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Off-line balancing method

An equalization method and equalization technology, applied in battery/fuel cell control devices, electrical devices, transportation and packaging, etc., can solve problems such as limited equalization time, insignificant equalization effect, and influence on the normal operation of the system, so as to achieve good equalization effect Effect

Active Publication Date: 2022-04-15
CHERY COMML VEHICLE ANHUI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy dissipation circuit used in passive equalization is relatively simple and low in cost, but it consumes a lot of energy, slow in equalization speed, low in efficiency, and the heat dissipation of resistors will affect the normal operation of the system. Limited, the balance effect is not obvious
More importantly, after the battery management system is powered off and sleeps, it will not trigger equalization, which highlights the limitations of passive equalization, and the equalization effect is not obvious

Method used

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Embodiment 1

[0022] Embodiment 1: An off-line equalization method, including: pre-setting the timing wake-up time in the battery management system BMS, starting timing after the vehicle is powered off, and waking up the battery management system host when the timing reaches the set timing wake-up time, the battery After the management system wakes up, it first enters the self-test program. If the self-test fails, the battery management system will be powered off and sleep; if the self-test is passed, it will enter the equalization step, and the power battery will be balanced after the equalization judgment condition is met in the equalization step.

[0023] In the self-inspection program, if any of the conditions of battery management system hardware failure, abnormal cell temperature, and abnormal voltage are met, the self-inspection fails, otherwise the self-inspection passes. After the scheduled start, if the BMS is started directly when there are temperature faults, voltage faults, etc....

Embodiment 2

[0034] The present invention mainly researches that when the battery management system is dormant, the internal acquisition chip of the battery management system wakes up to enable passive equalization. In order to prevent the battery from losing power, the battery management system detects the battery voltage at the same time after the battery management system wakes up, and starts intelligent power replenishment when necessary.

[0035] Set a 1h timing wake-up before the system is powered off to ensure that the battery is completely static, the static pressure difference and SOC are credible, and the startup balance is more accurate. After the vehicle is powered off, sleep for 1 hour to wake up the host, and then the battery management system performs a self-test. If the battery management system fails the self-test, such as battery management system hardware failure, single temperature, voltage, etc., the sleep balance is not allowed. Go to the power-down process at this tim...

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Abstract

The invention discloses an off-line balancing method which comprises the following steps: setting timing wakeup time in a battery management system BMS in advance, starting timing after a whole vehicle is powered off, waking up a battery management system host when the timing reaches the set timing wakeup time, firstly entering a self-checking program after the battery management system is waken up, and if the self-checking is not passed, starting timing after the whole vehicle is powered off. The battery management system is powered off and dormant; and if the self-inspection is passed, entering an equalization step, and equalizing the power battery after an equalization judgment condition is met in the equalization step. The method has the advantages that the set timing starting and BMS are automatically started after the vehicle is powered off, whether equalization needs to be carried out or not is judged, when the conditions are met, equalization can be achieved for a long time after the vehicle is powered off, the equalization effect is better, and meanwhile normal use of a user cannot be affected due to the fact that equalization is carried out after the vehicle is powered off.

Description

technical field [0001] The invention relates to the field of equalization start control of power batteries of electric vehicles, in particular to an off-line equalization method capable of self-starting. Background technique [0002] At present, the power battery system of electric logistics vehicles mostly adopts passive equalization. The energy dissipation circuit used in passive equalization is relatively simple and low in cost, but it consumes a lot of energy, slows down the equalization speed, and has low efficiency, and the heat dissipation of resistors will affect the normal operation of the system. Limited, the balance effect is not obvious. More importantly, after the battery management system is powered off and goes to sleep, it will not trigger equalization, which highlights the limitations of passive equalization, and the equalization effect is not obvious. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/22B60L58/10B60L58/24B60L3/00
CPCY02T10/70
Inventor 张梅赵国华吴磊程斌沈家俊张静雅刘智全
Owner CHERY COMML VEHICLE ANHUI