Electric vehicle and state of energy SOE computation method and device of power battery
A power battery and energy state technology, applied in the direction of measuring devices, measuring electrical variables, measuring electricity, etc., can solve problems such as large estimation errors, inability to effectively correspond to external power, and inability to accurately simulate voltage changes, achieving the effect of high accuracy
Active Publication Date: 2019-10-15
BYD CO LTD
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Problems solved by technology
[0004] However, under the same SOC state, there is a big difference in the discharge capacity of the power battery under different working conditions, that is, under the allowable discharge rate of the power battery, the total energy released increases with the increase of the rate.
At the same time, the current state of the power battery represented by SOC cannot effectively correspond to the external power, and the voltage change of the power battery terminal in actual operation cannot be accurately simulated, making it difficult to provide accurate prediction conditions for driving range and battery life. large estimation error
Moreover, the SOC cannot reflect the current moment of the power battery and the influence of the previous charging and discharging conditions. The existing look-up table method increases the error of SOE, which directly leads to inaccurate estimation of the driving range.
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[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0034] The SOE calculation method and device of the power battery and the electric vehicle according to the embodiments of the present invention will be described below with reference to the accompanying drawings.
[0035] figure 1 It is a flowchart of a method for calculating the state of energy SOE of a power battery according to an embodiment of the present invention. Such as figure 1 As shown, the energy state SOE calculation method of the power battery includes the following steps:
[0036] S101. Obtain an open circuit vo...
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The invention discloses an electric vehicle and a state of energy SOE computation method and device of a power battery. The method comprises the following steps: acquiring an open-circuit voltage OCV-battery capacity Q reference curve of the power battery; acquiring the OCV of the power battery; acquiring the current remaining available capacity of the power battery according to the OCV and OCV-Qreference curve of the power battery; and computing the SOE of the power battery according to the current remaining available capacity and the OCV of the power battery. The SOE computation method of the power battery firstly acquires the OCV-Q reference curve and then acquires the OCV, and then obtains the remaining capacity Qremaining of the power battery according to the OCV and OCV-Q referencecurve, and finally computes the SOE according to the Qremaining and OCV; therefore, the SOE is directly computed through the capacity and the open-circuit voltage, and more conforms to the scientificprinciple, and the computed SOE accuracy is higher.
Description
technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a method for calculating the state of energy SOE of a power battery, a device for calculating the state of energy SOE of a power battery, and an electric vehicle. Background technique [0002] Due to the dual pressure of energy and environment, electric vehicles are developing rapidly, and power batteries, as the energy storage source of electric vehicles, directly determine the driving range of electric vehicles. [0003] In order to more accurately measure the remaining power of the power battery, K. Mamadou et al. proposed the concept of battery SOE (State of Energy, energy state), which can be used to represent the percentage of the remaining energy of the power battery. In related technologies, when calculating SOE, the relationship curve between battery OCV and SOE is measured in advance under laboratory conditions, and then the BMS (Battery Management System, bat...
Claims
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Login to View More IPC IPC(8): G01R31/367G01R31/387
CPCG01R31/367G01R31/387G01R31/36
Inventor 邓林旺冯天宇林思岐吕纯杨子华
Owner BYD CO LTD