System and method for detecting health state acoustic emission of lithium ion battery
A lithium-ion battery and acoustic emission detection technology, which is applied in the direction of material analysis, measurement of electricity, and measurement devices using acoustic emission technology, which can solve the problem of high cost and achieve the effect of improving safety.
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[0049] Example one:
[0050] An acoustic emission detection system for lithium ion battery health status, see figure 1 ,include:
[0051] Charging and discharging equipment 1: It is electrically connected to the lithium-ion battery 5 to charge or discharge the lithium-ion battery 5;
[0052] Acoustic emission sensor 3: used to receive the acoustic emission signal inside the lithium ion battery 5 and convert it into an electrical signal;
[0053] The processing terminal 6 is electrically connected to the acoustic emission sensor 3; the processing terminal 6 is used to receive the electrical signal output by the acoustic emission sensor 3.
[0054] Specifically, because healthy, aging or damaged batteries have different internal material properties or structural properties, batteries in different health states will change due to changes in their internal material properties or structural properties, resulting in rapid release of strain energy. The stress wave forms an acoustic emission s...
Example Embodiment
[0065] Embodiment two:
[0066] An acoustic emission detection method for the health status of a lithium ion battery, which runs on the processing terminal in the system in the first embodiment, see figure 2 , Including the following steps:
[0067] S1: Collect the digital signal output by the acoustic emission preamplifier when the lithium ion battery sample is not charged or discharged, and record it as environmental noise;
[0068] Specifically, environmental noise is the acoustic emission signal collected when the lithium-ion battery is not in use, and also includes the noise of the surrounding environment.
[0069] S2: Set a filter threshold according to the environmental noise, and control the charging and discharging device to charge or discharge the lithium ion battery sample; specifically including controlling the charging and discharging device to perform constant current charging or constant voltage charging on the lithium ion battery sample.
[0070] Specifically, the filte...
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