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 casing body and a plurality of pole core groups which are successively arranged and packaged in the metal casing body. The pole core groups are connected in series with one another. Each pole core group comprises at least one pole core. Each pole core group is packaged in a packaging film. The air pressure between the metal casing body and packaging films is lower than the air pressure outside the metal casing body. The air pressure in the packaging films is lower than theair pressure between the metal casing body and the packaging films. According to the invention, the sealing effect and the strength of the battery are improved.

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...

AI Technical Summary

Problems solved by technology

However, because the above method directly encapsulates the pole core and the electrolyte in the battery case, once the case is damaged, the electrolyte will easily leak, and the sealing effect is poor.

[0004] In addition, in order to increase the capacity of the battery, multiple pole cores are connected in series in the battery case. Under the condition of vibration and bumps, the multiple pole cores are easy to move in the case, and the relative displacement between the pole cores will occur. , causing damage to the pole core, for example, the current collector is damaged, the diaphragm is wrinkled, the active material layer on the pole piece falls off, the stability of the battery is poor, and safety problems are prone to occur

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