CN112834944A - Lithium battery accelerated cycle life testing method, device, medium and equipment - Google Patents
Lithium battery accelerated cycle life testing method, device, medium and equipment Download PDFInfo
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a method, a device, a medium and equipment for testing the accelerated cycle life of a lithium battery, which comprise the following steps: determining the upper and lower limits of the service voltage of the battery; acquiring a current charging and discharging curve, and dividing a voltage interval based on the current charging and discharging curve based on the upper and lower voltage limits of the battery; performing cycle test on the same cell sample in parallel in different voltage intervals, and correspondingly obtaining cycle attenuation of the different voltage intervals; and fusing the cyclic attenuation of the different voltage intervals to obtain the cyclic total attenuation. Compared with the prior art, the invention can realize accelerated cycle life test and obtain accurate capacity attenuation data under the condition of not influencing other attenuation mechanisms.
Description
Technical Field
The invention belongs to the technical field of testing of power batteries of electric automobiles, relates to a method for testing service life of a battery, and particularly relates to a method, a device, a medium and equipment for testing accelerated cycle life of a lithium battery.
Background
At present, the cycle life of a long-cycle-life lithium battery is usually more than 2000 times, the capacity attenuation is 20%, if the charge-discharge test multiplying factor is set to be 1C/1C, the cycle of a 100% SOC interval needs about 4 hours and the number of cycles per day is about 6, and therefore the 2000 cycle life usually needs about 1 year of test period. For batteries with longer cycle life, such as 10000 cycle life, the test period is as long as about 5 years, and the method has a long test period, so that a large amount of test resources are occupied, and the research and development progress of products is slow. How to shorten the test period is a technical problem to be solved in the field, and accelerating the cycle decay is a feasible method.
The test parameters usually associated with the degradation of the cycle life of the battery include the temperature of the battery cycle, the charge rate, the discharge rate, the depth of charge and discharge, etc., and the test time is usually reduced by temperature acceleration or rate acceleration. For example, the high-temperature life acceleration test method for the lithium iron phosphate battery disclosed in patent CN106093794B is mainly implemented by increasing the cycle temperature of the battery, and in order to judge the cycle life at the normal temperature of 25 ℃, the cycle decay is accelerated at a higher temperature, such as 45 ℃ or 55 ℃, to accelerate the examination of the cycle decay.
But different acceleration factors need to follow the same electrochemical decay mechanism, otherwise, the data obtained by the acceleration test cannot be used for the prediction of normal cycle decay data. For example, under different temperature interval conditions, different degradation mechanisms may exist in the battery, such as SEI consumption degradation at high temperature and Li precipitation degradation at low temperature. In addition, the rate acceleration may cause the destruction of the material bulk structure, thereby generating different attenuation mechanisms, and the normal cycle attenuation cannot be deduced. In addition, an unreasonable acceleration of the charge rate may lead to the generation of charged lithium dendrites, resulting in failure to accelerate the evaluation of cycle decay.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method, a device, a medium and equipment for testing the accelerated cycle life of a lithium battery, so that the accelerated cycle life test is realized and accurate capacity attenuation data is obtained under the condition of not influencing other attenuation mechanisms.
The purpose of the invention can be realized by the following technical scheme:
in a first aspect, the present invention provides a method for testing an accelerated cycle life of a lithium battery, comprising the following steps:
determining the upper and lower limits of the service voltage of the battery;
acquiring a current charging and discharging curve, and dividing a voltage interval based on the current charging and discharging curve based on the upper and lower voltage limits of the battery;
performing cycle test on the same cell sample in parallel in different voltage intervals, and correspondingly obtaining cycle attenuation of the different voltage intervals;
and fusing the cyclic attenuation of the different voltage intervals to obtain the cyclic total attenuation.
In an alternative embodiment, the current charging and discharging curve is a full cell 0.05C low current charging and discharging curve.
Further, when the voltage interval is divided, firstly, capacity/voltage differentiation is performed on the current charging and discharging curve to obtain a differential curve, the voltage interval is divided based on peaks appearing on the differential curve, and all the peaks cover each voltage interval.
In an alternative embodiment, when the voltage intervals are divided, the number of peaks is the same as the number of voltage intervals, and one voltage interval covers one peak.
In an alternative embodiment, the voltage interval division is performed such that all peaks cover one of the voltage intervals.
Further, when the cycle test is performed in different voltage intervals, the temperature and the charge-discharge rate are the same.
Further, fusing the cyclic attenuation of the different voltage intervals specifically includes:
Qloss(Vmin-Vmax)＝Qloss(Vmin-V1)+Qloss(V1-V2)+…+Qloss(Vn-2-Vn-1)+Qloss(Vn-1-Vmax)
wherein Q isloss(Vmin-Vmax) For cyclic total attenuation, Vmin、V1、V2、…、Vn-1、VminAt the boundary value of each voltage interval, VmaxIs the upper limit of voltage, VminIs a lower limit of voltage, Qloss(Vmin-V1)、Qloss(V1-V2)、…、Qloss(Vn-1-Vmax) Is the cyclic decay of each voltage interval.
In a second aspect, the present invention provides a device for testing an accelerated cycle life of a lithium battery, comprising:
the configuration module is used for configuring the upper and lower limits of the service voltage of the battery;
the interval division module is used for acquiring a current charging and discharging curve, and dividing voltage intervals based on the current charging and discharging curve based on the upper and lower voltage limits of the battery;
the test module is used for sending out a test signal and receiving the cyclic attenuation of the cyclic test of the same cell sample in parallel in different voltage intervals;
and the fusion module is used for fusing the cyclic attenuation of the different voltage intervals to obtain the cyclic total attenuation.
In a third aspect, the invention provides a computer readable storage medium comprising one or more programs for execution by one or more processors of an electronic device, the one or more programs including instructions for performing a method for accelerated cycle life testing of a lithium battery as described above.
In a fourth aspect, the present invention provides an electronic device comprising:
one or more processors;
a memory; and
one or more programs stored in the memory, the one or more programs including instructions for performing the lithium battery accelerated cycle life testing method as described above.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention carries out voltage distribution interval cycle test on the same battery core sample within a certain use voltage range, thereby effectively reducing the test time. If the SOC interval is divided into 5 sections, the time of circulating 2000 times is shortened from about 1 year to about 2 months, the circulating time is only 1/5, and the SOC interval has important significance for accelerating the speed of product development.
2. The invention does not change the test temperature and the test charging and discharging multiplying power, only reduces the time of cycle evaluation by the way of dividing the SOC into sections for cycle and increasing the number of samples, accelerates the cycle, does not influence the attenuation mechanism, and has more accurate and reliable test results.
3. The partitioned parallel cycle life test is realized based on the division of different characteristic peaks of a dQ/dV-V curve, and the electrochemical attenuation of different materials is partitioned, so that certain differentiation of attenuation sources is realized, the influence of different attenuation sources on the test is reduced, and the overall test effect is improved.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a graph illustrating the cyclic decay results of an embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
As shown in fig. 1, the present embodiment provides a method for testing an accelerated cycle life of a lithium battery, including the following steps:
step S101, determining upper and lower limits V of battery use voltageminAnd Vmax，VmaxIs the upper limit of voltage, VminIs the lower voltage limit.
And S102, acquiring a current charging and discharging curve, and dividing voltage intervals based on the current charging and discharging curve based on the upper and lower voltage limits of the battery.
In this embodiment, the full cell is first subjected to a low current charge and discharge curve of 0.05C, and then subjected to capacity/voltage differentiation by the low current discharge curve of the full cell to obtain a dQ/dV-V curve, based on peaks appearing on the curve, such as Peak1，Peak2…PeaknAnd the like, the SOC section of the full cell is divided. The physical meaning of the dQ/dV-V curve is that it represents the capacity value contained in the material within a certain voltage range, and a voltage platform usually exists for the positive and negative electrode materials of the lithium ion battery. Near the plateau, the very small voltage ranges are all at higher capacity values, existing as peaks on the dQ/dV-V curve. By dividing the voltages of different characteristic peaks of a dQ/dV-V curve, the circulation between the sections is realized, so that the electrochemical attenuation of different materials is distinguished, and the attenuation sources are distinguished to a certain extent (such as anode loss, cathode loss, active lithium loss and the like). In this embodiment, the voltage interval V corresponding to 0-100% SOC is representedmin-VmaxEach divided voltage interval is Vmin-V1；V1-V2…Vn-2-Vn-1；Vn-1-Vmax(ii) a n intervals, and different Peak1，Peak2…PeaknAll covered in the interval.
In an alternative embodiment, the coverage pattern is such that one interval covers one peak. In another alternative embodiment, one interval covers n peaks, and the remaining intervals are covered by no peaks.
Step S103, carrying out cycle testing on the same cell sample in parallel in different voltage intervals, and correspondingly obtaining cycle attenuation of the different voltage intervals.
Step S104, fusing the cyclic attenuation of the different voltage intervals to obtain cyclic total attenuation, specifically:
Qloss(Vmin-Vmax)＝Qloss(Vmin-V1)+Qloss(V1-V2)+…+Qloss(Vn-2-Vn-1)+Qloss(Vn-1-Vmax)
wherein Q isloss(Vmin-Vmax) For cyclic total attenuation, Vmin、V1、V2、…、Vn-1、VminAt the boundary value of each voltage interval, VmaxIs the upper limit of voltage, VminIs a lower limit of voltage, Qloss(Vmin-V1)、Qloss(V1-V2)、…、Qloss(Vn-1-Vmax) Is the cyclic decay of each voltage interval.
By the method, accurate capacity attenuation data can be obtained under the condition of not influencing other attenuation mechanisms, the fusion result is shown in fig. 2, and the test time is greatly shortened by increasing the SOC interval and the number of samples. In the present embodiment, the SOC interval is divided into 5 segments, the time for 2000 cycles is shortened from about 1 year to about 2 months, and the cycle time is only 1/5.
The above method, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Example 2
The embodiment provides a lithium battery accelerated cycle life testing device which comprises a configuration module, an interval division module, a testing module and a fusion module, wherein the configuration module is used for configuring upper and lower limits of the service voltage of a battery; the interval division module is used for acquiring a current charging and discharging curve, and dividing voltage intervals based on the current charging and discharging curve based on the upper and lower voltage limits of the battery; the test module is used for sending out a test signal and receiving the cyclic attenuation of the cyclic test of the same cell sample in parallel in different voltage intervals; and the fusion module is used for fusing the cyclic attenuation of the different voltage intervals to obtain the cyclic total attenuation. The operation of the device is described with reference to example 1.
Example 3
The present embodiment provides an electronic device comprising one or more processors, memory, and one or more programs stored in the memory, the one or more programs including instructions for performing the method for accelerated cycle life testing of a lithium battery as described in embodiment 1.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A lithium battery accelerated cycle life test method is characterized by comprising the following steps:
determining the upper and lower limits of the service voltage of the battery;
acquiring a current charging and discharging curve, and dividing a voltage interval based on the current charging and discharging curve based on the upper and lower voltage limits of the battery;
performing cycle test on the same cell sample in parallel in different voltage intervals, and correspondingly obtaining cycle attenuation of the different voltage intervals;
and fusing the cyclic attenuation of the different voltage intervals to obtain the cyclic total attenuation.
2. The accelerated cycle life test method of a lithium battery according to claim 1, wherein the current charge-discharge curve is a full battery low current charge-discharge curve of 0.05C.
3. The method as claimed in claim 1, wherein when the voltage interval is divided, the current charging/discharging curve is first subjected to capacity/voltage differentiation to obtain a differential curve, the voltage interval is divided based on peaks appearing on the differential curve, and all the peaks cover each voltage interval.
4. The accelerated cycle life test method of a lithium battery as claimed in claim 3, wherein the number of peaks is the same as the number of voltage intervals, and one voltage interval covers one peak when the voltage intervals are divided.
5. The method as claimed in claim 3, wherein all the peaks cover one of the voltage intervals when the voltage intervals are divided.
6. The method as claimed in claim 1, wherein the temperature and the charge-discharge rate are the same when the cycle test is performed in different voltage intervals.
7. The accelerated cycle life testing method of a lithium battery according to claim 1, wherein the fusing of the cycle decays of the different voltage intervals specifically comprises:
Qloss(Vmin-Vmax)＝Qloss(Vmin-V1)+Qloss(V1-V2)+…+Qloss(Vn-2-Vn-1)+Qloss(Vn-1-Vmax)
wherein Q isloss(Vmin-Vmax) For cyclic total attenuation, Vmin、V1、V2、…、Vn-1、VminAt the boundary value of each voltage interval, VmaxIs the upper limit of voltage, VminIs a lower limit of voltage, Qloss(Vmin-V1)、Qloss(V1-V2)、…、Qloss(Vn-1-Vmax) Is the cyclic decay of each voltage interval.
8. The utility model provides a lithium cell cycle life testing arrangement with higher speed which characterized in that includes:
the configuration module is used for configuring the upper and lower limits of the service voltage of the battery;
the interval division module is used for acquiring a current charging and discharging curve, and dividing voltage intervals based on the current charging and discharging curve based on the upper and lower voltage limits of the battery;
the test module is used for sending out a test signal and receiving the cyclic attenuation of the cyclic test of the same cell sample in parallel in different voltage intervals;
and the fusion module is used for fusing the cyclic attenuation of the different voltage intervals to obtain the cyclic total attenuation.
9. A computer-readable storage medium comprising one or more programs for execution by one or more processors of an electronic device, the one or more programs including instructions for performing the method for accelerated cycle life testing of a lithium battery of any of claims 1-7.
10. An electronic device, comprising:
one or more processors;
a memory; and
one or more programs stored in the memory, the one or more programs including instructions for performing the method for accelerated cycle life testing of a lithium battery as claimed in any of claims 1 to 7.
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