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Lithium battery optimal charging current acquisition method

A technology of charging current and maximum charging current, applied in the direction of charging/discharging secondary batteries, secondary batteries, electrochemical generators, etc., can solve the problems of increased charging current, increased battery loss, and reduced charging time.

Active Publication Date: 2019-02-15
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to solve the problem that the charging current of the existing lithium battery increases, the charging time decreases, and the loss of the battery itself increases. Now, a method for obtaining the optimal charging current of the lithium battery based on the charging time and the energy loss of the battery itself is provided.

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  • Lithium battery optimal charging current acquisition method
  • Lithium battery optimal charging current acquisition method
  • Lithium battery optimal charging current acquisition method

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specific Embodiment approach 1

[0021] Specific implementation mode one: refer to figure 1 , figure 2 with Figure 5 Specifically explaining this embodiment, the method for obtaining the optimal charging current of a lithium battery based on the charging time and energy loss of the battery itself described in this embodiment includes the following steps:

[0022] Charging process division steps: Divide the charging process into N charging stages, in which the SOC increases from 0 to 1, every increase of p% SOC is a charging stage;

[0023] Model establishment steps: establish a first-order RC equivalent circuit model of a lithium battery, which includes the following parameters: controlled voltage source, battery internal resistance, polarization resistance, and polarization capacitance;

[0024] Boundary condition determination step: use charging experiments to determine the parameters of the first-order RC equivalent circuit model in each charging stage and the boundary conditions for charging current s...

specific Embodiment approach 2

[0029] Specific embodiment 2: This embodiment is a further description of the method for obtaining the optimal charging current of a lithium battery based on the charging time and the energy loss of the battery itself described in the specific embodiment 1. In this embodiment, the following method is used to determine each charging current. The parameters of the first-order RC equivalent circuit model in the stage and the boundary conditions for the selection of charging current:

[0030] In each charging stage, the charging rate starts from 0.1C (C represents the rated capacity of the battery), and a charging experiment is carried out every time the charging rate increases by 0.1C, until the charging rate reaches the maximum charging rate allowed by the lithium battery, and a total of X times of charging experiments are carried out. Obtain the parameters of the X group of first-order RC equivalent circuit models and the X maximum charging currents, fit the X maximum charging c...

specific Embodiment approach 3

[0031] Specific implementation mode three: refer to image 3 Describe this embodiment in detail. This embodiment is to further explain the method for obtaining the optimal charging current of a lithium battery based on the charging time and the energy loss of the battery itself described in the second embodiment. In this embodiment, before the charging experiment, first set the The charging experiment process is divided into M experimental stages, in which, during the growth of SOC from 0 to 1, every increase of q% SOC is an experimental stage,

[0032] Described charging experiment comprises the following steps:

[0033] Step 11: Charge the lithium battery for 10 seconds and then rest for 5 minutes to obtain the first-order RC equivalent circuit model parameters of the i-th experimental stage, where the initial value of i is 1, and then perform step 12;

[0034] Step 12: Charge the lithium battery, and judge whether the voltage of the lithium battery is greater than the char...

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Abstract

The invention discloses a charging time and battery self energy loss-based lithium battery optimal charging current acquisition method, relates to the technical field of lithium battery charging, and aims to solve the problems of increased charging current, shortened charging time and increased battery self loss of the existing lithium battery. According to the charging time and battery self energy loss-based lithium battery optimal charging current acquisition method disclosed in the invention, the maximum charging current of the battery at different SOC is taken as the boundary condition; the charging time and the battery self energy loss in the whole charging process are taken as the object to establish a target function; and the target function is optimized by adopting a dynamic planning algorithm, so as to obtain the charging time and battery self loss-based optimal charging current in the whole charging process. The optimal charging current acquisition method is applicable to battery charging.

Description

technical field [0001] The invention belongs to the technical field of lithium battery charging. Background technique [0002] At present, the most commonly used charging method for lithium batteries is the constant current and constant voltage charging method. First, the battery is charged with a constant current. When the battery voltage reaches a certain value, it is charged with a constant voltage until the charging current is less than a certain value. This charging method is simple and easy to control, but the selection of the charging current in the constant current stage is basically obtained by experience, and its impact on the energy loss and charging time of the battery itself is uncertain. [0003] The energy loss of the battery itself is the main reason for the heating of the battery, and the heating of the battery can easily cause the thermal runaway of the battery; and the long charging time is one of the important factors restricting the popularization and us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/0525H01M10/44H01M10/446H01M10/448Y02E60/10
Inventor 吴晓刚石文文
Owner HARBIN UNIV OF SCI & TECH
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