Method for connecting cell of soft package lithium battery pack

Abstract

The invention discloses a method for connecting a cell of a soft package lithium battery pack, which comprises the following steps: adopting two plastic-aluminum films to package a lithium cell or forming a battery unit by connecting more than two single batteries in parallel; putting the battery unit into a shell of the battery pack after finishing mutually-independent welding; packaging and compacting the battery unit by using a mounting plate; and using a metal conductive plate and the mounting plate to clamp a sheet metal on a pole lug of the battery unit in a movable connection mode so as to form the soft package lithium battery pack which has complete circuit connection and can be dismounted and mounted repeatedly. After improvement, in the movable connection mode, the soft package lithium battery pack has a simple structure and is convenient and quick to dismount and mount, any one or more cells in the soft package lithium battery pack can be replaced in time, the service life and the use quality of the battery pack are guaranteed, the service performance and the maintenance performance of the soft package lithium battery pack are improved, and the using cost is reduced, thus the soft package lithium battery pack is quite suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to a method for connecting lithium batteries, in particular to a method for connecting cells of a soft-packed lithium battery pack. Background technique [0002] According to the classification of the outer packaging of lithium batteries, lithium batteries can be divided into hard-shell lithium batteries and soft-pack lithium batteries. Hard-shell lithium batteries mainly include steel-shell lithium batteries and plastic-shell lithium batteries. Special-shaped flexible packaging lithium battery. Flexible packaging lithium battery tabs are usually thin metal sheets with good electrical conductivity, such as nickel strips, copper strips, and aluminum strips. When the batteries are connected in parallel or in series, the battery tabs are superimposed on each other and then welded, such as tin welding, laser welding, etc. Welding or ultrasonic welding, after welding, the battery lugs are reliably connected and the structure is stable...

AI Technical Summary

Problems solved by technology

[0003] 1. A large amount of heat is generated during soldering, which can easily cause overheating of the tabs, resulting in battery leakage and damage;

[0004] 2. Laser welding and ultrasonic welding are irreversible welding. After welding, if the battery has a problem and needs to be removed, the battery tab must be destroyed, resulting in direct damage to the good battery.

[0005] 3. After the batteries are used in groups, if there is a difference in the performance of one battery cell or it cannot be used normally, it will directly affect the use of other battery cells in the battery pack. The irreversible connection method will cause the entire battery pack to be scrapped and cause more damage Large losses and waste of resources have seriously affected the mass use of flexible packaging lithium batteries and increased the cost of use

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