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A kind of dynamic equalization circuit of battery management system and dynamic equalization method thereof

A battery management system and dynamic equalization technology, applied in the direction of charge equalization circuit, battery circuit device, arrangement of multiple synchronous batteries, etc., can solve the problem of inaccurate single voltage, reduce the cost of the system wiring harness, and meet the real-time sampling requirements , The effect of reducing system cost

Active Publication Date: 2019-06-28
SHENZHEN KELIE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Individual sampling and balanced collinear schemes such as Figure 3a and 3b As shown, using this wiring method, when equalizing, because there is a voltage drop on the wiring harness, the voltage sampling of the monomer is not accurate at this time

Method used

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  • A kind of dynamic equalization circuit of battery management system and dynamic equalization method thereof
  • A kind of dynamic equalization circuit of battery management system and dynamic equalization method thereof
  • A kind of dynamic equalization circuit of battery management system and dynamic equalization method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0071] like Figure 4a and Figure 4b As shown, the specific wiring method is as follows: the first single battery is connected to 2 wires, the sampling and equalization are split, and the sampling and equalization of the remaining single cells are in the same line. Equivalent circuit such as Figure 4cshown. Real-time cell voltage sampling and real-time equalization control can be realized. For battery collection and equalization of batch cells, the cost of system wiring harness is greatly reduced.

[0072] use as Figure 4a and Figure 4b Shown dynamic equalization circuit, its dynamic equalization method comprises the following steps:

[0073] step 1:

[0074] When the equalizing current is not started, the embedded control software detects the voltage of each single battery in each group of battery packs connected in series;

[0075] When the monomer equalization is started, the voltage value of the monomer needs to be recalculated and converted to eliminate the vol...

Embodiment 2

[0107] like Figures 5a to 5c As shown, the sampling and equalization wiring of the last single battery can also be a branch line, and the sampling and equalization wiring of the other single batteries are in the same line. At this time, the sampling strategy is to start sampling from the last section, that is, first calculate the impedance R3 of the last sampling line of the last single battery, and then perform calculations in descending order.

[0108] The fourth single battery sampling: S4 and S5 are closed, when the equalizing current is not started, the collected voltage is U14, and when the balanced current I=2000mA is started, the collected voltage is U24;

[0109] R 3 =(U 14 -U 24 ) / I,

[0110] And so on:

[0111] R 2 =(U 13 -U 23 ) / I-R 3

[0112] R 1 =(U 12 -U 22 ) / I-R 2

[0113] R 0 =(U 11 -U 21 ) / I-R 1 .

[0114] After the impedance of each sampling line is calculated, when equalization is started, the calculation of the sampling voltage of each...

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Abstract

A dynamic equalization circuit of a battery management system, and a dynamic equalization method therefor. In the circuit, the first cell or the last cell in a group of cells connected in series is connected to a corresponding cell selection switch and a corresponding voltage sample switch by means of a sample wire and an equalization wire separated from each other, respectively; each of the remaining cells is connected to a corresponding cell selection switch and a corresponding voltage sample switch by means of a same wire; during normal operation, and on the basis of impedance values of the sample wires calculated according to a equalization test current condition, a CPU measures sample voltages of the cells and calculates the actual cell voltages by eliminating voltage drops on the wires from the sample voltages, and then performs dynamic equalization control according to the actual cell voltages. The present invention greatly reduces required wire harness cost, and can meet real-time cell voltage sample requirements while equalizing cells, prevent the sample precision from being affected by voltage drops on equalization wires, and make the cell voltage sample correct.

Description

technical field [0001] The invention relates to a dynamic equalization circuit of a battery management system and a dynamic equalization method thereof. Background technique [0002] When new batteries such as lithium-ion batteries are used in series, in order to ensure the safe use of batteries, it is generally necessary to configure a battery management system (BMS). The function of the BMS is mainly used to detect the voltage of the battery cells in real time. If the voltage of each cell in the series battery pack is inconsistent, it needs to be balanced. The balance function refers to the voltage, capacity and charge of each cell in the battery pack. A function in which the discharge characteristics tend to be consistent. There are two commonly used methods: energy dissipation type one-way equalization and energy transfer type two-way equalization. [0003] Energy dissipation type one-way equalization: refers to connecting a switchable discharge resistor in parallel wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H01M10/44H01M10/48
CPCH01M10/441H01M10/482H02J7/0019H01M10/42H02J7/00Y02E60/10
Inventor 张志国胡运平张泱渊仝瑞军
Owner SHENZHEN KELIE TECH
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