Lithium-ion battery spliced ​​layer unit frame and lithium-ion battery module composed of it

Abstract

The invention discloses a spliced ​​layer unit frame of a lithium ion battery and a lithium ion battery module composed of the lithium ion battery module. The lithium ion battery module includes a bottom plate, a top plate, and a plurality of layer units. Composed of batteries, elastic adjustment pads, and heat dissipation plates. The heat dissipation plate is punched with pits to form the accommodation space for the soft-pack lithium-ion battery and elastic adjustment pads. Lugs are extended at both ends of the heat dissipation plate, and through holes are provided on the lugs. The cooling plates are arranged in parallel in the spliced ​​layer unit frame, and the lugs set on each cooling plate are clamped between the upper frame and the lower end frame in the spliced ​​layer unit frame to form a layer unit, between the bottom plate and the top plate Multiple layer units are stacked between each other and positioned by bolt fastening. The module of the invention has compact structure, is convenient for maintenance, is easy to expand, realizes the isolation of battery cells, protects the battery, and has a significant effect on improving the service life and energy density of the lithium battery pack of the electric vehicle.

Description

technical field [0001] The invention belongs to a lithium ion battery module, in particular to a lithium ion battery spliced ​​layer unit frame and a lithium ion battery module composed thereof. Background technique [0002] Because lithium-ion batteries have higher energy density, the use of lithium-ion battery modules has become the technology of choice for pure electric vehicles and plug-in hybrid vehicles. [0003] At present, the lithium-ion battery module is modularly assembled with soft-packed lithium-ion batteries. Therefore, the use of soft-packed lithium-ion batteries for electric vehicles first requires the use of modular technology. By combining battery cells into suitable modules, they are assembled into battery boxes. . However, when the lithium-ion power battery is applied modularly in electric vehicles, due to the influence of factors such as connection method, consistency, and ambient temperature differences, the parameters such as specific energy and speci...

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of this scheme are the following two points: first, the cooling plate of the layer unit is a whole, and when more than two batteries in the layer unit are short-circuited with the cooling plate, a circuit is formed inside the layer unit, which affects the safety performance of the battery

Second, the horizontal expansion of the module lacks flexibility. The number of rectangular cavities in the frame is the same as the number of pits in the cooling plate, which is also the number of batteries arranged horizontally in the module layer. The entire module does not have the function of flexible expansion horizontally.

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