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All-condition passive equalization algorithm for quantizing a power battery pack

A power battery pack and passive equalization technology, which is applied in electric traction, electric vehicles, vehicle energy storage, etc., can solve the problems of time-consuming and labor-intensive use, and can not develop the potential of battery cells, so as to achieve the effect of improving the balance effect

Active Publication Date: 2018-12-18
TIANJIN YIZHONGTENG POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The previous equalization algorithm is often to equalize the cell voltage under specified conditions, which is time-consuming and laborious, and cannot develop the maximum potential of the battery

Method used

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  • All-condition passive equalization algorithm for quantizing a power battery pack

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Embodiment Construction

[0022] The specific implementation manner of the present invention will be further described in detail through the description of the best embodiment below.

[0023] The present invention provides a full working condition passive equalization algorithm for power battery pack quantization, including the following steps:

[0024] Step 1. Use the on-board charger or charging pile to charge the battery pack with the set charging current value I. If the following conditions are met, proceed to Step 2:

[0025] The ΔQ flag in the EEPROM of the battery management system is invalid;

[0026] The vehicle maintains constant current charging until the voltage reaches a stable level;

[0027] During the charging process, the lowest temperature of the power battery system is greater than the inflection point T of the discharge capacity temperature of the single battery min ;The maximum temperature difference of the power battery system is less than T diff ;

[0028] The T diff It is t...

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Abstract

The invention discloses an all-condition passive equalization algorithm for quantizing a power battery pack, includes using vehicle-mounted charger or charging pile to charge the power battery stack at constant current, judging whether the battery stack meets the preset equalization allowable condition, and simultaneously recording the capacity difference and the cell number to start the equalization of the power battery unit satisfying the equalization opening condition; The single cell with higher usable capacity consumes the tolerance between cells through balancing resistors, so that the usable remaining capacity of the whole power battery system is consistent. When the tolerance between cells is less than the preset value, the equalization circuit is disconnected and the next equalization cycle is entered. The invention realizes the quantitative balance of the battery system, reduces the influence of the internal resistance of the battery cell on the usable capacity of the system,increases the usable energy of the battery system, and ensures the service life of the battery system.

Description

technical field [0001] The invention relates to a passive equalization algorithm in a battery management system of an electric vehicle. Background technique [0002] As the country's investment in electric vehicles continues to increase, electric vehicle technology has developed rapidly. The equalization effect plays a decisive role in the battery life and cruising range of electric vehicles. The previous equalization algorithm is often to equalize the cell voltage under specified conditions, which is time-consuming and laborious, and cannot develop the maximum potential of the battery. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the prior art, and provide a passive equalization algorithm for power battery pack quantization in all working conditions, so that the battery management system can turn on the equalization in any state, so that the battery cells in the battery system are in the same state when they a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L11/18
CPCB60L2240/547Y02T10/70
Inventor 杨永超张建昌尹志学兰悦鹏冷喜容
Owner TIANJIN YIZHONGTENG POWER TECH