CN110221226A - The test method and test macro of battery pack Capacity uniformity - Google Patents
The test method and test macro of battery pack Capacity uniformity Download PDFInfo
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- CN110221226A CN110221226A CN201910362022.5A CN201910362022A CN110221226A CN 110221226 A CN110221226 A CN 110221226A CN 201910362022 A CN201910362022 A CN 201910362022A CN 110221226 A CN110221226 A CN 110221226A
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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
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The present invention relates to battery technology fields, provide the test method and test macro of a kind of battery pack Capacity uniformity.In the case that the test method of battery pack Capacity uniformity of the present invention includes: that the voltage of any battery core in battery pack reaches preset charged blanking voltage, stop charging, and acquires the charging voltage of each battery core of the first predetermined time before stopping charging；In the case where the voltage of any battery core reaches default discharge cut-off voltage, stop electric discharge, and acquires the discharge voltage of each battery core of the second predetermined time before stopping electric discharge；Charge and discharge voltage based on each battery core calculates separately the charge cutoff voltage offset and discharge cut-off voltage offset of battery pack；And in the case where charging, discharge cut-off voltage offset belong to default fraction defective range, determine that the Capacity uniformity of battery pack is qualified.The present invention can accurately test the consistency of battery inclusion quantity, to improve the following cycle service life of entire battery pack.
Description
Technical field
The present invention relates to battery technology field, in particular to the test method of a kind of battery pack Capacity uniformity and test system
System.
Background technique
Capacity is important one of the performance indicator of power battery, and single battery core will do it volume test in factory, due to material
Material, technique and environment it is inconsistent, cause battery core capacity variant.It therefore, all can be according to certain control before single factory
Line carries out stepping to battery core capacity, and the battery core of same shelves can just be assembled into a battery pack, the battery of battery core good capacitance consistency
The packet following cycle service life is longer than the battery pack of consistency difference.
Standing crop electricity production pond contains weight testing method and is generally based on the progress of ampere-hour integral formula, but it is to battery
The consistency of inclusion quantity is tested.Urgently demand one kind can accurately measure battery pack Capacity uniformity at present as a result,
Method, to improve the following cycle service life of entire battery pack.
Summary of the invention
In view of this, the present invention is directed to propose a kind of test method of battery pack Capacity uniformity, accurately to test battery
The consistency of inclusion quantity, so that the following cycle service life of entire battery pack can be improved.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of test method of battery pack Capacity uniformity includes: that the voltage of any battery core in the battery pack reaches
In the case where preset charged blanking voltage, stopping charges to the battery pack, and acquires first default before stopping charging
The charging voltage U (i) of each battery core in battery pack described in momentCharging；The voltage of any battery core in the battery pack reaches
In the case where default discharge cut-off voltage, stopping discharges to the battery pack, and acquires second default before stopping electric discharge
The discharge voltage U (i) of each battery core in battery pack described in momentElectric discharge；Charging voltage U (i) based on each battery coreCharging、
Discharge voltage U (i)Electric discharge, calculate separately the charge cutoff voltage shifted by delta V of the battery packCharge cutoffIt is deviated with discharge cut-off voltage
ΔVElectric discharge cut-off；And in the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offMeet the
In the case where one condition for consistence, determine that the Capacity uniformity of the battery pack is qualified, wherein first condition for consistence is
The charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offBelong to default fraction defective range.
Further, the test method further include: from the charging voltage and discharge voltage of each battery core, respectively
Filter out the maximum value U of the charging voltagemaxWith the minimum value U of the discharge voltagemin；The charging voltage is determined respectively
Maximum value UmaxWith the minimum value U of the discharge voltageminThe mark of corresponding battery core；And the maximum value in the charging voltage
UmaxThe mark and the minimum value U of the discharge voltage of corresponding battery coreminThe mark of corresponding battery core meets the second consistency item
In the case where part, determine that the Capacity uniformity of the battery pack is qualified, wherein second condition for consistence is the charging electricity
The maximum value U of pressuremaxThe mark and the minimum value U of the discharge voltage of corresponding battery coreminCorresponding battery core is identified as difference
Mark.
Further, the test method further include: the discharge time for acquiring the battery pack, in putting for the battery pack
In the case that the electric time meets third condition for consistence, determine that the Capacity uniformity of the battery pack is qualified, wherein the third
Condition for consistence is the discharge time of the battery pack to be greater than default discharge time, the default discharge time and the battery pack
Discharge current is related.
Further, the default fraction defective range includes: the first default fraction defective range, the second default fraction defective range
And third presets fraction defective range, wherein it is default that the arbitrary value within the scope of the first default fraction defective is respectively less than described second
Arbitrary value within the scope of fraction defective, the arbitrary value within the scope of the second default fraction defective are respectively less than the third and preset fraction defective
Arbitrary value in range, the test method further include, in the case where determining the Capacity uniformity qualification of the battery pack, root
The Capacity uniformity grade of the battery pack is determined according to following methods: in the charge cutoff voltage shifted by delta VCharge cutoffAnd it is described
Discharge cut-off voltage shifted by delta VElectric discharge cut-offIn the case where belonging to the described first default fraction defective range, the battery pack is determined
Capacity uniformity reaches strong consistency；In the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta
VElectric discharge cut-offIn the case where belonging to the described second default fraction defective range, determine that the Capacity uniformity of the battery pack reaches secondary strong
Consistency；And in the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offBelong to institute
In the case where stating the default fraction defective range of third, determine that the Capacity uniformity of the battery pack reaches weak consistency.
Further, the charging voltage U (i) based on each battery coreCharging, discharge voltage U (i)Electric discharge, calculate separately
The charge cutoff voltage shifted by delta V of the battery packCharge cutoffWith discharge cut-off voltage shifted by delta VElectric discharge cut-offIt include: from each electricity
In the charging voltage and discharge voltage of core, the maximum value U of the charging voltage is filtered out respectivelymaxMost with the discharge voltage
Small value Umin；Charging voltage U (i) based on each battery coreCharging, discharge voltage U (i)Electric discharge, the charging voltage maximum value
UmaxWith the minimum value U of the discharge voltagemin, the charge cutoff voltage shifted by delta V is calculatedCharge cutoffAnd the electric discharge is cut
Only variation Δ VElectric discharge cut-offMeet following equation respectively: Its
In, U (i)ChargingFor the charging voltage of i-th of battery core, U (i)Electric dischargeIt is the battery pack for the discharge voltage and N of i-th battery core
In battery core number.
Compared with the existing technology, the test method of battery pack Capacity uniformity of the present invention has the advantage that
(1) firstly, stopping in the case that the voltage of any battery core in battery pack reaches default charge and discharge blanking voltage
Charge and discharge only are carried out to the battery pack, and acquire each battery core in battery pack described in the predetermined time before stopping charge and discharge
Charge and discharge voltage；Then, the charge and discharge voltage based on each battery core, calculates separately the charge cutoff of the battery pack
Variation and discharge cut-off voltage offset；Finally, in charge cutoff voltage offset and discharge cut-off voltage offset
In the case where meeting condition for consistence, determine that the Capacity uniformity of the battery pack is qualified.The test method can be prevented in battery
Overcharge or over-discharge in the case where tested, and then avoid influence battery pack service life, also, based on charge and discharge cut-off
Variation can accurately, intuitively reflect whether battery pack Capacity uniformity is qualified, so that the subsequent of entire battery pack can be improved
Cycle life.
(2) maximum value, the minimum value of discharge voltage of the charging voltage based on each battery core, determine its correspondence respectively
Battery core mark, the mark of the battery core corresponding to the two is different and the charge cutoff voltage offset and the electric discharge end
In the case that variation meets condition for consistence, determine that the Capacity uniformity of the battery pack is qualified.The test method can arrange
It happens except the charging voltage of same battery core is maximum and discharge voltage is the smallest, contains so as to more preparatively test battery
The consistency of amount.
(3) pass through the offset of charge and discharge blanking voltage and the first default fraction defective range, the second default fraction defective range and the
The comparison result of three default fraction defective ranges, it may be determined that the Capacity uniformity grade of the battery pack, it is same so as to belong to
The battery core of grade is assembled in a battery pack, further to improve the following cycle service life of entire battery pack.
Another object of the present invention is to propose a kind of test macro of battery pack Capacity uniformity, accurately to test battery
The consistency of inclusion quantity, so that the following cycle service life of entire battery pack can be improved.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of test macro of battery pack Capacity uniformity includes: control device, for performing the following operations: in the electricity
In the case that the voltage of any battery core in the packet of pond reaches preset charged blanking voltage, stopping charges to the battery pack；
Or the voltage of any battery core in the battery pack stops to the battery in the case where reach default discharge cut-off voltage
Packet discharges, charging voltage acquisition device, each in battery pack described in the first predetermined time before stopping charging for acquiring
The charging voltage U (i) of a battery coreCharging；Discharge voltage acquisition device, for acquiring described in the second predetermined time before stopping electric discharge
The discharge voltage U (i) of each battery core in battery packElectric discharge；Computing device, the charging voltage U (i) based on each battery coreCharging、
Discharge voltage U (i)Electric discharge, calculate separately the charge cutoff voltage shifted by delta V of the battery packCharge cutoffIt is deviated with discharge cut-off voltage
ΔVElectric discharge cut-off；And consistency qualification determining device, in the charge cutoff voltage shifted by delta VCharge cutoffAnd the electric discharge cut-off electricity
Press shifted by delta VElectric discharge cut-offIn the case where meeting the first condition for consistence, determine that the Capacity uniformity of the battery pack is qualified, wherein
First condition for consistence is the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-off
Belong to default fraction defective range.
Further, the test macro further include: screening plant for the charging voltage from each battery core and is put
In piezoelectric voltage, the maximum value U of the charging voltage is filtered out respectivelymaxWith the minimum value U of the discharge voltagemin；And battery core
Determination unit is identified, for determining the maximum value U of the charging voltage respectivelymaxWith the minimum value U of the discharge voltageminIt is corresponding
Battery core mark, the consistency qualification determining device is also used to, in the maximum value U of the charging voltagemaxCorresponding battery core
Mark and the minimum value U of the discharge voltageminIn the case that the mark of corresponding battery core meets the second condition for consistence, really
The Capacity uniformity of the fixed battery pack is qualified, wherein second condition for consistence is the maximum value U of the charging voltagemax
The mark and the minimum value U of the discharge voltage of corresponding battery coreminCorresponding battery core is identified as different marks.
Further, the test macro further include: time acquisition device, when for acquiring the electric discharge of the battery pack
Between, the consistency qualification determining device is also used to, and the feelings of third condition for consistence are met in the discharge time of the battery pack
Under condition, determine that the Capacity uniformity of the battery pack is qualified, wherein the third condition for consistence is the electric discharge of the battery pack
Time is greater than default discharge time, and the default discharge time is related to the discharge current of the battery pack.
Further, the default fraction defective range includes: the first default fraction defective range, the second default fraction defective range
And third presets fraction defective range, wherein it is default that the arbitrary value within the scope of the first default fraction defective is respectively less than described second
Arbitrary value within the scope of fraction defective, the arbitrary value within the scope of the second default fraction defective are respectively less than the third and preset fraction defective
Arbitrary value in range, the test macro further include consistency grade determining device, for performing the following operations in one
Person: in the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offIt is pre- to belong to described first
If in the case where fraction defective range, determining that the Capacity uniformity of the battery pack reaches strong consistency；In the charge cutoff electricity
Press shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offThe case where belonging to the described second default fraction defective range
Under, determine that the Capacity uniformity of the battery pack reaches time strong consistency；And in the charge cutoff voltage shifted by delta VCharge cutoff
And the discharge cut-off voltage shifted by delta VElectric discharge cut-offIn the case where belonging to the default fraction defective range of the third, the electricity is determined
The Capacity uniformity of Chi Bao reaches weak consistency.
The test method of the test macro of the battery pack Capacity uniformity and above-mentioned battery pack Capacity uniformity relative to
Advantage possessed by the prior art is identical, and details are not described herein.
Another object of the present invention is to propose a kind of machine readable storage medium, accurately to test the one of battery inclusion quantity
Cause property, so that the following cycle service life of entire battery pack can be improved.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of machine readable storage medium is stored with instruction on the machine readable storage medium, which is used for so that machine
Device executes the test method of above-mentioned battery pack Capacity uniformity.
The test method of the machine readable storage medium and above-mentioned battery pack Capacity uniformity institute compared with the existing technology
Have the advantage that identical, details are not described herein.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies mode and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the active volume of battery pack described in embodiment of the present invention；
Fig. 2 is the flow chart of the test method of battery pack Capacity uniformity described in embodiment of the present invention；
Fig. 3 is the flow chart of the test process of battery pack Capacity uniformity described in embodiment of the present invention；
Fig. 4 is the scatter plot of the charge and discharge blanking voltage of each battery core in battery pack described in embodiment of the present invention；
And
Fig. 5 is the structure chart of the test macro of battery pack Capacity uniformity described in embodiment of the present invention.
Description of symbols:
10 control device, 20 charging voltage acquisition device
30 discharge voltage acquisition device, 40 computing device
50 consistency qualification determining device, 100 battery pack
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can
To be combined with each other.
The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiment.
Before introducing technical solution of the present invention, the pass once between battery core capacity and charge and discharge blanking voltage is described
System.Assuming that single battery core capacity is fixed value, charge and discharge blanking voltage and Capacity uniformity determine the active volume of battery pack
(as shown in Figure 1).The active volume of the offset and battery pack of the charge and discharge blanking voltage of each battery core is in negative inside battery pack
Related: the offset of charge and discharge blanking voltage is bigger, and the active volume of battery pack is with regard to smaller；The offset of charge and discharge blanking voltage is smaller,
The active volume of battery pack is bigger.Therefore, it can intuitively reflect very much battery with the offset at charge and discharge blanking voltage moment
The consistency of inclusion quantity.
Fig. 2 is the flow chart of the test method of battery pack Capacity uniformity described in embodiment of the present invention.Such as Fig. 2 institute
Show, the test method may include following steps:
In the case that the voltage of step S201, any battery core in the battery pack reach preset charged blanking voltage,
Stopping charges to the battery pack, and acquires each battery core in battery pack described in the first predetermined time before stopping charging
Charging voltage U (i)Charging。
For example, the mode that constant-current charge can be used charges to the battery pack, due to each battery core in battery pack
Capacity otherness, be not that all battery cores in synchronization reach preset charged blanking voltage, as long as therefore wherein having one
The charging voltage of battery core reaches preset charged blanking voltage, can stop charging to battery pack.Wherein, the preset charged
Blanking voltage is less than the maximum charge blanking voltage allowed, and the setting of the preset charged blanking voltage can prevent appointing in battery pack
One battery core is overcharged, to guarantee the safety of battery pack.
In the present embodiment, the first 1 second charging voltage U for acquiring each battery core in the battery pack that charges can stopped
(i)Charging。
In the case that the voltage of step S202, any battery core in the battery pack reach default discharge cut-off voltage,
Stopping discharges to the battery pack, and acquires each battery core in battery pack described in the second predetermined time before stopping electric discharge
Discharge voltage U (i)Electric discharge。
For example, can be after stopping to battery pack charging, (standing half an hour may make battery pack after standing half an hour
In the voltage of each battery core become stable, after stablizing, just execute other operations), using the side of constant-current discharge (for example, 1C)
Formula discharges to the battery pack.It is not that all battery cores exist due to the otherness of the capacity of each battery core in battery pack
Synchronization reaches default discharge cut-off voltage, as long as therefore wherein having the discharge voltage of a battery core to reach default electric discharge cut-off electricity
Pressure, can stop discharging to battery pack.Wherein, the default discharge cut-off voltage is greater than the minimum charge cutoff electricity allowed
The setting of pressure, the default discharge cut-off voltage can prevent any battery core in battery pack to be excessively discharged, to guarantee battery pack
Safety.
In the present embodiment, the first 1 second discharge voltage U for acquiring each battery core in the battery pack that discharges can stopped
(i)Electric discharge。
Step S203, the charging voltage U (i) based on each battery coreCharging, discharge voltage U (i)Electric discharge, calculate separately described
The charge cutoff voltage shifted by delta V of battery packCharge cutoffWith discharge cut-off voltage shifted by delta VElectric discharge cut-off。
It can be from the charging voltage U (i) of each battery coreChargingWith discharge voltage U (i)Electric dischargeIn, the charging is filtered out respectively
The maximum value U of voltagemaxWith the minimum value U of the discharge voltagemin.Wherein, the charge cutoff voltage shifted by delta VCharge cutoffWith institute
State the average value of the charging voltage of each battery coreThe maximum of the charging voltage of each battery core
Value UmaxIt is associated；The discharge cut-off voltage shifted by delta VElectric discharge cut-offWith the average value of the discharge voltage of each battery coreThe minimum value U of the discharge voltage of each battery coreminIt is associated.
Specifically, the charge cutoff voltage shifted by delta VCharge cutoffMeet equationThe discharge cut-off voltage shifted by delta VElectric discharge cut-offMeet equationWherein, U (i)ChargingFor the charging voltage of i-th of battery core, U (i)Electric dischargeIt is i-th
The discharge voltage and N of a battery core are the number of the battery core in the battery pack.
Step S204, in the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offIt is full
In the case where the first condition for consistence of foot, determine that the Capacity uniformity of the battery pack is qualified.
Wherein, first condition for consistence is the charge cutoff voltage shifted by delta VCharge cutoffAnd the electric discharge cut-off electricity
Press shifted by delta VElectric discharge cut-offBelong to default fraction defective range.The default fraction defective range can be [0,6.68%] section, when described
Charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offWhen belonging to [0,6.68%] section, determine
The Capacity uniformity of the battery pack is qualified.
The test method can prevent from being tested in the case where over-charging of battery or over-discharge, and then avoid influencing battery pack
Service life, also, based on charge and discharge blanking voltage offset can accurately, intuitively reflect whether battery pack Capacity uniformity closes
Lattice, so that the following cycle service life of entire battery pack can be improved.
In a preferred embodiment, in addition to requiring the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage
Shifted by delta VElectric discharge cut-offMeet except the first condition for consistence, also settable second condition for consistence, so that each battery core is filled
The maximum value U of piezoelectric voltagemaxWith the minimum value U of discharge voltageminIn the case where meeting second condition for consistence, institute is just determined
The Capacity uniformity for stating battery pack is qualified.
Specifically, the test method may also include that from the charging voltage and discharge voltage of each battery core, respectively
Filter out the maximum value U of the charging voltagemaxWith the minimum value U of the discharge voltagemin；The charging voltage is determined respectively
Maximum value UmaxWith the minimum value U of the discharge voltageminThe mark of corresponding battery core；And the maximum value in the charging voltage
UmaxThe mark and the minimum value U of the discharge voltage of corresponding battery coreminThe mark of corresponding battery core meets the second consistency item
In the case where part, determine that the Capacity uniformity of the battery pack is qualified.Wherein, second condition for consistence is the charging electricity
The maximum value U of pressuremaxThe mark and the minimum value U of the discharge voltage of corresponding battery coreminCorresponding battery core is identified as difference
Mark.
For example, each battery core can be numbered according to position of each battery core in battery pack, the number and electricity of battery core
The position of core corresponds, correspondingly, charging voltage acquisition device (or discharge voltage acquisition device) each battery core collected
Charging (or electric discharge) voltage also corresponded with the number of battery core, position.Firstly, each with different numbers based on acquisition
The charging voltage signal of a battery core, screening obtain the maximum value U of charging voltagemax, discharge voltage minimum value Umin；Then, really
Determine Umax、UminThe number of corresponding battery core illustrates U if two numbers are differentmax、UminCorresponding battery core is in different positions
The battery core set.In the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offMeet the 1st
Cause property condition and Umax、UminIn the case that corresponding battery core is the battery core in different location, the appearance of the battery pack is just determined
It is qualified to measure consistency.The charging voltage that the test method can exclude same battery core is maximum and discharge voltage is the smallest happens,
So as to more preparatively test the consistency of battery inclusion quantity.
In more preferred embodiment, in addition to requiring the charge cutoff voltage shifted by delta VCharge cutoffAnd the electric discharge is cut
Only variation Δ VElectric discharge cut-offMeet the maximum value U of the first condition for consistence and the charging voltagemaxThe mark of corresponding battery core
With the minimum value U of the discharge voltageminThe mark of corresponding battery core meets except the second condition for consistence, also settable third
Condition for consistence, so that just determining the battery in the case that the discharge time of the battery pack meets third condition for consistence
The Capacity uniformity of packet is qualified.
Specifically, the test method may also include that the discharge time for acquiring the battery pack, in putting for the battery pack
In the case that the electric time meets third condition for consistence, determine that the Capacity uniformity of the battery pack is qualified, wherein the third
Condition for consistence is the discharge time of the battery pack to be greater than default discharge time, the default discharge time and the battery pack
Discharge current is related.For example, the product of the discharge current of the default discharge time and the battery pack is preset appearance
Magnitude, in the case where the discharge current of the battery pack is 1C, the settable default discharge time is 1 hour；When institute
When the discharge current for stating battery pack is 3/C, the settable default discharge time is 3 hours.Thus, it is ensured that in each battery core
Capacity be greater than the preset capability value.Therefore in the charge cutoff voltage shifted by delta VCharge cutoffAnd the electric discharge cut-off
Variation Δ VElectric discharge cut-offMeet the maximum value U of the first condition for consistence, the charging voltagemaxThe mark of corresponding battery core and institute
State the minimum value U of discharge voltageminWhen the mark of corresponding battery core meets the second condition for consistence and the electric discharge of the battery pack
Between be greater than default discharge time in the case where, just determine the Capacity uniformity qualification of the battery pack.
In the case where determining the Capacity uniformity qualification of the battery pack, further electricity can also be ended according to charge and discharge
The numerical value of pressure offset divides the grade of the Capacity uniformity of the battery pack.
Specifically, the default fraction defective range can include: the first default fraction defective range, the second default fraction defective range
And third presets fraction defective range, wherein it is default that the arbitrary value within the scope of the first default fraction defective is respectively less than described second
Arbitrary value within the scope of fraction defective, the arbitrary value within the scope of the second default fraction defective are respectively less than the third and preset fraction defective
Arbitrary value in range.For example, for the default fraction defective range for for [0,6.68%] section, described first is preset not
Yield range can be [0,2%] section, the second default fraction defective range can for (2%, 4%] section, the third is default
Fraction defective range can for (4%, 6.68%] section.
The test method may also include, determine the battery pack Capacity uniformity it is qualified in the case where, according to
Lower method determines the Capacity uniformity grade of the battery pack: in the charge cutoff voltage shifted by delta VCharge cutoffAnd the electric discharge
Blanking voltage shifted by delta VElectric discharge cut-offIn the case where belonging to the described first default fraction defective range, the capacity of the battery pack is determined
Consistency reaches strong consistency；In the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-off
In the case where belonging to the described second default fraction defective range, determine that the Capacity uniformity of the battery pack reaches time strongly consistent
Property；And in the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offBelong to described
In the case where three default fraction defective ranges, determine that the Capacity uniformity of the battery pack reaches weak consistency.
Pass through the offset of charge and discharge blanking voltage and the first default fraction defective range, the second default fraction defective range and third
The comparison result of default fraction defective range, it may be determined that the Capacity uniformity grade of the battery pack, so as to belong to first-class
The battery core of grade is assembled in a battery pack, further to improve the following cycle service life of entire battery pack.
In addition, in a preferred embodiment, the test method may also include that filling to each battery core in the battery pack
Piezoelectric voltage U (i)Charging, discharge voltage U (i)Electric discharge, the battery pack charge cutoff voltage shifted by delta VCharge cutoff, discharge cut-off voltage
Shifted by delta VElectric discharge cut-offAnd the grade of Capacity uniformity is shown, so that relevant staff intuitively identifies the battery pack
In each battery core specific data and the battery pack Capacity uniformity concrete condition.For example, terminal device exhibition can be passed through
Show above data, the terminal device may include mobile phone, notebook or computer etc..
Specifically, by taking the battery pack that 32 battery cores of rated capacity 100AH form as an example, to the appearance for testing the battery pack
The process of amount consistency is explained in detail and is illustrated.
As shown in figure 3, the process for testing the Capacity uniformity of above-mentioned battery pack is as follows:
Step S301 charges to the battery pack, and the voltage of any battery core in the battery pack reaches pre-
If in the case where charge cutoff voltage, stopping charges to the battery pack.
Step S302, acquisition stop the charging voltage U (i) of 32 battery cores in the battery pack before charging 1 secondCharging。
Specifically, it for charging process, is charged by way of constant-current charge to above-mentioned battery pack, herewith by filling
Piezoelectric voltage acquisition device acquires the voltage of 32 battery cores, cuts when the voltage of any one battery core in 32 battery cores reaches preset charged
Only when voltage, control stops charging to the battery pack, and records the charging voltage of each battery core before stopping charging 1 second, such as
Shown in table 1.
| Battery core numbers (or position) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Charging voltage | 4.2820 | 4.2870 | 4.2920 | 4.2880 | 4.2870 | 4.2850 | 4.2860 | 4.2870 |
| Battery core numbers (or position) | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| Charging voltage | 4.2910 | 4.2920 | 4.2800 | 4.2950 | 4.2820 | 4.2840 | 4.2900 | 4.2820 |
| Battery core numbers (or position) | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| Charging voltage | 4.2840 | 4.2810 | 4.2930 | 4.2850 | 4.2840 | 4.2840 | 4.2850 | 4.2830 |
| Battery core numbers (or position) | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 |
| Charging voltage | 4.2800 | 4.2910 | 4.2840 | 4.2940 | 4.2930 | 4.2820 | 4.2890 | 4.2920 |
The charging voltage of each battery core with different numbers in 1 battery pack of table
Step S303 discharges to the battery pack, and the voltage of any battery core in the battery pack reaches pre-
If in the case where charge cutoff voltage, stopping charges to the battery pack, at the same time, the electric discharge of the battery pack is acquired
Time T.
Step S304, acquisition stop the charging voltage U (i) of 32 battery cores in the battery pack before discharging 1 secondCharging。
Specifically, it after standing half an hour, is discharged by way of constant-current discharge (such as 1C) above-mentioned battery pack, together
This acquires the voltage of 32 battery cores by discharge voltage acquisition device, when the voltage of any one battery core in 32 battery cores reaches pre-
If when discharge cut-off voltage, control stops discharging to the battery pack, and records the electric discharge of each battery core before stopping electric discharge 1 second
Voltage, as shown in table 2.
| Battery core numbers (or position) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Discharge voltage | 3.0120 | 3.0310 | 2.9830 | 3.0200 | 2.9810 | 2.9980 | 2.9770 | 3.0270 |
| Battery core numbers (or position) | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| Discharge voltage | 3.0090 | 2.9940 | 2.9970 | 2.7750 | 2.9550 | 3.0270 | 3.0570 | 3.0160 |
| Battery core numbers (or position) | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| Discharge voltage | 3.0280 | 3.0500 | 2.9500 | 2.9970 | 3.0790 | 3.1250 | 3.0800 | 3.0740 |
| Battery core numbers (or position) | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 |
| Discharge voltage | 3.0380 | 3.0500 | 3.0910 | 3.1310 | 3.0800 | 3.0640 | 3.0160 | 3.0500 |
The discharge voltage of each battery core with different numbers in 2 battery pack of table
Step S305 filters out the maximum value of the charging voltage from the charge and discharge voltage of 32 battery cores respectively
UmaxWith the minimum value U of the discharge voltagemin。
As shown in Table 1, the battery core (N that number is No. 12max=12) charging voltage is maximum, i.e., the described charging voltage is most
Big value Umax=4.2950.
As shown in Table 2, the battery core (N that number is No. 12min=12) discharge voltage is minimum, i.e., the described discharge voltage is most
Small value Umin=2.7750.
Step S306 determines the maximum value U of the charging voltage respectivelymaxWith the minimum value U of the discharge voltageminIt is corresponding
Battery core number Nmax、Nmin。
The maximum value U of the charging voltagemaxThe number of=4.2950 corresponding battery cores is No. 12, the discharge voltage
Minimum value UminThe number of corresponding battery core is also No. 12.
Step S307, the charging voltage U (i) based on 32 battery coresCharging, discharge voltage U (i)Electric discharge, the charging voltage
Maximum value UmaxWith the minimum value U of the discharge voltagemin, the charge cutoff voltage shifted by delta V is calculatedCharge cutoffAnd institute
State discharge cut-off voltage shifted by delta VElectric discharge cut-off。
Data based on table 1 can be calculated,
Data based on table 2 can be calculated,
Step S308 judges the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-off
Whether satisfaction belongs to default fraction defective range, if satisfied, thening follow the steps S309；Otherwise, step S313 is executed.
For example, the default fraction defective range can be [0,6.68%] section.
Step S309 judges the number N of battery coremax、NminIt is whether identical, if they are the same, then follow the steps S310；Otherwise, it holds
Row step S313.
Step S310, judges whether the discharge time T of the battery pack is greater than default discharge time, if so, executing step
Rapid S311；Otherwise, step 313 is executed.
For example, the default discharge time can be 1 hour when discharge current is 1C；When discharge current is 3/C, institute
Stating default discharge time can be 3 hours.
Step S311 determines that the Capacity uniformity of the battery pack is qualified.
Step S312, according to the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-off
Numerical value determine the battery pack Capacity uniformity grade.
In Δ VCharge cutoff、ΔVElectric discharge cut-offWhen belonging in [0,2%] section, determine the Capacity uniformity of the battery pack etc.
Grade is strong consistency；In Δ VCharge cutoff、ΔVElectric discharge cut-offBelong to (2%, 4%] in section when, determine the capacity one of the battery pack
The grade of cause property is time strong consistency；Or in Δ VCharge cutoff、ΔVElectric discharge cut-offBelong to (4%, 6.68%] in section when, determine institute
The grade for stating the Capacity uniformity of battery pack is weak consistency.
Step S313 determines that the Capacity uniformity of the battery pack is unqualified.
In addition, the charging voltage to 32 battery cores in table 1, table 2 and discharge voltage can also open up on the terminal device
Show.As shown in figure 4, using the data of charging voltage as X-axis, maximum value 4.3mV, unit 0.05mV；Data with discharge voltage are Y
Axis, minimum value 2.7mV, unit 0.05mV can supervise the concrete condition of each battery core convenient for relevant staff as a result,
Control.
Certainly, claimed technical solution of the invention is not limited to the suitable of each step defined by above-described embodiment
Sequence can also be executed according to other reasonable sequence of steps.For example, 32 electricity can first be handled after step S301, step S302
The data of core determine the maximum value U of discharge voltagemaxAnd its number of corresponding battery core, and obtain charge cutoff voltage shifted by delta
VCharge cutoffAnd then discharge battery pack, execute other steps.
In conclusion the voltage of any battery core of the present invention creatively first in battery pack reaches default charge and discharge
In the case where blanking voltage, stop carrying out charge and discharge to the battery pack, and acquire the predetermined time institute before stopping charge and discharge
State the charge and discharge voltage of each battery core in battery pack；Then, the charge and discharge voltage based on each battery core, calculates separately
The charge cutoff voltage offset and discharge cut-off voltage offset of the battery pack；Finally, the charge cutoff voltage offset and
In the case that the discharge cut-off voltage offset meets condition for consistence, determine that the Capacity uniformity of the battery pack is qualified.It should
Test method can prevent from being tested in the case where over-charging of battery or over-discharge, and then avoid influencing the service life of battery pack, also,
Based on charge and discharge blanking voltage offset can accurately, intuitively reflect whether battery pack Capacity uniformity qualified, so as to mention
The following cycle service life of high entire battery pack.
Correspondingly, as shown in figure 5, the embodiment of the present invention also provides a kind of test macro of battery pack Capacity uniformity, institute
State test macro can include: control device 10, charging voltage acquisition device 20, discharge voltage acquisition device 30, computing device 40
And consistency qualification determining device 50.
Wherein, the control device 10 is for performing the following operations: the voltage of any battery core in the battery pack 100
In the case where reaching preset charged blanking voltage, stopping charges to the battery pack 100；Or in the battery pack 100
In any battery core voltage reach default discharge cut-off voltage in the case where, stopping discharge the battery pack 100.
Wherein, the charging voltage acquisition device 20, for acquiring battery described in the first predetermined time before stopping charging
The charging voltage U (i) of each battery core in packet 100Charging.The discharge voltage acquisition device 30, before acquiring stopping electric discharge
The discharge voltage U (i) of each battery core in battery pack 100 described in second predetermined timeElectric discharge。
Wherein, the computing device 40, the charging voltage U (i) based on each battery coreCharging, discharge voltage U (i)Electric discharge,
Calculate separately the charge cutoff voltage shifted by delta V of the battery pack 100Charge cutoffWith discharge cut-off voltage shifted by delta VElectric discharge cut-off。
Wherein, the consistency qualification determining device 50, in the charge cutoff voltage shifted by delta VCharge cutoffAnd the electric discharge
Blanking voltage shifted by delta VElectric discharge cut-offIn the case where meeting the first condition for consistence, determine that the Capacity uniformity of the battery pack 100 closes
Lattice.Wherein, first condition for consistence is the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage offset
ΔVElectric discharge cut-offBelong to default fraction defective range.
The test method of the test macro of the battery pack Capacity uniformity and above-mentioned battery pack Capacity uniformity relative to
Advantage possessed by the prior art is identical, and details are not described herein.
Correspondingly, the embodiment of the present invention also provides a kind of machine readable storage medium, deposits on the machine readable storage medium
Instruction is contained, which is used for so that machine executes the test method of above-mentioned battery pack Capacity uniformity.
The machine readable storage medium include but is not limited to phase change memory (abbreviation of phase change random access memory devices,
Phase Change Random Access Memory, PRAM, also known as RCM/PCRAM), static random access memory
(SRAM), dynamic random access memory (DRAM), other kinds of random access memory (RAM), read-only memory
(ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (Flash Memory) or other memory skills
Art, read-only disc read only memory (CD-ROM) (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic
With the various media that can store program code such as disk storage or other magnetic storage devices.
The foregoing is merely better embodiments of the invention, are not intended to limit the invention, all of the invention
Within spirit and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of test method of battery pack Capacity uniformity, which is characterized in that the test method includes:
In the case that the voltage of any battery core in the battery pack reaches preset charged blanking voltage, stop to the battery
Packet charges, and acquires the charging voltage U of each battery core in battery pack described in the first predetermined time before stopping charging
(i)Charging；
In the case that the voltage of any battery core in the battery pack reaches default discharge cut-off voltage, stop to the battery
Packet discharges, and acquires the discharge voltage U of each battery core in battery pack described in the second predetermined time before stopping electric discharge
(i)Electric discharge；
Charging voltage U (i) based on each battery coreCharging, discharge voltage U (i)Electric discharge, calculate separately the charging of the battery pack
Blanking voltage shifted by delta VCharge cutoffWith discharge cut-off voltage shifted by delta VElectric discharge cut-off；And
In the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offMeet the first consistency
In the case where condition, determine that the Capacity uniformity of the battery pack is qualified,
Wherein, first condition for consistence is the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage is inclined
Move Δ VElectric discharge cut-offBelong to default fraction defective range.
2. the test method of battery pack Capacity uniformity according to claim 1, which is characterized in that the test method is also
Include:
From the charging voltage and discharge voltage of each battery core, the maximum value U of the charging voltage is filtered out respectivelymaxWith
The minimum value U of the discharge voltagemin；
The maximum value U of the charging voltage is determined respectivelymaxWith the minimum value U of the discharge voltageminThe mark of corresponding battery core；
And
In the maximum value U of the charging voltagemaxThe mark and the minimum value U of the discharge voltage of corresponding battery coreminIt is corresponding
In the case that the mark of battery core meets the second condition for consistence, determine that the Capacity uniformity of the battery pack is qualified,
Wherein, second condition for consistence is the maximum value U of the charging voltagemaxThe mark of corresponding battery core is put with described
The minimum value U of piezoelectric voltageminCorresponding battery core is identified as different marks.
3. the test method of battery pack Capacity uniformity according to claim 1, which is characterized in that the test method is also
It include: the discharge time for acquiring the battery pack,
In the case where the discharge time of the battery pack meeting third condition for consistence, determine that the capacity of the battery pack is consistent
Property it is qualified,
Wherein, the third condition for consistence is the discharge time of the battery pack to be greater than default discharge time, the default electric discharge
Time is related to the discharge current of the battery pack.
4. the test method of battery pack Capacity uniformity according to claim 1, which is characterized in that the default fraction defective
Range includes: that the first default fraction defective range, the second default fraction defective range and third preset fraction defective range, wherein described
Arbitrary value within the scope of first default fraction defective is respectively less than the arbitrary value within the scope of the described second default fraction defective, and described second is pre-
If the arbitrary value within the scope of fraction defective is respectively less than the arbitrary value within the scope of the default fraction defective of the third,
The test method further includes, in the case where determining the Capacity uniformity qualification of the battery pack, according to following methods
Determine the Capacity uniformity grade of the battery pack:
In the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offBelong to described first
In the case where default fraction defective range, determine that the Capacity uniformity of the battery pack reaches strong consistency；
In the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offBelong to described second
In the case where default fraction defective range, determine that the Capacity uniformity of the battery pack reaches time strong consistency；And
In the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offBelong to the third
In the case where default fraction defective range, determine that the Capacity uniformity of the battery pack reaches weak consistency.
5. the test method of battery pack Capacity uniformity as claimed in any of claims 1 to 4, which is characterized in that
The charging voltage U (i) based on each battery coreCharging, discharge voltage U (i)Electric discharge, calculate separately the charging of the battery pack
Blanking voltage shifted by delta VCharge cutoffWith discharge cut-off voltage shifted by delta VElectric discharge cut-offInclude:
From the charging voltage and discharge voltage of each battery core, the maximum value U of the charging voltage is filtered out respectivelymaxWith
The minimum value U of the discharge voltagemin；
Charging voltage U (i) based on each battery coreCharging, discharge voltage U (i)Electric discharge, the charging voltage maximum value UmaxWith
The minimum value U of the discharge voltagemin, the charge cutoff voltage shifted by delta V is calculatedCharge cutoffAnd the discharge cut-off voltage
Shifted by delta VElectric discharge cut-offMeet following equation respectively:
Wherein, U (i)ChargingFor the charging voltage of i-th of battery core, U (i)Electric dischargeIt is described for the discharge voltage and N of i-th battery core
The number of battery core in battery pack.
6. a kind of test macro of battery pack Capacity uniformity, which is characterized in that the test macro includes:
Control device, for performing the following operations:
In the case that the voltage of any battery core in the battery pack reaches preset charged blanking voltage, stop to the battery
Packet charges；Or
In the case that the voltage of any battery core in the battery pack reaches default discharge cut-off voltage, stop to the battery
Packet discharges,
Charging voltage acquisition device, for acquiring each battery core in battery pack described in the first predetermined time before stopping charging
Charging voltage U (i)Charging；
Discharge voltage acquisition device, for acquiring each battery core in battery pack described in the second predetermined time before stopping electric discharge
Discharge voltage U (i)Electric discharge；Computing device, the charging voltage U (i) based on each battery coreCharging, discharge voltage U (i)Electric discharge, respectively
Calculate the charge cutoff voltage shifted by delta V of the battery packCharge cutoffWith discharge cut-off voltage shifted by delta VElectric discharge cut-off；And
Consistency qualification determining device, in the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta
VElectric discharge cut-offIn the case where meeting the first condition for consistence, determine that the Capacity uniformity of the battery pack is qualified,
Wherein, first condition for consistence is the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage is inclined
Move Δ VElectric discharge cut-offBelong to default fraction defective range.
7. the test macro of battery pack Capacity uniformity according to claim 6, which is characterized in that the test macro is also
Include:
Screening plant, for filtering out the charging voltage respectively from the charging voltage and discharge voltage of each battery core
Maximum value UmaxWith the minimum value U of the discharge voltagemin；And
Battery core identifies determination unit, for determining the maximum value U of the charging voltage respectivelymaxWith the minimum of the discharge voltage
Value UminThe mark of corresponding battery core,
The consistency qualification determining device is also used to, in the maximum value U of the charging voltagemaxThe mark of corresponding battery core with
The minimum value U of the discharge voltageminIn the case that the mark of corresponding battery core meets the second condition for consistence, the electricity is determined
The Capacity uniformity of Chi Bao is qualified,
Wherein, second condition for consistence is the maximum value U of the charging voltagemaxThe mark of corresponding battery core is put with described
The minimum value U of piezoelectric voltageminCorresponding battery core is identified as different marks.
8. the test macro of battery pack Capacity uniformity according to claim 6, which is characterized in that the test macro is also
Include:
Time acquisition device, for acquiring the discharge time of the battery pack,
The consistency qualification determining device is also used to, and the feelings of third condition for consistence are met in the discharge time of the battery pack
Under condition, determine that the Capacity uniformity of the battery pack is qualified,
Wherein, the third condition for consistence is the discharge time of the battery pack to be greater than default discharge time, the default electric discharge
Time is related to the discharge current of the battery pack.
9. the test macro of battery pack Capacity uniformity according to claim 7, which is characterized in that the default fraction defective
Range includes: that the first default fraction defective range, the second default fraction defective range and third preset fraction defective range, wherein described
Arbitrary value within the scope of first default fraction defective is respectively less than the arbitrary value within the scope of the described second default fraction defective, and described second is pre-
If the arbitrary value within the scope of fraction defective is respectively less than the arbitrary value within the scope of the default fraction defective of the third,
One of the test macro further includes consistency grade determining device, for performing the following operations:
In the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offBelong to described first
In the case where default fraction defective range, determine that the Capacity uniformity of the battery pack reaches strong consistency；
In the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offBelong to described second
In the case where default fraction defective range, determine that the Capacity uniformity of the battery pack reaches time strong consistency；And
In the charge cutoff voltage shifted by delta VCharge cutoffAnd the discharge cut-off voltage shifted by delta VElectric discharge cut-offBelong to the third
In the case where default fraction defective range, determine that the Capacity uniformity of the battery pack reaches weak consistency.
10. a kind of machine readable storage medium, which is characterized in that be stored with instruction on the machine readable storage medium, this refers to
It enables and is used for the test method so that machine executes battery pack Capacity uniformity described in any one of the claims 1-5.
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