A method and system for performing SOC correction according to the change process of battery state quantity

A battery state, SOC0 technology, applied in the direction of measuring electrical variables, battery/fuel cell control devices, measuring electricity, etc., can solve problems that cannot be eliminated, large errors, and cannot meet the accuracy of SOC estimation, etc., to achieve convenient development and use, improve SOC The effect of precision

CN105652210BActive Publication Date: 2019-07-26HUIZHOU BNET TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-07-26

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Abstract

The invention discloses an SOC correction method and a system during the changing process of the battery state quantity. The method comprises the steps of recording battery state parameters at a preset frequency during the operation of a battery; calculating the variation value of each battery state parameter within a time period corresponding to the preset frequency within a preset time span; calculating the difference between two adjacent variation values; determining a reference SOC value according to the difference between adjacent variation values of the battery state parameters; detecting a current actual SOC value and comparing the current actual SOC value with the reference SOC value; on the condition that the deviation exists between the current actual SOC value and the reference SOC value, correcting the current actual SOC value to be the reference SOC value. The system comprises a battery state parameter memory module, a battery state parameter variation value calculating module, a battery state parameter variation value difference calculating module, a reference SOC value determination module and a correction module. According to the technical scheme of the invention, the SOC accuracy of a battery pack of different aging degrees and in different environments can be improved. Meanwhile, the occurrence of errors caused by the poor consistency and property changes, such as the series-parallel connection of batteries, the aging of batteries, the environmental change and the like, can be eliminated.
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Description

technical field

[0001] The present invention relates to the technical field of electric vehicles, and more specifically, relates to a method and system for SOC correction according to the change process of battery state quantity. Background technique

[0002] For electric vehicles, the power battery is a very common energy storage component, and its performance plays a decisive role in the performance of the vehicle. In the power battery, lithium-ion batteries are used as an important energy storage medium, and have been widely used in the field of new energy. Wide range of applications. The remaining power of the battery, also known as the State of Charge (SOC) of the battery, is one of the important parameters of the battery state, and provides a basis for the control strategy of the electric vehicle. Accurately estimate the remaining power of the current battery, ensure that the SOC is maintained within a reasonable range, prevent overcharge or overdischarge from damage ...

Examples

Embodiment 1

[0038] Embodiment 1 of the present invention provides a method for SOC correction according to the change process of the battery state quantity, figure 1 It is a flow chart of the method of Embodiment 1 of the present invention, please refer to figure 1 , the method of the embodiment of the present invention includes the following steps:

[0039] Step S101 memorizes battery state parameters at a preset frequency during battery operation, such as 10MS to memorize the primary ampere-hour, total voltage, cell voltage, current and temperature, ΔAH10MS, ΔSUMV10MS, ΔVOLT10MS, ΔCUR10MS, ΔT10MS;

[0040] Step S102, calculating the change amount of each battery state parameter within the preset time length and the time period corresponding to the preset frequency, such as the change amount of memory ampere-hour data △AH10MS0, △AH10MS1, △AH10MS2...△AH10MS(N);

[0041] Step S103, calculate the difference between two adjacent variations, for example, the difference in ampere-hour variati...

Embodiment 2

[0047] The second embodiment of the present invention provides a method for correcting SOC according to the change process of the battery state quantity, which is an improvement on the basis of the first embodiment. figure 2 It is the method flowchart of the second embodiment of the present invention, please refer to figure 2 , the method of the embodiment of the present invention includes the following steps:

[0048] Step S201, memorizing battery state parameters at a preset frequency during battery operation, the battery state parameters include ampere hours, total voltage, single cell voltage, current and temperature;

[0049] The preset frequency adopts the frequency with the fastest sampling frequency among all battery state parameters;

[0050] Step S202, calculating the change amount of each battery state parameter in the time period corresponding to the preset frequency within the preset time length;

[0051] The preset time length is not less than the sampling peri...

Embodiment 3

[0061] Embodiment 3 of the present invention provides a system for SOC correction according to the change process of the battery state quantity, image 3 It is a structural block diagram of Embodiment 2 of the present invention, please refer to image 3 The system for performing SOC correction according to the change process of the battery state quantity in the embodiment of the present invention includes a battery state parameter memory module 1, a battery state parameter change calculation module 2, a battery state parameter change difference calculation module 3, and a reference SOC value determination module 4 and the correction module 5, the principle of each functional module will be described in detail below.

[0062] The battery state parameter memory module 1 is used to memorize battery state parameters at a preset frequency during battery operation;

[0063] The battery state parameter variation calculation module 2 is used to calculate the variation of each battery...