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Low-temperature battery remaining capacity estimation method and device for rechargeable battery

A technology for recharging batteries and remaining power, applied in measuring devices, measuring electrical variables, measuring electricity, etc., can solve problems such as increasing battery remaining power and affecting user experience

Active Publication Date: 2021-05-18
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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  • Low-temperature battery remaining capacity estimation method and device for rechargeable battery
  • Low-temperature battery remaining capacity estimation method and device for rechargeable battery
  • Low-temperature battery remaining capacity estimation method and device 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 low-temperature battery residual electric quantity estimation method and device for a rechargeable battery. The device comprises an electric quantity estimation unit, a temperature monitoring unit, a heating control unit, a heating unit, a battery and a voltage and current monitoring unit; the electric quantity estimation unit builds an algorithm model; the temperature monitoring unit is adopted to fit data; and the battery electric quantity estimation accuracy at low temperature is improved. In the estimation, an impedance current integration method utilizing a battery pack resistance component is widely adopted, and through the modeling of the battery, firstly, state parameters of the battery are selected; on the basis, the state variable OCV (Zk) of the SOC is obtained through input current and output voltage, a state equation of the battery is established, so that the remaining capacity of the battery can be measured; and the state x of the battery is estimated by using an extended Kalman filtering algorithm and a measured voltage y value, namely the SOC of the battery is estimated through the extended Kalman filtering algorithm, and the error in a state estimation observation value is made to be minimum.

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 Applications(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