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Secondary lithium ion battery with installation module, and pile of secondary lithium ion battery

A technology for lithium-ion battery packs and lithium-ion batteries, which is applied to secondary batteries, battery pack components, circuits, etc., can solve problems such as explosion, temperature rise, and pole piece expansion/shrinkage, so as to reduce manufacturing costs and ensure Dynamic stability, the effect of ensuring safety

Inactive Publication Date: 2007-05-09
董家琼
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to its structure, the pole piece of the square large-capacity secondary lithium-ion battery will expand / shrink during the charging / discharging process. The tight contact between the separator and the separator ensures the effective and directional movement of lithium ions, but the current battery casing cannot achieve this function
On the other hand, when the internal short circuit / overcharge of the battery occurs, the internal pressure of the battery will increase. If the gas cannot be discharged in time, the temperature will also rise. If it encounters oxygen, it will cause safety accidents such as combustion and explosion.

Method used

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  • Secondary lithium ion battery with installation module, and pile of secondary lithium ion battery
  • Secondary lithium ion battery with installation module, and pile of secondary lithium ion battery
  • Secondary lithium ion battery with installation module, and pile of secondary lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] With reference to Fig. 2, make an elastic plate 8, this elastic plate 8 adopts a stainless steel plate with a thickness of 1mm to make a corrugated elastic plate 8 with a peak height of 5mm and a distance between two peaks of 10mm.

[0025] Referring to Figure 3, fabricate a secondary Li-ion battery with mounting components. The battery of this embodiment has a positive electrode sheet 2, a negative electrode sheet 3, a diaphragm 4, an electrolyte and a sealed casing 1, and it has the same structure as a conventional secondary lithium ion battery. The corrugated elastic plate 8 produced in this embodiment is installed between the inner wall of the battery case 1 and the positive electrode sheet 3 to form a secondary lithium ion battery with an installation assembly of the present invention.

Embodiment 2

[0027] With reference to Fig. 1, present embodiment makes a vent valve, and this vent valve adopts a steel cylinder 5, and its steel cylinder 5 inner diameter is 3mm, and outer diameter is 4mm; Its side wall has aperture and is the hole 7 of 2mm ; And the casing 6 of a fluorine rubber material is put on the cylinder 5 and forms (as the valve core of a bicycle); Wherein the inner diameter of the sleeve pipe is 2mm, and the outer diameter is 5mm.

[0028] Referring to FIG. 4 , a common secondary lithium-ion battery case 1 is used, and its structure is the same as that of a common secondary lithium-ion battery. The battery size: 110×70×20mm, and the pole piece group size: 80×66×16mm. The vent valve made in this embodiment is installed on the battery case 1 , and the vent valve is sealed and mounted on the top of the secondary lithium ion battery case 1 . The corrugated stainless steel elastic plate 8 made in Example 1 is installed between the inner wall of the battery casing 1 an...

Embodiment 3

[0030] Its structure is the same as that of a common secondary lithium-ion battery with a pole piece group. The elastic plate 8 used is a plate made of elastic metal material with a length of 60×width 50×thickness 8mm. The two sides of the metal plate are There are concavo-convex patterns, and the elastic plate 8 is installed between the inner wall of the battery case 1 and the pole piece group (comprising a combination of stacked positive / negative pole pieces and separators, for example 18 pieces), as shown in FIG. 4 . Among them, battery size: 110×70×20mm; electrode group size: 80×66×16mm.

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Abstract

The battery / battery pack includes positive plate, negative plate, diaphragm, electrolyte, and sealed outer housing. Characters are that the battery / battery pack also includes a safety subassembly. The safety subassembly is an elastic plate installed between inner wall of outer housing and pole piece group piled from positive plate, diaphragm, and negative plate; or the elastic plate is installed between battery and inner wall of outer housing of battery pack. The elastic plate adds elastic force to pole plates all the time in charging and discharging procedure, and keeps dynamic close fitting between pole plates and diaphragm. Thus, the invention guarantees dynamic stability of internal resistance of battery as well as directional movement of lithium ion. An air release valve is installed on the outer housing. When inner gas pressure becomes larger, gas inside battery / battery pack can be released, but outer gas is unable to enter inside the outer housing so as to guarantee safety.

Description

technical field [0001] The invention relates to a decompression and safety mechanism in a lithium ion battery, in particular to a secondary lithium ion battery and a secondary lithium ion battery pack with mounting components. Background technique [0002] At present, the large-capacity secondary lithium-ion battery is composed of positive / negative electrode sheets, diaphragm, electrolyte, sealed casing, and safety valve. The positive electrode sheet is composed of positive electrode active materials: LiMn2O4, LiFePO4, etc. The negative electrode sheet is composed of negative electrode active materials: graphite, Composed of MCMB, etc., the electrochemical properties of the active material determine that the positive / negative active material will expand / shrink during charging / discharging, so the thickness of the electrode sheet changes during charging / discharging. [0003] Due to its structure, the pole piece of the square large-capacity secondary lithium-ion battery will ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/00H01M2/12H01M10/40H01M10/0525H01M50/00H01M50/317
CPCY02E60/122Y02E60/10
Inventor 董家琼
Owner 董家琼
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