Battery charging and discharging parameter identification method and system for electric vehicle

A technology for charging and discharging parameters and electric vehicles. It is applied in the direction of measuring electricity, measuring electrical variables, and measuring devices. It can solve the problems of low implementability and poor operability, so as to save energy, improve utilization, and avoid large currents. impact effect

Active Publication Date: 2018-06-12
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a battery charge and discharge parameter identification method and system for electric vehicles, aiming to solve the problem that the traditional battery charge and discharge parameter identification method can only be used for offline testing, poor operability, and low implementability

Method used

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  • Battery charging and discharging parameter identification method and system for electric vehicle
  • Battery charging and discharging parameter identification method and system for electric vehicle
  • Battery charging and discharging parameter identification method and system for electric vehicle

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Embodiment 1

[0031] See Figure 1-3 The connection of the battery charging and discharging parameter identification system of the electric vehicle in the embodiment of the present invention with the battery BT and the bus capacitor C is based on a battery management system (Battery Management System, BMS). The battery management system may be vehicle-mounted, which includes the battery status Basic functions such as detection (current, voltage, temperature), battery status analysis, battery safety protection, energy control management, and battery information management.

[0032] To facilitate the description of the embodiments of the present invention, such as figure 2 As shown, this embodiment takes the bus capacitor C of the motor controller as an example, and during the application of the battery charge and discharge parameter identification system, it is actually connected to the bus capacitors of each on-board equipment, that is, the bus capacitor C is the motor controller, electric The...

Embodiment 2

[0045] See Figure 4 with Figure 5 In this embodiment, the charging and discharging module 10 further includes an inductor L1, a first power tube Q1, a second power tube Q2, a second switch K2, a third switch K3, and a fourth switch K4.

[0046] The fourth switch K4 is connected in series on the bus circuit 100, the first end of the second switch K2 is connected to the common end of the first switch K1 and the fourth switch K4, the second end of the second switch K2, the first power tube Q1 and The second power tube Q2 is connected in series between the second terminal of the second switch K2 and the negative electrode of the battery BT; the first terminal of the inductor L1 is connected to the common terminal of the first power tube Q1 and the second power tube Q2, and the inductor L1 The second end is connected to the positive electrode of the battery BT through the third switch K3, the fourth switch K4, and the first switch K1 in turn; the first power tube Q1, the second power...

Embodiment 3

[0051] Image 6 The implementation process of the method for identifying battery charging and discharging parameters of an electric vehicle provided by an embodiment of the present invention is shown. For ease of description, only the parts related to the embodiment of the present invention are shown, which are detailed as follows:

[0052] In step S601, when the discharge parameter identification of the battery of the electric vehicle is received, the voltage of the bus capacitor of the electric vehicle is detected;

[0053] In step S602, when the voltage of the bus capacitor is less than the preset HPPC discharge test threshold, the bus circuit of the electric vehicle is disconnected to prepare for precharging the bus capacitor;

[0054] In step S603, the discharge current of the battery is controlled by the pre-charge and discharge module of the electric vehicle to obtain a preset discharge test current working condition, and the bus capacitor is precharged through the preset disch...

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Abstract

The invention provides a battery discharging parameter identification method and system for an electric vehicle. The method includes the steps that when a discharging parameter of the electric vehicleis recognized, a bus capacitor voltage of the electric vehicle is detected; when the voltage is less than a preset HPPC discharging test threshold, a bus circuit of the electric vehicle is turned offto prepare pre-charging for a bus capacitor; the discharging current of a battery is controlled through a pre-charging and discharging module of the electric vehicle to obtain a preset discharging test current condition, and the bus capacitor is pre-charged through the preset discharging test current condition; HPPC discharging test is carried out on the battery through the discharging test current condition, voltage and current change data of the battery is collected online, then the discharging parameter of the battery is obtained, and thereby on-line recognition of the discharging parameter of the battery is realized. The battery discharging parameter identification method and system for the electric vehicle have the advantages that the test process of charging and discharging parameters of the battery and the corresponding test system are simplified, the operability is strong, at the same time, the service life of the bus circuit is prolonged, and the energy consumption during testing is reduced.

Description

Technical field [0001] The present invention relates to the technical field of battery management, in particular to a method and system for identifying battery charging and discharging parameters of electric vehicles. Background technique [0002] Electric vehicle power battery requires charge and discharge parameter identification, while traditional electric vehicle power battery charge and discharge parameter identification requires Hybrid Pulse Power Characteristic (HPPC) experiments. When performing HPPC experiments, pulses need to be set. Charge and discharge current value and discharge time, obtain the data of the sudden change of the instantaneous charge and discharge voltage and the data of the slow change of the voltage during constant current charging and discharging or electric standing, put the data into the set fitting function, and rely on the regression optimization algorithm Find the coefficients of the fitting function, and finally identify the battery charge and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/388
Inventor 梁嘉宁石印洲孙天夫林定方谭霁宬李文文
Owner SHENZHEN INST OF ADVANCED TECH
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