A battery pack matching method for pure electric vehicles based on consistency index
A pure electric vehicle and matching method technology, applied in the field of battery management, can solve problems such as the efficiency that affects the balance, the balance and matching of the remaining single cells, etc., to achieve the effect of prolonging the service life and increasing the single discharge time
Active Publication Date: 2017-01-11
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
However, this method only processes the cells that need to be balanced most, whose voltage is lower than the minimum discharge voltage, and does not balance and match the remaining cells, which affects the efficiency of balancing. When the number of cells that most need to be balanced is small, This method is difficult to play a large role
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[0034] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0035] Take the 2×2 battery pack as an example, the battery uses Poppas18650 battery, the battery capacity is 2400mAh, the rated voltage is 3.7V, the termination voltage is 2.75V, and the saturation voltage is 4.2V.
[0036] This embodiment provides a matching method based on a battery consistency index, and the method includes the following steps:
[0037] Step 1, such as figure 1 , build the experimental circuit, the current sensor uses the WCS2702 Hall sensor (the linearity of the sensor is 1m...
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The invention provides a battery pack matching method for pure electric vehicles based on a consistency index, comprising: step 1, obtaining the operating characteristic curve of a single battery in the battery pack through test measurement; step 2, determining the battery connection in the battery pack according to the consistency index method; step 3, according to the measured parameters of each single battery, estimate its capacity and real-time SOC; step 4, according to the relationship between the best discharge current and capacity of the battery, determine the matching scheme of the battery block level; step 5, by the battery The SOC parameters at the block level determine the matching scheme of the battery pack slice level; step 6, update the operating voltage of each single battery and the total voltage of the slice level in real time, and change the number of slice levels according to the voltage required to maintain the operation of the electric vehicle. The invention is used for battery pack matching based on consistency index during pure electric vehicle driving, which is beneficial for the battery pack to work in a more suitable discharge environment, increases the battery discharge time, and prolongs the service life of the battery.
Description
technical field [0001] The invention relates to the field of battery management, in particular to a matching method for battery packs of pure electric vehicles based on a consistency index. Background technique [0002] The battery technology of pure electric vehicles is the key to the development of electric vehicles. In the case of no qualitative leap in the performance of battery cells, how to improve the performance of battery packs through scheduling measures is very necessary. Taking lithium battery packs as an example, the battery packs of existing electric vehicles usually contain a large number of lithium battery cells. service life. [0003] The inconsistency of performance between battery cells is manifested in the inconsistency of battery cell capacity, internal resistance, voltage and current. Practice has shown that matching battery packs based on the inconsistency of battery cell performance can help improve the overall performance of the battery pack. The...
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IPC IPC(8): H01M10/04H01M10/42
CPCH01M10/4207H01M2220/20Y02E60/10Y02P70/50
Inventor 张翔袁景淇成宝琨
Owner SHANGHAI JIAOTONG UNIV