Power battery top cover and power battery

Abstract

The invention relates to the technical field of lithium ion battery production, and especially relates to a power battery top cover. The power battery top cover comprises a top cover sheet, a first electrode unit and a second electrode unit. An overturning sheet connection hole and an insulation element containing part are arranged on the top cover sheet. The first electrode unit comprises an overturning sheet, a conductive sheet and a first insulation element. The overturning sheet connection hole is sealed by the overturning sheet. The conductive sheet is located under the overturning sheet. The first insulation element comprises a top cover sheet connection part and a conductive sheet connection part. The top cover sheet connection part stretches into the insulation element containing part and is fixed with the insulation element containing part. The conductive sheet is fixed on the top cover sheet by the conductive sheet connection part in an insulated mode. A power battery comprises the power battery top cover. According to the power battery top cover and the power battery provided by the invention, the conductive sheet can be effectively prevented from generating breakage and failure problems due to self displacement in normal assembly and use processes, and the occupied power battery internal space is relatively small.

Description

technical field [0001] The present application relates to the technical field of lithium-ion battery production, in particular to a power battery top cover and a power battery thereof. Background technique [0002] When the battery or module is overcharged, due to the decomposition of the electrolyte, excessive heat is generated inside the power battery or the internal pressure increases, and the battery will catch fire or explode. Therefore, before the battery goes out of control, it is hoped that there is a structure that can cut off the main circuit of the battery and prevent the battery from continuing to charge. [0003] Batteries in the related art generally have two modes of passive disconnection and active disconnection. Among them, the active circuit breaking method is generally to arrange a flip sheet and a conductive sheet at the bottom of the positive pole. During normal overcurrent, the current passes through the conductive sheet and the flip sheet, and then t...

AI Technical Summary

Problems solved by technology

The top of the conductive sheet is connected to the flip sheet, and the bottom is connected to the tab of the bare cell. If there are no other components to assist in fixing it, it will easily break and fail during normal assembly and use, or the conductive sheet will conduct with the flip sheet or the top cover sheet after deformation.

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