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Pole piece, battery cell assembly and battery

A pole piece and component technology, which is applied in the manufacture of batteries, electrolyte batteries, non-aqueous electrolyte batteries, etc., can solve the problem of affecting the electrical performance of pole pieces and batteries, virtual welding or over welding, and affecting the connection between tabs and adapters, etc. question

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 have the problem of virtual welding or over-welding, which affects the connection between the tab and the adapter 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

[0045] This embodiment provides a cell assembly, mainly through the following welding process to weld the lug and the adapter piece:

[0046] Ultrasonic welding equipment is used, the diameter of the welding head is 100mm, the diameter of the welding teeth is 1-2mm, and the power of the welding machine is 40KHz. Under the conditions of welding cylinder pressure of 0.3MPa, ultrasonic amplitude of 100μm, welding head's linear speed of 80m / min, and tape speed of 50m / min, the pole pieces were transferred and welded. Wherein, the pole piece of the battery cell is a pole piece containing a composite current collector, and the resistance of the lug of the single-layer pole piece is 20Ω.

[0047] After welding, the size of the solder mark on the lug is 1mm×1mm, the distance between two adjacent solder marks is 1mm, the number of cracks is 4-6, the length of the crack is 0.8mm-0.9mm, and the width of the crack is 200 μm.

Embodiment 2

[0049] This embodiment provides a cell assembly, mainly through the following welding process to weld the lug and the adapter piece:

[0050] Ultrasonic welding equipment with a welding head diameter of 100mm, a welding tooth diameter of 1-2mm, and a welding power of 40KHz is used. The welding cylinder pressure is 0.3MPa, the ultrasonic amplitude is 100μm, and the linear speed of the welding head is 100m / min. Under the process condition that the belt speed is 50m / min, transfer welding is carried out on the pole piece. Wherein, the pole piece of the battery cell is a pole piece containing a composite current collector, and the resistance of the tab of the single-layer pole piece is 24Ω.

[0051] After welding, the size of the solder mark on the lug is 1mm×1mm, the distance between two adjacent solder marks is 1mm, the number of cracks is 4-6, the length of the crack is 0.9mm-0.95mm, and the width of the crack is 300 μm.

Embodiment 3

[0053] This embodiment provides a cell assembly, mainly through the following welding process to weld the lug and the adapter piece:

[0054] Ultrasonic welding equipment with a welding head diameter of 100mm, a welding tooth diameter of 1-2mm, and a welding power of 40KHz is used. The welding cylinder pressure is 0.3MPa, the ultrasonic amplitude is 100μm, and the linear speed of the welding head is 70m / min. Under the process condition that the belt speed is 50m / min, transfer welding is carried out on the pole piece. Wherein, the pole piece of the battery cell is a pole piece containing a composite current collector, and the resistance of the lug of the single-layer pole piece is 20Ω.

[0055] After welding, the size of the solder mark on the lug is 1mm×1mm, the distance between two adjacent solder marks is 1.5mm, the number of cracks is 1, the length of the crack is 0.7mm-0.75mm, and the width of the crack is 60μm .

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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 marks, cracks are formed between at least two adjacent welding marks, and the number of the cracks with the width not smaller than 20 micrometers is 1-10. The pole lug with the welding mark and crack structures is good in welding effect, and the probability of over-welding and insufficient welding is reduced. The sheet resistance of the structure is relatively small, so that 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 adapters 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 adapter 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 probability of false w...

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