Test method of connection reliability of battery system
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A battery system and testing method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of fast and effective detection of connection failures of power circuits that cannot be realized, so as to ensure safety and reliability, and improve safety. performance, and the effect of improving evaluation efficiency
Active Publication Date: 2017-01-11
CALB CO LTD
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[0005] The purpose of the present invention is to provide a test method for the connection reliability of the battery system to solve the problem that the existing technology cannot realize the fast and effective detection of the connection fault of the power circuit of the battery system
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Embodiment 1
[0035] The test method for the battery system connection reliability of embodiment 1 includes the following steps:
[0036] 1) Under static conditions, use test instruments to measure the AC resistance of each battery pack in the battery system, and compare them with the corresponding qualification standards;
[0037] If the AC internal resistance meets the qualified standard, proceed to step 2);
[0038] If the AC internal resistance exceeds the qualified standard, it indicates that the connection of the battery pack is abnormal;
[0039] 2) Under 50% SOC, use the current I to discharge or charge the battery system for 1 minute, and check the maximum voltage difference of the battery pack, which is recorded as ΔU;
[0040] If the pressure difference meets the qualified standard, indicating that the connection reliability of the battery pack is normal, proceed to step 3);
[0041] If the pressure difference exceeds the qualified standard, it indicates that the connection of ...
experiment example
[0070] In this experimental example, the power system of the above-mentioned battery system connection reliability test method is used for testing, including the following contents:
[0071] The measured power system consists of 2 parallel 36 series of 200Ah lithium iron phosphate batteries, including 3 battery boxes. The AC internal resistance of the battery pack, the voltage difference ΔU of the battery pack, and the DC internal resistance DCR of the electrical circuit are given below for the three test systems 电气回路 The actual measurement data, the judgment standard, the judgment result and the determination method of the qualification standard of the three indicators.
[0072] The test results of the three test systems are shown in Table 2.
[0073] Table 2 Test results of three sets of test systems
[0074]
[0075]
[0076] In the test method for the reliability of the connection of the battery system mentioned above, the determination method for the qualification...
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Abstract
The invention relates to a test method of a connection reliability of a battery system. The method includes: 1) in a static state, the alternating current resistance of each battery pack in the battery system is measured; and if the alternating current internal resistance satisfies the qualification standard, step 2) is performed; 2) charging and discharging of the battery system are performed, and the overall pressure difference of each battery pack in a required SOC in a short-time charging or discharge process is measured; and if the pressure difference satisfies the qualification standard, step 3) is performed; and 3) the direct current internal resistance of an electrical circuit is calculated; and if the direct current internal resistance satisfies the qualification standard, it is proved that the connection of the battery system is reliable. According to the method, the battery system is divided into two portions referring to the battery packs and the electrical circuit for evaluation, the overage is comprehensive, fault positioning is facilitated, problems such as missed screwing of bolts, slipped screws, and missed soldering etc. and connection problems such as oxidation of the battery pack portion, unqualified fastening torque, and false welding etc. can be simply and conveniently checked, reliable connection of the electrical circuit portion is ensured, accurate and rapid evaluation of the connection reliability of the battery system is realized, and the security and the reliability of the battery system are guaranteed.
Description
technical field [0001] The invention belongs to the technical field of power battery systems, and in particular relates to a test method for battery system connection reliability. Background technique [0002] In recent years, the development of electric vehicles has advanced by leaps and bounds, and more and more electric vehicles have gradually entered people's lives. With the continuous promotion of new energy vehicles, the safety of electric vehicles has attracted much attention. As the power source of electric vehicles, the safety and reliability of the battery system is also extremely important, and it is one of the important guarantees for the safety of the whole vehicle. [0003] General, such as figure 1 As shown, the battery system is composed of multiple battery packs 1#, 2#, K# in series, one end is the positive pole of the system, and the other end is the negative pole of the system. Such as figure 2 As shown, the battery pack is composed of two parts, the ...
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