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Pole piece, battery cell assembly and battery

A component and pole piece technology, which is applied in the field of battery components, batteries, and pole pieces, can solve problems that affect the electrical performance of pole pieces and batteries, virtual welding or over-welding, and affect the connection between tabs and connecting pieces.

Active Publication Date: 2021-07-09
XIAMEN HAICHEN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the welding process, it is easy to produce the problem of virtual welding or over-welding, which affects the connection between the tab and the connecting piece, and affects the electrical properties of the pole piece and the battery core

Method used

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  • Pole piece, battery cell assembly and battery
  • Pole piece, battery cell assembly and battery
  • Pole piece, battery cell assembly and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment provides a cell assembly, and adopts the following process to perform transfer welding on the tabs:

[0052] The thickness of the composite current collector is 13 μm, wherein the polymer layer (base film) is 12 μm, the conductive layer is 1 μm, and the thickness of the aluminum foil of the connecting sheet is 13 μm. The thickness of the tab assembly is 40 μm.

[0053] The preset parameters of ultrasonic welding are: the diameter of the welding head is 100mm, the power of the welding machine is 40KHz, the pressure of the welding cylinder is 0.3MPa, the amplitude of the ultrasonic wave is 16μm, and the linear speed of the welding head is 50m / min.

[0054] The thickness of the tab assembly corresponding to the welding position is 20 μm, the thickness of the tab assembly corresponding to the extrusion zone is 60 μm, and the thickness of the unwelded tab assembly is 40 μm.

[0055] The thickness of the transfer layer corresponding to the welding position is...

Embodiment 2

[0060] This embodiment provides a cell assembly, and adopts the following process to perform transfer welding on the tabs:

[0061] The thickness of the composite current collector is 13 μm, wherein the polymer layer (base film) is 12 μm, the conductive layer is 1 μm, and the thickness of the aluminum foil of the connecting sheet is 13 μm. The thickness of the tab assembly is 40 μm.

[0062] The preset parameters of ultrasonic welding are: the diameter of the welding head is 100mm, the power of the welding machine is 40KHz, the pressure is 0.4MPa, the amplitude is 16μm, and the speed is 50m / min.

[0063] The thickness of the tab assembly corresponding to the welding position is 15 μm, the thickness of the tab assembly corresponding to the extrusion zone is 65 μm, and the thickness of the unwelded tab assembly is 40 μm.

[0064] The thickness of the transition layer corresponding to the welding position is 9 μm, and the thickness of the transition layer corresponding to the ex...

Embodiment 3

[0069] This embodiment provides a cell assembly, and adopts the following process to perform transfer welding on the tabs:

[0070] The thickness of the composite current collector is 13 μm, wherein the polymer layer (base film) is 12 μm, the conductive layer is 1 μm, and the thickness of the aluminum foil of the connecting sheet is 13 μm. The thickness of the tab assembly is 40 μm.

[0071] The preset parameters of ultrasonic welding are: the diameter of the welding head is 100mm, the power of the welding machine is 40KHz, the pressure is 0.2MPa, the amplitude is 16μm, and the speed is 50m / min.

[0072] The thickness of the tab assembly corresponding to the welding position is 35 μm, the thickness of the tab assembly corresponding to the extrusion zone is 45 μm, and the thickness of the unwelded tab assembly is 40 μm.

[0073] The thickness of the transition layer corresponding to the welding position is 14 μm, and the thickness of the transition layer corresponding to the ext...

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Abstract

The invention provides a pole piece, a battery cell assembly and a battery, and relates to the technical field of lithium batteries. According to the pole piece, a pole lug of the pole piece is provided with a welding area, the welding area comprises a plurality of welding positions, and the ratio of the thickness of the pole lug at a welding position to the thickness of a part, which is not welded, of the pole lug is (2-12): (3-30). The pole plug is relatively good in welding effect, the conditions of over-welding and insufficient welding are avoided, the resistance of the pole plug is relatively small, and the battery cell has relatively high battery cell capacity and relatively long cycle life.

Description

technical field [0001] The present application relates to the technical field of lithium batteries, in particular, to pole pieces, cell assemblies and batteries. Background technique [0002] With the development of science and technology, there are more and more applications of lithium-ion batteries in fields such as electric vehicles, and the quality and performance of lithium-ion batteries have also received more and more attention. In lithium batteries, the tabs and the connecting pieces are mostly connected by welding. Generally, ultrasonic welding or laser welding is used. During the welding process, it is easy to produce the problem of virtual welding or over-welding, which affects the connection between the tab and the connecting piece, and affects the electrical properties of the pole piece and the battery core. Contents of the invention [0003] The purpose of this application is to provide a pole piece, a cell assembly and a battery, so as to reduce the probab...

Claims

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Application Information

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IPC IPC(8): H01M50/528H01M50/531H01M10/058H01M10/0525
CPCH01M10/058H01M10/0525H01M2220/20Y02P70/50Y02E60/10
Inventor 李晓杰郭敏
Owner XIAMEN HAICHEN NEW ENERGY TECH CO LTD