Battery Current Collector Stiffness Zoning for Reliable Bonding
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Solution Overview
Problem
Variations in physical properties, such as stiffness, between current collection members and electrode collectors can lead to insufficient bonding during battery production, resulting in reliability issues.
Innovation Solution
Incorporating a first stiff portion and a second stiff portion with higher stiffness in at least one of the current collection member or the collector, and bonding them together to ensure secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the current collection member and electrode collector are bonded based on the same bonding conditions in mass production, then the production efficiency is maintained, but bonding failure occurs due to variations in physical properties such as stiffness
Solution Approach 1:
The current collection member is designed with a first stiff portion and a second stiff portion having different stiffness values. The second stiff portion (with higher stiffness) is specifically positioned at the bonding location to enhance bonding reliability, while the first stiff portion maintains overall structural integrity. This local differentiation allows consistent bonding conditions to achieve reliable bonding across all production units despite material variations.
Solution Approach 2:
The invention changes the stiffness parameter of the current collection member by creating portions with different stiffness values. The second stiff portion has a stiffness value specifically optimized for reliable bonding with the electrode collector, while the first stiff portion has a different stiffness value suited for structural support. This parameter differentiation ensures that bonding conditions remain effective across mass production.
2Adaptability or versatility
If the current collection member and electrode collector have large variations in physical properties, then material selection flexibility is maintained, but insufficient bonding occurs
Solution Approach 1:
By creating a local high-stiffness region (second stiff portion) at the bonding interface, the invention ensures consistent bonding quality even when the overall material properties of the current collection member vary. This local quality enhancement compensates for material variations without restricting material selection flexibility.
Solution Approach 2:
The invention modifies the stiffness parameter locally at the bonding portion while allowing the rest of the current collection member to maintain its original material properties. This selective parameter change enables manufacturers to use various materials with different overall physical properties while ensuring consistent bonding performance through the standardized second stiff portion design.
Data Source
AI summary
A battery is provided which includes a current collection member and an electrode collector which are sufficiently bonded to each other. A battery 1 includes a charge/discharge body 10 which includes, for example, a positive electrode 11 provided with a collector (for example, a positive electrode current collection foil 11S) and an active material, and a current collection member (for example, a positive electrode current collection plate 21) bonded to the positive electrode current collection foil 11S. The positive electrode current collection plate 21 includes a first stiff portion 21p having predetermined stiffness, and a second stiff portion 21q adjacent to the first stiff portion 21p and higher in stiffness than the first stiff portion 21p. The second stiff portion 21q included in the positive electrode current collection plate 21 and the positive electrode current collection foil 11S of the positive electrode 11 are bonded to each other.