CN109239616A - Battery life decaying appraisal procedure, device and computer readable storage medium - Google Patents
Battery life decaying appraisal procedure, device and computer readable storage medium Download PDFInfo
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- CN109239616A CN109239616A CN201811416462.6A CN201811416462A CN109239616A CN 109239616 A CN109239616 A CN 109239616A CN 201811416462 A CN201811416462 A CN 201811416462A CN 109239616 A CN109239616 A CN 109239616A
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Abstract
The invention discloses a kind of battery life decaying appraisal procedure, device and computer readable storage mediums, comprising: obtains standard discharge curve of battery core at a temperature of T, obtains internal resistance R of battery core at a temperature of T, when residual capacitance is SOCiSOCiAnd internal resistance RSOCiCorresponding voltage value VSOCiWith current value I；The battery core discharge curve that kth recycles at a temperature of T is obtained, acquisition battery core kth at a temperature of T discharges into residual capacitance and isSOCiWhen internal resistanceAnd the internal resistanceCorresponding voltage valueWith electric current IK；Battery core is calculated at a temperature of T after K cycle charge-discharge, is the invalid coefficient x at SOCi in residual capacitance；If 0≤x < a, then it represents that battery core after K cycle charge-discharge, is in residual capacitance at a temperature of TSOCiPlace is without failure diving risk；If x >=a, then it represents that there is failure diving risk.The present invention can quickly judge battery with the presence or absence of diving failure risk, additionally it is possible to shorten the power battery cyclic test period, reduce battery cycle life experimentation cost.
Description
Technical field
The invention belongs to new-energy automobile power battery technical fields, and in particular to a kind of battery life decaying assessment side
Method, device and computer readable storage medium.
Background technique
Being graduallyd mature by world market policy support and technology is influenced, and whole world electric car ownership has been broken through at present
Million high pointes.Kernel component of the lithium ion battery as electric car is the key that restrict electric vehicle development, it may be said that new
The development of energy automobile is exactly the development of battery technology.
Lithium battery is as Vehicular dynamic battery, it is advantageous that energy density is high, small in size, light-weight, cycle-index is high
(current driving force battery material battery normal temperature circulation can reach 2000 times), charge efficiency height etc..But as Vehicular dynamic battery
Its quality problems also more aobvious concentration: being mainly reflected in charging time problem, battery durable mileage shortens, power interruption etc., wherein
Charging time relevant to electrokinetic cell system and cell performance decay are particularly problematic.In general, the longevity of power battery
Life is divided into two parts, cycle life and storage life, and the current power battery life test period is long, at high cost, occupies big
Bench test resource is measured, the exploitation requirement of current " short frequency is fast " project is not suitable for, how to establish quick test and evaluation method,
Effectively shorten the test period, reduce experimentation cost, while the service life of Accurate Prediction battery is current one urgently to be resolved
Problem.
Summary of the invention
The object of the present invention is to provide a kind of battery life decaying appraisal procedure, device and computer readable storage medium,
Can quickly judge battery with the presence or absence of diving failure risk, while can be shortened the power battery cyclic test period, reduce battery follow
Ring life test cost.
Battery life decaying appraisal procedure of the present invention, comprising the following steps:
Step 1 obtains standard discharge curve of battery core at a temperature of T, and acquisition battery core is at a temperature of T, residual capacitance is
Internal resistance R when SOCiSOCiAnd internal resistance RSOCiCorresponding voltage value VSOCiWith current value I；
Step 2 obtains the battery core discharge curve that kth recycles at a temperature of T, obtains battery core kth at a temperature of T and discharges
To residual capacitance be SOCi when internal resistanceAnd the internal resistanceCorresponding voltage valueWith electric current IK；
Step 3 calculates battery core at a temperature of T after K cycle charge-discharge, is the failure system at SOCi in residual capacitance
Number x, the calculation formula of invalid coefficient x are as follows:
Invalid coefficient x is compared by step 4 with preset threshold a, if 0≤x < a, then it represents that battery core is at a temperature of T through K
It is at SOCi without failure diving risk in residual capacitance after secondary cycle charge-discharge；If x >=a, then it represents that battery core is in T temperature
It is lower after K cycle charge-discharge, residual capacitance be SOCi place exist failure dive risk.
Battery life of the present invention decaying assessment device, including memory, processor and it is stored in the storage
In device and the computer program that can run on the processor, the processor are realized when executing the computer program as weighed
Benefit require 1 described in step.
Computer readable storage medium of the present invention, the computer-readable recording medium storage have computer journey
Sequence, the computer program realize step as described in claim 1 when being executed by processor.
The invention has the following advantages that can quickly judge that battery whether there is diving failure risk using this method,
The power battery cyclic test period can be shortened simultaneously, and reduce battery cycle life experimentation cost.
Detailed description of the invention
Fig. 1 is the comparison diagram of the discharge curve of standard discharge curve and K electric discharge at normal temperature of the invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
In the present embodiment, the battery life decaying appraisal procedure, comprising the following steps:
Step 1 obtains standard discharge curve of battery core at a temperature of T, and acquisition battery core is at a temperature of T, residual capacitance is
Internal resistance R when SOCiSOCiAnd internal resistance RSOCiCorresponding voltage value VSOCiWith current value I.
Step 2 obtains the battery core discharge curve that kth recycles at a temperature of T；Battery core kth at a temperature of T is obtained to discharge
To residual capacitance be SOCi when internal resistanceAnd the internal resistanceCorresponding voltage valueWith electric current IK。
Step 3 calculates battery core at a temperature of T after K cycle charge-discharge, is the failure system at SOCi in residual capacitance
Number x, the calculation formula of invalid coefficient x are as follows:
Invalid coefficient x is compared by step 4 with preset threshold a, if 0≤x < a, then it represents that battery core is at a temperature of T through K
It is at SOCi without failure diving risk in residual capacitance after secondary cycle charge-discharge；If x >=a, then it represents that battery core is in T temperature
It is lower after K cycle charge-discharge, residual capacitance be SOCi place exist failure dive risk.
In the present embodiment, standard discharge curve, internal resistance R of the battery core at a temperature of TSOCi, voltage value VSOCi, current value I, T temperature
Spend discharge curve, the internal resistance of lower kth circulationVoltage valueWith electric current IKAcquisition methods be the prior art, therefore
Details are not described herein again.
With example, the present invention will be described below:
As shown in Figure 1, the standard discharge curve of battery core at normal temperature (carries out the nothing of charge and discharge with minimum electric current (0.05C)
Polarization curve) and kth electric discharge discharge curve, residual capacitance SOC is fixed on 50%, calculates battery core at normal temperature through K
After secondary cycle charge-discharge, in invalid coefficient x of the residual capacitance SOC at 50%, then by invalid coefficient x and preset threshold a
It is compared, it is assumed that preset threshold a is 0.1；If 0≤x < 0.1, then it represents that battery core at normal temperature after K cycle charge-discharge,
It is the risk of diving that do not fail at 50% in residual capacitance SOC；If x >=0.1, then it represents that battery core is recycled through K times at normal temperature
It is the presence of failure diving risk at 50% in residual capacitance SOC after charge and discharge.
In the present embodiment, the test of battery core is generally required and is carried out under high temperature, room temperature and low temperature, therefore the specific value of T
It is determined according to corresponding laws and regulations requirement.The value of K can since 1 or other numerical value, such as: as K=1, if utilizing this reality
Method described in example the is assessed risk the result is that no-failure is dived is applied, then sets K=K+a, a is equal to 1 or is other positive integers,
Method described in the present embodiment is recycled to assess battery core, if occurring failure diving risk in K1, stopping is commented
Estimate, and show that the service life of the battery is K1 times.
Battery life of the present invention decaying assessment device, including memory, processor and it is stored in the storage
In device and the computer program that can run on the processor, the processor are realized when executing the computer program such as institute
The step of stating battery life decaying appraisal procedure.
Computer readable storage medium of the present invention, the computer-readable recording medium storage have computer journey
Sequence is realized when the computer program is executed by processor as this is such as the step of battery life decaying appraisal procedure.
Claims (3)
- The appraisal procedure 1. a kind of battery life is decayed, which comprises the following steps:Step 1 obtains standard discharge curve of battery core at a temperature of T, and acquisition battery core is at a temperature of T, residual capacitance isSOCiWhen Internal resistance RSOCiAnd internal resistance RSOCiCorresponding voltage value VSOCiWith current value I；Step 2 obtains the battery core discharge curve that kth recycles at a temperature of T, and acquisition battery core kth at a temperature of T discharges into surplus Internal resistance when remaining capacitance is SOCiAnd the internal resistanceCorresponding voltage valueWith electric current IK；Step 3, calculating battery core after K cycle charge-discharge, are in residual capacitance at a temperature of TSOCiThe invalid coefficient x at place, should The calculation formula of invalid coefficient x is as follows:Invalid coefficient x is compared by step 4 with preset threshold a, if 0≤x < a, then it represents that battery core is followed at a temperature of T through K times After ring charge and discharge, it is in residual capacitanceSOCiPlace is without failure diving risk；If x >=a, then it represents that battery core is at a temperature of T through K After secondary cycle charge-discharge, it is in residual capacitanceSOCiThere is failure diving risk in place.
- 2. a kind of battery life decaying assessment device, including memory, processor and storage are in the memory and can be The computer program run on the processor, which is characterized in that the processor is realized such as when executing the computer program Step described in claim 1.
- 3. a kind of computer readable storage medium, the computer-readable recording medium storage has computer program, and feature exists In the computer program realizes step as described in claim 1 when being executed by processor.
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Cited By (6)
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| CN110850319A (en) * | 2019-11-07 | 2020-02-28 | 北京海博思创科技有限公司 | Method and device for estimating number of cycles of battery from water jumping point and electronic equipment |
| CN112255558A (en) * | 2019-12-31 | 2021-01-22 | 蜂巢能源科技有限公司 | Method and device for calculating battery calendar life attenuation |
| CN112327193A (en) * | 2020-10-21 | 2021-02-05 | 北京航空航天大学 | Lithium battery capacity diving early warning method |
| CN112327194A (en) * | 2020-10-21 | 2021-02-05 | 北京航空航天大学 | Lithium battery capacity diving identification method and device |
| CN113156324A (en) * | 2021-03-03 | 2021-07-23 | 同济大学 | Electric vehicle battery pack end-of-life diagnosis method combined with charging pile |
| CN113655398A (en) * | 2021-08-11 | 2021-11-16 | 远景动力技术(江苏)有限公司 | Method for estimating cycle water-jumping of lithium battery |
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| CN112327193A (en) * | 2020-10-21 | 2021-02-05 | 北京航空航天大学 | Lithium battery capacity diving early warning method |
| CN112327194A (en) * | 2020-10-21 | 2021-02-05 | 北京航空航天大学 | Lithium battery capacity diving identification method and device |
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| CN113156324A (en) * | 2021-03-03 | 2021-07-23 | 同济大学 | Electric vehicle battery pack end-of-life diagnosis method combined with charging pile |
| CN113156324B (en) * | 2021-03-03 | 2022-08-05 | 同济大学 | Electric vehicle battery pack end-of-life diagnosis method combined with charging pile |
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