Battery three-dimensional interlayer diaphragm structure with graded liquid retention capacity

Abstract

The invention discloses a battery three-dimensional interlayer diaphragm structure with graded liquid retention capacity. The battery three-dimensional interlayer diaphragm structure comprises a frontsurface layer base film (11) and a rear surface layer base film (12) which are distributed at intervals front and back, wherein a plurality of transversely distributed liquid storage interlayers (2)are arranged in a cavity between the front surface layer base film (11) and the rear surface layer base film (12) at intervals from top to bottom, the liquid storage interlayers (2) are used for dividing the cavity between the front surface layer base film (11) and the rear surface layer base film (12) into a plurality of independent liquid storage channels, each liquid storage interlayer (2) comprises a plurality of interlayer single bodies (4) which are sequentially connected together, each interlayer single body is of a groove structure with an upward opening, and an intercommunicating hole(3) which is vertically through up and down is formed in the joint of any two adjacent interlayer single bodies. The battery three-dimensional interlayer diaphragm structure is scientific in structural design, and controllably achieves the graded storage of an electrolytic solution at different height levels, so that the problems of battery safety and electrical performance caused by lack of electrolytic solution are prevented.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery three-dimensional sandwich diaphragm structure with graded liquid retention capacity. Background technique [0002] As the main force of the current green energy development, the battery's electrical performance and safety are the focus of people's attention. As the main component of the battery, the separator plays a pivotal role in the battery. [0003] At present, the arrangement of batteries in the battery pack (PACK) is mainly vertical placement, which will inevitably cause the electrolyte to partially settle at the bottom of the battery due to gravity. However, when the electrolyte needs to be activated, it often takes a certain amount of time to transfer the electrolyte from the bottom to the upper part, so there will be a concentration difference, which seriously affects the rate performance of the battery. At the same time, when the battery electrode group ...

AI Technical Summary

Problems solved by technology

[0003] At present, the arrangement of batteries in the battery pack (PACK) is mainly vertical placement. This placement will inevitably cause the electrolyte to partially accumulate at the bottom of the battery due to gravity.

When the electrolyte needs to be activated, it often takes a certain amount of time to transfer the electrolyte from the bottom to the upper part, so there will be a concentration difference, which seriously affects the rate performance of the battery.

At the same time, when the battery electrode group is wound, due to the different tension, the tension in some positions increases, and the corresponding part of the electrolyte volume will decrease. As a result, in the process of charging and discharging, lithium precipitation or dead zone will be caused due to lack of electrolyte, which will seriously affect the battery life. Battery safety performance

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