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A lithium-ion battery and battery technology, applied in the direction of secondary batteries, electrochemical generators, non-aqueous electrolyte storage batteries, etc., can solve the problems of battery internal pressure increase, electrolyte overflow, long formation time, etc., to improve the discharge capacity , reduce the amount of sucking back, and improve the effect of gram capacity
Inactive Publication Date: 2018-11-30
HEFEI HENGNENG NEW ENERGY TECH
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The presence of these gases will lead to an increase in the internal pressure of the battery (closed formation) or electrolyte overflow during the escape process (open formation)
The method of patent No. 201410385721.9 can prevent the overflow of the electrolyte in the early stage of formation and reduce the occurrence of side reactions, but the formation time is long and the operation is complicated
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Embodiment 1
[0023] A lithium-ion battery isobaric formation method, comprising the following steps:
[0024] (1) Place the 78Ah square aluminum-shell lithium iron phosphate battery to be formed in the formation box, connect the line of the formation device, open the nitrogen inlet valve, let it pass for 15 minutes, pull out the sealing plug, and add a storage tank above the liquid injection hole of the battery. The liquid tank and the liquid storage tank are open to prevent the electrolyte from being sucked back;
[0025] (2) Close the nitrogen inlet valve, open the vacuum valve, pump to different pressures as described in Table 1, close the vacuum valve and heat the temperature in the box to 25°C;
[0026] (3) Set up the formation step, first charge to 3.0V with a constant current of 0.02C, then charge to 3.2-3.25V with a constant current of 0.1C, then charge to 3.5-3.55V with a constant current of 0.2C, and start the step of formation;
[0027] (4) After the formation is completed, ope...
Embodiment 2
[0033] A lithium-ion battery isobaric formation method, comprising the following steps:
[0034] (1) Place the 78Ah square aluminum-shell lithium iron phosphate battery to be formed in the formation box, connect the formation device line, open the nitrogen inlet valve, let it pass for 15 minutes, pull out the sealing plug, and add a storage tank above the liquid injection hole of the battery. The liquid tank and the liquid storage tank are open to prevent the electrolyte from being sucked back;
[0035] (2) Close the nitrogen inlet valve, open the vacuum valve, pump until the pressure of the box is -0.08MPa, close the vacuum valve, and heat the temperature in the box to the different temperatures described in Table 1;
[0036] (3) Set up the formation step, first charge to 3.0V with a constant current of 0.02C, then charge to 3.2-3.25V with a constant current of 0.1C, then charge to 3.5-3.55V with a constant current of 0.2C, and start the step of formation;
[0037] (4) After...
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Abstract
The invention relates to the field of lithium ion battery manufacturing, in particular to an isobaric formation method for a lithium ion battery. The method comprises the following steps that (1) thebattery to be formed is placed into a formation box, inert gas is introduced for 15 minutes, a sealing plug is pulled out, a liquid storage tank is additionally arranged above a liquid injection portof the battery and is open; (2) an inert gas inlet valve is closed, vacuumizing is carried out to reach -0.075 MPa to -0.09 MPa, a vacuum valve is closed, and heating is carried out to increase the temperature in the box to 20-35 DEG C; (3) the formation step is set and started; and (4) after formation is finished, the inert gas is introduced, and the liquid injection port of the battery is plugged with the sealing plug. According to the method, an isobaric formation technology is adopted, so that the sucking-back amount of electrolyte in the formation process can be decreased, in addition, gas generated in a battery cell in the formation process can be removed in time, the periphery of the battery cell is fully filled with the electrolyte, polarization caused by the concentration difference of lithium ions is reduced, so that a thin and dense SEI film is formed on the surface of a negative electrode, the direct current internal resistance and the alternating current internal resistance of the battery are reduced, the discharge capacity is improved, and therefore the capacity per gramme of the battery is improved.
Description
technical field [0001] The invention relates to the field of manufacturing lithium ion batteries, in particular to an isobaric formation method of lithium ion batteries. Background technique [0002] While the world's population is increasing and living standards are greatly improving, the demand for energy is also increasing sharply, and the gas emissions from fossil fuel and biomass combustion not only pollute the atmosphere, but also cause global warming to modern cities Therefore, developing alternative and sustainable clean energy is the most urgent task at present. Lithium-ion batteries are green and environmentally friendly batteries that appeared in the 1990s. They have outstanding advantages such as high energy density, environmental friendliness, no memory effect, long cycle life, and low self-discharge. They are not only ideal power sources for small and lightweight portable electronic products, It is also an ideal light-duty high-energy power source for future e...
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