Preparation method of lithium ion battery formed at normal pressure and sealed at negative pressure

A lithium-ion battery and sealing technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, and final product manufacturing, etc., can solve the problem of high cost of gas production equipment, and achieve the advantages of ensuring electrochemical performance, reducing internal pressure, and increasing battery costs. Effect

Inactive Publication Date: 2017-06-13
ZHONGTIAN ENERGY STORAGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of gas production and high equipment cost during the opening formation of square lithium-ion batteries, and now provides a device that can effectively discharge the

Method used

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  • Preparation method of lithium ion battery formed at normal pressure and sealed at negative pressure

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preparation example Construction

[0017] A method for preparing a negative pressure sealed lithium-ion battery by normal pressure formation, the specific steps are as follows:

[0018] (1) Put the injected lithium-ion battery into the battery formation cabinet, and the formation cabinet is in the dew point environment of -25~-45°C;

[0019] (2) Then conduct battery formation, the formation current is 0.05-0.15C, and the charging time is 60-360min;

[0020] (3) After the battery is formed, put the battery in a vacuum box to exhaust, and keep it at -50~-90Kpa for 5~15min;

[0021] (4) After the battery is exhausted, put steel balls into the seal under the condition of -50 ~ -90Kpa to complete the preparation of the battery.

[0022] Feasible, the dew point of the environment where the chemical formation cabinet is located in step (1) is controlled at -25 to -35°C.

[0023] Feasible, the formation current in step (2) is 0.05-0.1C, and the charging time is 150-300min.

[0024] Feasible, the pressure in the vacu...

Embodiment 1

[0027] A kind of normal pressure into negative pressure sealing lithium-ion battery preparation method, it comprises the steps:

[0028] (1) Put the liquid-injected lithium-ion battery into the battery formation cabinet, and the formation cabinet is in a dew point environment of -25°C;

[0029] (2) For battery formation, use 0.05C current and charge for 300min;

[0030] (3) After the battery is formed, put the battery in a vacuum box to exhaust, and keep it at -50Kpa for 15 minutes;

[0031] (4) After the battery is exhausted, seal it with steel balls at -60Kpa to complete the preparation of the battery.

Embodiment 2

[0033] A kind of normal pressure into negative pressure sealing lithium-ion battery preparation method, it comprises the steps:

[0034] (1) Put the injected lithium-ion battery into the battery formation cabinet, and the formation cabinet is in a dew point environment of -35°C;

[0035] (2) For battery formation, use 0.1C current and charge for 150 minutes;

[0036] (3) After the battery is formed, put the battery in a vacuum box to exhaust, and keep it at -80Kpa for 10 minutes;

[0037] (4) After the battery is exhausted, seal it with steel balls at -80Kpa to complete the preparation of the battery.

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Abstract

The invention discloses a preparation method of a lithium ion battery formed at normal pressure and sealed at negative pressure. The preparation method comprises the following specific steps: a liquid-injected lithium ion battery is put into a battery formation cabinet, and the formation cabinet is in a dew point environment of minus 25 DEG C to minus 45 DEG C; battery formation is then carried out while forming current is 0.05-0.15 C and charging time is 60-360 min; after completion of battery formation, the battery is put into a vacuum chamber for exhausting and the process is maintained at minus 50 to minus 90 Kpa for 5-15 min; and after battery exhausting, steel balls are beaten for sealing under the condition of minus 50 to minus 90 Kpa, and preparation of the battery is finished. By the mode of controlling the dew point of the environment, the influence of moisture on the battery during formation is reduced; and after formation, by exhausting and negative-pressure sealing of the battery, gas inside the battery is discharged to reduce pressure inside the battery and electrochemical performance of the battery is guaranteed. There is no need to increase investment in equipment; battery cost is not raised; and market competitiveness of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery preparation, and in particular relates to a preparation method of a negative-pressure sealed lithium-ion battery formed at normal pressure. Background technique [0002] As we all know, lithium-ion battery is a secondary environment-friendly battery with high energy density, long cycle life and high volume-to-energy ratio. With the improvement of people's awareness of environmental protection and the pursuit of a healthy living environment, pure electric vehicles or hybrid vehicles have developed rapidly. The prismatic lithium-ion battery has become the first choice for power batteries because of its structural performance and other factors that meet the assembly requirements of power battery packs. [0003] Compared with common cylindrical lithium-ion batteries, due to the structural characteristics of square lithium-ion batteries, once gas is generated inside the battery and the int...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 钱宝明王宾杨伟吕林李文生薛驰徐洲
Owner ZHONGTIAN ENERGY STORAGE TECH
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