Battery box and manufacturing method thereof

Abstract

The invention provides a battery box body and a manufacturing method thereof. The battery box body comprises a liquid cooling plate, the liquid cooling plate comprises a bottom plate and a front plug;a flow channel is formed in the bottom plate, flow channel grooves are formed in the front plug; a communication port communicated with the flow channel in the bottom plate is formed in the side surface of the flow channel groove; a plug block is arranged at the communicating port; the plug block is provided with an extending-in part and an extending-out part. The peripheral side surface of the extending part and the side surface of the liquid cooling plate are welded and fixed through arc welding to form a circle of plug block weld joint and seal the communication port; the left side plate and / or the right side plate are / is provided with receding grooves for receding the extending parts and the plug block weld joints, the thickness of the plug block weld joints in the up-down direction is larger than the height of a stirring head of friction stir welding, and the width of the plug block weld joints in the left-right direction is smaller than the width of the weld joints of friction stir welding. The battery box body has the beneficial effects that when the left side plate and / or the right side plate are / is welded through friction stir welding subsequently, the stirring head cannot completely damage a plug block weld joint, it is guaranteed that the sealing effect of the plug block weld joint on a communicating port is not damaged, and cooling liquid cannot leak.

Description

technical field [0001] The invention relates to a battery case and a manufacturing method thereof. Background technique [0002] In order to meet the lightweight requirements, the new energy industry currently adopts a wide range of design schemes for profile boxes. With the wide application of large batteries and fast charging, the problem of heat dissipation has become more and more prominent. At present, profile boxes with integrated liquid cooling functions have appeared on the market. [0003] Such as figure 1 Shown is a battery box in the prior art, including a liquid cooling plate at the bottom and a left side plate 4, a right side plate 5, a front side plate 2 and a rear side plate 3 fixed around the liquid cooling plate, wherein the liquid cooling plate The cold plate is an assembly, including a bottom plate 1 and a front plug 7 that are mated together. Such as image 3 As shown, the bottom plate 1 is provided with a flow channel 1-1 for the coolant to circulate...

AI Technical Summary

Problems solved by technology

At present, the communication port is blocked by using the left side plate 4 and the right side plate 5 when welding the left side plate 4 and the right side plate 5 to avoid liquid leakage, but this method relies on the side plate In fact, it is difficult to closely fit with the side of the liquid cold plate, so the seal is not reliable and liquid leakage is prone to occur

And it is required that the left side plate 4 and the right side plate 5 have higher surface quality, and the bottom plate 1 and the front plug 7 also need to have higher side quality, which not only increases the manufacturing difficulty, but also improves the manufacturing cost of the box body, and the welding more difficult

Images