Battery pack capacity equilibrium method

An equalization method and technology of battery packs, applied in battery circuit devices, secondary battery repair/maintenance, secondary battery charging/discharge, etc., can solve the problems of over-balanced and difficult battery packs

Active Publication Date: 2013-12-04
BEIJING KEY POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the voltage-based equalization algorithm and the state-of-charge-based equalization algorithm is that the goal is to have the same voltage or state of charge, and due to the lack of information on the capacity of the battery ce

Method used

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Example Embodiment

[0027] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0028] Such as figure 1 Shown is a flowchart of a method for equalizing the capacity of a battery pack according to an embodiment of the present invention. The battery pack includes N battery cells and includes the following steps:

[0029] S1: Record the charging voltage curve of each battery cell in the battery pack during the charging process.

[0030] The core idea of ​​the present invention is based on the assumption of the consistency of the charging voltage curve of the battery cells. It is believ...

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Abstract

The invention provides a battery pack capacity equilibrium method. The battery pack capacity equilibrium method comprises the steps of recording a charging voltage curve of each single battery in a battery pack; recording the moment that voltage of one single battery reaches to pre-charging cut-off voltage Um as the full-charging moment t0 of the battery pack, and marking the single battery as a single battery 1; recording the voltage of other N-1 single batteries which do not reach the pre-charging cut-off voltage Um at the full-charging moment t0; calculating an estimated value of residual charging time; calculating estimated residual charging electric quantity of the N-1 single batteries; calculating equalizing current IE of an ith single battery according to the estimated residual charging electric quantity CRC of the ith single battery; performing equalization operation. By using the battery pack capacity equilibrium method, all of single batteries can achieve full-charging voltage after the battery pack is equalized, accordingly full equalization of the battery pack is achieved, and the capacity of the battery pack tends to maximum utilization.

Description

technical field [0001] The invention belongs to the technical field of power batteries for vehicles, and in particular relates to a battery pack capacity equalization method. Background technique [0002] In the functional system of pure electric vehicles, due to the limitation of the voltage and capacity of single lithium batteries, hundreds of battery cells must be connected in series and parallel to form a battery pack to provide sufficient power and energy for pure electric vehicles to meet their acceleration and climbing. and mileage requirements. If there is no difference between battery cells, then the battery pack and battery cells of a pure electric vehicle are consistent in terms of service life and safety. However, due to the inconsistency of the manufacturing process and the inconsistency of the use process environment, there is always inconsistency between battery cells. After the battery cells are grouped, their energy density, durability, and safety performa...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/44
CPCY02E60/12Y02E60/10
Inventor 郑岳久欧阳明高卢兰光李建秋
Owner BEIJING KEY POWER TECH
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