Sorting method for self-discharge performance of high-capacity lithium battery
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A lithium battery and self-discharge technology, applied in the field of lithium-ion batteries, can solve the problems of poor voltage consistency of lithium batteries, bad batteries, and failure to screen in time, and achieve the effects of stable voltage, good consistency, and excellent cycle performance
Active Publication Date: 2019-08-23
HENAN FUSEN NEW ENERGY TECH
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[0007] The above sorting method can sort out the self-discharge performance of lithium batteries within a certain period of time, but there are de
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Embodiment 1
[0031] A sorting method for the self-discharge performance of high-capacity lithium batteries, comprising the following steps:
[0032] (1) Take the high-capacity lithium battery after 2 days of aging at a high temperature of 45°C after liquid injection;
[0033] (2) Formation steps: Step 1: Use 0.05C constant current to charge for 90 minutes; Step 2: Use 0.1C constant current to charge for 90 minutes; Step 3: Use 0.3C constant current to form an upper limit protection voltage of 4.3V, cut-off current 0.01C;
[0034] (3) Then use a tester with an accuracy of 0.0001V voltage accuracy to test OCV1, put it aside for 3 days at a high temperature of 40°C to 45°C, and then place it at room temperature for 12 hours, then test OCV2; filter out self-discharge by calculating the difference between OCV1-OCV2 Less than 50mv and greater than 65mv, the battery has a large difference;
[0035] (4) Capacity division steps: ①0.5C constant current discharge 2.75V; ②0.5C constant current const...
Embodiment 2
[0039] A sorting method for the self-discharge performance of high-capacity lithium batteries, comprising the following steps:
[0040] (1) Take the high-capacity lithium battery after 2 days of aging at a high temperature of 45°C after liquid injection;
[0041] (2) Formation steps: Step 1: Use 0.05C constant current to charge for 90 minutes; Step 2: Use 0.1C constant current to charge for 90 minutes; Step 3: Use 0.3C constant current to form an upper limit protection voltage of 4.3V, cut-off current 0.01C;
[0042] (3) Then use a tester with an accuracy of 0.0001V voltage accuracy to test OCV1, put it aside for 3 days at a high temperature of 40°C to 45°C, and then place it at room temperature for 12 hours, then test OCV2; filter out self-discharge by calculating the difference between OCV1-OCV2 Less than 50mv and greater than 65mv, the battery has a large difference;
[0043] (4) Capacity division steps: ①0.5C constant current discharge 2.75V; ②0.5C constant current constan...
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Abstract
The invention provides a method for sorting the self-discharge performance of a high-capacity lithium battery, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: taking a lithium battery which is filled with liquid and aged at the high temperature of 45 DEG C for 2 days, and performing constant-current charging for 90 minutes at the temperature of 0.05-0.1 DEG C; performing constant-current charging for 90 minutes at the temperature of 0.1-0.2 DEG C; employing 0.3 C constant-current constant-voltage formation, wherein the upper limit protection voltage is 4.3 V, and the cut-off current is 0.01 C; testing OCV1 by adopting a tester with the voltage precision of 0.0001 V, standing for 3 days at the high temperature of 40-45 DEG C, standing for 12 hours at the normal temperature, and testing the OCV2; screening the battery with large self-discharge difference through calculating the difference value of the OCV1-OCV2; according to the conventional 0.5 C charging and discharging detection capacity of a lithium battery, performing 0.5 C constant-current charging for 60 minutes, carrying out the voltage limiting for 4.2 V, finishing a cabinet test OCV3, testing the OCV4 after placement at normal temperature for 7 days, and controlling the difference value of OCV3-OCV4 to be less than or equal to 9mv, wherein the battery with the difference value being less than or equal to 9mv is qualified. According to the lithium battery manufactured by the method, the number of secondary capacity grading batteries can be reduced, and meanwhile,the consistency and the safety of subsequent lithium battery grouping use are improved.
Description
technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for sorting the self-discharge performance of high-capacity lithium batteries with high economical usability and safety. Background technique [0002] At present, compared with nickel-hydrogen and nickel-cadmium batteries, lithium-ion batteries are in the leading position in the 3C (computer, communication, consumer electronics) field with absolute advantages; at the same time, in order to meet the requirements of energy conservation and environmental protection, electric vehicles (including electric bicycles and electric vehicles) Automobile) has a broad market prospect. As a power source for electric vehicles, lithium-ion batteries are very competitive. Regardless of the 3C electronic consumer field or the electric vehicle application field, due to the high requirements for power supply energy, batteries must be used in parallel and in series...
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