Method for detecting corrosion of aluminum housing of lithium ion battery
A lithium-ion battery and aluminum casing technology, which is applied in the direction of measuring electricity, measuring electrical variables, weather resistance/light resistance/corrosion resistance, etc., can solve the problems of battery leakage, damage, safety hazards, etc., and is easy to implement and easy to operate , the effect of improving efficiency
Inactive Publication Date: 2018-06-15
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology
However, during the production process of aluminum case lithium-ion batteries, due to process defects, the insulating protection bag outside the battery cell may be folded and damaged, causing the positive and negative electrodes to contact the case, or the positive and negative electrodes are incomplete. contact with the cover etc.
When these defective products cannot be identified in time and are mixed into normal products for circulation and use, it will cause corrosion of the aluminum shell, and after a period of use of the whole vehicle, it will cause battery leakage and cause a series of safety hazards
Method used
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[0021] refer to figure 1 , a method for detecting corrosion of an aluminum casing of a lithium-ion battery proposed by the present invention includes the following steps.
[0022] S1. Obtain a voltage screening range for screening candidate batteries, and obtain a voltage boundary value for corrosion of the aluminum casing of the battery. In this embodiment, the voltage screening range is 2.7V≤V≤3.05V.
[0023] S2. Perform constant current discharge on the divided lithium-ion battery to a preset state of charge, and then obtain a candidate battery according to a voltage screening range. Specifically, in this step, after the battery is discharged at a constant current, it is judged whether the voltage difference between the positive and negative electrodes of the battery meets the voltage screening range, that is, whether it is within the voltage screening range, if yes, it means that the battery needs to undergo shell corrosion Test it and pick it out as a backup battery for...
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The invention discloses a method for detecting corrosion of an aluminum housing of a lithium ion battery. The method comprises the following steps that S1) a voltage screening range for screening alternative batteries is obtained, and a voltage boundary value of corrosion of the aluminum housing of the lithium ion battery is obtained; S2) current-constant discharging is carried out on a capacity graded lithium ion battery till a preset charged state, and an alternative battery is obtained according to the voltage screening range; S3) the alternative battery is kept standby at the preset temperature for preset time, and then the voltage difference of the anode of the alternative battery relative to the casing and the voltage difference of the cathode of the alternative battery relative to the casing are measured; and S4) the voltage differences are compared with the voltage boundary value to detect the alternative battery. According to the method of the invention, corrosion test of thealuminum casing of the battery is converted into test for the voltage difference between the anode and cathode of the battery relative to the casing, test indexes are made clear, the efficiency can beimproved, operation is simple, and the method is easy to realize.
Description
technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for detecting corrosion of an aluminum casing of a lithium ion battery. Background technique [0002] Lithium-ion battery is a new energy battery that is widely used in portable devices, electric vehicles, energy storage and other fields. Compared with other shells, lithium-ion batteries with aluminum shells are light in weight, high in specific energy, good in safety, and easy to use. Long life and other advantages, are widely used. However, during the production process of lithium-ion batteries with aluminum casings, due to process defects, the insulating protection bag outside the battery cell may be folded and damaged, causing the positive and negative electrodes to contact the casing, or the positive and negative electrodes are incomplete. contact with the cover, etc. When these defective products cannot be identified in time and are mixed into norma...
Claims
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Login to View More IPC IPC(8): G01R31/36G01N17/00
CPCG01N17/006G01R31/3865
Inventor 王世旭
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY