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Lithium battery manufacturing process

A manufacturing process, lithium battery technology, applied in secondary battery manufacturing, sustainable manufacturing/processing, secondary batteries, etc., can solve the problems of lower overall battery performance, lower battery performance, and lithium deposition in negative electrode sheets.

Inactive Publication Date: 2019-06-07
SHENZHEN ZHUONENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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 lithium battery manufacturing process, the lithium battery drying process cannot completely remove the moisture inside the battery core or cause the performance of the battery to decrease And the infiltration effect of the electrolyte is not good, causing the phenomenon of lithium precipitation on the negative electrode sheet, resulting in the reduction of the overall performance of the battery

Method used

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  • Lithium battery manufacturing process

Examples

Experimental program
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Effect test

Embodiment 1

[0075] see figure 1 , Embodiment 1 of the present invention provides a lithium battery manufacturing process S100, including:

[0076] Preparation process S10, preparing pole pieces or winding cores;

[0077] The first baking process S20, putting the pole piece or the winding core into an oven for baking;

[0078] 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;

[0079] The second baking process S40, putting the semi-finished battery that has completed the assembly process into an oven for baking;

[0080] Liquid injection and soaking process S50, after completing the second baking process, at a temperature of T 1 Electrolyte is injected into the semi-...

Embodiment 2

[0130] 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:

[0131] 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;

[0132] 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

[0142] 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:

[0143] 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;

[0144] 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;

[0145] 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 lithium battery manufacturing process. The process includes a pretreatment process, a first baking process, an assembling process, a second baking process, a liquid injection infiltration process, a sealing process, a shelving infiltration process and a formation process. Through the baking of the first and second baking processes, moisture at the internal of a battery canbe efficiently removed, so that the integration performance of the battery can be enhanced, baking temperature and baking time do not need to be greatly enhanced during baking, negative influences onthe performance of the battery cannot be generated, and larger energy consumption cannot be brought; in addition, in the liquid injection infiltration process, phenomenon of lithium precipitation cannot occur on a pole piece by enhancing the temperature of semi-finished batteries, increasing vacuum pressure after liquid injection and prolonging dwell time, so that infiltration effects of an electrolyte can be effectively enhanced; and further, the energy density of the lithium batteries can be effectively increased by increasing the content of positive and negative active materials and the injection volume of the electrolyte.

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): H01M10/0587H01M10/04H01M10/44
CPCY02E60/10Y02P70/50
Inventor 李亮黄国文欧瑞先
Owner SHENZHEN ZHUONENG NEW ENERGY TECH
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