Lithium battery

A lithium battery and battery technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as affecting the connection firmness of the pole and the tab, affecting the sealing between the pole and the cover, and limited contact length. , to prevent radial movement, increase contact length, and enhance sealing effect

Inactive Publication Date: 2010-06-23
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the battery cover is relatively thin, the contact length between the pole and the battery cover in the axial direction is limited, and the radial support obtained is limited, because the pole is relatively easy to shake in the radial direction, and the radial shake of t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045] Example one

[0046] Such as figure 1 As shown, the lithium battery 10 includes a battery cover assembly 300, a pole 100, a battery casing 400, and a battery winding core 500. The pole 100 passes through the battery cover assembly 300 and is connected to the battery winding core 500 sealed in the battery housing 400 by the battery cover assembly 300.

[0047] The battery cover assembly 300 includes a battery cover 360, an insulating member 370 and an insulating spacer 380. The battery cover plate 360 ​​is welded to the top of the battery case 400. The insulating spacer 380 is arranged between the battery cover 360 and the battery core 500, and the size of the outer wall thereof is consistent with the size of the inner wall of the battery casing 400. The tabs (not shown) on the battery core 500 pass through the insulating spacer 380 and are connected to the pole 100.

[0048] The battery cover 360 and the top end of the battery housing 400 are generally connected by welding....

Example Embodiment

[0057] Example two

[0058] On the basis of Example 1, such as Image 6 As shown, the pole hole 364 may be a cone with a small upper opening and a large lower opening (such as a cone or a regular polygonal pyramid), and the corresponding part of the pole 100 has a corresponding cone (such as a cone or a regular polygonal pyramid). When the fastening nut 320 is tightened, the pole 100 will move up. Since the opening at the upper end of the pole hole 364 is small, the gap between the tapered part of the pole 100 and the pole hole 364 will be reduced when the pole hole 364 moves up, which can strengthen seal.

Example Embodiment

[0059] Example three

[0060] When the fastening nut 320 presses the battery cover plate 360, or hits the pole 100 during transportation, the boss 362 will receive pressure from the pole 100 and the fastening nut 320. In order to increase the force of the boss 362, the following improvements can be made on the basis of the foregoing embodiment:

[0061] The outer surface of the boss 362 is an arc-shaped ball table-like protrusion. The so-called ball table refers to the part where the sphere is cut by two parallel planes and sandwiched between the two planes. That is Figure 5 As shown, from the battery cover 360 to the top of the boss 362, the radial dimension of the boss 362 decreases in an arc shape. In this structure, on the one hand, the thickness of the joint between the boss 362 and the battery cover 360 is increased, which can withstand greater pressure. On the other hand, the arc structure can reduce stress concentration after compression and avoid cracks.

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PUM

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Abstract

The invention discloses a lithium battery. The lithium battery is mainly characterized in that the lithium battery adopts a battery cover plate and an insulating piece, and the middle part of the battery cover plate is raised to form a lug boss. The battery cover plate which adopts the above structure can strengthen the axial supporting for a pole column, so as to prevent the sealing effect of the battery from being affected due to that the pole column moves in the radial direction to cause a clearance between the battery cover plate and the pole column. As the insulating piece in the form of the lug boss is adopted and the function of a sealant is matched, the sealing effect between the pole column and the battery cover plate can be ensured no matter clearance fit or interference fit is carried out between the pole column and the insulating piece.

Description

【Technical field】 [0001] The invention relates to a battery structure, in particular to a lithium battery structure. 【Background technique】 [0002] Sealing is very important for lithium batteries. The sealing of lithium batteries mainly depends on the sealing between the battery cover and the battery case, and between the battery cover and the pole. The former generally adopts the welding method, which is easier to solve the sealing problem. The latter generally sets up an insulating member between the battery cover plate and the pole. [0003] In existing lithium batteries, the battery cover is generally a flat plate, and the poles pass through the battery cover and enter the interior of the battery. Because the battery cover is relatively thin, the contact length between the pole and the battery cover in the axial direction is limited, and the radial support obtained is limited, because the pole is relatively easy to shake in the radial direction, and the radial shake ...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M2/04H01M2/06H01M50/147H01M50/186
CPCY02E60/12Y02E60/10
Inventor 刘道坦
Owner ZHENGZHOU BAK BATTERY CO LTD
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