Battery discharge off-state judgment method for vehicle-mounted battery management system
A technology of battery discharge and management system, applied in secondary battery charging/discharging, secondary battery repair/maintenance, measurement of electricity, etc., can solve the problems of seldom use and complicated process, and achieve the effect of accurate judgment and simple realization
Active Publication Date: 2013-06-12
CHERY AUTOMOBILE CO LTD
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Problems solved by technology
In addition to continuously recording the historical data of battery charge and discharge, this method also needs to correct the capacity of discharge current, battery aging, self-discharge, etc. The process is complicated and is generally rarely used.
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[0029] Through the analysis of battery discharge characteristics and test data, it can be seen that the termination point of battery discharge should refer to the place where the battery voltage drops more sharply when the battery discharges unit capacity. That is to say, the battery voltage has to drop a lot in order to release the equivalent capacity that can be released by a small voltage drop during the voltage drop plateau period. From a theoretical analysis, it is not very appropriate to use the slope dV / dt of the "V-t curve" of the constant current discharge of the battery to measure the termination of the discharge. Because the termination voltage of the discharge is closely related to the magnitude of the discharge current, the value of the current should be added to it. Factors, it is possible to correctly determine the termination state. This leads to a new method to judge the discharge termination state of the battery - the voltage / capacity gradient method.
[0030...
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The invention discloses a battery discharge off-state judgment method for a vehicle-mounted battery management system, and the method comprises the following steps: 1, determining a discharge constant Ck according to the type of the battery, wherein Ck=dV / dC, the dV / dC is the discharge V-C curve slope of the battery, namely the curve slope of the voltage V which be changed along with the discharge capacity C, Ck is the slope value of the large slope change when the electric quantity C of the battery is nearly discharged, Ck is a constant which is comprehensively defined according to the discharge multiplying power voltage change condition of the battery; 2, detecting the terminal voltage of a vehicle-mounted dynamic battery pack and the current of a battery package in real time, and acquiring the numerical value of the dV / dC; and 3, when the battery management system detects that the absolute value of the dV / dC is larger than or equal to the Ck, judging that the battery is in a discharge off-state. By utilizing the method provided by the invention, the discharge off-state can be judged by utilizing a single discharge constant with no need of a battery pressure platform. The methoddisclosed by the invention has the advantages of accurate and practical judgment and simplicity in realization.
Description
technical field [0001] The invention belongs to the technical field of vehicle-mounted power source management, and in particular relates to a control method for an important parameter SOC of a vehicle-mounted power battery of a hybrid vehicle and a pure electric vehicle. Background technique [0002] Petroleum, as the power source of traditional automobiles, is not only expensive due to the dwindling reserves, but also the exhaust gas produced by its combustion has caused environmental pollution and increased greenhouse gas emissions. Therefore, hybrid electric vehicles and pure electric vehicles, which use electric energy as part or all of the power source, emerge at the historic moment, and gradually move towards the mainstream automobile market. [0003] Traction battery is one of the power sources of hybrid electric vehicles (HEV), and its main performance indicators include specific energy, specific power and service life. At present, one of the key factors restrictin...
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IPC IPC(8): H01M10/44G01R31/36
CPCY02E60/12Y02E60/10
Inventor 王章才
Owner CHERY AUTOMOBILE CO LTD