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A method for dividing the capacity of special-shaped lithium-ion batteries

A technology of lithium-ion batteries and ion batteries, which is applied in the manufacture of non-aqueous electrolyte batteries, electrolyte batteries, secondary battery charging/discharging, etc., and can solve problems such as long capacity division cycle, unfavorable factory production, and increased input cost of capacity division cabinets. , to achieve the effects of improving market competitiveness, reducing production costs, and shortening the time for volume distribution

Active Publication Date: 2016-09-07
DONGGUAN JOYSUN NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the manufacturing process of existing lithium-ion batteries, due to technical reasons, the actual capacity of each lithium-ion battery will be inconsistent, and the capacity will be divided after the formation process; but the existing lithium-ion battery capacity division process is more complicated, and the capacity division The cycle is long, and the charging stage only needs to be as long as 5.0h or more, and the qualified rate of capacity division is low, which leads to low efficiency of battery capacity division, restricts the delivery period of products, and easily causes a backlog of products in the capacity division process, and It increases the input cost of equipment such as capacity separation cabinets, which is not conducive to factory production. With the development of the lithium battery industry, the capacity separation process has become a key link that restricts production efficiency and product quality.

Method used

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  • A method for dividing the capacity of special-shaped lithium-ion batteries
  • A method for dividing the capacity of special-shaped lithium-ion batteries
  • A method for dividing the capacity of special-shaped lithium-ion batteries

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] For the heat-sealed special-shaped lithium-ion battery, the capacity is divided at room temperature. When dividing the capacity, it is not necessary to discharge first, but to charge directly. The specific capacity division steps are as follows:

[0021] First, carry out the first charging stage, charge at 2.0C constant current and constant voltage, cut-off current 0.02C to 4.2V, and put it aside for 5 minutes;

[0022] Then carry out the second discharge stage, discharge to 3.2V at 1200mA, and leave for 5min;

[0023] Carry out the second charging stage again, charge to 4.2V with 2.0C constant current and constant voltage, cut-off current 7mA, and put it aside for 5min;

[0024] Carry out the third charging stage again, charge to 4.2V with 0.02C constant current and constant voltage, cut-off current 7mA, and complete the capacity division.

[0025] Among them, 12 special-shaped lithium-ion batteries were randomly selected to record their charging time, and at the same...

Embodiment 2

[0027] For the heat-sealed special-shaped lithium-ion battery, the capacity is divided at room temperature. When the capacity is divided, it is not necessary to discharge first, but directly to the charging stage. The specific capacity division steps are:

[0028] First, carry out the first charging stage, charge at 3.0C constant current and constant voltage, cut-off current 0.02C to 4.2V, and put it aside for 5 minutes;

[0029] Then carry out the second discharge stage, discharge to 3.2V at 1200mA, and leave for 5min;

[0030] Carry out the second charging stage again, charge to 4.2V with 3.0C constant current and constant voltage, cut-off current 7mA, and put it aside for 5min;

[0031] Carry out the third charging stage again, charge to 4.2V with 0.02C constant current and constant voltage, cut-off current 7mA, and complete the capacity division.

[0032] Among them, 12 special-shaped lithium-ion batteries were randomly selected to record their charging time, and at the s...

Embodiment 3

[0034] For the heat-sealed special-shaped lithium-ion battery, the capacity is divided at room temperature. When the capacity is divided, it is not necessary to discharge first, but directly to the charging stage. The specific capacity division steps are:

[0035] First, carry out the first charging stage, charge at 4.0C constant current and constant voltage, cut-off current 0.02C to 4.2V, and put it aside for 5 minutes;

[0036] Then carry out the second discharge stage, discharge to 3.2V at 1200mA, and leave for 5min;

[0037] Carry out the second charging stage again, charge to 4.2V with 4.0C constant current and constant voltage, cut-off current 7mA, and put it aside for 5min;

[0038] Carry out the third charging stage again, charge to 4.2V with 0.02C constant current and constant voltage, cut-off current 7mA, and complete the capacity division.

[0039] Among them, 12 special-shaped lithium-ion batteries were randomly selected to record their charging time, and at the s...

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Abstract

The present invention relates to the technical field of preparation of lithium-ion batteries, in particular to a method for distributing the capacity of special-shaped lithium-ion batteries, which adopts high-current stage charging, and includes a first charging stage, a discharging stage and a second charging stage in sequence according to the steps, wherein the The charging current in the first charging stage is 2.0C-6.5C, and the charging current in the second charging stage is 2.0C-6.5C. The capacity dividing method of the present invention is relatively simple, has a high qualified rate of capacity dividing and good performance, and greatly shortens the capacity dividing time, so as to reduce the investment in capacity dividing production and improve the production efficiency of lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion batteries, in particular to a capacity separation method applied to special-shaped lithium-ion batteries in electronic cigarettes. Background technique [0002] As an important part of the new energy field, lithium-ion batteries have become a new hotspot in global economic development. Compared with traditional lead-acid batteries, nickel-metal hydride and nickel-cadmium batteries, lithium-ion batteries have higher specific capacity and longer cycle life. Long, good safety performance, has gradually replaced lead-acid batteries and nickel-metal hydride, nickel-cadmium and other batteries, widely used in mobile phones, notebooks and electric vehicles, etc., with the rapid development of these industries, the production and demand of lithium-ion batteries It will also increase day by day, with a broad market space. At present, for battery manufacturers, on the one hand, it is nec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 汤欣平何苏平陈志道李云
Owner DONGGUAN JOYSUN NEW ENERGY
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