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A technology of lithium ion battery and formation method, applied in the field of lithium ion battery formation, can solve the problems of easy generation of air bubbles, poor gas extraction effect, lithium precipitation and the like
Active Publication Date: 2018-03-06
CALB CO LTD
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Problems solved by technology
The air pumping effect of this invention is not good, and air bubbles are easily generated between the pole
Method used
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Embodiment approach 1
[0039] Step 1: Vacuum the lithium battery until its internal negative pressure is -0.08Mpa, and let it stand for 3 minutes;
[0040] Step 2: Charge the lithium battery to 5% SOC with a charging current of 0.03C under the condition that the internal negative pressure of the lithium battery is -0.08Mpa, and break the vacuum to zero negative pressure after charging is completed;
[0041] Step 101: Stand still for 1 min in a vacuum-breaking zero negative pressure environment;
[0042] Step 102: evacuate until the internal negative pressure of the lithium battery is -0.08Mpa, and let stand for 1min;
[0043] Step 4: Charge the lithium battery to 15% SOC with a charging current of 0.1C under the condition that the internal negative pressure of the lithium battery is -0.08Mpa, and break the vacuum to zero negative pressure after charging is completed;
[0044] Step 101: Stand still for 1 min in a vacuum-breaking zero negative pressure environment;
[0045] Step 102: evacuate until ...
Embodiment approach 2
[0050] Step 1: Vacuum the lithium battery until its internal negative pressure is -0.06Mpa, and let it stand for 3 minutes;
[0051] Step 2: Charge the lithium battery to 5% SOC with a charging current of 0.03C under the condition that the internal negative pressure of the lithium battery is -0.06Mpa, and break the vacuum to zero negative pressure after charging is completed;
[0052] Step 101: Stand still for 1 min in a vacuum-breaking zero negative pressure environment;
[0053] Step 102: Vacuumize until the internal negative pressure of the lithium battery is -0.06Mpa, and let stand for 1min;
[0054] Steps 101, 102 cycle once;
[0055] Step 4: Charge the lithium battery to 15% SOC with a charging current of 0.1C under the condition that the internal negative pressure of the lithium battery is -0.06Mpa, and break the vacuum to zero negative pressure after charging is completed;
[0056] Step 101: Stand still for 1 min in a vacuum-breaking zero negative pressure environmen...
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Abstract
The invention belongs to the manufacturing technical field of a lithium ion battery, particularly a lithium ion battery formation method. The formation method comprises the following steps of 1, performing standing for 3min or above on the internal negative pressure condition of the lithium battery; 2, charging to 4-6% of SOC at the internal negative pressure condition of the lithium battery; 3, performing one or more times of respiration type vacuum pumping-breaking operation; 4, charging to 10-25% of SOC at the internal negative pressure condition of the lithium battery; 5, performing one ormore times of respiration type vacuum pumping-breaking operation; 6, charging to 50% of SOC or above at the internal negative pressure condition of the lithium battery; and 7, performing standing for1min in a vacuum-breaking zero negative pressure environment, and finishing formation. By adoption of the method, lithium ion formation is performed in the respiration manner, so that gas in the lithium battery can be discharged effectively, and the pole piece distances of the lithium battery can be the same; and therefore, the lithium battery formation interface is uniform and tidy, and a betterformation effect is achieved.
Description
technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, in particular to a lithium ion battery formation method. Background technique [0002] Formation is an essential process in the production process of lithium batteries, which plays a vital role in the performance of lithium batteries. Especially for soft pack lithium batteries, formation not only has the functions of activating battery materials, improving the interface of lithium batteries, self-discharging, and cycling, but also has the functions of enhancing battery hardness and shaping. In order to save production time, improve labor efficiency, and reduce costs, soft-pack lithium batteries have begun to adopt high-temperature, high-voltage, and high-current formation processes. Formation under high temperature and high pressure can not only improve the promotion of separators, but the traditional hot-press formation process has problems of softening and lithium prec...
Claims
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