Internal structure of soft package lithium ion battery and assembly method

Abstract

The invention discloses an internal structure of soft package lithium ion battery, which comprises a housing and a battery equipped in the housing, and EVA is equipped between tabs, and the tab of the battery is provided with a PCB board with through hole, and the tab crosses the PCB board. The invention can guarantee good contact of tab after the electrical core is connected in series connection, and simultaneously guarantee non-falling after welding, and the slit between electrical core tabs can be filled with insulated EVC with high temperature resistance and good formability, and the EVA is a plastic material which is composed of ethene (E) and vinyl acetate (VA). Ultrasonic welding of tab can play the role for reducing internal resistance between insulators and preventing falling caused by unfirm fixing of tab. After welding, scolding tin for tab can play the role for reinforcing soundness of the tab, and simultaneously facilitating link of wire harness. The tab crosses PCB with through hole, thereby reinforcing fixation of tab and increasing anti-compression property of electrical core tab position.

Description

technical field [0001] The invention relates to the technical field of storage battery assembly, in particular to an internal structure and assembly method of a soft-pack lithium-ion battery. Background technique [0002] At present, the assembly of soft-pack lithium-ion batteries uses a simple screw fastening method, and the screw fastening is prone to loosening, resulting in poor contact, which will cause a sudden drop in voltage of the battery pack during use, and seriously cause ignition and burnout Battery. The traditional battery pack structure also has the following disadvantages. 1. The fixing between the tabs of the battery cells is not firm, and it is easy to loosen, making the power supply poor, and there will be a short circuit, causing accidents. 2. The tab part of the traditional structure of the battery cell does not have pressure resistance. After the battery pack is subjected to external force, the tab is easy to loosen, causing poor contact with the power ...

AI Technical Summary

Problems solved by technology

[0002] At present, the assembly of soft-pack lithium-ion batteries uses a simple screw fastening method, and the screw fastening is prone to looseness, resulting in poor contact, which will lead to a sudden drop in the voltage of the battery pack during use, and seriously cause ignition and burnout Battery

The traditional battery pack structure also has the following disadvantages: 1. The fixation between the tabs of the battery cells is not firm, and it is easy to loosen, making the power supply poor, and there will be short circuits, causing accidents

2. The tab part of the traditional structure of the battery cell does not have pressure resistance. After the battery pack is subjected to external force, the tab is easy to loosen, making the power supply poor, and there will be a short circuit, causing an accident

3. The connection between the tab and the wire of the traditional structure is easy to loose during use

And in the cold northern region, because the battery is in a low temperature state, the discharge capacity of the battery pack is extremely small, which seriously affects the operation of the equipment

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