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Lithium ion battery and charging and discharging method thereof

A lithium-ion battery, charging and discharging technology, applied in the field of lithium-ion batteries, can solve the problem of lithium deposition at the edge of the negative pole piece, and achieve the effects of improving production efficiency, reducing polarization, and shortening time

Active Publication Date: 2021-12-10
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a charging and discharging method for a lithium-ion battery to solve the problem of lithium decomposing at the edge of the negative pole piece in the prior art after the number of cycles of the lithium-ion battery increases.

Method used

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  • Lithium ion battery and charging and discharging method thereof
  • Lithium ion battery and charging and discharging method thereof

Examples

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Effect test

Embodiment 1

[0040] The lithium-ion battery includes a positive electrode, a negative electrode and an electrolyte. The negative electrode includes a negative electrode current collector and a negative electrode material arranged on the negative electrode current collector. The battery is charged and discharged. The charging and discharging process is shown in Table 1.

[0041] Table 1

[0042]

[0043]

[0044] Among them, the temperature of the charging and discharging process environment is 30 ° C, the conductive agent in the negative electrode material is conductive carbon black (SP), and its mass content is 1.5%; the binder in the negative electrode material is styrene-butadiene rubber (SBR), and its mass content The content is 1.3%, the peel force of the negative electrode is 45N / nm, the current collector is copper foil, the main material of the negative electrode is graphite, and its mass content is 97.2%.

[0045] The test method of peeling force is: first use a cutter with a...

Embodiment 2

[0049] This embodiment 2 is basically the same as the embodiment 1, except that the charge and discharge process is shown in Table 2.

[0050] Table 2

[0051]

[0052]

Embodiment 3

[0054] This embodiment 3 is basically the same as the embodiment 1, except that the charging and discharging process is shown in Table 3.

[0055] table 3

[0056] Step type Current (C) time (min) Voltage (V) cut-off current (C) on hold —— 1 —— —— Constant current and constant voltage charging 0.5 150 4.35 0.05 on hold —— 10 —— —— Constant current discharge 1 90 2.8 —— on hold —— 10 —— —— Constant current charging 0.5 120 3 —— on hold —— 1 —— —— Constant current charging 0.3 120 3.5 —— on hold —— 1 —— —— Constant current charging 0.1 120 3.7 —— on hold —— 1 —— —— Constant current charging 0.05 120 3.9 —— on hold —— 1 —— ——

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Abstract

The invention provides a lithium ion battery and a charging and discharging method thereof. The lithium ion battery comprises a positive electrode, a negative electrode and an electrolyte, wherein the negative electrode comprises a negative electrode current collector and a negative electrode material arranged on the negative electrode current collector. The charging and discharging method comprises the step of charging and discharging the battery by adopting at least one constant-current charging and discharging process and at least one stepped charging process, wherein the charging voltage in the constant-current charging and discharging process is greater than the charging voltage in the stepped charging process. According to the invention, at least one stepped charging is carried out after constant-current charging and discharging, and the charging voltage of the two stages is controlled, so that the problem of lithium precipitation at the edge of the positive electrode is effectively relieved. Specifically, the battery polarization phenomenon is reduced by reducing the charging voltage. By adopting the stepped charging mode, the charging voltage and the charging current can be adjusted, the time of the whole charging and discharging process is shortened, and the battery production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery and a charging and discharging method thereof. Background technique [0002] Lithium battery is the fastest growing item in the new energy industry, and has been applied to people's daily life, especially digital products and the automotive industry. Laminated batteries are increasingly used in the automotive and energy storage industries due to their own advantages. The wider it is, especially the stacked long cells (cells with a length of more than 500mm). [0003] Due to the advantage of the size of the long battery cell, the battery is easier to be used in the assembly of cars and energy storage. However, due to the long length of the pole piece of the long battery cell, after several charge-discharge cycles, lithium precipitation will occur on the edge of the negative pole piece ( Such as figure 1 shown), from figure 1 The elliptical fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/44H01M10/0525Y02E60/10
Inventor 马毅张浩伟苏夏侯月朋杨树涛
Owner SVOLT ENERGY TECHNOLOGY CO LTD