CN110501649A - A kind of lithium battery Conformance Assessment test method - Google Patents
A kind of lithium battery Conformance Assessment test method Download PDFInfo
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- CN110501649A CN110501649A CN201910680535.0A CN201910680535A CN110501649A CN 110501649 A CN110501649 A CN 110501649A CN 201910680535 A CN201910680535 A CN 201910680535A CN 110501649 A CN110501649 A CN 110501649A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 21
- 238000010998 test method Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000007600 charging Methods 0.000 claims description 35
- 230000005611 electricity Effects 0.000 claims description 11
- 230000002459 sustained effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000003068 static effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005183 dynamical system Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G17/00—Apparatus for or methods of weighing material of special form or property
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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
-
- 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
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
This application discloses a kind of lithium battery Conformance Assessment test methods, it passes through the pressure difference in static parameter voltage, internal resistance, weight to lithium battery etc. and dynamic charge and discharge process, DC internal resistance, shelve in pressure difference and capacity keep and recovery tested, it is tested with the test mode being association of activity and inertia, the battery with two side terminals effectively guaranteed.It applies in production process, the consistency combo of product can be improved, improve the performance of product, reduce failure risk.
Description
Technical field
This application involves a kind of lithium battery Conformance Assessment test methods.
Background technique
What the dynamical system that new-energy automobile uses currently on the market was substantially arranged in pairs or groups is all lithium ion battery, including is used
In energy storage field.And the consistency quality of lithium ion battery is directly related to the performance and used life of product, it even can shadow
Ring the security performance for arriving product.Conventional product can all increase external management system and balanced way to guarantee to supervise and manage and produce
The charging and discharging state of battery inside product improves battery with two side terminals.
It is even up to several since the single battery (cylindrical battery) applied in a set product can reach thousands of up to ten thousand
100000, this just needs manufacturing enterprise to manage to its consistency during battery combo.Currently, most of lithium electricity
What pond PACK enterprise used is all that the static methods such as more traditional voltage, capacity, internal resistance carry out sorting combo to lithium battery, so
Afterwards in groups, such product does not ensure that the consistency in use process, and the pressure difference of lithium battery can be increasingly after long-time service
Greatly, the performance and user experience of product are seriously affected.
Summary of the invention
The purpose of the application, is: propose a kind of lithium battery Conformance Assessment test method, with the battery consistency to charging into
Row assessment, evaluation battery with two side terminals quality, in this way, the lithium battery sorting in normal production process can be applied to
Combo improves the performance of product, reduces failure risk.
The technical solution of the application is:
A kind of lithium battery Conformance Assessment test method, which is characterized in that this method includes the following steps sequentially carried out:
1) certain amount is randomly selected from batch battery, according to the weight of battery and internal resistance requirement, rejects unqualified electricity
Pond；
2) under normal temperature environment, according to the specification of battery, standard charging and mark are carried out to spec battery in step 1)
Quasi- electric discharge, measures capacity C of each battery under normal temperature environment1And ENERGY E1, according to the discharge capacity and energy requirement of battery,
Reject unqualified battery；
3) with electric current I1To the end of charge voltage of spec battery constant-current charge in step 2) to battery, time t is shelved1, so
Afterwards with electric current I2To the discharge cut-off voltage of battery constant-current discharge to battery, time t is shelved2；
According to test result, made during shelving after battery voltage-capacity curve during the charging process, charging respectively
Voltage-time curve, the voltage-capacity curve in discharge process, shelved after electric discharge during voltage-time curve, pick
Except the unqualified battery poor with standard curve registration；
4) SOC of spec battery in step 3) is adjusted to 10~20% with standard charging current, shelves 2 hours, records
The voltage V of battery after shelving1, the sustained ceiling current I that is then allowed at the SOC using the battery3Electric discharge 10 seconds, note
Record the 10th second voltage V2, calculate DC internal resistance R of the battery under the SOC state1；
Battery capacity is vented with standard discharge system, later adjusted the SOC of battery to 80 with standard charging current~
90%, it shelves 2 hours, the voltage V of battery after record is shelved3, electricity is then continued with the maximum that battery allows at the SOC
Flow I4Electric discharge 10 seconds, the 10th second voltage V of record4, calculate DC internal resistance R of the battery under the SOC state2；
Calculate the DC internal resistance R of all batteries1Average value R1', calculate the DC internal resistance of all batteries
R2Average value R2', by the DC internal resistance R of each battery1With the average value R1' compare, by the described straight of each battery
Flow internal resistance R2With the average value R2' compare, reject R1With R1' unqualified battery of the difference outside claimed range, while rejecting R2
With R2' unqualified battery of the difference outside claimed range；
5) with standard charging current that spec battery in step 4) is fully charged, it is shelved under normal temperature environment 2 hours, measures battery
Voltage V5；
Battery is transferred in high temperature T environment storehouse and shelves a period of time, takes out battery under normal temperature environment from the environment storehouse
It shelves 2 hours, measures the voltage V of battery6；
Compare V5And V6, reject V5With V6Unqualified battery of the difference outside claimed range；
6) according to the specification of battery, standard electric discharge, test capacity, record electricity are carried out to spec battery in step 5)
The discharge capacity C in pond2；Then a standard cycle is carried out again, records the capacity C of battery3；
Compare C2And C1, while comparing C2And C3Compare, rejects C2With C1Unqualified battery of the ratio outside claimed range, is picked
Except C2With C3Unqualified battery of the ratio outside claimed range.
The application further includes following preferred embodiment based on the above technical solution:
The I1Standard charging current as defined in specifications for battery.
In the step 3), with electric current I1To spec battery constant-current charge in step 2) to the end of charge voltage of battery
Afterwards, then with the end of charge voltage to battery constant-voltage charge, during aforementioned constant-voltage charge, when charging current is reduced to
0.25I1When stop charging, shelve the time t1。
The V5For the discharge cut-off voltage of battery.
In the step 2), E is rejected1It is greater than the battery of 25mAh with the difference of rated capacity, rejects C1With rated energy
Difference be greater than 0.05Wh battery.
In the step 3), compared with standard curve, voltage difference is greater than 15mV under identical capacity in rejecting charging process
Battery, reject in discharge process that voltage difference is greater than the battery of 25mV under identical capacity.
In the step 4), R is rejected1With R1' difference be greater than 0.5m Ω battery, reject R2With R2' difference be greater than 0.5m
The battery of Ω.
In the step 5), V is rejected5With V6Difference be greater than 30mV battery.
In the step 6), C is rejected2With C1Ratio be lower than 98% battery, reject C2With C3Ratio 98~
Battery outside 102% range.
The t1And t2It is 30min, the I2Standard discharge current as defined in specifications for battery.
The advantages of the application, is: passing through static parameter voltage, internal resistance, weight to lithium battery etc. and dynamic charge and discharge
Pressure difference in the process, DC internal resistance, shelve in pressure difference and capacity keep and recovery tested, with the test side being association of activity and inertia
Formula is tested, the battery with two side terminals effectively guaranteed.It applies in production process, the consistency combo of product can be improved,
The performance of product is improved, failure risk is reduced.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to required use in embodiment description
Attached drawing be briefly described, the drawings in the following description are only some examples of the present application, skill common for this field
For art personnel, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the operating process schematic diagram of the embodiment of the present application.
Specific embodiment
The application is described in further detail below by specific embodiment combination attached drawing.The application can be with a variety of
Different forms is realized, however it is not limited to embodiment described in the present embodiment.The purpose of following specific embodiments is provided
It is easy for becoming apparent from present disclosure thorough explanation, wherein the words of the indicating positions such as upper and lower, left and right is only needle
To shown structure in respective figure for position.
However, those skilled in the art may be aware that one or more detail description can be by
Omit, or can also adopt with other methods, component or material.In some instances, some embodiments are not described
Or it is not described later in detail.
In addition, technical characteristic described herein, technical solution can also be in one or more embodiments arbitrarily to close
Suitable mode combines.For those skilled in the art, it should be readily appreciated that method related with embodiment provided herein
Step or operation order can also change.Therefore, any sequence in drawings and examples is merely illustrative purposes, not secretly
Show requirement in a certain order, is required unless expressly stated according to a certain sequence.
It is herein component institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any sequence or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
As shown in connection with fig. 1, the present embodiment carries out the lithium ion cylinder shape battery of come a collection of model INR18650
Conformance Assessment test, the specifications of this batch of battery are shown: its voltage rating is 3.6V, charge cutoff voltage 4.2V, electric discharge
Blanking voltage is 2.75V, rated capacity 2.6Ah, rated energy 9.36Wh, and standard weights is 44 ± 1g, in standard
Resistance is 18 ± 1m Ω.
The standard charging mode of the battery are as follows: with the electric current of 0.52A by constant-current charging of battery to 4.2V, continue with 4.2V's
Voltage charges to battery, until battery is shelved 30min after the charging current of battery is decreased to 0.13A；
The standard discharge mode of the battery are as follows: again with the electric current of 1.3A by battery discharge to 2.75V.
The Conformance Assessment test method includes the following steps sequentially carried out:
1) 10 are randomly selected from batch battery, and this 10 batteries are numbered, and reject those weight or interior
Hinder undesirable battery.Specifically: first with the weight and internal resistance of electronic balance and voltage internal resistance test device test battery, picking
Battery in addition to standard weights range, while the battery outside standard internal resistance range is also rejected, remaining spec battery is carried out down
State the operation of step 2).
2) under normal temperature environment, according to the specification of battery, a standard charging is carried out to spec battery in step 1)
It discharges with standard, measures capacity C of each battery under normal temperature environment1And ENERGY E1.Specifically: with the electric current of 0.52A by battery
Constant-current charge to 4.2V, continuation charges to battery with the voltage of 4.2V, until after the charging current of battery is decreased to 0.13A, it will
Battery shelves 30min；Then again with the electric current of 1.3A by battery discharge to 2.75V, the capacity C of battery under normal temperature environment is measured1
And ENERGY E1。
The capacity C that test is obtained1And ENERGY E1It compares, picks with the rated capacity of the battery and rated energy respectively
Except the battery for being greater than 20mAh (± 20mAh) with the difference of rated capacity, while also rejecting with rated energy difference greater than 0.05Wh
The battery of (± 0.05Wh).
To remaining spec battery carry out following step 3) operation.
3) with the end of charge voltage 4.2V of the current versus cell constant-current charge of electric current 0.52A to battery, continue with 4.2V
Voltage to battery constant-voltage charge, until charging current stops charging after being decreased to 0.13A, after battery is shelved 30min, with
The current versus cell constant-current discharge of 2.6A is to voltage 3.0V (since battery has been substantially at sky electricity condition, and this in 3.0V or less
When battery with two side terminals can be poor, the pressure difference highlighted also can be bigger), shelve 30min.According to test result, make respectively
In voltage-time curve, discharge process during being shelved after battery voltage-capacity curve during the charging process, charging
Voltage-time curve during being shelved after voltage-capacity curve, electric discharge.According to the curve drawn out, setting is wherein for one
Standard curve is rejected and the poor unqualified battery of standard curve registration.Specifically: identical capacity in charging process can be rejected
Lower voltage difference (compared with data in standard curve) is greater than the battery of 15mV (± 15mV), rejects in discharge process under identical capacity
Voltage difference (compared with data in standard curve) is greater than the battery of 25mV (± 25mV).
To remaining spec battery carry out following step 4) operation.
4) SOC of battery is adjusted by a certain value to 10~20% ranges, this implementation with the standard charging current of 0.52A
Example is specially 15%, shelves 2h so that voltage stabilization, the voltage V of battery after record is shelved1.Then using the battery at this
The sustained ceiling current 4A that (15%SOC) allows under SOC discharges 10s (second), records the voltage V of 10s2, calculate battery and exist
DC internal resistance R1 under SOC (15%SOC) state.
It is discharged by battery discharge to 2.75V, specifically: being placed battery to 2.75V with the electric current of 1.3A with standard.Then
It is in a manner of standard charging that battery is fully charged, then the SOC of battery will be adjusted to certain in 80~90% ranges with standard electric discharge
One value (this example 85%) shelves 2h, and the voltage V3 of battery, is then allowed at the SOC with battery after record is shelved
Sustained ceiling current 8A electric discharge 10s, records the voltage V of 10s4, calculate DC internal resistance R of the battery under the SOC state2。
To the R for all batteries that test obtains1It averages, obtains average value R1'；All electricity that test is obtained simultaneously
The R in pond2It averages, obtains average value R2'.R is made respectively1And R2Normal distribution curve, then reject R1With R1' difference exist
Unqualified battery outside claimed range, and also reject R2With R2' unqualified battery of the difference outside claimed range.Specifically: both
Reject R1With R1' difference be greater than 0.5m Ω (± 0.5m Ω) battery, and reject R2With R2' difference be greater than 0.5m Ω (± 0.5m
Battery Ω).
To remaining spec battery carry out following step 4) operation.
5) with standard charging current that battery is fully charged, 2h is shelved under normal temperature environment so that voltage stabilization, and measures battery
Voltage V after shelving 2h5.Then battery is transferred in 45 DEG C of hot environment storehouse and shelves 7day, take out electricity from environment storehouse later
2h is shelved under normal temperature environment in pond, measures the voltage V of battery at this time6。
Compare V5And V6, reject V5And V6Battery of the difference outside claimed range.
Specifically: rejecting V5And V6Difference be greater than 30mV battery (V5-V6The not qualified battery of≤30mV).
To remaining spec battery carry out following step 5) operation.
6) according to the specification of battery, a standard electric discharge is carried out to battery, records the discharge capacity C of battery2；So
It carries out a standard charging again afterwards and standard discharges to obtain the discharge capacity of battery, record the capacity C of battery3。
Compare C2And C1, while comparing C2And C3Compare, rejects C2With C1Unqualified battery of the ratio outside claimed range, together
When also reject C2And C3Unqualified battery of the ratio outside claimed range.Specifically: rejecting C2With C1Ratio less than 98%
Battery rejects C2With C3Battery of the ratio outside 98~102% ranges.
Above-described embodiment is only the technical concepts and features for illustrating the application, and its object is to allow people that can understand this Shen
Content please is simultaneously implemented accordingly, and the protection scope of the application can not be limited with this.It is all according to the application main technical schemes
The equivalent transformation or modification that Spirit Essence is done should all be covered within the scope of protection of this application.
Claims (9)
1. a kind of lithium battery Conformance Assessment test method, which is characterized in that this method includes the following steps sequentially carried out:
1) certain amount is randomly selected from batch battery, according to the weight of battery and internal resistance requirement, rejects unqualified battery；
2) under normal temperature environment, according to the specification of battery, standard charging is carried out to spec battery in step 1) and standard is put
Electricity measures capacity C of each battery under normal temperature environment1And ENERGY E1, according to the discharge capacity and energy requirement of battery, reject
Unqualified battery；
3) with electric current I1To the end of charge voltage of spec battery constant-current charge in step 2) to battery, time t is shelved1, then with
Electric current I2To the discharge cut-off voltage of battery constant-current discharge to battery, time t is shelved2；
According to test result, the electricity during shelving after battery voltage-capacity curve during the charging process, charging is made respectively
Voltage-time curve during being shelved after voltage-capacity curve, electric discharge in pressure-time graph, discharge process, reject with
The poor unqualified battery of standard curve registration；
4) SOC of spec battery in step 3) is adjusted to 10~20% with standard charging current, is shelved 2 hours, record is shelved
After battery voltage V1, the sustained ceiling current I that is then allowed at the SOC using the battery3Electric discharge 10 seconds, record the
10 seconds voltage V2, calculate DC internal resistance R of the battery under the SOC state1；
Battery capacity is vented with standard discharge system, is later adjusted the SOC of battery to 80~90% with standard charging current,
It shelves 2 hours, the voltage V of battery after record is shelved3, the sustained ceiling current I that is then allowed at the SOC with battery4It puts
Electricity 10 seconds, the 10th second voltage V of record4, calculate DC internal resistance R of the battery under the SOC state2；
Calculate the DC internal resistance R of all batteries1Average value R1', calculate the DC internal resistance R of all batteries2's
Average value R2', by the DC internal resistance R of each battery1With the average value R1' compare, it will be in the direct current of each battery
Hinder R2With the average value R2' compare, reject R1With R1' unqualified battery of the difference outside claimed range, while rejecting R2With R2’
Unqualified battery of the difference outside claimed range；
5) with standard charging current that spec battery in step 4) is fully charged, it is shelved under normal temperature environment 2 hours, measures the electricity of battery
Press V5；
Battery is transferred in high temperature T environment storehouse and shelves a period of time, battery is taken out from the environment storehouse and shelves 2 under normal temperature environment
Hour, measure the voltage V of battery6；
Compare V5And V6, reject V5With V6Unqualified battery of the difference outside claimed range；
6) according to the specification of battery, standard charge and discharge are carried out to spec battery in step 5), test capacity records battery
Discharge capacity C2；Then a standard cycle is carried out again, records the capacity C of battery3；
Compare C2And C1, while comparing C2And C3Compare, rejects C2With C1Unqualified battery of the ratio outside claimed range rejects C2
With C3Unqualified battery of the ratio outside claimed range.
2. lithium battery Conformance Assessment test method according to claim 1, which is characterized in that the I1For the rule of battery
Standard charging current as defined in lattice book.
3. lithium battery Conformance Assessment test method according to claim 2, which is characterized in that in the step 3),
With electric current I1After spec battery constant-current charge to the end of charge voltage of battery in step 2), then with the end of charge voltage
To battery constant-voltage charge, during aforementioned constant-voltage charge, when charging current is reduced to 0.25I1When stop charging, shelve institute
State time t1。
4. lithium battery Conformance Assessment test method according to claim 1, which is characterized in that in the step 2),
Reject E1It is greater than the battery of 25mAh with the difference of rated energy, rejects C1It is greater than the battery of 0.05Wh with the difference of rated energy.
5. lithium battery Conformance Assessment test method according to claim 1, which is characterized in that in the step 3),
Compared with selected standard curve, voltage difference is greater than the battery of 15mV under identical capacity in rejecting charging process, and rejecting was discharged
Voltage difference is greater than the battery of 25mV under identical capacity in journey.
6. lithium battery Conformance Assessment test method according to claim 1, which is characterized in that in the step 4),
Reject R1With R1' difference be greater than 0.5m Ω battery, reject R2With R2' difference be greater than 0.5m Ω battery.
7. lithium battery Conformance Assessment test method according to claim 1, which is characterized in that in the step 5),
Reject V5With V5Difference be greater than 30mV battery.
8. lithium battery Conformance Assessment test method according to claim 1, which is characterized in that in the step 6),
Reject C2With C1Ratio be lower than 98% battery, reject C2With C3Battery of the ratio outside 98~102% ranges.
9. lithium battery Conformance Assessment test method according to claim 1, which is characterized in that the t1And t2It is
30min, the I2Standard discharge current as defined in specifications for battery.
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| CN111282853A (en) * | 2020-02-28 | 2020-06-16 | 合肥国轩高科动力能源有限公司 | Screening method of lithium ion battery |
| CN111554990A (en) * | 2020-05-13 | 2020-08-18 | 惠州亿纬锂能股份有限公司 | Screening method for battery consistency and battery module |
| CN112505557A (en) * | 2020-11-16 | 2021-03-16 | 东风汽车集团有限公司 | Method for dynamically evaluating consistency of battery cells |
| CN112666471A (en) * | 2020-12-28 | 2021-04-16 | 中天储能科技有限公司 | Lithium ion battery consistency sorting method and sorting system |
| CN113219354A (en) * | 2021-04-08 | 2021-08-06 | 刘迪 | Test method of fast-charging solid polymer lithium ion battery |
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| CN111282853A (en) * | 2020-02-28 | 2020-06-16 | 合肥国轩高科动力能源有限公司 | Screening method of lithium ion battery |
| CN111554990A (en) * | 2020-05-13 | 2020-08-18 | 惠州亿纬锂能股份有限公司 | Screening method for battery consistency and battery module |
| CN112505557A (en) * | 2020-11-16 | 2021-03-16 | 东风汽车集团有限公司 | Method for dynamically evaluating consistency of battery cells |
| CN112666471A (en) * | 2020-12-28 | 2021-04-16 | 中天储能科技有限公司 | Lithium ion battery consistency sorting method and sorting system |
| CN113219354A (en) * | 2021-04-08 | 2021-08-06 | 刘迪 | Test method of fast-charging solid polymer lithium ion battery |
| CN113219354B (en) * | 2021-04-08 | 2024-04-12 | 海口安博尔能源技术开发有限公司 | Test method of fast-charge solid polymer lithium ion battery |
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