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Formation method capable of prolonging cycle life of soft package power battery, battery formation clamp, applications and soft package power battery

A technology of power battery and formation method, which is applied in the direction of secondary battery charging/discharging, small-size battery/battery pack, large-size battery/battery pack, etc., which can solve the problem of inconsistent electrolyte absorption and shortened battery life , irreversible capacity increase and other issues, to achieve the effect of shortening the pre-charging processing time, increasing the battery capacity, and improving the long time of seepage

Pending Publication Date: 2018-07-20
BEIJING NAT BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current formation methods of soft-pack power batteries have the following defects: (1) The time of seepage is long, the energy consumption is high when standing at high temperature, the standing effect is poor, and the degree of electrolyte absorption is inconsistent; (2) The formation current is small and time-consuming If it is too long, the SEI film is uneven and the stability is poor; (3) due to the unevenness and instability of the SEI film on the electrode surface during formation, the SEI film will be repeatedly damaged and repaired during the cycle, resulting in an increase in irreversible capacity and a long battery life. shorten

Method used

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  • Formation method capable of prolonging cycle life of soft package power battery, battery formation clamp, applications and soft package power battery
  • Formation method capable of prolonging cycle life of soft package power battery, battery formation clamp, applications and soft package power battery
  • Formation method capable of prolonging cycle life of soft package power battery, battery formation clamp, applications and soft package power battery

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Embodiment approach

[0085] As a preferred embodiment of the present invention, the cycle life of the pouch power battery is increased to 20-50%. Typical but non-limiting percentage improvements in cycle life for pouch power batteries are 25%, 30%, 35%, 40%, 45% or 50%.

[0086] The present invention also provides a battery formation jig used in the formation method for improving the cycle life of the pouch power battery. The specific structure is as follows: Figure 1-5 shown.

[0087] Specifically, the battery forming fixture includes a first splint 21, a second splint 22 and a clip 30, the first splint 21, the second splint 22 and the clip 30 are detachably connected, the first splint 21 and the second splint 22 All are insulating splints, and the clip 30 is an elastic member;

[0088] The first splint 21 and the second splint 22 are respectively placed on the two surfaces of the battery 10, the battery 10 is located between the first splint 21 and the second splint 22, and the clip 30 is use...

Embodiment 1

[0114] A method for improving the cycle life of a pouch power battery provided in this embodiment includes the following steps:

[0115] (a) Place the battery that has been injected in vacuum, and the vacuum pressure of the vacuum standing is divided into 5 steps, and the vacuum pressure of each step is -40kPa, -50kPa, -65kPa, -80kPa and -85kPa, respectively. The resting time is 10s;

[0116] Vacuum sealing is carried out after vacuum standing, and the vacuum pressure of vacuum sealing is -80kPa;

[0117] (b) Place the vacuum-sealed battery in a battery forming jig for aging. The aging method is pressure standing, the temperature of pressure standing is 35°C, and the time of pressure standing is 25 hours;

[0118] (c) Precharge the battery placed in the battery forming fixture after standing under pressure, according to the following steps:

[0119] c1, stand still;

[0120] c2. Charge at 0.02C constant current for 20 minutes, and the upper limit voltage is 3900mV;

[0121...

Embodiment 2

[0127] The formation method provided in this embodiment to improve the cycle life of the pouch power battery is the same as that of Embodiment 1 except that the pressure of the battery formation jig acting on the battery in steps (b)-(d) is 400 kg.

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Abstract

The invention provides a formation method capable of prolonging the cycle life of a soft package power battery, a battery formation clamp, applications and the soft package power battery and relates to the technical field of soft package power batteries. The formation method comprises the steps of adopting multi-echelon vacuum standing and vacuum sealing treatment on the battery subject to liquidinjection, putting the vacuum sealed battery into the battery formation clamp for carrying out the steps of aging, precharge treatment and standing, wherein an immersion method of echelon vacuum standing is adopted after liquid injection, so that the absorption rate of an electrolyte can be reduced and the drainage time is shortened; pressure standing is adopted in the aging process, so that infiltration of the electrolyte can be fuller under certain pressure; and the battery formation clamp is adopted for precharge treatment, so that a positive plate and a negative plate of the battery can bein close contact, the formed SEI film is consistent in components, and the surface thickness is uniform and stable. The invention further provides the battery formation clamp. The clamp is simple instructure, convenient to use and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of battery formation, in particular to a formation method for improving the cycle life of a soft pack power battery, a battery formation jig and its application, and a soft pack power battery. Background technique [0002] Since the soft-pack power battery is packaged with aluminum-plastic composite film, compared with the hard-shell battery, it has the characteristics of lighter weight, larger capacity, smaller internal resistance, flexible design, and higher safety when using the same raw materials. It is favored by more and more new energy car companies and power battery manufacturers. [0003] The formation process of soft-pack power batteries, especially large-capacity soft-pack power batteries (above 50Ah), is an important process in the production process, which has special process requirements and technical difficulties. Formation is the process of charging the battery for the first time after liqui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44H01M2/02H01M50/10
CPCH01M10/42H01M10/446H01M50/10Y02E60/10
Inventor 樊海英吴丛笑郭伟文哲泽刘阳
Owner BEIJING NAT BATTERY TECH
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