Square battery shell, battery adopting same, battery pack and automobile

Abstract

The invention relates to a square battery shell, a square battery adopting the same, a battery pack and an automobile. The square battery shell is characterized in that a flat sealing cavity is formed in at least one shell surface of the square battery shell, no interface thermal resistance exists between at least one cavity wall of the sealing cavity and the shell connected with the cavity wall, a liquid absorption core is arranged in the sealing cavity, and the sealing cavity is vacuum and is filled with a phase change heat transfer working medium. The sealing cavity enables any local heat on the shell surface where the sealing cavity is located to be quickly and uniformly dispersed to the periphery, and heat exchange of quick heat dissipation and quick heat absorption with the external environment can be carried out only by contacting the surface of the sealing cavity, any area of the shell surface where the sealing cavity is located or an adjacent area with the external environment, thus the technical problems that the energy density of the battery pack is obviously reduced, the assembly cost is increased and the reliability is reduced due to the fact that a refrigerant pipeline needs to be arranged on the battery shell and the battery shell is connected with an external refrigerant system through a connector in order to achieve rapid heat management of the battery in the battery pack composed of batteries manufactured through an existing battery shell are solved.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing for power and energy storage and battery heat management, in particular to a square battery shell, a square battery using the shell, a battery pack and an automobile. Background technique [0002] Power batteries and energy storage batteries are extremely important emerging application fields of lithium-ion batteries. The development direction of these two important application fields is high energy density, fast charging, and fast discharging. High energy density means that the same volume or weight can store more electric energy, and for electric vehicles, it means higher mileage; fast charging means that the power battery can be charged in a shorter time; With electric vehicles, especially electric heavy-duty trucks and electric ships having better acceleration performance, energy storage power stations have better peak-shaving and frequency-regulating capabilities. [0003] Due ...

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Problems solved by technology

[0005] The invention provides a square battery casing to solve the problem of battery packs made of batteries made of existing battery casings. In order to realize rapid thermal management of the batteries, it is necessary to set refrigerant pipelines on the battery casing and communicate with the external refrigerant system through joints. The energy density of the battery pack brought about by the connection is significantly reduced, the assembly cost is increased, and the technical problems of reduced reliability

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