Lithium battery manufacturing process

A manufacturing process, lithium battery technology, applied in the direction of sustainable manufacturing/processing, secondary battery, final product manufacturing, etc., can solve the problems of battery performance degradation, inability to completely remove battery core moisture, etc.

Inactive Publication Date: 2019-04-26
SHENZHEN ZHUONENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the present invention discloses a lithium battery manufacturing process, which is used to solve the problem that in the existing lith

Method used

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  • Lithium battery manufacturing process

Examples

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Effect test

Embodiment 1

[0077] see figure 1 , Embodiment 1 of the present invention provides a lithium battery manufacturing process S100, including:

[0078] Preparation process S10, preparing pole pieces or winding cores;

[0079] The first baking process S20, putting the pole piece or the winding core into an oven for baking;

[0080] Assembling process S30, winding the pole piece after the first baking process into a winding core, and installing the winding core inside the battery case with an opening at one end to make a semi-finished battery, or, after the first baking process, The winding core in a baking process is installed inside the battery case with an open end to make a semi-finished battery;

[0081] The second baking process S40, putting the semi-finished battery that has completed the assembly process into an oven for baking;

[0082] Injection and wetting process S50, injecting an electrolyte solution into the semi-finished battery that has completed the second baking process to i...

Embodiment 2

[0134] The difference between this embodiment and Embodiment 1 is mainly that the material of the positive electrode coating is different, and the specific formation steps are also different, specifically reflected in: in this embodiment, the positive electrode coating includes a ternary material (nickel cobalt lithium manganese oxide) , the chemical conversion step S80 includes:

[0135] The first step is to charge the finished battery with a constant current of 0.2C, and during the charging process, set the upper limit of the charging voltage to 4200-4400mV, and the entire charging time is 120min;

[0136] The second sub-step is to charge the finished battery that has completed the first sub-step with a constant current of 0.3C, and set the upper limit of the charging voltage to 4200-4400mV during the charging process. When the charging voltage rises to the set value, Keep the charging voltage constant, then control the charging current to gradually drop to 0.01C, stop charg...

Embodiment 3

[0146] The difference between this embodiment and Embodiment 1 is mainly that the material of the positive electrode coating is different, and the specific formation steps are also different, specifically reflected in: in this embodiment, the positive electrode coating includes a ternary material (nickel cobalt lithium manganese oxide) , the chemical conversion step S80 includes:

[0147] The first sub-step is to charge the finished battery with a constant current of 0.02C, and during the charging process, set the charging upper limit voltage to 3850mV, and the entire charging time is 60min;

[0148] The second sub-step is to charge the finished battery after the first sub-step with a constant current of 0.1C, and during the charging process, set the charging upper limit voltage to 3850mV, and the entire charging time is 120min;

[0149] The third sub-step is to charge the finished battery after completing the second sub-step with a constant current of 0.2C, and during the cha...

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Abstract

The invention discloses a lithium battery manufacturing process which comprises a preparation process, a first baking process, an assembly process, a second baking process, a liquid injection wettingprocess, a sealing process, a shelving wetting process and a formation process. The lithium battery manufacturing process includes conducting the first baking process on a pole piece or a core to remove some moisture in the pole piece or the core, then conducting the second baking process to bake a semi-finished battery to effectively remove the moisture inside the battery to improve the overall performance of the battery. A user does not need to increase the drying temperature or prolong the baking time significantly during the baking process, no negative impact is generated on the performance of the battery, and no more energy consumption is caused. In addition, the semi-finished battery is first subjected to liquid injection wetting by setting and then subjected to shelving wetting. Theshelving wetting includes first inverted wetting and then upright wetting, so that the core wetting effect is better, and the overall performance of a finished battery is improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium battery manufacturing process. Background technique [0002] Inorganic lithium salts are important components in the electrolyte of ion batteries. Since inorganic lithium salts meet with water, they will produce a chemical reaction, which seriously affects the overall performance of the battery. Therefore, in the manufacturing process of lithium-ion batteries, the removal of moisture inside the battery is particularly important. There is a baking process in the existing lithium battery manufacturing process, which uses a vacuum oven to bake and remove water. For cylindrical lithium-ion batteries with larger diameter and higher height (for example, diameter ≥ 18mm, height ≥ 65mm), it is generally used to prolong the baking time or increase the baking temperature to reduce the moisture inside the battery. However, there are some defects in this method. Since the inside ...

Claims

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Application Information

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IPC IPC(8): H01M10/0587
CPCH01M10/0587Y02E60/10Y02P70/50
Inventor 李亮黄国文许博爱欧瑞先
Owner SHENZHEN ZHUONENG NEW ENERGY TECH
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