Method and device for balancing battery capacity of battery system and electric automobile

A battery system and battery capacity technology, applied in battery circuit devices, electric vehicles, circuit devices, etc., can solve the problems of unfavorable popularization and application, unsuitable lithium iron phosphate batteries, etc.

Active Publication Date: 2014-03-26
奇瑞新能源汽车股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the existing vehicle equalizer is used to balance the battery capacity of lithium iron phosphate battery in real time, strict requirements are put forward in terms of equalization strategy and equalization algorithm, and real-time equalization requires that the battery capacity of each equalization is small, which requires The equalization algorithm must be very accurate, which is not conducive to popularization and application, so the existing solutions are not suitable for lithium iron phosphate batteries

Method used

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  • Method and device for balancing battery capacity of battery system and electric automobile
  • Method and device for balancing battery capacity of battery system and electric automobile
  • Method and device for balancing battery capacity of battery system and electric automobile

Examples

Experimental program
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Embodiment 1

[0055] like figure 1 As shown, this embodiment provides a battery capacity equalization method for a battery system. The battery system includes multiple single batteries. Since the structure of the battery system belongs to the prior art, the connection method of the multiple single batteries is also It belongs to the prior art, and can be assembled by those skilled in the art in series, or in combination with series and parallel according to actual needs, and will not be repeated here.

[0056] The method comprises the steps of:

[0057] s101. Charging the battery system until the end of charging, so that the battery system is in a fully charged state, and recording the voltages of all the single cells in the battery system at the end of charging.

[0058] Since the battery system can be used in a car, it can be charged by an external 220V power supply to charge the car to charge the battery system, and the car's battery management system ( BMS) detects and records the ove...

Embodiment 2

[0078] like image 3 As shown, this embodiment provides a battery capacity equalization method for a battery system, including the following steps:

[0079] Steps s201-s204 are the same as steps s101-s104 and will not be repeated here.

[0080] s205. When it is determined that the equalization ends, discharge the battery system until the end of discharge, and record the voltages of all the single cells at the end of discharge.

[0081] Similarly, the battery management system (BMS) of the car can be used to detect and record the overall voltage of the battery system and the voltage of all single cells in the battery system in real time during the discharge process of the battery system (from the start of discharge to the end of discharge).

[0082] s206. Judging whether the battery system satisfies the preset second pressure difference (ie, the pressure difference at the end of discharge) according to the voltages of all single cells in the battery system at the end of discha...

Embodiment 3

[0099] like Figure 7 As shown, this embodiment provides a battery capacity equalization device for a battery system (the equalization device corresponds to the equalization method described in Embodiment 1), the battery system includes a plurality of single batteries, and the equalization device includes: A charging unit, a first recording unit, a first selecting unit, an equalizing unit and a first judging unit;

[0100] The charging unit is used to charge the battery system until charging ends;

[0101] The first recording unit is used to record the voltages of all the single batteries in the battery system at the end of charging, and output them to the first selection unit;

[0102] The first selection unit is used to select each single battery with a high voltage in the battery system at the end of charging according to the voltages of all single batteries recorded by the first recording unit;

[0103] The equalization unit is used to perform discharge equalization on t...

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Abstract

The invention provides a method for balancing the battery capacity of a battery system. The method includes the steps of firstly, charging the battery system till charging is stopped, and recording the voltages of all independent batteries in the battery system when charging is stopped; secondly, selecting out independent batteries with higher voltages in the battery system when charging is stopped, and sequentially or simultaneously conducting discharging balancing on the selected independent batteries; thirdly, recharging the battery system till charging is stopped, and recording the voltages of all the independent batteries in the battery system when recharging is stopped; fourthly, judging whether the battery system meets the balancing stopping condition or not according to the voltages, recorded when recharging is stopped, of all the independent batteries in the battery system, if yes, judging that balancing is stopped, and if not, executing the second step. Accordingly, the invention provides a device for balancing the battery capacity of the battery system and an electric automobile. The method and device for balancing the battery capacity of the battery system can easily and effectively conduct battery capacity balancing on the lithium iron phosphate batteries.

Description

technical field [0001] The invention relates to the technical field of pure electric vehicle battery systems, in particular to a battery capacity equalization method and device for a battery system and a pure electric vehicle. Background technique [0002] Existing pure electric vehicles generally use lithium-ion batteries as the driving force. There are many kinds of positive electrode materials for lithium-ion batteries, mainly including lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, ternary polymer, lithium iron phosphate, etc., among which Lithium iron phosphate batteries are widely used in pure electric vehicles because of their high safety performance, long life, good high temperature performance, large capacity, no memory effect, light weight, and environmental protection. [0003] Since the rated voltage of the lithium-ion single battery is only 3.2V, and the rated voltage of the power battery that can meet the use of pure electric vehicles is g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 任海娟
Owner 奇瑞新能源汽车股份有限公司
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