Battery pack

Abstract

The invention relates to a battery pack, which comprises a battery box and a battery module, wherein the battery box includes a box body, a box cover and a heat dissipation assembly; the box body includes two first side walls which are opposite and parallel to each other and arranged in a spaced manner, two second side walls which are vertically connected between the two first side walls and opposite and parallel to each other and a bottom plate which is vertically connected with the two first side walls and the two second side walls; the bottom plate divides the box body into a first accommodating space and a second accommodating space; one first side wall is provided with an air inlet communicated with the second accommodating space, and the other first side wall is provided with an air outlet communicated with the second accommodating space; the heat dissipation assembly includes a sealing plate and a plurality of heat dissipation fins which are opposite and parallel to each other and arranged on the sealing plate at intervals; four edges of the sealing plate are respectively abutted against the edges of the two first side walls and the two second side walls, and the plurality of heat dissipation fins are enabled to be located in the second accommodating space and respectively abutted against the sealing plate and the bottom plate. The battery pack provided by the invention improves the IP level.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery pack. Background technique [0002] Lithium-ion batteries are highly sensitive to temperature, and their charge and discharge capacity, cycle life, and safety are directly affected by temperature. When the working environment temperature of the lithium-ion battery is high, the chemical activity of the battery material increases, which leads to a certain increase in the discharge capacity of the battery, but at the same time it also leads to an accelerated aging of the battery material, serious polarization of the battery, and repeated use. The lifespan decays rapidly, and if the temperature is too high, the battery may even spontaneously ignite, endangering the safety of the vehicle and its occupants. [0003] The existing battery pack heat dissipation method usually opens vents on the wall of the battery pack or battery box, and a fan is installed in the battery box...

AI Technical Summary

Problems solved by technology

When the working environment temperature of the lithium-ion battery is high, the chemical activity of the battery material increases, which leads to a certain increase in the discharge capacity of the battery, but at the same time it also leads to an accelerated aging of the battery material, serious polarization of the battery, and repeated use. The lifespan decays rapidly, and if the temperature is too high, the battery may even spontaneously ignite, endangering the safety of the vehicle and its occupants

[0003] The existing battery pack heat dissipation method usually opens vents on the battery pack or battery box wall, and a fan is installed in the battery box to dissipate heat from the battery module. However, this method will reduce the IP (Ingress Protection, protection) level of the battery pack.

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