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Drying method of pole pieces of lithium-ion secondary battery

A drying method and secondary battery technology, applied in battery electrodes, dryers for static materials, drying of solid materials, etc., can solve the problems of low gram capacity, poor cycle performance, large self-discharge, etc., and achieve the effect of improving battery performance.

Active Publication Date: 2011-08-10
奇瑞新能源汽车股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the divalent iron of lithium iron phosphate is oxidized to ferric iron, which has large self-discharge, poor cycle performance, and low gram capacity.

Method used

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  • Drying method of pole pieces of lithium-ion secondary battery
  • Drying method of pole pieces of lithium-ion secondary battery
  • Drying method of pole pieces of lithium-ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0024] figure 1 It is a flow chart of the drying method of the pole piece of the lithium ion secondary battery according to the first embodiment of the present invention. Such as figure 1 Described, this drying method comprises the following steps:

[0025] Step 1. Put the positive and negative electrode coils into the box separately

[0026] In this step, put the coiled material into the tray in the drying box, and the tray should be clean. The purpose of this step is to avoid mixed contact of positive and negative materials and cross-contamination, so as to avoid the above-mentioned adverse effects.

[0027] Step 2. Vacuum

[0028] In this step, vacuumize the drying box to -0.1 MPa and then continue to pump for 1 to 30 minutes to close the vacuum system. The purpose of this step is to allow the coil to dry without air contact in the drying oven.

[0029] Step 3, heating

[0030] In this step, the heater is used to heat the drying box, wherein the heating temperature is...

no. 2 example

[0039] In order to further ensure that the moisture in the coil material is completely discharged, this embodiment repeats the cycle of ventilation for 5 to 20 times on the basis of the first embodiment before turning off the heater. The ventilation includes: filling inert after a certain period of time Gas (step 4) and vacuum after a certain time (step 5).

[0040] figure 2 is a schematic flow chart of a drying method for lithium-ion secondary battery pole pieces according to the second embodiment of the present invention. exist figure 2 , cycle and ventilate 5 times, that is, repeat "holding time" → "nitrogen filling" → "holding time" → "vacuumize" 5 times.

[0041] Below, the test data will be used to illustrate the battery performance comparison of different drying times.

[0042] image 3 It is a graph showing the test results of Scheme 1. The process flow of Scheme 1 is: powder baking→slurry preparation→coating→rolling→slicing→slice selection→lamination→assembly→we...

no. 3 example

[0046] This embodiment provides a pole piece manufacturing method for a lithium-ion secondary battery, which is characterized in that the positive pole piece and the negative pole piece are manufactured separately, that is, the entire manufacturing process of the positive pole piece manufacturing process and the negative pole piece are implemented separately. Through this pole piece manufacturing method, the moisture in the coil material can be fully discharged, the performance of the battery can be improved to the greatest extent, and the potential safety hazard caused by battery swelling can be eliminated.

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Abstract

The invention provides a drying method of pole pieces of a lithium-ion secondary battery, which comprises the following steps of: respectively drying an anode coil stock and a cathode coil stock; placing the coil stocks into a pallet in a drying box; vacuumizing the drying box to -0.1MPa, then continuously vacuumizing for 1-30 minutes, and closing; heating the drying box by utilizing a heater; filling inert gas into the drying box after 2-10 hours, and stopping until the pointer of a vacuum meter reaches -0.01MPa; exchanging the inert gas with moisture in the drying box for 5-30 minutes, vacuumizing the drying box to -0.1MPa, then continuously vacuumizing for 1-30 minutes, and closing; and closing the heater, and taking the coil stocks out of the drying box to be rolled after the temperature drops to the indoor temperature. The drying method provided by the invention can be used for completely eliminating the moisture in the coil stocks of the pole pieces, thereby improving the performance of the battery and eliminating the potential safety hazards caused by the ballooning of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for drying pole pieces of lithium ion secondary batteries. Background technique [0002] Lithium-ion secondary batteries have the characteristics of high energy, long cycle life, stable structure, good safety performance, low cost, no toxic and harmful substances, and no pollution to the environment. They are currently widely used in electronic instruments, digital and home appliances (such as , mobile phones, digital cameras, notebook computers), and can also be applied to the preparation of high-capacity and high-power power batteries. [0003] The manufacturing process of the traditional lithium-ion secondary battery pole piece is as follows: first, solvent, binder, conductive agent, positive / negative electrode active material, etc. are added to the mixing tank in order according to the process requirements and stirred to obtain a slurry; then, The fini...

Claims

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Application Information

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IPC IPC(8): F26B7/00F26B9/10
CPCH01M4/139Y02E60/122Y02E60/10
Inventor 高亮
Owner 奇瑞新能源汽车股份有限公司
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