System and method for detecting parameters of battery pack
A technology for parameter detection and battery packs, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem that the battery pack is difficult to use, and achieve the effect of reducing parameter requirements
Pending Publication Date: 2021-12-17
恒钧检测技术有限公司
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However, such methods are only applicable to the case of constant low battery pack voltage such as single cell and several cells connected in series.
In addition, in the actual test, due to the high open circuit voltage of the battery pack (above tens of volts), it is difficult for ordinary electrochemical workstations, potentiostats, and galvanostats to meet the AC ripple output characteristics under such DC high voltage conditions. Therefore, this method is difficult to use in battery packs
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[0037] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0038] Such as figure 1 As shown, an embodiment of the present invention provides a system for detecting battery pack parameters, including a battery pack to be tested, an auxiliary unit, an EIS detection device, and a switch unit; the auxiliary unit is suitable for being connected in series with the battery pack to be tested system; the switch unit is used to control the current direction to realize the parameter detection of the auxiliary unit, the charging of the auxiliary unit and the parameter detection of the series system; the EIS detection device is used to connect with the auxiliary unit in series Realize the parameter detection of the auxiliary unit, the EIS detection device is also used to be connected in series with the series ...
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The invention provides a system and method for detecting parameters of a battery pack, and relates to the technical field of battery detection. The system for detecting parameters of the battery pack comprises a to-be-detected battery pack, an auxiliary unit, EIS detection equipment and a switch unit, wherein the auxiliary unit is suitable for forming a series system with the battery pack to be tested; the switch unit is used for controlling the direction of current; and the EIS detection equipment is used for being connected with the auxiliary unit in series and achieving parameter detection of the auxiliary unit, and the EIS detection equipment is further used for being connected with the series system in series and achieving parameter detection of the series system, so that equivalent circuit parameters of the to-be-tested battery pack are determined according to the equivalent circuit parameters of the auxiliary unit and the overall circuit parameters of the series system. According to the technical scheme, the high open-circuit voltage of the to-be-detected battery pack can be offset, so that common EIS detection equipment can detect the equivalent circuit and parameters of the high-voltage and high-capacity battery pack.
Description
technical field [0001] The present invention relates to the technical field of battery detection, in particular, to a system and method for parameter detection of battery packs. Background technique [0002] As relatively mature energy storage devices, batteries and lithium batteries are widely used in electric energy storage systems, electric vehicles, electric bicycles, consumer electronics and other fields. In order to characterize battery characteristics and screen out products with excellent performance in use, the detection of battery cell performance is very important. Eliminate performance degradation or failure products, a necessary process for the batch use of batteries. [0003] Most of the existing methods realize battery EIS (Electrochemical Impedance Spectroscopy) testing through traditional variable frequency AC sinusoidal excitation or square wave, ladder wave and other excitations, and then evaluate the performance and state of the battery cell. However, s...
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IPC IPC(8): G01R31/367G01R31/396
CPCG01R31/367G01R31/396
Inventor 王圣明王浩然赵旭浩刘博张凯暾
Owner 恒钧检测技术有限公司