Vacuum formation method of lithium ion battery

Abstract

The invention discloses a vacuum formation method of a lithium ion battery. In the method, an electrolyte injection process and a formation process of the battery are completed by adopting an integrated fixture with electrolyte-injecting and charging functions and a vacuum formation device with charging and vacuumizing functions. The vacuum formation device charges the battery arranged in the integrated fixture, and the battery is electrically connected with the vacuum formation device by the integrated fixture. The vacuum formation method of the invention provides an enclosed and controllable microenvironment, thereby reducing electrolyte waste, avoiding overflow loss of electrolyte and corrosion on a battery casing, the fixture or charging equipment, and effectively reducing environmental pollution.

Description

technical field

[0001] The invention relates to a manufacturing and processing method of a lithium-ion battery, and more specifically, to a vacuum formation method of a lithium-ion battery. Background technique

[0002] In recent years, with the emphasis on the non-renewable energy crisis and environmental protection, the application of green and environmentally friendly lithium-ion batteries in mobile phone power supplies, electric vehicles, electric tools and electric toys has achieved rapid development. In the existing manufacturing process of lithium-ion batteries, the liquid injection and formation (that is, the first charging of lithium-ion batteries) processes of lithium-ion batteries are generally operated separately. Firstly, liquid injection is usually performed by sucking back and vacuuming or using a clamp with a sealing ring. Back suction vacuum injection is to put the battery upside down in a closed container with electrolyte at the bottom, and then vacuumize....

Examples

Embodiment approach 1

[0029] The 503048A batteries assembled by laser welding are first vacuum baked, then put into the integrated fixture used in the present invention, and the integrated fixture is closed, so that the negative charging probe of the integrated fixture is in contact with the negative terminal of the battery, The positive electrode charging probe of the integrated fixture is in contact with the battery casing (including the cap) except for the negative terminal, and the sealing rubber ring 8 of the integrated fixture corresponds to the liquid injection hole of the battery, and the sealing rubber ring 8 is tightly pressed The outer ring of the battery liquid injection hole ensures the sealing between the battery liquid injection hole and the electrolyte loading container 3 . Then inject 2.2g of lithium-ion organic electrolyte with a volume ratio of EC:EMC:DMC=1:1:1 and a LiPF6 concentration of 1mol / L into the electrolyte loading container 3 of the integrated fixture, and then the batt...

Embodiment approach 2

[0031] In this embodiment, a charging process of a different duration is performed with a current of a different magnitude from that in the first embodiment, and other operation modes are the same as those in the first embodiment. Evacuate the air pressure in the vacuum formation equipment to -0.10MPa, then put in nitrogen with a purity greater than 99.999%, and keep the vacuum at -0.04 to -0.06MPa, use 0.5 rate current to precharge for 40 minutes, then put in nitrogen, and the formation is completed. Table 1 shows the main properties of the battery manufactured in this embodiment.

[0032] Table 1 The main performance of the batteries made by the two embodiments The main performance of the batteries

[0033]

[0034] The present invention has the following advantages: (1), the method can not only perform vacuum liquid injection on the battery, but also can be connected with constant current charging equipment to charge the battery, and two processes of liquid injection and...

technical field

[0001] The invention relates to a manufacturing and processing method of a lithium-ion battery, and more specifically, to a vacuum formation method of a lithium-ion battery. Background technique

[0002] In recent years, with the emphasis on the non-renewable energy crisis and environmental protection, the application of green and environmentally friendly lithium-ion batteries in mobile phone power supplies, electric vehicles, electric tools and electric toys has achieved rapid development. In the existing manufacturing process of lithium-ion batteries, the liquid injection and formation (that is, the first charging of lithium-ion batteries) processes of lithium-ion batteries are generally operated separately. Firstly, liquid injection is usually performed by sucking back and vacuuming or using a clamp with a sealing ring. Back suction vacuum injection is to put the battery upside down in a closed container with electrolyte at the bottom, and then vacuumize....

Examples

Embodiment approach 1

[0029] The 503048A batteries assembled by laser welding are first vacuum baked, then put into the integrated fixture used in the present invention, and the integrated fixture is closed, so that the negative charging probe of the integrated fixture is in contact with the negative terminal of the battery, The positive electrode charging probe of the integrated fixture is in contact with the battery casing (including the cap) except for the negative terminal, and the sealing rubber ring 8 of the integrated fixture corresponds to the liquid injection hole of the battery, and the sealing rubber ring 8 is tightly pressed The outer ring of the battery liquid injection hole ensures the sealing between the battery liquid injection hole and the electrolyte loading container 3 . Then inject 2.2g of lithium-ion organic electrolyte with a volume ratio of EC:EMC:DMC=1:1:1 and a LiPF6 concentration of 1mol / L into the electrolyte loading container 3 of the integrated fixture, and then the batt...

Embodiment approach 2

[0031] In this embodiment, a charging process of a different duration is performed with a current of a different magnitude from that in the first embodiment, and other operation modes are the same as those in the first embodiment. Evacuate the air pressure in the vacuum formation equipment to -0.10MPa, then put in nitrogen with a purity greater than 99.999%, and keep the vacuum at -0.04 to -0.06MPa, use 0.5 rate current to precharge for 40 minutes, then put in nitrogen, and the formation is completed. Table 1 shows the main properties of the battery manufactured in this embodiment.

[0032] Table 1 The main performance of the batteries made by the two embodiments The main performance of the batteries

[0033]

[0034] The present invention has the following advantages: (1), the method can not only perform vacuum liquid injection on the battery, but also can be connected with constant current charging equipment to charge the battery, and two processes of liquid injection and...

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