Voltage determination method and device for SOC initial value calculation

A determination method and technology of initial value, applied in the field of cell voltage determination method and device, can solve the problems of affecting the initial value of SOC, correction of SOC value, inaccurate SOC parameters, etc., so as to improve the accuracy of estimation and avoid errors in the initial value of SOC Effect

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Problems solved by technology

[0004] For the above estimation algorithm, if the voltage sampling is abnormal, the SOC value cannot be corrected, resulting in inaccurate SOC parameters. In the process of BMS power-on initialization, the voltage jump will affect the initial value of SOC, which will lead to SOC Estimates are biased

Method used

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  • Voltage determination method and device for SOC initial value calculation
  • Voltage determination method and device for SOC initial value calculation
  • Voltage determination method and device for SOC initial value calculation

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Embodiment 1

[0049] see figure 1 , which is a flowchart of a voltage determination method for SOC initial value calculation provided by an embodiment of the present invention, the method may include:

[0050]S101: After the BMS is powered on, obtain cell sampling voltage values ​​at multiple consecutive sampling moments.

[0051] Electric vehicles are powered by power battery packs, which are usually composed of multiple cells connected in series. In this embodiment, after the BMS is powered on, a certain battery cell of the battery pack is used as a reference, and multiple sampling moments are selected within a continuous period of time to obtain the sampled voltage values ​​of the battery cell at multiple sampling moments.

[0052] After the BMS is powered on, multiple sampled voltage values ​​of the battery cell can be obtained within a certain continuous period of time t, where the time t can be determined according to the time requirement for the BMS to be powered on and initialized....

Embodiment 2

[0084] see figure 2 , which is a flow chart of another voltage determination method for SOC initial value calculation provided by an embodiment of the present invention, the method may include the following steps:

[0085] S201: After the BMS is powered on, obtain cell sampling voltage values ​​at multiple consecutive sampling moments.

[0086] S202: Obtain a sampled average voltage value of the battery cells by sampling the voltage values ​​of the plurality of battery cells.

[0087] S203: Obtain the voltage value of the battery pack within the sampling time, and obtain the calculated average voltage value of the battery cell through the voltage value of the battery pack.

[0088] S204: Determine whether the difference between the sampled average voltage value and the calculated average voltage value is within a first voltage threshold range.

[0089]When the difference between the sampled average voltage value and the calculated average voltage value is within the first v...

Embodiment 3

[0097] see image 3 , this figure is a schematic structural diagram of a voltage determination device for SOC initial value calculation provided by an embodiment of the present invention, the device includes:

[0098] The cell voltage sampling unit 301 is used to obtain cell sampling voltage values ​​at multiple consecutive sampling moments after the BMS is powered on;

[0099] A sampled average voltage value acquisition unit 302, configured to obtain a sampled average voltage value of the cell through a plurality of sampled voltage values ​​of the cells;

[0100] The calculated average voltage value acquisition unit 303 is configured to obtain the voltage value of the battery pack within the sampling time, and obtain the calculated average voltage value of the battery cell through the voltage value of the battery pack;

[0101] A first judging unit 304, configured to judge whether the difference between the sampled average voltage value and the calculated average voltage val...

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Abstract

The invention provides a voltage determination method and device for SOC initial value calculation. The method comprises steps that after a BMS is powered on, battery core sampling voltage values at multiple continuous sampling moments are obtained; a sampling average voltage value of the battery core is obtained through a plurality of battery core sampling voltage values; a voltage value of the battery pack is obtained within the sampling time, and a calculated average voltage value of the battery core is obtained through the voltage value of the battery pack; whether a difference value between the sampling average voltage value and the calculation average voltage value is within a first voltage threshold range or not is determined; if yes, whether the standing time before the BMS is powered on is within a first time threshold range or not is determined; if not, an SOC initial value is calculated through the sampling average voltage value. The method is advantaged in that the batterypack voltage is utilized to verify the core voltage, and further determination is carried out through the standing duration of the BMS, so the situation that the SOC initial value is wrong when the voltage is abnormal is avoided, and estimation accuracy of the SOC initial value is improved.

Description

technical field [0001] The present invention relates to the field of electric vehicles, in particular to a battery cell voltage determination method and device for calculating an SOC initial value. Background technique [0002] Battery SOC (State of Charge, state of charge) is the core parameter in the battery management system (BMS, Battery Management System). SOC estimation is to obtain the available power of the battery and the evaluation of battery life. The SOC parameter is used to prevent the battery from appearing during charging and discharging. Abnormal phenomena such as overcharge, overdischarge, overvoltage and undervoltage. SOC parameters are the premise of providing pure electric cruising range for electric vehicles, and accurate SOC estimation provides a guarantee for the safe cruising range of vehicles. [0003] Usually, the algorithm for SOC estimation mostly adopts the ampere-hour integration method or the extended Kalman filter recursive algorithm based on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/388G01R31/396
Inventor 陆珂伟王林周翔
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