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 groups which are packaged in the metal shell and are sequentially arranged; the pole core groups are connected in series, and each pole core group comprises at least one pole core; the pole core groups are packaged in a packaging film; and the air pressure between the metal shell and the packaging film is lower than the air pressure outside the metal shell. The air pressure in the packaging film is lower than the air pressure between the metal shell and the packaging film, so that the sealing effect and the strength of the battery are improved.

Description

Technical Field

[0001] This invention belongs to the field of batteries, and particularly relates to a battery, a battery module, a battery pack, and an electric vehicle. Background Technology

[0002] Battery packs used in electric vehicles typically include multiple batteries to increase battery capacity; these batteries are installed inside the battery pack casing.

[0003] Batteries require the addition of electrolyte during manufacturing, necessitating sealing to prevent leakage. Current technology typically involves directly sealing the electrode core within the casing, then injecting the electrolyte through an inlet on the casing. After injection, the inlet is sealed to obtain the battery. However, this method, by directly encapsulating the electrode core and electrolyte within the battery casing, makes it susceptible to leakage if the casing is damaged, resulting in poor sealing.

[0004] In addition, to increase battery capacity, multiple electrode cores are connect...