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Pole piece for lithium ion battery, laminated lithium ion battery and preparation method of laminated lithium ion battery

A lithium-ion battery and pole piece technology, which is applied to non-aqueous electrolyte battery electrodes, secondary batteries, battery pack components, etc. The effect of reducing internal resistance and improving efficiency

Inactive Publication Date: 2012-02-22
SHENZHEN GREPOW BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The manufacturing process of the laminated lithium-ion battery in the prior art is complicated and the labor cost is high;
[0007] 2. The internal resistance of the laminated lithium-ion battery in the prior art is large, and the heat dissipation is slow during the high-rate discharge process. Especially when the continuous high-rate discharge is applied, the temperature of the laminated lithium-ion battery is extremely high, and the inside of the battery will be caused by Uneven heat dissipation causes the battery to swell easily, which is not conducive to continuous discharge of the battery with high current. Especially not suitable for use as a power battery with high current continuous discharge

Method used

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  • Pole piece for lithium ion battery, laminated lithium ion battery and preparation method of laminated lithium ion battery
  • Pole piece for lithium ion battery, laminated lithium ion battery and preparation method of laminated lithium ion battery
  • Pole piece for lithium ion battery, laminated lithium ion battery and preparation method of laminated lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] see image 3 As shown, this embodiment provides a schematic structural diagram of a novel pole piece for a lithium-ion battery.

[0078] see image 3 As shown, the pole piece of this embodiment is generally composed of a current collector foil and an electrode material layer coated on the surface of the current collector foil, and tab welding positions 3011 and 3021 extend and protrude from the foil. The difference between the pole piece of this embodiment and the conventional pole piece in the prior art mainly includes:

[0079] A pole piece of the present embodiment is made up of two sub-pole pieces with the same width: the first sub-pole piece 301 and the second sub-pole piece 302, the two sub-pole pieces 301, 302 are integrally connected, the two sub-pole pieces 301, Between 302 is a crease 303 that runs through the length direction of the pole piece. The sub-pole pieces 301 and 302 on both sides of the crease 303 can be bent along the crease 303 until the two sub...

Embodiment 2

[0125] Figure 8 It is a schematic diagram of the structure of the first pole piece provided in this embodiment.

[0126] Figure 9 for application Figure 8 A schematic diagram of the front structure of a stacked body of a laminated lithium-ion battery made of the positive electrode sheet and the negative electrode sheet of the structure shown.

[0127] see Figure 8 As shown, the first sub-pole piece 801 and the second sub-pole piece 802 on both sides of the crease in the pole piece provided by this embodiment have the same width and the same shape, which is the same as that in Embodiment 1. image 3 The differences in the structures shown mainly lie in that the position settings of the lug welding positions 8011 and 8012 on the two pole pieces are different. In this example:

[0128] The tab welding position 8011 of the first sub-pole piece 801 extends and protrudes on: the edge of the first width end of the pole piece; the tab welding position 8012 of the second sub-p...

Embodiment 3

[0135] see Figure 10 As shown, the difference between the pole piece provided in this embodiment and embodiment 1 is:

[0136] Although the sub-pole pieces 1002 , 1003 on both sides of the crease 1001 have the same width or even the same shape, the distances from the tab welding positions 10021 , 10022 of the two sub-pole pieces 1002 , 1003 to the crease 1001 are different.

[0137] application Figure 10 See Figure 11 shown.

[0138] exist Figure 11 Among them, four rows of tab welding positions are formed along the height direction of the laminated body as a whole: the tab welding positions 1101 and 1102 of the two rows of positive electrode sheets located side by side at one end of the laminated body are located at the other end of the laminated body The tab welding positions 1103 and 1104 of the two rows of positive electrode sheets arranged side by side. Figure 11 The A-A section structure see Figure 5 shown.

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Abstract

The invention relates to the field of lithium ion battery design, and discloses a pole piece for a lithium ion battery, a laminated lithium ion battery and a preparation method of the laminated lithium ion battery. The pole piece consists of a first auxiliary pole piece and a second auxiliary pole piece which can be folded along a crease through the pole piece in the length direction, and the distance from the longitudinal outer edge of the first auxiliary pole piece to the crease is equal to that from the longitudinal edge of the second auxiliary pole piece to the crease. The width ends of the first auxiliary pole piece and the second auxiliary pole piece extend and protrude to form pole lug welding positions, the extending direction of each pole lug welding position is orthogonal with the corresponding width ends, and current collector foils are exposed outside the surface of the pole lug welding positions. Utilizing the technical scheme is beneficial to reducing internal resistance of the laminated lithium ion battery, reduces heat quantity of the battery in continuous high-rate discharging, avoids expansion and improves efficiency of the lamination process.

Description

technical field [0001] The invention relates to the field of lithium-ion battery design, in particular to a pole piece for a lithium-ion battery, a laminated lithium-ion battery and a preparation method. Background technique [0002] With the increasingly scarce energy and the increasingly prominent environmental protection issues, lithium-ion batteries have gradually become the mainstream energy source, and because of their advantages such as light weight, small size, large capacity, and fast charging speed, they are widely used in various Mobile phones, mobile devices. [0003] With the advancement of science and technology, lithium-ion batteries have become the current development trend as the power source of current power equipment (such as automobiles). In terms of application requirements, power lithium-ion batteries need not only high capacity, but also long-lasting high rates. Discharge, and the laminated lithium-ion battery is currently a mainstream power lithium-i...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M2/26H01M10/0585
CPCY02E60/10Y02P70/50
Inventor 胡远升何安轩张继锋方保红
Owner SHENZHEN GREPOW BATTERY CO LTD
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