment of the present invention one provides；
Fig. 2 is the relational graph of the current value and time for a kind of battery core that the embodiment of the present invention one provides；
Fig. 3 is a kind of flow chart of battery screening technique provided by Embodiment 2 of the present invention；
The relational graph of the virtual voltage of battery core and testing time when Fig. 4 is different test voltages；
The relational graph of the actual resistance of battery core and testing time when Fig. 5 is different test voltages；
Fig. 6-Fig. 8 is the actual resistance of different battery cores and the relational graph of testing time；
Fig. 9-Figure 12 is a fraction defective of different battery cores or secondary fraction defective.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limitation of the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Battery core is by positive (conductive material), cathode (conductive material) and diaphragm (insulating materials) winding composition, wherein
Diaphragm among positive and negative anodes is for preventing positive and negative anodes contact from short circuit occurs.
Risk due to there is short dot in battery core sometimes or with the presence of battery core short circuit/micro-short circuit is caused, such as particle,
Metal fillings, dendrite etc. can pierce through diaphragm or diaphragm material uneven thickness and battery core caused to be ruptured in rear process formation charging septation
And situations such as short circuit of generation, it is therefore desirable to voltage-withstand test be carried out to battery core, and battery core is sieved according to voltage-withstand test result
Choosing.
Embodiment one
Fig. 1 is a kind of flow chart for battery core screening technique that the embodiment of the present invention one provides.Referring to Fig. 1, the present invention is implemented
The battery core screening technique that example one proposes, including：
S110：By pressure resistant testing device in battery core anode ear and negative electrode lug be electrically connected.
After the completion of electric core winding scalds hole, battery core can be transported to transportation line, and transportation line drives battery core movement, works as shifting
After moving certain position, battery core is positioned by battery core positioning device.After battery core positioning, by pressure resistant testing device and battery core
In anode ear and negative electrode lug electrical connection.
Illustratively, pressure resistant testing device includes positive conductive stick and negative conductive stick.By positive conductive stick and battery core
Anode ear is electrically connected, and negative conductive stick is electrically connected with the negative electrode lug of battery core.
S120：Apply the setting electricity of setting time length to battery core using pressure resistant testing device according to the parameter of battery core
Pressure, and the current value of battery core is detected.
S130：According to the current value of battery core, battery core is screened.The electric current of the battery core of pressure resistant testing device test can be with
Including capacitance current i1, absorb electric current i2And/or leakage current i3.Wherein, capacitance current i1Also known as displacement current, capacitance current i1
The electric current to be formed is moved different from charge, is the equivalent current caused by capacitor charge and discharge.Absorb electric current i2Also known as polarization electricity
Stream, the electric current formed due to molecular polarization and electronics drift, it declines with the alive time is applied from relatively higher original value
It reduces to close to zero, size depends on the type and situation of adhesives used in insulation system.Leakage Current i3It is dielectric
In have only a few constraint very weak or free ion, at a dc voltage, negative ions are respectively to two-stage is mobile and is formed.
Therefore, to the voltage value being applied in battery core and alive time span can be applied according to the parameter of battery core
Etc. parameters set, wherein setting time length is that pressure resistant testing device is applied to current value in battery core or voltage value
Time.By applying setting voltage and setting time length to battery core, test data inaccuracy can be avoided the occurrence of and generated
Erroneous judgement, phenomena such as failing to judge, improve the accuracy of battery core voltage-withstand test, so as to according to test result can accurately to battery core into
Row screening, after avoiding unqualified battery core from flowing into caused by process and client manufacturing cost increase, security risk and reputational risk.
Battery core screening technique provided in an embodiment of the present invention, by by pressure resistant testing device and battery core anode ear and bear
Lug is electrically connected；Apply the setting voltage of setting time length to battery core using pressure resistant testing device according to the parameter of battery core,
And the current value of battery core is detected；According to the current value of battery core, battery core is screened.By to applying alive voltage
Be worth and apply the alive time and be set in advance all in accordance with the parameter of battery core, can more accurately in judge battery core
Actual state improves the accuracy of battery core screening.It solves in the prior art, battery core is screened using conventional data, is not had
Targetedly, because often occur erroneous judgement caused by security risk and increase production cost the problems such as, realize reduction battery core
False Rate during voltage-withstand test, improves the safety of subsequent handling, it is cost-effective the purpose of.
Fig. 2 is the relational graph of the current value and time for a kind of battery core that the embodiment of the present invention one provides.Referring to Fig. 2, capacitance
Electric current i1, absorb electric current i2With leakage current i3Three electric current stabilization times are inconsistent.This explanation, applies the battery core of different parameters
Alive time span is identical, may result in phenomena such as being judged by accident or being failed to judge to battery core.Therefore in actual test process
In, it needs according to parameter to be measured, alive time span is applied to battery core and is rationally corrected, to reduce the possibility of erroneous judgement
Property.
Similarly, the size for the voltage value being applied in battery core can also have an impact the test result of battery core.In practical survey
During examination, need, according to the voltage value being applied in battery core, to apply alive time span to battery core and rationally corrected, with
Reduce the possibility of erroneous judgement.
Optionally, the parameter of battery core includes the model and/or material of battery core.It is understood that the parameter of battery core removes it
Can also include the parameters such as battery core resistance, battery core energy density per unit volume and discharge-rate outside model and material.
Optionally, S130 includes：According to the current value of battery core, the resistance value of battery core is calculated；It is right according to the resistance value of battery core
Battery core is screened.The reason of being arranged in this way is when there is short circuit or micro-short circuit in battery core, to make the electric current measured
Value is smaller, is not easy the smaller current value of logarithm and is divided.In order to keep test result more obvious, it is convenient to test result into
Row judgement can calculate the resistance value of battery core according to the current value of battery core by R=U/I, further according to battery core resistance value to electricity
Core is screened.
Optionally, pressure resistant testing device is 19073 pressure testers, and the error occurred and increase are calculated to avoid artificial
The consumption of human resources.
Further, according to the resistance value of battery core, battery core is screened, may include：According to the resistance value of battery core with
The magnitude relationship of predetermined threshold value, screens battery core.
Different predetermined threshold values is arranged in the battery core that different parameters can be directed to, and predetermined threshold value is to screen the judgement mark of battery core
Standard can be the battery core of corresponding types after the setting voltage for applying setting time length, it is contemplated that acceptable lowest resistance value.
Illustratively, according to the magnitude relationship of the resistance value of battery core and predetermined threshold value, battery core is screened, including：If
The resistance value of battery core is less than predetermined threshold value, and battery core is rejected.
When the resistance value of the battery core measured is less than predetermined threshold value, illustrate that there may be the feelings such as short circuit or micro-short circuit in battery core
Condition judges the unqualified battery core of battery core, is rejected；When the resistance value of the battery core measured is greater than or equal to predetermined threshold value, say
Insulation performance in bright battery core is preferable, situations such as short circuit or micro-short circuit does not occur, judges that battery core for qualified battery core, continues to
Referring to subsequent technique.
Embodiment two
The present embodiment is a specific example in embodiment one.Fig. 3 is a kind of battery provided by Embodiment 2 of the present invention
The flow chart of screening technique.Referring to Fig. 3, the battery core screening technique, including：
S210：By pressure resistant testing device in battery core anode ear and negative electrode lug be electrically connected.
S220：Apply the setting electricity of setting time length to battery core using pressure resistant testing device according to the parameter of battery core
Pressure, and the current value of battery core is detected.
Illustratively, according to test of many times as a result, in order to ensure that battery core test is complete, and application time length is avoided to spend
Testing efficiency reduces caused by length, and it is 0.5~1.0s that setting time length, which can be arranged,.The specific of setting time length is set
It sets, has great role to up- coiler speed-raising, raising production capacity, be conducive to the further excellent of the corresponding part in industrial processes
Change.
Setting voltage can also be set according to the parameter of battery core, and optionally, setting voltage can be 250~750V.
S230：According to the current value of battery core, the resistance value of battery core is calculated.
S240：According to the magnitude relationship of the resistance value of battery core and predetermined threshold value, battery core is screened.
Optionally, to ensure battery core high voltage performance, prevent battery core there are short-circuit risks, predetermined threshold value, which can be arranged, is
180~360M Ω.
Battery core screening technique provided in an embodiment of the present invention, when by applying alive voltage value and apply alive
Between be set in advance all in accordance with the parameter of battery core, can more accurately in judge the actual state of battery core, improve battery core
The accuracy of screening.It solves in the prior art, battery core is screened using conventional data, without specific aim, because often going out
Security risk and the problems such as increase production cost caused by now judging by accident, realizes and is judged by accident during reducing battery core voltage-withstand test
Rate, improves the safety of subsequent handling, it is cost-effective the purpose of.
Illustratively, long to setting time in the present embodiment below by taking the cylindrical coil core battery core of model 18650 as an example
The determination method of degree, setting voltage and predetermined threshold value illustrates.
The setting voltage for continuously applying 1.0s to the battery core of different parameters by pressure resistant testing device, to the practical electricity of battery core
Pressure value is studied with the situation of change of testing time.All battery cores in test process can be first set before carrying out experimental study
Test resistance be fixed as 180M Ω, the test voltage being applied in battery core is respectively 250V, 500V, 750V.Respectively to battery core
When applying different test voltages, the virtual voltage of battery core when each battery core applies the different testing times is tested, wherein the testing time
Time interval is 0.1s.
The relational graph of the virtual voltage of battery core and testing time when Fig. 4 is different test voltages.As can be seen from FIG. 4, different
When test voltage, the virtual voltage of battery core tends towards stability after applying test voltage 0.3s, and stablizes continue corresponding always
Test voltage terminates up to the testing time.
In view of equipment conveyer belt run time, voltage and resistance rise time, will can uniformly be set to the testing time
1.0s。
The relational graph of the actual resistance of battery core and testing time when Fig. 5 is different test voltages.As can be seen from FIG. 5, it tests
When voltage is set as 250V, 500V and 750V, equipment is just to start really to test after starting to test 0.4s.Testing time is
The actual resistance of battery core starts to change when 0.5~1.0s, can be screened, i.e., in battery core screening process, setting time
Can be 0.5~1.0s the time required to length, i.e. pressure resistant testing device test battery core resistance.
With continued reference to Fig. 5, when test voltage is set as 250V, the actual resistance of battery core increases to maximum value in 0.6s；Test
When voltage is set as 500V, the actual resistance of battery core increases to maximum value in 0.7s；When test voltage is set as 750V, the reality of battery core
Resistance increases to maximum value in 0.5s.Testing time when the actual resistance of battery core increases to maximum value can be setting time
Length.When test voltage difference, required setting time length is different, to ensure that battery core test is complete, setting time length
It can be set as 0.7s.
Fig. 6-Fig. 8 is the actual resistance of different battery cores and the relational graph of testing time.Fig. 6 is that test voltage is 750V, is surveyed
When examination resistance is 180M Ω, the actual resistance of battery core and the relational graph of testing time.Fig. 7 is that test voltage is 500V, test electricity
When resistance is 180M Ω, the actual resistance of battery core and the relational graph of testing time.Fig. 8 is that test voltage is 250V, and test resistance is
When 180M Ω, the actual resistance of battery core and the relational graph of testing time.Referring to Fig. 6-Fig. 8, it can be seen that different battery cores are in difference
The box traction substation of the actual resistance of the battery core obtained under testing time, wherein each data point is by repeatedly surveying in Fig. 6-Fig. 8
Examination show that the data in that is, each data point have certain fluctuation range.According to Fig. 6-Fig. 8 it is found that respectively to different electricity
Core is repeatedly tested, and test result is relatively stable when the testing time is 0.7s, therefore setting time length can be set as
0.7s。
It should be noted that if when setting time length is determined as 0.3s, 0.4s, the resistance value of surveyed battery core is not tested
Completely, when being less than predetermined threshold value, pressure resistant testing device is judged to NG, i.e. discriminating test battery core is unqualified battery core, voltage-withstand test dress
It sets and is continuously judged to NG three times, then up- coiler is alarmed, and stops production.
Table 1 is a fraction defective of the battery core of different parameters and secondary fraction defective.
| Scheme | Parameter | Put into number (pcs) | Fraction defective (ppm) | Secondary fraction defective (%) |
| 1 | 250V、180MΩ、1.0s | 192403 | 212 | 10 |
| 2 | 250V、250MΩ、1.0s | 93379 | 246 | 35 |
| 3 | 250V、360MΩ、1.0s | 98760 | 182 | 42 |
| 4 | 500V、180MΩ、1.0s | 66388 | 422 | 61 |
| 5 | 500V、250MΩ、1.0s | 45306 | 574 | 100 |
| 6 | 500V、360MΩ、1.0s | 104838 | 353 | 100 |
| 7 | 750V、180MΩ、1.0s | 117626 | 731 | 96 |
| 8 | 750V、250MΩ、1.0s | 115886 | 984 | 92 |
| 9 | 750V、360MΩ、1.0s | 78044 | 602 | 93 |
The ratios of bad core repetition measurement NG battery cores again is discharged it should be noted that secondary fraction defective is primary test, shows
Example property, during one-time detection, the i.e. primary bad battery core of the underproof battery core of one-time detection is 10, the underproof electricity of repetition measurement
Core is 5, then it is assumed that the secondary fraction defective in this detection is 50%.I.e. secondary fraction defective can be regarded as a False Rate.
Fig. 9-Figure 12 is a fraction defective of different battery cores or secondary fraction defective.Fig. 9-Figure 12 is obtained according to table 1, figure
9 be a fraction defective of the battery core of the different parameters measured.Figure 10 is the secondary fraction defective of the battery core of the different parameters measured.Figure
Fraction defective of 11 battery cores when being different test voltages.The secondary fraction defective of battery core when Figure 12 is different test voltages.Referring to
Table 1 and Fig. 9-Figure 12, it is known that, according to the data of obtained a fraction defective and secondary fraction defective, when test voltage is 500V, row
Go out that bad battery core False Rate is minimum, and secondary bad rate is higher.To ensure battery core high voltage performance, prevent battery core from there is short-circuit wind
Predetermined threshold value, can be set as 360M Ω by danger.
Illustratively, pressure resistant testing device makes battery core positive and negative anodes ear point discharge, continuous 1.0s apply 500V's to battery core
Voltage measures the current value of battery core, its resistance value is calculated by current value, if obtained resistance value is higher than 360M Ω, such as 2608M
Ω then judges that the battery core insulation performance meets sets requirement for spec battery, is judged to pass, can continue on transportation line
It walks downward, carries out subsequent technique；If obtained resistance value then judges that the battery core insulation performance is not inconsistent less than 360M Ω such as 10M Ω
Conjunction sets requirement is unqualified battery core, is judged to NG, when it is unqualified battery to determine battery core, can send a signal to battery core measuring staff
Fixed part releases bad battery core.
The battery core screening technique provided according to above-described embodiment carries out it voltage-withstand test, and according to its test result to it
It is screened.In screening process, optionally, it is 0.7s that setting time length, which can be arranged, sets voltage as 500V, predetermined threshold value
For 360M Ω.
Note that above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiments described here, can carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out to the present invention by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
May include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (9)
1. a kind of battery core screening technique, which is characterized in that including：
By pressure resistant testing device in battery core anode ear and negative electrode lug be electrically connected；
According to the parameter of the battery core, apply the setting electricity of setting time length to the battery core using the pressure resistant testing device
Pressure, and the current value of the battery core is detected；
According to the current value of the battery core, the battery core is screened.
2. battery core screening technique according to claim 1, which is characterized in that the setting time length is 0.5~1.0s.
3. battery core screening technique according to claim 1, which is characterized in that the voltage that sets is 250~750V.
4. battery core screening technique according to claim 1, which is characterized in that the current value according to the battery core, it is right
The battery core is screened, including：
According to the current value of the battery core, the resistance value of the battery core is calculated；
According to the resistance value of the battery core, the battery core is screened.
5. battery core screening technique according to claim 4, which is characterized in that the resistance value according to the battery core is right
The battery core is screened, including：
According to the magnitude relationship of the resistance value of the battery core and predetermined threshold value, the battery core is screened.
6. battery core screening technique according to claim 5, which is characterized in that the resistance value according to the battery core with it is pre-
If the magnitude relationship of threshold value screens the battery core, including：
If the resistance value of the battery core is less than the predetermined threshold value, the battery core is rejected.
7. battery core screening technique according to claim 6, which is characterized in that the predetermined threshold value is 180~360M Ω.
8. battery core screening technique according to claim 6, which is characterized in that the length that sets is 0.7s, the setting
Voltage is 500V, and the predetermined threshold value is 360M Ω.
9. according to any battery core screening techniques of claim 1-8, which is characterized in that the parameter of the battery core includes battery core
Model and/or material.
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| CN109444645A (en) * | 2018-12-21 | 2019-03-08 | 珠海华冠科技股份有限公司 | Battery core short-circuit test device and its test method |
| CN109581232A (en) * | 2018-12-12 | 2019-04-05 | 江苏时代新能源科技有限公司 | A method of determining that can battery core repetition measurement |
| CN111257755A (en) * | 2020-03-31 | 2020-06-09 | 上海玫克生储能科技有限公司 | Method for preventive detection and diagnosis of battery pack |
| CN112731090A (en) * | 2020-12-24 | 2021-04-30 | 江西生益科技有限公司 | Method and device for testing voltage resistance of copper-clad plate on line |
| CN115877210A (en) * | 2022-12-08 | 2023-03-31 | 青岛艾测科技有限公司 | Pressure-maintaining adjustable capacitive load insulation detection method, device and equipment |
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