CN110333459A - A kind of battery screening technique and device, computer readable storage medium - Google Patents

A kind of battery screening technique and device, computer readable storage medium Download PDF

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Publication number
CN110333459A
CN110333459A CN201910606136.XA CN201910606136A CN110333459A CN 110333459 A CN110333459 A CN 110333459A CN 201910606136 A CN201910606136 A CN 201910606136A CN 110333459 A CN110333459 A CN 110333459A
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internal resistance
sample
battery
value
target
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CN110333459B (en
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谢红斌
张加亮
张俊
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
    • 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
    • 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
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The embodiment of the present application discloses a kind of battery screening technique and device, computer readable storage medium, it include: when being melted into target battery to predeterminated voltage using the first predetermined current, measure the first internal resistance value of target battery, predeterminated voltage is less than or equal to the blanking voltage of target battery, blanking voltage attainable ceiling voltage when being melted into for target battery；When reaching preset time period, the second internal resistance value of target battery is measured；According to the first internal resistance value and the second internal resistance value, the internal resistance running parameter of target battery is calculated；When internal resistance running parameter is unsatisfactory for default internal resistance parameter area, target battery is determined as bad battery, default internal resistance parameter area is the standard value range calculated according to the internal resistance value measured when being melted into using sample battery.

Description

A kind of battery screening technique and device, computer readable storage medium
Technical field
This application involves intelligent terminal charging technique field more particularly to a kind of battery screening techniques and device, computer Readable storage medium storing program for executing.
Background technique
In recent years, lithium ion battery due to its high-performance, discharge energy is strong and the service life is long the features such as be widely used in electronics In apparatus field.
The prior art is to pass through comparison by discharging the lithium ion battery after lithium ion battery is melted into The discharge capacity of lithium ion battery and the target capacity value of the lithium ion battery, to filter out the higher lithium ion battery of performance. When screening lithium ion battery in a manner of the discharge capacity for detecting lithium ion battery, lithium ion battery is repeatedly filled, is put Electricity increases the time of lithium ion battery screening, reduces the production efficiency of lithium ion battery.
Summary of the invention
In order to solve the above technical problems, the embodiment of the present application is intended to provide a kind of battery screening technique and device, computer Readable storage medium storing program for executing can reduce the time of lithium ion battery screening, improve the production efficiency of lithium ion battery.
The technical solution of the application is achieved in that
The embodiment of the present application provides a kind of battery screening technique, and battery screening technique includes:
When being melted into target battery to predeterminated voltage using the first predetermined current, the first internal resistance of target battery is measured Value, predeterminated voltage are less than or equal to the blanking voltage of target battery, and blanking voltage is attainable when being melted into for target battery Ceiling voltage；
When reaching preset time period, the second internal resistance value of target battery is measured；
According to the first internal resistance value and the second internal resistance value, the internal resistance running parameter of target battery is calculated；
When internal resistance running parameter is unsatisfactory for default internal resistance parameter area, target battery is determined as bad battery, is preset Internal resistance parameter area is the standard value range calculated according to the internal resistance value measured when being melted into using sample battery.
The embodiment of the present application provides a kind of battery screening plant, and device includes:
Measuring unit, for when being melted into target battery to predeterminated voltage using the first predetermined current, measurement target electricity First internal resistance value in pond, predeterminated voltage are less than or equal to the blanking voltage of target battery, and blanking voltage is target battery chemical conversion When institute attainable ceiling voltage；When reaching preset time period, the second internal resistance value of target battery is measured；
Computing unit, for calculating the internal resistance running parameter of target battery according to the first internal resistance value and the second internal resistance value；
Screening unit, for when internal resistance running parameter is unsatisfactory for default internal resistance parameter area, target battery to be determined as Bad battery, default internal resistance parameter area are when being melted into using sample battery, to be calculated according to the internal resistance value measured Standard value range.
The embodiment of the present application provides a kind of battery screening plant, and device includes:
Memory, processor and communication bus, memory are communicated by communication bus with processor, memory storage The program of the executable battery screening of processor, when the program of battery screening is performed, by processor execution such as above-mentioned One method.
The embodiment of the present application provides a kind of storage medium, is stored thereon with computer program, is applied to battery screening plant, The method such as any of the above-described is realized when the computer program is executed by processor.
The embodiment of the present application provides a kind of battery screening technique and device, computer readable storage medium, battery screening Method includes: to measure the first internal resistance of target battery when being melted into target battery to predeterminated voltage using the first predetermined current Value, predeterminated voltage are less than or equal to the blanking voltage of target battery, and blanking voltage is attainable when being melted into for target battery Ceiling voltage；When reaching preset time period, the second internal resistance value of target battery is measured；According to the first internal resistance value and the second internal resistance Value, calculates the internal resistance running parameter of target battery；When internal resistance running parameter is unsatisfactory for default internal resistance parameter area, by target electricity Pond is determined as bad battery, and default internal resistance parameter area is when being melted into using sample battery, according to the internal resistance value meter measured The standard value range calculated.Using above method implementation, measured when battery screening plant is according to sample Battery formation Default internal resistance parameter area is calculated in internal resistance value, during target battery chemical conversion, when the internal resistance for getting target battery When running parameter, so that it may compare the internal resistance running parameter of the target battery and default internal resistance parameter area, according to this Comparing result is determining and filters out bad battery, so that battery screening plant can filter out not during Battery formation Good battery reduces the time that battery screening plant filters out bad battery, improves the production efficiency of battery.
Detailed description of the invention
Fig. 1 is a kind of battery screening technique flow chart one provided by the embodiments of the present application；
Fig. 2 is a kind of battery screening technique flowchart 2 provided by the embodiments of the present application；
Fig. 3 is a kind of battery screening technique flow chart 3 provided by the embodiments of the present application；
Fig. 4 is a kind of battery screening technique flow chart four provided by the embodiments of the present application；
Fig. 5 is a kind of battery screening technique flow chart five provided by the embodiments of the present application；
Fig. 6 is a kind of battery screening technique flow chart six provided by the embodiments of the present application；
Fig. 7 is a kind of composed structure schematic diagram one of battery screening plant provided by the embodiments of the present application；
Fig. 8 is a kind of composed structure schematic diagram two of battery screening plant provided by the embodiments of the present application.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete Site preparation description.
Embodiment one
The embodiment of the present application provides a kind of battery screening technique, and Fig. 1 is a kind of battery sieve provided by the embodiments of the present application Choosing method flow chart one, as shown in Figure 1, battery screening technique may include:
S101, when being melted into target battery to predeterminated voltage using the first predetermined current, measure the first of target battery Internal resistance value, predeterminated voltage are less than or equal to the blanking voltage of target battery, and blanking voltage can reach when being melted into for target battery The ceiling voltage arrived.
A kind of battery screening technique provided by the embodiments of the present application is suitable for using battery screening plant in Battery formation Under the scene for screening bad battery.
In the embodiment of the present application, after battery injects electrolyte, battery screening plant can be pre- using first If current versus cell is melted into, with activated batteries, battery can be used normally, when target battery is melted into predeterminated voltage When, battery screening plant begins to the first internal resistance value of measurement target battery.
It should be noted that constant charge current when the first predetermined current can be melted into for target battery, first is default The current value of electric current can be the current value no more than target battery capability value size, and specific first predetermined current can be according to reality Border situation determines that the embodiment of the present application does not limit this.
It should be noted that blanking voltage when predeterminated voltage can be melted into for target battery, can also be target battery It is not melted into the voltage value of any moment to blanking voltage；When first internal resistance value is that target battery is melted into predeterminated voltage, electricity The internal resistance value for the target battery that pond screening plant measures.
Illustratively, the capacity of target battery can be indicated with C, and the value of C can be 1Ah, when battery screening plant utilizes When the constant current of 0.2C is melted into target battery, then the current value of the constant current is 0.2A, i.e. battery screening plant utilizes The constant current of 0.2A is melted into target battery.
Illustratively, the blanking voltage of target battery can be 10V, when battery screening plant is with the constant current pair of 0.2A When target battery is melted into, predeterminated voltage can be blanking voltage 10V, can also be melted into for target battery to blanking voltage Voltage value, such as 8V, if predeterminated voltage be blanking voltage, when battery screening plant charges to target battery to target battery When voltage is 10V, battery screening plant starts the first internal resistance of measurement measurement target battery；If predeterminated voltage is target battery At to the voltage before blanking voltage, such as 8V, then the voltage that battery screening plant charges to target battery to target battery is 8V When, battery screening plant starts the first internal resistance of measurement measurement target battery.
S102, when reaching preset time period, measure the second internal resistance value of target battery.
Battery screening plant is internally provided with preset time period, when the first internal resistance of battery screening plant measurement target battery After value, preset time period is waited, and when reaching preset time period, measures the second internal resistance value of target battery.
It in the embodiment of the present application, not only include mesh in the internal resistance value that measures when target battery is melted into predeterminated voltage Mark battery true internal resistance value, further include the floating pressure internal resistance value of target battery, after preset time period, target battery it is interior Resistance will settle out, and the floating pressure internal resistance value in the internal resistance of the target battery measured at this time is very small, can be neglected.In reality In, it is 1-2 hour that target battery, which is reduced to the time of floating pressure internal resistance, and settable preset time period is 1 hour, can also Think 2 hours, the embodiment of the present application does not do specific restriction to this.
In the embodiment of the present application, the second internal resistance value is battery screening plant when reaching preset time period, the mesh measured Mark the internal resistance value of battery.
S103, according to the first internal resistance value and the second internal resistance value, calculate the internal resistance running parameter of target battery.
When battery screening plant measurement target battery the second internal resistance value after, battery screening plant can according to this second Internal resistance value and the first internal resistance value calculate the internal resistance running parameter of target battery.
In the embodiment of the present application, internal resistance running parameter specifically includes: target internal resistance changing value and target internal resistance change rate. Wherein, target internal resistance changing value is the difference of the second internal resistance and the first internal resistance；Target internal resistance change rate can pass through resistive in target Change value is obtained divided by the first internal resistance.
Illustratively, the first internal resistance value of the target battery that battery screening plant measures is 10 ohm, and the second internal resistance value is 9 Ohm, then target internal resistance changing value is the difference of the second internal resistance and the second internal resistance, is 1 ohm, i.e., target internal resistance changing value is 1 Europe Nurse, target internal resistance change rate can be obtained by target internal resistance changing value divided by the first internal resistance, then target internal resistance change rate is 0.1.
Specifically, Fig. 2 is a kind of battery screening technique flowchart 2 provided by the embodiments of the present application, as shown in Fig. 2, S103 can specifically include S1031-S1033.It is as follows:
S1031, using the second internal resistance value and the first internal resistance value, obtain target internal resistance changing value.
In the embodiment of the present application, when battery screening plant obtains the first internal resistance value and the second internal resistance value, so that it may root According to the first internal resistance value and the second internal resistance value, target internal resistance changing value is obtained.
It should be noted that target internal resistance changing value can difference between the second internal resistance value and the first internal resistance value, Can ratio between the second internal resistance value and the first internal resistance value, can also be calculated to pass through the first internal resistance value and the second internal resistance value The calculation of the value of other forms out, specific target internal resistance changing value can determine according to the actual situation, the application Embodiment does not limit this.
Illustratively, the first internal resistance value that battery screening plant obtains is 10 ohm, and the second internal resistance value is 9 ohm, then mesh Difference of the internal resistance changing value between the second internal resistance and the first internal resistance is marked, is 1 ohm.
S1032, using target internal resistance changing value and the first internal resistance value, obtain target internal resistance change rate.
After battery screening plant obtains target internal resistance changing value, so that it may using in target internal resistance changing value and first Resistance value obtains target internal resistance change rate.
It should be noted that target internal resistance change rate is the ratio of target internal resistance changing value and the first internal resistance value.
Illustratively, the target internal resistance changing value that battery screening plant obtains is 1 ohm, and the first internal resistance value is 10 ohm, Then target internal resistance change rate is the ratio of target internal resistance changing value and the first internal resistance value, is 0.1.
S1033, target internal resistance changing value and target internal resistance change rate are determined as internal resistance running parameter.
After battery screening plant obtains target internal resistance change rate, the target internal resistance changing value and mesh that just will acquire Mark internal resistance change rate is determined as internal resistance running parameter.
S104, when judging that internal resistance running parameter is unsatisfactory for default internal resistance parameter area, target battery is determined as not Good battery；Default internal resistance parameter area is the mark calculated according to the internal resistance value measured when being melted into using sample battery Quasi- value range.
After battery screening plant obtains internal resistance running parameter, so that it may by internal resistance running parameter and default internal resistance parameter Range is compared, and when internal resistance running parameter is unsatisfactory for default internal resistance parameter area, then the target battery is bad battery, electricity Pond screening plant can screen the bad battery.
It should be noted that battery screening plant, before the target battery is determined as bad battery, battery screening fills It sets and needs for the target internal resistance changing value of target battery and default internal resistance variation range to be compared, and by target internal resistance change rate It is compared with default internal resistance change rate range, when target internal resistance changing value is unsatisfactory in default internal resistance variation range or target When resistive rate is unsatisfactory for default internal resistance change rate range, which is just determined as bad battery by battery screening plant.
It should be noted that default internal resistance parameter area is when being melted into using sample battery, according to the internal resistance measured The standard value range that value is calculated, default internal resistance parameter area specifically include: default internal resistance variation range and default interior resistive Rate range.Wherein, presetting internal resistance variation range is when being melted into using sample battery, to be calculated according to the internal resistance measured Internal resistance variation critical field；When default internal resistance change rate range is melted into using sample battery, according to the internal resistance measured The critical field of the internal resistance change rate calculated.
In the embodiment of the present application, the internal resistance running parameter of target battery is unsatisfactory for default internal resistance parameter area, specific to wrap Include: the target internal resistance changing value of target battery is unsatisfactory for the target internal resistance variation of default internal resistance variation range or target battery Rate is unsatisfactory for default internal resistance change rate range.
Illustratively, presetting internal resistance variation range is 0.9-1.1 ohm, presets internal resistance change rate range 0.08-0.12, when Target internal resistance changing value is 2 ohm, and target internal resistance change rate is 0.1, then target internal resistance changing value does not change model in default internal resistance In enclosing, within the scope of default internal resistance change rate, i.e. the target internal resistance changing value of mark battery is unsatisfactory for presetting target internal resistance change rate Internal resistance variation range, then internal resistance running parameter is unsatisfactory for default internal resistance parameter area, and battery screening plant is true by the target battery It is set to bad battery.
It is understood that during target battery chemical conversion, by measuring the internal resistance of target battery, according to target electricity The internal resistance in pond calculates the internal resistance running parameter of target battery, so that battery screening plant can be by the running parameter of the target battery It is compared with default internal resistance parameter area, according to comparing result determination and filters out bad battery, so that battery screening dress Bad battery can be filtered out during Battery formation by setting, reduce battery screening plant filter out bad battery when Between, improve the production efficiency of battery.
Embodiment two
The embodiment of the present application provides a kind of battery screening technique again, and before being step S101, battery screening plant is obtained The process of default internal resistance parameter area, specific implementation step are as shown in Figure 3, comprising:
S201, battery screening plant are using the first predetermined current respectively to sample Battery formation to predeterminated voltage.
Battery screening plant needs first to obtain a collection of sample battery, before screening bad battery with the first predetermined current The sample battery is melted into respectively, when the predeterminated voltage of chemical conversion to sample battery, measures the first internal resistance of sample battery Value and the second sample internal resistance value calculate default internal resistance parameter area according to first internal resistance value and the second sample internal resistance value, into one Step presets internal resistance parameter area according to this and filters out bad battery in target battery.
In the embodiment of the present application, the identical battery of blanking voltage when sample battery is Battery formation.
In the embodiment of the present application, constant charge current when the first predetermined current can be sample Battery formation, first The current value of predetermined current can be the current value no more than sample battery capacity value size, and specific first predetermined current can root It is determined according to actual conditions.
It should be noted that blanking voltage when predeterminated voltage can be sample Battery formation, can also be sample battery It is not melted into the voltage value of any moment to blanking voltage, specific predeterminated voltage can determine according to the actual situation.
It should be noted that environment temperature needs when sample Battery formation are consistent, which can be normal 25 DEG C of temperature, or other environment temperatures, the embodiment of the present application are without limitation.
The first sample internal resistance value of S202, battery screening plant measurement sample battery.
When battery screening plant is by sample Battery formation to predeterminated voltage, battery screening plant begins to measure the sample The first sample internal resistance value of battery.
It should be noted that voltage screening plant measures when the first internal resistance value is sample Battery formation to predeterminated voltage The internal resistance value of sample battery.
S203, after preset time period, battery screening plant measure sample battery the second sample internal resistance value.
After the first sample internal resistance value of battery screening plant measurement sample battery, preset time period can be waited, when this When preset time period reaches, just start the second sample internal resistance value for measuring sample battery.
It in the embodiment of the present application, not only include sample in the internal resistance value that measures when sample Battery formation to predeterminated voltage The true internal resistance value of this battery further includes the floating pressure internal resistance value of sample battery, after preset time period, sample battery it is interior Resistance will settle out, there will be no there is floating pressure internal resistance in the internal resistance of the sample battery measured at this time, so when the internal resistance that measures For the true internal resistance of sample battery.Wherein, the time that sample battery eliminates floating pressure internal resistance is 1-2 hour, when settable default Between section be 1 hour, or 2 hours, the embodiment of the present application do not do specific restriction to this.
In the embodiment of the present application, the second sample internal resistance value is battery screening plant after preset time period, the mesh measured Mark the internal resistance value of battery.
S204, battery screening plant obtain default internal resistance parameter according to first sample internal resistance value and the second sample internal resistance value Range.
After battery screening plant measures the second sample internal resistance, the first sample internal resistance value of sample battery has just been obtained With the second sample internal resistance value, battery screening plant can obtain default internal resistance according to the first sample internal resistance and the second sample internal resistance Parameter area determines mesh to compare using the internal resistance running parameter for presetting internal resistance parameter area and target battery Mark the bad battery in battery.
In the embodiment of the present application, presetting internal resistance parameter area includes: default internal resistance variation range and default internal resistance variation Rate range, wherein default internal resistance variation range is when being melted into using sample battery, to be calculated according to the internal resistance measured The critical field of internal resistance variation；When default internal resistance change rate range is melted into using sample battery, according to the internal resistance meter measured The critical field of the internal resistance change rate calculated.
Specifically, Fig. 4 is a kind of battery screening technique flow chart four provided by the embodiments of the present application, as shown in Fig. 4, S204 can specifically include S2041-S2046.It is as follows:
S2041, battery screening plant calculate first sample internal resistance value the first mean value and the second sample internal resistance value second Mean value；
After battery screening plant obtains the second sample internal resistance value, so that it may calculate sample battery according to the second sample value The second mean value, while obtaining the first sample internal resistance value of measurement, and sample battery is calculated according to the first sample internal resistance value First mean value.
It should be noted that the first mean value is ratio of the sum of the first sample internal resistance value with the quantity of sample battery；Second Mean value is ratio of the sum of the second sample internal resistance value with the quantity of sample battery.
Illustratively, battery screening plant makees sample using the identical battery of 5 blanking voltages, and predeterminated voltage is sample electricity The blanking voltage in pond, when battery screening plant with the constant current of 0.2C respectively to sample Battery formation to blanking voltage when, survey The first sample internal resistance value obtained is respectively 10 ohm, 11 ohm, 10 ohm, 9 ohm, 10 ohm, after preset time period, is measured The second internal resistance value of sample battery be respectively 9 ohm, 10 ohm, 11 ohm, 9 ohm, 9 ohm, then the first mean value is first The ratio of the sum of sample internal resistance value and sample number of batteries is 10 ohm；Second mean value is the sum of second sample internal resistance value and sample The ratio of this number of batteries is 9.6 ohm.
S2042, battery screening plant are by the difference of the second mean value and the first mean value, as sample internal resistance changing value.
After battery screening plant obtains the first mean value and the second mean value of sample battery, so that it may utilize the first mean value With the second mean value computation sample internal resistance changing value.
It should be noted that sample internal resistance changing value can be the difference of the second mean value and the first mean value of sample battery, Or the ratio between the second mean value and the first mean value, it can also be to be come out by the second mean value and the first mean value computation The calculation of the value of other forms, specific sample internal resistance changing value can determine according to the actual situation, the embodiment of the present application It does not limit this.
Illustratively, the second mean value that battery screening plant calculates is 9.6 ohm, and the first mean value is 10 ohm, then sample This internal resistance changing value is the difference of the second mean value and the first mean value, is 0.4 ohm.
S2043, battery screening plant utilize sample internal resistance changing value and the first mean value, obtain sample internal resistance change rate.
After battery screening plant obtains sample internal resistance changing value, so that it may according to sample internal resistance changing value and first Value, obtains sample internal resistance change rate.
It should be noted that sample internal resistance change rate is the ratio of sample internal resistance changing value and the first mean value.
Illustratively, the sample internal resistance changing value that battery screening plant obtains is 0.4 ohm, the first mean value of sample battery It is 10 ohm, then sample internal resistance change rate is the ratio of sample internal resistance changing value and the first mean value, is 0.04.
S2044, battery screening plant are determined as default internal resistance on the basis of sample internal resistance change rate, by the second preset range Change rate range.
After battery screening plant obtains sample internal resistance change rate, just on the basis of the sample internal resistance change rate, by Sample internal resistance change rate in two preset ranges is gathered, and default internal resistance change rate range has just been obtained.
It should be noted that the second preset range is the deviation range of sample internal resistance change rate, as sample internal resistance changes Rate is 0.1, and the first preset range can be the range that deviation is 0.02, then presetting internal resistance variation range is 0.08-0.12.
S2045, battery screening plant are determined as default internal resistance on the basis of sample internal resistance changing value, by the first preset range Variation range.
It is pre- by first just on the basis of the sample changed value after battery screening plant obtains sample internal resistance changing value If the sample internal resistance changing value in range is gathered, default internal resistance variation range has just been obtained.
It should be noted that S2043 and S2045 is latter two step arranged side by side of S2042, specifically according to the actual situation Selection executes, and the embodiment of the present application, which does not limit, specific executes sequence.
In the embodiment of the present application, the first preset range is the deviation range of sample internal resistance changing value, e.g., sample internal resistance Changing value is 2, and the first preset range can be the range that deviation is 1, then presetting internal resistance variation range is 1-3.
Default internal resistance variation range and default internal resistance change rate range are determined as in default by S2046, battery screening plant Hinder parameter area.
When battery screening plant obtains default internal resistance variation range, the default internal resistance change rate range that just will acquire Internal resistance variation range, which is preset, with this is determined as default internal resistance parameter area.
It is understood that the embodiment of the present application is by measuring the internal resistance value of sample battery, root in sample Battery formation The default internal resistance parameter area of sample battery is calculated according to the internal resistance value of sample battery, it, can should when target battery chemical conversion The running parameter when chemical conversion of default internal resistance parameter area and target battery compares, and determines target according to the comparing result Bad battery in battery, so that battery screening plant can filter out bad battery during target battery is melted into, Reduce the time that battery screening plant filters out bad battery, improves the production efficiency of battery.
Embodiment three
The embodiment of the present application also provides a kind of battery screening techniques, and after being step S202, battery screening plant is rejected Bad sample battery in sample battery utilizes remaining sample battery, i.e. the second sample that is, after rejecting first sample battery Battery obtains the process of default internal resistance parameter area, and specific implementation step is as shown in Fig. 5, comprising:
S301, battery screening plant calculate the first mean value of first sample internal resistance value.
When battery screening plant is after measuring the first sample internal resistance of sample battery, so that it may according in the first sample First mean value of computing the resistor value sample battery.
It should be noted that the first mean value is ratio of the sum of the first sample internal resistance value with the quantity of sample battery.
Illustratively, battery screening plant makees sample using the identical battery of 5 blanking voltages, and predeterminated voltage is sample electricity The blanking voltage in pond, when battery screening plant with the constant current of 0.2C respectively to sample Battery formation to blanking voltage when, survey The first sample internal resistance value obtained is respectively 10 ohm, 11 ohm, 10 ohm, 9 ohm, 10 ohm, then the first mean value is the first sample The ratio of the sum of this internal resistance value and sample number of batteries is 10 ohm.
S302, battery screening plant are determined as sample internal resistance value range on the basis of the first mean value, by third preset range.
It, will be in third preset range just on the basis of first mean value after battery screening plant obtains the first mean value Sample internal resistance value gathered, just obtained sample internal resistance value range.
It should be noted that third preset range is the deviation range of sample internal resistance changing value, e.g., sample internal resistance value is 10 ohm, third preset range can be the range that deviation is 1, then presetting internal resistance variation range is 9-11.
S303, battery screening plant delete the first sample battery for being unsatisfactory for sample internal resistance value range from sample battery, And the third sample internal resistance value and the 4th sample internal resistance value of the second sample battery are measured, the second sample battery is to remove in sample battery Battery outside first sample battery；4th sample internal resistance value is after measuring third sample internal resistance value, to survey by preset time period The internal resistance value of the second sample battery obtained.
After battery screening plant obtains sample internal resistance value range, so that it may by sample internal resistance value not in the sample internal resistance model First sample battery in enclosing is deleted, to obtain the second sample battery, and sample battery is calculated in the second sample battery Third sample internal resistance value and the 4th sample internal resistance value.
In the embodiment of the present application, first sample battery is the sample battery that internal resistance is unsatisfactory for sample internal resistance value range；The Two sample batteries are the battery in sample battery in addition to first sample battery；Third sample internal resistance value is the second sample electricity measured The internal resistance value in pond；4th sample internal resistance value is the second sample for measuring by preset time period after measuring third sample internal resistance value The internal resistance value of this battery.
S304, battery screening plant obtain default internal resistance parameter according to third sample internal resistance value and the 4th sample internal resistance value Range.
After battery screening plant obtains the internal resistance of third sample and the 4th sample internal resistance, so that it may according in third sample Resistance and the 4th sample internal resistance obtain default internal resistance parameter area, using in default the internal resistance parameter area and target battery Resistance running parameter compares, and determines the bad battery in target battery.
In the embodiment of the present application, presetting internal resistance parameter area includes: default internal resistance variation range and default internal resistance variation Rate range, wherein default internal resistance variation range is when being melted into using sample battery, to be calculated according to the internal resistance measured The critical field of internal resistance variation；When default internal resistance change rate range is melted into using sample battery, according to the internal resistance meter measured The critical field of the internal resistance change rate calculated.
In the embodiment of the present application, battery screening plant can utilize the mean value and the 4th sample value of third sample internal resistance value The difference of mean value obtains sample internal resistance changing value；Using the ratio of sample internal resistance changing value and the mean value of third sample internal resistance value, obtain To sample internal resistance change rate；On the basis of sample internal resistance change rate, the second preset range is determined as default internal resistance change rate model It encloses；On the basis of sample internal resistance changing value, the first preset range is determined as default internal resistance variation range, thus battery screening dress It sets and can be obtained by default internal resistance parameter area.
It is understood that the embodiment of the present application by calculate sample battery sample internal resistance range, by sample internal resistance The sample battery that value is unsatisfactory for the sample internal resistance range is deleted, and is calculated sample internal resistance value and is met the second of the sample internal resistance range The third sample internal resistance value and the 4th sample internal resistance value of sample battery, according to the third sample internal resistance value and the 4th sample internal resistance value The default internal resistance parameter area for calculating sample battery, improves the accuracy of default internal resistance range, improves battery screening plant Screen the accuracy of bad battery.
Example IV
The embodiment of the present application provides a kind of battery screening technique again, is after step S2041, battery screening plant passes through Charging at least once is carried out to sample battery, obtains the process of default internal resistance parameter area, specific implementation step such as Fig. 6 institute Show, comprising:
S401, battery screening plant obtain sample battery at least once and charge corresponding at least one first mean value and at least One the second mean value.
The first mean value of first sample internal resistance value and the second mean value of the second sample internal resistance value are obtained when battery screening plant Later, it can also be charged at least once, and be obtained when sample battery charges to predeterminated voltage each time, sample to sample battery The first sample internal resistance value of this battery and the second sample internal resistance value, and according to first sample internal resistance value and the second sample internal resistance value point Not Ji Suan sample battery the first mean value and the second mean value, therefore charged at least once to sample battery, so that it may obtain sample At least one first mean value of this battery and at least one second mean value；Battery screening plant can obtain the sample electricity at least once Charge at least one corresponding first mean value and at least one second mean value in pond.
It should be noted that at least one first mean value is to be charged to predeterminated voltage at least once to sample battery When, the first mean value of the sample battery being calculated；At least one second mean value is that sample battery is charged at least once When predeterminated voltage, after preset time period, the second mean value of the sample battery being calculated.
S402, battery screening plant obtain third mean value according at least one first mean value and preset charged number；It is default Charging times are the charging times to be charged at least once to sample battery.
After battery screening plant gets at least one first mean value, can according to this at least one first mean value and pre- If charging times, the third mean value of sample battery is calculated.
It should be noted that third mean value is ratio of the sum of first mean value with the quantity of the first mean value；Preset charged time Number is the charging times to be charged at least once to sample battery.
Illustratively, preset charged number is 3 times, and battery screening plant has got 3 the first mean values, respectively 10 Europe Nurse, 9 ohm, 11 ohm, then it is 10 ohm that third mean value, which is ratio of the sum of first mean value with the quantity of the first mean value,.
S403, battery screening plant obtain the 4th mean value according at least one second mean value and preset charged number.
After battery screening plant gets at least one second mean value, can according to this at least one second mean value and pre- If charging times, the 4th mean value of sample battery is calculated.
It should be noted that S403 and S402 is latter two step arranged side by side of S401, specifically select according to the actual situation Select execution, the embodiment of the present application, which does not limit, specific executes sequence.
It should be noted that the 4th mean value is ratio of the sum of second mean value with the quantity of the second mean value.
Illustratively, preset charged number is 3 times, and battery screening plant has got 3 the second mean values, respectively 10 Europe Nurse, 9 ohm, 11 ohm, then it is 10 ohm that the 4th mean value, which is ratio of the sum of second mean value with the quantity of the second mean value,.
S404, battery screening plant are by the difference of the 4th mean value and third mean value, as sample internal resistance changing value.
After battery screening plant obtains the third mean value and four mean values of sample battery, so that it may utilize third mean value With the 4th mean value computation sample internal resistance changing value.
In the embodiment of the present application, sample internal resistance changing value is the difference of the 4th mean value and third mean value of sample battery, Or the ratio between the 4th mean value and third mean value, it can also be to be come out by the 4th mean value and third mean value computation The calculation of the value of other forms, specific sample internal resistance changing value can determine according to the actual situation, the embodiment of the present application It does not limit this.
Illustratively, the 4th mean value that battery screening plant calculates is 9.6 ohm, and third mean value is 10 ohm, then sample This internal resistance changing value is the difference of the 4th mean value and third mean value, is 0.4 ohm.
S405, battery screening plant utilize sample internal resistance changing value and third mean value, obtain sample internal resistance change rate.
After battery screening plant obtains sample internal resistance changing value, so that it may equal according to sample internal resistance changing value and third Value, obtains sample internal resistance change rate.
In the embodiment of the present application, sample internal resistance change rate is the ratio of sample internal resistance changing value and third mean value.
Illustratively, the sample internal resistance changing value that battery screening plant obtains is 0.4 ohm, the third mean value of sample battery It is 10 ohm, then sample internal resistance change rate is the ratio of sample internal resistance changing value and third mean value, is 0.04.
S406, battery screening plant are determined as default internal resistance on the basis of sample internal resistance change rate, by the second preset range Change rate range.
It should be noted that S406 realizes that S2044 was realized in the description and embodiment one of process in the embodiment of the present invention The process description of the description of journey is consistent, and details are not described herein.
S407, battery screening plant are determined as default internal resistance on the basis of sample internal resistance changing value, by the first preset range Variation range.
It should be noted that S405 and S407 is latter two step arranged side by side of S404, specifically select according to the actual situation Select execution, the embodiment of the present application, which does not limit, specific executes sequence.
It should be noted that S407 realizes that S2045 was realized in the description and embodiment one of process in the embodiment of the present invention The process description of the description of journey is consistent, and details are not described herein.
It is understood that by repeatedly charging to predeterminated voltage to sample battery, and repeatedly measure and be calculated and is more The first mean value and the second mean value of a sample battery, calculate separately to obtain again according to multiple first mean value and multiple second mean values The higher third mean value of accuracy and the 4th mean value, the default internal resistance of sample battery is calculated according to third mean value and the 4th mean value Parameter area improves the accuracy of default internal resistance parameter area, further improves battery screening plant screening target battery When accuracy.
Embodiment five
Based on embodiment one to the same inventive concept of example IV, the embodiment of the present application provides a kind of battery screening plant 1, correspond to a kind of battery screening technique；Fig. 7 is that a kind of composed structure of battery screening plant provided by the embodiments of the present application is shown It is intended to one, which may include:
Measuring unit 11, for when being melted into target battery to predeterminated voltage using the first predetermined current, described in measurement First internal resistance value of target battery, the predeterminated voltage are less than or equal to the blanking voltage of the target battery, the cut-off Voltage attainable ceiling voltage when being melted into for the target battery；When reaching preset time period, the target electricity is measured Second internal resistance value in pond；
Computing unit 12, for calculating the target battery according to first internal resistance value and second internal resistance value Internal resistance running parameter；
Screening unit 13, for when the internal resistance running parameter is unsatisfactory for default internal resistance parameter area, by the target Battery is determined as bad battery, and the default internal resistance parameter area is when being melted into using sample battery, in measuring The standard value range that computing the resistor value comes out.
In some embodiments of the present application, charhing unit is provided in the battery screening plant；
The charhing unit 14, for using first predetermined current respectively to the sample Battery formation to described pre- If voltage；
The measuring unit 11 is also used to measure the first sample internal resistance value of the sample battery；In the preset time Duan Hou measures the second sample internal resistance value of the sample battery；
The computing unit 12 is also used to be obtained according to the first sample internal resistance value and the second sample internal resistance value The default internal resistance parameter area.
In some embodiments of the present application, the computing unit 12 is specifically used for utilizing second internal resistance value and institute The first internal resistance value is stated, target internal resistance changing value is obtained；Using the target internal resistance changing value and first internal resistance value, mesh is obtained Mark internal resistance change rate；The target internal resistance changing value and the target internal resistance change rate are determined as the internal resistance running parameter.
In some embodiments of the present application, the computing unit 12 is specifically used for calculating the first sample internal resistance value The first mean value and the second sample internal resistance value the second mean value；By the difference of second mean value and first mean value, As sample internal resistance changing value；On the basis of the sample internal resistance changing value, the first preset range is determined as described default interior Hinder variation range；Using the sample internal resistance changing value and first mean value, sample internal resistance change rate is obtained；With the sample On the basis of internal resistance change rate, the second preset range is determined as the default internal resistance change rate range；By the default interior resistive Change range and the default internal resistance change rate range is determined as the default internal resistance parameter area.
In some embodiments of the present application, the screening unit 13 is also used to the target internal resistance changing value and institute It states default internal resistance variation range to be compared, and the target internal resistance change rate and the default internal resistance change rate range is carried out Compare；When to be unsatisfactory for the default internal resistance variation range or the target internal resistance change rate discontented for the target internal resistance changing value When the foot default internal resistance change rate range, the target battery is determined as bad battery.
In some embodiments of the present application, the computing unit 12 is also used to calculate the first sample internal resistance value First mean value；On the basis of first mean value, third preset range is determined as sample internal resistance value range；According to third sample Internal resistance value and the 4th sample internal resistance value obtain the default internal resistance parameter area；
The measuring unit 11, is also used to delete from the sample battery and is unsatisfactory for the of the sample internal resistance value range One sample battery, and the third sample internal resistance value and the 4th sample internal resistance value of the second sample battery are measured, described the Two sample batteries are the battery in the sample battery in addition to the first sample battery；The 4th sample internal resistance value is to measure After the third sample internal resistance value, by the internal resistance value for the second sample battery that the preset time period measures.
In some embodiments of the present application, the computing unit 12 is also used to obtain the sample battery at least once At least one corresponding described first mean value that charges and at least one described second mean value；According to the first mean value described at least one With preset charged number, third mean value is obtained, the preset charged number is to be charged at least once to the sample battery Charging times；According to the second mean value described at least one and the preset charged number, the 4th mean value is obtained.
In some embodiments of the present application, the computing unit 12 is specifically used for the 4th mean value and described the The difference of three mean values, as the sample internal resistance changing value；Using the sample internal resistance changing value and the third mean value, obtain The sample internal resistance change rate.
It should be noted that in practical applications, above-mentioned measuring unit 11, computing unit 12, screening unit 13 and charging Unit 14 can realize by the processor 15 on battery screening plant 1, specially CPU (Central Processing Unit, in Central processor), MPU (Microprocessor Unit, microprocessor), DSP (Digital Signal Processing, number Word signal processor) or field programmable gate array (FPGA, Field Programmable Gate Array) etc. realize；On Stating data storage can be realized by the memory 16 on battery screening plant 1.
The embodiment of the present application also provides a kind of battery screening plants 1, as shown in figure 8, the battery screening plant 1 wraps Include: processor 15, memory 16 and communication bus 17, the memory 16 pass through the communication bus 17 and the processor 15 It is communicated, the memory 16 stores the program of the executable battery screening of the processor 15, when battery screening Program is performed, and executes the battery screening technique as described in embodiment one to example IV by the processor 15.
In practical applications, above-mentioned memory 16 can be volatile memory (volatile memory), such as at random It accesses memory (Random-Access Memory, RAM)；Or nonvolatile memory (non-volatile Memory), such as read-only memory (Read-Only Memory, ROM), flash memory (flash memory), hard disk (Hard Disk Drive, HDD) or solid state hard disk (Solid-State Drive, SSD)；Or the memory of mentioned kind Combination, and instruction and data is provided to processor 15.
The embodiment of the present application provides a kind of computer readable storage medium, is stored thereon with program, and described program is located Manage the battery screening technique realized as described in embodiment one to example IV when device 15 executes.
It is understood that the embodiment of the present application is by measuring the internal resistance value of sample battery, root in sample Battery formation The default internal resistance parameter area of sample battery is calculated according to the internal resistance value of sample battery, it, can should when target battery chemical conversion The running parameter when chemical conversion of default internal resistance parameter area and target battery compares, and determines target according to the comparing result Bad battery in battery, so that battery screening plant can filter out bad battery during target battery is melted into, Reduce the time that battery screening plant filters out bad battery, improves the production efficiency of battery.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program Product.Therefore, the shape of hardware embodiment, software implementation or embodiment combining software and hardware aspects can be used in the present invention Formula.Moreover, the present invention, which can be used, can use storage in the computer that one or more wherein includes computer usable program code The form for the computer program product implemented on medium (including but not limited to magnetic disk storage and optical memory etc.).
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.

Claims (18)

1. a kind of battery screening technique, which is characterized in that the described method includes:
When being melted into target battery to predeterminated voltage using the first predetermined current, the first internal resistance of the target battery is measured Value, the predeterminated voltage are less than or equal to the blanking voltage of the target battery, and the blanking voltage is the target battery Institute's attainable ceiling voltage when chemical conversion；
When reaching preset time period, the second internal resistance value of the target battery is measured；
According to first internal resistance value and second internal resistance value, the internal resistance running parameter of the target battery is calculated；
When the internal resistance running parameter is unsatisfactory for default internal resistance parameter area, the target battery is determined as bad battery, The default internal resistance parameter area is the standard value calculated according to the internal resistance value measured when being melted into using sample battery Range.
2. the method according to claim 1, wherein the first internal resistance value of the measurement target battery it Before, the method also includes:
Using first predetermined current respectively to the sample Battery formation to the predeterminated voltage；
Measure the first sample internal resistance value of the sample battery；
After the preset time period, the second sample internal resistance value of the sample battery is measured；
According to the first sample internal resistance value and the second sample internal resistance value, the default internal resistance parameter area is obtained.
3. the method according to claim 1, wherein described according to first internal resistance value and second internal resistance Value, calculates the internal resistance running parameter of the target battery, comprising:
Using second internal resistance value and first internal resistance value, target internal resistance changing value is obtained；
Using the target internal resistance changing value and first internal resistance value, target internal resistance change rate is obtained；
The target internal resistance changing value and the target internal resistance change rate are determined as the internal resistance running parameter.
4. according to the method described in claim 2, it is characterized in that, described according to the first sample internal resistance value and described second Sample internal resistance value obtains the default internal resistance parameter area, comprising:
Calculate the first mean value of the first sample internal resistance value and the second mean value of the second sample internal resistance value；
By the difference of second mean value and first mean value, as sample internal resistance changing value；
On the basis of the sample internal resistance changing value, the first preset range is determined as the default internal resistance variation range；
Using the sample internal resistance changing value and first mean value, sample internal resistance change rate is obtained；
On the basis of the sample internal resistance change rate, the second preset range is determined as the default internal resistance change rate range；
The default internal resistance variation range and the default internal resistance change rate range are determined as the default internal resistance parameter area.
5. according to the method described in claim 4, it is described the target battery is determined as bad battery before, the method is also Include:
The target internal resistance changing value and the default internal resistance variation range are compared, and by the target internal resistance change rate It is compared with the default internal resistance change rate range；
Correspondingly, described be determined as bad battery for the target battery, comprising:
When the target internal resistance changing value is unsatisfactory for the default internal resistance variation range or the target internal resistance change rate is unsatisfactory for When the default internal resistance change rate range, the target battery is determined as bad battery.
6. according to the method described in claim 2, it is characterized in that, the first sample internal resistance value of the measurement sample battery Later, the method also includes:
Calculate the first mean value of the first sample internal resistance value；
On the basis of first mean value, third preset range is determined as sample internal resistance value range；
The first sample battery for being unsatisfactory for the sample internal resistance value range is deleted from the sample battery, and measures the second sample The third sample internal resistance value and the 4th sample internal resistance value of battery, the second sample battery are in the sample battery except described the Battery outside one sample battery；The 4th sample internal resistance value is after measuring the third sample internal resistance value, by described pre- If the internal resistance value for the second sample battery that the period measures；
Correspondingly, it is described according to the first sample internal resistance value and the second sample internal resistance value, obtain the default internal resistance ginseng Number range, comprising:
According to the third sample internal resistance value and the 4th sample internal resistance value, the default internal resistance parameter area is obtained.
7. according to the method described in claim 4, it is characterized in that, first mean value for calculating the first sample internal resistance value After the second mean value of the second sample internal resistance value, the method also includes:
Obtain the sample battery at least once charge at least one corresponding described first mean value and at least one described second Mean value；
According to the first mean value described at least one and preset charged number, third mean value is obtained, the preset charged number is pair The charging times that the sample battery is charged at least once；
According to the second mean value described at least one and the preset charged number, the 4th mean value is obtained.
8. the method according to the description of claim 7 is characterized in that the difference by second mean value and first mean value Value, as sample internal resistance changing value, comprising:
By the difference of the 4th mean value and the third mean value, as the sample internal resistance changing value；
Correspondingly, described utilize the sample internal resistance changing value and first mean value, sample internal resistance change rate is obtained, comprising:
Using the sample internal resistance changing value and the third mean value, the sample internal resistance change rate is obtained.
9. a kind of battery screening plant, which is characterized in that described device includes:
Measuring unit, for when being melted into target battery to predeterminated voltage using the first predetermined current, measuring the target electricity First internal resistance value in pond, the predeterminated voltage are less than or equal to the blanking voltage of the target battery, and the blanking voltage is Institute's attainable ceiling voltage when the target battery is melted into；When reaching preset time period, the of the target battery is measured Two internal resistance values；
Computing unit, for calculating the interior resistive of the target battery according to first internal resistance value and second internal resistance value Change parameter；
Screening unit, it is for when the internal resistance running parameter is unsatisfactory for default internal resistance parameter area, the target battery is true It is set to bad battery, the default internal resistance parameter area is when being melted into using sample battery, according to the internal resistance value meter measured The standard value range calculated.
10. device according to claim 9, which is characterized in that described device further includes charhing unit,
The charhing unit, for utilizing first predetermined current respectively to the sample Battery formation to the default electricity Pressure；
The measuring unit is also used to measure the first sample internal resistance value of the sample battery；After the preset time period, survey Measure the second sample internal resistance value of the sample battery；
The computing unit is also used to be obtained described pre- according to the first sample internal resistance value and the second sample internal resistance value If internal resistance parameter area.
11. device according to claim 9, which is characterized in that
The computing unit is specifically used for utilizing second internal resistance value and first internal resistance value, obtains target internal resistance variation Value；Using the target internal resistance changing value and first internal resistance value, target internal resistance change rate is obtained；By resistive in the target Change value and the target internal resistance change rate are determined as the internal resistance running parameter.
12. device according to claim 10, which is characterized in that
The computing unit, the first mean value and the second sample internal resistance value specifically for the calculating first sample internal resistance value The second mean value；By the difference of second mean value and first mean value, as sample internal resistance changing value；In the sample On the basis of hindering changing value, the first preset range is determined as the default internal resistance variation range；Changed using the sample internal resistance Value and first mean value, obtain sample internal resistance change rate；On the basis of the sample internal resistance change rate, by the second preset range It is determined as the default internal resistance change rate range；The default internal resistance variation range and the default internal resistance change rate range is true It is set to the default internal resistance parameter area.
13. device according to claim 12, which is characterized in that
The screening unit is also used to for the target internal resistance changing value and the default internal resistance variation range being compared, and The target internal resistance change rate and the default internal resistance change rate range are compared；When the target internal resistance changing value is discontented It, will when the foot default internal resistance variation range or the target internal resistance change rate are unsatisfactory for the default internal resistance change rate range The target battery is determined as bad battery.
14. device according to claim 10, which is characterized in that
The computing unit is also used to calculate the first mean value of the first sample internal resistance value；On the basis of first mean value, Third preset range is determined as sample internal resistance value range；According to third sample internal resistance value and the 4th sample internal resistance value, institute is obtained State default internal resistance parameter area；
The measuring unit is also used to delete the first sample for being unsatisfactory for the sample internal resistance value range from the sample battery Battery, and the third sample internal resistance value and the 4th sample internal resistance value of the second sample battery are measured, the second sample battery is institute State the battery in sample battery in addition to the first sample battery；The 4th sample internal resistance value is to measure in the third sample After resistance value, by the internal resistance value for the second sample battery that the preset time period measures.
15. device according to claim 12, which is characterized in that
The computing unit is also used to obtain at least one corresponding described first mean value of the sample battery charging at least once With the second mean value described at least one；According to the first mean value described at least one and preset charged number, third mean value, institute are obtained Stating preset charged number is the charging times to be charged at least once to the sample battery；According to described at least one second Mean value and the preset charged number, obtain the 4th mean value.
16. device according to claim 15, which is characterized in that
The computing unit, specifically for by the difference of the 4th mean value and the third mean value, as the sample internal resistance Changing value；Using the sample internal resistance changing value and the third mean value, the sample internal resistance change rate is obtained.
17. a kind of battery screening plant, which is characterized in that described device includes:
Memory, processor and communication bus, the memory are communicated by the communication bus with the processor, institute The program that memory stores the executable battery screening of the processor is stated, when the program of battery screening is performed, is led to It crosses the processor and executes method as claimed in any one of claims 1 to 8.
18. a kind of storage medium, is stored thereon with computer program, it is applied to battery screening plant, which is characterized in that the calculating Claim 1 to 8 described in any item methods are realized when machine program is executed by processor.
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