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

Pending Publication Date: 2021-05-18
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, complex algorithms are required and the hardware requirements are higher. When the current is too small or the s

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  • SOC estimation method, device and system
  • SOC estimation method, device and system

Examples

Experimental program
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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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Abstract

The invention discloses an SOC estimation method, device and system, and the method comprises the steps: carrying out the SOC estimation based on the pressure data of a battery pack when the current voltage of the battery pack is in a platform voltage interval, comprising the following steps: extracting historical pressure data and historical platform SOC data when the voltage of the battery pack is in a corresponding platform voltage interval in the last charging/discharging process, and constructing a corresponding mapping model; collecting pressure data of the battery pack in the current charging/discharging process to obtain estimated point pressure data; and based on the mapping model, generating an SOC estimation value corresponding to the estimation point pressure data. The SOC state corresponding to the pressure data is estimated through the mapping relation between the pressure data and the SOC state, the precision requirement of the voltage detection device is reduced on the premise that the precision of the estimation result is guaranteed, the estimation method is simplified, and the cost is effectively reduced.

Description

technical field [0001] The present invention relates to the field of battery power management, in particular to an SOC estimation method, device and system. Background technique [0002] SOC (state of charge), state of charge. [0003] During the charging / discharging process of different battery packs, there is a relatively gentle charging and discharging platform, and the voltage difference between the voltage at a higher SOC and the voltage at a lower SOC is not large. The SOC status displayed by BMS circuit components, chargers, external hardware, etc. is usually converted based on voltage values ​​or through current time integral calculations. [0004] When the battery pack is charging and discharging, the voltage difference is small, and the voltage detection device is required to have high precision to accurately distinguish the voltage change, so as to accurately estimate the SOC state of the battery pack. A high-precision voltage detection device is costly. [000...

Claims

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Application Information

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IPC IPC(8): G01R31/367G01R31/388
CPCG01R31/367G01R31/388
Inventor 刘桃松陈建陈冬党志敏张文相佳媛于文志张焱胡雨萌
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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