Secondary battery and battery module

Abstract

The application relates to the technical field of production of 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 component, a connector and a flip plate; the battery module comprises a first electrode plate, a second electrode plate, and a partition between the first electrode plate and the second electrode plate; at least one of the first and second terminals is electrically insulated to the top plate; normally, the first electrode plate is electrically connected to the first terminal through the flip plate, and the second electrode plate is electrically connected to the first electrode plate; when inner pressure of the secondary battery is higher than a reference pressure, the flip plate can flip such that the flip plate is electrically disconnected to the first electrode plate, and the flip plate flipped is electrically connected to a connector such that the first and second terminals are electrically connected. According to the application, even if a vehicle is running, sudden flameout never occurs and vehicle safety is improved.

Description

technical field [0001] The present application relates to the technical field of energy storage device production, and 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 solution generally adopted in the industry is to cut off the main circuit of the battery before the battery cell fails to prevent the battery from continuing to charge, so as to ensure the safety of the battery. The usual structure is: a current cut-off structure is provided 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 air pressure increases to a certain level. When the value is set, the current cut-off structure is activated to open the circuit between the first terminal and 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, The batteries in the battery module are connected in series. Because the first terminal and the second terminal are still in an insulated state, the entire battery module will be cut off, causing the car to suddenly turn off, and even lead to serious accidents.

Images