Electrode Tab Hardness Layer for Vibration-Resistant Battery Units
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Solution Overview
Problem
Batteries, such as lithium ion batteries, face issues with reduced service life and safety due to vibration, which can cause deformation and breakage of electrode assembly components, leading to performance failure.
Innovation Solution
A battery unit with an electrode assembly featuring a hardness increasing layer on the uncoated region of the electrode plate, with an elasticity modulus greater than 6 GPa, to enhance the rigidity and resistance to deformation, thereby preventing breakage and prolonging the service life and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the uncoated region is made thinner to reduce overall battery size, then the battery compactness is improved, but the uncoated region becomes more prone to deformation and breakage under vibration
Solution Approach 1:
The patent applies a hardness increasing layer specifically to the uncoated region of the electrode plate, creating a localized reinforcement. This allows the uncoated region to have enhanced rigidity and resistance to deformation exactly where needed (at the connection area), while the rest of the electrode structure maintains its original thin design for compactness. The local application of the hardness increasing layer resolves the contradiction by providing strength only where structurally necessary.
Solution Approach 2:
The patent creates a composite structure by combining the base electrode plate material with a hardness increasing layer applied to the uncoated region. This composite construction integrates two materials with different properties: the base material provides conductivity and flexibility, while the hardness increasing layer provides enhanced rigidity and vibration resistance. This composite approach allows the thin uncoated region to achieve the necessary strength without increasing overall thickness.
2Reliability
If the uncoated region is reinforced to prevent breakage during vibration, then the safety and service life are improved, but the manufacturing complexity increases
Solution Approach 1:
The hardness increasing layer is applied to the uncoated region during the electrode plate manufacturing process, before the electrode plate is assembled into the battery. This preliminary reinforcement ensures that the uncoated region is pre-strengthened to withstand vibration stresses before it is installed in the battery assembly. By performing the reinforcement action during manufacturing rather than during battery assembly or operation, the process becomes more integrated and less complex.
3Strength
If the hardness increasing layer thickness is increased to improve vibration resistance, then the uncoated region rigidity is improved, but the overall electrode assembly size increases
Solution Approach 1:
The hardness increasing layer is applied only to the uncoated region of the electrode plate, not to the entire electrode structure. This localized application ensures that the reinforcement is concentrated exactly where it is needed (at the connection area subject to vibration stress) without adding unnecessary material thickness to the active electrode regions. This resolves the contradiction by providing maximum rigidity enhancement with minimum increase in overall electrode assembly dimensions.
Data Source
AI summary
Provided are a battery unit, and a battery, a power consuming device and a preparation apparatus associated therewith. The battery unit comprises: an electrode assembly comprising two electrode plates that have opposite polarities, a coated region and an uncoated region connected to each other being formed on the electrode plate, the coated region being coated with an active material layer, and the uncoated region being used for connecting to an electrode terminal of the battery unit; wherein a surface of the uncoated region is provided with a hardness increasing layer, and the hardness increasing layer has an elasticity modulus greater than 6 Gpa. By providing the hardness increasing layer on the surface of the uncoated region, the battery unit of the embodiments of the present application can alleviate the problem of battery safety caused by vibration during the use of the battery and prolong the service life of the battery.