Method for testing self-discharge of battery
A test method and self-discharge technology, which is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables, etc., can solve the problems of low test efficiency, long storage time at room temperature, and high misjudgment rate of self-discharge test, so as to reduce the test time of self-discharge , improve accuracy, and improve test efficiency
Pending Publication Date: 2022-03-15
航天锂电科技(江苏)有限公司
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[0003] However, when each type of battery is charged to the same specified SOC value, the misjudgment rate of the self-discharge test will be high, and, during the self-discharge test, the time spent at room temperature is longer, and the self-discharge test takes a long time. Inefficient testing
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[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
[0020] see figure 1 , The invention provides a batt...
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The invention provides a method for testing self-discharge of a battery. The method comprises the following steps: charging and discharging the battery for the first time; obtaining a relation curve of the discharge voltage and the charge state of the battery in the first discharge process, and obtaining a test voltage; charging and discharging the battery for the second time, wherein the cut-off voltage is the test voltage; after the battery stands still for a first time period at normal temperature, measuring a first voltage V1 of the battery, and recording the first voltage V1 as a first time T1; standing the battery at high temperature for a second time period, and carrying out a vibration test on the battery; after the battery stands still for a third time period at the normal temperature, measuring a second voltage V2 of the battery, and recording the second voltage V2 as a second time T2; and screening out a plurality of self-discharge qualified batteries based on the first voltage V1, the second voltage V2, the first time T1 and the second time T2. According to the battery self-discharge test method provided by the invention, the accuracy of the self-discharge test can be improved, the self-discharge test time is shortened, and the test efficiency is improved.
Description
【Technical field】 [0001] The invention relates to the technical field of power batteries, in particular to a battery self-discharge testing method. 【Background technique】 [0002] With the popularity of electric vehicles, the lithium battery market is experiencing explosive growth, which also requires higher battery capacity and better performance. Battery self-discharge performance evaluation has an important impact on battery cost and production cycle. The existing self-discharge test method is usually to first charge and discharge the battery, and then charge it to the specified SOC (state of charge) with constant current and constant voltage. The SOC is generally 10-50%, then leave it at room temperature for 24 hours, measure the open circuit voltage and record the time, and then measure the open circuit voltage and record the time after leaving it at room temperature for 168 hours, and then calculate the self-discharge rate of the battery to screen qualified products. ...
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Login to View More IPC IPC(8): G01R31/382
CPCG01R31/36
Inventor 陈帅
Owner 航天锂电科技(江苏)有限公司