Control method for balancing charging according to battery voltage

A charge equalization and battery voltage technology, which is applied in battery circuit devices, current collectors, electric vehicles, etc., can solve the problems of increased difficulty in controlling energy transfer circuits, and achieve the effect of easy promotion and use

Active Publication Date: 2014-01-22
HUIZHOU EPOWER ELECTRONICS
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Problems solved by technology

Each method has its own limitations. For example, due to the limitation of heat dissipation conditions in the resistance shunt equalization method, the shunt current does not exceed 100mA; the energy transfer equalization method doubles the energy transfer circuit and its control difficulty with the increase in the number of batteries connected in series. , especially when the power battery components are installed in multiple boxes

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  • Control method for balancing charging according to battery voltage

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Embodiment Construction

[0019] In order to facilitate the understanding of those skilled in the art, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments:

[0020] According to the control method for charging equalization based on battery voltage disclosed in the present invention, the charging includes a constant current charging stage and a constant voltage charging stage. Specifically, the single batteries in the battery pack are divided into multiple groups of series-connected batteries, and each group is connected in series The battery consists of 8-12 cells, consisting of a figure 1 The charging balancing power supply shown performs charging balancing. The charging balancing power supply circuit includes a transformer, and the transformer is provided with a plurality of charging secondary sides suitable for charging each series battery pack. The voltage generated by the charging secondary side is filtered by a limiter. The...

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Abstract

The invention discloses a control method for balancing charging according to battery voltage. The control method comprises a constant-current charging stage and a constant-voltage charging stage in sequence, and comprises the following specific steps: after previous charging is finished, estimating durations required by charging balance of all single batteries during current charging according to difference values between the voltages of all single batteries and a highest single battery voltage, and saving; at the constant-current charging stage of the current charging, performing charging balance on a single battery of which the duration required by charging balance is longest; at the constant-voltage charging stage of the current charging, performing charging balance on a single battery of which the voltage is lowest. According to the method, the duration of the current charging balance is estimated by fully utilizing the situation of voltage difference after previous full charging of a battery pack, balance is performed at the constant-current stage of the current charging process according to the duration, and balance is also performed at a constant-voltage current-reducing stage according to a lowest voltage, so that energy maximization is ensured after full charging of a battery pack of a pure electric automobile.

Description

technical field [0001] The invention relates to the field of battery charging, in particular to a control method for charging equalization based on battery voltage. Background technique [0002] An important parameter when using a pure electric vehicle is its current mileage, which directly limits the user's use time of the car and affects the user's experience. An important direction of efforts in the current industry is to increase the driving range of pure electric vehicles, and the direct factor affecting the driving range is the remaining energy of the power battery pack. The pure electric vehicle power battery pack is composed of multiple batteries connected in series. Due to the inconsistency between the batteries, when the power battery pack is fully charged, there must be a battery with the highest voltage and a battery with the lowest voltage. In order to protect the power battery during the actual operation of the vehicle, when charging, the battery with the high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 刘飞文锋阮旭松徐志深
Owner HUIZHOU EPOWER ELECTRONICS
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