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A method for estimating the available discharge and regenerative power of a battery
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A discharge power and battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problem that the available power of the battery cannot effectively exert the potential of the battery, and achieve the effect of improving the experience and improving the recycling efficiency.
Active Publication Date: 2021-03-23
安徽优旦科技有限公司
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[0008] Aiming at the problem that the existing inaccurate estimation causes the available power of the battery to be unable to effectively utilize the potential of the battery, the present invention provides a method for estimating the available discharge and feedback power of the battery
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Embodiment 1
[0090] A method of estimating the regenerative power available to the battery, such as figure 1 shown, including the following steps:
[0091] Collect the SOC-continuous discharge power curve and SOC-peak discharge power curve at different temperatures through the battery experiment;
[0092] Use MATLAB / Simulink software to carry out SOC model and SOP at a given temperature, build SOC model and SOP model in MATLAB software, SOC model outputs SOC to SOP model for table lookup, and SOP model outputs discharge or feedback power to SOC for integral use , the two are jointly simulated to obtain the data results.
[0093] Calculate the discharge recovery energy and discharge warning energy of the battery;
[0094] The discharge recovery energy is the highest dischargeable energy of the battery required for continuous discharge power (if it is higher than this value, it will be discharged at the peak value), and the discharge warning energy is the minimum dischargeable energy of th...
Embodiment 2
[0147] A method of estimating the battery feedback power, where the feedback power is the switching value of the continuous feedback power and the peak feedback power, such as figure 2 shown, including the following steps:
[0148] S1. SOC-sustained discharge power curves and SOC-peak discharge power curves at different temperatures are collected through the PACK experiment;
[0149] S2. Use MATLAB / Simulink to build SOC models and SOP models and perform simulations to establish SOC-battery initial energy feedback curves at different temperatures;
[0151] In the formula: FBCapInit represents the initial energy that can be fed back by the battery, FBMaxPwr init Indicates the peak feedback power obtained through the SOC-peak feedback power curve at real-time temperature, and T indicates the duration of the peak feedback power.
[0152] S3. Calculate the feedback recovery energy and feedback warning energy of the ba...
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Abstract
The invention discloses a method for estimating the available discharge of a battery and a method for estimating the available feedback power of the battery and belongs to the field of automobile batteries. The method for estimating the available discharge power of the battery includes the following steps that: an SOC-continuous discharge power curve and an SOC-peak discharge power curve are collected; an SOC-battery initial available discharge energy curve is established; the discharge recovery energy and discharge warning energy of the battery are calculated; the maximum available dischargeenergy of the battery is calculated; and the available discharge power of the battery is estimated. The method for estimating the available feedback power of the battery includes the following steps that: an SOC-continuous feedback power curve and an SOC-peak feedback power curve are collected; an SOC-battery initial available feedback energy curve is established; the feedback recovery energy andfeedback warning energy of the battery are calculated; the maximum available feedback energy FBCapLeft of the battery is calculated; and the available feedback power of the battery can be estimated. With the method for estimating the available discharge of the battery and the method for estimating the available feedback power of the battery of the invention adopted, the potential of the battery can be given to full play with the safety and service life of the battery ensured; available power can be provided; user experience can be effectively improved; and the recovery efficiency of braking energy can be improved.
Description
technical field [0001] The invention belongs to the field of automobile batteries, and in particular relates to a method for estimating the battery's available discharge and feedback power. Background technique [0002] A power battery is a device that converts chemical energy into electrical energy. The conversion process is a complex physical and chemical reaction process. Calculating the available power of a power battery is of great significance to the power and energy recovery of the battery. [0003] Available power (State of Power, SOP) indicates the available energy of the battery per unit time, and is used to reflect the ability of the battery to output and feed back power. If the battery is continuously discharged at high power, the temperature of the battery will rise rapidly, and overheating will damage the internal structure of the battery. Low-power discharge will seriously affect the user's dynamic experience, such as slow acceleration, difficult climbing, an...
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