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Liquid injection process of end face welding cylindrical lithium ion battery

A lithium-ion battery, cylindrical technology, applied in the direction of cylindrical shell battery/battery, secondary battery, battery pack parts, etc., can solve the problem of reducing the efficiency of liquid injection, the uniformity of liquid injection, and the difficulty of electrolyte penetration into the core, etc. Problems, to achieve the effect of improving the qualified rate, accelerating the infiltration and absorption, and improving the consistency

Inactive Publication Date: 2020-12-04
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this type of battery is injected using the conventional liquid injection process, the dense and small gap end surface structure makes it more difficult for the electrolyte to penetrate into the core, reducing the efficiency and uniformity of the liquid injection

Method used

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  • Liquid injection process of end face welding cylindrical lithium ion battery
  • Liquid injection process of end face welding cylindrical lithium ion battery
  • Liquid injection process of end face welding cylindrical lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0043] Embodiment: the end face welding cylindrical lithium ion battery (model is IFR32135-15Ah) adopted in this embodiment, the end face structure schematic diagram of the end face welding cylindrical lithium ion battery in this embodiment is as follows figure 2 As shown in , it has a dense end face 10, for the specific liquid injection process, please refer to figure 1 ,Proceed as follows:

[0044] 1) Loading: Transport the baked end-face welded cylindrical lithium-ion battery to the primary liquid injection loading area;

[0045] 2) Short-circuit test: Use a pulse short-circuit tester to conduct short-circuit detection on the battery in the feeding area. The test parameters are voltage 300V, time 0.2s, Vd1: 10%, Vd2: 20%. scrapping;

[0046] 3) One-time isobaric liquid injection: Scan the code and weigh the batteries that pass the short-circuit detection (record the weight in m1). After a certain amount of electrolyte is injected into the battery liquid injection cup, i...

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Abstract

The invention provides a liquid injection process of an end face welding cylindrical lithium ion battery, which comprises the following steps of battery feeding, short circuit detection, primary liquid injection, high-temperature standing, opening pre-formation, high-temperature aging, secondary liquid injection and sealing. The primary liquid injection adopts a vacuum and pressurization alternating mode to circularly carry out primary liquid injection; variable liquid injection is adopted for secondary liquid injection, the problem that electrolyte of the end face welding cylindrical lithiumion battery is difficult to permeate into the roll core can be effectively solved through the liquid injection process, and meanwhile the liquid injection percent of pass and the liquid injection consistency are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a liquid injection process for end-face welding cylindrical lithium-ion batteries. Background technique [0002] With the development of technology, lithium-ion batteries with high energy density are used more and more widely. Lithium-ion batteries can be designed in different shapes according to different working environments, such as square, cylindrical, etc. Among all battery structures, the battery volume of the cylindrical structure is the smallest, and the corresponding volumetric energy density is the largest, and Cylindrical lithium-ion batteries also have the advantages of fast heat dissipation and uniform pressure in all directions, so cylindrical lithium-ion batteries are also the most widely used. [0003] Liquid injection is a key process in the manufacture of cylindrical lithium-ion batteries. The amount of electrolyte has an important imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/36H01M10/04H01M10/0525H01M10/058
CPCH01M10/0422H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 王倩张磊杨庆锁袁超
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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