Battery Terminal Joining Structure to Suppress Spatter Adhesion
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Solution Overview
Problem
Existing methods for joining external conductive members and bus bars in secondary batteries are unstable, leading to spatter adhesion and potential deformation during the joining process.
Innovation Solution
A production method involving a cover member that covers the upper surface of the external conductive member around a through-hole, with a recess and a joint configuration that stabilizes the connection between the external conductive member and the terminal, using energy rays for joining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If external conductive members and terminals are joined through irradiation of energy rays, then joining is achieved, but spatter adheres to the upper surface of the external conductive member and deformation occurs
Solution Approach 1:
The recess is formed on the upper surface of the external conductive member before the joining process. This preliminary structural preparation creates a designated area that confines spatter and prevents deformation during subsequent energy ray irradiation, thereby protecting the surrounding upper surface from harmful effects.
Solution Approach 2:
The recess captures and contains the spatter that is generated during the energy ray joining process, converting the harmful spatter into a contained feature within the recess rather than allowing it to adhere to the surrounding upper surface. This transforms a detrimental effect into a localized phenomenon that does not compromise the overall integrity of the external conductive member.
2Ease of manufacture
If the upper surface of the external conductive member is exposed during joining, then joining can be performed, but spatter adheres to the surface causing instability
Solution Approach 1:
The recess is prepared in advance on the upper surface before joining occurs. This pre-formed structure guides the spatter into a specific area during the joining process, ensuring that the surrounding surface remains clean and that the joining operation can proceed without compromising reliability due to spatter adhesion.
3Strength
If energy rays are used for joining external conductive members and terminals, then joining is achieved, but heat is generated during energization
Solution Approach 1:
The recess is formed before the joining and energization processes. This pre-existing structural feature helps manage heat distribution during energization by providing a localized area that can accommodate thermal effects, thereby reducing overall heat generation and improving thermal management of the connection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method suppresses spatter adhesion and enhances the stability of the joining process, ensuring a more secure connection between the external conductive member and the bus bar, while also preventing deformation and heat generation during energization.
Implementation Method 1
covering at least part of an upper surface of the external conductive member with a cover member
Implementation Method 2
joining the external conductive member and the terminal through irradiation of energy rays
Data Source
AI summary
Provided is art that allows joining an external conductive member and a bus bar more stably. A method for producing a secondary battery disclosed herein has: an attachment step; an arrangement step; a covering step; and, a joining step. The external conductive member has a recess sunk from the upper surface, around a through-hole. In the joining step, the external conductive member and the terminal are joined in a state where an edge portion of a cover member is disposed between a planned joint portion, and an outer peripheral edge of the recess, in a cross-sectional view along a direction of penetration into the through-hole.