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A battery power limit protection method and system based on battery safety voltage

A battery voltage and safety voltage technology, applied in battery circuit devices, charging/discharging current/voltage regulation, collectors, etc., can solve problems such as high battery voltage, failure to operate, and faulty vehicles

Active Publication Date: 2019-12-10
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a battery power limit protection method and system based on the battery safety voltage to solve the problem of fault alarms and vehicle failures caused by battery voltage being too high or too low in pure electric or hybrid vehicles due to limited battery power. Problems that don't work

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  • A battery power limit protection method and system based on battery safety voltage
  • A battery power limit protection method and system based on battery safety voltage
  • A battery power limit protection method and system based on battery safety voltage

Examples

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Embodiment 1

[0071] Please refer to the attached figure 1 , figure 1 It is a schematic flowchart of a battery power limit protection method based on battery safety voltage provided by an embodiment of the present invention. Such as figure 1 As shown, the present invention discloses a battery power limit protection method based on battery safety voltage, specifically the method includes the following steps:

[0072] S101. Determine the real-time running state of the battery, where the real-time running state is a charging state or a discharging state.

[0073] Under the working state of the battery, the voltage is basically stable, and the voltage change value under the charging and discharging conditions is generally within the safe threshold range. However, when the battery discharge power is not enough, if the load output power is too large, the battery voltage will drop rapidly. As a result, the total voltage of the high-voltage system of the vehicle may be too low, causing high-volta...

Embodiment 2

[0083] Please refer to the attached figure 2 , figure 2 For the embodiment of the present invention figure 1 A schematic diagram of the specific flow of step S103 when the real-time running state is the discharging state. Such as figure 2 As shown, in step S103, when the real-time operating state is a discharging state, determining the actual working power according to the operating parameters, the lower limit of the safety voltage and the reference value, this step specifically includes the following steps:

[0084] S201. Obtain battery voltage parameter value U and current parameter value I Dschr And the battery discharge power limit value P provided by the BMS battery management system DschrLim .

[0085] S202. Determine whether the battery voltage parameter value U is less than or equal to the safe voltage lower limit value U Lowlim .

[0086] S203. When the battery voltage parameter value U is less than or equal to the safety voltage lower limit value U Lowlim ...

Embodiment 3

[0090] Please refer to the attached image 3 , image 3 For the embodiment of the present invention figure 1 A schematic diagram of the specific flow of step S103 when the real-time running state is the discharging state. Such as image 3 As shown, in step S103, when the real-time operating state is a discharging state, determining the actual working power according to the operating parameters, the lower limit of the safety voltage and the reference value, this step specifically includes the following steps:

[0091] S301. Obtain battery voltage parameter value U and current parameter value I Chr And the battery charging power limit value P provided by the BMS battery management system ChrLim ;

[0092] S302. Determine whether the battery voltage parameter value U is greater than or equal to the safe voltage upper limit value U Uplim ;

[0093] S303. When the battery voltage parameter value U is greater than or equal to the safe voltage upper limit value U Uplim , acco...

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Abstract

The invention discloses a battery power limitation protection method and system based on battery safety voltage. The method specifically comprises the steps of determining that a real-time operation state of a battery is a charge state or a discharge state; obtaining operation parameters of the battery and reference values provided by a BMS (Battery Management System) battery management system in real time according to the real-time operation state of the battery; determining the actual work power of the charge state or the discharge state according to the operation parameters, the upper limit and the lower limit of the threshold range of the safety voltage and the reference values; controlling the battery to normally work in the threshold range of the safety voltage according to the actual work power. The actual charge-discharge power of the battery can be calculated out according to the parameters such as real-time voltage and current of the battery, the work state parameters of the battery voltage are protected to be normal and are prevented from being affected by the reference values provided by the BMS, the battery state is protected in real time, the extreme work state of the battery is reduced, the problems that faults are reported due to too high voltage or too low voltage of the battery and the vehicle cannot travel, caused by limited battery power are solved, and the reliability of whole-vehicle power system is improved.

Description

technical field [0001] The invention belongs to the technical field of power battery management, and more specifically relates to a battery power limit protection method and system based on battery safety voltage. Background technique [0002] For pure electric vehicles or hybrid vehicles, under the condition of motor drive or power generation, the battery is used as the power source to output or recycle electric energy. The battery management system collects battery parameters, monitors the battery status, and controls the charging and discharging power of the battery to achieve the purpose of protecting and limiting the working status of the battery. BMS (Battery Management System, power battery management system) conducts test calibration in the laboratory environment, and uses the test environment chamber equipment to simulate the battery at different temperatures and different SOC (State of Charge power battery state of charge), the battery will be charged within 10 sec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
CPCH02J7/007
Inventor 王丽伟房永郗富强冯美丽
Owner WEICHAI POWER CO LTD