Screening method for self-discharge of lithium-ion batteries
A technology of a lithium ion battery and a screening method is applied in the field of self-discharge screening of lithium ion batteries, which can solve the problems of low production efficiency and cumbersome screening process, and achieve the effects of improving production efficiency, simple operation and easy identification.
Active Publication Date: 2020-07-17
DONGGUAN CHUANGMING BATTERY TECH
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a screening method for lithium-ion battery self-discharge, aiming at solving the technical problem that the screening process of existing lithium-ion battery self-discharge defective products is extremely cumbersome, resulting in low production efficiency
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Embodiment 1
[0062] A screening method for lithium-ion battery self-discharge, comprising the steps:
[0063] (1) Discharge the formed lithium-ion battery sample to 2.50V (0% SOC) according to the following steps:
[0064] ①, 0.5C constant current discharge to 2.50V;
[0065] ②. Leave it on hold for 15 minutes;
[0066] ③, 0.1C constant current discharge to 2.50V;
[0067] ④, put on hold for 15 minutes;
[0068] ⑤, 0.02C constant current discharge to 2.50V.
[0069] ⑥, put on hold for 15 minutes;
[0070] (2) Aging treatment of the discharged lithium-ion battery samples: aging at 45°C for 6 days, and then testing the voltage U 测1 , and classify the batteries according to V1. The classification basis is shown in Table 1 below. The results after classification are as follows Figure 1-4 shown.
[0071] Table 1
[0072] gear letter code u 测1 voltage range
processing method High pressure not unbinned H u 测1 >3.420V
Re-do the discharge step high pr...
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The invention relates to a lithium ion battery self discharge screening method. The method comprises the following steps: a to-be-tested lithium ion battery sample is provided; the to-be-tested lithium ion battery sample is discharged to 0%SOC, and the open circuit voltage Uopen of the lithium ion battery sample is 2.75 to 3.45 V; the lithium ion battery sample after discharge is subjected to first aging processing, first test voltage Utest1 is obtained, and according to the magnitude of the first test voltage Utest1, the lithium ion battery sample is graded; the lithium ion battery sample after first aging processing is subjected to second aging processing, second test voltage Utest2 is obtained, standard voltage Ustandard of the grade after grading is determined, the second test voltageUtest2 is compared with the standard voltage Ustandard of the grade, and whether self discharge of the lithium ion battery sample is qualified is determined; and when Utest2 is larger than Ustandard,self discharge of the lithium ion battery sample is qualified, and when Utest2 is no larger than Ustandard, self discharge of the lithium ion battery sample is not qualified.
Description
technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a screening method for self-discharge of lithium ion batteries. Background technique [0002] If the battery has been idle and not used, it will also lose power. This phenomenon is called the self-discharge phenomenon of the battery. The self-discharge rate, also known as the charge retention capacity, refers to the capacity of the battery to maintain the stored power under certain environmental conditions in an open circuit state. Generally speaking, self-discharge is mainly affected by manufacturing process, materials, and storage conditions. The self-discharge rate is one of the main parameters to measure battery performance. [0003] At present, most of the screening methods for self-discharge defective products of battery manufacturers are the voltage drop method, that is, the voltage V1 is tested after the battery is aged at high temperature for a...
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IPC IPC(8): G01R31/378
CPCG01R31/385
Inventor 罗国恩周崇旺赵悠曼杨俊
Owner DONGGUAN CHUANGMING BATTERY TECH