Method for quickly generating lamination flexible package lithium ion battery
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A lithium-ion battery and formation method technology, which is applied in the field of rapid formation of laminated flexible packaging lithium-ion batteries, can solve the problems of poor battery consistency, long time required for formation, and low production efficiency.
Active Publication Date: 2016-11-09
CAMEL GRP NEW ENERGY BATTERY CO LTD
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Problems solved by technology
[0004] The existing laminated flexible packaging lithium-ion battery formation process is generally to charge the battery continuously at a constant current to 50% to 100% SOC at room temperature, which takes a long time for formation and low production efficiency
And because the pressure of the formation battery is small and the temperature is not controlled, the gas production and temperature changes during the formation will lead to worse battery consistency
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Embodiment 1
[0021] The type of battery used in this example is a laminated soft-packaged lithium-ion battery.
[0022] In the rapid chemical formation method described in this embodiment, the formation of a solid electrolyte phase boundary film (SEI film) comprises the following steps:
[0023] Step 1, pre-pressing: use high-temperature pressurization to form a jig, and pre-press the laminated flexible-packaged lithium-ion battery at a pressure of about 0.1MPa. At the same time, pre-heat to a temperature of 35°C, and keep the whole pre-pressing process for 20 minutes;
[0024] Step 2, Formation: After the pre-compression is completed, keep the pre-compression pressure and pre-heating temperature, and use 0.08C to charge the lithium battery with a constant current until the charging capacity reaches 12% of the reversible capacity of the battery.
[0025] The rapid chemical formation method described in this embodiment, the gas discharge stage, includes the following steps:
[0026] Step 1...
Embodiment 2
[0031] The type of battery used in this example is a laminated soft-packaged lithium-ion battery.
[0032] In the rapid chemical formation method described in this embodiment, the formation of a solid electrolyte phase boundary film (SEI film) comprises the following steps:
[0033] Step 1, pre-pressing: use high-temperature pressurization to form a jig, and pre-press the laminated flexible-packaged lithium-ion battery at a pressure of about 0.1MPa. At the same time, pre-heat to a temperature of 35°C, and keep the whole pre-pressing process for 20 minutes;
[0034] Step 2, formation: after the pre-compression is completed, maintain the pre-compression pressure and pre-heating temperature, and use 0.05C to charge the lithium battery with a constant current until the charging capacity reaches 8% of the reversible capacity of the battery.
[0035] The rapid chemical formation method described in this implementation example, the gas discharge stage, comprises the following steps: ...
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Abstract
The invention belongs to the technical field of lithium ion batteries and particularly relates to a method for quickly generating a lamination flexible package lithium ion battery. The method comprises a stage of forming a solid electrolyte phase interface film and a stage of discharging formation gas. The main theoretical foundation is that the solid electrolyte phase interface film is mainly formed at the initial stage of formation charging, accompanied with the discharging of the formation gas. The formation of an SEI film is subjected to the influences of current density and temperature and the like. Under a small current density, first organic lithium salt is formed on the surface of a cathode and then inorganic lithium salt is formed, so that the formed SEI film is denser, and ingredients are more stable. At this stage, a high-pressure pressurization formation mode is adopted, the reaction activity can be increased, the reaction is accelerated, battery surface pressure is increased, the ionic migration distance can be shortened, and formation efficiency and pole piece surface reaction consistency are improved. Compared with a conventional formation process, according to the method, the formation time is shortened, the formed SEI film is denser and more stable, and the method can be widely applied to industrial production.
Description
technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a rapid formation method of laminated soft-packaged lithium-ion batteries. Background technique [0002] Since the 1990s, lithium-ion battery technology has developed rapidly, and various new battery structures and material systems have been widely used. Laminated flexible lithium-ion batteries have the advantages of low cost, high volume specific energy, small internal resistance, and large heat dissipation area, and are widely used in the field of new energy vehicles. The early A123, Enerdel and Leaf all used this battery structure. Since 2010, the automotive power lithium-ion battery market has grown explosively, and higher requirements have been placed on the safety, consistency and cycle life of power lithium-ion batteries. More and more battery manufacturers have begun to use laminated flexible packaging structure to improve battery performance. ...
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