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A method for estimating the internal temperature of a lithium-ion battery

A lithium-ion battery, internal temperature technology, applied in the direction of secondary battery repair/maintenance, etc., to achieve reliable battery temperature values, improve reliability and safety effects

Active Publication Date: 2017-02-08
北汽云南瑞丽汽车有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of lithium-ion battery is not popular yet, and what is widely used is still an ordinary lithium-ion battery without a temperature sensor probe.

Method used

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  • A method for estimating the internal temperature of a lithium-ion battery

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Embodiment approach

[0035] The energy lost by the battery module W 1 It can be obtained in a variety of ways. However, the preferred embodiments of the present invention are as follows:

[0036] Calculate the energy lost by the battery module, that is, the energy used to increase the temperature of the battery module. In addition to the energy provided by the on-board battery for electric vehicles, part of it is converted into battery heat, that is, electrical energy is converted into heat energy, which increases the battery temperature. Obtain the state of charge (SOC) value of the battery of the battery module from the battery management system (Battery Management System, BMS), and use the OCV-SOC (open circuit voltage-battery state of charge) to check the value table to obtain the corresponding SOC value Open circuit voltage, denoted as U OCV . Mark the terminal voltage of the battery module as U, and use the battery module open circuit voltage U OCV Subtract the terminal voltage of the battery...

Embodiment 1

[0053] The first embodiment provides a method for estimating the internal temperature of a lithium ion battery, such as figure 1 As shown, the steps involved are as follows:

[0054] S1 uses a battery temperature sensor to measure the temperature of the battery module as the temperature measurement value of the battery temperature sensor;

[0055] In the step of measuring the temperature measurement value of the temperature sensor, the three battery temperature sensors are measured in a one-to-one correspondence at the air inlet, the air outlet, and the surface of the battery module to obtain the three battery temperature sensors. The temperature measurement values ​​of three positions, and then take the average value of the temperature measurement values ​​of the three positions as the temperature measurement value T of the battery temperature sensor ce . .

[0056] S2 calculates the energy lost by the battery module and the heat of the air flow of the battery module;

[0057] Th...

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Abstract

The invention relates to the field of battery temperature acquisition of electric automobiles, in particular relates to an estimation method for lithium ion battery internal temperature. The method includes: calculating the internal temperature of a battery module according to the following calculation model: Td(k)=Td(K-1)+(W1-W2) / C. Specifically, Td(k) is an internal temperature estimation value DEG C of the battery module at the time of k, W1 is the lost energy J of the battery module, W2 is the air flow change heat J of the battery module, and C is the specific heat capacity J / (kg.DEG C) of the battery module, wherein the initial value of the internal temperature estimation value Td of the battery module adopts the measured temperature value of a temperature sensor. The method provided by the invention estimates the internal temperature of the battery module through modeling of the battery module internal temperature so as to accurately reflect the battery module internal temperature and provide more reliable battery temperature value for BMS state calculation and fault diagnosis, thereby improving the reliability and safety of a battery pack.

Description

Technical field [0001] The invention relates to the field of battery temperature collection of electric vehicles, and in particular to a method for estimating the internal temperature of a lithium ion battery. Background technique [0002] During the use of electric vehicle batteries, an accurate estimation of the battery temperature plays an important role in ensuring the normal operation of the battery. For example, in the calculation of the SOC (state of charge) of the BMS (battery management system), it is necessary to know the battery capacity and coulomb efficiency at the corresponding temperature according to the battery temperature; in the battery fault diagnosis, it is necessary to determine whether the battery is based on the battery temperature Work within the specified temperature range to prevent the battery temperature from being too high or too low. [0003] At present, the battery temperature is generally collected through temperature sensor measurement, which main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42
CPCY02E60/10
Inventor 苏海霞张君鸿周健赵景辉杨伟斌
Owner 北汽云南瑞丽汽车有限公司