Battery, battery module, battery pack and electric vehicle

Abstract

The invention provides a battery, a battery module, a battery pack and an electric vehicle. The battery comprises a metal shell and a plurality of pole core strings packaged in the metal shell; the plurality of pole core strings are arranged along a second direction and are connected in series; each pole core string comprises a plurality of pole core groups which are arranged along a first direction and are connected in series; each pole core group comprises at least one pole core; the pole core groups are packaged in a packaging film; the air pressure between the metal shell and the packaging film is lower than the air pressure outside the metal shell, and so that the sealing effect and the strength of the battery can be improved through the above mode.

Description

technical field

[0001] The invention belongs to the field of batteries, and in particular relates to a battery, a battery module, a battery pack and an electric vehicle. Background technique

[0002] A battery pack applied to an electric vehicle usually includes multiple batteries to increase battery capacity, and the multiple batteries are installed in the battery pack casing.

[0003] The battery needs to add electrolyte during the manufacturing process, so the battery needs to be sealed to prevent the electrolyte from leaking. In the prior art, generally, the pole core is directly sealed in the housing, and then the electrolyte is injected through the injection port on the housing, and after the electrolyte injection is completed, the injection port is sealed to obtain a battery. However, because the above method directly encapsulates the pole core and the electrolyte in the battery casing, once the casing is damaged, the electrolyte leakage is likely to occur, and the s...

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