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A Gradient Tab with Nearly Equal Cross-sectional Area

A cross-sectional area, gradual change technology, applied in the direction of structural parts, electrical components, battery pack parts, etc., can solve the problems of low connection strength, slow heat conduction, difficult sealing, etc., to enhance connection reliability, reduce heat storage, reduce The effect of sealing difficulty

Active Publication Date: 2021-02-19
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the shortcomings of the existing tabs in high current applications, a design method of near equal cross-sectional area gradient tabs is provided to solve the application technical problems of traditional tabs such as slow heat conduction, high heat generation, difficult sealing, high impedance and low connection strength.

Method used

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  • A Gradient Tab with Nearly Equal Cross-sectional Area
  • A Gradient Tab with Nearly Equal Cross-sectional Area
  • A Gradient Tab with Nearly Equal Cross-sectional Area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A near-equal cross-sectional area gradient tab suitable for soft-pack power batteries figure 2 As shown, the lug body adopts a nearly equal cross-section gradient method, the sealing area 2 of the lug body has a small thickness, and the lead-in and outlet ends 1 and 3 of the lug body are pole structures, which have strong machinability. Its specific design is as follows:

[0036] The sealing area 2 is covered with ear glue, the lead-in end 1 is cylindrical, with the smallest surface area, and then gradually changes to a near-equal cross-sectional area until the sealing area 2 is flat plate-shaped, with the largest surface area, and then the near-equal cross-sectional area gradually changes to the lead-out end 3 , the shape is symmetrical to that of the lead-in end 1.

[0037] The lug designed with this shape can effectively reduce the thickness of the tab sealing area 2 , thus allowing greater current density under the same sealing thickness. At the same time, the le...

Embodiment 2

[0039] A near-equal-sectional-area gradient tab that is also suitable for soft-pack power batteries image 3 As shown, the lug body adopts a nearly equal cross-section gradual change method, the sealing area 2 of the lug body has a small surface area, and the surface areas at the inlet and outlet ends 1 and 3 are large. Its specific design is as follows:

[0040] The sealing area 2 is covered with tab glue, the leading-in end 1 is a flat plate with the largest surface area, and then gradually changes to a near-equal cross-sectional area until the sealing area 2 is cylindrical, with the smallest surface area, and then gradually changes to a near-equal cross-sectional area to lead-out At the end 3, the shape is symmetrical with that of the introduction end 1.

[0041] The lug designed with this shape can effectively reduce the surface area of ​​the tab sealing area 2, increase the rate of good sealing products, and reduce the leakage rate of the battery cell. In addition, the ...

Embodiment example 3

[0043] A near-equal-sectional-area gradient tab that is also suitable for soft-pack power batteries Figure 4 As shown, the lug body adopts a nearly equal cross-sectional area gradual change method, and the sealing area 2 of the lug body has a small surface area and a curved surface. Its specific design is as follows:

[0044] The sealing area 2 is covered with tab glue, and the lead-in end 1 is in the shape of a flat plate with the largest surface area, and then gradually changes to an equal cross-sectional area until the seal area 2 becomes an ellipse, and then changes to an equal cross-sectional area to lead-out end 3 , and the leading end 3 is symmetrical to the leading end 1.

[0045] The lug with this shape design provides a surface arc structure on the basis of Example 2, which can more effectively increase the sealing yield and reduce the proportion of battery cell leakage.

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Abstract

The invention discloses a near-equal-sectional-area gradual-change tab, which includes a tab body, the tab body includes a sealing area in the middle, and lead-in ends and lead-out ends respectively arranged on both sides of the seal area, the lead-in end There is a gradual change to the middle of the sealing area, and the gradual change from the lead-out end to the middle of the sealing area is also a gradual change of nearly equal cross-sectional area, and the range of gradual change of the near-equal cross-sectional area is controlled within 30%. Through the present invention, the effective cross-sectional area of ​​the tab heat conduction can be increased to improve the thermal conductivity of the tab; the effective conductive cross-sectional area of ​​the tab can be increased to reduce the internal resistance of the tab; the shape of the tab can be changed to reduce the packaging under the condition of nearly equal cross-section Difficulty; the thickness and shape of the outer lead-out end of the tab can be increased, and the mechanical strength and contact area can be enhanced.

Description

technical field [0001] The invention relates to a tab, and more specifically, to a tab with a nearly equal cross-sectional area and a gradually changing tab. Background technique [0002] In recent years, the demand for power battery applications has increased significantly. In order to achieve high-power use of batteries, the width and thickness of tabs have increased significantly. However, the design of the tab has not yet broken through the tradition, and the different requirements for the cross-sectional area of ​​each area of ​​the tab have not been fully considered when adjusting the width or thickness of the tab. [0003] However, the resistance heat generation, heat conduction, voltage drop and mechanical endurance of tabs are all related to the actual contact cross-sectional area. For example, the resistance of tabs Re∝1 / S (S is the effective conductive cross-sectional area), The voltage drop in the circuit is UR∝1 / S, the heat generation of the tab is Q∝1 / S, the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/533H01M50/531
CPCH01M50/531Y02E60/10
Inventor 李铮铮吕忱蒋浩民张丕军
Owner BAOSHAN IRON & STEEL CO LTD
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