SOC estimation method, device and system
A technology for estimating device and pressure data, applied in the direction of measuring device, instrument, measuring electricity, etc., can solve the problems of inaccurate SOC state, inability to detect shunt voltage, and high hardware requirements
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Embodiment 1-1
[0052] Embodiment 1-1, an SOC estimation method, when the current voltage of the battery pack is in the plateau voltage range, the SOC estimation is performed based on the pressure data of the battery pack, such as figure 1 shown, including the following steps:
[0053] S100, extracting historical pressure data and historical platform SOC data when the voltage of the battery pack is in the corresponding platform voltage range during the last charging / discharging process, and constructing a corresponding mapping model;
[0054] The battery pack includes one or more batteries.
[0055] When the current is a discharge process, the historical pressure data and historical platform SOC data of the last discharge process are extracted to construct a corresponding mapping model, and vice versa.
[0056] When the voltage of the battery pack is in the corresponding platform voltage range, the historical pressure data of the battery pack and the historical platform SOC state have a line...
Embodiment 2-1
[0111] Embodiment 2-1, an SOC estimation device, such as Figure 7 As shown, it includes a mode switching module 110, a voltage estimation module 120 and a pressure estimation module 130;
[0112] The voltage estimation module 120 is configured to perform SOC estimation based on the voltage data of the battery pack when the current voltage of the battery pack is outside the plateau voltage range.
[0113] The pressure estimation module 130 is configured to perform SOC estimation based on the pressure data of the battery pack when the current voltage of the battery pack is in the plateau voltage range, and the pressure estimation module includes a construction unit 131 , a detection unit 132 and an estimation unit 133 ;
[0114] The construction unit 131 is used to extract the historical pressure data and historical platform SOC data when the voltage of the battery pack is in the corresponding platform voltage range during the last charging / discharging process, and construct a...
Embodiment 3
[0130] The temperature correction unit is configured to correct the first knee voltage and the second knee voltage based on temperature correction data. Embodiment 3, an SOC estimation system, including a pressure detection device, a voltage monitoring device and an SOC estimation device, wherein the SOC estimation device is connected to the pressure detection device and the voltage detection device respectively;
[0131] A current detection device and a temperature detection device can also be added to the SOC estimation system according to actual needs.
[0132] The pressure detection device is used to detect the pressure change caused by the volume change of the battery pack and generate corresponding pressure data. In this embodiment, it includes one or more pressure sensors, and the pressure sensor can be a thin film sensor, for example;
[0133] Those skilled in the art can arrange the above-mentioned pressure sensor between the batteries or on the side of the batteries ...
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