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Square lithium ion power battery

A power battery and lithium-ion technology, which is applied in the field of square lithium-ion power batteries, can solve problems such as the peeling off of the welding surface and the damage of the tabs of the foil material, and achieve the effects of easy processing and molding, good heat dissipation, and prevention of poor positioning

Active Publication Date: 2011-11-16
JIAN UTILITY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is equipped with a cover plate that meets the needs and the corresponding negative tab welding method to solve the problem of damage to the foil material tab during welding and the welding surface falling off

Method used

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  • Square lithium ion power battery
  • Square lithium ion power battery
  • Square lithium ion power battery

Examples

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Embodiment Construction

[0024] Attached below figure 1 , 2 , 3, 4, 5, 6, 7, 8, 9 to describe preferred embodiments of the present invention.

[0025] A square lithium-ion power battery, comprising a metal case 1, a cover plate assembly 2, a spacer 3, a battery core set composed of a core 4 and an electrolyte filled in the shell, the core 4 includes a positive pole piece 5 , positive pole tab 7-1, diaphragm, negative pole piece 6, negative pole tab 7-2.

[0026] First make the positive / negative electrode sheet, when coating the positive electrode and the negative electrode, reserve the positive and negative electrode tabs at the end of the electrode sheet as required, then reserve a certain width and length of foil as the tab, and cut off the rest. Figure 1 and figure 2 As shown, the protruding direction of the tab is parallel to the long side line of the pole piece. Except for the foil at the welded part of the cover plate 2, the negative electrode tab 7-2 is covered with high-temperature adhesi...

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Abstract

The invention relates to a square lithium ion power battery, which is characterized in that a lug of a mandrel is placed at the outermost layer of the mandrel, the lug extends along the arc side surface of the mandrel and the extending direction of the lug is perpendicular to the arc side surface. An anode lug is threaded through a spacer and welded on a cover plate; a cathode lug is threaded through a spacer and welded on a connecting sheet. The anode / cathode lug and the connecting sheet are folded at the rear of a spacer groove, the spacer is fastened on an insulated rubber pad of the coverplate. The invention also provides a method for welding the cathode lug. The present invention has the advantages that a thin shell with wide and short shape is employed, the heat dissipation of the battery is good and the metal shell is easy to process for forming. The lug is arranged at the outermost layer of the mandrel, which avoids the problem of short circuit generated when the battery falls or the impacted lug and the connecting sheet enter in the mandrel. The method of welding cathode lug is capable of effectively inhibiting the disadvantage of easy rupture force of copper foil cathode lug when being smashed and being pulled by external force; an engagement structure of the spacer and the insulated rubber pad is employed for effectively preventing the poor positioning of the spacer.

Description

technical field [0001] The invention relates to a lithium-ion power battery, in particular to a square lithium-ion power battery with a wide and short shape and a thin thickness. Background technique [0002] At present, the shape of the square lithium-ion power battery is narrow and high. There are two types of positive and negative tabs of the battery: the first type uses hard tabs, and the second type uses foil materials as tabs. The positions of the above two tabs are all placed on the long side of the pole piece. After being rolled into a battery core, the tabs are drawn out from the middle of the core, and the protruding direction of the tabs is parallel to the arc-shaped side of the core; when welding the negative tabs, the tabs are directly welded to the cover plate with welding equipment. Alternatively, the tab is directly welded to the connecting piece on the cover plate, and the negative tab is not clamped; the spacer is not fixed either. [0003] The power batt...

Claims

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Application Information

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IPC IPC(8): H01M2/02H01M2/26H01M2/18H01M2/04H05K7/20
CPCY02E60/12Y02E60/10
Inventor 洪良仕徐丹琼
Owner JIAN UTILITY TECH CO LTD
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