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Nickel-metal hydride battery shell electron beam welding method

An electron beam welding, hydrogen-nickel battery technology, applied in electron beam welding equipment, high-frequency current welding equipment, welding equipment and other directions, can solve the problems of welding deformation, high porosity, etc., achieve high welding yield, improve comprehensive mechanical performance, the effect of avoiding welding distortion problems

Active Publication Date: 2014-03-12
北方材料科学与工程研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the wall thickness of the battery case is only 0.4mm ~ 1.2mm, the heat input is easy to cause welding deformation when conventional electron beam welding is used, and the lack of high porosity

Method used

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  • Nickel-metal hydride battery shell electron beam welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1, a batch of 20 initial samples of type I battery casings were welded, and the penetration depth of the welds was 1.1 mm.

[0025] Preparations before welding: First, use clean white gauze dipped in acetone to clean the upper shell and the pole sleeve respectively. The cleanliness of the surface to be welded requires no oil film, water film and other organic impurities on the welded surface. It is also forbidden to touch and re-contaminate by hand. Once the workpiece is cleaned, it should be welded as soon as possible, and clean white gloves should be worn when cleaning. After cleaning, assemble the pole sleeve and the upper case. The assembly adopts special tooling fixtures, and the assembly gap is less than 0.05mm

[0026] A 60kV medium-voltage numerical control electron beam welding machine is adopted, and its main welding process parameters are as follows: acceleration voltage is 59.5kV, welding beam current is 3.5mA, surface focusing is selected, focusing ...

Embodiment 2

[0029] Example 2, a batch of 20 primary products of Type II battery shells were welded, and the penetration depth of the welds was 1.1 mm.

[0030] Preparation before welding refers to Example 1, using a 60kV medium-voltage numerical control electron beam welding machine, and its main welding process parameters are as follows: the acceleration voltage is 60.5kV, the welding beam current is 3.7mA, surface focusing is selected, the focusing current is 3.00A, and the welding speed It is 500mm / min, and the welding vacuum is 4.5×10-4mbar.

[0031] Appearance inspection and X-ray inspection are carried out on product welds, and the pass rate is 100%.

Embodiment 3

[0032] In Example 3, a batch of 20 initial products of Type II battery shells were welded, and the penetration depth of the welds was 1.1 mm.

[0033] Preparation before welding refers to Example 1, using a 60kV medium-voltage numerically controlled electron beam welding machine, and its main welding process parameters are as follows: the acceleration voltage is 60.0kV, the welding beam current is 3.9mA, surface focusing is selected, the focusing current is 2.98A, and the welding speed It is 500mm / min, and the welding vacuum is 4.5×10-4mbar.

[0034] Appearance inspection and X-ray inspection are carried out on product welds, and the pass rate is 100%.

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Abstract

A nickel-metal hydride battery shell electron beam welding method is characterized by including the following steps of firstly, preparation before welding, namely, an upper shell and a pole sleeve are cleaned respectively, oil films, water films and organic impurities on the welding surface are removed, the pole sleeve and the upper shell are assembled after being completely cleaned, and the assembling clearance is smaller than 0.05mm; secondly, the electron beam welding process, namely, in order to improve electron beam penetrating capacity and reduce porosity, vacuum welding is suitable for being adopted, and the welding vacuum degree is larger than 5*10<-4> mbar. By the adoption of vacuum electron beam welding, the welding defects of pores, concave parts and poor formed surfaces in the nickel-base superalloy electron beam welding process are effectively overcome, welding deformation is avoided, the comprehensive mechanical performance of a battery shell welding connector with the pole sleeve is improved, and nickel-base superalloy welding joints which meet the welding technical requirements of external quality, internal quality and the depth of fusion are acquired.

Description

technical field [0001] The invention relates to a welding method for a nickel-hydrogen battery casing and a pole sleeve. Background technique [0002] The nickel-hydrogen battery shell is an important part of the nickel-hydrogen battery in the space power system. As a pressure vessel part, it is made of nickel-based superalloy, and the wall thickness is generally 0.4mm to 1.2mm. Its basic structure includes an upper shell and a lower shell, and a plurality of pole sleeves made of nickel-based superalloy materials are welded on the upper shell. [0003] The nickel-hydrogen battery needs to have a certain pressure when it is working. The leakage of the shell will cause the loss of hydrogen and the drying up of the battery, and finally lead to the failure of the battery open circuit. Therefore, the nickel-hydrogen battery shell is required to withstand a certain burst pressure, which requires The welding seam after welding the upper casing and the pole sleeve has high welding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K13/06
CPCB23K15/0033B23K15/0053B23K15/06
Inventor 王英石磊杜乐一甄立玲程朝丰陈东亮马冰刘红伟罗建民
Owner 北方材料科学与工程研究院有限公司
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