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Production process of nickel tab of lithium ion battery

A lithium-ion battery and production process technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as false welding, false welding, and unstable welding

Active Publication Date: 2017-01-25
DONGGUAN ZHUOYUE NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of electrolyte resistance in the production process of existing nickel tabs, surface treatment is basically carried out on the surface of the nickel strip, that is, a passivation layer resistant to electrolyte is formed on the surface of the nickel strip. The basic substance of the layer is some metal oxides, which makes it difficult to tin the surface of the nickel tab. In this way, when the nickel tab is connected to the circuit board, it is prone to welding instability, false soldering, and false soldering.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: a kind of lithium ion battery nickel tab production process comprises the following steps:

[0019] 1) Preparation of treatment liquid: 1% by weight of soda ash, 10% by weight of caustic soda, 0.5% by weight of sodium stearate and 88.5% by weight of water are mixed to prepare a treatment liquid;

[0020] 2) Depassivation treatment: the tab to be treated is released from the unwinding roller, and the tab to be treated is immersed in a treatment solution at a temperature of 75°C for 30s to remove the passivation layer on the surface of the tab;

[0021] 3) Cleaning: Put the tabs that have passed step 2) into water at a temperature of 60°C, and use ultrasonic treatment for 30s to remove the treatment liquid on the tabs;

[0022] 4) Secondary cleaning: put the tabs that have passed step 3) into water for secondary cleaning for 30 seconds, thoroughly clean the tabs, and wind up.

[0023] After the above steps, the nickel tab becomes easy to be tinned.

Embodiment 2

[0025] 1) Preparation of treatment liquid: 1.5% by weight of soda ash, 12.5% ​​by weight of caustic soda, 0.7% by weight of sodium stearate and 85.3% by weight of water are mixed to prepare a treatment liquid;

[0026] 2) Depassivation treatment: the tab to be treated is released from the unwinding roller, and the tab to be treated is soaked in a treatment solution at a temperature of 80°C for 25s to remove the passivation layer on the surface of the tab;

[0027] 3) Cleaning: Put the tabs that have passed step 2) into water at a temperature of 65°C, and use ultrasonic treatment for 25s to remove the treatment liquid on the tabs;

[0028] 4) Secondary cleaning: Put the tabs that have passed step 3) into water for secondary cleaning for 25 seconds, thoroughly clean the tabs, and wind up.

[0029] After the above steps, the nickel tab becomes easy to be tinned.

Embodiment 3

[0031] 1) Preparation of treatment liquid: 2% by weight of soda ash, 15% by weight of caustic soda, 1% by weight of sodium stearate and 82% by weight of water are mixed to prepare a treatment liquid;

[0032] 2) Depassivation treatment: the tab to be treated is released from the unwinding roller, and the tab to be treated is immersed in the treatment solution prepared in step 1) at a temperature of 85°C for 20 seconds to remove the passivation layer on the surface of the tab ;

[0033] 3) Cleaning: put the tabs that have passed step 2) into water at a temperature of 70°C, and use ultrasonic treatment for 20s to remove the treatment liquid on the tabs;

[0034] 4) Secondary cleaning: put the tabs that have passed step 3) into water for secondary cleaning for 20 seconds, thoroughly clean the tabs, and wind up.

[0035] After the above steps, the nickel tab becomes easy to be tinned.

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PUM

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Abstract

The invention provides a production process of a nickel tab of a lithium ion battery. The process comprises the following steps of (1) processing solution preparation: mixing 1 to 2 weight percent of sodium carbonate, 10 to 15 weight percent of caustic soda, 0.5 to 1 weight percent of sodium stearate and 82 to 88.5 weight percent of water to prepare a processing solution, wherein the sum of the weight percentage of all ingredients of the processing solution is 100 percent; (2) passivation relieving treatment: putting a tab to be treated into the processing solution with a certain temperature to be soaked for a certain time to remove a passivation layer on the surface of the tab; (3) cleaning: putting the tab treated in the second step in water with the certain temperature; using ultrasonic waves for processing for a certain time to remove the processing solution on the tab. The tin can be easily soldered on the surface of the nickel tab on the premise of not influencing the performance of the tab glue, so that undesirable phenomena such as soldering instability, false soldering, insufficient soldering and the like cannot easily occur when the nickel tab is connected with a circuit board.

Description

technical field [0001] The invention relates to the technical field of tab production, in particular to a production process for nickel tabs of lithium-ion batteries. Background technique [0002] A lithium-ion battery usually consists of a positive electrode, a negative electrode, a separator, an electrolyte, tabs, and an outer casing. Among them, the tab is the current lead-out terminal of the electrode, the positive tab is an aluminum strip, and the negative tab is a nickel strip. Since the battery cell is an electrolyte environment with various solvents, various salts and hydrofluoric acid, objects exposed to the electrolyte must be resistant to the electrolyte, especially the tabs. In this regard, passivation treatment is mainly used at present, that is, passivation treatment is carried out on the tab metal to form a passivation layer resistant to electrolyte on its surface. [0003] In the process of lithium-ion battery production, after the cells are made, the nicke...

Claims

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Application Information

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IPC IPC(8): H01M2/26C23G1/20H01M50/531
CPCC23G1/20H01M50/531Y02E60/10
Inventor 刘成志张武林王晓明
Owner DONGGUAN ZHUOYUE NEW MATERIAL TECH CO LTD
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