Square-hard-shell power battery module and preparation method thereof

Abstract

The invention is applicable to the technical field of power batteries and provides a square-hard-shell power battery module and a preparation method thereof. The battery module comprises a module box,a top surface positioning plate, square-hard-shell power cell groups and a washer, wherein the top surface positioning plate is detachably connected with the module box; a current collector is arranged on the top surface positioning plate; the square-hard-shell power cell groups are arranged inside the module box; the square-hard-shell power cell groups are arranged in lines or rows in a clampedmanner; two pole columns of square-hard-shell power cells of the square-hard-shell power cell groups are electrically connected with the current collector; the washer is arranged between the two square-hard-shell power cells; the washer is made of an elastic material. Due to adoption of the washers made of an elastic material between the square-hard-shell power cells, pressure of expanded pole columns to other square-hard-shell power cells is buffered in charge and discharge of the square-hard-shell power cells, or pressure caused by battery aging of expanded cells to other square-hard-shell power cells is buffered, the chemical property stability of the battery module is maintained, and the service life of the battery module is prolonged.

Description

technical field [0001] The invention belongs to the field of electric battery technology, and provides a square hard shell power battery module and a preparation method thereof. Background technique [0002] In recent years, the research and application of electric vehicles has attracted more and more attention. The chemical energy storage device of electric vehicles has chosen lithium-ion batteries with high energy density. Since a single lithium-ion battery cell cannot meet the energy and voltage requirements of electric vehicles, The energy storage device of electric vehicles is usually composed of multiple lithium-ion battery cells connected in series and parallel. In order to ensure the reliability and the convenience of processing and maintenance, the power battery is usually made into a battery module first, and the battery module is then assembled into a battery pack. [0003] The mainstream of power batteries are cylindrical, square hard shell and square soft shell...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a square hard-shell power battery module, which aims to solve the simple and close arrangement of cells in the existing square hard-shell power battery module. When the battery expands, the pressure on the module shell increases greatly, and the conductive to the inside of the cell, affecting the safety, life and performance of the battery

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