Battery cell and battery pack

By designing a first and second discharge zone in the cell casing and utilizing a grooved structure with different opening pressures, the risk of thermal runaway caused by electrolyte ejection from the explosion-proof valve was resolved. This enabled the smooth ejection of electrolyte and reduced the intensity of thermal runaway, thereby improving the safety of the cell and battery pack.

CN121983744BActive Publication Date: 2026-07-21SVOLT ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SVOLT ENERGY TECHNOLOGY CO LTD
Filing Date
2026-04-07
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

When the explosion-proof valve opens, it sprays out electrolyte, causing the pressure inside and outside the cell to rapidly approach each other, making it difficult to continue spraying electrolyte and increasing the risk of thermal runaway.

Method used

The battery cell casing is designed with a first discharge area and a second discharge area. The first discharge area is provided with a groove and a first notch, and the second discharge area is provided with a vent and a second notch. The opening pressure of the first notch is less than that of the second notch, ensuring that the first notch opens before the second notch, and gradually releases the electrolyte.

Benefits of technology

This extends the time when the internal pressure of the battery cell is higher than the external pressure, allowing more electrolyte to be ejected, reducing the intensity of thermal runaway reactions, and improving the safety performance of the battery cell and battery pack.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN121983744B_ABST
    Figure CN121983744B_ABST
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Abstract

The application relates to the technical field of batteries, in particular to a battery cell and a battery pack. The battery cell comprises: an outer shell with a first discharge area and a second discharge area, the first discharge area is provided with a groove to thin the thickness of the first discharge area, and the second discharge area is provided with an exhaust hole penetrating through the outer shell; a first notch is arranged in the first discharge area; the projection of the groove on a plane parallel to the first discharge area can cover the projection of the first notch on the plane parallel to the first discharge area; a pressure relief member is installed on the exhaust hole, and the pressure relief member is provided with a second notch; the area of a region surrounded by the first notch is S1, which is smaller than the area of a region surrounded by the second notch, S2; and the opening pressure of the first notch is smaller than that of the second notch. The first notch of the battery cell is opened first, which helps more electrolyte in the battery cell to be sprayed out, reduces the heat production source of the pole group in the battery cell, realizes the reduction of the intensity of the thermal runaway reaction of the battery cell, and improves the safety performance of the battery cell and the battery pack.
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