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A method for improving the pre-welding quality of the negative tab of high-power lithium-ion battery

A lithium-ion battery, high-power technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of complex welding of energy-type batteries, large self-discharge of power-type batteries, and many metal shavings, so as to reduce power consumption. The effects of micro-core short circuit, improved yield, and reduced production cost

Active Publication Date: 2021-10-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

[0003] The consistency of the power performance of the high-power power battery is closely related to the welding method and quality of the tabs. The inconsistency of the welding quality seriously affects the power performance of the battery. Compared with energy-type batteries, the welding is more complicated, resulting in more metal shavings in the process, resulting in greater self-discharge of power-type batteries, and the short-circuit rate of batteries is higher than that of energy-type batteries.

Method used

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  • A method for improving the pre-welding quality of the negative tab of high-power lithium-ion battery

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Embodiment

[0014] A method for improving the pre-welding quality of negative electrode tabs of high-power lithium-ion batteries, comprising the following steps: arranging five negative electrode copper tabs with a size of 200mm×8mm×10mm so that one end of the negative electrode copper tabs is on the same plane, Ultrasonic welding machine is used for one-time pre-welding, standing still, and then two-time pre-welding; the welding parameters of the first-time pre-welding and the second-time pre-welding are the same.

[0015] By adjusting the welding energy value, welding down pressure and welding time in the welding process, the welding parameters of Examples 1-7 are shown in Table 1 below:

[0016] Table 1 Embodiment 1-7 Welding parameters

[0017] Welding energy value / J Welding pressure / kPa Welding time / s Example 1 450 551.60 1.5 Example 2 400 551.60 1.5 Example 3 350 551.60 1.5 Example 4 400 482.65 1.5 Example 5 400 413.70 1.5 ...

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Abstract

The invention discloses a method for improving the pre-welding quality of the negative electrode tabs of high-power lithium-ion batteries, which comprises the following steps: arranging a number of negative electrode copper tabs so that one end of the negative electrode copper tabs is on the same plane, and using an ultrasonic welding machine One pre-welding, let it stand, and then carry out the second pre-welding. The method proposed by the present invention to improve the pre-welding quality of the negative electrode tab of the high-power lithium-ion battery, through the way of secondary welding, reduces the energy value and welding pressure required during welding, reduces the generation of metal shavings, and improves the welding firmness , improve the power performance of the battery, reduce the short-circuit rate of the battery cell in the production process, provide technical support for the power consistency improvement and process improvement of the high-power lithium-ion battery, increase the cost of the battery pass-through rate, and reduce the production cost of the enterprise.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for improving the pre-welding quality of the negative electrode lug of a high-power lithium-ion battery. Background technique [0002] Lithium-ion power battery is an important part of electric vehicles, and its performance directly affects the normal use of electric vehicles. Because of its popularization and application, its electrical performance and safety performance have been widely concerned. At present, there are two main technical routes in China: high-power power lithium-ion battery and pure electric high-energy lithium-ion power battery technology. Among them, the pure electric high-energy lithium-ion battery is affected by the gram capacity of the battery raw material, and the energy density is greatly improved to a certain extent. technical difficulty. For high-power lithium-ion batteries, the power performance of the battery is mainly consid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/528H01M50/531H01M50/534H01M10/0525
CPCY02E60/10
Inventor 丁浩王丰颜威威
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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