Energy transfer-based battery equalization control method

A battery balancing and control method technology, applied in battery circuit devices, current collectors, electric vehicles, etc., can solve the problems of different control schemes, low circuit portability, complex control strategies, etc., and achieve the effect of high portability

Inactive Publication Date: 2018-01-16
HEFEI HENGNENG NEW ENERGY TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the cell-battery pack energy transfer equalization scheme can realize the energy transfer between the battery cell and the battery pack through the charge and discharge of t

Method used

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  • Energy transfer-based battery equalization control method
  • Energy transfer-based battery equalization control method
  • Energy transfer-based battery equalization control method

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[0022] To further illustrate the features of the present invention, please refer to the following detailed description and accompanying drawings of the present invention. The attached drawings are for reference and description only, and are not intended to limit the protection scope of the present invention.

[0023] like figure 1 As shown, this embodiment discloses an energy transfer-based battery balancing control method, including:

[0024] S1. Obtain the voltage value U of the two battery cells 1 , U 2 And calculate the difference between the two voltage values ​​△U=U 1 -U 2 ;

[0025] S2. Determine whether the voltage difference △U is greater than the upper limit ε max , if so, go to step S3, otherwise go to step S4;

[0026] S3. Determine whether △U is greater than 0, if so, then d 2 =d max , d 1 =0, if otherwise d 1 =d max , d 2 =0, where d 1 , d 2 respectively S 1 , S 2 The drive signal, d max is the upper limit of the driving signal;

[0027] S4. De...

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Abstract

The invention discloses an energy transfer-based battery equalization control method, and belongs to the technical field of a battery. The energy transfer-based battery equalization control method comprises the steps of S1, acquiring voltage values U1 and U2 of two single batteries d, and calculating a difference value Delta U between the two voltage values, wherein Delta U=U1-U2; S2, judging whether the voltage difference Delta U is larger than an upper limit value Epsilon<max> or not, if yes, executing the step S3, otherwise executing the step S4; S3, judging whether Delta U is larger than 0or not, if yes, d2=d<max> and d1=0, otherwise d1=d<max> and d2=0, wherein d1 and d2 are respectively driving signals of S1 and S2, d<max> is a driving signal upper limit; S4, judging whether the voltage difference Delta U is larger than a lower limit value Epsilon<max>, if yes, executing the step S5, otherwise executing the step S6; S5, executing a closed-loop control strategy; and S6, closing the S1 and the S2. By the energy transfer-based battery equalization control method, the closed-loop control strategy is employed when the voltage difference Delta U is larger than the lower limit, theS1 and the S2 are closed, and the energy transfer-based battery equalization control method is applicable to inductance energy transfer-based equalization topology and is high in transportability.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery balancing control method based on energy transfer. Background technique [0002] In the operation of electric vehicles, it is necessary to connect the battery cells in series and parallel to form a battery pack to meet the power requirements during the operation of the vehicle. The charge and discharge current of the battery pack during the operation of the vehicle, the SOC state used, the ambient temperature, the position of the battery cell inside the battery pack, and the self-discharge of the battery will affect the difference in battery attenuation, so that the battery cell is in the battery pack. The SOC state of the battery pack is inconsistent, resulting in an increase in the voltage difference of the battery pack. [0003] The overall balance control method of the battery pack includes electronic switch control, an inductance-based battery balance scheme, et...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 郑昕昕王志海刘新天何耀林彭桃君
Owner HEFEI HENGNENG NEW ENERGY TECH
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