Secondary battery and battery module

Abstract

The application relates to the field of technologies for producing energy storage devices, in particular to a secondary battery and a battery module. The secondary battery comprises a first terminal, a second terminal, a top cover plate, an electrode assembly, a first turnover plate and a second turnover plate. At least one of the first terminal and the second terminal is electrically insulated from the top cover plate, the first turnover plate is attached to the first terminal, and the second turnover plate is attached to the second terminal; when in normal states, a first pole piece is electrically connected with the first terminal by the first turnover plate, and a second pole piece is electrically connected with the second terminal by the second turnover plate; when the internal pressures of the secondary battery exceed the reference pressures, the first turnover plate and the second turnover plate can turned over, so that the first terminal can be electrically connected with the second terminal and can be electrically disconnected from the first pole piece by the first turnover plate, and / or the second terminal can be electrically disconnected from the second pole piece by the second turnover plate. The secondary battery and the battery module have the advantages that an automobile can be prevented from suddenly stalling even if the automobile is in a running state, and accordingly the safety of the automobile can be improved.

Description

technical field [0001] The present application relates to the technical field of production of energy storage devices, in particular to a secondary battery and a battery module. Background technique [0002] For EV hard-shell batteries, in order to solve the overcharge problem, the industry generally adopts a solution to cut off the main circuit of the battery before the battery fails to prevent the battery from continuing to charge to ensure battery safety. The usual structure is: a current cut-off structure is set in the main circuit where the first terminal is electrically connected to the electrode assembly, and the second terminal is always electrically insulated from the current cut-off structure. When the battery is overcharged, internal gas is generated, and the internal pressure increases to a certain level. When the value is high, the current cut-off structure is activated to disconnect the circuit between the first terminal and the electrode assembly, preventing t...

AI Technical Summary

Problems solved by technology

[0003] However, in addition to overcharging, during normal use, an accidental internal short circuit may also cause internal gas production, activate the current cut-off structure, and form an open circuit between the first terminal and the electrode assembly. If the car is running at this time, However, the secondary batteries in the battery module are connected in series. Since the first terminal and the second terminal are still in a state of electrical insulation, the entire battery module will be powered off, causing the car to suddenly turn off, and even lead to serious accidents.

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