Secondary battery and battery module

Abstract

The invention relates to the technical field of production of energy storage devices and particularly relates to a secondary battery and a battery module. The secondary battery comprises a first terminal assembly, a second terminal assembly and a top cover plate, wherein the first terminal assembly comprises a first terminal, a conductive part and a first overturning plate; the first overturning plate is arranged on the first terminal; the first terminal is electrically connected with the top cover plate through the conductive part all the time; the second terminal assembly comprises a second terminal, a second overturning plate and a connection part; the second terminal is electrically insulated from the top cover plate; the connection part is electrically connected with the second terminal; the second overturning plate is arranged on the top cover plate. Through the secondary battery, batteries in the battery module are connected with each other in series; the secondary battery can also be used as a conductor for still keeping the whole battery module in on-state when the overcharging problem occurs, so that vehicles in running state cannot halt accidently; the safety of the vehicles is improved; meanwhile, for the secondary battery, fusing devices do not need to be added in a main circuit, so that the overcharging problem of the secondary battery can be solved.

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, prevent the battery from continuing to charge, and ensure battery safety, the industry generally adopts the following two solutions: [0003] In the first solution, a flipping piece is installed 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 top cover piece and the flipping piece. When the battery is overcharged, internal gas is generated, and the internal air pressure increases. When a certain value is reached, the reversing piece is reversed, so that the circuit between the first terminal and the electrode assembly is disconnected, preventing the battery from continuing to be charged....

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the first solution alone, that is, the solution of setting the flipper in the main circuit, cannot solve the power-off problem of the car after the flipper flips when the batteries are connected in series; and the second solution alone, that is, the first terminal If a flip piece is set between the second terminal and the second terminal, the problem of overcharging cannot be solved

Therefore, it is necessary to propose a new technical solution to solve the overcharge problem of the battery, and at the same time solve the power failure problem of the car after the flip sheet is turned over when the batteries are connected in series.

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