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Lithium ion electrical core and lug

A lithium-ion battery, lithium-ion technology, applied in the direction of circuits, electrical components, secondary batteries, etc., can solve the problems of high welding temperature, electrolyte vaporization, high internal resistance, etc., to reduce impedance, reduce heating temperature, increase welding area effect

Inactive Publication Date: 2012-01-04
SHENZHEN GREPOW BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The internal resistance of the welding part of the tab 100 and the pole piece in the existing battery is relatively high, resulting in a particularly high temperature at the welding part, especially during the high-rate discharge process of the battery, the temperature of the welding part of the tab can even be as high as 85 For lithium-ion batteries, if the temperature of this part is too high, it will easily cause the electrolyte in the telecommunications to vaporize, resulting in gas swelling inside the aluminum-plastic packaging film of the lithium-ion battery.

Method used

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  • Lithium ion electrical core and lug
  • Lithium ion electrical core and lug
  • Lithium ion electrical core and lug

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] figure 2 A schematic diagram of the appearance structure of a tab 200 for a lithium ion battery provided in this embodiment. When referring to the figure, the tab 200 includes a metal strip and tab glue 203 pasted on the front and back of the metal strip, and tabs on both sides The positions of the glue 203 are facing and overlapping, and the structure of the tab 200 in this embodiment is different from the prior art mainly including:

[0050] In this embodiment, the longitudinal direction of the metal strip 202 in the tab 200 ( figure 2 One end of the end of X-axis direction) is provided with a protruding portion 201 protruding along the transverse direction of the metal strip 202, so that the width of the entire metal strip 202 at the protruding portion 201 at the two ends of the metal strip 202 is greater than that of the metal strip The width W2 of the middle part of 202 . For example: the metal belt 202 is as a whole figure 2 The "T" shape structure shown in ...

Embodiment 2

[0062] Figure 5 For the schematic diagram of another tab shape structure provided in this embodiment, see Figure 5 As shown, the tab 500 of this embodiment includes a metal strip 504 and overlapping tab glue 503 pasted on the front and back of the metal strip. The differences between the tab 500 of this embodiment and the prior art include the following:

[0063] Both ends of the metal strip 503 in this embodiment are provided with protrusions 501 , 502 as shown in Embodiment 1. see Figure 5 As shown, the two ends of the metal strip 503 respectively have a "T" self-shaped protrusion 501, 502, so that the metal strip 503 is in the shape of an "I" as a whole.

[0064] In the figure of this embodiment, the embodiment is described by taking the tab of the metal strip 504 in the shape of "I" as an example, but it is not limited thereto. For example: as described in Embodiment 1, the protrusions 501, 502 at both ends of the metal strip 504 are in the shape of a "T" at one end ...

Embodiment 3

[0073] Figure 6 A schematic structural diagram of a lithium-ion battery cell provided for this implementation. The lithium ion battery cell provided in this embodiment adopts the tab 200 with the structure of Embodiment 1.

[0074] see Figure 6 As shown, the lithium-ion cell mainly includes a positive electrode sheet, a negative electrode sheet, a diaphragm, an electrolyte, a positive electrode tab 601 , a negative electrode tab 602 , and an aluminum-plastic packaging film 603 . Its specific structure is:

[0075] The diaphragm is spaced between each positive electrode piece and the negative electrode piece, and the positive pole tab 601 and the negative pole tab 602 are respectively welded to the tab welding part reserved on the positive pole piece and the negative pole piece, on the front side of the middle part of the metal strip of the positive pole tab 601 and the negative pole tab 602 And the opposite side is all pasted with lug glue 605 (insulating material of nylo...

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Abstract

The invention relates to the field of lithium ion batteries, and discloses a lithium ion electrical core and a lug. The lug comprises a metal band and lug glue, wherein the lug glue is bonded in the middle positions of the front surface and the back surface of the metal band; a protrusion part is arranged at one tail end of the metal band along the longitudinal direction; the protrusion part protrudes along the horizontal direction of the metal band; and the width of the protrusion part along the horizontal direction of the metal band is greater than that of the middle part of the metal band. The impedance at the welding part of the lug and a pole piece can be reduced by applying the lug in the lithium ion battery, the heat productivity at the welding part of the lug and the pole piece is reduced, and the bulge phenomenon of the lithium ion battery is avoided.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery cell and tabs. Background technique [0002] The soft-packed lithium-ion battery is mainly composed of pole pieces, diaphragms, tabs, and aluminum-plastic packaging films. The diaphragm is spaced between each positive pole piece and negative pole piece, and the pole pieces are welded on the pole pieces to serve as the lithium-ion battery core. The external current-collecting conductor outputs the current externally, and the front and back sides of the metal strip of the tab are overlapped and pasted with insulating tab glue, and the aluminum-plastic packaging film is wrapped on the outer surface of the cell body composed of the pole piece and the diaphragm. During packaging, the inner layer of CPP glue on the outer surface of the aluminum-plastic packaging film (and the tab glue on the tab are fused together by heat, so as to realize the sealed packaging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/26H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 何安轩胡远升张继锋杜华武方保红
Owner SHENZHEN GREPOW BATTERY CO LTD
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