Testing method for improving circulating life of battery in use
An experimental method and cycle life technology, which is applied in the field of lithium-ion battery cycle performance research, can solve problems that do not conform to actual usage conditions, and achieve the effects of reducing the probability of overcharge and overdischarge, protecting the battery, and improving consistency
Inactive Publication Date: 2018-06-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology
[0004] Improving battery capacity and service life is the general trend of battery development today. Under the condition of the cycle performance of existing electrode materials, it is obviously not in line with the actual use to reduce the charge and discharge rate to improve the service life.
Method used
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[0030] refer to figure 1 , figure 2 , a kind of experimental method that the present invention proposes to improve battery service cycle life, comprises:
[0031] Step S1, charge and discharge the target battery under the first preset condition, and obtain the corresponding relationship between the SOC and voltage of the target battery according to the charge and discharge data of the target battery, denoted as SOC-OCV, specifically including:
[0032] S11. After the target battery is left to stand for 1 hour, place the target battery under a normal temperature test cabinet and discharge it with a current of 1C until the voltage is 3.0V;
[0033] S12. After the target battery is left to stand for 1 hour, charge the target battery at a constant current of 1C to a voltage of 4.2V, and then charge the target battery at a constant voltage to a current of 0.05C;
[0034] S13. After the target battery is left to stand for 1 hour, discharge the target battery with a current of 1C ...
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The invention discloses a testing method for improving circulating life of a battery in use. The method comprises the following steps: charging and discharging a target battery; obtaining corresponding relation between the target battery SOC and voltage based on the charging and discharging data of the target battery, and marking the corresponding relation as SOC-OCV; acquiring one SOC subarea inan SOC area set; obtaining an upper voltage limit value and a lower voltage limit value corresponding to an upper limit value and a lower limit value of the SOC area of the target battery, and markingas Vx and Vy; charging and discharging the target battery n times based on the Vx and Vy; recording the ratio of the capacitance of the target battery after charging and discharging n times to the primary capacitance of the target battery; repeating steps S2 and S3 on m SOC subareas in the SOC area set to obtain the ratio of the capacitance of corresponding m target batteries to the primary capacitance of the target battery, and marking as Q1, Q2...Qm; and acquiring the SOC area corresponding to the maximum value of the Q1, Q2...Qn as the optimal SOC area of the target battery.
Description
technical field [0001] The invention relates to the technical field of research on the cycle performance of lithium-ion batteries, in particular to an experimental method for improving the cycle life of batteries. Background technique [0002] Battery technology is the core of pure electric and hybrid vehicle technology, and its results directly affect the endurance, acceleration, load capacity, adaptability to extreme environments, safety, stability, efficiency and service life of electric vehicles. With the rapid development of today's new energy vehicle industry, more and more consumers are beginning to care about whether the service life of power lithium-ion batteries can meet the service life requirements of electric vehicle design. [0003] In the "Cycle Life Requirements and Experimental Methods of Traction Batteries for Electric Vehicles" (GBT31484-2015), it is required that the discharge capacity of battery samples should not be less than 90% of the initial capacity...
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IPC IPC(8): G01R31/36
CPCG01R31/388
Inventor 夏厚勇厉运杰孙言飞韩威振
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY