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Secondary lithium ion battery and electric capacity improving method thereof

A technology for lithium-ion batteries and battery casings, applied in secondary batteries, battery pack components, non-aqueous electrolyte storage batteries, etc., can solve the problems of increased cost, fast capacity decay, and low liquid injection volume, so as to ensure that the product is qualified efficiency, capacity maximization, and good cycle performance

Inactive Publication Date: 2012-01-18
DONGGUAN YISHENG BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The capacity of lithium-ion batteries depends on the selection of raw materials and the utilization rate of the internal space of the battery case. Due to the thicker wall thickness of the battery case, the battery thickness space is relatively reduced. In terms of process design, the thickness of the battery core should be controlled to a smaller range. , so it affects the internal space of the entire battery, the volume is small, the liquid injection volume is low, resulting in low capacity, fast capacity decay, poor cycle performance, and low life
In addition, in the prior art, liquid injection in two steps (i.e. refilling liquid after battery formation) is generally used to solve these problems. However, this process not only wastes manpower, reduces efficiency, increases cost, but also affects product qualification. Rate

Method used

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  • Secondary lithium ion battery and electric capacity improving method thereof
  • Secondary lithium ion battery and electric capacity improving method thereof

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing, the present invention will be further described:

[0014] Such as figure 1 As shown, a secondary lithium ion battery according to the present invention has a structure as follows: it includes a battery case 1, a liquid injection space 5 is provided inside the battery case 1, and a connected liquid injection space 5 is provided inside the battery case 1 The liquid injection hole 4, which also includes an air bag 2 made of polypropylene film and injected with a sufficient amount of electrolyte, which can be called a PP air bag, the air bag 2 is provided with an opening 3, and one end of the opening 3 of the air bag 2 extends into Connected to the injection hole 4. Further, the connection between the opening 3 and the liquid injection hole 4 adopts a sealed structure to ensure that the electrolyte in the airbag 2 does not leak out and maintain the sealing of the liquid injection space 5 . Further, the opening 3 is an invert...

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Abstract

The invention relates to the technical field of lithium ion batteries, and especially relates to a secondary lithium ion battery, and a method used for improving the electric capacity of the secondary lithium ion battery. The method provided by the invention comprises steps that: an air sac is produced form a polypropylene film, and sufficient electrolyte is filled in the air sac; an inverted U-shaped port of the air sac is extended into a liquid filling hole, and the inverted U-shaped port and the liquid filling hole form a sealed connection; when the secondary lithium ion battery is formed, a liquid filling space in the battery generates gas which is discharged upwards into the air sac; the electrolyte in the air sac flows into the liquid filling space in the battery for supplementing electrolyte consumed by battery formation. With the method provided by the invention, under a condition that a battery housing and a battery core are not changed, the electric capacity is optimized, the capacity attenuation is slow, the circulation performance is good, and the service life is long. With the method, efficiency can be improved, cost can be reduced, and product qualification rate can be ensured.

Description

Technical field: [0001] The invention relates to the technical field of lithium ion batteries, in particular to a secondary lithium ion battery and a method for increasing its capacity. Background technique: [0002] Lithium-ion batteries have the advantages of high voltage, large capacity, long cycle life, no memory effect, light weight, and wide operating range. At present, the market has higher and higher requirements for the performance and capacity of lithium-ion batteries, which not only require the battery to have a high initial capacity, but also require the battery to have a good capacity retention rate in the process of repeated charging and discharging, showing good performance. Has a long service life. The capacity of lithium-ion batteries depends on the selection of raw materials and the utilization rate of the internal space of the battery case. Due to the thicker wall thickness of the battery case, the battery thickness space is relatively reduced. In terms o...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M2/36H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 黄奕陆子新
Owner DONGGUAN YISHENG BATTERY
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