Long-life rapid charging method for lithium ion battery

A lithium-ion battery and fast charging technology, which is applied in the field of new energy research, can solve the problems of low charging efficiency and large battery damage, and achieve the effects of high charging efficiency, prolonging cycle life and fast charging

Active Publication Date: 2016-09-07
珠海中力新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention aims to solve the problems of low charging efficiency of traditio

Method used

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  • Long-life rapid charging method for lithium ion battery
  • Long-life rapid charging method for lithium ion battery
  • Long-life rapid charging method for lithium ion battery

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Experimental program
Comparison scheme
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specific Embodiment approach 1

[0023] Specific implementation mode one: refer to Figure 1 to Figure 5 Describe this embodiment in detail, a kind of lithium-ion battery long-life fast charging method described in this embodiment, it comprises the following contents:

[0024] Step 1, establishing an improved single-particle model for lithium-ion batteries;

[0025] Step 2, using the method of excitation response analysis to obtain the mechanism parameters of the battery in the improved single particle model in step 1;

[0026] Step 3. According to the mechanism parameters of the battery, the lithium intercalation rate on the surface of the negative electrode active material of the battery is obtained;

[0027] Step 4: Comparing the lithium intercalation rate on the surface of the negative active material of the battery with the set threshold, charging with a high current of 2C at the beginning of charging, and stopping charging when the lithium intercalation rate on the surface of the negative active partic...

Embodiment

[0035] The experimental battery uses Sanyo's UR14500P lithium cobalt oxide battery with a nominal capacity of 840mAh and a platform voltage of 3.7V. Select three batteries with similar performance, set up three groups of comparison experiments, and use different charging methods to charge respectively. The first group adopts the fast charging method in the present invention, that is, the combination mode of 2C high-rate charging and pulse charging, and the second group uses Large current 2C constant current and constant voltage charging, the third group performs traditional 1C constant current and constant voltage charging.

[0036] attached Figure 7-10 The comparison curves of the charging current, battery terminal voltage, lithium ion concentration on the negative electrode surface, and battery SOC of the three charging methods are given respectively. Figure 7is the charging current curve. Different from the constant current and constant voltage charging mode, the chargin...

specific Embodiment approach 2

[0038] Specific embodiment 2: This embodiment is a further description of a long-life fast charging method for lithium-ion batteries described in specific embodiment 1. In this embodiment, in step 1, an improved single-event model is established for lithium-ion batteries for:

[0039] According to the formula:

[0040] the y avg =y 0 +It / Q p (Equation 1) and x avg =(1-y ofs -y avg ) Q p / Q n (Formula 2),

[0041] Obtain the average lithium ion concentration y inside the positive electrode active particles avg and the average lithium ion concentration inside the negative electrode active particle x avg ,

[0042] In the formula, Q p and Q n They are the capacity of the positive electrode and the negative electrode respectively, I is the load current, it is stipulated that the discharge is positive, t is the time, and y 0 is the initial lithium intercalation concentration fraction of the positive electrode of the battery, y ofs It is the ratio offset of positive a...

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Abstract

The invention discloses a long-life rapid charging method for a lithium ion battery, and relates to the field of research of new energies. The invention is to solve the problem that the traditional lithium ion battery is low in charging efficiency and large in damage to the battery during a charging process. According to the method, an improved single-particle model is established for the lithium ion battery; the mechanism parameters of the battery in the improved single-particle model is obtained by using an excitation response analysis method; according to the mechanism parameters of the battery, the embedded lithium rate on the active substance surfaces of the anode of the battery is obtained; the size relationship between the embedded lithium rate on the active substance surfaces of the anode and a set threshold is obtained by comparison, and the charging current size and charging time of the battery are controlled according to the size relationship, and thereby the rapid charging of the lithium ion battery is achieved. The method is applied to the long-life rapid charging of the lithium ion battery.

Description

technical field [0001] The invention relates to a long-life fast charging method for a lithium ion battery. It belongs to the field of new energy research. Background technique [0002] The outstanding features of lithium-ion batteries are high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and environmental protection. It is the main energy storage device for large equipment or systems. As a high-quality carrier of electric energy, it has a wide range Application prospect. In order to improve the efficiency of lithium-ion batteries, fast charging technology has always been a research hotspot by scholars at home and abroad, and many fast charging methods have been developed. Constant current and constant voltage charging is the most commonly used charging scheme. Its control is simple and reliable, it is convenient for the design and implementation of the charger, and it has strong adaptability to different batteries. Large c...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCH01M10/44Y02E60/10
Inventor 吕超刘璇赖庆志李俊夫王立欣
Owner 珠海中力新能源科技有限公司
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