A hibernation method for a battery management system of a new energy vehicle

Abstract

The present invention proposes a dormancy method for a battery management system of a new energy vehicle. The method includes: when the BMS of the battery management system satisfies the first preset dormancy condition, judging whether there is an abuse operation mode on the vehicle, and if so, the BMS will enter Standby mode until the vehicle controller VCU enters the dormancy state; if it does not exist, the BMS sends a preparation dormancy request to the VCU, at this time, it is judged whether the second preset dormancy condition is satisfied, and if so, the BMS sends a request to the VCU. The VCU sends an emergency dormancy command, and the BMS enters dormancy. If not, the BMS is controlled to enter dormancy based on whether the VCU allows the BMS to dormant. Beneficial effects of the present invention: BMS dormancy control is coupled with VCU dormancy control, which can complete dormancy control more reasonably; supports the delayed power-off function of the whole vehicle; warns the VCU when a fault is dormant, and the VCU can reduce safety risks by adjusting the driving mode; prevents excessive operation control.

Description

technical field [0001] The invention relates to the field of new energy vehicle battery management, in particular to a dormancy method for a new energy vehicle battery management system. Background technique [0002] In the existing products, the sleep mode of the new energy battery management system (hereinafter referred to as BMS) is divided into: [0003] Normal sleep: fast charge wake-up signal, slow charge wake-up signal and vehicle power-on signal are processed. Once all the signals fail, the BMS will be activated to enter the sleep process immediately, and during this process, important data related to the battery (such as accumulated charge and discharge quantity, SOC and other signals) power off after storage; [0004] Fault dormancy: For serious faults (such as insulation abnormalities), the BMS immediately enters the dormancy process, and stores important battery-related data (such as accumulated charge and discharge, SOC, etc.) during the process and then powers...

AI Technical Summary

Problems solved by technology

[0005] However, there are the following disadvantages in the prior art: 1. Whether the vehicle is allowed to sleep when the BMS is in sleep is not considered; 2. It cannot support the delayed power-off function of the vehicle controller (VCU for short); 3. There is no early warning notification to the VCU when the fault is in sleep , so that the VCU cannot reduce the safety risk by adjusting the driving mode; 4. No abuse operation protection, the whole vehicle has potential safety hazards

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