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Capacity grading method for specially-shaped lithium ion batteries

A lithium-ion battery, ion battery technology, applied in non-aqueous electrolyte battery, electrolyte battery manufacturing, secondary battery charging/discharging, etc. problems, to achieve the effect of improving market competitiveness, simplifying the capacity distribution process, and shortening the capacity distribution time.

Active Publication Date: 2015-03-11
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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  • Capacity grading method for specially-shaped lithium ion batteries
  • Capacity grading method for specially-shaped lithium ion batteries
  • Capacity grading method for specially-shaped lithium ion batteries

Examples

Experimental program
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 invention relates to the technical field of preparation of lithium ion batteries, particularly to a capacity grading method for specially-shaped lithium ion batteries. The method adopts large-current staged charging and sequentially comprises steps as follows: a first charging stage, a discharging stage and a second charging stage, wherein the charging current of the first charging stage is in a range of 2.0 C-6.5 C, and the charging current of the second charging stage is in a range of 2.0 C-6.5 C. The capacity grading method is relatively simple, the capacity pass percent of capacity grading is high, the performance is good, and the capacity grading time is greatly shortened, so that the capacity grading production input is reduced, and the production efficiency of the lithium ion batteries is improved.

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 Applications(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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