Cylindrical Battery Pole Connection Structure for Controlled Welding
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Solution Overview
Problem
Conventional large cylindrical battery welding technologies face challenges with limited space and difficulty in controlling welding energy, leading to suboptimal electrical connections between the pole and connecting piece, affecting the safety and reliability of the battery.
Innovation Solution
The cylindrical battery design includes a case with a through hole, a pole with a second through hole, a connecting piece with a protrusion that extends into the second through hole, and a sealing nail that hermetically fixes the protrusion, ensuring secure and sealed connections, facilitating better welding control and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque welding is used inside the battery core to connect the pole and connecting piece, then electrical connection is achieved, but the limited welding space makes welding operations inconvenient and difficult to control
Solution Approach 1:
The invention divides the welding operation into two distinct locations: the connecting piece is welded to the tab inside the battery core through the first through hole, while the pole is welded to the connecting piece outside the case through the second through hole. This segmentation allows each welding operation to be performed in an accessible location with adequate space, eliminating the difficulty of performing torque welding inside the confined battery core space.
Solution Approach 2:
The connecting piece serves as an intermediary component that bridges the tab and the pole. It is welded to the tab through the first through hole and to the pole through the second through hole, enabling electrical connection while allowing both welding operations to be performed in accessible locations outside the confined battery core space.
2Ease of operation
If penetration welding is used outside the case to connect the pole and connecting piece, then welding operation is accessible, but the large thickness of the pole makes it difficult to control welding energy and achieves poor welding effect
Solution Approach 1:
The welding connection is segmented into two separate welding locations: one at the first through hole where the connecting piece connects to the tab, and another at the second through hole where the pole connects to the connecting piece. This allows the welding operation to be performed at the thinner connecting piece rather than directly on the thick pole, improving welding energy control.
Solution Approach 2:
The connecting piece is designed with different local thickness characteristics: it has sufficient thickness to accommodate the tab connection at the first through hole, and provides an accessible welding surface at the second through hole for pole connection. This local quality variation enables both welding accessibility and welding energy control.
3Strength
If the pole is made thick to ensure structural strength, then mechanical strength is improved, but welding energy control becomes difficult and welding effect deteriorates
Solution Approach 1:
The structural function and welding function are segmented into different components: the thick pole provides structural strength, while the thinner connecting piece facilitates welding operations. The connecting piece is welded to both the tab and the pole, distributing the welding requirements across components with appropriate thickness characteristics.
Solution Approach 2:
The connecting piece acts as an intermediary between the thick pole and the tab, providing a welding surface with suitable thickness for energy control. This allows the pole to maintain its thick cross-section for structural strength while the connecting piece enables precise welding energy control at the second through hole.
Data Source
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AI summary
The disclosure discloses a cylindrical battery and an electronic device. The cylindrical battery includes a case (100), a pole (200), a connecting piece (300), and a sealing nail (400). The case (100) includes a cylindrical side wall and an end wall connected to the side wall, and a first through hole (101) is disposed on the end wall. The pole (200) includes a second through hole (204) and passes through the first through hole (101). The connecting piece (300) is disposed in the case (100) and includes a protrusion (301), the protrusion (301) extends into the second through hole (204), and the protrusion (301) is fixedly connected to the inner wall of the second through hole (204).