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Estimation method for lithium ion battery internal temperature

A lithium-ion battery, internal temperature technology, applied in the direction of secondary battery repair/maintenance, to achieve the effect of improving reliability and safety, and reliable battery temperature value

Active Publication Date: 2015-06-24
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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  • Estimation method for lithium ion battery internal temperature

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Experimental program
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Effect test

Embodiment approach

[0035] The energy W lost by the battery module 1 It can be derived in a number of ways. But the embodiment that the present invention preferably adopts is as follows:

[0036] Calculate the energy lost by the battery module, i.e. the energy used to increase the temperature of the battery module. In addition to the energy provided to the electric vehicle, part of the energy of the vehicle battery is converted into the heat of the battery, that is, the electric energy is converted into heat energy, which increases the temperature of the battery. 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 - state of charge of the battery) lookup table to obtain the corresponding SOC value Open circuit voltage, denoted as U OCV . Denote the terminal voltage of the battery module as U, and use the open circuit voltage U of the battery module OCV Subtra...

Embodiment 1

[0053] This embodiment one 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 the 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 respectively measured at the air inlet, the air outlet of the battery module, and the surface of the battery module in one-to-one correspondence to obtain the three battery temperature sensors. The temperature measurement value of each position, and then take the average value of the temperature measurement value 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 c...

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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 for electric vehicles, 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, 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 parameters such as battery capacity and Coulombic efficiency at the corresponding temperature according to the battery temperature; in the battery fault diagnosis, it is necessary to judge whether the battery is 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 by measuring the temperature sensor, which mainly include...

Claims

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Application Information

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Patent Type & Authority Applications(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