A life test method for metallized film capacitors for new energy vehicles
A metallized film, new energy vehicle technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve the problems of not considering the aging factor of high frequency and large ripple current, lack of scientificity, etc.
Active Publication Date: 2019-05-28
SHENZHEN HOVERBIRD ELECTRONICS TECH CO LTD
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Problems solved by technology
[0010] Other test methods (such as the above method 3) consider the aging factors of voltage, temperature and time, but the grouping, K, T, and H values are not scientific, and the aging factors of high frequency and large ripple current are also not considered.
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[0034] The invention will be described in detail below in conjunction with specific embodiments.
[0035] The invention releases the life test method of the automobile film capacitor innovatively, the specific test steps and acceptance criteria are as follows:
[0036] 1. Test overview
[0037] Construct an accelerated aging model for metallized film capacitors through test equipment, such as applying environmental temperature, humidity, current, voltage, time and other factors to accelerate the premature end of capacitor life, and finally accept when the ratio of the capacitor characteristic change value to the initial value meets the specified value . The test samples should meet the AQL sampling standard, and the quantity should be more than 2 sets.
[0038] 2. Test equipment
[0039] 1. Constant temperature and humidity box (with blower function);
[0040] 2. High temperature oven;
[0041] 3. Ripple power supply;
[0042] 4. Pulse power supply;
[0043] 5. DC const...
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The invention discloses a life test method of a metallized film capacitor used for a new energy automobile. The life test method comprises the following steps: step one, capacitor preprocessing before the test; step two, initial capacitance and loss angle tangent measurement; step three, pulse current testing; step four, intermediate capacitance and loss angle tangent measurement; step five, overvoltage and high current testing under the high temperature and high humidity environment; step six, final capacitance and loss angle tangent measurement; and step seven, inspection and acceptance. If all the sampled test samples have no breakdown and the capacity loss rate reaches the standard, the life test is successfully passed. The direct beneficial effects generated by the life test method are that (1) the life test method and judgment criteria of the metallized film capacitor used for the automobile are provided for the electric automobile industry; and (2) the capacitor manufacturing enterprises can be guided to screen out early failure of the capacitor through the accelerated aging mode.
Description
technical field [0001] The invention belongs to the technical field of film capacitor testing, and in particular relates to a life test method for metallized film capacitors used in new energy vehicles. Background technique [0002] There are two types of life test methods for existing capacitors: [0003] 1. The durability test method in GB 17702.2, the test is based on repeated overvoltage and overcurrent shocks, and the change value of product characteristics does not exceed the specified range of the initial value; [0004] 2. The durability test method in IEC 61071, the test is also based on repeated overvoltage and overcurrent shocks, and the ratio of the product characteristic change value to the initial value meets the specified value as the judgment standard; [0005] 3. There are also some other methods for capacitor life test, such as grouping small batch capacitors, respectively applying K times the rated voltage (K value 1.1-2.5), and storing them in a fixed te...
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IPC IPC(8): G01R31/00
CPCG01R31/003
Inventor 李贵生刘斌杜野吴鸿亮
Owner SHENZHEN HOVERBIRD ELECTRONICS TECH CO LTD