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A kind of lithium-ion battery forming method

A technology of lithium ion battery and formation method, applied in the field of lithium ion battery formation, can solve the problems of battery current difference, different SEI film structure and performance, etc., and achieve the effect of good internal resistance consistency, excellent cycle performance, and consistency guarantee.

Active Publication Date: 2019-07-19
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, the SEI film has been basically formed in the middle and late stages of formation, and its structure and performance have a lot to do with the formation charging current. Most of the existing formation processes are parallel formation of batteries. This method ensures the same voltage of the batteries, but due to the The battery current will be different due to the difference or the limitation of the formation equipment, so the structure and performance of the SEI film at the electrode surface material interface will also be different

Method used

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  • A kind of lithium-ion battery forming method

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Effect test

Embodiment

[0017] Make a square aluminum shell battery with a model number of 20100140, with a capacity of 25Ah. The pre-production of the battery is the same as that of the production line battery, and its formation is carried out as follows:

[0018] 1. Connect the batteries in series;

[0019] 2. Stand still for 5 minutes;

[0020] 3. Constant current charging: 0.02C charging, limited voltage 3.2V, limited time 240min;

[0021] 4. Stand still for 5 minutes;

[0022] 5. Change the battery to parallel connection;

[0023] 6. Constant current and constant voltage charging: 0.2C charging, cut-off voltage 3.65V, cut-off current 0.02C; time limit 240min;

[0024] 7. Stand still for 5 minutes;

[0025] 8. Test the battery voltage, pick out the battery whose voltage is less than 3.3V, and perform secondary formation according to steps 1 to 7.

[0026] The lithium-ion battery of this embodiment was tested for electrical performance, and the capacity, internal resistance and capacity reten...

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Abstract

The invention relates to the field of a lithium ion battery, and discloses a formation method for the lithium ion battery. The formation method is mostly characterized in that the batteries are connected in series and then are formed; after a certain voltage is reached, the batteries are connected in parallel; and next, the batteries are formed until a cut-off voltage is reached. According to the formation method, based on the characteristic that the series circuits have the completely consistent current, the lithium batteries are formed at the same current at the initial formation stage, so that an SEI film with quite high consistency can be formed; the lithium batteries are formed in a shunt-wound manner at the last formation stage; and due to the factor that the shunt circuits have the same voltage, the consistency of the battery voltage is ensured.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery formation method. Background technique [0002] With the demand for environmental protection and energy tensions, the demand for power batteries has shown explosive growth. Although the safety and performance of power batteries have been greatly improved with the advancement of technology, the consistency of batteries still affects power batteries. One of the important factors of group performance. [0003] Among the many processes of battery production, formation is a particularly important part. Its main purpose is to form a layer of solid electrolyte film (SEI film) on the surface of the electrode material during the first charging process. The performance of the SEI film will directly determine the performance of the battery. Cycle performance and battery consistency. In fact, the SEI film has been basically formed in the middle and late stages of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44
CPCH01M10/446Y02E60/10
Inventor 陈峰张炎斌王海波
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY