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Power battery balancing system for electric vehicle, and control method

A power battery and equalization control technology, which is applied in electric vehicles, battery/fuel cell control devices, charge equalization circuits, etc., can solve the problems of frequent opening and closing, unsatisfactory equalization effect, etc., and achieve the effect of preventing frequent opening and closing

Active Publication Date: 2019-07-09
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a power battery equalization system for electric vehicles, which can effectively prevent frequent opening and closing of equalization caused by misjudgment, and solve the problem of unsatisfactory equalization effect

Method used

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  • Power battery balancing system for electric vehicle, and control method
  • Power battery balancing system for electric vehicle, and control method
  • Power battery balancing system for electric vehicle, and control method

Examples

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Embodiment 1

[0054] This embodiment provides a power battery equalization system for electric vehicles, which can effectively prevent the equalization from being turned on and off frequently due to misjudgment, and solve the problem of unsatisfactory equalization effect.

[0055] Such as figure 1 Shown is a schematic diagram of the power battery balancing system for electric vehicles of the present invention. Specifically, a power battery balancing system for electric vehicles includes a passive balancing circuit and a balancing control module;

[0056] The passive equalization circuit includes several electric cores connected in series; resistors, MOS switches and relays are connected in parallel at both ends of the electric cores, and a common relay is connected in parallel between two adjacent electric cores.

[0057] In an embodiment of the present invention, the battery cells connected in series form a power battery pack; the resistor is used to discharge the power of the battery cel...

Embodiment 2

[0091] This embodiment provides a power battery balance control method for electric vehicles, including the following steps:

[0092] S10, the power battery starts charging and discharging;

[0093] S20. The balance control unit judges the signal input by the input unit; if there is no fault in the circuit, the temperature of the circuit board and the power battery module are within a safe range, the voltage difference between the cells is greater than a certain threshold and the cell voltage is reasonable within the threshold, execute step S30; otherwise, do not enable equalization;

[0094] S30. Detect the state of charge of the power battery; if the state of charge of the power battery is less than 20%, execute step S40; if the state of charge of the power battery is greater than or equal to 20% and less than or equal to 100%, execute step S50;

[0095] S40. Detect the voltage of each cell of the power battery; if there is a voltage difference between any two cells greater...

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Abstract

The invention discloses a power battery balancing system for an electric vehicle. The power battery balancing system comprises a passive balancing circuit and a balancing control module; the passive balancing circuit comprises a plurality of cells connected in series; the two ends of the cells are connected with a resistor, an MOS switch and a relay in parallel; the balancing control module comprises an input unit, a balancing control unit and an output unit; the input unit is used for transmitting signals to the balancing control unit; the balancing control unit is used for receiving the signals transmitted by the input unit; and the output unit is used for sending a balancing control instruction to the passive balancing circuit. According to the system, the cell voltage or the state of charge of the cells is selected as the balancing variable for balancing control, so that frequent opening and closing caused by error judgment of balancing can be effectively prevented; and the problemthat the balancing effect is not ideal due to the fact that the state of charge the cells is not accurately estimated in the charging and discharging process of the cells of the power battery is solved; and meanwhile, the maximum utilization rate of the electric quantity of the balanced ideal target battery is favorably realized by taking the electric quantity as the balance target.

Description

technical field [0001] The invention relates to the field of new energy vehicle power battery management systems, in particular to a power battery equalization system and control method for electric vehicles. Background technique [0002] Most of the power batteries for new energy vehicles are composed of multiple batteries connected in series and parallel to meet the energy requirements of the whole vehicle. Although each battery cell of the power battery has been strictly screened before leaving the factory, it is difficult to ensure the consistency of the battery cells due to the inconsistency of production and process. The inconsistency will get worse. When charging, some cells first reach the cut-off voltage of charging and complete charging. When discharging, some cells first reach the cut-off voltage of discharge and stop discharging, which greatly reduces the available energy of the power battery and affects the driving range of new energy vehicles. [0003] The cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42B60L58/22
CPCH02J7/0016H01M10/4207H01M10/4257H01M2010/4271Y02T10/70Y02E60/10
Inventor 姜辉刘鹏飞王君君田崇文
Owner CHINA FIRST AUTOMOBILE