Protection element and battery pack
The protective element with a laminated fusible conductor composed of low- and high-melting-point metals addresses the melting issues during reflow and abnormal conditions, providing reliable Pb-free safety for lithium-ion batteries.
JP2025186191APending Publication Date: 2025-12-23DEXERIALS CORP
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Patent Information
- Application Number
- JP2025093069
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-05-14
- Filing Date
- 2025-06-04
- Publication Date
- 2025-12-23
AI Technical Summary
Technical Problem
Existing protective elements for lithium-ion secondary batteries fail to prevent fusible conductors from melting during reflow processes and do not quickly melt in abnormal conditions, while also requiring lead-containing solder that is regulated and may be phased out.
Method used
A protective element comprising an insulating substrate, heating element, electrodes, and a fusible conductor made of a laminate with a low-melting-point metal layer and a high-melting-point metal layer, allowing for Pb-free materials and reliable fuse blowout during abnormal conditions.
Benefits of technology
The solution enables efficient reflow mounting and quick, reliable interruption of current paths using Pb-free materials, ensuring safety and compliance with environmental regulations.
✦ Generated by Eureka AI based on patent content.
Abstract
To provide a protection element in which a fusible conductor is not fused even through a reflow process, and the fusible conductor can be fused quickly when abnormal.SOLUTION: A protection element 1 includes an insulating substrate 2, a heating element 5, a first electrode 3 and a second electrode 4 laminated on the insulating substrate 2, a heating element extraction electrode 6 provided on a current path between the first and second electrodes 3 and 4 and electrically connected to the heating element 5, and a fusible conductor 7 mounted on the first electrode 3, the second electrode 4, and the heating element extraction electrode 6 and fused by a self-heating caused by heating or overcurrent of the heating element 5 to block the current path. The fusible conductor 7 is formed of a laminated body 13 including at least a low melting point metal layer 11 having a liquidus temperature of less than 260°C and a high melting point metal layer 10 having a liquidus temperature of more than 400°C, and the laminated body 13 has a material configuration in which a liquidus temperature of an alloy composition when melted as a single alloy is 300°C or more and 400°C or less.SELECTED DRAWING: Figure 1
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