Battery Cell Adapter Welding With Light-Absorbing Layer
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Solution Overview
Problem
Existing battery cell welding processes face challenges with insufficient connection strength due to laser reflection, leading to increased welding power and safety hazards from heat generation, which can cause other components to burn.
Innovation Solution
A battery cell design incorporating a light absorbing layer on the adapter member to reduce reflection, increase energy absorption, and lower welding power, while also improving the connection strength between the adapter member and the tab, using a chromium-containing material and specific recess structures to enhance the light absorbing properties and assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If laser welding is used to connect the adapter member and tab, then welding speed and automation are improved, but laser reflection causes insufficient connection strength and requires increased welding power
Solution Approach 1:
The adapter member surface is treated to change its optical properties from reflective to absorptive. This is achieved through surface blackening treatment or applying a black chromium plating layer, which changes the surface color/optical characteristic from bright metallic to dark, thereby increasing laser energy absorption and improving welding connection strength while maintaining automated laser welding process
Solution Approach 2:
The optical parameters of the adapter member surface are changed by modifying its surface properties. Through surface treatment processes such as blackening or coating with light-absorbing materials, the surface reflectivity parameter is reduced and absorptivity is increased, enabling effective laser energy coupling for strong welding connections
2Strength
If welding power is increased to compensate for laser reflection, then connection strength is improved, but heat generation increases causing other components to burn
Solution Approach 1:
By changing the surface color/optical properties of the adapter member to dark through blackening treatment or black chromium plating, the surface absorbs laser energy more efficiently. This allows welding to be performed at lower power levels, reducing heat generation and preventing damage to surrounding components while achieving sufficient connection strength
Solution Approach 2:
The原本有害的激光反射被转化为有用的激光吸收。通过改变适配器 member 表面光学特性，使原本反射激光的表面转变为吸收激光的表面，将有害的反射能量转化为有用的焊接热源，降低了焊接功率需求，减少了热量对周围组件的影响
3Use of energy by moving object
If the adapter member surface is treated to absorb light, then energy absorption rate is improved and welding power is reduced, but manufacturing complexity increases
Solution Approach 1:
The adapter member surface undergoes color change treatment (blackening) which can be integrated into existing surface treatment or plating processes. This approach modifies the optical properties without requiring separate complex manufacturing steps, as the blackening can be achieved through conventional surface treatment methods or combined with decorative plating processes
Solution Approach 2:
A composite structure is created by combining the base adapter member material with a light-absorbing surface layer (such as black chromium plating). This composite approach allows the bulk material to maintain its mechanical properties while the surface layer provides enhanced laser absorption, achieving both functional requirements without excessive manufacturing complexity
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 light absorbing layer effectively reduces the risk of laser irradiation, enhances energy utilization, and minimizes the risk of component burning, thereby improving the safety and efficiency of the battery cell assembly process.
Implementation Method 1
the light absorbing layer is applied to the adapter member to reduce reflection, increasing the energy absorption rate of the adapter member
Data Source
AI summary
A battery cell, a battery, and an electric apparatus are provided. The battery cell includes a housing, an electrode lead-out member, an electrode assembly, and an adapter member. The housing is provided with an accommodating cavity. The electrode lead-out member is disposed at the housing. The electrode assembly is accommodated in the accommodating cavity, where the electrode assembly includes a main body portion and a tab led out of the main body portion. The adapter member is configured to connect the tab and the electrode lead-out member, and a light absorbing layer is applied to a welding position of the adapter member. The light absorbing layer is applied to the surface of the adapter member to reduce reflection, increasing the energy absorption rate of the adapter member, and lowering the welding power, and reducing the possibility of other components of the battery cell being burned, thus improving the safety of the battery cell.