Battery cell tab connecting structure, soft package battery, electric equipment, electric vehicle and power station

Abstract

The invention discloses a battery cell tab connecting structure which comprises tabs and busbars. Through holes matching the tabs are formed in the busbars; the through holes correspond to the tabs; one end of each tab is connected with a battery cell, and the other end of the tab is inserted into the corresponding through hole in a busbar; the tabs and the busbars are connected through laser welding at the through holes. The invention further provides a soft package battery which comprises the battery cell tab connection structure, electric equipment, an electric vehicle and a power station. According to the battery cell tab connecting structure, the soft package battery, the electric equipment, the electric vehicle and the power station, which are provided by the invention, the busbarover-current area is not occupied; the busbars and the tabs are firmly welded; pseudo soldering can be avoided; and the welding quality is convenient to detect.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a battery tab connection structure, a pouch battery, electrical equipment, an electric vehicle and a power station. Background technique [0002] Lithium-ion batteries have the advantages of large battery capacity and small size. Lithium-ion batteries often include several pouch battery modules, and pouch batteries are formed by connecting multiple cells in series and parallel through tabs. Or laser welding method to connect, using bolt connection is easy to cause short circuit, and requires a large number of bolts, which greatly increases the weight of the pouch battery; using ultrasonic welding connection, it is necessary to reserve a large amount on both sides of the tab to be welded The space for the clamping part to clamp the tab, and it is not convenient for multiple tabs to be connected at the same place. The most commonly used method is laser welding. [0003] Such as figure ...

AI Technical Summary

Problems solved by technology

The main problems of existing laser welding are: 1. There is a gap between the tab and the through hole of the bus bar, which reduces the effective flow area of ​​the bus bar; 2. After the tab is bent, it is pressed on the top of the bus bar. Since the tab is made of metal, the metal has elasticity after bending, and the tab has a tendency to rebound. After the tab is bent, there is a gap between the side facing the bus bar and the bus bar. During laser welding, there may be a gap between the tab and the bus Insufficient bonding of the row leads to false welding, and the tab and the bus bar are easily separated after welding; 3. The laser irradiates the tab from the top of the bent tab to the bottom of the tab, so that the tab is welded to the bus bar below. The welding seam between the tab and the bus bar is on the surface of the tab facing the bus bar. The weld seam is blocked by the tab, and the welding quality cannot be detected by common appearance inspection methods after welding.

Images