Dormancy method for new energy vehicle battery management system

Abstract

The invention puts forward a dormancy method for a new energy vehicle battery management system. The method comprises the following steps that: when a BMS (battery management system) meets a first preset dormancy condition, judging whether an excessive operation mode is in the presence on a vehicle or not; if the excessive operation mode is in the presence on the vehicle, the BMS enters a standbymode until a situation that a VCU (vehicle control unit) enters a dormancy state is obtained; and if the excessive operation mode is not in the presence on the vehicle, the BMS sends a dormancy preparation request to the VCU, at the time, whether a second preset dormancy condition is met or not is judged, if the second preset dormancy condition is met, the BMS sends an emergency dormancy instruction to the VCU, the BMS enters dormancy, and otherwise, the BMS is controlled to enter dormancy on the basis of whether the VCU permits the BMS to enter dormancy or not. The dormancy method has the beneficial effects that the BMS dormancy control and VCU dormancy control are coupled so as to more reasonably finish dormancy control; a vehicle time delay power-off function is supported; during faultdormancy, the VCU is given an early warning, and the VCU can lower a security risk through the regulation of a driving mode; and the control of excessive operation prevention is realized.

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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