Stable response method for power type lithium battery power-off protection and cap structure thereof

Abstract

The invention discloses a stable response method for power type lithium battery power-off protection. The method specifically includes: providing an O state aluminum material, and making a connectingsheet from the O state aluminum material, forming a center blind hole on the connecting sheet, and prefabricating a pull crack guide groove of certain shape for controlling the bottom rupture pull force and rupture position. The stable response method provided by the invention greatly improves the pressure relief uniformity of an anti-explosion disk, and the anti-explosion effect can be more stable and reliable. The power-off response pressure value can be realized by the material performance of the connecting sheet and the structure of the pull crack guide groove, and the response accuracy and stability performance are both improved significantly. The invention also discloses a cap structure. Compared with the prior art, the method and the structure provided by the invention solves the defect that in the past in order to ensure no heat emission of a connecting piece under large current, a welding part cannot disconnect timely to play a safety protection role. The structure constitutespower-off protection timely response of battery safety performance.

Description

technical field [0001] The invention relates to a power-off protection method for a power type lithium battery and a cap structure thereof. Background technique [0002] Power lithium batteries are usually used in combination of multiple cells in series and in parallel. In this way, the total energy of the battery is large, and there is a hidden danger of overcharging of the battery cells or the entire battery pack during the charging process. When the lithium battery is overcharged When the battery voltage increases rapidly with the increase of polarization, it will cause irreversible changes in the structure of the positive electrode active material and the decomposition of the electrolyte, a large amount of gas will be generated, and a large amount of heat will be released, resulting in a sharp increase in the temperature and internal pressure of the battery. Hazards such as burning. The safety of power lithium battery charging and discharging is related to factors such ...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a stable response method for power-off protection of a power-type lithium battery, which is used to solve the problem of untimely and unstable response of the protection action of the power-type lithium battery in terms of safety in use; it also provides a cap structure, a structure Reasonable, easy to implement, used to reduce manufacturing cost

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