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Lithium ion battery liquid injection method adopting polygonal double-hole liquid injection mode

A lithium-ion battery, polygonal technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as bottlenecks in the injection process, achieve stable and fast injection, solve difficult injection and infiltration, and improve injection efficiency. Effect

Pending Publication Date: 2022-03-18
TIANJIN LISHEN BATTERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although existing technologies can more or less improve the efficiency of liquid injection, the liquid injection process is still the bottleneck for the continuity of mass production

Method used

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  • Lithium ion battery liquid injection method adopting polygonal double-hole liquid injection mode
  • Lithium ion battery liquid injection method adopting polygonal double-hole liquid injection mode
  • Lithium ion battery liquid injection method adopting polygonal double-hole liquid injection mode

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Effect test

Embodiment

[0037] (1) See attached figure 1 , 2 , design and process the top cover of the 71173207 model battery, and process a polygonal liquid injection hole on the side of the positive pole. The liquid injection hole is a stepped circular platform through-hole structure in the shape of a concave platform. The bottom hole is an inscribed regular pentagon with a diameter of 7mm; a circular vent hole is processed near the negative pole side. The vent hole includes a large round hole and a small round hole in the shape of a stepped circular platform through-hole structure. The vent hole is large and round. The diameter of the hole is a circle with a diameter of 12mm, and the small hole is a circle with a diameter of 7mm;

[0038] (2) Process the battery to the state before liquid injection according to the conventional process;

[0039] (3) See attached image 3 , 4 , process the liquid inlet sealing head of semicircular sphere, its ball head diameter is 16mm, and the inscribed regula...

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Abstract

The invention relates to a lithium ion battery liquid injection method adopting a polygonal double-hole liquid injection mode, which is characterized in that an exhaust hole and a liquid injection hole are arranged on a battery cover, the exhaust hole is hermetically connected with a vacuumizing device, and the liquid injection hole is hermetically connected with an electrolyte tank to form a vacuum negative-pressure electrolyte injection channel with double communicated holes; the vacuum value is adjusted in the liquid injection process, so that the battery always keeps stable negative pressure. The device has the beneficial effects that the surface tension of electrolyte can be effectively broken through by adopting the polygonal liquid inlet holes, and the problem that the electrolyte is difficult to inject and infiltrate is solved; and the exhaust hole is used as a vacuum hole, so that stable negative pressure in the battery can be always kept in the liquid injection process, and the liquid injection efficiency is remarkably improved. The method is simple in required condition, good in repeatability, wide in application range, high in controllability and simple to operate; according to the method, adjustable vacuum values can be set according to different batteries, so that stable and rapid liquid injection is ensured.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a liquid injection method for a lithium ion battery using a polygonal double-hole liquid injection method. Background technique [0002] In recent years, with the continuous improvement of people's requirements for the duration and cruising range of electrical equipment. Consumer electronics, new energy vehicles, and energy storage systems have gradually increased the requirements for battery energy density. At present, in terms of power batteries, the energy density of lithium iron phosphate batteries is about 160Wh / kg, and the energy density of ternary materials reaches 220-260Wh / kg. However, the corresponding positive electrode active material has not changed greatly, which makes people solve the problem as reducing as much as possible, reducing the thickness of auxiliary materials and increasing the amount of main materials as much as possible. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/618H01M50/627H01M50/30H01M50/636
CPCH01M50/618H01M50/627H01M50/30H01M50/636Y02E60/10
Inventor 陈英龙路荣彬于利伟丁照石
Owner TIANJIN LISHEN BATTERY
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