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Method and device for estimating remaining power of low-temperature battery for rechargeable battery

A technology for rechargeable batteries and remaining power, applied in measuring devices, measuring electrical variables, measuring electricity, etc., can solve problems that affect user experience and increase battery remaining power, and achieve the effect of avoiding SOC increase and accurate estimation

Active Publication Date: 2021-12-07
湖南航天捷诚电子装备有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, the application range of rechargeable lithium batteries has expanded rapidly, but the manufacturing process of lithium batteries determines that the dischargeable power of the batteries is directly related to the temperature. There will be a self-temperature rise. The actual situation is that the battery is in the discharge state at the initial stage of low-temperature discharge, but the remaining battery capacity (SOC) increases. This phenomenon will affect the user experience.

Method used

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  • Method and device for estimating remaining power of low-temperature battery for rechargeable battery
  • Method and device for estimating remaining power of low-temperature battery for rechargeable battery
  • Method and device for estimating remaining power of low-temperature battery for rechargeable battery

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Embodiment 1

[0069] This embodiment provides a method for estimating the remaining power of a low-temperature battery for a rechargeable battery, including the following steps:

[0070] S1: Use the temperature monitoring unit 2 to collect the temperature T of each discrete time k and pass it to the power estimation unit 1, and use the voltage and current monitoring unit 6 to collect the output voltage y of the battery at each time step k , input current i k , The internal resistance R of the battery in the charging state of the rechargeable battery + , The internal resistance R of the battery in the discharge state of the rechargeable battery - and the resistance M brought by the hysteresis phenomenon and passed to the power estimation unit 1;

[0071] S2: The power estimation unit 1 is constructed with a low-pass filter R s The open circuit voltage battery model of the state space equation of the state space equation, the state x of the rechargeable battery at discrete time k is estima...

Embodiment 2

[0124] Such as figure 2 As shown, it is an estimation device using the low-temperature battery remaining power estimation method for rechargeable batteries according to Embodiment 1, including a power estimation unit 1, a temperature monitoring unit 2, a heating control unit 3, a heating unit 4, a battery 5, A voltage and current monitoring unit 6, the power estimation unit is constructed with a low-pass filter R s The open circuit voltage battery model of the state space equation, based on the open circuit voltage battery model, the power estimation unit sends an instruction to the heating control unit, so that the heating control unit controls the heating unit to heat the ambient temperature to a different temperature T When the temperature T starts from 25°C, the temperature monitoring unit 2 and the voltage and current monitoring unit 6 collect and monitor various parameters at the temperature T again and transmit them to the power estimation unit. The temperature monito...

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Abstract

The invention provides a method and device for estimating the remaining power of a low-temperature battery for a rechargeable battery. The device includes a power estimation unit, a temperature monitoring unit, a heating control unit, a heating unit, a battery, and a voltage and current monitoring unit. The power estimation The unit establishes an algorithm model, and combines the temperature monitoring unit to fit the data to improve the accuracy of battery power estimation at low temperatures. In the estimation, the impedance current integration method using the resistance component of the battery pack is widely used. Through the modeling of the battery, first of all, the state parameters of the battery are selected. On this basis, the SOC state variable OCV(Z k ), the state equation of the battery is established, and its remaining power can be measured. Then the extended Kalman filter algorithm is used to estimate the state x of the battery by using the measured voltage y value, that is, the SOC of the battery is estimated by the extended Kalman filter algorithm, and the error in the state estimation observation value is minimized.

Description

technical field [0001] The invention belongs to the technical field of estimation of remaining power of low-temperature rechargeable batteries, and in particular relates to a method and device for estimating the remaining power of low-temperature batteries for rechargeable batteries. Background technique [0002] In recent years, the application range of rechargeable lithium batteries has expanded rapidly, but the manufacturing process of lithium batteries determines that the dischargeable power of the batteries is directly related to the temperature. There will be a self-temperature rise. The actual situation is that the battery is in the discharge state at the initial stage of low-temperature discharge, but the remaining battery capacity (SOC) of the battery increases. This phenomenon affects the user experience. Contents of the invention [0003] In view of the above defects, the present invention provides a machine algorithm to establish a data model, fully consider th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/367G01R31/389G01R31/382
CPCG01R31/367G01R31/382G01R31/389
Inventor 夏显忠刘理鹏王浩刘鹏袁志斌
Owner 湖南航天捷诚电子装备有限责任公司