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Pole piece for laminated lithium ion battery and laminated lithium ion battery

A lithium-ion battery and lamination technology, which is applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of unfavorable continuous discharge of large current, uneven heat dissipation, and easy inflation of the battery, so as to improve heat generation, Effect of increasing area and reducing internal resistance

Active Publication Date: 2012-01-25
深圳市能锐创新科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The heat dissipation is slow during the high rate discharge process, especially when the battery temperature is extremely high during continuous high rate discharge applications, the battery will easily swell due to uneven heat dissipation inside the battery, which is not conducive to the continuous discharge of the battery with high current. It is especially not suitable for soft-packaged lithium-ion power batteries that are continuously discharged at high currents

Method used

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  • Pole piece for laminated lithium ion battery and laminated lithium ion battery
  • Pole piece for laminated lithium ion battery and laminated lithium ion battery
  • Pole piece for laminated lithium ion battery and laminated lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] image 3 A schematic diagram of the front view structure of a pole piece for a laminated lithium-ion battery provided in this embodiment;

[0066] Figure 4 for image 3 Schematic diagram of the A-A cross-sectional structure.

[0067] see image 3 , 4 As shown, a pole piece for a laminated lithium-ion battery provided in this embodiment is composed of a current collector foil and an electrode material layer 402 coated on the surface of the current collector foil 401 . Its specific structure is as follows:

[0068] On the first width end side of the current collector foil 401 , along a direction perpendicular to the first width end side, a first tab welding position 301 extends and protrudes.

[0069] On the second width end side opposite to the first width end side, a second tab welding position 302 extends and protrudes along a direction perpendicular to the second width end side.

[0070] On the pole piece, the positions of the first tab welding position 301 an...

Embodiment 2

[0089] The present inventor finds in the research process of carrying out the present invention, in order to further improve the performance of laminated lithium-ion battery, can also be to image 3 , 4 The pole piece shown has the following further improvements:

[0090] Figure 6 A schematic diagram of another improved pole piece structure provided in this embodiment.

[0091] see Figure 6 As shown, in this embodiment, further for each pole piece (positive pole piece and / or negative pole piece), the tab on the current collector foil of the pole piece, which is closest to the outer end of the width end side of the pole piece The corners of the outer edges of the welding positions 6041 and 6042 are both configured as arc transitions 601, and each arc transition 601 is tangent to the width end side 602 and the longitudinal end side 603 of the current collector foil.

[0092] Wherein, since the lug welding positions 6041, 6042 of the pole piece extend and protrude along the...

Embodiment 3

[0120] Figure 8 A schematic structural diagram of a pole piece for a laminated lithium-ion battery provided in this embodiment.

[0121] Figure 9 For this example use Figure 8 A schematic diagram of the lamination structure of a laminated lithium-ion battery made of the positive electrode sheet and the negative electrode sheet of the structure shown.

[0122] see Figure 8 , 9 As shown, the difference between this embodiment and embodiment 1 is mainly as follows:

[0123] In this embodiment, the positions of the welding positions of the two tabs on the ends of the two opposite widths on the pole piece have changed:

[0124] In this embodiment, two pole lug welding positions are extended and protruded on the current collector foil of the pole piece:

[0125] Wherein the first tab welding position 8011 extends and protrudes: on the left side of the end edge of the first width of the current collector foil,

[0126] The second tab welding position 8012 also extends and ...

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Abstract

The invention relates to the field of the design of a lithium ion battery, and discloses a pole piece for a laminated lithium ion battery and the laminated lithium ion battery. The pole piece consists of a current collector foil and an electrode material layer coated on the surface of the current collector foil, wherein at least one plug welding position extends and protrudes out of each of two opposite width end edges of the current collector foil; the extending direction of each plug welding position and each width end edge are orthogonal to the surface of each plug welding position; and the current collector foil is exposed outside. By applying the scheme, the internal resistance of the lithium ion battery is greatly reduced, and the pole piece is particularly suitable for lasting high rate discharge application.

Description

technical field [0001] The invention relates to the field of lithium-ion battery design, in particular to a pole piece for a laminated lithium-ion battery and a laminated lithium-ion battery. Background technique [0002] With the increasing shortage of 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 industries. mobile phones and 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 lit...

Claims

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Application Information

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IPC IPC(8): H01M2/26H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 胡远升何安轩张继锋张艳萍
Owner 深圳市能锐创新科技有限公司
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