Special PPS plastic capable of being used for conductive column in lithium battery cover plate assembly

Abstract

The invention discloses a special PPS plastic capable of being used for a conductive column in a lithium battery cover plate assembly, which is prepared from the following raw materials in parts by mass: 80-90 parts of PPS resin, 5-20 parts of a conductive agent and 0.5 part of an antioxidant. The conductive agent is a carbon nanotube grafted carbon fibers, The carbon nanotube grafted carbon fibers are prepared by a click chemistry method, and the grafting rate is 10%. The MFR of the PPS resin under the condition of 310 DEG C/5Kg is 600-700 g/10min. The invention discloses special PPS plastic capable of being used for a conductive column in a lithium battery cover plate assembly. A main body of the special PPS plastic is PPS resin, a novel conductive agent, namely root-hair-shaped carbon nanotube grafted carbon fibers, is introduced, the conductivity of the composite material is uniform and constant, after the special PPS plastic is made into a conductive part, the resistance distribution is narrow, and the resistance floating is small along with the change of voltage and temperature.

Description

technical field [0001] The invention relates to the technical field of special plastics, in particular to a PPS special plastic that can be used for a conductive column in a lithium battery cover assembly. Background technique [0002] Lithium batteries are widely used in various industries, such as 3C electronics, new energy vehicles, etc. However, due to their own characteristics, lithium batteries have great safety problems, such as fire and explosion. Especially in the field of electric vehicles, batteries, as a key component of power output, are related to the safety of vehicles and the safety of personnel. As the core component of the battery assembly, the power battery cover plate has a great influence on the normal use of the car. [0003] Generally, the cover plate of a lithium-ion power battery is composed of a cover body, an insulating sheet, a conductive column, etc., and is mostly sealed by riveting or a spring structure. When metal is used as the material of t...

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Problems solved by technology

[0003] Generally, the cover plate of a lithium-ion power battery is composed of a cover body, an insulating sheet, a conductive column, etc., and is mostly sealed by riveting or a spring structure. When metal is used as the material of the conductive column, the battery contains strong corrosive liquids such as electrolyte , the conductive column is very prone to corrosion, aging, deformation and other problems, resulting in battery leakage and causing safety problems

The cover plate assembly of the existing power battery mostly adopts brazing process, and there is a problem of excessive welding residual stress, which leads to problems in the reliability of the power battery

[0004] In recent years, conductive PPS has appeared on the market as the positive electrode conductive column of the lithium battery cover plate, but the conductive PPS with carbon fiber as the conductive agent has a large resistance fluctuation, and as the voltage increases, the resistance decreases, and at the same time it is affected by the temperature. Greater impact

In this way, when the battery is charging and discharging, the current is likely to be unstable, and with the influence of the external temperature and the self-heating of the battery, the current is also unstable, which affects the use of the product.

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