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A method for estimating the allowable discharge power of a power battery pack

A technology that allows discharge power and power battery packs. It is applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, and electrical measurement. It can solve the problems of battery over-discharge, battery damage, and failure to consider consistency. The effect of reducing the possibility of over-discharge and accurately predicting the discharge power

Active Publication Date: 2015-10-28
HUIZHOU EPOWER ELECTRONICS
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Problems solved by technology

[0002] At present, the method for estimating the allowable discharge power of the battery pack is relatively simple, mainly based on the temperature T and SOC of the battery pack for power estimation
This method does not consider factors such as the voltage, internal resistance, and consistency of each single battery in the battery pack. When there is an error in the SOC, the internal resistance of the battery increases, and the inconsistency of the battery increases, some batteries may be over-discharged and damaged. Battery

Method used

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Embodiment Construction

[0014] In order to facilitate those skilled in the art to understand, the present invention will be described in further detail below in conjunction with embodiment:

[0015] During the driving of the electric vehicle, the battery management system and the vehicle control unit collect the parameters of the battery pack in real time, and use the method designed in this embodiment to estimate the allowable discharge power of the power battery pack. Specifically, the method includes the following steps:

[0016] SOC / T -35℃ -30℃ -20℃ -10℃ 0℃ 10℃ 20℃ 40℃ 55℃ 5% 0 0 0 0 0 0 0 0 0 10% 0 0 20 40 60 90 120 120 120 20% 0 0 20 50 70 105 200 200 200 30% 0 0 20 60 90 135 400 400 400 40% 0 0 20 80 120 180 500 500 500 50% 0 0 20 110 150 240 600 630 630 60% 0 0 40 120 160 300 600 630 630 70% 0 0 40 140 220 300 600 630 630 80% 0 0 70 140 220 450 630 630 630 ...

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Abstract

The invention relates to a power battery pack allowable discharging power estimation method, which is characterized in that an allowable discharging power value Pset under each temperature T and corresponding system-on-chip (SOC) value when a battery pack is in work is previously measured, a discharging power reference table MAP is formed, and the data is prestored in a battery management system database; and then the allowable discharging power value is obtained by adopting different calculation methods according to the SOC values. By comprehensively considering factors such as internal resistance of the battery pack, the lowest voltage, consistency of the battery pack and the like and segmenting the SOC, the estimation of the battery pack allowable discharging power is more accurate. Moreover, a battery management system can better control the discharging of the battery pack according to the acquired allowable discharging power, the over discharge possibility is reduced, and the battery pack is better protected.

Description

technical field [0001] The present invention relates to an improvement of a method for controlling a battery pack. Background technique [0002] At present, the method for estimating the allowable discharge power of the battery pack is relatively simple, mainly based on the temperature T and SOC of the battery pack for power estimation. This method does not consider factors such as the voltage, internal resistance, and consistency of each single battery in the battery pack. When there is an error in the SOC, the internal resistance of the battery increases, and the inconsistency of the battery increases, some batteries may be over-discharged and damaged. Battery. Contents of the invention [0003] In view of this, the technical problem to be solved by the present invention is to provide a comprehensive consideration of the battery pack, temperature, SOC value, voltage, internal resistance, and the consistency factors of each battery cell, and accurately estimate the allow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36H01M10/44
CPCY02E60/10
Inventor 刘飞文锋阮旭松张金灵
Owner HUIZHOU EPOWER ELECTRONICS
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