Fixing method of upper shell and lower shell of power battery pack

Abstract

The invention provides a method for fixing an upper shell and a lower shell of a power battery pack. The method comprises following steps: step 1, preparing a gluing tool; step 2, brushing primer on to-be-bonded surfaces of the upper shell and the lower shell; step 3, applying sealing glue to the to-be-bonded surfaces of the upper shell and the lower shell; step 4, pressing the upper shell and thelower shell, and then tightening screws; step 5, uniformly smearing sealant; and step 6, placing and maintaining the fixed battery pack, and carrying out air-tightness detection after the sealant iscured. According to the method, the invest cost is low, a rubber pipe is prevented from being blocked, and a rubber tank and the rubber pipe do not need to be cleaned; besides, the air-tightness of the battery pack after the upper and lower shells are fixed is ensured, and the one-time passing rate of air-tightness detection of the battery pack is improved.

Description

technical field [0001] The purpose of the present invention is to provide a casing fixing method, especially a method for fixing the upper and lower casings of a power battery pack. Background technique [0002] With the popularization of electric vehicles, the demand for power batteries is also increasing. As a high-energy carrier, the reliability, stability and safety of power batteries largely determine the safety and reliability of the vehicle. Therefore, It is generally required that the sealing protection level of the power battery pack casing reaches IP67 level, that is, the casing should be placed under 1 meter deep water for 30 minutes, and no water should enter the inside of the casing. [0003] It is one of the important ways to fix the upper and lower shells of the battery pack after applying glue to the whole package of the upper and lower shells. At this stage, there are two kinds of gluing processes on the market; The gluing process has the following problems...

AI Technical Summary

Problems solved by technology

[0003] It is one of the important ways to fix the upper and lower shells of the battery pack after applying glue to the whole package of the upper and lower shells. At this stage, there are two kinds of gluing processes on the market; The gluing process has the following problems: (1) The input cost of the robot is relatively large, which is only suitable for mass production; (2) There is a long rubber hose between the glue bucket and the robot glue gun, and the residual glue in the rubber hose needs to be drained before each production. Empty, due to the timeliness of the glue, if it stands for a long time, it may cause the hose to be blocked, and the glue tank and hose need to be cleaned; (3) When the glue is abnormal (such as air mixed in the glue, the quality of the glue is poor, the hardness / viscosity is abnormal etc.), it is impossible to detect and stop the operation at the first time; once the abnormal glue is applied and the cover is closed, the repair cost is very high

[0004] The other is the manual gluing process, but there is no standard for this process in the market, and there are no specific requirements for tools, auxiliary materials, operation methods, etc., and it is relatively random; the one-time pass rate of the manual gluing process on the market at this stage is low

[0005] The existing patent CN203941956U discloses a sealing structure of a battery box. Although a reliable sealing and wide versatility fixing structure for the upper and lower casings of the battery pack is provided, no specific method for fixing the upper and lower casings has been studied, especially The gluing process involved in the fixing of the upper and lower shells, and the maturity and standardization of the gluing process will greatly affect the quality of the final battery pack after the upper and lower shells are fixed; the existing patent CN108790194A discloses a battery pack shell and cover The FDS riveting process of the board mainly describes the riveting process, but it does not standardize the process of gluing. The riveting method can improve the tightness of the connection between the battery pack shell and the cover plate, but the gluing process and the performance of the colloid also have problems. Will affect the airtightness of the whole package