A battery, a battery module, a battery pack and an electric vehicle

Abstract

The present application provides a battery, a battery module, a battery pack and an electric vehicle. The battery includes a casing, an end cover, a separator and a plurality of pole core groups. The end caps are arranged at opposite ends of the housing to close the inner space of the housing. The partitions are arranged at intervals in the casing to separate a plurality of accommodating cavities sequentially arranged along the first direction in the inner space of the casing. Each containing cavity is provided with the pole core group, the pole core group includes at least one pole core, and a plurality of pole core groups are arranged in sequence along the first direction and connected in series. A liquid injection channel is opened on the separator, and the liquid injection channel communicates with the accommodation chamber on at least one side of the separator, and is used for injecting the electrolyte solution from the outside of the battery into the accommodation chamber. The liquid injection channel is in a closed state after the liquid injection is completed, so as to isolate the communication between the accommodation cavity and the outside of the battery. The housing is provided with a through hole at a position corresponding to the liquid injection channel on the separator for communicating the liquid injection channel with the outside of the battery. The battery of the present application has higher battery capacity and voltage, and can effectively solve the problem of liquid injection of the battery.

Description

technical field [0001] The present application belongs to the battery field, and in particular relates to a battery, a battery module, a battery pack and an electric vehicle. Background technique [0002] With the continuous popularization of new energy vehicles, the requirements for the use of power batteries in new energy vehicles are becoming higher and higher. In particular, as users continue to increase the mileage requirements of new energy vehicles, the overall capacity of power battery packs used in new energy vehicles needs to be continuously increased; at the same time, during the use of power battery packs, due to internal resistance, The internal friction is required to be minimized. [0003] Generally speaking, there is only one bare cell or multiple parallel-connected bare cells in the battery casing, and the voltage of the entire battery cannot be increased by including a single bare cell or multiple parallel-connected cells. For example, the voltage of lith...

AI Technical Summary

Problems solved by technology

[0006] Since multiple pole core groups are connected side by side, the internal potential difference of the battery is relatively high. If multiple pole groups connected in series share the electrolyte in the same chamber, the electrolyte is likely to decompose due to the high potential difference, resulting in battery failure.

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