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Lithium ion battery peak power prediction method considering heat effect influence

A lithium-ion battery, peak power technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as inaccurate peak power

Active Publication Date: 2021-03-19
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to solve the inaccurate problem of the peak power obtained by the existing electrochemical model

Method used

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  • Lithium ion battery peak power prediction method considering heat effect influence
  • Lithium ion battery peak power prediction method considering heat effect influence
  • Lithium ion battery peak power prediction method considering heat effect influence

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specific Embodiment approach 1

[0099] Specific implementation mode one: refer to figure 1 and figure 2 Specifically illustrate this embodiment, the method for predicting the peak power of a lithium-ion battery considering the influence of thermal effects described in this embodiment, the method includes the following steps:

[0100] Step 1. Establish a simplified electrochemical model of the lithium-ion battery according to the detected current, terminal voltage and internal temperature of the battery during charging and discharging of the lithium-ion battery;

[0101] Step 2, performing parameter identification on the simplified electrochemical model of the lithium-ion battery to obtain identification parameters;

[0102] Step 3. Obtain the internal variables of the lithium-ion battery according to the identification parameters;

[0103] Step 4. According to the set discharge time length and the internal variables of the lithium-ion battery, the terminal voltage of the lithium-ion battery cell, the inte...

specific Embodiment approach 2

[0105] Specific embodiment 2: This embodiment is a further description of the lithium-ion battery peak power prediction method considering the thermal effect described in specific embodiment 1. In this embodiment, in step 1, the simplified electrochemical model of the lithium-ion battery is :

[0106]

[0107] In the formula, U app is the terminal voltage of the lithium-ion battery, U p and U n are the positive and negative open circuit potentials, respectively, y surf and x surf are the lithium ion concentration on the solid phase surface of the positive and negative electrodes, R is the ideal gas constant, F is the Faraday constant, T is the internal temperature of the lithium ion battery, c 0 is the initial lithium ion concentration in the electrolyte, m p and m n is an intermediate variable, Δc 1 and Δc 2 is the lithium ion concentration at the positive and negative current collectors relative to the initial lithium ion concentration c in the electrolyte 0 The ...

specific Embodiment approach 3

[0108] Embodiment 3: This embodiment is to further explain the method for predicting the peak power of a lithium-ion battery considering the influence of thermal effects described in Embodiment 2. In step 2, the identification parameters specifically include:

[0109] Battery state of charge:

[0110]

[0111] In the formula, soc(t) is the state of charge of the battery at time t, I is the external current, Q all is the discharge capacity of the single battery;

[0112] Battery open circuit voltage:

[0113] E. ocv =U p [y 0 +D y (1-soc)]-U n [x 0 -D x (1-soc)] Formula 3,

[0114] In the formula, E ocv is the open circuit voltage of the battery, U p is the positive open circuit potential curve, U n is the negative open circuit potential curve; D y is the variation range of the amount of lithium intercalated in the positive electrode, D x is the variation range of the amount of lithium intercalated in the negative electrode, y 0 is the initial lithium intercal...

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Abstract

The invention discloses a lithium ion battery peak power prediction method considering heat effect influence, and relates to the technical field of power battery systems. The objective of the invention is to solve the problem of inaccurate peak power obtained by using an electrochemical model in the prior art. The method comprises the steps of establishing a simplified electrochemical model of a lithium ion battery; performing parameter identification on the simplified electrochemical model of the lithium ion battery to obtain identification parameters; obtaining an internal variable of the lithium ion battery; obtaining the terminal voltage of the single lithium ion battery, the internal temperature of the battery at different moments and the maximum discharge rate; and respectively finding three critical discharge rates between the initial discharge rate and the maximum discharge rate, selecting a minimum value from the three found critical discharge rates, and obtaining the peak power of the lithium ion battery in combination with the terminal voltage average value of the single lithium ion battery at different moments. The method is used for obtaining battery peak power so as to protect the service life of the battery.

Description

technical field [0001] The invention relates to a method for predicting the peak power of a lithium-ion battery based on a simplified electrochemical model considering the influence of thermal effects. It belongs to the technical field of power battery systems. Background technique [0002] The peak power of electric vehicles directly affects the acceleration climbing performance and regenerative braking energy recovery capability. If the peak power is too low, the energy provided by the battery will not be able to meet the needs, and the peak power of the battery is of great significance to improve the reliability, safety and service life of the battery. In view of the non-direct measurement of peak power, it is particularly necessary to accurately predict it. [0003] At present, in the process of predicting the peak power of power batteries, most of them use the battery state of charge (SOC) and terminal discharge voltage as constraints, and use the equivalent circuit m...

Claims

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Application Information

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IPC IPC(8): G01R31/367G01R31/378
CPCG01R31/367G01R31/378
Inventor 王立欣李俊夫杨龙刘能锋于瀚卿于全庆王宇海楚潇
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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