Battery passive balancing method based on master-slave mode

A passive equalization and charge equalization technology, which is applied in charge equalization circuits, electric vehicles, battery circuit devices, etc., can solve the problems of effect deviation and low efficiency, and achieve the effects of convenient optimization, accurate equalization statistics, and accurate equalization mark capacity value

Active Publication Date: 2019-04-12
浙江高泰昊能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with active equalization, passive equalization has the advantages of strong security, high reliability, simple circuit, low cost, and convenient management, but there are problems such as low efficiency or effect deviation

Method used

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  • Battery passive balancing method based on master-slave mode
  • Battery passive balancing method based on master-slave mode
  • Battery passive balancing method based on master-slave mode

Examples

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Embodiment 1

[0046] A battery passive equalization method based on a master-slave mode, including full-range equalization control, and the full-range equalization control includes the following steps:

[0047] (1-1) After the battery master control and battery slave control in the battery management system are powered on and self-inspected, the battery management system enters the normal working state;

[0048] (1-2) The main control of the battery judges the open-circuit resting time of the battery. Under normal circumstances, the open-circuit resting time of the battery is 40 minutes;

[0049] (1-3) The battery master judges other balance judgment conditions and confirms whether the balance judgment conditions are satisfied. The battery slave controller calculates the marked capacity value of each cell that needs to be balanced by formula (a), that is, the full balance capacity value,

[0050] Qbalance(i)=(SOC(i)–SOCObj)*Qmax(i) (a);

[0051] Among them, Qbalance(i) is the whole process...

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Abstract

The invention discloses a battery passive balancing method based on a master-slave mode, and the method has whole-course balancing control which comprises the following steps: a battery management system enters a normal working state after the battery master and the battery slave power-on self-testing in the battery management system is completed; battery master determines battery open circuit standing time; the battery master determines other balancing determination conditions and confirms whether the balancing determination conditions are satisfied. The open-circuit OCV curve is used to calculate the balancing mark capacity. Based on the actual capacity of each unit instead of the general battery capacity, the error is eliminated to calculate the exact balancing capacity value, and the balancing real-time time time efficiency and balancing current are introduced into the balancing control to reduce the statistical error of the balancing capacity. The master of the invention uniformlymanages and distributes the balancing target value, and the slave receives and transforms the balancing mark capacity value to carry out the balancing control, so that the whole system is balanced and uniform, the balanced calculation and distributed calculation are carried out, and the main control resources are occupied less.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a battery passive balancing method based on a master-slave mode. Background technique [0002] At present, the state has invested a lot of financial and material resources to support the development of new energy electric vehicles, making the rapid development of new energy electric vehicles into the homes of ordinary people, which is also inseparable from the continuous optimization and research and development support of battery management systems. The battery management system is responsible for the detection of the total voltage and current of the battery system and the voltage and temperature of the single cell for ternary, lithium iron phosphate and other lithium material batteries. The more important function is the accurate estimation of SOC, SOH, SOE, etc. The body balance management scheme ensures the normal charging and discharging of lithium batteries, a...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0016H02J7/0019
Inventor 程亚兵储龙
Owner 浙江高泰昊能科技有限公司
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